Underwater liquid level switch

Abstract

The invention discloses an underwater liquid level switch which comprises a shell, a cable, a trigger assembly and a circuit module. A sealing cavity for accommodating the circuit module is arranged in the shell, and a guide bin communicated with the outside is arranged at the lower part of the shell; the cable and the circuit module are both installed in the sealing cavity. The trigger assembly is suspended in the guide bin and comprises a suspension body, a first magnet, a second magnet and a trigger switch, the first magnet is mounted on the suspension body, and the suspension body is suspended in the guide bin; and the trigger switch is mounted in the sealing cavity. The adsorption of the magnetic force can ensure that the first magnet and the second magnet are kept in an adsorption state within a certain liquid level fluctuation range, so that the jitter of a signal of the liquid level switch is prevented, and the measured value is more visual and accurate. The whole suspension body drives the first magnet to move up and down back and forth in the guide bin, so that the winding risk of a cable is prevented, the whole measurement process is smoother, the service life is prolonged, and the maintenance cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level control switches, and particularly to an underwater liquid level switch. Background Art

[0002] A liquid level switch is a measuring instrument that senses the height of a liquid and outputs a switching quantity according to requirements: A liquid level switch belongs to a kind of liquid level gauge and is a switching quantity instrument. Its main function is to generate a switching signal, and generally, the switching state can be represented by high and low levels. For the measured physical quantity, a switching quantity instrument can measure parameters such as liquid level, temperature, pressure, flow rate, humidity, etc., and generate a switching quantity signal. According to the characteristics of the measured physical quantity, the switching quantity instruments mainly include liquid level switches, flow switches, temperature switches, pressure switches, humidity switches, etc.

[0003] However, for some existing float-rotating liquid level switches in the prior art, in order to ensure reliable closing or shutting off of the liquid level switch, it is necessary to ensure effective rotation of the float. Therefore, the float requires a large activity space for rotation, which will result in a large control dead band of the liquid level switch. For scenarios with relatively small changes in the liquid level surface, the large dead band will not be able to ensure the control accuracy. At the same time, in some narrow spaces, the liquid level switch will not be able to work properly.

[0004] Since the cable part between the gravity hammer and the float needs to be bent, and this part of the cable is in a high-temperature liquid environment for a long time, it is easy to cause aging of this part of the cable. The aging of the cable causes the liquid level switch to not be able to effectively rotate smoothly. During the rotation process of the liquid level switch, the cables are also easily entangled with each other, resulting in the switch being unable to be triggered or restored. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an underwater liquid level switch.

[0006] The technical solution adopted by the present invention to solve its technical problems is: to construct an underwater liquid level switch, including: a housing, a cable, a trigger assembly, and a circuit module; a sealed cavity for accommodating the circuit module is provided inside the housing, and a guiding chamber communicating with the outside is provided at the lower part of the housing; both the cable and the circuit module are installed in the sealed cavity; the trigger assembly is suspended in the guiding chamber, and the trigger assembly includes: a floating body, a first magnet, a second magnet, and a trigger switch. The first magnet is installed on the floating body, and the floating body is suspended in the guiding chamber; the trigger switch is installed in the sealed cavity; the second magnet is installed on the trigger switch and cooperates with the first magnet to control the energization or de-energization of the circuit module and the cable through the trigger switch.

[0007] Further, the housing includes: a base, an upper housing, and a lower housing. A groove for accommodating the circuit module is provided in the upper part of the base; the upper housing is mounted on the upper part of the base, and a sealed cavity is formed between the upper housing and the base; the lower housing is mounted on the lower part of the base, and a guiding bin is surrounded by the lower housing and the base.

[0008] Further, a stable channel for accommodating the first magnet is provided on the base, and the stable channel is communicated with or isolated from the guiding bin.

[0009] Further, a sewage outlet communicating the guiding bin with the outside is provided on the lower housing; and / or a plurality of through holes communicating with the guiding bin are provided on the side wall of the lower housing.

[0010] Further, the suspension body includes: a suspension block, a first counterweight block, and a bracket. The suspension block and the first counterweight block are both detachably mounted on the bracket, and the first magnet is detachably mounted on one end of the bracket close to the second magnet.

