CN219084187U - Short-range capacitive liquid level switch - Google Patents

Abstract

The utility model discloses a short-range capacitive liquid level switch, which comprises a rod body and a controller, wherein liquid inlet holes are formed in the bottom end of the rod body in a penetrating way, exhaust holes are formed in the top end of the rod body in a penetrating way, the controller comprises a shell and a signal conversion circuit arranged in the shell, the rod body comprises an inner pipe and an outer pipe, the inner pipe is inserted into the outer pipe, the bottom end of the outer pipe is inserted with a lower plug, the shell is arranged at the top end of the outer pipe, at least two alarm devices are detachably connected at a cavity between the outer pipe and the inner pipe, and the alarm devices are electrically connected with the signal conversion circuit. The utility model can adjust the position of the alarm device in the capacitive liquid level switch according to the depth of the inner cavity of the container and the height of the alarm liquid level required to be set, thereby enabling the capacitive liquid level switch to be suitable for short-range liquid level detection.

Description

Short-range capacitive liquid level switch

Technical Field

The utility model relates to the technical field of liquid level switches, in particular to a short-range capacitive liquid level switch.

Background

The liquid level switch, also called water level switch, liquid level sensor, just as the name implies, is the switch that controls the line break-make through the liquid level, is used for judging the liquid medium liquid level in the container. In order to detect the liquid level condition in a container, a capacitive liquid level switch is generally used, a detection part of the capacitive liquid level switch is inserted into liquid in the container, the liquid between positive and negative plates is generally detected to obtain liquid level change, and the capacitive liquid level switch is generally provided with two liquid level alarms, and an alarm signal is generated when the liquid level is too high or too low, so that a worker is reminded. For example, patent publication No. CN 205262548U discloses a liquid level monitoring voltage signal sensor, which comprises a capacitive oil sensor formed by two outer tubes and inner tube connecting flanges which are coaxially assembled, and a signal conversion circuit which receives and converts capacitance signals transmitted from the capacitive oil sensor and the dielectric constant sensor into voltage signals and outputs the voltage signals is assembled in a cavity at the top end of the capacitive oil sensor.

However, the alarm liquid level in the conventional capacitive liquid level switch is usually a fixed liquid level, and when the liquid level of a container with a short cavity depth is measured, the capacitive liquid level switch is difficult to adjust according to the cavity depth of the container and different alarm liquid level heights required to be set, so that the capacitive liquid level switch has poor applicability to short-range liquid level detection.

Disclosure of Invention

The utility model aims to solve the defects of the technology, and designs the short-range capacitive liquid level switch, which can adjust the position of an alarm device in the capacitive liquid level switch according to the depth of an inner cavity of a container and the alarm liquid level height required to be set, so that the capacitive liquid level switch is suitable for short-range liquid level detection.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the utility model provides a short-range capacitive liquid level switch, includes body of rod and controller, the bottom of body of rod all has link up the feed liquor hole, the top of body of rod all has link up the exhaust hole, the controller includes the casing and sets up the signal conversion circuit in the casing, the body of rod includes inner tube and outer tube, the inner tube is inserted and is located in the outer tube, the bottom of outer tube is pegged graft and is had the end cap down, the casing set up in the top of outer tube, the outer tube with cavity department dismantlement formula between the inner tube is connected with two at least alarm device, alarm device with signal conversion circuit electric connection.

Preferably, the rod body further comprises an outer protection tube, the outer protection tube is sleeved on the inner tube, the alarm device comprises a magnetic induction switch and a magnetic floating ring, the magnetic induction switch is of an annular structure and sleeved on the outer protection tube, and the magnetic floating ring is movably connected to a cavity between the outer tube and the outer protection tube.

Preferably, the outer wall of the outer protection tube is uniformly provided with a plurality of travel ring grooves along the height direction of the inner tube, and the magnetic induction switch is detachably connected in the travel ring grooves, so that the peripheral side wall of the magnetic induction switch is attached to the outer wall of the outer protection tube.

Preferably, a sealing part is formed at the bottom end of the outer protection tube, the bottom end of the inner tube inserted into the outer protection tube is abutted against the sealing part, and a slot for plugging the sealing part is formed in the lower plug.

Preferably, a connecting ring is formed at the bottom of the shell, a limiting ring is arranged on the outer wall of the connecting ring, the limiting ring is inserted into a cavity between the outer protection pipe and the outer pipe and is in contact with the cavity and the cavity, and the inner wall of the limiting ring is in threaded connection with the inner pipe.

Preferably, the internal diameter of the connecting ring is larger than the internal diameter of the limiting ring, an auxiliary component with an annular structure is arranged on the inner wall of the connecting ring, and the auxiliary component comprises a compression wire, a tetrafluoro pad and an O-shaped ring which are sequentially sleeved on the outer protective tube.

