CN214040222U - Moisture-blocking module for liquid level sensor - Google Patents

Abstract

The utility model discloses a damp-proof module for level sensor belongs to sensor technical field. The damp blocking module for the liquid level sensor comprises a cable and an air guide pipe penetrating through the cable, the damp blocking module comprises a connecting plug, an air bag and a shell assembly, the connecting plug is sleeved on the cable, and the air guide pipe penetrates through the connecting plug; the air bag is covered on the connecting plug and is communicated with the air duct; the shell component presses the air bag on the connecting plug so that the air bag is connected with the connecting plug in a sealing mode. The utility model discloses a hinder damp module for level sensor through the cooperation of connecting stopper, gasbag and shell subassembly, can make the inside atmospheric pressure of level sensor and external balance, can prevent external steam to pass through the air duct again and get into inside to reach and to guarantee measurement accuracy, can solve the bad effect that produces because of the condensation again, the field maintenance expense of avoiding consequently bringing has improved level sensor's reliability, has avoided extravagant and overlapping investment, the cost is reduced.

Description

Moisture-blocking module for liquid level sensor

Technical Field

The utility model relates to a sensor technical field especially relates to a hinder damp module for level sensor.

Background

Input formula level sensor in the existing market, in order to guarantee measurement accuracy, generally use gauge pressure type sensor, its back has the air duct, ensure with the atmosphere intercommunication, nevertheless be heated or receive cold because of sensor and cable, increase or reduce along with pressure, and lead to the inside volume increase of cable air duct or reduce, produce the comdenstion water and can enter into inside the sensor through the air duct, damage the inside components and parts of sensor, lead to needing periodic field maintenance, cause the sensor to damage even. In the prior art, a polymer plug is arranged at the end head of an air duct, so that gas in the air duct can be discharged quickly through the polymer plug, the internal and external air pressures are balanced, and the service life can be prolonged. However, the polymer plug can prevent large water drops (with a particle size of more than 0.02 μm) from entering the air duct, but cannot prevent water vapor (with a particle size of less than 0.004 μm) from entering the air duct from the outside in a humid environment, which can cause damage to the sensor and other components.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hinder damp module for level sensor can make the inside atmospheric pressure of sensor and external balance can prevent external steam again and admit air inside module to reach and to guarantee measurement accuracy, the protection effect of solution condensation influence that again can be thoroughly permanent, the field maintenance expense of avoiding consequently bringing improves the reliability, avoids extravagant and overlapping investment.

To achieve the purpose, the utility model adopts the following technical proposal:

a damp module for level sensor, level sensor includes the cable and wears to establish air duct in the cable, damp module includes:

the connecting plug is sleeved on the cable, and the air guide pipe penetrates through the connecting plug;

the air bag is covered on the connecting plug and is communicated with the air duct;

and the shell assembly presses the air bag on the connecting plug so as to enable the air bag to be connected with the connecting plug in a sealing mode.

Optionally, the moisture barrier module further comprises a seal disposed between the bladder and the housing assembly.

Optionally, a through hole is formed in the connecting plug, the cable and the air duct penetrate through the through hole, the longitudinal section of the connecting plug is in a shape of a T, the connecting plug comprises a first connecting portion and a second connecting portion connected with the first connecting portion, the outer diameter of the second connecting portion is larger than that of the first connecting portion, and the second connecting portion is wrapped in the air bag.

Optionally, the housing assembly includes a housing, one end of the housing is connected to the connecting plug, an annular step is circumferentially disposed inside one end of the housing connected to the connecting plug, the housing is sleeved on the connecting plug, an inner circumferential surface of the annular step abuts against the air bag on the first connecting portion, and/or an end surface of the annular step abuts against the air bag on the second connecting portion.

Optionally, a signal line is further arranged in the cable in a penetrating manner, a first mounting hole is formed in the shell, the signal line is arranged in the first mounting hole in a penetrating manner, and the signal line and the airbag are arranged in a separated manner through the first mounting hole.

Optionally, the housing assembly further includes a cover connected to the housing, the housing and the cover form an accommodation space, the airbag is disposed in the accommodation space, the cover is provided with a second mounting hole corresponding to the first mounting hole, a gap is axially disposed between the cover and the housing, and the accommodation space is communicated with the outside atmosphere through the gap and the second mounting hole.

Optionally, the first connecting portion has an opening formed in an axial direction, and the signal line extends from the opening.

