Liquid detection device

Abstract

The utility model discloses a liquid detection device, which comprises a liquid container for defining a cavity for accommodating liquid to be detected, the liquid container comprises a liquid inlet and a liquid outlet which are communicated with the cavity, the liquid inlet is used for connecting an upstream pipeline, and the liquid outlet is used for connecting a downstream pipeline; the detection part extends into the cavity; the first valve is arranged at the liquid inlet; the second valve is arranged at the liquid outlet; one of the pressure states in the cavity is a negative pressure state, a normal pressure state or a positive pressure state; in a negative pressure state, the first valve opens the liquid inlet, and the second valve closes the liquid outlet, so that to-be-detected liquid is introduced into the cavity; in the normal pressure state, the first valve closes the liquid inlet, the second valve closes the liquid outlet, so that the liquid to be detected is kept in the cavity, and the detection component is triggered in the normal pressure state; in the positive pressure state, the first valve closes the liquid inlet, and the second valve opens the liquid outlet, so that the liquid to be detected is discharged out of the cavity. The liquid detection device disclosed by the utility model can realize efficient and accurate liquid detection.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid detection technical field, especially a kind of liquid detection device. BACKGROUND

[0002] In the field of liquid detection technology, the commonly used liquid detection devices are mostly applied in laboratory, industrial production and other scenes, for monitoring the flow, composition or physical properties of liquid. These devices usually detect specific parameters of liquid through flow meters, concentration meters and other equipment, and are widely used in beverage manufacturing, chemical experiments and water quality monitoring fields. Especially in the food and beverage industry, accurate detection of liquid is related to the quality and taste of products. For example, in the manufacturing of coffee drinks, different types of coffee have different requirements for the concentration and composition of extraction liquid, which requires detection of parameters such as the concentration of extraction liquid.

[0003] However, the current liquid detection devices have some significant defects. The existing detection devices generally rely on external manual operation / control, making it difficult to achieve accurate liquid collection and detection, and the operation is cumbersome and prone to errors, resulting in inaccurate detection results. SUMMARY

[0004] The utility model aims at providing a kind of liquid detection device with convenient use, high detection precision and low cost.

[0005] To achieve the above utility model purposes, the utility model provides a kind of liquid detection device, comprising:

[0006] A liquid container defines a cavity for containing a liquid to be detected, the liquid container includes a liquid inlet and a liquid outlet communicating with the cavity, the liquid inlet is used to connect the upstream pipeline, and the liquid outlet is used to connect the downstream pipeline;

[0007] A detection component extends into the cavity;

[0008] A first valve is arranged at the liquid inlet;

[0009] A second valve is arranged at the liquid outlet;

[0010] The pressure state in the cavity is alternatively negative pressure state, normal pressure state or positive pressure state; in the negative pressure state, the first valve opens the liquid inlet, and the second valve closes the liquid outlet to introduce the liquid to be detected into the cavity; in the normal pressure state, the first valve closes the liquid inlet, and the second valve closes the liquid outlet to keep the liquid to be detected in the cavity, and the detection component is triggered in the normal pressure state; in the positive pressure state, the first valve closes the liquid inlet, and the second valve opens the liquid outlet to discharge the liquid to be detected from the cavity.

[0011] Compared with the prior art, the utility model discloses the beneficial effect lies in: through the combination of liquid container, detection component and valve, the inflow, keep and outflow of the liquid to be detected under different pressure states can be controlled, and the efficient and accurate liquid detection process can be realized. The negative pressure state is used for introducing the liquid, the normal pressure state is used for triggering detection, and the positive pressure state is used for discharging the liquid. The whole process of pumping, detection and liquid discharge can be automatically carried out, so that the whole operation process is automated and efficient, and is suitable for various liquid detection scenes. Detection is carried out under the blocking of the cavity and the upstream pipeline and the downstream pipeline, and the stability and precision of detection are improved.

