Fluid control assembly and water quality analyzer

Abstract

The utility model provides a fluid control assembly and a water quality analyzer. The fluid control assembly comprises a container with an outlet hole in the lower end; the pipe fitting is arranged at the lower end of the container and is in fluid communication with the outlet hole, the pipe fitting extends downwards from the lower end of the container by a length L1, the pipe fitting is provided with an open pipe fitting tail end and a floater, and the floater is arranged in the container; wherein after the liquid is collected in the container, the lower end of the floater immersed in the liquid and the inner surface of the container form a contact surface, the contact surface has a contact area S, the equivalent cross sectional area of the floater with an isometric height cylinder is S1, and the contact area S is less than or equal to 0.64 of the equivalent cross sectional area S1 of the floater; and the diameter # imgabs0 # of the pipe fitting is set so that the liquid flowing into the container can be kept in the pipe fitting under the capillary action of the liquid. By adopting the fluid control assembly disclosed by the utility model, gas-liquid separation control can be realized with low cost and high efficiency, and liquid can be discharged in time when an analyzer breaks down.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control. Specifically, the utility model relates to a fluid control component for controlling gas-liquid separation in a water quality analyzer. Background Art

[0002] A water quality analyzer is an instrument used to measure and analyze various indicators in water bodies, and is widely used in multiple fields such as environmental monitoring, drinking water and sewage treatment, agriculture and fishery, industrial production, and laboratory research.

[0003] Specifically, a water quality analyzer, for example, uses colorimetry to determine total phosphorus (TP), total nitrogen (TN), silicon dioxide, ammonia, COD, etc. in surface water, sewage, and water samples during industrial production processes. Such a water quality analyzer determines the content of the component to be measured by measuring the absorption degree of a colored substance solution to light of a specific wavelength. During the use of the water quality analyzer, air is introduced into the reaction pool of the water quality analyzer for spraying to fully mix the sample and the reagent. The sprayed air will contain some reagents, such as acidic reagents, and these gases will flow out of the reaction pool, which will cause certain corrosion to the components in the analyzer. To avoid corrosion, these gases need to be led out of the analyzer through pipelines to prevent corrosion of the instrument components.

[0004] Sometimes, due to some failures of the analyzer, the liquid will be led out through the pipeline together with the gas. For safety reasons, a leakage sensor is also provided in the existing analyzer to detect the led-out fluid. When a certain amount of liquid is detected, it indicates that the equipment has a failure, and the sensor will send a signal to the controller to cause the analyzer to stop urgently.

[0005] In the prior art, a three-way solenoid valve is connected to the pipeline for leading the air flow out of the instrument. When a certain amount of liquid accumulates to a certain amount, the three-way solenoid valve is controlled to open to discharge the liquid. However, in order to control the three-way solenoid valve, some dedicated hardware needs to be set up to connect to the solenoid valve for control. In addition, the solenoid valve is usually controlled by an additional sensor provided in the pipeline, and the additional solenoid valve will only be opened when the water in the pipeline accumulates to a certain amount, and the water in the pipeline cannot be discharged in the first time.

[0006] Therefore, it is desired to improve the control means for discharging the gas-liquid mixture in the existing water quality analyzer, and provide a low-cost alternative fluid control means that can make the gas flow out in a controlled manner and also achieve gas-liquid separation. Summary of the Utility Model

[0007] To overcome the deficiencies of the prior art, the present utility model provides a fluid control assembly. The fluid control assembly includes: a container having an upper end and a lower end of the container, and the lower end of the container has an outlet hole; a pipe fitting disposed at the lower end of the container and in fluid communication with the outlet hole, the pipe fitting extending downward from the lower end of the container by a length L1, and the pipe fitting having an open end; and a float disposed within the container; wherein after liquid is collected within the container, the lower end of the float immersed in the liquid forms a contact surface with the inner surface of the container, the contact surface having a contact area S, the float having an equivalent cross-sectional area of a cylinder with an equal volume height of S1, and the contact area S being less than or equal to 0.64 of the equivalent cross-sectional area S1 of the float; and the diameter of the pipe fitting is set such that the liquid flowing into the container can be retained within the pipe fitting under the capillary action of the liquid.

