Conductivity detector

Abstract

The utility model relates to a conductivity detector, which comprises a shell, a liquid inlet pipeline, a pressure reducing part, a first liquid outlet pipeline, a second liquid outlet pipeline and a second liquid outlet pipeline, the shell is provided with a liquid containing cavity, a liquid inlet hole and a liquid outlet hole, the liquid inlet hole and the liquid outlet hole are both communicated with the liquid containing cavity, and the liquid inlet pipeline comprises a first liquid inlet pipe section and a second liquid inlet pipe section, a liquid outlet of the first liquid inlet pipe section is communicated with the liquid inlet hole. The pressure reducing part is arranged between the first liquid inlet pipe section and the second liquid inlet pipe section, the first liquid inlet pipe section and the second liquid inlet pipe section are communicated through the pressure reducing part, liquid of the second liquid inlet pipe section flows through the pressure reducing part, the pressure of the liquid is reduced by the pressure reducing part to be smaller than a preset value, and then the liquid flows into the first liquid inlet pipe section; and the conductivity probe is used for detecting the conductivity of the liquid in the liquid containing cavity, in conclusion, through the arrangement of the pressure reduction piece, the conductivity detector can measure the liquid to be detected which cannot be detected before and has higher pressure after reducing the pressure of the liquid, and the maximum value of the liquid pressure which can be detected by the conductivity detector is improved.

Description

Technical Field

[0001] The present application relates to the technical field of conductivity detection, and in particular to a conductivity detector. Background Art

[0002] In order to detect the effect of sewage treatment, the relevant technology usually adopts a conductivity detector to detect the conductivity of the water after sewage treatment, and uses the test results as a standard for judging the amount of impurities in the water. The maximum pressure resistance value of the conductivity detector is low and it cannot detect liquids with higher pressure. Summary of the Invention

[0003] Based on this, it is necessary to provide a conductivity detector to address the problem that the maximum withstand pressure value of existing conductivity detectors is low and cannot detect liquids with higher pressures.

[0004] A conductivity detector comprising:

[0005] The housing comprises a liquid containing chamber, a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are both connected to the liquid containing chamber;

[0006] a liquid inlet pipe, comprising a first liquid inlet pipe section and a second liquid inlet pipe section, wherein the liquid outlet of the first liquid inlet pipe section is connected to the liquid inlet hole;

[0007] a pressure reducing member disposed between the first liquid inlet pipe section and the second liquid inlet pipe section, the first liquid inlet pipe section and the second liquid inlet pipe section being connected via the pressure reducing member, the liquid in the second liquid inlet pipe section flowing through the pressure reducing member and having its pressure reduced to less than a preset value before flowing into the first liquid inlet pipe section;

[0008] The conductivity probe is located in the liquid containing chamber and is used to detect the conductivity of the liquid in the liquid containing chamber.

[0009] In one embodiment, a plurality of pressure reducing members are provided between the first liquid inlet pipe section and the second liquid inlet pipe section, the pressure reducing member located at the head end is connected to the liquid outlet of the second liquid inlet pipe section, and the pressure reducing member located at the tail end is connected to the liquid inlet of the first liquid inlet pipe section;

[0010] The liquid in the second liquid inlet pipe section is configured to flow through the plurality of pressure reducing components in sequence and then enter the first liquid inlet pipe section.

[0011] In one embodiment, the pressure reducing component is a pressure reducing orifice plate.

[0012] In one embodiment, the conductivity detector includes a liquid inlet regulating valve, which is provided on the second liquid inlet pipe section and is used to regulate the flow of liquid flowing through the second liquid inlet pipe section.

[0013] In one embodiment, the liquid inlet regulating valve is a needle valve.

[0014] In one embodiment, the conductivity detector includes a liquid outlet pipe and a check valve, and the liquid inlet of the liquid outlet pipe is connected to the liquid outlet hole;

[0015] The check valve is provided on the liquid outlet pipe, and the check valve can open the liquid outlet pipe when the liquid to be detected flows out from the liquid outlet hole.

[0016] In one embodiment, the check valve is a swing check valve.

[0017] In one embodiment, the first liquid inlet pipe section and the second liquid inlet pipe section both extend along a first direction, and the first direction is the direction of gravity.

[0018] In one embodiment, the liquid outlet pipe includes a first liquid outlet pipe section and a second liquid outlet pipe section;

[0019] The first liquid outlet pipe section extends along a second direction, which is perpendicular to the first direction. The liquid inlet of the first liquid outlet pipe section is connected to the liquid outlet hole. The second liquid outlet pipe section extends along the first direction. A check valve is provided on the second liquid outlet pipe section. The liquid inlet of the second liquid outlet pipe section is connected to the liquid outlet of the first liquid outlet pipe section.

