CN104006864B - A kind of electrode pulling device of the capacitive liquid level sensor for high pressure storage tank - Google Patents

Abstract

The invention discloses an electrode lead-out device for a capacitive liquid level sensor of a high-pressure storage tank, which comprises a first lead-out tube made of conductive metal, one end of the first lead-out tube is connected to the inside of the high-pressure storage tank body connected to allow the first electrode to enter the first lead-out tube from this end and pass through the other end, and the first lead-out tube is electrically connected to the tank electrically connected to the second electrode of the probe, and the first lead-out tube is electrically connected to the second electrode of the probe There is an insulating sealing body between the inner wall of the first drawing pipe and the first electrode, and the insulating sealing body is poured between the inner wall of the first drawing pipe and the first electrode and is connected to the first drawing pipe. The inner wall and the first electrode are integrated into one body. The technical problem to be solved by the present invention is to overcome the shortcoming of the existing high-pressure storage tank electrode lead-out device that the seal is easy to fail under the action of high pressure, and to provide a capacitive liquid level for high-pressure storage tanks with higher sealing performance and more reliable sealing. The electrode lead-out device of the sensor.

Description

An electrode lead-out device for a capacitive liquid level sensor used in a high-pressure storage tank

technical field

The invention relates to the field of liquid level measurement. Specifically, it is an electrode lead-out device for a capacitive liquid level sensor of a high-pressure storage tank.

Background technique

Liquid sensor is an essential instrument to realize liquid level control, and the application of capacitive liquid level sensor is very common. At present, there are two types of capacitive liquid sensors: integral type and split type. The integral capacitive sensor is immersed in the liquid, in order to protect its internal circuit components, the requirements for sealing performance are very high. The split capacitive liquid level sensor is divided into a probe inside the tank and a circuit part outside the tank. The signal of the probe is transmitted to the circuit part outside the tank through the electrode terminal or lead wire passing through the tank. Sealing rings or other sealing materials are used to seal between the lead end of the electrode or the lead wire and the tank body. However, when this electrode extraction device is applied to a high-pressure storage tank, since the hydraulic pressure in the high-pressure storage tank is very high, the sealing ring or sealing material will be deformed under long-term high pressure, resulting in seal failure, and the liquid is prone to leakage.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the shortcoming of the existing high-pressure storage tank electrode lead-out device that the seal is easy to fail under the action of high pressure, and to provide a capacitive liquid level for high-pressure storage tanks with higher sealing performance and more reliable sealing. The electrode lead-out device of the sensor.

The electrode lead-out device for the capacitive liquid level sensor of the high-pressure storage tank of the present invention includes a first lead-out tube made of conductive metal, and one end of the first lead-out tube communicates with the interior of the high-pressure storage tank body to allow The first electrode of the probe arranged in the tank enters the first lead-out tube from this end and passes out from the other end of the first lead-out tube, and the first lead-out tube and the first lead-out tube of the probe The tank body that the two electrodes are electrically connected to is electrically connected, and there is an insulating sealing body between the inner wall of the first lead-out pipe and the first electrode, and the insulating sealing body is cast on the inner wall of the first lead-out pipe and the first electrode. One electrode is integrated with the inner wall of the first lead-out tube and the first electrode.

Preferably, the inner diameter of the part where the first outlet pipe is combined with the insulating sealing body near the tank body is larger than the inner diameter of the other end.

Preferably, the inner wall of the part where the first outlet pipe is combined with the insulating sealing body has a stepped surface facing the high-pressure storage tank.

Preferably, the stepped surface surrounds the inner wall of the first outlet pipe for a week.

Preferably, the electrode lead-out device further includes a second lead-out tube that communicates with the interior of the tank and is sealed at one end with the tank, and a locking device for connecting the first lead-out tube and the second lead-out tube. threaded locking nut, the second lead-out tube is made of conductive metal and is electrically connected to the tank body, the other end of the second lead-out tube and the end of the first lead-out tube close to the tank body are both It has a first outer locking thread that cooperates with the inner locking thread of the locking nut, and the end of the first outlet pipe connected to the locking nut has a tapered first sealing surface, and the second outlet pipe One end connected with the lock nut has a conical or spherical second sealing surface. When the first outlet pipe and the second outlet pipe are installed in place, the first sealing surface and the second sealing surface cooperate to form a surface seal.

Preferably, the end of the first outlet pipe away from the tank body has a second external locking thread for connecting with a low-pressure pipeline, and the end of the first outlet pipe is provided with a A gasket that acts as a seal between the outlet pipe and the low-pressure pipe.