[0008] By using the fluid control assembly according to the present utility model, the gas-liquid mixture flowing into the fluid control assembly can be shunt-controlled, enabling the gas to flow out of the fluid control assembly in a controlled manner and achieving gas-liquid separation control. The pipe fitting at the lower end of the container can hold the liquid to form a liquid seal portion, preventing the gas from flowing out of the pipe fitting.

[0009] According to one aspect of the present utility model, the float is hollow; and the float has a first float section and a second float section, the first float section and the second float section being connected, and the cross-section of the second float section gradually decreasing from the position where it is connected to the first float section, and the reduced end of the second float section forming the lower end of the float. According to still another aspect of the present utility model, the first float section is cylindrical and the second float section is conical.

[0010] According to still another aspect of the present utility model, the container has a first container section and a second container section, the first container section and the second container section being connected, the first container section being cylindrical and the second container section being conical, and the reduced end of the second container section being connected to the pipe fitting.

[0011] The float with a conical end and the container with a conical end cooperate with each other, enabling a smaller contact area S, such that the float can reliably float after the fluid flows into the control assembly.

[0012] According to still another aspect of the present utility model, the diameter of the pipe fitting is less than or equal to 5.4 mm, and the length L1 of the pipe fitting is less than or equal to 10 mm; the pipe fitting is straight or U-shaped. The pipe fitting of this size can provide a liquid seal portion for achieving capillary action and prevent the gas from flowing out of the pipe fitting.

[0013] According to another aspect of the present utility model, the density of the float is at least 50% less than the density of the liquid. Considering the preferred cumulative liquid height in the container, the relationship between the contact area S and the equivalent cross-sectional area S1 of the float (40) should satisfy S ≤ 0.31S1.

[0014] According to another aspect of the present utility model, a connection cover is provided at the upper end of the container. The connection cover is provided with an outlet portion for connecting an outflow pipe for gas to flow out, and the connection cover is provided with an inlet portion for connecting an inflow pipe. The gas in the gas-liquid mixture of the fluid control assembly can flow out from the outlet portion, and the liquid in the gas-liquid mixture flows out from the end of the pipe fitting to perform gas-liquid separation. By connecting the corresponding pipes through the connection cover, the assembly and replacement of the fluid control assembly according to the present utility model are made more convenient.

[0015] According to another aspect of the present utility model, the fluid control assembly further includes a water collecting tray arranged to receive the liquid flowing out from the end of the pipe fitting, and a sensor for detecting the liquid is provided in the water collecting tray. Once the sensor senses the water volume in the water collecting tray, it indicates that the liquid overflow has reached the set value. The sensor can be connected to the corresponding controller to timely control the device to stop.

[0016] In addition, the present utility model also provides a water quality analyzer, which includes any one of the above-mentioned fluid control assemblies; and a reaction tank, and the reaction flow is connected to the container of the fluid control assembly through the inflow pipe. Preferably, the fluid flow rate flowing into the container through the inflow pipe is controlled to be less than 1.6 ml / s.

[0017] By applying the fluid control assembly according to the present utility model to the water quality analyzer, the reaction tank in the water quality analyzer can be connected to the container of the fluid control assembly through the inflow pipe, and gas-liquid separation of the fluid flowing out of the reaction tank can be achieved without a solenoid valve or other high-cost fluid control elements.

[0018] By applying the fluid control assembly according to the present utility model to the water quality analyzer, when a large amount of liquid gushes out from the reaction tank in a short time, the water quality analyzer according to the present utility model can be immediately detected by the liquid leakage sensor and stopped in time to reduce the damage to the analyzer. Description of the Drawings

[0019] To more fully understand the present utility model, reference may be made to the following description of exemplary embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A plan view of the fluid control assembly according to the first preferred embodiment of the present utility model is shown.