[0011] Further, the suspension block is a hollow sphere, ellipsoid or polygon.

[0012] Further, the suspension body further includes a second counterweight block detachably mounted on the bracket.

[0013] Further, a first contact is provided on the circuit module. The trigger switch includes: a trigger bracket, a second contact, and an elastic member. The trigger bracket is mounted on the base, and the second magnet is slidably connected to the trigger bracket; the second contact is mounted on the second magnet; the elastic member is mounted between the second magnet and the base to control the separation or contact of the first contact and the second contact.

[0014] Further, the base, the upper housing, and the lower housing are all cylindrical, and sealing rings are mounted between the upper housing and the lower housing and the base; and / or a sealing member is extrusion-sealed between the upper housing and the cable.

[0015] Further, the upper housing includes: a plurality of sleeve shells, and the plurality of sleeve shells are sequentially sleeved on the base from small to large, and a wire passing channel allowing the cable to pass through is formed between adjacent sleeve shells.

[0016] Implementing the present invention has the following beneficial effects:

[0017] This application has a first magnet installed on a floating body, which is suspended in a guiding chamber. A trigger switch is installed in a sealed cavity, and a second magnet is installed on the trigger switch. The second magnet cooperates with the first magnet to control the energization or de-energization of the circuit module and the cable through the trigger switch. The magnetic adsorption can ensure that the first magnet and the second magnet remain in an adsorbed state within a certain liquid level fluctuation range, thereby preventing the jitter of the liquid level switch signal and making the measured value more intuitive and accurate. The entire floating body drives the first magnet to move up and down back and forth in the guiding chamber, preventing the risk of cable entanglement, making the entire measurement process smoother, extending the service life, and saving maintenance costs. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the present invention, the present invention will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] In the drawings:

[0020] Figure 1 is a schematic structural view of an underwater liquid level switch provided by an embodiment of the present invention;

[0021] Figure 2 is a sectional view of an underwater liquid level switch provided by an embodiment of the present invention;

[0022] Figure 3 is an exploded schematic structural view of an underwater liquid level switch provided by an embodiment of the present invention;

[0023] Figure 4 is a sectional view of a base provided by an embodiment of the present invention;

[0024] Figure 5 is a schematic structural view of a trigger switch provided by an embodiment of the present invention;

[0025] Figure 6 is a sectional view of a lower housing provided by an embodiment of the present invention;

[0026] Figure 7 is a sectional view of an upper housing provided by an embodiment of the present invention.

[0027] Description of the Marks in the Figures

[0028] Housing 1, sealing cavity 11, guiding bin 12, base 13, stable channel 131, upper housing 14, sleeve housing 141, wire threading channel 142, lower housing 15, sewage outlet 151, through hole 152, cable 2, triggering assembly 3, suspension body 31, suspension block 311, first counterweight 312, bracket 313, second counterweight 314, first magnet 32, second magnet 33, trigger switch 34, trigger bracket 341, second contact 342, elastic member 343, circuit module 4, first contact 41, seal 5. Detailed implementation manners

[0029] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation, only for the convenience of describing the present technical solution, rather than indicating that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0030] It should also be noted that unless otherwise clearly specified and limited, terms such as "installation", "connection", "attachment", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements. Terms such as "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, in order to thoroughly understand the embodiments of the present invention. However, those skilled in the art should be clear that the present invention can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from hindering the description of the present invention.

[0032] Please refer to Figures 1 - 4 In the first embodiment of the present invention, the underwater liquid level switch includes: a housing 1, a cable 2, a trigger assembly 3, and a circuit module 4. A sealed cavity 11 for accommodating the circuit module 4 is provided inside the housing 1. A guiding chamber 12 communicating with the outside is provided at the lower part of the housing 1. The cable 2 and the circuit module 4 are both installed in the sealed cavity 11. The trigger assembly 3 is suspended in the guiding chamber 12. The trigger assembly 3 includes: a floating body 31, a first magnet 32, a second magnet 33, and a trigger switch 34. The first magnet 32 is installed on the floating body 31. The floating body 31 is suspended in the guiding chamber 12. The trigger switch 34 is installed in the sealed cavity 11. The second magnet 33 is installed on the trigger switch 34 and cooperates with the first magnet 32 to control the power on or off of the circuit module 4 and the cable 2 through the trigger switch 34.

