Floating ball liquid level sensing mechanism and device

Abstract

The invention relates to the technical field of liquid level detection, and particularly discloses a floating ball liquid level sensing mechanism which comprises a guide rod assembly and a floating ball assembly. The guide rod assembly comprises a guide rod body and a first annular magnet. The first annular magnet is installed on the guide rod body and is coaxial with the guide rod body. The floating ball assembly comprises a floating ball body and a second annular magnet, the periphery of the guide rod body is sleeved with the floating ball body, the floating ball body can move in the axial direction of the guide rod body, the second annular magnet is installed on the floating ball body, and the second annular magnet and the first annular magnet are coaxially arranged; wherein the magnetic poles of the close ring surfaces of the first annular magnet and the second annular magnet are the same. The invention further discloses a floating ball liquid level sensing device. By means of the principle that like magnetic poles repel each other, the floating ball body and the guide rod body can always keep a fixed-distance separation state in the radial direction during relative sliding, and therefore the problem of floating ball bonding caused by attachment of the floating ball assembly and the guide rod assembly is completely eradicated.

Description

Technical Field

[0001] The invention relates to the technical field of liquid level detection, and in particular to a float liquid level sensing mechanism and device. Background Art

[0002] In traditional float-type liquid level sensors, the float can move along the axial direction of the guide rod and there is no movement constraint between the float and the guide rod in the radial direction, which easily leads to the float and the guide rod being fitted together. In the application environment facing liquids with high viscosity, because there is no movement constraint between the float and the guide rod in the radial direction, when the float and the guide rod are fitted together in the radial direction, the liquid tension and viscosity will cause the interaction force between the float and the guide rod to increase, thereby affecting the sensing accuracy of the liquid level sensor. In addition, when the liquid in the container stays at a low liquid level for a long time, the part of the float and the guide rod exposed to the liquid surface will lose the moisturizing effect of the liquid. At this time, if the float and the guide rod are fitted, the liquid adsorbed there will easily volatilize and solidify, causing the float and the guide rod to stick together, causing the liquid level sensing function to completely fail. If the float and the guide rod stick together and cause the device to fail, it is necessary to manually clean and wipe the guide rod and the float, which is time-consuming and labor-intensive. Summary of the invention

[0003] The technical problem to be solved by the present invention is: how to avoid the problem that the float ball and the guide rod are fitted together, thereby affecting the liquid level sensing accuracy or even causing failure.

[0004] In order to solve the above technical problems, the present invention provides a float liquid level sensing mechanism, comprising:

[0005] A guide rod assembly, the guide rod assembly comprising a guide rod body and a first annular magnet, the first annular magnet being mounted on the guide rod body and coaxially arranged with the guide rod body; and

[0006] A float assembly, the float assembly comprising a float body and a second annular magnet, the float body being sleeved on the outer periphery of the guide rod body and being movable along the axial direction of the guide rod body, the second annular magnet being mounted on the float body and being coaxially arranged with the first annular magnet;

[0007] The magnetic poles of the adjacent annular surfaces of the first annular magnet and the second annular magnet are the same.

[0008] Further preferably, a first cavity extending along the axial direction of the guide rod body is provided in the guide rod body, and the first annular magnet is provided in the first cavity;

[0009] A second cavity is arranged in the float body, and the second annular magnet is arranged in the second cavity.

[0010] Further preferably, the outer peripheral wall of the guide rod body is provided with a first float stopper and a second float stopper which are axially opposite to each other, and the float body is arranged between the first float stopper and the second float stopper.

[0011] Further preferably, the first float limiting piece is provided with a first boss on the end surface facing the float body; and / or,

[0012] The end surface of the second float limiting piece facing the float body is provided with a second boss.

[0013] Further preferably, an axial extension length of the first annular magnet along the guide rod body is greater than a distance between the first float stopper and the second float stopper.

[0014] Further preferably, a support member protruding from an inner wall of the first cavity is provided in the first cavity, and the support member is connected to one end of the first annular magnet.