[0020] In one embodiment, the dimension of the first liquid inlet pipe section along the first direction is a first value, the dimension of the second liquid inlet pipe section along the first direction is a second value, and the sum of the first value and the second value is a third value;

[0021] A dimension of the second liquid outlet pipe section along the first direction is a fourth value, and the fourth value is less than or equal to the third value.

[0022] In the conductivity detector of this embodiment, the second liquid inlet pipe section transmits the liquid to be detected with a higher pressure to the pressure reducing component. The pressure reducing component reduces the pressure of the liquid to be detected to below the preset value, and transmits the liquid to be detected with a pressure below the preset value to the first liquid inlet pipe section. The liquid to be detected entering the first liquid inlet pipe section is transmitted from the liquid inlet hole to the liquid containing chamber, and is discharged from the shell from the liquid outlet hole after the conductivity is detected by the conductivity probe, and leaves the conductivity detector. In summary, by setting the pressure reducing component, the conductivity detector can reduce the liquid pressure of the liquid to be detected with a higher pressure that was previously undetectable and then measure it, thereby increasing the maximum value of the liquid pressure that can be detected by the conductivity detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of a conductivity detector in one embodiment of the present application.

[0024] Reference numerals:

[0025] Conductivity detector 100;

[0026] Housing 110, liquid chamber 111, liquid inlet 112, liquid outlet 113;

[0027] Liquid inlet pipe 120, first liquid inlet pipe section 121, second liquid inlet pipe section 122;

[0028] Pressure reducing member 130;

[0029] Conductivity probe 140;

[0030] Liquid inlet regulating valve 150;

[0031] Liquid outlet pipe 160, first liquid outlet pipe section 161, second liquid outlet pipe section 162;

[0032] Check valve 170. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0036] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0039] See also Figure 1 , Figure 1The present invention provides a schematic structural diagram of a conductivity detector in an embodiment of the present invention. A conductivity detector 100 provided in an embodiment of the present invention includes: a housing 110, a liquid inlet pipe 120, a pressure reducing member 130, and a conductivity probe 140. The housing 110 has a liquid chamber 111, a liquid inlet hole 112, and a liquid outlet hole 113. The liquid inlet hole 112 and the liquid outlet hole 113 are both connected to the liquid chamber 111. The liquid inlet pipe 120 includes a first liquid inlet pipe section 121 and a second liquid inlet pipe section 122. The first liquid inlet pipe section 121 is connected to the liquid chamber 111. The liquid outlet is connected to the liquid inlet hole 112, and the pressure reducing component 130 is arranged between the first liquid inlet pipe section 121 and the second liquid inlet pipe section 122. The first liquid inlet pipe section 121 and the second liquid inlet pipe section 122 are connected through the pressure reducing component 130. The liquid in the second liquid inlet pipe section 122 flows through the pressure reducing component 130, and the liquid pressure is reduced by the pressure reducing component 130 to less than a preset value before flowing into the first liquid inlet pipe section 121. The conductivity probe 140 is located in the liquid containing chamber 111, and the conductivity probe 140 is used to detect the conductivity of the liquid in the liquid containing chamber 111.

[0040] In the conductivity detector 100 in this embodiment, the second liquid inlet pipe section 122 transmits the liquid to be detected with a relatively high pressure to the pressure reducing component 130. The pressure reducing component 130 reduces the pressure of the liquid to be detected to below the preset value, and transmits the liquid to be detected with a pressure below the preset value to the first liquid inlet pipe section 121. The liquid to be detected entering the first liquid inlet pipe section 121 is transmitted from the liquid inlet hole 112 to the liquid containing chamber 111, and is discharged from the liquid outlet hole 110 after the conductivity is detected by the conductivity probe 140, leaving the conductivity detector 100. In summary, by providing the pressure reducing component 130, the conductivity detector 100 can reduce the liquid pressure of the liquid to be detected with a relatively high pressure that was previously undetectable and then measure it, thereby increasing the maximum value of the liquid pressure that can be detected by the conductivity detector 100.

[0041] Please continue reading Figure 1 In some embodiments, a plurality of pressure reducing components 130 connected in sequence are provided between the first liquid inlet pipe section 121 and the second liquid inlet pipe section 122. A pressure reducing component 130 located at the head end is connected to the liquid outlet of the second liquid inlet pipe section 122, and a pressure reducing component 130 located at the end is connected to the liquid inlet of the first liquid inlet pipe section 121. The liquid in the second liquid inlet pipe section 122 is configured to flow through the plurality of pressure reducing components 130 in sequence and then enter the first liquid inlet pipe section 121.

