Underwater liquid level switch and sealing device thereof

Abstract

The invention discloses an underwater liquid level switch and a sealing device thereof, and the sealing device of the underwater liquid level switch comprises a housing, a sealing member and a fixing assembly. The upper part of the shell is provided with a sealing cavity for protecting electrical elements in the underwater liquid level switch, the lower part of the shell is provided with a mounting port connected with the underwater liquid level switch, and the shell is provided with an opening allowing a cable to pass through; the sealing piece comprises a plugging part which extends into the shell through the opening, and a limiting part which is partially inserted into the shell. According to the underwater liquid level switch, the sealing performance between the shell and the underwater liquid level switch is maintained, the overall sealing performance and protectiveness to electrical elements are improved, the service life is prolonged, the underwater liquid level switch can be conveniently installed in an underwater liquid level switch in the prior art, the connection strength between the underwater liquid level switch and a cable is improved, the service life is further prolonged, and the use cost is reduced. The device is suitable for a more complex environment and can be placed below a deeper liquid level, and the application range is widened.

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 and its sealing device. Background Art

[0002] There are various ways to implement the internal switch of a float ball. Commonly used ones are the microswitch method or the mercury switch method. By adopting the microswitch method inside the float ball, the whole structure consists of a steel ball, a connecting rod, and a microswitch. When the float ball switch rises or falls, the steel ball will fall or rise, and by touching the switch, the normally open or normally closed state is achieved by touching the microswitch. When the mercury switch method is adopted inside the float ball, when the float ball switch rises or falls, the position of the mercury will change; by connecting or disconnecting two metal poles inside the glass tube through the mercury, the normally open or normally closed state is achieved.

[0003] However, the above internal switch of the float ball has poor sealing performance, and liquid is likely to enter the inside of the switch, resulting in a short circuit of the internal electrical components. In particular, the gap between the energized cable and the housing is likely to cause the liquid to enter, thereby affecting the internal electrical components and the service life and measurement accuracy of the use. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an underwater liquid level switch and its sealing device.

[0005] The technical solution adopted by the present invention to solve its technical problems is to construct a sealing device for an underwater liquid level switch, including: a housing, a sealing member, and a fixing component; a sealing cavity for protecting the internal electrical components of the underwater liquid level switch is provided in the upper part of the housing, an installation port connected to the underwater liquid level switch is provided in the lower part of the housing, and an opening allowing the cable to pass through is provided on the housing; the sealing member includes: a plugging portion extending into the housing through the opening, and a limiting portion partially inserted into the housing; the fixing component is installed on the housing, and the plugging portion is tightly pressed to seal the opening by squeezing the limiting portion; a card hole allowing the cable to pass through is provided on the sealing member or between the sealing member and the opening.

[0006] Further, the sealing member has a flexible structure; and / or the cross-sectional area from the plugging portion to the limiting portion gradually increases.

[0007] Further, the card hole is provided on the axis of the sealing member; and / or a wire passing channel allowing the cable to pass through is provided in the housing.

[0008] Further, the inside of the wire passing channel is arranged in a labyrinth shape; and / or the sealing device of the underwater liquid level switch further includes a sealing glue provided between the cable and the housing, and a sealing gasket provided between the plugging portion and the housing.

[0009] Further, the fixing component is detachably and fixedly installed on the housing through a thread pair, a bolt or a buckle.

[0010] Further, the housing includes: a plurality of buckle covers, and a plurality of the buckle covers are nested and buckled on the underwater liquid level switch; the adjacent buckle covers are provided with wire passing holes that are axially offset from each other.

[0011] Further, the wire passing channel between the adjacent buckle covers is in an inverted V shape or an n shape.

[0012] In addition, the present invention further provides an underwater liquid level switch, including: the sealing device, the base, the sensor and the suspension device of the above underwater liquid level switch; the sealing device of the underwater liquid level switch is installed on the base through the installation opening of the housing; the sensor is installed in the sealing cavity and is electrically connected to the cable; the suspension device is suspended below the base and cooperates with the sensor to control the switch of the circuit.

