阅读说明：本技术 一种液位开关 (Liquid level switch ) 是由 姜夏旭 孙连锡 孟祥琦 于 2020-07-18 设计创作，主要内容包括：本发明涉及一种液位开关,包括安装在储罐上的安装座,所述安装座上设有导向孔,所述导向孔内活动安装有内导向杆,所述安装座上固定安装有微动开关,所述内导向杆的上端固定安装有内磁钢,所述内磁钢和所述微动开关之间设有向上运动时能触发所述微动开关的上驱动磁钢,所述上驱动磁钢的下端的磁极和所述内磁钢的上端的磁极相同；还包括在储罐内液位上升时,驱动内导向杆向上运动的浮动机构；浮动机构包括沉桶及拉力补偿机构,可避免因为密度不准确造成误报警；能有效提高控制的精度,而且可实现液位的在线自检和免拆卸维护。(The invention relates to a liquid level switch, which comprises a mounting seat arranged on a storage tank, wherein a guide hole is formed in the mounting seat, an inner guide rod is movably arranged in the guide hole, a microswitch is fixedly arranged on the mounting seat, inner magnetic steel is fixedly arranged at the upper end of the inner guide rod, upper driving magnetic steel capable of triggering the microswitch when moving upwards is arranged between the inner magnetic steel and the microswitch, and the magnetic pole at the lower end of the upper driving magnetic steel is the same as the magnetic pole at the upper end of the inner magnetic steel; the floating mechanism drives the inner guide rod to move upwards when the liquid level in the storage tank rises; the floating mechanism comprises a sinking barrel and a tension compensation mechanism, so that false alarm caused by inaccurate density can be avoided; the control precision can be effectively improved, and the on-line self-checking and the disassembly-free maintenance of the liquid level can be realized.)

1. A liquid level switch is characterized by comprising a mounting seat mounted on a storage tank, wherein a guide hole is formed in the mounting seat, an inner guide rod is movably mounted in the guide hole, a microswitch is fixedly mounted on the mounting seat, an inner magnetic steel is fixedly mounted at the upper end of the inner guide rod, an upper driving magnetic steel capable of triggering the microswitch when moving upwards is arranged between the inner magnetic steel and the microswitch, and the magnetic pole at the lower end of the upper driving magnetic steel is the same as the magnetic pole at the upper end of the inner magnetic steel; the floating mechanism drives the inner guide rod to move upwards when the liquid level in the storage tank rises.

2. The liquid level switch of claim 1, wherein the floating mechanism comprises a sinking member, a flexible connecting rope is arranged between the sinking member and the inner guide rod, the sinking member floats upwards when the liquid level in the storage tank reaches a certain height, and the tension compensation mechanism drives the guide rod to move upwards.

3. The level switch of claim 2, wherein the sink is a sink bucket.

4. The fluid level switch of claim 2, wherein the tension compensation mechanism comprises a spring sleeved outside the inner guide rod, a lower end of the spring is connected to a spring baffle, an upper end of the spring is connected to a lower surface of the mounting seat, and an adjustment mechanism is arranged between the spring baffle and the inner guide rod.

5. The level switch as defined in claim 4, wherein said adjustment mechanism includes a threaded hole formed in said spring plate, said inner guide rod having an external thread at a lower end thereof, said internal thread being threaded into said threaded hole in said spring plate.

6. The fluid level switch of claim 1, wherein the mounting block is provided with a sealing cap covering an upper end of the inner guide rod.

7. The liquid level switch as claimed in claim 4, wherein the lower surface of the mounting seat is provided with a spring protection tube sleeved outside the spring, the spring protection tube comprises a tube body and a lower end cover plugged at the lower opening of the tube body, the lower end cover is provided with a through hole for the inner guide rod to pass through, the spring and the spring baffle are located in the spring protection tube, and the inner guide rod passes through the tube body from the upper opening of the tube body and passes through the tube body from the through hole.

8. The liquid level switch of claim 7, wherein the lower surface of the mounting seat is provided with a mounting seat external thread, and the upper end of the spring protection tube is provided with a protection tube internal thread matched with the mounting seat external thread.