[0033] In this application, the first magnet 32 is installed on the floating body 31. The floating body 31 is suspended in the guiding chamber 12. The trigger switch 34 is installed in the sealed cavity 11. The second magnet 33 is installed on the trigger switch 34 and cooperates with the first magnet 32 to control the power on or off of the circuit module 4 and the cable 2 through the trigger switch 34. The entire circuit module 4 and the connection position of the cable 2 to the circuit module 4 are both in the sealed cavity 11, having good sealing performance, enabling the entire liquid level switch to be completely immersed below the liquid surface, and being applicable to more usage environments. The cable 2 for transmitting electricity can be used to hang the entire liquid level switch, facilitating installation at a suitable position. With the cable 2 hung for installation, the entire liquid level switch can be kept vertical below the liquid surface, being more sensitive and accurate in measurement. The cable 2 serves both as the signal cable of the liquid level switch and as the fixing cable of the liquid level switch. By adjusting the length of the cable 2 that drops, the trigger liquid level height of the measured liquid level can be adjusted, thus facilitating measurement at different positions and improving the measurement efficiency.

[0034] Among them, the guiding chamber 12 provides a suspension space for the trigger assembly 3 and also confines the trigger assembly 3 within the guiding chamber 12, facilitating layout and installation. The guiding chamber 12 communicating with the outside enables the liquid level to quickly reach the trigger assembly 3, enabling the trigger assembly 3 to respond sensitively. The housing 1 can play a certain protective role for the trigger assembly 3, preventing other substances in the liquid level from interfering with the floating of the trigger assembly 3, thereby improving the measurement accuracy and extending the service life.

[0035] The liquid level switch suspended below the liquid surface will not move under the action of its own gravity, while the suspension body 31 located in the guiding bin 12 will be buoyed by the liquid surface, causing it to float or sink. When the liquid level rises, the buoyancy of the entire liquid surface will increase, and the increased buoyancy will act on the suspension body 31, causing it to float. The floating suspension body 31 drives the first magnet 32 to approach the second magnet 33 of the trigger switch 34. When the first magnet 32 moves into the magnetic range of the second magnet 33, the first magnet 32 and the second magnet 33 approach each other, the second magnet 33 moves downward, and the first magnet 32 moves upward. The downward-moving second magnet 33 drives the trigger switch 34 to control the energization or power-off of the circuit module 4 and the cable 2. When the liquid level drops, the buoyancy of the entire liquid surface will decrease, and the decreased buoyancy is less than the gravity of the suspension body 31 itself, causing it to sink. Due to the magnetic force between the first magnet 32 and the second magnet 33, when the liquid level drops, the first magnet 32 and the second magnet 33 will not be separated instantly. When the gravity of the suspension body 31 is greater than the magnetic force between the first magnet 32 and the second magnet 33 and the buoyancy it receives, the suspension body 31 drives the first magnet 32 to separate from the second magnet 33. Without the restriction of the second magnet 33, the trigger switch 34 resets to control the power-off or energization of the circuit module 4 and the cable 2. The magnetic adsorption can ensure that the first magnet 32 and the second magnet 33 remain adsorbed within a certain liquid level fluctuation range, thereby preventing the jitter of the liquid level switch signal and making the measured value more intuitive and accurate. The entire suspension body 31 drives the first magnet 32 to move up and down back and forth in the guiding bin 12, preventing the risk of cable entanglement, making the entire measurement process smoother, extending the service life, and saving the maintenance cost. Among them, since the trigger assembly 3, the circuit module 4, and the housing 1 are on the same axis, and the suspension body 31 is also on the same axis when floating with the liquid surface, the occupied space during the operation of the entire liquid level switch is saved, the volume of the entire liquid level switch can be reduced, and it is applicable to more usage environments.

