Saline water liquid level composite detection device

Abstract

The utility model discloses a salt water liquid level composite detection device which comprises a shell, a middle rod which at least penetrates through one end of the shell and is fixed in the shell, a concentration detection module which is arranged at the upper part of the middle rod, and a concentration detection module which is arranged at the lower part of the middle rod, a water inlet hole is formed in the lower part of the shell; the shell is of a cylindrical structure. Based on the physical characteristics of saline water, the concentration and concentration composite detection function is realized through a simple structure, compact matching and reasonable design, and meanwhile, the influence of salt block particles on normal detection is avoided.

Description

Technical field

[0001] The utility model relates to a concentration detection device, in particular to a salt water level composite detection device. [Background Technology]

[0002] As living standards improve, people's expectations for quality of life continue to rise, leading to a gradual increase in dishwasher awareness and acceptance. A water softener is a key component of a dishwasher. As the name suggests, it softens water. When water hardness exceeds 60 ppm, scale easily forms on the dishwasher's walls and electrical components. Over time, the accumulated scale thickens, significantly reducing the lifespan of the components. This reduces the dishwasher's performance and the cleanliness of dishwashing. Therefore, dishwashers require soft water. A water softener uses a resin to absorb calcium and magnesium ions from the water, then regenerates the resin with salt to soften the water. The container for holding brine is a brine tank. When the brine concentration decreases, its regeneration ability decreases, and the user needs to be reminded to add salt. Currently, the brine concentration and liquid level detection alarm device in the brine tank is relatively complex. The conductivity method is used. Since the conductivity of salt (NaCl) is higher than that of other substances, the salt concentration is determined by measuring the conductivity, and the brine level is determined by detecting the position of the float. This detection method is set inside the brine tank and requires the installation of multiple sensors. It is very inconvenient during production and installation, and the production cost is high.

[0003] Currently, when users add salt, salt blocks often get stuck on the float, affecting the normal monitoring of the liquid level and making it very inconvenient for users to use. [Utility Model Content]

[0004] In order to solve at least one of the above problems, the present invention proposes a new structural solution. The present salt water level composite detection device adopts the following technical solutions:

[0005] A composite salt water level detection device comprises a housing, a central rod extending through at least one end of the housing and fixed in a receiving cavity enclosed by the housing, a liquid level detection module disposed at an upper portion of the central rod, and a concentration detection module disposed at a lower portion of the central rod; an exhaust hole is disposed at an upper portion of the housing and a water inlet hole is disposed at a lower portion of the housing; and the housing is cylindrical in structure.

[0006] Preferably, the liquid level detection module includes a first floating member, which can reciprocate along the middle rod and is provided with an identification member; a first limiting member, at least two first limiting members are arranged on the upper and lower sides of the first floating member and fixed on the middle rod; a liquid level detection sensor, which is arranged at a position close to the first limiting member and can detect the identification member in the first floating member; the concentration detection module includes a second floating member, which can reciprocate along the middle rod and is provided with an identification member; a second limiting member, at least two second limiting members are arranged on the upper and lower sides of the second floating member and fixed on the middle rod; and a concentration detection sensor, which is arranged at a position close to the second limiting member and can detect the identification member in the second floating member.

[0007] Preferably, it also includes an anti-sticking part, which is arranged between the first floating part and the first limiting part and forms a gap between the first floating part and the first limiting part, and the anti-sticking part is arranged between the second floating part and the second limiting part and forms a gap between the second floating part and the second limiting part.

[0008] Preferably, the air vent is provided above the liquid level detection module; and the water inlet is provided below the concentration detection module.

[0009] Preferably, the first limiting member and the second limiting member are a retaining spring, a retaining ring or an open retaining ring; the middle rod is provided with a plurality of mounting grooves, and the first limiting member and the second limiting member are respectively fixed in the mounting grooves.