9. The liquid level switch of claim 1, further comprising a self-checking mechanism, wherein the self-checking mechanism comprises a self-checking rod, a sealing shell is arranged on the mounting seat, the self-checking rod is sleeved in the sealing shell and in clearance fit with the sealing shell, the self-checking rod can move up and down in the sealing shell, self-checking rod magnetic steel is installed at the lower end of the self-checking rod, a guide rod self-checking magnetic steel sleeved outside the inner guide rod is fixedly installed on the spring baffle, and one side magnetic pole of the self-checking rod magnetic steel close to the spring protection tube is mutually exclusive with the outer side magnetic pole of the guide rod self-checking magnetic steel.

10. The fluid level switch of claim 3, wherein the dip tank is provided with a counterweight adjustment mechanism.

Technical Field

The invention relates to a liquid level switch.

Background

At present to some big crude oil or viscosity medium storage tanks or retort, because of its viscosity is big, most float formula level gauge can't use, this application environment adopts the buoy pointer type level gauge of on-the-spot mechanical pointer demonstration more, the storage is too high, can cause the potential safety hazard of excessive filling, go to observe the measurement liquid level and make the judgement through people's naked eye pointer scale, the purpose of manual pump valve that cuts off reaching the interior raw materials liquid level height of control storage tank, this kind of operating means has brought very big cost of labor, and because the storage tank is generally high, also do not be favorable to the observation, its factor of safety is also not high, mostly rely on-the-spot personnel's responsibility heart.

At present, a liquid level switch can drive a set of magnetic steel to move up and down through the change of buoyancy of an inner float, drive a set of lever bracket at the side to act, and drive a reed switch or a microswitch contact to be closed so as to achieve the purpose of liquid level control. However, the structure has a plurality of defects, which are specifically shown in the following steps:

Disclosure of Invention

The invention aims to solve the technical problem of providing a liquid level switch which can effectively improve the control precision, is suitable for measuring liquid with lower density, has the function of self-holding memory, and can realize the on-line self-checking of the liquid level and the disassembly-free maintenance.

In order to solve the technical problems, the technical scheme of the invention is as follows: a liquid level switch comprises a mounting seat mounted on a storage tank, wherein a guide hole is formed in the mounting seat, an inner guide rod is movably mounted in the guide hole, a microswitch is fixedly mounted on the mounting seat, an inner magnetic steel is fixedly mounted at the upper end of the inner guide rod, an upper driving magnetic steel capable of triggering the microswitch when moving upwards is arranged between the inner magnetic steel and the microswitch, and the magnetic pole at the lower end of the upper driving magnetic steel is the same as the magnetic pole at the upper end of the inner magnetic steel; the floating mechanism drives the inner guide rod to move upwards when the liquid level in the storage tank rises.

According to the preferable technical scheme, the floating mechanism comprises a sinking piece, a flexible connecting rope is arranged between the sinking piece and the inner guide rod, the liquid level in the storage tank reaches a certain height, the sinking piece floats upwards, and the tension compensation mechanism drives the guide rod to move upwards.

As a preferred technical scheme, the sinking piece is a sinking barrel.

As a preferred technical scheme, the tension compensation mechanism comprises a spring sleeved outside the inner guide rod, the lower end of the spring is connected to a spring baffle, the upper end of the spring is connected to the lower surface of the mounting seat, and an adjusting mechanism is arranged between the spring baffle and the inner guide rod.

As a preferred technical scheme, the adjusting mechanism comprises a threaded hole formed in the spring baffle, an external thread is arranged at the lower end of the inner guide rod, and the external thread of the inner guide rod is screwed in the threaded hole in the spring baffle.

Preferably, a sealing cover is arranged on the mounting seat and covers the upper end of the inner guide rod.

As the preferred technical scheme, the external thread is also screwed with a nut which is propped against the lower surface of the spring baffle.

According to the preferable technical scheme, the lower surface of the mounting seat is provided with a spring protection tube sleeved outside the spring, the spring protection tube comprises a tube body and a lower end cover plugged at the lower tube opening of the tube body, a through hole for the inner guide rod to penetrate out is formed in the lower end cover, the spring and a spring baffle are located in the spring protection tube, and the inner guide rod penetrates into the tube body from the upper tube opening of the tube body and penetrates out of the tube body from the through hole. The nut is also located within the spring protection tube,

according to the preferable technical scheme, the lower surface of the mounting seat is provided with mounting seat external threads, and the upper end of the spring protection tube is provided with protection tube internal threads matched with the mounting seat external threads.