[0036] Among them, by changing the gravity of the suspension body 31 and the area receiving the buoyancy, the buoyancy received by the suspension body 31 can be changed. Furthermore, when there is a slight change in the liquid level, the suspension body 31 can also drive the first magnet 32 and the second magnet 33 to cooperate to control the energization or power-off of the circuit module 4 and the cable 2 through the trigger switch 34, and accurate control accuracy and measured values can be maintained in an environment with a small hysteresis.

[0037] Please refer to Figures 1 - 7 , in some embodiments, the housing 1 includes: a base 13, an upper housing 14, and a lower housing 15. A groove for accommodating the circuit module 4 is provided in the upper part of the base 13. The upper housing 14 is installed on the upper part of the base 13, forming a sealed cavity 11 between the upper housing 14 and the base 13. The lower housing 15 is installed on the lower part of the base 13, surrounding the guiding bin 12 with the base 13.

[0038] The present application is provided with a groove for accommodating the circuit module 4 on the upper part of the base 13, and the upper shell 14 is installed on the upper part of the base 13 to form a sealed cavity 11 with the base 13. The groove can improve the stability of the circuit module 4 in the sealed cavity 11, reduce the collision of the circuit module 4 due to the shaking of the base 13, and improve the safety and service life. Through the separate design of the base 13 and the upper shell 14, the circuit module 4 can be installed in the sealed cavity 11 more conveniently, and can be fixed by bolts or threaded pairs, which improves the efficiency of installation. The lower shell 15 is installed at the lower part of the base 13 and forms a guide chamber 12 with the base 13. The lower shell 15 can play a certain protective role on the suspension 31, prevent impurities in the liquid surface from interfering with the floating of the suspension 31, and can also prevent the impact of liquid level fluctuations on the operation of the suspension 31, improve the stability during measurement, and through the separate installation method of the lower shell 15 and the base 13, it is convenient to install the suspension 31 in the guide chamber 12, and can also be fixed by bolts or threaded pairs, which is further convenient for installation and improves the efficiency of installation.

[0039] See also Figure 1 , Figure 2 and Figure 7 In some embodiments, a stabilizing channel 131 for accommodating the first magnet 32 is provided on the base 13 , and the stabilizing channel 131 is connected to or isolated from the guide bin 12 .

[0040] The present application is provided with a stabilizing channel 131 for accommodating the first magnet 32 on the base 13, and the stabilizing channel 131 is connected or isolated from the guide bin 12. Among them, the stabilizing channel 131 can play a certain guiding role when the first magnet 32 floats up and down with the suspension 31, reduce the shaking of the suspension 31, and improve the stability and accuracy of the measurement. The stabilizing channel 131 is arranged on the base 13, which reduces the distance between the first magnet 32 and the second magnet 33, and can react more sensitively. Among them, when the stabilizing channel 131 is connected with the guide bin 12, the first magnet 32 and the suspension 31 can float more sensitively with the change of the liquid level, improve the stability and accuracy of the measurement, and facilitate installation. When the stabilizing channel 131 is isolated from the guide chamber 12, a sealing ring is used to form an independent sealed chamber in the stabilizing channel 131. The first magnet 32 is located in the sealed chamber, which effectively prevents the liquid from entering the sealed chamber and causing corrosion to the first magnet 32, thereby extending the service life of the first magnet 32 and reducing the interference of the liquid surface buoyancy on the first magnet 32, further improving the proportional relationship between the suspension 31 and the liquid surface buoyancy, facilitating the operator's later adjustments, and further improving the accuracy of the measured values.

[0041] See also Figure 2 and Figure 6 In some embodiments, a sewage outlet 151 connecting the guide bin 12 with the outside is provided on the lower shell 15 .