Optionally, the damp blocking module further includes a fixing joint, the fixing joint is sleeved on the cable, and the fixing joint presses the connecting plug against the cable, so that the cable is hermetically connected with the connecting plug.

Optionally, a desiccant is disposed within the bladder.

Optionally, the air bag is a polymer waterproof air bag, and the connecting plug is a polymer waterproof plug.

The utility model has the advantages that:

the utility model provides a damp-blocking module for a liquid level sensor.A connecting plug sleeve is arranged on a cable and an air duct, and an air bag has elastic energy to be coated on the connecting plug, so that the air bag and the connecting plug sleeve are arranged at one end of the air duct, and the air duct is communicated with the air bag; because of the temperature rising in the air duct, the gasbag volume increase is until balanced with atmospheric pressure to guarantee that the inside and outside atmospheric pressure of air duct is balanced, and on the same way, when the temperature reduces, the gasbag volume reduces until balanced with atmospheric pressure, thereby guarantees that the inside and outside atmospheric pressure of air duct is balanced.

The air bag is hermetically connected with the connecting plug, so that external water vapor is prevented from entering the air duct through a connecting gap between the air bag and the connecting plug, the effect of protecting the liquid level sensor and related components is achieved, and the service life of the equipment is prolonged; because the gasbag has elasticity, be difficult to guarantee when gasbag and connecting plug are connected reliably, also be difficult to guarantee sealing connection, compress tightly the gasbag on the connecting plug through shell subassembly, simple structure is compact, connects reliably, and the dismouting of being convenient for. The moisture blocking module can balance the air pressure inside the liquid level sensor with the outside and prevent outside water vapor from entering the inside through the air guide tube, so that the measuring precision can be guaranteed, the bad effect caused by condensation can be solved, the field maintenance cost caused by the bad effect is avoided, the reliability of the liquid level sensor is improved, the waste and the repeated investment are avoided, and the cost is reduced.

Drawings

FIG. 1 is a schematic structural view of a moisture blocking module for a liquid level sensor according to an embodiment of the present invention;

FIG. 2 is an exploded view of a moisture barrier module for a level sensor provided in accordance with an embodiment of the present invention;

FIG. 3 is a front view of a moisture blocking module for a level sensor according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

fig. 5 is a schematic structural diagram of a housing according to an embodiment of the present invention.

In the figure:

100-a cable; 200-an airway tube; 300-signal lines;

1-a connecting plug; 11-a first connection; 111-opening; 112-a seal groove; 12-a second connection; 121-avoidance slots; 13-a through hole;

2-air bag;

3-a housing component; 31-a cover body; 311-second mounting hole; 32-a housing; 321-an annular step; 322-a first mounting hole; 33-clearance;

4-fixing the joint;

5-sealing element.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The liquid level sensor comprises a sensor body, a cable 100 connected to the sensor body and an air duct 200 penetrating the cable 100, wherein the air duct 200 is used for discharging internal gas, balancing internal and external air pressure and prolonging the service life; in order to avoid the moisture environment from affecting the use of the liquid level sensor due to the vapor entering the air duct 200, the embodiment provides a moisture-blocking module for the liquid level sensor, and the moisture-blocking module is arranged at one end of the air duct 200, which is opposite to the sensor body. As shown in fig. 1-4, the moisture-blocking module includes a connecting plug 1, an airbag 2, and a housing assembly 3; specifically, the connecting plug 1 is sleeved on the cable 100, and the air duct 200 is arranged through the connecting plug 1; the air bag 2 is covered on the connecting plug 1 and is communicated with the air duct 200; the housing component 3 presses the airbag 2 against the connecting plug 1, so that the airbag 2 is sealingly connected to the connecting plug 1.