[0021] Figure 2 A state diagram of the first stage in the use process of the fluid control assembly according to the first preferred embodiment of the present utility model is shown.

[0022] Figure 3 Shows a schematic diagram of the second state during the use of the fluid control assembly according to the first preferred embodiment of the present utility model.

[0023] Figure 4 Shows a schematic diagram of the third state during the use of the fluid control assembly according to the first preferred embodiment of the present utility model.

[0024] Figure 5 Shows a plan view of the fluid control assembly according to the second preferred embodiment of the present utility model.

[0025] List of reference numerals

[0026] 10, 10’ Fluid control assembly

[0027] 20 Container

[0028] 21 Upper end of the container

[0029] 22 Lower end of the container

[0030] 23 Outlet hole

[0031] 30, 30’ Pipe fittings

[0032] 31, 31’ Ends of the pipe fittings

[0033] 40 Float

[0034] 41 Upper end of the float

[0035] 42 Lower end of the float

[0036] 50 Connecting cap

[0037] 51 Outlet part

[0038] 52 Inlet part

[0039] 61 Inflow pipe

[0040] 62 Outflow pipe

[0041] 71 Water collecting tray

[0042] 72 Sensor Detailed implementation manners

[0043] The present utility model will be further described below in conjunction with specific embodiments and the accompanying drawings. More details are elaborated in the following description for a full understanding of the present utility model. However, the present utility model can obviously be implemented in many other ways different from this description. Those skilled in the art can make similar extensions and deductions according to the actual application situation without departing from the connotation of the present utility model. Therefore, the protection scope of the present utility model should not be limited by the content of this specific embodiment.

[0044] Figure 1 A fluid control assembly 10 is shown according to a preferred embodiment of the present utility model. The fluid control assembly 10 is adapted to be installed in a water quality analyzer to control the fluid flowing out of the reaction tank of the water quality analyzer, especially for gas-liquid separation control.

[0045] As Figure 1 shown, the fluid control assembly 10 mainly includes a container 20, a pipe fitting 30 disposed below the container 20 and communicating with the container 20, and a float 40 disposed inside the container 20. Further, a water collecting tray 71 is provided below the pipe fitting 30, and a sensor 72 is provided to detect the liquid in the water collecting tray 71. Once the liquid in the water collecting tray 71 reaches a certain height, the sensor 72 can detect it and send a signal to the controller of the water quality analyzer.

[0046] The container 20 of the fluid control assembly 10 is tubular, preferably a plastic pipe. The tubular container 20 is vertically arranged, and the container 20 has a container upper end 21 and a container lower end 22. The container upper end 21 is provided with an outlet portion 51 and an inlet portion 52. The inlet portion 52 is used to connect to an inflow pipe 61 to receive the fluid flowing out of the reaction tank of the water quality analyzer. This part of the fluid may be gas or a gas-liquid mixture, while the outlet portion 51 is connected to an outflow pipe 62 for discharging gas. On the other hand, at the lower end of the container 20, an outlet hole 23 is formed for connecting to the pipe fitting 30, and the separated liquid will flow out from this outlet hole 23 to the lower pipe fitting 30.

[0047] In a preferred embodiment, the outlet portion 51 and the inlet portion 52 can be provided on a connecting cap 50, and the connecting cap 50 is detachably and sealingly connected to the body of the container 20 to form the container 20. In other alternative embodiments, the outlet portion 51 and the inlet portion 52 can also be provided on the side wall portion of the container upper end 21.