[0010] Preferably, the anti-sticking member is a plurality of protrusions and is respectively arranged on the surfaces of the first floating member, the first limiting member, the second floating member, and the second limiting member.

[0011] Preferably, the identification member is made of magnetic material, the liquid level detection sensor is arranged on the first limit member and / or in the middle rod, and the concentration detection sensor is arranged on the second limit member and / or in the middle rod.

[0012] Preferably, the center pole also includes a signal transmission line, which is led out from the top of the center pole and electrically connected to the control module; a mounting portion, which passes through the shell and can be detachably connected to the mounting base; a fastener, which is arranged on the mounting portion and is used to fix the shell; and a seal, which is arranged between the shell and the fastener.

[0013] Preferably, the outer shell further comprises a cylindrical shell and a lower sealing cover sleeved on the lower end of the cylindrical shell, and the water inlet hole is arranged on the cylindrical shell and / or on the lower sealing cover.

[0014] Preferably, the materials of the first floating member and the second floating member are rigid polyurethane foam, PVC rigid foam, polystyrene foam, epoxy resin rigid closed-cell foam or composite foam; the material density of the first floating member is less than 1.12 g / cm 3 The material density of the second floating member is greater than 1g / cm3 And less than 1.12g / cm 3 .

[0015] Compared with the background technology, the utility model has the following beneficial effects:

[0016] This utility model relates to a composite brine level detection device. This structure avoids the need for multiple sensors in the brine tank, requiring only a single detection device to detect both brine concentration and level. This also prevents the addition of salt blocks to the brine tank from affecting the normal operation of the float. Furthermore, it shortens the production process, reduces unnecessary production steps, and improves production and assembly efficiency. This structure offers advantages such as simplicity, compactness, and rational design; therefore, it is a product with superior technical and economic performance.

Brief Description of the Drawings

[0017] Figure 1 This is a schematic structural diagram of the brine level composite detection device of the present utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of explosion of the brine level composite detection device shown;

[0019] Figure 3 for Figure 2 A magnified schematic diagram of part A in the middle;

[0020] Figure 4 for Figure 1 Schematic cross-sectional view along the BB direction.

[0021] Indicated in the attached drawings: 1. Outer shell, 11. Upper cover, 12. Cylinder shell, 121. Exhaust hole, 13. Lower cover, 131. Water inlet, 2. Middle rod, 21. Fastener, 22. Mounting groove, 23. Mounting part, 24. Sealing part, 25. Signal transmission line, 3. Liquid level detection module, 31. First limiter, 32. First floating part, 33. Liquid level detection sensor, 4. Concentration detection module, 41. Second limiter, 42. Second floating part, 43. Concentration detection sensor, 5. Identification part, 6. Anti-sticking part. [Specific implementation method]

[0022] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions.

[0023] In this utility model, unless otherwise specified or limited, the terms "assemble," "connect," and "connect" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection; direct connection, connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] The following description of the embodiments of the present invention is provided in conjunction with the accompanying drawings to further describe the specific embodiments of the present invention so that the technical solutions and beneficial effects of the present invention are more clearly understood. The following description of the embodiments with reference to the accompanying drawings is for illustrative purposes only and is intended to explain the present invention, but is not to be construed as limiting the present invention.