The connecting plug 1 is sleeved on the cable 100 and the air duct 200, and the air bag 2 has elastic energy to cover the connecting plug 1, so that the air bag 2 and the connecting plug 1 cover one end of the air duct 200, and the air duct 200 is communicated with the air bag 2; according to the formula PV-nRT, when the temperature in the airway tube 200 rises, the volume of the air bag 2 increases until the air pressure is balanced with the atmospheric pressure, so that the balance of the air pressure in the airway tube 200 and the balance of the air pressure outside the airway tube 200 can be ensured, and similarly, when the temperature falls, the volume of the air bag 2 decreases until the air pressure is balanced with the atmospheric pressure, so that the balance of the air pressure in the airway tube 200 and the air pressure outside the airway tube can be ensured. Gasbag 2 with connect 1 sealing connection of stopper, prevent that outside steam from passing through gasbag 2 and connecting the inside joint clearance air duct 200 between the stopper 1 to reach the effect of protection level sensor and relevant components and parts, improved equipment life. Because gasbag 2 has elasticity, be difficult to guarantee when gasbag 2 is connected with connecting plug 1 to connect reliably, also be difficult to guarantee sealing connection, compress tightly gasbag 2 on connecting plug 1 through shell subassembly 3, simple structure is compact, connects reliably, and the dismouting of being convenient for. The damp-blocking module can balance the air pressure inside the liquid level sensor with the outside and prevent outside water vapor from entering the inside through the air guide pipe 200, so that the measuring precision can be guaranteed, the bad effect caused by condensation can be solved, the field maintenance cost caused by the bad effect is avoided, the reliability of the liquid level sensor is improved, the waste and the repeated investment are avoided, and the cost is reduced.

Optionally, the moisture barrier module further comprises a seal 5, the seal 5 being disposed between the bladder 2 and the housing assembly 3. The housing component 3 presses the airbag 2 against the connecting plug 1 via the seal 5, which further improves the seal between the airbag 2 and the connecting plug 1. In this embodiment, the sealing element is a sealing ring, at least one sealing groove 112 is formed in the connecting plug 1, and the housing assembly 3 compresses the airbag on the sealing groove 112 through the sealing ring to realize sealing. The sealing element 5 also prevents direct contact between the airbag 2 and the housing assembly 3, avoiding damage to the airbag 2 and increasing the service life of the airbag 2. When the air bag is installed, the sealing ring is sleeved on the air bag 2 and part of the connecting plug 1, the shell component 3 compresses the sealing ring and is connected with the connecting plug 1, in order to verify the tightness between the air bag 2 and the connecting plug 1, the judgment can be carried out through the contact between the shell component 3 and the sealing ring, and when the shell component 3 and the air bag 2 are not sealed, the sealing ring does not compress the air bag 2 and the connecting plug 1, namely the air bag 2 and the connecting plug 1 are not connected in a sealing manner; on the contrary, when the housing component 3, the sealing ring and the airbag 2 are connected in a sealing manner, the airbag 2 and the connecting plug 1 are connected in a sealing manner.

Because the high molecular material can prevent large water drops with the particle size of more than 0.02 mu m, optionally, the air bag 2 is a high molecular waterproof air bag, so as to further prevent external water vapor from entering the air duct 200 through the air bag 2; the specific air bag 2 can be a high-polymer rubber air bag with high elasticity; in the same way, the connecting plug 1 is a polymer waterproof plug, and the specific connecting plug 1 can be a polymer rubber plug. Optionally, a drying agent is arranged in the air bag 2 and can absorb the original moisture in the air duct 200, so that the effect of further protecting the liquid level sensor and related components is achieved.

Optionally, with continued reference to fig. 1-4, the fixing connector 4 is sleeved on the cable 100, and presses the connecting plug 1 against the cable 100, so that the connecting plug 1 and the cable 100 are fixed together, and the moisture blocking module is fixed on the cable 100 and connected to the liquid level sensor, which is convenient and reliable to use; meanwhile, the connecting plug 1 is pressed against the cable 100, so that the cable 100 is hermetically connected with the connecting plug 1, external water vapor can be prevented from entering the water vapor through a gap between the connecting plug 1 and the cable 100, and the sealing property is improved. The fixed joint 4 can adopt a standard component in the prior art, the specific structure is not described in detail, and when the fixed joint 4 is used, the whole fixed joint 4 is firstly sleeved on the cable 100 and the connecting plug 1, and then the nut on the fixed joint 4 is screwed, so that the connecting plug 1 is pressed on the cable 100.

As shown in fig. 2, optionally, a through hole 13 is formed in the connecting plug 1, the cable 100 and the airway tube 200 are inserted into the through hole 13, the longitudinal section of the connecting plug 1 is T-shaped, and the connecting plug includes a first connecting portion 11 and a second connecting portion 12 connected to the first connecting portion 11, the outer diameter of the second connecting portion 12 is larger than the outer diameter of the first connecting portion 11, the second connecting portion 12 is wrapped in the airbag 2, and the second connecting portion 12 can support the elastic airbag 2, so that the connection reliability and the sealing performance between the connecting plug 1 and the airbag 2 are improved.