[0012] As a further improvement of an embodiment of the utility model, still include pressure regulating device, the cavity has the vent, the pressure regulating device passes through the vent and communicates the cavity, and the vent is arranged between the liquid inlet and the liquid outlet. The pressure regulating device can be operated to make the pressure state in the cavity be the negative pressure state or the positive pressure state.

[0013] As a further improvement of an embodiment of the utility model, the pressure regulating device is configured as a peristaltic pump. The peristaltic pump moves in a first direction, and the pressure state in the cavity is the negative pressure state. The peristaltic pump moves in a second direction, and the pressure state in the cavity is the positive pressure state. The first direction and the second direction are opposite to each other.

[0014] As a further improvement of an embodiment of the utility model, along the gravity direction, the liquid inlet is located above the liquid outlet, the vent is arranged near the liquid inlet, and the detection component is arranged near the liquid outlet. The highest liquid level of the liquid to be detected in the cavity is lower than the vent.

[0015] As a further improvement of an embodiment of the utility model, the first valve is configured as a first one-way valve, and the second valve is configured as a second one-way valve. The first one-way valve opens when the pressure state in the cavity is the negative pressure state, and the second one-way valve opens when the pressure state in the cavity is the positive pressure state.

[0016] As a further improvement of an embodiment of the utility model, the first one-way valve is configured as a first duckbill valve, and the second one-way valve is configured as a second duckbill valve. The first duckbill valve automatically opens when the pressure state in the cavity is the negative pressure state. The second duckbill valve automatically opens when the pressure state in the cavity is the positive pressure state.

[0017] As a further improvement of one embodiment of the present application, the first valve is configured as a first electromagnetic valve, and the second valve is configured as a second electromagnetic valve; the first electromagnetic valve is controlled to open when the pressure state in the cavity is the negative pressure state; and the second electromagnetic valve is controlled to open when the pressure state in the cavity is the positive pressure state.

[0018] As a further improvement of one embodiment of the present application, a drainage groove is arranged in the cavity, the drainage groove has a first end close to the liquid inlet, the first end is arranged in the liquid inlet direction, and the drainage groove guides the to-be-detected liquid flowing in through the liquid inlet.

[0019] As a further improvement of one embodiment of the present application, the cavity includes a contraction region close to the liquid outlet, the detection component extends into the contraction region, the drainage groove extends to the contraction region in an inclined manner, and the to-be-detected liquid enters the contraction region through the drainage groove.

[0020] As a further improvement of one embodiment of the present application, the liquid container is provided with a mounting passage communicating with the cavity, the detection part of the detection component extends into the cavity through the mounting passage, and the detection component is fixedly connected with the mounting passage through the fixing member. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic view of a liquid detection device according to one embodiment of the present application.

[0022] Figure 2 is Figure 1 is a sectional view of the liquid detection device in

[0023] Figure 3 is a sectional view along the line A-A in Figure 2

[0024] Figure 4 is Figure 1 is an exploded view of the liquid detection device in

[0025] Figure 5 is Figure 1 is a schematic view of another structural form of the liquid container of the liquid detection device in

[0026] Figure 6 is Figure 5 is an exploded view of the liquid detection device in DETAILED DESCRIPTION

[0027] ​The utility model will be described in detail below with reference to the specific embodiments shown in the drawings. However, these embodiments do not limit the utility model, and the changes in structure, method or function made by those skilled in the art based on these embodiments are all included in the protection scope of the utility model.

[0028] It should be understood that the terms for spatial relative position used herein, such as "upper", "above", "lower", "below", etc. are used for the purpose of convenient description to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings. The terms for spatial relative position can be intended to include different positions of the device in use or work other than the positions shown in the drawings.