As preferred technical scheme, still include self-checking mechanism, self-checking mechanism includes the self-checking pole, be equipped with the seal shell on the mount pad, the self-checking pole cover is in the seal shell and with seal shell clearance fit, the self-checking pole can reciprocate in the seal shell, the self-checking pole magnet steel is installed to the lower extreme of self-checking pole, fixed mounting has the cover on the spring shield and is in the outer guide bar self-checking magnet steel of interior guide bar, one side magnetic pole that self-checking pole magnet steel is close to spring protection pipe and the outside magnetic pole of guide bar self-checking magnet steel repel each other.

As the preferred technical scheme, a counterweight adjusting mechanism is arranged on the sinking barrel.

By adopting the technical scheme, the liquid level switch comprises an installation base arranged on a storage tank, wherein a guide hole is formed in the installation base, an inner guide rod is movably arranged in the guide hole, a micro switch is fixedly arranged on the installation base, an inner magnetic steel is fixedly arranged at the upper end of the inner guide rod, an upper driving magnetic steel which can trigger the micro switch when moving upwards is arranged between the inner magnetic steel and the micro switch, and the magnetic pole at the lower end of the upper driving magnetic steel is the same as the magnetic pole at the upper end of the inner magnetic steel; the floating mechanism drives the inner guide rod to move upwards when the liquid level in the storage tank rises; the floating mechanism comprises a sinking barrel and a tension compensation mechanism, so that false alarm caused by inaccurate density can be avoided; the control precision can be effectively improved, and the on-line self-checking and the disassembly-free maintenance of the liquid level can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a sectional view taken along line A-A in FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at I;

FIG. 4 is an enlarged view of a portion of FIG. 2 at II;

fig. 5 is a partial enlarged view at III in fig. 2.

Detailed Description

As shown in fig. 1 to 5, a liquid level switch comprises an installation base 1 installed on a storage tank, wherein a guide hole is formed in the installation base 1, an inner guide rod 3 is movably installed in the guide hole, a micro switch 4 is fixedly installed on the installation base, an inner magnetic steel 5 is fixedly installed at the upper end of the inner guide rod 1, an upper driving magnetic steel 6 capable of triggering the micro switch when moving upwards is arranged between the inner magnetic steel 5 and the micro switch 4, and the magnetic pole at the lower end of the upper driving magnetic steel 6 is the same as the magnetic pole at the upper end of the inner magnetic steel 5; the floating mechanism drives the inner guide rod to move upwards when the liquid level in the storage tank rises. The inner magnetic steel and the upper driving magnetic steel adopt a magnetic coupling driving principle, the inner magnetic steel is completely isolated from a micro switch cavity, the upper and lower structural designs of the inner magnetic steel and the upper driving magnetic steel directly act on the contact position of the micro switch, a driving assembly is reduced, a self-holding memory function is achieved, and the safety and reliability performance are higher.

The floating mechanism comprises a sinking piece, the sinking piece is a sinking barrel 7, a flexible connecting rope 11 is arranged between the sinking barrel 7 and the inner guide rod 3, the liquid level in the storage tank reaches a certain height, the sinking barrel floats upwards, and the tension compensation mechanism drives the guide rod to move upwards. Interior guide bar pipe with sink bucket flexonics, sink the bucket and can realize looking for certainly, interior guide bar upper end is difficult to eccentric card and dies to cause the trouble. The flexible connection rope can prevent that the card that hard rod connection caused from dying, also can realize the alarm position adjustment through the length of adjusting the flexible connection rope simultaneously.

The flexible connection rope connection structure is not only suitable for the installation mode of the lateral additional outer buoy, but also can adopt the mode of directly installing at the top of the measurement storage tank, and meanwhile, the installation requirement on the neutrality is far lower than that of a hard connection rod structure, so that the application range of the technical scheme is effectively expanded.

The tension compensation mechanism comprises a spring 12 sleeved outside the inner guide rod, the lower end of the spring 12 is connected to a spring baffle 13, the upper end of the spring 12 is connected to the lower surface of the mounting seat 1, and an adjusting mechanism is arranged between the spring baffle 13 and the inner guide rod.