Optionally, the housing assembly 3 includes a housing 32, one end of the housing 32 is connected to the connecting plug 1, specifically, an internal thread may be provided on the housing 32, an external thread is provided on the first connecting portion 11 of the connecting plug 1, and the housing 32 and the first connecting portion 11 are connected by thread fit; or the shell 32 and the first connecting part 11 of the connecting plug 1 are both provided with connecting holes, and the fastening piece passes through the two connecting holes to realize the detachable connection of the shell 32 and the connecting plug 1; alternatively, the housing 32 and the connecting plug 1 are connected by bonding, welding, or the like, but not limited thereto.

In this embodiment, as shown in fig. 5, an annular step 321 is circumferentially disposed inside one end of the housing 32 connected to the connecting plug 1, the housing 32 is sleeved on the connecting plug 1, an inner circumferential surface of the annular step 321 presses the airbag 2 against the first connecting portion 11, so that the airbag 2 is hermetically connected to the first connecting portion 11, an end surface of the annular step 321 presses the airbag 2 against the second connecting portion 12, so that the airbag 2 is hermetically connected to the second connecting portion 12, and thus the reliability of the sealing connection between the airbag 2 and the connecting plug 1 is improved.

Optionally, referring to fig. 5, a signal line 300 is further inserted into the cable 100, a first mounting hole 322 is formed in the housing 32, the signal line 300 is inserted into the first mounting hole 322, and the signal line 300 and the airbag 2 are separated from each other through the first mounting hole 322 to prevent mutual interference between the structures. Optionally, a protruding portion is convexly disposed on an inner wall of the housing 32, the first mounting hole 322 is disposed on the protruding portion, and when the housing 32 is sleeved on the connecting plug 1, in order to prevent interference between the connecting plug 1 and the housing 32, an avoiding groove 121 for avoiding the protruding portion is disposed on the second connecting portion 12. In this embodiment, the shell 32 is connected with the connecting plug 1 in an interference fit manner, so that the shell 32 and the connecting plug 1 are prevented from rotating relatively to influence the fit between the avoiding groove 121 and the protruding part, and the installation is convenient; the airbag 2 has elasticity and can be elastically deformed according to the shape of the convex portion, thereby avoiding interference.

Optionally, the housing assembly 3 further comprises a cover 31 connected with the housing 32, the housing 32 and the cover 31 forming an accommodating space, the airbag 2 being disposed in the accommodating space for protecting the airbag 2; a second mounting hole 311 corresponding to the first mounting hole 322 is formed in the cover 31, so that the signal line passes through the first mounting hole 322 and the second mounting hole 311; specifically, as shown in fig. 4, a gap 33 is provided in the axial direction between the cover 31 and the housing, and the accommodation space communicates with the outside atmosphere after passing through the gap 33 and the second mounting hole 311, so that the airbag 2 is in contact with the outside atmosphere, and the adjustment of the balance of the airbag 2 with the atmospheric pressure is facilitated.

Optionally, the housing 32 and the cover 31 are detachably connected or connected in other manners by a threaded connection or the like, optionally, the housing 32 is connected with the cover 31 in an interference fit manner, so that the first mounting hole 322 and the second mounting hole 311 are communicated and mounted, in this embodiment, an inner ring of the cover 31 is in an interference fit manner with an outer ring of the housing 32, and a height of the inner ring of the cover 31 is greater than a height of the outer ring of the housing 32, so that a gap 33 occurs in an axial direction when the housing 32 is connected with the cover 31, and in other embodiments, the outer ring of the cover 31 may be in an interference fit with the inner ring of the housing 32. The housing 32 and the connecting plug 1 are connected by a detachable connection or other connection means, and the housing assembly 3 and the connecting plug 1 may also be made as an integral structure, without limitation.

Optionally, the first connecting portion 11 has an opening 111 formed in the axial direction, the signal line 300 extends from the opening 111, and the opening 111 facilitates the connection plug 1 to be sleeved on the cable 100 for installation.

In this embodiment, the connecting plug 1, the housing 32 and the cover plate are all revolving bodies, and are all installed along the cable 100, so as to avoid the cable 100 from bending.

Because the plastic material has advantages such as anticorrosive, anti-aging and resistant high low temperature, in this embodiment, casing 32 and lid 31 are plastic casing 32 and plastic lid 31 respectively, and the reliability is high, can increase of service life, has advantages such as good reliability when splendid attire gasbag 2.