[0013] Further, the suspension device includes: a suspension block, a counterweight block, a bracket and a magnet member that is magnetically induced with the sensor. The suspension block and the counterweight block are both detachably installed on the bracket, and the magnet member is detachably installed at one end of the bracket close to the sensor.

[0014] Further, after passing through the wire passing channel, the outer skin of the cable is removed, and a plurality of copper wires are inserted into the sealing cavity to be electrically connected to the sensor.

[0015] Implementing the present invention has the following beneficial effects:

[0016] In this application, the sealing portion is tightly pressed against the sealing opening by the extrusion limiting portion. The underwater liquid level switch in the prior art can also be installed on the housing through the installation opening, so that the housing cooperates with the outer shell of the underwater liquid level switch to wrap the electrical component part of the underwater liquid level switch, maintaining the sealing performance between the housing and the underwater liquid level switch, thereby improving the overall sealing performance and the protection of the electrical components, extending the service life, facilitating installation in the underwater liquid level switch of the prior art, also improving the connection strength between the underwater liquid level switch and the cable, further extending the service life, being applicable to more complex environments, being able to be lowered below a deeper liquid level, and expanding the applicable range. Description of the Drawings

[0017] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying 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.

[0018] In the drawings:

[0019] Figure 1 is a structural cross-sectional view of a sealing device of an underwater liquid level switch provided by an embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view of a wire passing channel provided by an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the installation position of a seal provided by an embodiment of the present invention;

[0022] Figure 4 is a structural cross-sectional view of a seal and a fixing assembly provided by an embodiment of the present invention;

[0023] Figure 5 is a structural cross-sectional view of the sealing device of the underwater liquid level switch installed on the underwater liquid level switch provided by an embodiment of the present invention;

[0024] Figure 6 is a schematic structural diagram of an underwater liquid level switch provided by an embodiment of the present invention;

[0025] Figure 7 is a cross-sectional view of an underwater liquid level switch provided by an embodiment of the present invention;

[0026] Figure 8 is a cross-sectional view of a suspension device provided by an embodiment of the present invention.

[0027] Description of the marks in the figure

[0028] Underwater liquid level switch 1, housing 2, sealing cavity 21, opening 22, wire passing channel 23, cover 24, wire passing hole 25, installation port 26, seal 3, blocking part 31, limiting part 32, clamping hole 33, fixing assembly 4, cable 5, sealant 6, gasket 7, base 11, sensor 12, suspension device 13, suspension block 131, counterweight block 132, bracket 133, magnet member 134. Detailed implementation manners

[0029] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments 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 terms such as "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 drawings, with a specific orientation structure and operation, and are only for the convenience of describing the present technical solution, rather than indicating that the indicated devices or elements 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 defined and limited, terms such as "installed", "connected", "coupled", "fixed", "set", etc. 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 communication inside 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. may 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, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, 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 - 5, in the first embodiment of the present invention, a sealing device for an underwater liquid level switch includes: a housing 2, a sealing member 3, and a fixing assembly 4. The upper part of the housing 2 is provided with a sealing cavity 21 for protecting the internal electrical components of the underwater liquid level switch 1. The lower part of the housing 2 is provided with an installation opening 26 connected to the underwater liquid level switch. The housing 2 is provided with an opening 22 allowing a cable 5 to pass through. The sealing member 3 includes: a plugging portion 31 extending into the housing 2 through the opening 22, and a limiting portion 32 partially inserted into the housing 2. The fixing assembly 4 is installed on the housing 2, and the plugging portion 31 is tightly pressed against the opening 22 by squeezing the limiting portion 32. A card hole 33 allowing the cable 5 to pass through is provided on the sealing member 3 or between the sealing member 3 and the opening 22.