Compared with the prior art, the utility model has the beneficial effects that: before the capacitive liquid level switch is used, the shell and the lower plug are detached from the rod body respectively, so that the inner tube and the alarm device are taken out from the outer tube, the installation position on the inner tube of the alarm device is adjusted according to the depth of the inner cavity of the container to be detected and the height of the alarm liquid level required to be set, the alarm liquid level of the capacitive liquid level switch is set, after the alarm device is installed, the inner tube and the alarm device can be inserted into the outer tube, and the shell and the lower plug are installed on the slave rod body, so that the capacitive liquid level switch is suitable for detecting the liquid level in a short range.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

fig. 2 is a cross-sectional view of an embodiment.

In the figure: 1. a cable interface; 2. a rod body; 21. an inner tube; 22. an outer protective tube; 23. an outer tube; 3. a housing; 4. a signal conversion circuit; 5. a liquid inlet hole; 6. an exhaust hole; 7. a lower plug; 8. an alarm device; 81. a magnetic induction switch; 82. a magnetic floating ring; 9. a stroke ring groove; 10. a closing part; 11. a slot; 12. a connecting ring; 13. a limiting ring; 14. compacting the wire; 15. a tetrafluoro pad; 16. an O-ring; 17. waterproof rubber cushion.

Detailed Description

The utility model is further described below by way of examples with reference to the accompanying drawings.

Referring to fig. 1 and 2, a short-range capacitive liquid level switch comprises a rod body 2 and a controller, wherein liquid inlet holes 5 are formed in the bottom end of the rod body 2, exhaust holes 6 are formed in the top end of the rod body 2, the rod body 2 comprises an inner pipe 21, an outer protection pipe 22 and an outer pipe 23, the outer protection pipe 22 is sleeved on the inner pipe 21, the liquid inlet holes 5 and the exhaust holes 6 are respectively formed in the inner pipe 21, the outer protection pipe 22 and the outer pipe 23, the inner pipe 21 and the outer protection pipe 22 are respectively inserted into the outer pipe 23, a sealing part 10 is formed at the bottom end of the outer protection pipe 22, the inner pipe 21 is inserted into the bottom end of the outer protection pipe 22 and is abutted against the sealing part 10, a lower plug 7 is inserted into the bottom end of the outer pipe 23, a slot 11 for inserting the sealing part 10 is formed in the lower plug 7, and the lower plug 7 is used for sealing a bottom end opening of the rod body 2.

The controller includes casing 3 and sets up the signal conversion circuit 4 in casing 3, casing 3 sets up in the top of outer tube 23, casing 3 one side is formed with cable interface 1, cavity department dismantlement formula between outer tube 23 and the inner tube 21 is connected with two at least alarm device 8, alarm device 8 and signal conversion circuit 4 electric connection, cable interface 1 supplies the wire to pass through, so that signal conversion circuit 4 respectively with body of rod 2 and alarm device 8 electric connection, waterproof cushion 17 in cable interface 1's the passageway, be used for avoiding the inside liquid of body of rod 2 to leak to the external world through cable interface 1, improve this capacitive liquid level switch's reliability.

The bottom of the shell 3 is provided with a connecting ring 12, the outer wall of the connecting ring 12 is provided with a limiting ring 13, the limiting ring 13 is inserted into a cavity between the outer protection pipe 22 and the outer pipe 23 and is in contact with the cavity, and the inner wall of the limiting ring 13 is in threaded connection with the inner pipe 21. The internal diameter of go-between 12 is greater than the internal diameter of spacing ring 13, and the inner wall of go-between 12 is provided with the auxiliary assembly that is annular structure, and auxiliary assembly is including pressing wire 14, tetrafluoro pad 15 and the O shape circle 16 that overlap in proper order on outer pillar 22, and auxiliary assembly is used for strengthening the seal reliability of being connected between casing 3 and the body of rod 2.

The alarm device 8 comprises a magnetic induction switch 81 and a magnetic floating ring 82, the magnetic induction switch 81 is of an annular structure and is sleeved on the outer protection tube 22, the magnetic floating ring 82 is movably connected to a cavity between the outer tube 23 and the outer protection tube 22, before the capacitive liquid level switch is used, the shell 3 and the lower plug 7 are respectively detached from the rod body 2 so as to take the inner tube 21 and the alarm device 8 out of the outer tube 23, so that the installation position on the inner tube 21 of the alarm device 8 can be adjusted according to the depth of the inner cavity of a container to be detected by the height of the alarm liquid level required to be set, the alarm liquid level of the capacitive liquid level switch is set, after the alarm device 8 is installed, the inner tube 21 and the alarm device 8 can be inserted into the outer tube 23, and the shell 3 and the lower plug 7 are installed on the slave rod body 2, so that the capacitive liquid level switch is suitable for short-range liquid level detection.