[0042] In this application, a sewage outlet 151 communicating the guiding chamber 12 with the outside is provided on the lower housing 15. The sewage outlet 151 is located at the bottom of the guiding chamber 12. When impurities enter the guiding chamber 12, the impurities will also descend as the liquid level drops. The impurities can be removed from the guiding chamber 12 through the sewage outlet 151, preventing internal accumulation, reducing interference to the suspension 31, and further improving the stability and accuracy of measurement. The sewage outlet 151 can also be used as an outlet for the guiding chamber 12 to communicate with the outside, allowing the liquid level to enter the guiding chamber 12 through the sewage outlet 151, driving the suspension 31 to float up and down. When the liquid level switch is pulled out of the liquid level from the guiding chamber 12 below the sewage outlet 151, the impurities in the guiding chamber 12 will flow out through the sewage outlet 151 with the liquid, facilitating cleaning and improving the maintenance efficiency. The diameter of the sewage outlet 151 should be smaller than the diameter of the suspension 31 to prevent the suspension 31 from getting stuck or being removed from the sewage outlet 151, thereby improving the fluency of the entire liquid level switch and the convenience during installation.

[0043] Please refer to Figure 6 , in some embodiments, a plurality of through holes 152 communicating with the guiding chamber 12 are provided on the side wall of the lower housing 15.

[0044] In this application, a plurality of through holes 152 communicating with the guiding chamber 12 are provided on the side wall of the lower housing 15. Most of the through holes 152 are opened on the upper side wall of the guiding chamber 12, which can accelerate the liquid entering the guiding chamber 12 to act on the suspension 31, improving the measurement efficiency. The through holes 152 can prevent larger impurities from entering the guiding chamber 12, further protecting the suspension 31, preventing the suspension 31 from being stuck, and improving the fluency and stability of the entire liquid level switch during operation.

[0045] Please refer to Figures 1 - 7 , in some embodiments, the suspension 31 includes: a suspension block 311, a first counterweight 312, and a bracket 313. The suspension block 311 and the first counterweight 312 are both detachably mounted on the bracket 313, and the first magnet 32 is detachably mounted at one end of the bracket 313 close to the second magnet 33.

[0046] In this application, the floating block 311 and the first counterweight 312 are both detachably mounted on the bracket 313. The first magnet 32 is detachably mounted at one end of the bracket 313 close to the second magnet 33. The overall weight of the floating body 31 can be adjusted by the first counterweight 312 according to the buoyancy of the liquid level in the use environment, so as to be applicable to more environments. The bracket 313 therein can play a certain guiding role, enabling the floating body 31 to float up and down more stably in the guiding chamber 12. More first counterweights 312 can also be installed on the bracket 313 to further make the floating body 31 applicable to more use environments. The first magnet 32 mounted at one end of the bracket 313 close to the second magnet 33 can reduce the distance between the first magnet 32 and the second magnet 33, and thus the response is more sensitive. The position of the first magnet 32 on one end of the bracket 313 can also be adjusted, so as to change the distance between the first magnet 32 and the second magnet 33, and the depth of the floating body 31 applicable to the liquid level can be expanded, further expanding the applicable range of the entire liquid level switch.

[0047] Among them, the floating block 311, the first counterweight 312 and the first magnet 32 can all be mounted on the bracket 313 by a thread pair or a bolt, and can be replaced in time after wear, saving the maintenance cost and being convenient for debugging and installation.

[0048] Please refer to Figure 2 、 Figure 4 and Figure 6 , in some embodiments, the floating block 311 is a hollow sphere, ellipse or polygon.

[0049] In this application, since the floating block 311 is a hollow structure, it has better buoyancy and can improve the sensitivity of the entire liquid level switch. The spherical floating block 311 can reduce the contaminated impurities and can also reduce the impact of liquid level fluctuations on the floating body 31, further improving the stability and accuracy of measurement.

[0050] Among them, the elliptical floating block 311 is convenient for manufacturing and installation, and can also play a certain guiding role, enabling the floating body 31 to float up and down more smoothly and improving the smoothness.

[0051] Among them, the polygonal floating block 311 is convenient for manufacturing and installation, can be applicable to more use environments, and different-shaped floating blocks 311 can be selected according to different use environments. The side surface of the polygon can better cooperate with the guiding chamber 12, which can further improve the stability of the floating block 311 when floating up and down, and thus make the measured value more stable.

[0052] Please refer to Figure 4 and Figure 6, in some embodiments, the suspension body 31 further includes a second counterweight 314 detachably mounted on the bracket 313.