[0033] In this application, the sealing member 3 includes: a plugging portion 31 extending into the housing 2 through the opening 22, and a limiting portion 32 partially inserted into the housing 2. The fixing assembly 4 is installed on the housing 2, and the plugging portion 31 is tightly pressed against the opening 22 by squeezing the limiting portion 32. Among them, the cable 5 passes through the opening 22 and enters the sealing cavity 21 of the housing 2 to be electrically connected to the internal electrical components of the underwater liquid level switch 1. Then, the sealing member 3 is placed at the opening 22. After that, the underwater liquid level switch 1 in the prior art can be installed on the housing 2 through the installation opening 26, so that the housing 2 cooperates with the outer shell of the underwater liquid level switch 1 to wrap the electrical component part of the underwater liquid level switch 1 and maintain the sealing between the housing 2 and the underwater liquid level switch 1. Then, the fixing assembly 4 is installed on the housing 2. During the installation process, the plugging portion 31 is squeezed by the limiting portion 32, so that the gap between the plugging portion 31 and the limiting portion 32 seals the gap between the opening 22 and the cable 5 during the squeezing process, keeping good sealing in the sealing cavity 21 of the housing 2, playing a role of mechanical sealing for the cable 5. Under the action of the fixing assembly 4, internal contraction sealing is achieved to form a reliable mechanical seal. Through the extrusion deformation of the sealing member 3, part of the cable 5 can also be squeezed and fixed at the opening 22, thereby keeping the cable 5 relatively stationary with respect to the housing 2. Furthermore, the cable 5 entering the housing 2 is kept relatively stationary with respect to the entire underwater liquid level switch 1, realizing a reliable fixed connection, and ensuring that the cable 5 can bear the weight of the underwater liquid level switch 1 for a long time without being damaged. Thereby improving the overall sealing performance and the protection of electrical components, extending the service life, being convenient for installation in the underwater liquid level switch 1 of the prior art, also improving the connection strength between the underwater liquid level switch 1 and the cable 5, further extending the service life, being applicable to more complex environments, being able to be lowered to a deeper liquid level, and expanding the applicable range.

[0034] Among them, when the sealing member 3 is squeezed by the fixing assembly 4 at the opening 22, the gap between the fixing assembly 4 and the housing 2 can also be sealed during the squeezing process, further improving the sealing performance in the sealing cavity 21, being applicable to more usage environments, and also saving the manufacturing cost.

[0035] By adding a sealing device for the underwater liquid level switch to the existing underwater liquid level switch 1, it is possible to save costs, be more environmentally friendly, facilitate installation, improve the protection of internal electrical components, and expand the applicable range.

[0036] Please refer to Figures 1 - 5 , in some embodiments, the seal 3 has a flexible structure.

[0037] In this application, since the seal 3 has a flexible structure, the flexible seal 3 has better ductility. When the fixing component 4 presses it, it can more fully fill the gap between the cable 5 and the opening 22. The seal 3 with a flexible structure can be made of rubber, polyurethane or other waterproof and flexible plastic materials. By using the flexible structure of the seal 3, it can deform after being pressed by the fixing component 4, making it more tightly block the gap between the cable 5 and the opening 22, firmly pressing part of the cable 5 at the opening 22, thereby improving the connection strength between them, being applicable to more usage environments, and facilitating extrusion installation.

[0038] Please refer to Figures 1 - 5 , in some embodiments, the cross-sectional area of the blocking portion 31 to the limiting portion 32 gradually increases.

[0039] In this application, since the cross-sectional area of the blocking portion 31 to the limiting portion 32 gradually increases, the lower blocking portion 31 is convenient to insert into the opening 22 for limiting. When the entire seal 3 is pressed, it prevents displacement between the blocking portion 31 and the limiting portion 32 and the opening 22, enabling it to more labor-saving and convenient to tightly seal the gap between the cable 5 and the opening 22 with the blocking portion 31. Among them, the gradually increasing cross-sectional area of the blocking portion 31 to the limiting portion 32 can be applicable to openings 22 with different diameters, expand the applicable range, and can also reduce the processing accuracy of the opening 22, thereby reducing the manufacturing cost, reducing the labor intensity. Through the seal 3 with a gradually increasing cross-sectional area, it can adaptively seal between the cable 5 and the opening 22, making the operation more convenient, reducing the installation difficulty, and improving the installation efficiency.

[0040] Please refer to Figures 1 - 5 , in some embodiments, the card hole 33 is provided on the axis of the seal 3.