[0042] In this embodiment, the liquid to be tested, which has a relatively high pressure, in the second liquid inlet pipe section 122 flows sequentially through multiple pressure reducing elements 130. As the liquid to be tested passes through each pressure reducing element 130, the liquid pressure decreases to a certain extent until the liquid to be tested passes through the pressure reducing element 130 located at the end, at which point the liquid pressure of the liquid to be tested is reduced to below a preset value. Finally, the liquid is transmitted through the first liquid inlet pipe section 121 to the liquid containing chamber 111, where its conductivity is detected by the conductivity probe 140. By providing multiple pressure reducing elements 130, the liquid pressure of the liquid to be tested can be reduced to a greater extent, making it easier for the conductivity detector 100 to measure the liquid to be tested at a higher pressure after the pressure is reduced, further increasing the maximum detectable liquid pressure of the conductivity detector 100.

[0043] In some embodiments, the preset value is less than or equal to 15 bar.

[0044] Please continue reading Figure 1 In some embodiments, the pressure reducing member 130 is a pressure reducing orifice plate (not shown).

[0045] In this embodiment, by setting the pressure reducing member 130 as a pressure reducing orifice plate, on the one hand, the liquid pressure of the liquid to be detected can be reduced, and on the other hand, the flow rate of the liquid to be detected entering the first liquid inlet pipe section 121 can be limited. The specific reasons are as follows: the flow rate of the liquid to be detected when flowing through the pressure reducing orifice plate is related to the diameter of the through hole (not shown) on the pressure reducing orifice plate.

[0046] In some embodiments, a plurality of pressure reducing components 130 that are connected in sequence are arranged at intervals along the first direction, and the distance between any two adjacent pressure reducing components 130 in the first direction is equal.

[0047] In some embodiments, the axes of the through holes on any two adjacent pressure reducing members 130 (pressure reducing orifice plates) are located on the same straight line.

[0048] Please continue reading Figure 1 In some embodiments, the conductivity detector 100 includes a liquid inlet regulating valve 150 , which is disposed in the second liquid inlet pipe section 122 . The liquid inlet regulating valve 150 is used to regulate the flow of liquid flowing through the second liquid inlet pipe section 122 .

[0049] In this embodiment, when the conductivity detector 100 is working, the liquid inlet regulating valve 150 connects to the second liquid inlet pipe section 122, and the liquid to be detected flows through the second liquid inlet pipe section 122 into the pressure reducing component 130; when the conductivity detector 100 is not working, the liquid inlet regulating valve 150 closes the second liquid inlet pipe section 122, blocking the liquid to be detected outside the liquid inlet of the second liquid inlet pipe section 122, thereby preventing the liquid to be detected from entering the pressure reducing component 130.

[0050] Please continue reading Figure 1In some embodiments, the liquid inlet regulating valve 150 is a needle valve (not shown).

[0051] In this embodiment, by setting the liquid inlet regulating valve 150 as a needle valve, on the one hand, the second liquid inlet pipe section 122 can be opened and closed, and on the other hand, the liquid flow rate of the liquid to be detected flowing through the second liquid inlet pipe section 122 can be adjusted.

[0052] In some embodiments, the needle valve may be a common adjustable gate valve such as a manual stop valve (not shown) or a ball valve (not shown).

[0053] Please continue reading Figure 1 In some embodiments, the conductivity detector 100 includes a liquid outlet pipe 160 and a check valve 170, wherein the liquid inlet of the liquid outlet pipe 160 is connected to the liquid outlet hole 113; the check valve 170 is arranged on the liquid outlet pipe 160, and the check valve 170 can open the liquid outlet pipe 160 when the liquid to be detected flows out from the liquid outlet hole 113.

[0054] In this embodiment, when the conductivity detector 100 is in operation, after the conductivity of the liquid to be tested in the liquid containing chamber 111 is tested by the conductivity probe 140, the liquid to be tested enters the liquid outlet pipe 160 through the liquid outlet hole 113, flows through the check valve 170, and finally leaves the conductivity detector 100 through the liquid outlet of the liquid outlet pipe 160. Since the check valve 170 has unidirectional conductivity, the provision of the check valve 170 ensures that the liquid to be tested can only leave the conductivity detector 100 through the liquid outlet of the liquid outlet pipe 160, and cannot enter the liquid containing chamber 111 through the liquid outlet of the liquid outlet pipe 160. This prevents the tested liquid to be tested from flowing back into the liquid containing chamber 111 through the liquid outlet of the liquid outlet pipe 160 and mixing with the new liquid to be tested, thereby affecting the accuracy of the detection results of the conductivity probe 140.