[0015] More preferably, it also includes:

[0016] at least one extension rod, the extension rod extending in a radial direction of the guide rod body and disposed on an outer wall of the guide rod body, the extension rod being provided with an extension cavity communicating with the first cavity; and

[0017] A reed switch is disposed in the extension cavity, and the reed switch is configured to be able to achieve conduction under the magnetic field of the second annular magnet.

[0018] Further preferably, the reed switch comprises:

[0019] A first contact and a second contact are arranged opposite to each other along the axial direction of the extension rod;

[0020] A first magnetic reed sheet, comprising a first connecting end and a first movable end, wherein the first connecting end is electrically connected to the first contact point; and

[0021] A second magnetic reed sheet, comprising a second connecting end and a second movable end, wherein the second connecting end is electrically connected to the second contact point;

[0022] The first movable end and the second movable end are arranged opposite to each other and spaced apart in the axial direction of the guide rod body, and the first movable end and the second movable end can contact each other under the action of the magnetic field of the second annular permanent magnet.

[0023] Further preferably, the float body is provided with a channel penetrating along its axial direction, the guide rod body is penetrated through the channel, and the outer diameter D1 of the guide rod body and the diameter D2 of the channel satisfy: D2-D1≥2mm.

[0024] A float liquid level sensing device, comprising the float liquid level sensing mechanism described above; and

[0025] A liquid container, at least a portion of the guide rod body and the float assembly are placed inside the liquid container.

[0026] Compared with the prior art, the float liquid level sensing mechanism and device provided by the present invention has the following beneficial effects:

[0027] The present invention coaxially arranges a first annular permanent magnet on a guide rod body and a second annular permanent magnet on a float body. When the float assembly is sleeved on the guide rod body, since the magnetic poles of the adjacent annular surfaces of the first annular magnet and the second annular magnet are the same, the principle of repulsion of like magnetic poles is utilized to make the float body and the guide rod body slide relative to each other in the axial direction, while the two always maintain a fixed distance separation state in the radial direction, thereby eliminating the problem of float adhesion caused by the fit of the float assembly and the guide rod assembly, and avoiding affecting the sensing accuracy of the liquid level sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of the float liquid level sensing device described in Example 2.

[0029] Figure 2 This is the front view of the float liquid level sensing device described in Example 2.

[0030] Figure 3 It is a top view of the float liquid level sensing device described in Example 2.

[0031] Figure 4 yes Figure 3 Cross-sectional view of section AA.

[0032] Figure 5 yes Figure 4 A magnified schematic diagram of point B in the middle.

[0033] Figure 6 It is a cross-sectional view of the guide rod assembly and the float assembly described in Example 1.

[0034] Figure 7 It is a schematic diagram of the assembly of the guide rod assembly and the float assembly described in Example 1.

[0035] Figure 8 yes Figure 7 Enlarged schematic diagram of point C in the middle.

[0036] Fig. 9 It is a schematic diagram of the first reed piece and the second reed piece of the reed switch described in Example 1 under normal conditions.

[0037] Fig.10 Schematic diagram of the reed switch described in Example 1 under the magnetic field state of the second annular permanent magnet.

[0038] Fig.11 Schematic diagram of the reed switch in Example 1 under the magnetic field state of the second annular permanent magnet. (The magnetic field direction of the second annular permanent magnet is Fig.10 on the contrary)

[0039] In the figure:

[0040] 10. Liquid container; 11. Shell; 12. Cover plate; 13. Screws; 14. Liquid inlet; 15. Liquid outlet; 16. Mounting hole;

[0041] 20. Guide rod assembly; 21. Guide rod body; 211. First cavity; 22. Locking nut; 23. First float stopper; 231. First boss; 24. Second float stopper; 241. Second boss; 25. First annular permanent magnet; 26. Support member; 27. Extension rod; 271. Extension cavity;

[0042] 30. Float assembly; 31. Float body; 311. Channel; 312. Second cavity; 32. Second annular permanent magnet; 321. Direction of magnetic flux lines;