[0041] In this application, the card hole 33 is arranged on the axis of the seal 3. After the cable 5 enters the housing 2 through the card hole 33 on the central axis, after the operator squeezes the seal 3 through the fixing component 4, the squeezed seal 3 will shrink its card hole 33, so that the part of the cable 5 passing through the card hole 33 is tightly squeezed in the card hole 33, thereby improving the connection strength between the cable 5 and the seal 3. Since the seal 3 is also squeezed by the fixing component 4 at the opening 22 of the housing 2, the connection strength between the entire cable 5 and the housing 2 is indirectly improved. The card hole 33 opened on the axis of the seal 3 can increase the contact area with the cable 5, so that after the seal 3 is squeezed, it can more tightly wrap the passing cable 5, which not only improves the sealing performance with the cable 5, but also improves the connection strength with the cable 5.

[0042] Please refer to Figures 1 - 5 , in some embodiments, a wire passing channel 23 allowing the cable 5 to pass through is arranged in the housing 2.

[0043] In this application, a wire passing channel 23 allowing the cable 5 to pass through is arranged in the housing 2. After the cable 5 enters the housing 2 through the opening 22, it reaches the electrical components inside the sealing cavity 21 through the wire passing channel 23 for electrical connection therebetween. The wire passing channel 23 can prevent the phenomenon that the cable 5 is wound and damaged inside the housing 2, make the arrangement of the cable 5 more regular, thereby improving safety, making the heat dissipation of the cable 5 better, and extending the service life.

[0044] Please refer to Figure 1 and Figure 2 , in some embodiments, the inside of the wire passing channel 23 is arranged in a labyrinth shape.

[0045] In this application, since the inside of the wire passing channel 23 is arranged in a labyrinth shape, the stability of the cable 5 in the wire passing channel 23 can be improved by the labyrinth shape of the inside of the wire passing channel 23, so that the cable 5 is more firmly installed with the housing 2 and the service life is extended. The labyrinth-shaped wire passing channel 23 can play a certain waterproof role. When water flows into the housing 2, the labyrinth-shaped wire passing channel 23 can block the water flow, prevent the water flow from directly reaching the sealing cavity 21, gain a certain maintenance time, reduce the risk of water flow soaking the electrical components, further improve safety and service life, and save maintenance costs.

[0046] Please refer to Figure 3 and Figure 4 , in some embodiments, the sealing device of the underwater level switch 1 further includes a sealant 6 arranged between the cable 5 and the housing 2, and a gasket 7 arranged between the plugging part 31 and the housing 2.

[0047] In this application, a sealant 6 is provided between the cable 5 and the housing 2. By using the sealant 6, the sealing performance and connection strength between the cable 5 and the housing 2 can be further improved. When the sealant 6 is flowing, it is injected between the cable 5 and the opening 22. In the flowing state, the sealant 6 will automatically block the gap between the cable 5 and the opening 22. After the sealant 6 dries, the cable 5 can be firmly sealed at the opening 22, improving the sealing performance and facilitating operation. Among them, after the cable 5 passes through the wire passing channel 23 and is connected to the electrical component, the sealant 6 can also be used to fill the wire passing channel 23, further improving the connection strength and sealing performance, and preventing the cable 5 from oxidation, thereby extending the service life.

[0048] In this application, a gasket 7 is provided between the plugging part 31 and the housing 2. The gasket 7 is located at the top of the sealant 6. By the extrusion of the plugging part 31, the gasket 7 is firmly pressed and sealed between the housing 2 and the cable 5. During the extrusion process, the plugging part 31 can extend into the inner diameter of the gasket 7. With continuous extrusion and penetration, the plugging part 31 can tighten the gasket 7, further improving the sealing performance and firmness, and facilitating installation.

[0049] Please refer to Figures 1 - 5 , in some embodiments, the fixing component 4 is detachably and fixedly installed on the housing 2 through a thread pair, a bolt or a buckle.