[0025] The preferred embodiment provided by the present invention is as follows: Figures 1 to 4 As shown, a salt water level composite detection device includes a housing 1, a center rod 2 that passes through at least one end of the housing 1 and is fixed in a receiving cavity surrounded by the housing 1, a liquid level detection module 3 arranged at an upper position of the center rod 2, and a concentration detection module 4 arranged at a lower position of the center rod 2; an exhaust hole 121 is provided at the upper portion of the housing 1 and a water inlet hole 131 is provided at the lower portion of the housing 1; the housing 1 has a cylindrical structure. In this embodiment, the middle rod 2, the liquid level detection module 3 and the concentration detection module 4 are all arranged in the shell 1, thereby preventing the salt block from accidentally getting stuck in the liquid level detection module 3 and / or the concentration detection module 4 when the user adds salt blocks; the brine solution in the brine tank can enter the accommodating cavity surrounded by the shell 1 through the water inlet hole 131 of the shell 1 and contact the liquid level detection module 3 and the concentration detection module 4; the exhaust hole 121 on the shell 1 makes the air pressure in the accommodating cavity equal to the air pressure in the brine tank, so that the liquid level of the brine solution in the accommodating cavity of the shell 1 is the same as the liquid level of the brine solution in the brine tank, thereby achieving the goal of respectively detecting and judging whether the liquid level height of the brine solution in the brine tank has reached a preset position through the liquid level detection module 3 in the present brine liquid level composite detection device and detecting and judging whether the concentration of the brine solution in the brine tank has reached a preset concentration value through the concentration detection module 4.

[0026] In an optional embodiment, the housing 1 may be a mesh structure. In this embodiment, the mesh pore size is required to be smaller than the particle size of the salt block to avoid the salt block from getting stuck in the liquid level detection module 3 and / or the concentration detection module 4.

[0027] In an optional embodiment, the middle rod 2 can pass through both ends of the outer shell 1 and be fixed by bolts or buckles.

[0028] Furthermore, the center pole 2 includes a signal transmission line 25, which extends from the top of the center pole 2 and is electrically connected to the control module; a mounting portion 23, which extends through the housing 1 and protrudes from the housing 1. The mounting portion 23 is removably connected to the mounting base of the brine tank (not shown); a fastener 21, which is disposed on the mounting portion 23 and is used to secure the housing 1; and a seal 24, which is disposed between the housing 1 and the fastener 21. In this embodiment, one end of the center pole 2 extends through and protrudes from the housing 1. The housing 1 is clamped to the mounting portion 23 of the center pole 2 by a plurality of fasteners 21. In this embodiment, the fasteners 21 can all be nuts, and the mounting portion 23 has a threaded structure. The fasteners 21 and the mounting portion 23 are threadedly connected to secure the housing 1. In alternative embodiments, the fasteners 21 can be partially nut-shaped and partially protruded from the center pole 2. The housing 1 is supported on the protruded structure, and the fasteners 21 and the mounting portion 23 are threadedly connected to secure the housing 1.

[0029] In this embodiment, after the fastener 21 fixes the housing 1 to the middle pole 2, the mounting portion 23 still has a structure that is detachably connected to the mounting base (not shown in the drawings). Specifically, the mounting portion 23 has a threaded structure, and the mounting portion 23 is threadedly connected to the mounting base (not shown in the drawings). The signal transmission line 25 is led out from the top of the mounting portion 23 of the middle pole 2. After the middle pole 2 is fixedly connected to the mounting base (not shown in the drawings), the signal transmission line 25 is electrically connected to the control module, and the control module is used to receive signals sent by the liquid level detection module 3 and the concentration detection module 4. At least one seal 24 is also provided between the housing 1 and the fastener 21. The seal 24 is used to prevent the saline solution from overflowing from the structural gap between the mounting portion 23 and other components under special working conditions where the equipment is moved or overturned.

[0030] The sealing member 24 can be a sealing rubber ring. In an optional embodiment, a sealing member 24 is provided on both sides of the housing 1 , and two fasteners 21 are respectively fastened and clamped on the outside of the sealing member 24 to clamp and fix the housing 1 .