[0043] 40. Reed switch; 41. First contact; 42. Second contact; 43. First reed piece; 431. First connection end; 432. First movable end; 44. Second reed piece; 441. Second connection end; 442. Second movable end. DETAILED DESCRIPTION

[0044] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0045] In the description of the present invention, it should be understood that 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" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that when 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 a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0050] Example 1

[0051] like Figure 5-Figure 8 As shown, this embodiment provides a float liquid level sensing mechanism, including a guide rod assembly 20 and a float assembly 30, wherein the float assembly 30 is sleeved on the guide rod assembly 20, and the float assembly 30 can slide along the axial direction of the guide rod assembly 20.

[0052] In some embodiments, the guide rod assembly 20 includes a guide rod body 21 and a first annular magnet 25, which is installed on the guide rod body 21 and coaxially arranged with the guide rod body 21; the float assembly 30 includes a float body 31 and a second annular magnet 32, the float body 31 is sleeved on the outer periphery of the guide rod body 21 and can move along the axial direction of the guide rod body 21, and the second annular magnet 32 ​​is installed on the float body 31 and coaxially arranged with the first annular magnet 25.

[0053] In some embodiments, the magnetic poles of the annular surfaces of the first annular magnet 25 and the second annular magnet 32 ​​are the same. By coaxially arranging the first annular permanent magnet 25 on the guide rod body 21 and the second annular permanent magnet 32 ​​on the float body 31, the first annular magnet 25 and the second annular magnet 32 ​​are coaxially arranged. Thus, when the float body 31 is sleeved on the guide rod body 21, the magnetic poles of the annular surfaces of the first annular magnet 25 and the second annular magnet 32 ​​are the same. By using the principle of repulsion of the same magnetic poles, when the float body 31 and the guide rod body 21 slide relative to each other in the axial direction, the two always maintain a fixed distance separation state in the radial direction, thereby eliminating the problem of the float sticking caused by the fit of the float assembly 30 and the guide rod assembly 20, and avoiding affecting the sensing accuracy of the liquid level sensor.

[0054] In some embodiments, the first annular magnet 25 can be disposed on the inner circumferential wall or the outer circumferential wall of the guide rod body 21. In a preferred embodiment, the guide rod body 21 is provided with a first cavity 211 extending along its axial direction, and the first annular magnet 25 is disposed in the first cavity 211. The first annular magnet 25 is disposed inside the guide rod body 21 to avoid direct contact between the first annular magnet 25 and the liquid.

[0055] In some embodiments, the float body 31 is provided with a channel 311 extending through the float body 311 along its axial direction, the guide rod body 21 is inserted into the channel 311, and the outer diameter D1 of the guide rod body 21 and the diameter D2 of the channel 311 satisfy: D2-D1≥2mm; therefore, since the magnetic poles of the annular surfaces close to the first annular magnet 25 and the second annular magnet 32 ​​are the same, utilizing the principle of repulsion of like magnetic poles, when D2-D1≥2mm, the float body 31 maintains a fixed gap with the guide rod body 21 during the movement process, thereby avoiding the phenomenon of fitting or bonding between the float body 31 and the guide rod body 21 under the action of liquid tension and viscosity, thereby improving the accuracy of liquid level detection.

[0056] In some embodiments, the second annular magnet 32 ​​can be set on the inner side of the channel 311, or can be set inside the float body 31; in a preferred embodiment, a second cavity 312 is provided in the float body 31, and the second annular magnet 32 ​​is provided in the second cavity 312. The second annular magnet 32 ​​is provided inside the float body 31 to avoid direct contact between the second annular magnet 32 ​​and the liquid.

[0057] In some embodiments, the first annular magnet 25 is disposed on the inner wall of the guide rod body 21, and the second annular magnet 32 ​​is disposed inside the float body 31, so as to ensure that the relative surfaces of the guide rod body 21 and the float body 31 are smooth. The smooth surface reduces the contact area between the liquid and the guide rod body 21 or the float body 31, thereby reducing the adhesion of the liquid to the surface of the guide rod body 21 and the float body 31, thereby avoiding the phenomenon of fitting or bonding between the float body 31 and the guide rod body 21 under the action of liquid tension and viscosity, thereby ensuring the accuracy of liquid level detection.