[0029] The liquid detection device 100 in the specific embodiment of the utility model, refer to Figures 1 to 4 As shown, the liquid detection device 100 includes a liquid container 20 and a detection component 30, and the liquid container 20 defines a cavity 201 for containing a liquid to be detected. The liquid container 20 includes a liquid inlet 21 and a liquid outlet 22 communicating with the cavity 201, the liquid inlet 21 is used for connecting an upstream pipeline, the liquid outlet 22 is used for connecting a downstream pipeline, and the detection component 30 extends into the cavity 201.

[0030] The liquid detection device 100 further includes a first valve 41 and a second valve 42, the first valve 41 is arranged at the liquid inlet 21, and the second valve 42 is arranged at the liquid outlet 22. The cavity 201 communicates with the upstream pipeline through the liquid inlet 21 and communicates with the downstream pipeline through the liquid outlet 22. The liquid inlet 21 controls the inflow of the liquid to be detected through the first valve 41, and the liquid outlet 22 controls the outflow of the liquid to be detected through the second valve 42, and the design of the liquid container 20 can ensure that the liquid to be detected reliably flows into the cavity 201 and provides a stable environment for the detection of the liquid to be detected.

[0031] Among them, the pressure state in the cavity 201 is alternatively negative pressure state, normal pressure state or positive pressure state; in the negative pressure state, the first valve 41 opens the liquid inlet 21, and the second valve 42 closes the liquid outlet 22, so as to introduce the liquid to be detected into the cavity 201; in the normal pressure state, the first valve 41 closes the liquid inlet 21, and the second valve 42 closes the liquid outlet 22, so as to keep the liquid to be detected in the cavity 201, and the detection component 30 is triggered in the normal pressure state; in the positive pressure state, the first valve 41 closes the liquid inlet 21, and the second valve 42 opens the liquid outlet 22, so as to discharge the liquid to be detected from the cavity 201.

[0032] The combination of the liquid container 20, the detection component 30, the first valve 41, and the second valve 42 can control the inflow, retention, and outflow of the liquid to be detected under different pressure conditions, thereby achieving an efficient and accurate liquid detection process. The negative pressure is used to draw the liquid, i.e., to introduce the liquid to be detected, the normal pressure is used to trigger detection, and the positive pressure is used to discharge the liquid, i.e., to discharge the liquid to be detected. The entire process of drawing the liquid, detection, and discharging the liquid can be automatically performed in sequence, thereby making the entire operation process automatic and efficient. The detection component 30 detects the liquid to be detected when the cavity 201 is blocked from the upstream pipeline and the downstream pipeline, thereby improving the stability and accuracy of detection.

[0033] In some embodiments, the liquid detection device 100 further comprises a pressure adjusting device 50, the cavity 201 has a vent 23, the pressure adjusting device 50 communicates with the cavity 201 through the vent 23, and the vent 23 is arranged between the liquid inlet 21 and the liquid outlet 22. The pressure adjusting device 50 can be operated to make the pressure state in the cavity 201 be a negative pressure state or a positive pressure state.

[0034] The pressure adjusting device 50 can be used to more accurately control the pressure state in the cavity 201, so that the pressure state in the cavity 201 can be flexibly switched between the negative pressure state and the positive pressure state, thereby ensuring the stability of the flow and detection process of the liquid to be detected. The design of the vent 23 makes it convenient for the pressure adjusting device 50 to adjust the pressure in the cavity 201, and the pressure adjustment is efficient and accurate, thereby ensuring the stability of the detection environment.

[0035] The pressure adjusting device 50 is configured as a peristaltic pump. The peristaltic pump moves in a first direction, and the pressure state in the cavity 201 is a negative pressure state. The peristaltic pump moves in a second direction, and the pressure state in the cavity 201 is a positive pressure state. The first direction and the second direction are opposite to each other.

[0036] The pressure adjusting device 50 is designed as a peristaltic pump, and the automatic switching between the negative pressure state and the positive pressure state in the cavity 201 is achieved by the forward and reverse movements of the peristaltic pump. The peristaltic pump provides accurate pressure control, avoids the complexity of traditional pressure adjustment methods, and improves the automation degree and accuracy of pressure adjustment in the cavity 201.