[0050] In this application, the fixing component 4 is detachably and fixedly installed on the housing 2 by using a thread pair. Using a thread pair facilitates the installation of the fixing component 4 on the housing 2. Also, by rotating the fixing component 4, the extrusion strength on the seal 3 can be adjusted, facilitating installation adjustment. By rotating the fixing component 4, the seal 3 can be slowly extruded, reducing the labor intensity, and enabling quick, stable and labor-saving extrusion of the seal 3, improving the installation efficiency.

[0051] In this application, the fixing component 4 is detachably and fixedly installed on the housing 2 by using a bolt. The bolt can save certain manufacturing costs and is convenient for finding accessories for replacement. Through the mutual cooperation of multiple bolts, the seal 3 can be more tightly extruded and sealed on the opening 22, further improving the sealing performance.

[0052] In this application, the fixing component 4 is detachably and fixedly installed on the housing 2 by using a buckle. The buckle can be a groove provided outside the housing 2, and a protrusion cooperating with the groove is provided on the fixing component 4. When the fixing component 4 is installed on the housing 2, the protrusion just gets stuck in the groove for mutual limitation. Thus, the buckle is convenient for operation and can quickly and conveniently fix the fixing component 4 on the housing 2, improving the installation efficiency.

[0053] Please refer to Figures 1 - 5, in some embodiments, the housing 2 includes: a plurality of snap covers 24, and the plurality of snap covers 24 are nested and snapped onto the underwater level switch 1; wire passing holes 25 that are axially offset from each other are provided on adjacent snap covers 24.

[0054] In this application, a plurality of snap covers 24 are nested and snapped onto the underwater level switch 1; wire passing holes 25 that are axially offset from each other are provided on adjacent snap covers 24, and the gaps between the plurality of snap covers 24 and the wire passing holes 25 form a wire passing channel 23. By using the nested snap - fitting of the plurality of snap covers 24 onto the underwater level switch 1, the cable 5 can first be passed through their respective wire passing holes 25, and then the snap covers 24 can be installed on the underwater level switch 1. During installation, first install the innermost snap cover 24 on the underwater level switch 1, and then sequentially sleeved the adjacent snap covers 24 onto the underwater level switch 1, thereby facilitating the wiring layout of the cable 5 and improving the efficiency of installing the cable 5, and facilitating the operation. Among them, through the installation method of threading the cable first and then installing the snap covers 24, during the installation process, the gap between adjacent snap covers 24 can be made smaller than the diameter of the cable 5, and the installed adjacent snap covers 24 can squeeze the cable 5 in the wire passing channel 23, further improving the connection strength and sealing performance between the cable 5 and the housing 2, and facilitating the operation.

[0055] In this application, wire passing holes 25 that are axially offset from each other are provided on adjacent snap covers 24, so that the cross - section of the wire passing channel 23 is wavy. In this way, when water infiltrates into the interior of the outermost snap cover 24, the axially offset wire passing holes 25 can use the side walls of the snap covers 24 to block the infiltrated water, preventing the infiltrated water from directly contacting the internal electrical components. Through layer - by - layer blocking, the sealing performance is further improved, the service life is extended, it is applicable to deeper and more complex liquid level environments, and the scope of use is expanded.

[0056] Please refer to Figures 1 - 5 , in some embodiments, the wire passing channel 23 between adjacent snap covers 24 is in an inverted V - shape or an n - shape.

[0057] In the present application, the wire passing channel 23 between adjacent snap covers 24 is in an inverted V shape or an n shape. The entire underwater level switch 1 does not flip. Since several snap covers 24 are installed in an inverted state, under the action of air pressure, even if all external seals fail, the leaked moisture medium will form a liquid level layer at the bottom of the inverted V shape or n shape between adjacent snap covers 24. When the liquid level further rises, even if the liquid level layer exceeds the first-layer inverted V shape or n shape, the leaked moisture medium will be blocked by the second-layer inverted V shape or n shape. After the leaked moisture medium 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 2 from leaking out. The internal air pressure will prevent the leaked moisture medium from further seeping in. Thus, the immersed moisture is blocked outside the innermost snap cover 24, achieving multiple sealing protections during the laying process of the cable 5, further improving the sealing performance and the applicable range, and ensuring the accuracy of the measured value and the sensitivity of the reaction of the underwater level switch 1.