[0031] Furthermore, the vent 121 is located above the liquid level detection module 3. This is primarily to prevent the vent 121 from interfering with the detection function of the liquid level detection module 3. Since the housing 1 has a relatively closed chamber, if the vent 121 were located below the liquid level detection module 3, saline solution would enter the chamber through the water inlet 131, creating an air cavity above the liquid level detection module 3. This would prevent the saline solution from contacting the liquid level detection module 3, making it impossible to determine whether the saline solution has reached the preset level. The water inlet 131 is located below the concentration detection module 4. This ensures that the saline solution completely immerses the concentration detection module 4 and prevents saline solution from stagnating in the chamber near the concentration detection module 4, potentially affecting the concentration detection results. Furthermore, since salt lumps fall to the bottom of the saline tank and conventional saline tanks lack agitation, the concentration of the saline solution gradually decreases from bottom to top. Therefore, placing the concentration detection module 4 at the lower portion of the center rod 2 ensures that the saline concentration detected by the concentration detection module 4 is closer to the actual concentration of the saline solution.

[0032] Furthermore, the housing 1 includes a cylindrical shell 12 and a lower cover 13 mounted on the lower end of the cylindrical shell 12. A water inlet 131 is provided on the cylindrical shell 12 and / or the lower cover 13. In this embodiment, the lower cover 13 is mounted on the lower end of the housing 1. The water inlet 131 can be provided on the cylindrical shell 12, the lower cover 13, or both. As long as the water inlet 131 is located below the concentration detection module 4, the function of detecting and determining the salt water concentration can be achieved.

[0033] In an optional embodiment, the shell 1 further includes an upper cover 11. The cylindrical shell 12 has a tubular structure, and the upper cover 11 and the lower cover 13 have a round cap-shaped structure. The upper cover 11 and the lower cover 13 are respectively sleeved on both ends of the cylindrical shell 12. The purpose of providing the upper cover 11 and the lower cover 13 in this embodiment is to reduce the difficulty of manufacturing structural accessories. During production, the structure of the shell 1 is usually manufactured using a die-casting or injection molding process. However, the above two processes have special requirements for the structure of the molding object. Therefore, in order to cooperate with the manufacturing process, the shell 1 in this embodiment includes an upper cover 11, a lower cover 13, and a cylindrical shell 12.

[0034] In an optional embodiment, the housing 1 may also be composed of a left housing and a right housing. The left housing and the right housing are detachably connected. The detachable connection may be a snap connection, a bolt connection, a screw connection, etc.

[0035] Furthermore, the liquid level detection module 3 includes a first floating member 32 that can reciprocate along the center rod 2 and is equipped with an identification member 5; at least two first stoppers 31 are disposed on the upper and lower sides of the first floating member 32 and fixed to the center rod 2; a liquid level detection sensor 33 is disposed near the first stoppers 31 and can detect the identification member 5 in the first floating member 32; and a concentration detection module 4 includes a second floating member 42 that can reciprocate along the center rod 2 and is equipped with an identification member 5; at least two second stoppers 41 are disposed on the upper and lower sides of the second floating member 42 and fixed to the center rod 2; and a concentration detection sensor 43 is disposed near the second stoppers 41 and can detect the identification member 5 in the second floating member 42. In this embodiment, the first floating member 32 can rise or fall on the center rod 2 due to changes in the liquid level of the brine solution, and the second floating member 42 can rise or fall on the center rod 2 due to changes in the concentration of the brine solution. Both the first and second floating members 32 and 42 are equipped with an identification member 5, which can be embedded or externally mounted within the first and second floating members 32 and 42. The internally embedded identification member 5 can be inserted into each of the first and second floating members 32 and 42 during manufacturing, or the first and second floating members 32 and 42 can be separated into at least two components, each with a mounting space for the identification member 5. Later, the two components and the identification member 5 are assembled and combined into a single unit by a worker. The externally mounted identification member 5 can have a mounting space for the identification member 5 formed on the surface of the first and second floating members 32 and 42, and the identification member 5 can be fixedly connected to the first and second floating members 32 and 42, respectively, to form a single unit. The connection can be adhesive, snap-fit, screw, or other methods. The externally mounted identification member 5 can be located on the top surface or outer periphery of the first and / or second floating members 32 and 42. The liquid level detection sensor 33 and the concentration detection sensor 43 are respectively configured to detect and determine the position of the corresponding identification member 5 and transmit a position signal of the identification member 5 to the control module.