The micro switch and the inner magnetic steel adopt an up-and-down straight-through type magnetic coupling principle, when the liquid level rises, the buoyancy of the sinking barrel is increased, the inner guide rod pipe moves upwards under the action of the downward pulling force of the sinking barrel and the upward pulling force of the spring, the like magnetic pole repels the upper driving magnetic steel at the lower end of the micro switch to close the micro switch contact to act and keep the micro switch contact all the time until the liquid level drops below an alarm position point, and the upper driving magnetic steel can disconnect the micro switch contact due to the action of gravity, so that the self-holding.

The tension compensation mechanism can prevent the micro switch from not acting due to the over-small buoyancy.

The adjusting mechanism comprises a threaded hole formed in the spring baffle 13, an external thread is arranged at the lower end of the inner guide rod 3, and the external thread of the inner guide rod 13 is screwed in the threaded hole in the spring baffle. Through adjustment mechanism can be convenient the adjustment compensation power size, applicable in more dense changes or the accurate adjustment of alarm position, the compensation power that the spring provided simultaneously can be applied to and adapt to bigger viscosity demand.

The floating mechanism comprises a sinking barrel 7, and a balance weight adjusting mechanism is arranged on the sinking barrel 7. The barrel sink 7 comprises an upper end enclosure 8, a lower end enclosure 9 and a barrel sink pipe 10 arranged between the upper end enclosure and the lower end enclosure.

The sinking barrel replaces a traditional hollow floating ball, the sinking barrel adopts a solid or thick-walled pipe, and the counterweight adjusting mechanism can adopt a solid piece, so that the gravity increase caused by the internal leakage of a cavity of a hollow structure is avoided. The heavy barrel is heavy in weight, thick in wall thickness or directly adopts a solid structure, the pressure resistance and the self-finding neutral performance of the heavy barrel are superior to those of a hollow floating ball, an internal guide rod is not needed, the failure that the floating ball cannot act due to viscosity can be reduced, and the heavy barrel is more suitable for high-viscosity, high-temperature and high-pressure measurement media.

The counterweight adjusting mechanism comprises a counterweight threaded rod 22 welded at the lower end of the lower end enclosure 9, and a plurality of solid counterweight blocks 23 can be assembled on the counterweight threaded rod 22. The device can realize the fine adjustment of the alarm action position by adjusting the quality of the sinking barrel, is suitable for measuring different density media or correcting the deviation of the sinking barrel immersed in the alarm position of the depth of the measured liquid caused by density change, and improves the accuracy of alarm control.

The upper end of the flexible connecting rope is connected to one end, penetrating out of the pipe body downwards, of the inner guide rod, and the lower end of the flexible connecting rope is connected to the sinking barrel.

Therefore, the relative position of the lower end of the spring and the inner guide rod can be adjusted by adjusting the position of the spring baffle, the tension compensation mechanism can compensate the tension of the heavy barrel in real time, and implementable conditions are provided for the heavy barrel which adopts a thick-walled pipe or solid design. The spring can carry out pulling force compensation to heavy bucket gravity increase, and the spring can be applicable to the less measuring liquid of density simultaneously. The adjustable design is to be suitable for the heavy bucket of different qualities.

And a nut 14 which is abutted against the lower surface of the spring baffle is screwed on the external thread.

And a sealing cover 15 for covering the upper end of the inner guide rod is arranged on the mounting seat. The liquid level switch adopts a non-contact magnetic coupling measurement principle, so that the liquid controlled by measurement can be completely isolated from the electronic control switch, the purposes of high pressure resistance and high temperature resistance are achieved, and the safety performance of the switch is improved.

The invention is mainly applied to the field of automatic alarm control for measuring high-temperature and high-pressure or relatively viscous liquid level storage tanks, and can realize a liquid level switch with automatic alarm or control function. The switch adopts a non-contact magnetic coupling principle, and can realize high-temperature and high-pressure resistant application occasions. The design comprises a barrel sinking mechanism and a tension compensation mechanism, so that false alarm caused by inaccurate density can be avoided; the spring protection tube is arranged, so that the problem that the failure cannot be alarmed due to the fact that the original design is easy to clamp can be solved; the sinking barrel and the inner guide rod are arranged to be of a steel wire rope flexible connection structure, so that the liquid level alarm position can be conveniently adjusted, the liquid level alarm position can be adjusted, and the locking caused by the connection of a hard rod can be prevented; the force transmission structure of the microswitch and the thrust magnetic steel is optimized, the self-holding memory function of liquid level alarm is realized, the control stability is effectively improved, and the safety performance of interlocking control is improved; a set of self-checking device capable of realizing self-checking without disassembly is added, so that the daily production and maintenance efficiency cost are facilitated.