[0053] In the present application, through the second counterweight 314 detachably mounted on the bracket 313, and the second counterweight 314 being located at the bottom end of the bracket 313, the suspension block 311 can be restricted on the bracket 313, and the second counterweight 314 can be disassembled and assembled through the sewage outlet 151. Furthermore, it is not necessary to open the lower housing 15, the replacement is more convenient and labor-saving, and the adjustment efficiency is improved.

[0054] Please refer to Figure 2 , Figure 4 , Figure 5 and Figure 7 , in some embodiments, a first contact 41 is provided on the circuit module 4. The trigger switch 34 includes: a trigger bracket 341, a second contact 342, and an elastic member 343. The trigger bracket 341 is mounted on the base 13, the second magnet 33 is slidably connected to the trigger bracket 341, the second contact 342 is mounted on the second magnet 33, and the elastic member 343 is mounted between the second magnet 33 and the base 13 to control the separation or contact of the first contact 41 and the second contact 342.

[0055] In the present application, through the trigger bracket 341 being mounted on the base 13, the second magnet 33 being slidably connected to the trigger bracket 341, the second contact 342 being mounted on the second magnet 33, and the elastic member 343 being mounted between the second magnet 33 and the base 13 to control the separation or contact of the first contact 41 and the second contact 342. When the first magnet 32 follows the suspension body 31 to float upward, after the first magnet 32 moves into the magnetic force range of the second magnet 33, the second magnet 33 will slide downward against the elastic force of the elastic member 343. The second magnet 33 that slides downward will drive the second contact 342 to approach the first contact 41. When the second contact 342 contacts the first contact 41, the cable 2 and the circuit module 4 are powered on or off, and its signal is transmitted to the ground through the cable 2 for recording. When the liquid level drops, when the magnetic force between the first magnet 32 and the second magnet 33 plus the buoyancy provided by the liquid level is less than the self-gravity of the suspension body 31, the suspension body 31 drives the first magnet 32 to move downward. After the first magnet 32 moves out of the magnetic force range of the second magnet 33, the elastic member 343 will drive the second magnet 33 to reset. The reset second magnet 33 drives the second contact 342 to separate from the first contact 41, and the cable 2 and the circuit module 4 are powered off or on. The magnetic adsorption therein can ensure that the first magnet 32 and the second magnet 33 maintain an adsorbed state within a certain liquid level fluctuation range, thereby preventing the jitter of the liquid level switch signal and making the measured value more intuitive and accurate. The entire trigger switch 34 has a simple structure and low manufacturing cost. By adopting a mechanical mechanism as a whole, the interference of radiation can be reduced and the service life can be extended.

[0056] Among them, the first magnet 32 can slide and be limited on the floating body 31. When the floating body 31 sinks, the first magnet 32 remains in a magnetically attracted state with the second magnet 33. Only when the first magnet 32 slides to the limiting end of the floating body 31 will it drive the first magnet 32 to move downward and separate from the second magnet 33, thereby expanding the adaptation range of the first magnet 32 and the second magnet 33 within a certain liquid level fluctuation. By changing the sliding distance of the first magnet 32 on the floating body 31, the applicable liquid level fluctuation range can be changed, which is convenient for debugging and applicable to more usage environments.

[0057] Please refer to Figures 1 - 7 , in some embodiments, the base 13, the upper shell 14, and the lower shell 15 are all cylindrical, and sealing rings are installed between the upper shell 14 and the lower shell 15 and the base 13.

[0058] In this application, since the base 13, the upper shell 14, and the lower shell 15 are all cylindrical, and sealing rings are installed between the upper shell 14 and the lower shell 15 and the base 13. The cylindrical base 13, upper shell 14, and lower shell 15 can effectively reduce the impact of the liquid level, improve the stability of the liquid level switch below the liquid surface, and thus improve the accuracy and smoothness of measurement. It can also reduce the adhesion of impurities on the outer surface, affect its own balance, and thus improve the stability below the liquid surface, relieve the pressure on the cable 2, extend the service life, and facilitate cleaning. Among them, the sealing rings installed between the upper shell 14 and the lower shell 15 and the base 13 can enhance the sealing performance between them, prevent the intrusion of moisture, extend the service life, and are applicable to more usage environments.