[0036] First stoppers 31 are disposed above and below the first floating member 32. The upper first stopper 31 is used to limit the maximum buoyancy of the first floating member 32, thereby defining the maximum level of the solution stored in the brine tank. The lower first stopper 31 is used to limit the initial position of the first floating member 32. In this embodiment, since both the first stopper 31 and the second stopper 41 are disposed on the center rod 2, the lower first stopper 31 must be higher than either second stopper 41 to prevent interference between the first and second floating members 32, 42.

[0037] Second stoppers 41 are positioned above and below the second floating member 42. In saline solutions of varying concentrations, the suspended position of the second floating member 42 is calibrated on the center rod 2, allowing the concentration sensor 43 to detect and determine whether the saline solution has reached a preset concentration value. The upper second stopper 41 is positioned at the position corresponding to the maximum saline concentration detected by the concentration sensor 43. When the second floating member 42 moves to the upper second stopper 41, the concentration sensor 43 detects and determines that the saline solution has reached its maximum concentration value.

[0038] Furthermore, the identification member 5 is made of a magnetic material. The liquid level detection sensor 33 is disposed on the first stopper 31 and / or within the middle rod 2, and the concentration detection sensor 43 is disposed on the second stopper 41 and / or within the middle rod 2. In this embodiment, the identification member 5 may be a magnet. The liquid level detection sensor 33 and the concentration detection sensor 43 are Hall effect sensors that can detect the position of the identification member 5 by detecting changes in magnetic field strength. In this embodiment, the liquid level detection sensor 33 and the concentration detection sensor 43 are both disposed within the middle rod 2. The liquid level detection sensor 33 can determine whether the brine solution in the brine tank has reached a preset level by detecting the position of the identification member 5. The concentration detection sensor 43 can detect and determine whether the concentration of the brine solution in the brine tank has reached a preset concentration. The liquid level detection sensor 33 and the concentration detection sensor 43 are disposed at positions on the first stopper 31 and the second stopper 41 corresponding to the positions on the middle rod 2, respectively.

[0039] In an optional embodiment, the liquid level sensor 33 and the concentration sensor 43 are respectively mounted on the first stopper 31 and the second stopper 41. This is primarily intended to reduce the difficulty in manufacturing the center rod 2. Manual attachment of the liquid level sensor 33 and the concentration sensor 43 to the first stopper 31 and the second stopper 41 is possible, respectively. This also allows for the position detection of the identification element 5 within the first and second floating members 32 and 42. In other optional embodiments, the mounting locations of the liquid level sensor 33 and the concentration sensor 43 can be combined depending on the specific situation. They can be mounted on either the first stopper 31 or the second stopper 41, or on the center rod 2.

[0040] Furthermore, the materials of the first floating member 32 and the second floating member 42 are hard polyurethane foam, PVC hard foam, polystyrene foam, epoxy resin hard closed-cell foam or composite foam material; the material density of the first floating member 32 is less than 1.12g / cm 3 The material density of the second floating member 42 is greater than 1g / cm 3 And less than 1.12g / cm 3In this embodiment, the materials of the first floating member 32 and the second floating member 42 are both materials that can float in a saline solution. Since the first floating member 32 is part of the liquid level detection module 3, its purpose is to assist other structures in detecting the liquid level of the saline solution; the first floating member 32 needs to have the function of floating in saline solutions of different concentrations. Therefore, the density of the first floating member 32 needs to be at least less than the density of saturated saline solution. At room temperature of 20°C, the density of saline solution in a saturated state is 1.12 g / cm 3 Therefore, the density of the first floating member 32 needs to be at least less than 1.12 g / cm 3 .