The outer wall of outer pillar 22 has evenly offered a plurality of stroke annular 9 along the direction of height of inner tube 21, and magnetic induction switch 81 dismantles to connect in stroke annular 9 to make the periphery lateral wall of magnetic induction switch 81 laminate with the outer wall of outer pillar 22, can realize the gear formula position adjustment of magnetic induction switch 81 on outer pillar 22 through a plurality of stroke annular 9.

When the rod body 2 measures the liquid level in the container, a coaxial capacitor is formed between the positive electrode of the inner tube 21 serving as a capacitor and the negative electrode of the outer tube 23 serving as a capacitor, liquid in the container flows into the cavity between the outer tube 23 and the outer protection tube 22 and the inner cavity of the inner tube 21 through the liquid inlet hole 5, and the exhaust hole 6 is used for maintaining the air pressure balance in the rod body 2 so as to ensure that the liquid level of the measured liquid among the inner cavity of the inner tube 21, the outer protection tube 22 and the outer tube 23 is always consistent with the liquid level of the measured liquid in the container.

When the liquid level of the measured medium in the container changes, the capacitance value between the inner tube 21 and the outer tube 23 will change, and the capacitive liquid level switch firstly transmits the capacitance signal through the internal signal conversion circuit 4 and converts the capacitance signal into a voltage signal for output, and the signal conversion circuit 4 is in the prior art and will not be described in detail herein.

The magnetic floating ring 82 is made of foam materials with magnetic powder, liquid flowing into the cavity between the outer tube 23 and the outer protection tube 22 drives the magnetic floating ring 82 to float upwards, and when the magnetic floating ring 82 floats upwards to the magnetic induction switch 81, the magnetic induction switch 81 induces the magnetic field of the magnetic floating ring 82 and triggers an alarm, so that the alarm function of the capacitive liquid level switch is realized.

Of course, the above is only a typical example of the utility model, and other embodiments of the utility model are also possible, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of the utility model claimed.

Claims (6)

1. The utility model provides a short-range capacitive liquid level switch, includes body of rod (2) and controller, liquid inlet (5) have all been link up to the bottom of body of rod (2), exhaust hole (6) have all been link up on the top of body of rod (2), and the controller includes casing (3) and sets up signal conversion circuit (4) in casing (3), body of rod (2) include inner tube (21) and outer tube (23), inner tube (21) are inserted and are located in outer tube (23), plug (7) have been pegged graft to the bottom of outer tube (23), casing (3) set up in the top of outer tube (23), characterized by: the cavity between the outer tube (23) and the inner tube (21) is detachably connected with at least two alarm devices (8), and the alarm devices (8) are electrically connected with the signal conversion circuit (4).

2. A short range capacitive fluid level switch as claimed in claim 1 wherein: the rod body (2) further comprises an outer protection tube (22), the outer protection tube (22) is sleeved on the inner tube (21), the alarm device (8) comprises a magnetic induction switch (81) and a magnetic floating ring (82), the magnetic induction switch (81) is of an annular structure and sleeved on the outer protection tube (22), and the magnetic floating ring (82) is movably connected to the cavity between the outer tube (23) and the outer protection tube (22).

3. A short range capacitive fluid level switch as claimed in claim 2 wherein: the outer wall of the outer protection tube (22) is uniformly provided with a plurality of travel ring grooves (9) along the height direction of the inner tube (21), and the magnetic induction switch (81) is detachably connected in the travel ring grooves (9), so that the outer peripheral side wall of the magnetic induction switch (81) is attached to the outer wall of the outer protection tube (22).

4. A short range capacitive fluid level switch as claimed in claim 2 wherein: the bottom of outer pillar (22) is formed with sealing portion (10), inner tube (21) insert bottom in outer pillar (22) with sealing portion (10) are inconsistent, lower end cap (7) are offered confession sealing portion (10) grafting slot (11).

5. A short range capacitive fluid level switch as claimed in claim 2 wherein: the bottom of casing (3) is formed with go-between (12), the outer wall of go-between (12) is provided with spacing ring (13), spacing ring (13) peg graft in outer pillar (22) with cavity department between outer tube (23) is inconsistent with the two, the inner wall of spacing ring (13) with inner tube (21) threaded connection.

6. A short range capacitive fluid level switch as defined in claim 5, wherein: the inner diameter of the connecting ring (12) is larger than that of the limiting ring (13), an auxiliary component with an annular structure is arranged on the inner wall of the connecting ring (12), and the auxiliary component comprises a compression wire (14), a tetrafluoro pad (15) and an O-shaped ring (16) which are sequentially sleeved on the outer protection tube (22).

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