[0059] Please refer to Figure 2 and Figure 7 , in some embodiments, a seal 5 is extruded and sealed between the upper shell 14 and the cable 2.

[0060] In this application, since a seal 5 is extruded and sealed between the upper shell 14 and the cable 2, the gap between the upper shell 14 and the cable 2 is blocked by the extruded seal 5, improving the sealing performance of the sealing cavity 11, and thus enhancing the protection of the internal circuit module 4. The extruded seal 5 can also cause extrusion on the passing cable 2 during the extrusion process, increasing the connection strength between the cable 2 and the shell 1, improving the stability and firmness of the cable 2 when suspending the liquid level switch, further extending the service life, being applicable to more complex environments, and being able to be lowered to a deeper liquid surface, expanding the applicable range.

[0061] Among them, the seal 5 can adopt a flexible structure with a certain self-elasticity, such as rubber or polyurethane material, and use its own elasticity to tighten and squeeze between the upper shell 14 and the cable 2, thereby saving the manufacturing cost. The seal 5 can also be squeezed and sealed between the upper shell 14 and the cable 2 by a limiting member. The limiting member can be installed on the upper shell 14 by bolts, screw pairs or buckles. During the installation process, the seal 5 is tightly squeezed between the upper shell 14 and the cable 2, thereby making it more tightly squeezed and sealed, improving the sealing performance of the internal sealed cavity 11 and the connection strength between the upper shell 14 and the cable 2. By connecting with bolts, screw pairs or buckles, it is possible to more labor-savingly use the limiting member to squeeze and seal the seal 5 between the upper shell 14 and the cable 2, improving the installation efficiency and making the operation more labor-saving and convenient.

[0062] Please refer to Figure 1 、 Figure 2 and Figure 7 , in some embodiments, the upper shell 14 includes: a plurality of sleeve shells 141, the plurality of sleeve shells 141 are sequentially sleeved on the base 13 from small to large, and a threading channel 142 allowing the cable 2 to pass through is formed between adjacent sleeve shells 141.

[0063] In this application, a plurality of sleeve shells 141 are sequentially sleeved on the base 13 from small to large, and a threading channel 142 allowing the cable 2 to pass through is formed between adjacent sleeve shells 141. During installation, first pass the cable 2 through the respective sleeve shells 141, and then install the sleeve shells 141 on the base 13 in the order from small to large, so that the large sleeve shell 141 is sleeved outside the small sleeve shell 141, thereby facilitating the threading layout of the cable 2, improving the installation efficiency of the cable 2, and facilitating the operation. Among them, by the installation method of threading first and then installing the sleeve shells 141, during the installation process, the gap between adjacent sleeve shells 141 can be made smaller than the diameter of the cable 2, and the installed adjacent sleeve shells 141 are used to squeeze the cable 2 in the threading channel 142, further improving the connection strength and sealing performance between the cable 2 and the shell 1, and facilitating the operation.

[0064] The threading channel 142 is wavy. In this way, when moisture penetrates into the interior of the outermost sleeve shell 141, the wavy threading channel 142 will use the inner second-layer sleeve shell 141 to block the entering moisture, preventing the penetrated moisture from directly contacting the internal circuit module 4. Through layer-by-layer blocking, the sealing performance is further improved, the service life is extended, it is suitable for environments with deeper and more complex liquid levels, and the scope of use is expanded.

[0065] Among them, the wire threading channel 142 between adjacent sheaths 141 is in an inverted V shape or an n shape. The entire underwater liquid level switch is not flipped. Since multiple sheaths 141 are all installed in an inverted state, under the action of air pressure, even if all the external seals fail, the leaked moisture will form a liquid level layer at the bottom of the inverted V shape or n shape between adjacent sheaths 141. When the liquid level further rises, even if the liquid level layer exceeds the first inverted V shape or n shape, the leaked moisture will be blocked by the second inverted V shape or n shape. After the leaked moisture passes through the inverted V shape or n shape, a water seal will be formed between the inverted V shapes or n shapes to prevent the air inside the original housing 1 from leaking out. The internal air pressure will prevent the leaked moisture medium from further seeping in. Thus, it is ensured that the immersed moisture is blocked outside the innermost sheath 141, providing multiple sealing protections and safeguards for the cable 2, further improving the sealing performance and applicable range, and ensuring the accuracy of the measured values and the sensitivity of the response of the underwater liquid level switch.