[0048] Further as Figure 1 shown, the pipe fitting 30 is disposed at the container lower end 22, and its upper end is in fluid communication with the outlet hole 23 of the container 20. The end of the pipe fitting 30 is open. In this embodiment, the pipe fitting 30 is a straight pipe extending downward, and the length it extends downward is L1. In other words, the height direction length from the connection position of the pipe fitting 30 and the container 20 to the end of the pipe fitting 30 is L1, and its diameter is In particular, the pipe fitting 30 has a relatively small diameter, and its diameter is set such that a small amount of liquid flowing into the container 20 can be retained within the pipe fitting 30 under the capillary action of the liquid. Only when the liquid flow rate into the container 20 is relatively large will the liquid be able to directly drain downward through the pipe fitting 30.

[0049] A float 40 is disposed inside the container 20 of the fluid control assembly 10. Figure 1 The initial operating state of the fluid control assembly 10 is shown. At this time, there is usually liquid in the container 20, and the liquid may come from the gas-liquid mixture to be separated or from the liquid drawn upward by the pipe fitting 30. In this state, the buoyant force acting on the float 40 is not sufficient to cause the lower end of the float to disengage from contact with the inner surface of the container 20. The upper end 41 of the float is exposed above the liquid, and the lower end 42 of the float is immersed in the liquid and in contact with the inner surface of the container 20. The cross-sectional area of the float 40 at the contact position is defined as the contact area S of the float 40. The size of the contact area S is set such that when the liquid in the container 20 accumulates to a certain height (i.e., when the vertical distance height L2 from the liquid level to the outlet hole reaches a certain degree), the float 40 can Figure 4 float upward as shown, and the contact between the lower end 42 of the float and the inner surface of the container 20 will be disengaged.

[0050] In particular, after there is liquid in the container 20, the contact area S defined by the cross-section of the float 40 at the contact position between the lower end 42 of the float 40 immersed in the liquid and the inner surface of the container 20 should be less than or equal to 0.64 of the equivalent cross-sectional area S1 of the cylinder with the same volume and height as the float, that is, the relationship between the contact area S and the equivalent cross-sectional area S1 of the float 40 satisfies S ≤ 0.64S1. Here, the equivalent cross-sectional area S1 of the cylinder with the same volume and height as the float refers to the circular cross-sectional area of the cylinder when the non-cylindrical float 40 is converted into a cylinder with the same volume and height. In a preferred embodiment, the shapes of the container 20 and the float 40 are as shown in Figure 1 figure, and the contact area S defined by the cross-section of the float 40 at the contact position between the lower end 42 of the float and the inner surface of the container 20 is a circular cross-sectional area, and the ratio between the circular cross-sectional area of the float 40 and the circular cross-sectional area of the cylinder with the same volume and height as the float 40 is not greater than 0.64.

[0051] Specifically, in the fluid control assembly 10 as shown in Figure 1 figure, when the gas-liquid mixture enters the container 20 through the inflow pipe 61, the liquid accumulates to a certain height L2 in the container 20, and the float 40 in the container 20 will be subjected to a buoyant force. At this time, the liquid will flow out from the lower pipe fitting 30. In this case, the buoyant force F acting on the float 40 in the container 20 is 浮 as follows:

[0052] F_buoyancy = k × [G_float + S × (L1 + L2) × ρ × g]

[0053] Where, G 浮子 is the gravity of the float 40;

[0054] g is the acceleration due to gravity, 9.8;

[0055] ρ is the density of the liquid (usually water in the water quality analyzer, ρ = 1000 kg / m 3 );

[0056] L1 is the length of the pipe fitting 30;

[0057] L2 is the height of the liquid in the container 20;

[0058] k is a coefficient, usually greater than or equal to 1.0 (k ≥ 1.0), k is related to the flow rate of the fluid flowing into the container 20. Usually, the higher the flow rate of the fluid, the larger the set value of k.