[0037] Specifically, the peristaltic pump includes a pump tube 51 for conveying gas. One end of the pump tube 51 communicates with the vent 23, and the other end of the pump tube 51 communicates with the external environment. The gas in the cavity 201 is discharged to the external environment through the vent 23 to form a negative pressure in the cavity 201. The air in the external environment is introduced into the cavity 201 through the vent 23 to form a positive pressure in the cavity 201. During the process of forming the positive pressure or the negative pressure in the cavity 201, the liquid to be detected cannot enter the pump tube 51, and the pump tube 51 cannot contact the liquid to be detected, thereby not affecting the detection effect of the liquid to be detected, and the peristaltic pump does not need to be cleaned.

[0038] The liquid extraction, detection and liquid discharge processes are described below in combination with specific application scenarios:

[0039] Liquid extraction: the peristaltic pump moves in the first direction, which can be understood as forward rotation of the peristaltic pump, and air is extracted from the cavity 201 through the pump tube 51 to the external environment, the cavity 201 forms a negative pressure, under the action of the negative pressure, the first valve 41 opens to open the liquid inlet 21, and the second valve 42 closes to close the liquid outlet 22, the peristaltic pump continues to move in the first direction, under the continuous action of the negative pressure, the liquid to be detected is sucked into the cavity 201, which is the liquid extraction process.

[0040] Detection: the peristaltic pump stops moving, the cavity 201 is in a normal pressure state, accordingly, the first valve 41 closes to close the liquid inlet 21, and the second valve 42 closes to close the liquid outlet 22, the liquid to be detected remains in the cavity 201, at this time, the liquid to be detected is stationary, stable and has no flow, the detection component 30 triggers to detect the liquid to be detected, which is the detection process.

[0041] Liquid discharge: then, the peristaltic pump moves in the second direction, which can be understood as reverse rotation of the peristaltic pump, air from the external environment is extracted into the cavity 201 through the pump tube 51, the cavity 201 forms a positive pressure, under the action of the positive pressure, the first valve 41 closes to close the liquid inlet 21, and the second valve 42 opens to open the liquid outlet 22, the peristaltic pump continues to move in the second direction, under the continuous action of the positive pressure, the liquid to be detected is discharged from the cavity 201, which is the liquid discharge process. Above, the liquid extraction, detection and liquid discharge are automatically performed in sequence, and the process of introducing the liquid to be detected from the upstream pipeline into the cavity 201, detecting the liquid in the cavity 201, and discharging the liquid to be detected from the cavity 201 to the downstream pipeline is automatically completed, the whole process is automated, efficient and the detection result is accurate and reliable.

[0042] In some embodiments, along the direction of gravity, the liquid inlet 21 is located above the liquid outlet 22, the vent 23 is arranged adjacent to the liquid inlet 21, and the detection component 30 is arranged adjacent to the liquid outlet 22; the highest liquid level of the liquid to be detected in the cavity 201 is lower than the vent 23. By setting the relative positions of the liquid inlet 21, the liquid outlet 22 and the detection component 30, it is ensured that the liquid to be detected flows smoothly under the action of gravity, and the detection component 30 is adjacent to the liquid outlet 22, corresponding to a more stable position of the liquid, which is also applicable to the case where the bottom layer of the liquid needs to be detected, ensuring that the detection component 30 is always in the best detection position, thereby ensuring that the detection result is accurate and reliable. The position of the vent 23 avoids the liquid to be detected flowing into the vent 23, causing unstable pressure, ensuring the smooth detection of the liquid to be detected, and also avoids the liquid to be detected entering the pressure regulating device 50 through the vent 23, which pollutes / damages the pressure regulating device 50, and also avoids the cleaning problem of the pressure regulating device 50 caused by the liquid to be detected entering.