[0066] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. An underwater liquid level switch, characterized in that, Comprising: A housing (1), a cable (2), a trigger assembly (3), and a circuit module (4); A sealed cavity (11) for accommodating the circuit module (4) is provided inside the housing (1), and a guide chamber (12) communicating with the outside is provided at the lower part of the housing (1); Both the cable (2) and the circuit module (4) are installed in the sealed cavity (11); The trigger assembly (3) is suspended in the guide chamber (12). The trigger assembly (3) includes: a floating body (31), a first magnet (32), a second magnet (33), and a trigger switch (34). The first magnet (32) is installed on the floating body (31), and the floating body (31) is suspended in the guide chamber (12); The trigger switch (34) is installed in the sealed cavity (11); The second magnet (33) is installed on the trigger switch (34), and cooperates with the first magnet (32) to control the energization or de-energization of the circuit module (4) and the cable (2) through the trigger switch (34).

2. The underwater liquid level switch according to claim 1, characterized in that, The housing (1) includes: a base (13), an upper housing (14), and a lower housing (15). A groove for accommodating the circuit module (4) is provided at the upper part of the base (13); the upper housing (14) is installed at the upper part of the base (13), and the sealed cavity (11) is formed between the upper housing (14) and the base (13); the lower housing (15) is installed at the lower part of the base (13), and the guide chamber (12) is surrounded by the lower housing (15) and the base (13).

3. The underwater level switch according to claim 2, characterized in that, A stable channel (131) for accommodating the first magnet (32) is provided on the base (13), and the stable channel (131) is communicated with or isolated from the guide chamber (12).

4. The underwater level switch according to claim 2, wherein A sewage discharge port (151) communicating the guide chamber (12) with the outside is provided on the lower housing (15); and / or a plurality of through holes (152) communicating with the guide chamber (12) are provided on the side wall of the lower housing (15).

5. The underwater liquid level switch according to claim 1, characterized in that, The floating body (31) includes: a floating block (311), a first counterweight block (312), and a bracket (313). Both the floating block (311) and the first counterweight block (312) are detachably installed on the bracket (313), and the first magnet (32) is detachably installed at one end of the bracket (313) close to the second magnet (33).

6. The underwater liquid level switch according to claim 5, characterized in that, The floating block (311) is a hollow sphere, ellipse, or polygon.

7. The underwater liquid level switch according to claim 5, characterized in that, The floating body (31) further includes a second counterweight block (314) detachably installed on the bracket (313).

8. The underwater liquid level switch according to claim 2, wherein, A first contact (41) is provided on the circuit module (4). The trigger switch (34) includes a trigger bracket (341), a second contact (342), and an elastic member (343). The trigger bracket (341) is mounted on the base (13), and the second magnet (33) is slidably connected to the trigger bracket (341); the second contact (342) is mounted on the second magnet (33); the elastic member (343) is mounted between the second magnet (33) and the base (13) to control the separation or contact between the first contact (41) and the second contact (342).

9. The underwater level switch according to claim 2, characterized in that, The base (13), the upper housing (14), and the lower housing (15) are all cylindrical. Sealing rings are mounted between the upper housing (14) and the lower housing (15) and the base (13); and / or a seal (5) is extrusion-sealed between the upper housing (14) and the cable (2).

10. The underwater liquid level switch according to claim 2, characterized in that, The upper housing (14) includes a plurality of sleeve shells (141). The plurality of sleeve shells (141) are sequentially sleeved on the base (13) from small to large, and a wire passing channel (142) allowing the cable (2) to pass through is formed between adjacent sleeve shells (141).

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