[0059] Under the action of buoyancy, the upward acceleration a of the float is:

[0060]

[0061] At this time, the distance d (m) that the float 40 rises within a very short time t (for example, 0.05 s) is:

[0062]

[0063] The flow rate Q (mL / s) of the liquid entering the container 20 will cause the liquid level height in the container 20 to increase by H:

[0064]

[0065] Where: S 容器 is the cross-sectional area of the container 20

[0066] S 浮子 is the cross-sectional area of the float 40

[0067] If d > H, then the float 40 will be able to float upward, which will cause the contact area between the container 20 and the pipe fitting 30 to be completely opened, that is:

[0068]

[0069] To adapt to the corresponding structure and function of the water quality analyzer, in the preferred embodiment of the present invention, the radius of the container 20 is 7 mm, the radius of the float is 5 mm, the flow rate Q flowing from the reaction tank of the water quality analyzer into the container 20 is 1.6 mL / s, the density of the float 40 is set to 0.3 of the liquid, and L1 << L2. At this time, k is at least 1.05.

[0070] In order for the float 40 to float in the downwardly open container 20, the contact area S between the float 40 and the interior of the container 20 should be as small as possible.

[0071] According to the following formula:

[0072]

[0073] Preferably, the density of the float 40 is less than 0.5 of the density of the liquid flowing into the container 20. Here, the liquid is usually water. In this embodiment, the density of the float 40 is 0.3 of the density of the liquid, and k is usually set to 1.1. Then:

[0074]

[0075] It can be seen therefrom that the contact area S defined by the cross-section of the float 40 at the position where the lower end 42 of the float 40 immersed in the liquid contacts the inner surface of the container 20 should be less than or equal to 0.64 of the equivalent cross-sectional area S1 of the cylinder with the same volume height of the float, that is, the relationship between the contact area S and the equivalent cross-sectional area S1 of the float 40 satisfies S≤0.64S1.

[0076] For the application of the flow control assembly 1 in a water quality analyzer, especially for the combination of the plastic test tube container 20 and the float 40, the liquid level height in the container 20 for floating the float 40 preferably satisfies L1 = L2. From this, it can be obtained that when S is 0.31 of the cross-sectional area of the cylinder with the same volume as the float, the float 40 can float reliably when the liquid flows into the container 20, and the contact surface between the float 40 and the interior of the container 20 is completely separated.

[0077] On the other hand, the length L1 of the pipe fitting 30 in the flow control assembly 10 should be as short as possible. However, considering the arrangement of the drain pan 71 and the sensor 72 installed below, in a preferred embodiment, the pipe fitting 30 is preferably 8 - 12 mm, and more preferably set to 10 mm.

[0078] In addition, according to the calculation formula of the capillary length:

[0079]

[0080] Where: γ is the surface tension of the liquid, with the unit N / m;

[0081] g is the acceleration due to gravity.

[0082] ρ is the density of the liquid, with the unit kg / m 3；

[0083] K is the capillary length.

[0084] In order to hold the liquid in the pipe fitting 30, its radius should not be greater than K. Correspondingly, for the water at 20°C in the water quality analyzer in the preferred embodiment, γ is 0.0728 N / m, and the density of water is 1000 kg / m 3 ; The diameter of the pipe fitting 30 can be determined according to the following formula

[0085]

[0086] That is, the diameter of the pipe fitting 30 should be less than or equal to 5.4 mm. In the preferred embodiment, the diameter of the pipe fitting 30 is set to 1.6 mm. Such a diameter of the pipe fitting 30 can hold a liquid such as water in the pipe fitting 30, thereby preventing gas from flowing out of the pipe fitting 30.

[0087] In the preferred embodiment, both the container 20 and the float 40 are made of plastic test tubes. As Figure 1 shown, the hollow plastic float 40 has a cylindrical first float section at the upper part and a conical second float section at the lower part. The cross-section of the second float section gradually narrows from the position connected to the first float section, and the narrowed end of the second float section forms the lower end 42 of the float. The external container 20 has a similar contour shape. Specifically, the container 20 has a cylindrical first container section and a conical second container section. The first container section and the second container section are connected, and the narrowed end of the conical second container section is connected to the pipe fitting. The cone angle of the second float section is smaller than the cone angle of the second container section. Experiments show that the inner surfaces of the lower end 42 of the conical float section and the lower end 22 of the conical container 20 are butt-jointed to achieve a relatively small contact area S, ensuring that the contact area S is less than or equal to 0.64 of the equivalent cross-sectional area S1 of the float 40, so that the float 40 can be reliably floated by the liquid during use.