The lower surface of mount pad is equipped with the cover and is in spring protection pipe 16 outside the spring, the spring protection pipe includes that body and shutoff are in the lower end cover 17 of the lower mouth of pipe department of body, be equipped with the confession on the lower end cover 17 the via hole 18 that the interior guide bar wore out, spring baffle are located in the spring protection pipe, interior guide bar 3 is followed the last mouth of pipe of body penetrates the body and follow the via hole is worn out the body. The nut 14 is also located within the spring protection tube.

The lower surface of mount pad is equipped with the mount pad external screw thread, the upper end of spring protection tube 16 be equipped with mount pad external screw thread complex's protection tube internal thread.

In order to prevent that spring 3 from deforming too greatly and causing elastic failure, spring protection tube 16 has been increased in the design, and spring protection tube 16's upper end is equipped with the protection tube internal thread, can direct threaded connection on the mount pad external screw thread, and lower end cover 17 of taking the hole is designed to the lower extreme at spring protection tube, and when spring 3's elastic deformation was too big, can carry out spacing protection through the lower end cover, and the threaded connection structure of this spring protection tube design also conveniently dismantles simultaneously.

When the liquid level of liquid in a measuring storage tank rises, the volume of a sinking barrel immersed in the liquid and immersed in the liquid is increased, the buoyancy of the sinking barrel is increased, a spring of a tension compensation mechanism drives an inner guide rod to move upwards, an inner magnetic steel at the upper end of the inner guide rod moves upwards, when the inner magnetic steel moves upwards to a certain distance, an upper driving magnetic steel is repelled by homopolar magnetic force to close a micro switch contact, the upper driving magnetic steel is always kept in a state of closing the micro switch along with the continuous rising of the liquid level, and after the liquid level falls, the upper driving magnetic steel falls under the action of self gravity, so that the contact of the micro switch is disconnected, in order to prevent the damage and failure caused by the overlarge deformation of the spring in the tension compensation mechanism due to the overlarge mass of the sinking barrel or the overlarge falling of the liquid level, a lower end cover is designed, and a spring protection pipe can, the centering performance of the spring and the inner guide rod can be ensured, and the spring protection tube is convenient to install and maintain due to the threaded detachable structure.

Still include self-checking mechanism, self-checking mechanism includes self-checking pole 21, be equipped with sealed shell 18 on the mount pad, self-checking pole 21 cover in the sealed shell and with sealed shell clearance fit, self-checking pole 21 can reciprocate in the sealed shell 18, self-checking pole magnet steel 19 is installed to self-checking pole's lower extreme, fixed mounting has the cover on the spring baffle is in the outer guide bar self-checking magnet steel 20 of interior guide bar, one side magnetic pole that self-checking pole magnet steel 20 is close to the spring protection tube and the outside magnetic pole of guide bar self-checking magnet steel repel each other. The self-checking pole is located the seal shell, the purpose is kept apart in seal shell inner chamber and the storage tank completely, when needs self-checking or maintenance operation, make self-checking pole 17 up-and-down motion in the seal shell, notice the effect that the break-make of observing micro-gap switch realized the self-checking, avoided the on-the-spot with the whole condition of dismantling the maintenance of mount pad 1, if interior guide bar 3 if have slight card pause simultaneously, also can realize the purpose of maintaining through self-checking pole non-contact magnetic coupling repulsion, because the mode that wholly adopts non-contact to keep apart completely, avoided the complete hidden danger of revealing.

And a self-checking rod locking mechanism is arranged between the self-checking rod and the sealing shell. The self-checking rod locking mechanism can lock the position of the self-checking rod, and when self-checking is not performed, the self-checking rod magnetic steel is far away from the guide rod self-checking magnetic steel, so that the influence on the movement of the inner guide rod is avoided. Self-checking pole locking mechanism can adopt to rotate to install sealed shell open-ended stop nut, the self-checking pole have with stop nut complex external screw thread, through rotating stop nut, adjust self-checking pole and stop nut's relative position.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.