[0043] For example, when the liquid to be detected is espresso, the TDS (Total dissolved solids) value of the espresso can be detected. To ensure the accuracy of the TDS value detection, the lower layer of the espresso liquid needs to be detected after the espresso is stratified. In this embodiment, the cavity 201 can hold the espresso for a preset period of time to allow the espresso to stratify. After stratification, the upper layer is coffee grease and the lower layer is coffee liquid. The detection component is arranged adjacent to the liquid outlet 22 and can correspondingly detect the lower layer of coffee liquid. In this way, the accuracy of the detection result can be ensured.

[0044] In some embodiments, the first valve 41 is configured as a first one-way valve, and the second valve 42 is configured as a second one-way valve. The first one-way valve opens when the pressure state in the cavity 201 is negative pressure, and the second one-way valve opens when the pressure state in the cavity 201 is positive pressure. By using two one-way valves, the flow of the liquid to be detected can be controlled under certain pressure conditions, reducing the need for manual operation and enhancing the reliability of the system. When the pressure is negative, the liquid to be detected flows into the cavity 201; when the pressure is positive, the liquid to be detected flows out of the cavity 201, achieving automation of the liquid flow control.

[0045] Specifically, the first one-way valve is configured as a first duckbill valve, and the second one-way valve is configured as a second duckbill valve. The first duckbill valve automatically opens when the pressure state in the cavity 201 is negative pressure, and the second duckbill valve automatically opens when the pressure state in the cavity 201 is positive pressure.

[0046] Specifically, when the pressure state in the cavity 201 is negative pressure, the first duckbill valve automatically opens under the action of negative pressure, and the second duckbill valve closes; when the pressure state in the cavity 201 is positive pressure, the first duckbill valve closes, and the second duckbill valve automatically opens under the action of positive pressure.

[0047] By automatically opening and closing the duckbill valve, reliable pressure control and liquid flow management are achieved. The duckbill valve automatically opens or closes under negative or positive pressure, reducing the mechanical failure rate of the valve and improving the stability of the system. Moreover, the duckbill valve does not require electrical control, simplifying the control logic of the liquid detection device 100. In addition, the duckbill valve has a low cost and is easy to replace, reducing the cost of the liquid detection device 100.

[0048] Of course, in other implementable solutions, the first valve 41 and the second valve 42 can also be solenoid valves, which can also achieve automation of fluid control. Specifically, the first valve 41 is configured as a first solenoid valve, and the second valve 42 is configured as a second solenoid valve. The first solenoid valve is controlled to open when the pressure state in the cavity 201 is negative pressure, and the second solenoid valve is controlled to open when the pressure state in the cavity 201 is positive pressure.

[0049] The first electromagnetic valve and the second electromagnetic valve are in communication connection with the controller, and the controller controls the first electromagnetic valve or the second electromagnetic valve to open based on the operating parameter of the pressure regulating device 50. When the pressure regulating device 50 is configured as a peristaltic pump, when the peristaltic pump moves in the first direction, the pressure state in the cavity 201 is a negative pressure state, the controller controls the first electromagnetic valve to open, at this time, the second electromagnetic valve is closed; when the peristaltic pump moves in the second direction, the pressure state in the cavity 201 is a positive pressure state, the controller controls the second electromagnetic valve to open, at this time, the first electromagnetic valve is closed; when the peristaltic pump stops moving, the pressure state in the cavity 201 is a normal pressure state, at this time, the first electromagnetic valve and the second electromagnetic valve are both closed.

[0050] Using the electromagnetic valve instead of the duckbill valve makes the opening and closing of the valve realized by electric control, which is suitable for application scenarios that require precise control. Through the controlled operation of the electromagnetic valve, the flow of the liquid to be detected can be adjusted more flexibly, and the intelligent level of the system is improved.

[0051] In some embodiments, the liquid detection device 100 further comprises a first connector 61 and a second connector 62, the first one-way valve is fixed to the liquid inlet 21 through the first connector 61, and the second one-way valve is fixed to the liquid outlet 22 through the second connector 62. The first connector 61 and the second connector 62 are provided, which can facilitate the installation and replacement of the first one-way valve and the second one-way valve, the positioning of the first one-way valve and the second one-way valve is more reliable, and the reliable connection with the upstream pipeline and the downstream pipeline is facilitated.