Compared with the prior art, the electrode lead-out device for the capacitive liquid level sensor of the high-pressure storage tank of the present invention has the following beneficial effects:

1. In the present invention, the lead-out of the two electrodes of the probe is realized through the tube wall and inside of the first lead-out tube, and an insulating sealing body is poured between the inner wall of the first lead-out tube and the first electrode, and the insulator and the first lead-out tube The inner wall of the first electrode is integrated into one body. Compared with the prior art, the air-tight performance and the stability of the seal can be greatly improved, and the life of the seal can be prolonged.

2. The inner diameter of the part where the first lead-out pipe is combined with the insulating sealing body is larger than the inner diameter of the other end near the tank. In this way, the insulator will be more closely combined with the inner wall of the first outlet pipe and the electrode under the action of the high-pressure liquid, thereby further improving the sealing performance and sealing stability.

3. The inner wall of the part where the first lead-out pipe is combined with the insulating sealing body has a stepped surface facing the high-pressure storage tank. That is, the inner wall of the first lead-out pipe is provided with a step, and under the effect of high pressure, the combination between the insulating sealing body and the step surface facing the tank is tighter.

4. The present invention is also provided with a second outlet pipe. The first outlet pipe has a first tapered sealing surface, and the second outlet pipe has a second tapered sealing surface. When the first outlet pipe and the second outlet pipe are installed in place, The first tapered sealing surface cooperates with the second tapered sealing surface to form a face seal. The sealing performance in the direction perpendicular to the axial direction between the first outlet pipe and the second outlet pipe can be improved.

Description of drawings

Fig. 1 is a cross-sectional view of an electrode lead-out device for a capacitive liquid level sensor for a high-pressure storage tank according to an embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view of a first lead-out pipe of an electrode lead-out device for a capacitive liquid level sensor for a high-pressure storage tank according to an embodiment of the present invention.

reference sign

1-First lead-out tube, 2-First electrode, 3-Insulation sealing body, 4-Step, 5-Step surface, 6-First external locking thread, 7-Second external locking thread, 8-Sealing gasket , 9-first sealing surface, 10-second outlet pipe, 11-second sealing surface, 12-lock nut, 13-annular step, 14-tank.

detailed description

FIG. 1 is a schematic structural view of an electrode lead-out device for a capacitive liquid level sensor used in a high-pressure storage tank according to the present invention. The probe of the capacitive liquid level sensor is located in the tank body 14, and the tank body 14 itself is made of conductive metal. The first electrode 2 of the probe is led out through the wall of the tank body 14 , and the second electrode (not shown in the figure) is electrically connected with the tank body 14 and guided through the tank body 14 .

Fig. 2 is an enlarged cross-sectional view of the first lead-out pipe of the electrode lead-out device of a capacitive liquid level sensor for a high-pressure storage tank according to an embodiment of the present invention. As shown in Fig. 1 and Fig. 2, the present invention is used for a high-pressure storage tank The electrode lead-out device of the capacitive liquid level sensor includes a first lead-out tube 1 made of conductive metal, and one end of the first lead-out tube 1 communicates with the inside of the high-pressure storage tank body 14 to allow it to be installed in the tank body The first electrode 2 of the probe inside 14 enters the first lead-out tube 1 from this end and passes out from the other end. At the same time, the first lead-out tube 1 is electrically connected to the tank body 14 electrically connected to the second electrode of the probe, and the electrical connection between the first lead-out tube 1 and the second electrode of the probe can be a direct connection, Indirect connections are also possible. Both the first electrode 2 and the second electrode of the probe are drawn out, and the first electrode 2 and the second electrode after being drawn out are connected with a liquid level transmitter and a display instrument (not shown in the figure), so as to realize monitoring of the liquid in the high-pressure storage tank. Liquid level monitoring.

In the present invention, there is an insulating sealing body 3 between the inner wall of the first lead-out pipe 1 and the first electrode 2, and the insulating sealing body 3 divides the inside of the first lead-out pipe 1 into a high-voltage side and a low-voltage side, as shown in the figure 2. The insulating sealing body 3 is cast between the inner wall of the first outlet pipe 1 and the first electrode 2 and integrated with the inner wall of the first outlet pipe 1 and the first electrode 2 . The material of the insulating sealing body 3 can be silicate insulating material or insulating material commonly used in the field. Through high temperature casting, the insulating sealing body 3 is integrated with the inner wall of the first lead-out pipe 1 to improve the bonding strength of the two. Compared with the prior art, the air-tight performance and the stability of the seal can be greatly improved, and the life of the seal can be prolonged.