[0058] In some embodiments, the outer peripheral wall of the guide rod body 21 is provided with a first float limit plate 23 and a second float limit plate 24 which are axially opposite to each other, and the float body 31 is arranged between the first float limit plate 23 and the second float limit plate 24, wherein the first float limit plate 23 and the second float limit plate 24 are jointly used to limit the axial travel of the float body 31 in the guide rod body 21.

[0059] In some embodiments, the shape of the first float stopper 23 or the second float stopper 24 may be circular, rectangular or strip-shaped.

[0060] In some embodiments, when the shape of the first float stopper 23 or the second float stopper 24 is circular, the diameter of the first float stopper 23 or the second float stopper 24 is limited to be larger than the diameter D2 of the channel 311 and smaller than the outer diameter of the float body 31, thereby ensuring the axial limitation of the float body 31 while reducing the contact area between the first float stopper 23 or the second float stopper 24 and the float body 31, thereby reducing the risk of adhesion between the float body 31 and the first float stopper 23 or the second float stopper 24, and avoiding affecting the sensing accuracy of the liquid level sensor; similarly, when the first float stopper When the shape of the first float limit plate 23 or the second float limit plate 24 is a rectangle, the diagonal length of the first float limit plate 23 or the second float limit plate 24 is limited to be greater than the diameter D2 of the channel 311; when the shape of the first float limit plate 23 or the second float limit plate 24 is a strip structure, the number of the first float limit plate 23 or the second float limit plate 24 is multiple, and at this time, multiple strip-shaped first float limit plates 23 or second float limit plates 24 are spaced apart around the outer peripheral wall of the guide rod body 21, and the length of the first float limit plate 23 or the second float limit plate 24 is greater than the gap between the float body 31 and the guide rod body 21.

[0061] In some embodiments, in order to further reduce the contact area between the first float stop plate 23 or the second float stop plate 24 and the float body 31, a first boss 231 is provided on the end surface of the first float stop plate 23 facing the float body 31; similarly, a second boss 241 is provided on the end surface of the second float stop plate 24 facing the float body 31; by providing the first boss 231 and the second boss 241, the contact area between the first float stop plate 23 or the second float stop plate 24 and the float body 31 can be further reduced, thereby reducing the risk of adhesion between the float body 31 and the first float stop plate 23 or the second float stop plate 24, thereby improving the accuracy of liquid level detection.

[0062] In some embodiments, during the axial sliding of the float assembly 30 along the guide rod assembly 20, in order to avoid the axial misalignment of the first annular magnet 25 and the second annular magnet 32 ​​so as to prevent the float body 31 and the guide rod body 21 from always being kept in a fixed distance separation state in the radial direction, the axial extension length of the first annular magnet 25 along the guide rod body 21 is limited to be greater than the distance between the first float limit plate 23 and the second float limit plate 24, and the second annular magnet 32 ​​is arranged in the float body 31. Therefore, the inner annular surface of the second annular magnet 32 ​​always repels the outer annular surface of the first annular magnet 25 due to the same magnetic poles, thereby ensuring that the float body 31 and the guide rod body 21 are always in a fixed distance separation state in the radial direction.

[0063] In some embodiments, a support member 16 protruding from the inner wall of the first cavity 211 is provided in the first cavity 211, and the support member 16 is connected to one end of the first annular magnet 25. Specifically, the support member 16 is placed at the bottom of the first annular magnet 25 to support the first annular magnet 25 in the axial direction.