[0052] Referring to Figure 2 and Figure 3 , the cavity 201 is provided with a drainage groove 24, the drainage groove 24 has a first end 241 close to the liquid inlet 21, the first end 241 is arranged in the liquid inlet direction of the liquid inlet 21, and the drainage groove 24 guides the liquid to be detected flowing in through the liquid inlet 21.

[0053] The drainage groove 24 is designed to guide the liquid to be detected flowing into the cavity 201, the liquid to be detected flows smoothly into the cavity 201 under the guidance of the drainage groove 24, so as to avoid turbulent flow or uneven flow of the liquid to be detected when entering the cavity 201, avoid splashing, ensure smooth flow of the liquid to be detected, and improve the detection accuracy.

[0054] In some embodiments, the liquid inlet direction of the liquid inlet 21 is inclined relative to the direction of gravity, and the inclination direction is toward the drainage groove 24, so that the liquid to be detected is more reliably guided by the drainage groove 24. The position of the liquid inlet 21 is biased relative to the center of the liquid container 20, and the liquid inlet 21 can be closer to the drainage groove 24 to guide the liquid to be detected more smoothly.

[0055] Further, the cavity 201 comprises a contraction area 25 adjacent to the liquid outlet 22, the detection component 30 extends into the contraction area 25, and the drainage groove 24 extends to the contraction area 25, i.e. the second end 242 of the drainage groove 24 is located in the contraction area 25, and the liquid to be detected enters the contraction area 25 through the drainage groove 24. The contraction area 25 is arranged to enhance the concentrated flow of the liquid to be detected, so as to ensure that the detection component 30 can more accurately detect the characteristics of the liquid. The extension design of the drainage groove 24 further guides the liquid to be detected into the contraction area 25, effectively improving the detection accuracy.

[0056] The contraction area 25 is arranged to facilitate the concentration of the liquid to be detected entering the cavity 201, so that the liquid parameters can be conveniently and accurately detected even in the case of a small amount of liquid to be detected, and the consumption of the material for making the liquid to be detected is reduced.

[0057] In some embodiments, the liquid detection device 100 further comprises a fixing member 60 connected to the liquid container 20, the liquid container 20 is provided with a mounting passage 26 communicating with the cavity 201, the detection part 31 of the detection component 30 extends into the cavity 201 through the mounting passage 26, and the detection component 30 is fixedly connected to the mounting passage 26 through the fixing member 60. The structure that the detection component 30 is fixedly connected to the liquid container 20 ensures the stability of the detection component 30 in the cavity 201, avoiding the influence of detection accuracy due to vibration or external force during the flow of the liquid to be detected.

[0058] The detection component 30 comprises a detection part 31 extending into the cavity 201 and a lead part 32 located outside the cavity 201, a part of the mounting passage 26 extends into the fixing member 60, and the lead part 32 extends out from the end of the fixing member 60. The fixing member 60 can be fixed to the outer wall of the liquid container 20 by screws. In this way, the fixing member 60 ensures that the detection component 30 does not move or vibrate during the flow of the liquid to be detected, and can ensure more reliable installation of the detection component 30, thereby maintaining the detection accuracy.

[0059] The liquid detection device 100 in the above embodiments can also introduce clean water or cleaning liquid to clean the liquid container 20 after liquid detection by performing the liquid extraction process again, and then perform the liquid discharge process again to discharge the cleaned liquid. Of course, the liquid extraction process and the liquid discharge process can also be repeatedly performed multiple times to achieve more thorough cleaning. The cleaning process of the liquid detection device 100 can be automatically performed, which is very convenient for users. For example, the cleaning process can be controlled by the peristaltic pump. When the liquid detection device 100 completes liquid detection, the peristaltic pump moves in the second direction to discharge the residual liquid to be detected in the cavity 201. Then, the peristaltic pump moves in the first direction, and clean water or cleaning liquid is injected into the cavity 201. After cleaning is completed, the peristaltic pump moves in the second direction again to discharge the cleaned liquid. The cleaning process can be automatically completed, which ensures the cleanliness of the liquid detection device 100 and reduces the complexity of maintenance.