[0041] Since the second float 42 is part of the concentration detection module 4 and serves to assist other components in detecting the concentration of the brine, it must be able to float in brine of varying concentrations. When the brine concentration is zero, the solution in the brine tank is water. Therefore, the density of the second float 42 must be at least less than that of saturated brine and greater than that of water. At room temperature (20°C), the density of saturated brine is 1.12 g / cm². 3 And the density of water is 1g / cm 3 Therefore, the density of the second floating member 42 needs to be less than 1.12 g / cm 3 And greater than 1g / cm 3 .

[0042] Furthermore, the first and second limiting members 31 and 41 are configured as retaining springs, snap rings, or open retaining rings; the center rod 2 is provided with a plurality of mounting grooves 22, into which the first and second limiting members 31 and 41 are respectively secured. In this embodiment, the center rod 2 is provided with four mounting grooves 22, each of which is an annular groove structure. The first and second limiting members 31 and 41 are configured as semi-open retaining springs, snap rings, or open retaining rings. The center rod 2 is provided with mounting grooves 22 that mate with the first and second limiting members 31 and 41. The annular groove structure of the mounting grooves 22 limits the vertical displacement of the first and second limiting members 31 and 41.

[0043] Furthermore, the device further includes an anti-sticking member 6. The anti-sticking member 6 is disposed between the first floating member 32 and the first stopper 31, creating a gap between the first floating member 32 and the first stopper 31. The anti-sticking member 6 is also disposed between the second floating member 42 and the second stopper 41, creating a gap between the second floating member 42 and the second stopper 41. In this embodiment, the anti-sticking member 6 is used to prevent the first floating member 32 from sticking to the first stopper 31, or the second floating member 42 from sticking to the second stopper 41. Sticking occurs because when the stopper and the floating member abut, the buoyancy of the saline solution on the floating member causes the saline solution between the stopper and the floating member to be displaced due to the relatively smooth contact surfaces. When the saline solution decreases to expose the stopper and the floating member, atmospheric pressure creates a negative pressure zone between the stopper and the floating member, causing the stopper and the floating member to stick together, preventing the floating member from moving downward as the saline solution decreases.

[0044] In some embodiments, the anti-sticking member 6 can be set as a rough surface structure on the two opposite surfaces of the limiting member and the floating member. The purpose is to create an air channel between the limiting member and the floating member through the rough surface structure, so that the two opposite surfaces of the limiting member and the floating member cannot be completely tightly fitted, thereby preventing the two from being affected by other resistances when separated.

[0045] The aforementioned limiting member includes a first limiting member 31 and a second limiting member 41 , and the aforementioned floating member includes a first floating member 32 and a second floating member 42 .

[0046] Furthermore, the anti-sticking member 6 is a plurality of protrusions and is respectively arranged on the surfaces of the first floating member 32, the first limiting member 31, the second floating member 42, and the second limiting member 41. In this embodiment, three protrusions are respectively provided on the two surfaces opposite to the first limiting member 31 of the first floating member 32. The protrusion of the first floating member 32 and the protrusion of the first limiting member 31 are not on the same vertical axis. The purpose is to form an effective gap between the first floating member 32 and the first limiting member 31, while also avoiding the gap being too large to affect the detection effect of the liquid level sensor. The protrusion structure arranged on the surface of the second floating member 42 and the second limiting member 41 can be set with reference to the design form of the protrusion structure of the first floating member 32 and the first limiting member 31.

[0047] In some embodiments, the raised structure can be provided on one of the two opposing surfaces of the first floating member 32 and the first stopper 31, and this arrangement can also achieve substantially the same effect. The raised structure provided on the surfaces of the second floating member 42 and the second stopper 41 can be provided with reference to the design of the raised structure of the first floating member 32 and the first stopper 31.

[0048] In some embodiments, the raised structure is hemispherical and can abut against the surface of the stopper or floating member with minimal contact area, thereby effectively reducing the resistance generated when the stopper and floating member separate. The above-mentioned stopper includes a first stopper 31 and a second stopper 41, and the above-mentioned floating member includes a first floating member 32 and a second floating member 42.