[0058] Please refer to Figures 1 - 4 、and Figures 6 - 8 , the present invention also provides an underwater level switch, including: the sealing device of the above-mentioned underwater level switch, a base 11, a sensor 12, and a suspension device 13. The sealing device of the underwater level switch is installed on the base 11 through the installation opening 26 of the housing 2. The sensor 12 is installed in the sealing cavity 21 and is electrically connected to the cable 5. The suspension device 13 is suspended below the base 11 and cooperates with the sensor 12 to control the switch of the circuit.

[0059] In the present application, the suspension device 13 is suspended below the base 11 and magnetically cooperates or distance-cooperates with the sensor 12 to control the switch of the circuit. This enables the sensor 12 to be independently installed in the sealing cavity 21, thereby improving the sealing effect of the sealing cavity 21 on the internal sensor 12 and reducing the intrusion of moisture medium. The entire underwater level switch 1 can be completely immersed below the liquid level, applicable to more usage scenarios. After installation, the base 11 and the sensor 12 remain stationary. The suspension device 13 can independently exist below the base 11 and can float up or down with the fluctuation of the liquid level and cooperate with the sensor 12. When the suspension device 13 moves within the set distance of the sensor 12, the sensor 12 opens or closes the electrical connection of the cable 5. Thus, the entire device is controlled by the magnetic cooperation or distance cooperation between the sensor 12 and the suspension device 13. The independently suspended suspension device 13 will not get entangled due to multiple changes in the liquid level, thereby improving the operating stability. After long-term use, the suspension device 13 can still maintain a good cooperation with the sensor 12, thereby extending the service life and facilitating maintenance.

[0060] Among them, a distance-type laser sensor can be used between the suspension device 13 and the sensor 12, with a more sensitive and rapid response. A magnetic attraction cooperation can also be adopted between the suspension device 13 and the sensor 12, enabling the sensor 12 to control the entire device, with a lower cost, more durability, suitability for more usage environments, and stronger anti-interference ability.

[0061] Among them, the sealing device of the underwater liquid level switch improves the overall sealing performance and the protection of electrical components, extends the service life, also improves the connection strength between the underwater liquid level switch 1 and the cable 5, further extends the service life, is suitable for more complex environments, can be lowered to a deeper liquid level, and expands the applicable range.

[0062] Please refer to Figures 6 - 8 , in some embodiments, the suspension device 13 includes: a suspension block 131, a counterweight block 132, a bracket 133, and a magnet member 134 that magnetically senses with the sensor 12. The suspension block 131 and the counterweight block 132 are both detachably mounted on the bracket 133, and the magnet member 134 is detachably mounted at one end of the bracket 133 close to the sensor 12.

[0063] In this application, since the suspension block 131 and the counterweight block 132 are both detachably mounted on the bracket 133, and the magnet member 134 is detachably mounted at one end of the bracket 133 close to the sensor 12, the entire suspension device 13 can stably move in the axial direction below the base 11 through the bracket 133, improving sensitivity. The suspension block 131 can drive the entire suspension device 13 to suspend below the base 11 in the water medium, avoiding entanglement. During the operation of the entire underwater liquid level switch 1, it is more stable. The counterweight block 132 therein can determine the installed weight according to the usage environment. The heavier the installed weight, the more suitable it is for an environment with a deeper liquid level and stronger buoyancy. On the contrary, the lighter the installed weight, the more suitable it is for an environment with a shallower liquid level and weaker buoyancy, expanding the applicable range. The magnet member 134 therein can use a permanent magnet, which is more durable, not easily damaged, and saves the manufacturing cost.

[0064] Please refer to Figures 6 - 8 , in some embodiments, after passing through the wire passing channel 23, the cable 5 removes its outer skin, and several copper wires extend into the sealing cavity 21 to be electrically connected to the sensor 12.

[0065] In this application, after passing through the wire passing channel 23, the cable 5 removes its outer skin, and several copper wires extend into the sealing cavity 21 to be electrically connected to the sensor 12. The cable 5 without the outer skin will not cause moisture medium to enter the sealing cavity 21 along the inside of the cable 5 due to the damage of the outer skin of the cable 5. During long-term use, the risk of moisture medium intrusion is reduced, and the diameter of the wire passing hole 25 on the innermost layer of the cover 24 can also be reduced, further improving the sealing performance.