[0060] The above detection element can be used to detect a plurality of parameters of the liquid to be detected, such as water content, fat content, protein content, sugar content, salt content, total dissolved solids (TDS), microbial indicators, and the like. It is especially suitable for edible liquid detection. The processes of liquid extraction, detection, and liquid discharge can be automatically controlled, the detection component 30 can accurately detect the parameters of the liquid, and the detection results can be fed back to the controller. For example, TDS value detection of concentrated coffee or water quality detection of drinking water.

[0061] Referring to Figure 5 and Figure 6 In another embodiment, the liquid detection device 100 includes a liquid container 20a and a detection component 30. The liquid container 20a defines a cavity 201 for containing the liquid to be detected. The liquid container 20a includes a liquid inlet 21 and a liquid outlet 22 communicating with the cavity 201. The liquid inlet 21 is used to connect an upstream pipeline, and the liquid outlet 22 is used to connect a downstream pipeline. The detection component 30 extends into the cavity 201.

[0062] The liquid detection device 100 further includes a first valve 41 and a second valve 42. The first valve 41 is arranged at the liquid inlet 21, and the second valve 42 is arranged at the liquid outlet 22. The cavity 201 communicates with the upstream pipeline through the liquid inlet 21 and communicates with the downstream pipeline through the liquid outlet 22. The liquid inlet 21 controls the inflow of the liquid to be detected through the first valve 41, and the liquid outlet 22 controls the outflow of the liquid to be detected through the second valve 42. The design of the liquid container 20 can ensure that the liquid to be detected reliably flows into the cavity 201 and provides a stable environment for detection.

[0063] The pressure state in the cavity 201 is alternatively negative pressure state, normal pressure state or positive pressure state; in the negative pressure state, the first valve 41 opens the liquid inlet 21 and the second valve 42 closes the liquid outlet 22 to introduce the liquid to be detected into the cavity 201; in the normal pressure state, the first valve 41 closes the liquid inlet 21 and the second valve 42 closes the liquid outlet 22 to keep the liquid to be detected in the cavity 201, and the detection component 30 is triggered in the normal pressure state; in the positive pressure state, the first valve 41 closes the liquid inlet 21 and the second valve 42 opens the liquid outlet 22 to discharge the liquid to be detected out of the cavity 201.

[0064] Different from the above embodiment, the liquid inlet 21 and the liquid outlet 22 of the liquid container 20a are oppositely arranged along the center line of the liquid container 20, and the cavity 201 includes a tapered region 27 adjacent to the liquid inlet 21, i.e. the region of the cavity 201 adjacent to the liquid inlet 21 is configured to gradually increase in cross-sectional area. The bottom wall of the cavity 201 adjacent to the liquid outlet 22 is arranged substantially horizontally relative to the direction of gravity, and the detection component 30 extends into the cavity 201 from above the bottom wall. The liquid container 20a is simpler to manufacture, thereby reducing manufacturing cost.

[0065] The first valve 41, the second valve 42, the first joint 61, the second joint 62 and the pressure adjusting device 50 are arranged the same as in the above embodiment, and will not be described again here.

[0066] The liquid detection device 100 in the above embodiment can realize efficient and accurate liquid detection process under different pressure states by the above structure and function description, has high detection precision, simple operation process and can realize automatic control, and is suitable for various liquid detection scenarios.

[0067] The above liquid detection device 100 can be used in any equipment requiring liquid detection, such as coffee machine, tea machine, etc., and can also be used in other beverage brewing devices or devices for inputting or outputting fluid.