[0088] Figures 2 to 4 Shows the usage process according to the preferred embodiment of the present invention.

[0089] Figure 2Shows the first state of the fluid control assembly 10 according to the first preferred embodiment of the present utility model. This first state is the state in which the water quality analyzer is in normal use. In this state, the fluid flowing out of the reaction tank of the water quality analyzer enters the container 20 through a pipeline. During the normal use of the water quality analyzer, the fluid flowing out of the reaction tank is mainly gas, and some steam will be carried in the gas. When the fluid flows into the container 20, the moisture in the fluid will condense to the bottom of the container 20 and fill into the pipe fitting 30. Under the action of liquid tension, the liquid will remain in the pipe fitting 30, thus forming a water seal. Even if part of the outlet hole 23 of the container 20 is open, the gas will not flow out of the pipe fitting 30. At this time, the float 40 is placed in the container 20, but the float 40 is not affected by buoyancy. The lower end 42 of the float of the float 40 contacts the inside of the container 20.

[0090] Figure 3 Shows the second state of the fluid control assembly 10 according to the first preferred embodiment of the present utility model. In this second state, more liquid flows out of the reaction tank of the water quality analyzer together with the gas. The liquid flowing out of the reaction tank accumulates in the inner cavity of the container 20. At this time, the float 40 is affected by buoyancy but not enough to float upward. The lower end of the float of the float 40 fails to separate from the inner surface of the lower end of the container 20. Since the outlet hole 23 at the bottom of the container 20 cannot be completely sealed, at this time, under the action of pressure of the fluid in the container 20, the liquid begins to drip downward through the pipe fitting 30 and is collected in the water collecting tray 71. However, at this time, the amount of water in the water collecting tray 71 is not enough to trigger the sensor 72. In this state, there is still always liquid in the pipe fitting 30 in the state of a liquid seal, and the gas still only flows out through the outlet part 51. However, as time goes by, when the amount of water collected in the water collecting tray 71 is enough to trigger the sensor 72, the water quality analyzer will trigger an error and stop running.

[0091] Figure 4 Shows the third state of the fluid control assembly 10 according to the first preferred embodiment of the present utility model. In this third state, a large amount of liquid flows out of the reaction tank of the water quality analyzer together with the gas and quickly flows into the container 20. The liquid in the container 20 accumulates rapidly. At this time, the buoyancy force received by the float 40 is greater than the sum of its gravity and the downward pressure on the contact area S. The float 40 rises, the water outlet hole 23 is completely opened, and the liquid quickly flows downward through the pipe fitting 30 into the water collecting tray 71. The liquid level in the water collecting tray 71 rises rapidly to trigger the sensor 72, and the sensor 72 sends a fault signal to the controller, and the controller stops the operation of the water quality analyzer.

[0092] Figure 5FIG. 0 shows a schematic view of a fluid control assembly 10' according to a second preferred embodiment of the present utility model. In this embodiment, like components are denoted by like reference numerals. The fluid control assembly 10' is connected to a U-shaped pipe fitting 30' below the container. The U-shaped pipe fitting 30' can provide a more reliable liquid seal. When the U-shaped pipe fitting 30' is filled with liquid, the liquid is retained in the U-shaped pipe fitting 30', thereby preventing gas from the reaction tank from flowing out of the opening of the U-shaped pipe fitting 30'.

[0093] In Figure 5 the shown fluid control assembly 10', the length L1 of the pipe fitting 30' refers to the height distance between the connection position of the pipe fitting 30' and the container 20 and the end 31' of the pipe fitting.