[0064] In some embodiments, Figure 5 As shown, the float liquid level sensing mechanism also includes at least one extension rod 27 and a reed switch 40. The extension rod 27 is extended along the radial direction of the guide rod body 21 and is arranged on the outer wall of the guide rod body 21. The extension rod 27 is provided with an extension cavity 271 connected to the first cavity 211. The reed switch 40 is arranged in the extension cavity 271. The reed switch 40 is configured to be closed and turned on under the magnetic field of the second annular magnet 32. The reed switch 40 is connected to an external circuit, which can be a low liquid level alarm circuit or a high liquid level alarm circuit or an automatic liquid adding circuit or an automatic liquid draining circuit. In this way, when the second annular magnet 32 ​​moves axially with the float body 31, the second annular magnet 32 ​​can act on the reed switch 40 to close the external circuit.

[0065] In other embodiments, there is one extension rod 27, and it is placed on the side of the second float limit plate 24 facing away from the first float limit plate 23. At this time, the external circuit connected to the reed switch 40 can be a low liquid level alarm circuit or an automatic liquid adding circuit, that is, under the action of the magnetic field of the second annular magnet 32, the reed switch 40 closes and turns on the low liquid level alarm circuit or the automatic liquid adding circuit to realize automatic low level alarm or automatic liquid adding.

[0066] In other embodiments, there are two extension rods 27, each of which is provided with a reed switch 40, and the two extension rods 27 are respectively arranged at opposite ends of the first float limit plate 23 and the second float limit plate 24, wherein the external circuit connected to the reed switch 40 near the first float limit plate 23 can be a high liquid level alarm circuit or an automatic drainage circuit to realize high-level automatic alarm or high-level automatic drainage, and the external circuit connected to the reed switch 40 near the second float limit plate 24 can be a low liquid level alarm circuit or an automatic liquid filling circuit to realize low-level automatic alarm or automatic liquid filling.

[0067] In some embodiments, the reed switch 40 includes a first contact 41 and a second contact 42 that are axially opposite to each other along the extension rod 27, and a first reed piece 43 and a second reed piece 44; wherein the first reed piece 43 includes a first connection end 431 and a first movable end 432, and the first connection end 431 is electrically connected to the first contact 41; the second reed piece 44 includes a second connection end 441 and a second movable end 442, and the second connection end 441 is electrically connected to the second contact 42; the first movable end 432 and the second movable end 442 are opposite to each other and spaced apart in the axial direction of the guide rod body 21, and the first movable end 432 and the second movable end 442 can contact each other under the action of the magnetic field of the second annular permanent magnet 32; thereby, when the second annular permanent magnet 32 ​​approaches the reed switch 40, the external circuit can be automatically turned on.

[0068] like Fig. 9 As shown, when the reed switch 40 is in a normal state, the first reed piece 43 and the second reed piece 44 are in a separated state, that is, the reed switch 40 is disconnected and the external circuit is not conducting.

[0069] When the second annular permanent magnet 32 ​​moves toward the reed switch 40, the direction of the magnetic flux lines 321 of the second annular permanent magnet 32 ​​acting on the reed switch 40 is from left to right (eg Fig.10 ), at this time, the first connecting end 431 of the first magnetic reed sheet 43 is magnetized to the S pole, and the first movable end 432 of the first magnetic reed sheet 43 is magnetized to the N pole. Similarly, the second connecting end 441 of the second magnetic reed sheet 44 is magnetized to the N pole, and the second movable end 442 of the second magnetic reed sheet 44 is magnetized to the S pole. At this time, the first movable end 432 and the second movable end 442 are attracted to each other due to the different poles, so that the reed switch 40 is closed and turned on.

[0070] Similarly, when the second annular permanent magnet 32 ​​moves toward the reed switch 40, the direction of the magnetic flux lines 321 of the second annular permanent magnet 32 ​​acting on the reed switch 40 is from right to left (eg Fig.11 ), at this time, the first connecting end 431 of the first magnetic reed sheet 43 is magnetized to the N pole, and the first movable end 432 of the first magnetic reed sheet 43 is magnetized to the S pole. Similarly, the second connecting end 441 of the second magnetic reed sheet 44 is magnetized to the S pole, and the second movable end 442 of the second magnetic reed sheet 44 is magnetized to the N pole. At this time, the first movable end 432 and the second movable end 442 are attracted to each other due to the different poles, so that the reed switch 40 is closed and turned on.