Further optionally, the installation process step of the moisture-proof module comprises:

s1: the drying agent is placed in the air bag 2, and the air bag 2 is coated on the connecting plug 1;

s2: the sealing ring is sleeved on the first connecting part 11 and arranged in the sealing groove 112;

s3: the air bag 2 and the connecting plug 1 are arranged on the shell 32, and the shell 32 presses the air bag 2 on the connecting plug 1 through a sealing ring, so that the air bag 2 and the connecting plug 1 are connected in a sealing manner;

s4: the cable 100 is arranged in the connecting plug 1 in a penetrating way, and the air duct 200 is inserted into the connecting plug 1 and communicated with the air bag 2;

s5: the fixed joint 4 is sleeved on the cable 100;

s6: the signal line 300 extends from the opening 111 of the connecting plug 1 and passes through the first mounting hole 322 and the second mounting hole 311 of the case 32 and the cover 31 in this order;

s7: the fixed joint 4 is locked on the connecting plug 1, so that the cable 100 and the connecting plug 1 are simultaneously locked to form a firm whole;

s8: the cover 31 is attached to the case 32. The attachment of the structure of the airbag 2 and the like can be adjusted before the cover 31 is connected to the case 32.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A damp blocking module for a liquid level sensor, the liquid level sensor comprising a cable (100) and an airway (200) passing through the cable (100), characterized in that the damp blocking module comprises:

the connecting plug (1) is sleeved on the cable (100), and the air duct (200) penetrates through the connecting plug (1);

the air bag (2) is coated on the connecting plug (1) and is communicated with the air duct (200);

the shell component (3) presses the air bag (2) on the connecting plug (1) so as to enable the air bag (2) to be connected with the connecting plug (1) in a sealing mode.

2. The moisture blocking module for a liquid level sensor according to claim 1, further comprising a seal (5), the seal (5) being arranged between the gas bag (2) and the housing assembly (3).

3. The moisture blocking module for the liquid level sensor according to claim 1, wherein a through hole (13) is formed in the connecting plug (1), the cable (100) and the air duct (200) penetrate through the through hole (13), the connecting plug (1) is T-shaped in longitudinal section and comprises a first connecting portion (11) and a second connecting portion (12) connected with the first connecting portion (11), the outer diameter of the second connecting portion (12) is larger than that of the first connecting portion (11), and the second connecting portion (12) is wrapped in the air bag (2).

4. The moisture blocking module for the liquid level sensor according to claim 3, wherein the housing assembly (3) comprises a housing (32), one end of the housing (32) is connected with the connecting plug (1), an annular step (321) is circumferentially arranged inside one end of the housing (32) connected with the connecting plug (1), the housing (32) is sleeved on the connecting plug (1), the inner circumferential surface of the annular step (321) presses the air bag (2) on the first connecting portion (11), and/or the end surface of the annular step (321) presses the air bag (2) on the second connecting portion (12).

5. The moisture-proof module for the liquid level sensor according to claim 4, wherein a signal line (300) is further arranged in the cable (100) in a penetrating manner, a first mounting hole (322) is formed in the housing (32), the signal line (300) is arranged in the first mounting hole (322) in a penetrating manner, and the signal line (300) and the air bag (2) are arranged in a separated manner through the first mounting hole (322).

6. The moisture blocking module for the liquid level sensor according to claim 5, wherein the housing assembly (3) further comprises a cover body (31) connected with the housing (32), the housing (32) and the cover body (31) form a receiving space, the airbag (2) is disposed in the receiving space, a second mounting hole (311) corresponding to the first mounting hole (322) is opened on the cover body (31), a gap (33) is disposed in an axial direction between the cover body (31) and the housing (32), and the receiving space is communicated with the external atmosphere through the gap (33) and the second mounting hole (311).

7. Moisture-proof module for a liquid level sensor according to claim 5, characterized in that the first connection portion (11) is axially provided with an opening (111), and the signal line (300) extends from the opening (111).

8. The moisture blocking module for a liquid level sensor according to any one of claims 1 to 7, further comprising a fixing joint (4), wherein the fixing joint (4) is sleeved on the cable (100), and the fixing joint (4) presses the connecting plug (1) against the cable (100) so as to enable the cable (100) to be connected with the connecting plug (1) in a sealing manner.

9. Moisture-blocking module for a liquid level sensor according to any one of claims 1 to 7, characterized in that a desiccant is provided in the gas bag (2).

10. The moisture blocking module for a liquid level sensor according to any one of claims 1 to 7, wherein the balloon (2) is a polymer waterproof balloon and the connecting plug (1) is a polymer waterproof plug.

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