[0068] It should be understood that although the present specification is described in terms of embodiments, each embodiment does not necessarily contain only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0069] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application, and any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A liquid detection device, characterized by: The application relates to a liquid container, comprising: a liquid container defining a cavity for containing a liquid to be detected, the liquid container comprising a liquid inlet and a liquid outlet communicating with the cavity, the liquid inlet being used for connecting an upstream pipeline, and the liquid outlet being used for connecting a downstream pipeline; a detection component extending into the cavity; a first valve arranged at the liquid inlet; a second valve arranged at the liquid outlet; the pressure state in the cavity is alternatively a negative pressure state, an atmospheric pressure state or a positive pressure state; in the negative pressure state, the first valve opens the liquid inlet, and the second valve closes the liquid outlet, so as to introduce the liquid to be detected into the cavity; in the atmospheric pressure state, the first valve closes the liquid inlet, and the second valve closes the liquid outlet, so as to keep the liquid to be detected in the cavity, and the detection component is triggered in the atmospheric pressure state; in the positive pressure state, the first valve closes the liquid inlet, and the second valve opens the liquid outlet, so as to discharge the liquid to be detected from the cavity.

2. The liquid detection device of claim 1, wherein, The application further comprises a pressure regulating device, the cavity is provided with a vent, the pressure regulating device communicates with the cavity through the vent, and the vent is arranged between the liquid inlet and the liquid outlet; the pressure regulating device is operable to make the pressure state in the cavity be the negative pressure state or the positive pressure state.

3. The liquid detection device of claim 2, wherein, The pressure regulating device is configured as a peristaltic pump; the peristaltic pump moves in a first direction, and the pressure state in the cavity is the negative pressure state; the peristaltic pump moves in a second direction, and the pressure state in the cavity is the positive pressure state; wherein the first direction and the second direction are opposite to each other.

4. The liquid detection device of claim 2, wherein, In the direction of gravity, the liquid inlet is located above the liquid outlet, the vent is arranged close to the liquid inlet, and the detection component is arranged close to the liquid outlet; the highest liquid level of the liquid to be detected in the cavity is lower than the vent.

5. The liquid detection device of claim 1, wherein, The first valve is configured as a first one-way valve, and the second valve is configured as a second one-way valve; the first one-way valve is opened when the pressure state in the cavity is the negative pressure state, and the second one-way valve is opened when the pressure state in the cavity is the positive pressure state.

6. The liquid detection device of claim 5, wherein, The first one-way valve is configured as a first duckbill valve, and the second one-way valve is configured as a second duckbill valve; the first duckbill valve is automatically opened when the pressure state in the cavity is the negative pressure state; and the second duckbill valve is automatically opened when the pressure state in the cavity is the positive pressure state.

7. The liquid detection device of claim 5, wherein, The first valve is configured as a first electromagnetic valve, and the second valve is configured as a second electromagnetic valve; the first electromagnetic valve is controlled to be opened when the pressure state in the cavity is the negative pressure state; and the second electromagnetic valve is controlled to be opened when the pressure state in the cavity is the positive pressure state.

8. The liquid detection device of any one of claims 1-7, wherein, The cavity is provided with a drainage groove, the drainage groove has a first end close to the liquid inlet, and the first end is arranged in the liquid inlet direction of the liquid inlet; and the drainage groove guides the liquid to be detected flowing in through the liquid inlet.

9. The liquid detection device of claim 8, wherein, The cavity comprises a contraction area adjacent to the liquid outlet, the detection component extends into the contraction area, the drainage groove extends to the contraction area in an inclined manner, and the liquid to be detected enters the contraction area through the drainage groove.

10. The liquid detection device of any one of claims 1-7, wherein, The liquid container is provided with a mounting channel communicating with the cavity, a detection part of the detection component extends into the cavity through the mounting channel, and the detection component is fixedly connected with the mounting channel through the fixing member.

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