[0055] It should be further explained that the staff can choose to connect the liquid outlet of the liquid outlet pipe 160 and the liquid inlet of the second liquid inlet pipe section 122 to the equipment containing the liquid to be tested as needed to improve the utilization rate of the liquid to be tested and reduce the waste of the liquid to be tested.

[0056] Please continue reading Figure 1 In some embodiments, the check valve 170 is a swing check valve (not shown).

[0057] In this embodiment, the liquid to be tested in the liquid chamber 111, whose conductivity has been tested by the conductivity probe 140, enters the liquid outlet pipe 160 from the liquid outlet hole 113. The liquid to be tested entering the liquid outlet pipe 160 pushes the valve of the swing check valve to open, and finally exits the conductivity detector 100 through the liquid outlet of the liquid outlet pipe 160. By setting the check valve 170 as a swing check valve, the cost of preventing liquid backflow of the conductivity detector 100 can be reduced.

[0058] In some embodiments, the check valve 170 may be a common valve such as a vertical lift check valve, a horizontal lift check valve, or a butterfly check valve.

[0059] Please continue reading Figure 1 In some embodiments, the first liquid inlet pipe section 121 and the second liquid inlet pipe section 122 both extend along a first direction, which is the direction of gravity.

[0060] In this embodiment, by setting the first liquid inlet pipe section 121 and the second liquid inlet pipe section 122 to extend along the direction of gravity, the liquid to be detected can flow through the first liquid inlet pipe section 121 and the second liquid inlet pipe section 122 in sequence under the action of its own gravity, and finally enter the liquid containing chamber 111, thereby reducing the use of a water pump (not shown) and reducing the production cost of the conductivity detector 100.

[0061] In some embodiments, the conductivity probe 140 extends along a first direction. By setting the extension direction of the conductivity probe 140 to be the same as the extension direction of the second liquid inlet pipe section 122, the extension direction of the conductivity probe 140 can be made collinear with the flow direction of the liquid to be tested in the second liquid inlet pipe section 122, thereby ensuring that the liquid to be tested is in full contact with the conductivity probe 140, thereby improving the accuracy of the detection results of the conductivity probe 140.

[0062] Please continue reading Figure 1 In some embodiments, the liquid outlet pipe 160 includes a first liquid outlet pipe section 161 and a second liquid outlet pipe section 162. The first liquid outlet pipe section 161 extends along the second direction, which is perpendicular to the first direction. The liquid inlet of the first liquid outlet pipe section 161 is connected to the liquid outlet hole. The second liquid outlet pipe section 162 extends along the first direction. A check valve 170 is provided on the second liquid outlet pipe section 162. The liquid inlet of the second liquid outlet pipe section 162 is connected to the liquid outlet of the first liquid outlet pipe section 161.

[0063] In this embodiment, after the conductivity of the liquid to be tested in the liquid chamber 111 is tested by the conductivity probe 140, it enters the first liquid outlet pipe section 161. The liquid to be tested that enters the first liquid outlet pipe section 161 enters the second liquid outlet pipe section 162, flows through the check valve 170, and finally leaves the conductivity detector 100 from the liquid outlet of the second liquid outlet pipe section 162. Since the first liquid inlet pipe section 121 is connected to the liquid inlet hole 112, the first liquid outlet pipe section 161 is connected to the liquid outlet hole 113, and the second liquid outlet pipe section 162 is connected to the first liquid outlet pipe section 161, the second liquid outlet pipe section 162 and the first liquid inlet pipe section 121 all extend along the first direction. Therefore, the first liquid inlet pipe section 121, the first liquid outlet pipe section 161, and the second liquid outlet pipe section 162 together form a communicating vessel, that is, the liquid to be detected will automatically enter the first liquid outlet pipe section 161 from the liquid containing chamber 111 and leave the conductivity detector 100 through the second liquid outlet pipe section 162. Due to the above-mentioned communicating vessel structure, the conductivity detector 100 does not need to be equipped with a water pump to extract the liquid to be detected from the liquid containing chamber 111, thereby reducing the production cost of the conductivity detector 100.

[0064] In some embodiments, the diameter of the first liquid outlet pipe section 161 is equal to the diameter of the second liquid outlet pipe section 162 .