[0071] It can be seen that, in this embodiment, the second annular permanent magnet 32, on the one hand, utilizes the principle of like magnetic pole repulsion to keep a fixed gap between the float body 31 and the guide rod body 21 during movement, thereby avoiding the phenomenon of the float body 31 and the guide rod body 21 being fitted or bonded under the action of liquid tension and adhesion, thereby improving the accuracy of liquid level detection; on the other hand, it can control the opening and closing of the reed switch 40.

[0072] In this embodiment, a first annular permanent magnet 25 is coaxially arranged in the guide rod body 21, and a second annular permanent magnet 32 ​​is coaxially arranged in the float body 31. When the float assembly 30 is sleeved on the guide rod body 21, since the outer annular magnetic pole of the first annular permanent magnet 25 is the same as the inner annular magnetic pole of the second annular permanent magnet 32, and the float body 31 and the guide rod body 21 are separated by a certain space, the float assembly 30 and the guide rod assembly 20 are kept in a radially spaced separation state at all times during operation by utilizing the principle of repulsion of like magnetic poles, thereby eliminating the problem of the float sticking caused by the fit of the float assembly 30 and the guide rod assembly 20. In addition, the reed switch 40 can be arranged to be linked with the second annular permanent magnet 32. When the second annular permanent magnet 32 ​​moves toward the reed switch 40, the reed switch 40 can be triggered to close and conduct. When the second annular permanent magnet 32 ​​moves away from the reed switch 40, the first reed piece 43 and the second reed piece 44 are disconnected under the action of their own elasticity.

[0073] Example 2

[0074] like Figure 1-Figure 4 As shown, this embodiment provides a float liquid level sensing device, including the above-mentioned float liquid level sensing mechanism and a liquid container 10 , at least part of the guide rod body 21 and the float assembly 30 are placed inside the liquid container 10 .

[0075] In some embodiments, the liquid container 10 includes a shell 11 and a cover plate 12, wherein one side wall of the shell 11 is provided with an opening, and the cover plate 12 is used to close the opening so that the liquid container 10 forms a closed structure to avoid leakage and the like; and the liquid container 10 is designed to be in a split form of the shell 11 and the cover plate 12, which facilitates the installation of the guide rod assembly 20 and the float assembly 30.

[0076] In some embodiments, the housing 11 and the cover plate 12 are connected by screws 13, and a sealing ring is provided between the housing 11 and the cover plate 12 to improve the sealing effect.

[0077] In some embodiments, a liquid inlet 14 is provided on the cover plate 12, and a liquid outlet 15 is provided on the shell 11. Both the liquid inlet 14 and the liquid outlet 15 are connected to the interior of the liquid container 10 to facilitate liquid addition or discharge.

[0078] In some embodiments, a mounting hole 16 is formed on the cover plate 12 , and one end of the guide rod body 21 passes through the mounting hole 16 and extends into the interior of the liquid container 10 .

[0079] In order to facilitate the fixed installation of the guide rod body 21 and the liquid container 10, a locking nut 22 is also provided on the guide rod body 21. There are two locking nuts 22 and they are respectively placed on both sides of the cover plate 12. The guide rod body 21 and the cover plate 12 can be locked by the two locking nuts 22.

[0080] In a preferred embodiment, in order to avoid leakage at the mounting hole 16 , a sealing gasket is provided at the contact point between the locking nut 22 and the cover plate 12 .

[0081] In summary, the embodiments of the present invention provide a float liquid level sensing mechanism and device, which utilizes the principle of repulsion of like magnetic poles to ensure that the float assembly 30 and the guide rod assembly 20 always maintain a fixed distance separation state in the radial direction during operation, thereby eliminating the problem of float adhesion caused by the fit between the float assembly 30 and the guide rod assembly 20, avoiding affecting the sensing accuracy of the liquid level sensor, and at the same time reducing manual cleaning and maintenance time and improving device utilization; and the second annular permanent magnet 32 ​​can act on the reed switch 40 to realize the conduction and disconnection of the external circuit.