[0094] By applying the fluid control assemblies 10, 10' according to the present utility model to a water quality analyzer, the reaction tank in the water quality analyzer can be connected to the container 20 of the fluid control assemblies 10, 10' through an inflow pipe. Without a solenoid valve or other hardware for controlling the solenoid valve, gas-liquid separation control of the fluid flowing out of the reaction tank can be achieved.

[0095] By applying the fluid control assemblies 10, 10' according to the present utility model to a water quality analyzer, when a large amount of liquid surges out of the reaction tank in a short period of time, the water quality analyzer according to the present utility model can be immediately stopped in time to prevent more liquid from flowing out and damaging the instrument.

[0096] Although the present utility model is disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present utility model. Therefore, any modification, equivalent change and decoration made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A fluid control component, the fluid control component comprising: A container (20), the container (20) having an upper end of the container and a lower end of the container, the lower end of the container having an outlet hole (23); Pipe fittings (30, 30'), the pipe fittings (30, 30') being provided at the lower end of the container and in fluid communication with the outlet hole, the pipe fittings (30, 30') extending downward from the lower end of the container by a length L1, the pipe fittings (30, 30') having an open end of the pipe fitting (31); and A float (40), the float (40) being provided within the container (20); Characterized in that Within the container (20), the lower end of the float (40) located in the liquid contacts the inner surface of the container (20), the cross-sectional area of the float at the contact location defining a contact area S, the float (40) having an equivalent cross-sectional area of a cylinder of equal volume height of S1, The relationship between the contact area S and the equivalent cross-sectional area S1 of the float (40) satisfies S ≤ 0.64S1; And the diameter of the pipe fitting (30, 30') is set such that the liquid flowing into the container (20) can be retained within the pipe fitting (30, 30') under the capillary action of the liquid.

2. The fluid control component according to claim 1, wherein, The float (40) is hollow; And the float (40) has a first float section and a second float section, the first float section and the second float section being connected, the second float section having a gradually decreasing cross-section starting from the position connected to the first float section, and the reduced end of the second float section forming the lower end of the float.

3. The fluid control assembly according to claim 2, wherein The first float section is cylindrical and the second float section is conical.

4. The fluid control assembly according to claim 3, wherein The container (20) has a first container section and a second container section, the first container section and the second container section being connected, the first container section being cylindrical and the second container section being conical, the reduced end of the second container section being connected to the pipe fittings (30, 30'), Wherein the cone angle of the second float section is less than the cone angle of the second container section.

5. The fluid control component according to claim 1, characterized in that, The diameter of the pipe fitting (30, 30') is less than or equal to 5.4 mm, and the length L1 of the pipe fitting (30, 30') is less than or equal to 10 mm; The pipe fittings (30, 30') are straight or U-shaped.

6. The fluid control assembly according to claim 1, wherein The density of the float (40) is at least less than 50% of the density of the liquid; The relationship between the contact area S and the equivalent cross-sectional area S1 of the float (40) satisfies S ≤ 0.31S1.

7. The fluid control assembly according to claim 1, wherein, An upper end of the container is provided with a connection cover (50), the connection cover being provided with an outlet portion for connecting an outflow pipe for gas to flow out, and the connection cover (50) being provided with an inlet portion (52) for connecting an inflow pipe (61), Gas in the gas-liquid mixture passing through the fluid control component can flow out from the outlet portion (51), and the liquid in the gas-liquid mixture flows out from the end of the pipe fitting for gas-liquid separation.

8. The fluid control component according to claim 1, characterized in that, The fluid control component further includes a water collecting tray (71) provided to receive the liquid flowing out from the end of the pipe fitting, and a sensor (72) for detecting the liquid is provided at the water collecting tray.

9. A water quality analyzer, characterized in that, The water quality analyzer includes: The fluid control component according to any one of claims 1-8; and A reaction tank, the reaction tank being connected to the container (20) through an inflow pipe (61).

10. The water quality analyzer according to claim 9, characterized in that, The fluid flow rate flowing into the container (20) through the inflow pipe (61) is controlled to be less than 1.6 ml / s.

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