[0065] In some embodiments, the conductivity detector 100 includes a water pump, which is disposed between the first liquid outlet pipe section 161 and the second liquid outlet pipe section 162. The liquid inlet of the water pump is connected to the liquid outlet of the first liquid outlet pipe section 161, and the liquid outlet of the water pump is connected to the liquid inlet of the second liquid outlet pipe section 162. By providing the water pump, the liquid to be tested can be pumped out of the liquid containing chamber 111, ensuring that the liquid to be tested leaves the liquid containing chamber 111 in a timely manner after the conductivity probe 140 has completed the conductivity test, so that the conductivity probe 140 can perform subsequent tests on the liquid to be tested.

[0066] In some embodiments, the diameter of the first liquid outlet pipe section 161 is greater than the diameter of the second liquid outlet pipe section 162 .

[0067] Please continue reading Figure 1 In some embodiments, the dimension of the first liquid inlet pipe section 121 along the first direction is a first value, the dimension of the second liquid inlet pipe section 122 along the first direction is a second value, and the sum of the first value and the second value is a third value; the dimension of the second liquid outlet pipe section 162 along the first direction is a fourth value, and the fourth value is less than or equal to the third value.

[0068] In this embodiment, by setting the length of the second liquid outlet pipe section 162 to be less than or equal to the sum of the lengths of the first liquid inlet pipe section 121 and the second liquid inlet pipe section 122, the liquid inlet of the second liquid inlet pipe section 122 can be located above the liquid outlet of the second liquid outlet pipe section 162, thereby ensuring that when the conductivity detector 100 is working, the liquid chamber 111 is filled with the liquid to be detected, thereby improving the accuracy of the detection results of the conductivity probe 140.

[0069] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A conductivity detector, characterized in that: include: The housing comprises a liquid containing chamber, a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are both connected to the liquid containing chamber; a liquid inlet pipe, comprising a first liquid inlet pipe section and a second liquid inlet pipe section, wherein the liquid outlet of the first liquid inlet pipe section is connected to the liquid inlet hole; a pressure reducing member disposed between the first liquid inlet pipe section and the second liquid inlet pipe section, the first liquid inlet pipe section and the second liquid inlet pipe section being connected via the pressure reducing member, the liquid in the second liquid inlet pipe section flowing through the pressure reducing member and having its pressure reduced to less than a preset value before flowing into the first liquid inlet pipe section; The conductivity probe is located in the liquid containing chamber and is used to detect the conductivity of the liquid in the liquid containing chamber.

2. The conductivity detector according to claim 1, characterized in that A plurality of pressure reducing components are provided between the first liquid inlet pipe section and the second liquid inlet pipe section, wherein the pressure reducing component at the head end is connected to the liquid outlet of the second liquid inlet pipe section, and the pressure reducing component at the tail end is connected to the liquid inlet of the first liquid inlet pipe section; The liquid in the second liquid inlet pipe section is configured to flow through the plurality of pressure reducing components in sequence and then enter the first liquid inlet pipe section.

3. The conductivity detector according to claim 1 or 2, characterized in that The pressure reducing component is a pressure reducing orifice plate.

4. The conductivity detector according to claim 1, wherein The conductivity detector includes a liquid inlet regulating valve, which is arranged on the second liquid inlet pipe section and is used to regulate the liquid flow passing through the second liquid inlet pipe section.

5. The conductivity detector according to claim 4, characterized in that The liquid inlet regulating valve is a needle valve.

6. The conductivity detector according to claim 1, characterized in that The conductivity detector includes a liquid outlet pipe and a check valve, wherein the liquid inlet of the liquid outlet pipe is connected to the liquid outlet hole; The check valve is provided on the liquid outlet pipe, and the check valve can open the liquid outlet pipe when the liquid to be detected flows out from the liquid outlet hole.

7. The conductivity detector according to claim 6, characterized in that The check valve is a swing check valve.

8. The conductivity detector according to claim 6, characterized in that The first liquid inlet pipe section and the second liquid inlet pipe section both extend along a first direction, and the first direction is the direction of gravity.

9. The conductivity detector according to claim 8, characterized in that The liquid outlet pipe includes a first liquid outlet pipe section and a second liquid outlet pipe section; The first liquid outlet pipe section extends along a second direction, which is perpendicular to the first direction. The liquid inlet of the first liquid outlet pipe section is connected to the liquid outlet hole. The second liquid outlet pipe section extends along the first direction. A check valve is provided on the second liquid outlet pipe section. The liquid inlet of the second liquid outlet pipe section is connected to the liquid outlet of the first liquid outlet pipe section.

10. The conductivity detector according to claim 9, characterized in that The dimension of the first liquid inlet pipe section along the first direction is a first value, the dimension of the second liquid inlet pipe section along the first direction is a second value, and the sum of the first value and the second value is a third value; A dimension of the second liquid outlet pipe section along the first direction is a fourth value, and the fourth value is less than or equal to the third value.

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