[0082] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be regarded as the protection scope of the present invention. The basic principles, main features and advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above preferred embodiments. The embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

[0083] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A float liquid level sensing mechanism, characterized in that: include: A guide rod assembly (20), the guide rod assembly (20) comprising a guide rod body (21) and a first annular magnet (25), the first annular magnet (25) being mounted on the guide rod body (21) and being coaxially arranged with the guide rod body (21); and A float assembly (30), the float assembly (30) comprising a float body (31) and a second annular magnet (32), the float body (31) being sleeved on the outer periphery of the guide rod body (21) and being movable along the axial direction of the guide rod body (21), the second annular magnet (32) being mounted on the float body (31) and being coaxially arranged with the first annular magnet (25); The magnetic poles of the adjacent annular surfaces of the first annular magnet (25) and the second annular magnet (32) are the same.

2. The float liquid level sensing mechanism according to claim 1, characterized in that: The guide rod body (21) is provided with a first cavity (211) extending along its axial direction, and the first annular magnet (25) is arranged in the first cavity (211); A second cavity (312) is provided in the float body (31), and the second annular magnet (32) is arranged in the second cavity (312).

3. The float liquid level sensing mechanism according to claim 1, characterized in that: The outer peripheral wall of the guide rod body (21) is provided with a first float stopper (23) and a second float stopper (24) which are arranged opposite to each other in the axial direction, and the float body (31) is arranged between the first float stopper (23) and the second float stopper (24).

4. The float liquid level sensing mechanism according to claim 3, characterized in that: The end surface of the first float limiting piece (23) facing the float body (31) is provided with a first boss (231); and / or, The end surface of the second float limiting piece (24) facing the float body (31) is provided with a second boss (241).

5. The float liquid level sensing mechanism according to claim 3, characterized in that: The axial extension length of the first annular magnet (25) along the guide rod body (21) is greater than the distance between the first float stopper (23) and the second float stopper (24).

6. The float liquid level sensing mechanism according to claim 2, characterized in that: A support member (16) protruding from an inner wall of the first cavity (211) is provided in the first cavity (211), and the support member (16) is connected to one end of the first annular magnet (25).

7. The float liquid level sensing mechanism according to claim 2, characterized in that: Also includes: at least one extension rod (27), the extension rod (27) extending in the radial direction of the guide rod body (21) and arranged on the outer wall of the guide rod body (21), the extension rod (27) having an extension cavity (271) in communication with the first cavity (211); and A reed switch (40), the reed switch (40) being disposed in the extension cavity (271), the reed switch (40) being configured to be able to achieve conduction under the action of the magnetic field of the second annular magnet (32).

8. The float liquid level sensing mechanism according to claim 7, characterized in that: The reed switch (40) comprises: A first contact point (41) and a second contact point (42) arranged axially opposite to each other along the extension rod (27); A first magnetic reed piece (43), comprising a first connecting end (431) and a first movable end (432), wherein the first connecting end (431) is electrically connected to the first contact point (41); and A second magnetic reed sheet (44), comprising a second connecting end (441) and a second movable end (442), wherein the second connecting end (441) is electrically connected to the second contact point (42); The first movable end (432) and the second movable end (442) are arranged opposite to each other and spaced apart in the axial direction of the guide rod body (21), and the first movable end (432) and the second movable end (442) can contact each other under the action of the magnetic field of the second annular permanent magnet (32).

9. The float liquid level sensing mechanism according to claim 1, characterized in that: The float body (31) is provided with a channel (311) penetrating along its axial direction, the guide rod body (21) is arranged in the channel (311), and the outer diameter D1 of the guide rod body (21) and the diameter D2 of the channel (311) satisfy: D2-D1≥2mm.

10. A float liquid level sensing device, characterized in that: comprising a float liquid level sensing mechanism as described in any one of claims 1 to 9; and The liquid container (10), at least a portion of the guide rod body (21) and the float assembly (30) are all placed inside the liquid container (10).

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