[0049] In the description of the specification, reference to the terms "one embodiment," "preferably," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. The schematic expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0050] Through the description of the above structure and principle, technical personnel in the relevant technical field should understand that the present invention is not limited to the above specific implementation methods, and improvements and substitutions based on the present invention using the well-known technology in the field all fall within the scope of protection of the present invention and should be defined by the claims.

Claims

1. A salt water level composite detection device, characterized in that: It includes a shell, a middle rod that passes through at least one end of the shell and is fixed in a accommodating cavity surrounded by the shell, a liquid level detection module arranged at the upper position of the middle rod, and a concentration detection module arranged at the lower position of the middle rod; the upper part of the shell is provided with an exhaust hole and the lower part of the shell is provided with a water inlet hole; the shell has a cylindrical structure.

2. A salt water level composite detection device according to claim 1, characterized in that: The liquid level detection module includes a first floating member, which can reciprocate along the middle rod and is provided with an identification member; a first limiting member, at least two of which are arranged on upper and lower sides of the first floating member and fixed to the middle rod; and a liquid level detection sensor, which is arranged near the first limiting member and can detect the identification member in the first floating member. The concentration detection module includes a second floating member, which can reciprocate along the middle rod and is provided with an identification member; a second limiting member, at least two of which are arranged on the upper and lower sides of the second floating member and fixed on the middle rod; and a concentration detection sensor, which is arranged at a position close to the second limiting member and can detect the identification member in the second floating member.

3. The salt water level composite detection device according to claim 2, characterized in that: It also includes an anti-sticking member, which is arranged between the first floating member and the first limiting member and forms a gap between the first floating member and the first limiting member. The anti-sticking member is arranged between the second floating member and the second limiting member and forms a gap between the second floating member and the second limiting member.

4. A salt water level composite detection device according to claim 1 or 2, characterized in that: The air vent is arranged above the liquid level detection module; and the water inlet is arranged below the concentration detection module.

5. A salt water level composite detection device according to claim 2 or 3, characterized in that: The first limiting member and the second limiting member are a retaining spring, a retaining ring or an open retaining ring; The middle rod is provided with a plurality of mounting grooves, and the first limiting member and the second limiting member are respectively fixed in the mounting grooves.

6. The salt water level composite detection device according to claim 3, characterized in that: The anti-sticking member is a plurality of protrusions and is respectively arranged on the surfaces of the first floating member, the first limiting member, the second floating member, and the second limiting member.

7. A salt water level composite detection device according to any one of claims 2, 3 and 6, characterized in that: The identification member is made of magnetic material, the liquid level detection sensor is arranged on the first limit member and / or in the middle rod, and the concentration detection sensor is arranged on the second limit member and / or in the middle rod.

8. A salt water level composite detection device according to any one of claims 2, 3 and 6, characterized in that: The center pole further includes a signal transmission line extending from the top of the center pole and electrically connected to the control module; a mounting portion extending through the housing and detachably connected to the mounting base; and a fastener disposed on the mounting portion for securing the housing. A seal is provided between the housing and the fastener.

9. The salt water level composite detection device according to claim 4, characterized in that: The outer shell further comprises a cylindrical shell and a lower sealing cover sleeved on the lower end of the cylindrical shell, and the water inlet hole is arranged on the cylindrical shell and / or on the lower sealing cover.

10. A salt water level composite detection device according to any one of claims 2, 3 and 6, characterized in that: The first floating member and the second floating member are made of rigid polyurethane foam, PVC rigid foam, polystyrene foam, epoxy resin rigid closed-cell foam or composite foam material; The material density of the first floating member is less than 1.12 g / cm 3 ; The material density of the second floating member is greater than 1g / cm 3 And less than 1.12g / cm 3 .

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