[0066] Among them, the outer skin of the cable 5 can also be removed after passing through the opening 22, which can effectively reduce the gap between the cover caps 24 and is beneficial to reducing the overall size of the underwater level switch 1. It is more compact and convenient for operation and installation at a suitable position.

[0067] Among them, the present application can also be provided with a radiation-proof lead layer on the housing 2, which can effectively prevent damage to the internal electrical components by nuclear radiation and ensure the stable operation of the underwater level switch 1 in a radiation environment.

[0068] It can be understood that the above embodiments only express the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention; it should be noted 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, all of which 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. A sealing device for an underwater liquid level switch, characterized in that, Comprising: A housing (2), a seal (3) and a fixing component (4); The upper part of the housing (2) is provided with a sealing cavity (21) for protecting the internal electrical components of the underwater level switch (1), the lower part of the housing (2) is provided with a mounting opening (26) connected to the underwater level switch, and the housing (2) is provided with an opening (22) allowing a cable (5) to pass through; The seal (3) includes: a plugging part (31) extending into the housing (2) through the opening (22), and a limiting part (32) partially inserted into the housing (2); The fixing component (4) is installed on the housing (2), and the plugging part (31) is pressed and sealed at the opening (22) by squeezing the limiting part (32); A card hole (33) allowing the cable (5) to pass through is arranged on the seal (3) or between the seal (3) and the opening (22).

2. The sealing device of the underwater liquid level switch according to claim 1, wherein, The seal (3) has a flexible structure; and / or the cross-sectional area from the plugging part (31) to the limiting part (32) gradually increases.

3. The sealing device of the underwater liquid level switch according to claim 1, characterized in that, The card hole (33) is arranged on the axis of the seal (3); and / or a wire passing channel (23) allowing the cable (5) to pass through is arranged in the housing (2).

4. The sealing device of the underwater liquid level switch according to claim 3, characterized in that, The inside of the wire passing channel (23) is arranged in a labyrinth shape; and / or the sealing device of the underwater level switch (1) further includes a sealant (6) arranged between the cable (5) and the housing (2), and a gasket (7) arranged between the plugging part (31) and the housing (2).

5. The sealing device of the underwater liquid level switch according to claim 1, characterized in that, The fixing component (4) is detachably and fixedly installed on the housing (2) through a thread pair, a bolt or a buckle.

6. The sealing device of the underwater liquid level switch according to claim 3, characterized in that, The housing (2) includes: a plurality of buckles (24), and the plurality of buckles (24) are sleeved and buckled on the underwater level switch (1); wire passing holes (25) that are axially offset from each other are arranged on adjacent buckles (24).

7. The sealing device of the underwater liquid level switch according to claim 6, characterized in that, The wire passing channel (23) between adjacent buckles (24) is in an inverted V shape or an n shape.

8. An underwater liquid level switch, characterized in that, Comprising: The sealing device of the underwater level switch according to any one of claims 1-7, a base (11), a sensor (12) and a suspension device (13); The sealing device of the underwater level switch is installed on the base (11) through the mounting opening (26) of the housing (2); The sensor (12) is installed in the sealing cavity (21) and is electrically connected to the cable (5); The suspension device (13) is suspended below the base (11) and cooperates with the sensor (12) to control the switch of the circuit.

9. The underwater liquid level switch according to claim 8, characterized in that, The suspension device (13) includes: a suspension block (131), a counterweight block (132), a bracket (133) and a magnet member (134) magnetically inductive with the sensor (12), the suspension block (131) and the counterweight block (132) are both detachably installed on the bracket (133), and the magnet member (134) is detachably installed at one end of the bracket (133) close to the sensor (12).

10. The underwater liquid level switch according to claim 9, wherein, After passing through the wire passing channel (23), the outer skin of the cable (5) is removed, and a number of copper wires are inserted into the sealed cavity (21) to be electrically connected to the sensor (12).

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