Preferably, the inner diameter of the part where the first outlet pipe 1 is combined with the insulating sealing body 3 near the tank is larger than the inner diameter of the other end. In this way, the insulator will be more closely combined with the inner wall of the first lead-out pipe 1 and the electrodes under the action of the high-pressure liquid, thereby further improving the sealing performance and sealing stability. The change of the inner diameter of the first lead-out pipe 1 can be a gradual and continuous change, for example, the inner wall of the first lead-out pipe 1 can be tapered, or can take other forms.

In this embodiment, the inner wall of the part where the first lead-out pipe 1 is combined with the insulating sealing body 3 has a stepped surface 5 facing the high-pressure storage tank. That is, the inner wall of the first lead-out pipe 1 is provided with a step 4 , and under the effect of high pressure, the combination between the insulating sealing body 3 and the step surface 5 facing the tank body 14 is tighter. Preferably, the stepped surface 5 surrounds the inner wall of the first outlet pipe 1 for a circle, so that the sealing is more stable. Of course, multiple steps may also be provided around the inner wall of the first outlet pipe 1 .

Preferably, the electrode lead-out device also includes a second lead-out tube 10 that communicates with the inside of the tank body 14 and is sealed at one end with the tank body 14, and is used to connect the first lead-out tube 1 and the second lead-out tube. 10 lock nut 12 with locking thread. In this embodiment, one end of the first outlet pipe 1 connected to the second outlet pipe 10 has a tapered first sealing surface 9, and the second outlet pipe 10 is connected to the first outlet pipe 1 One end has a conical or spherical second sealing surface 11. When the first outlet pipe 1 and the second outlet pipe 10 are installed in place, the first sealing surface 9 and the second sealing surface 11 are pressed together to form a tapered surface seal. The sealing performance in the direction perpendicular to the axial direction between the first outlet pipe 1 and the second outlet pipe 10 can be improved.

The connection between the first lead-out pipe 1 and the second lead-out pipe 10 is specifically that the end of the first lead-out pipe 1 close to the tank body 14 has a first external locking thread 6, and the second lead-out pipe 10 has an annular Step 13, the lock nut 12 is sleeved on the second lead-out pipe 10, the inner lock thread of the lock nut 12 is connected with the first outer lock thread 6 of the first lead-out pipe 1, when connected in place, the lock nut 12 The other end of the second lead-out pipe 10 against the annular step 13, at the same time, the second sealing surface 11 and the first sealing surface 9 squeeze each other to form a tapered sealing surface, so that the first connecting pipe 1 and the second The connecting pipes 10 are hermetically connected together. The shape of the second lead-out pipe 10 is not limited, it may be a straight pipe or a curved pipe. The second lead-out pipe 10 is made of conductive metal and electrically connected with the tank body 14 and the first lead-out pipe 1 , and the locking nut 12 is also preferably made of conductive metal.

Preferably, the end of the first outlet pipe 1 away from the tank body 14 has a second external locking thread 7 for connecting with a low-pressure pipeline (not shown in the figure), and the first outlet pipe 1 This end is provided with a gasket 8 for sealing between the first outlet pipe 1 and the low-pressure pipeline, and the gasket 8 may be a rubber gasket. Thereby, a sealed connection of the electrode lead-out device on the low-voltage side and the electrical connection joint is realized.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications or equivalent replacements made to the present invention by those skilled in the art within the spirit and protection scope of the present invention also fall within the protection scope of the present invention.

Claims (4)

1. the electrode pulling device of a kind of capacitive liquid level sensor for high pressure storage tank, it is characterised in that：Including by conductive gold The first fairlead that category is made, described first fairlead one end mutually passes to the inside of the high pressure storage tank tank body and allows to be located at institute The first electrode of the probe in tank body is stated to be worn from the end into first fairlead and from the other end of first fairlead Go out, and first fairlead and electrically connected with the second electrode of the probe tank body electrical connection, first fairlead There is insulating seal, the insulating seal is cast in the inwall of first fairlead between inwall and the first electrode It is combined into one between the first electrode and with the inwall and first electrode of first fairlead, described first draws Internal diameter of the part that pipe is combined with the insulating seal near one end of the tank body is more than the internal diameter of the other end, the electrode Ejector also includes being communicated with the tank interior and the second fairlead that one end is tightly connected with the tank body and for even The locking nut with locking screw of first fairlead and the second fairlead is connect, second fairlead is by conducting metal It is made and is electrically connected with the tank body, the other end of second fairlead and first fairlead is near the one of the tank body End is respectively provided with the first outer locking screw thread coordinated with the internal locking screw thread of locking nut, and first fairlead and the locking One end of nut connection has the primary sealing area of taper, and one end that second fairlead is connected with the locking nut has Taper or spherical secondary sealing area, when the first fairlead and the second fairlead are installed in place, the primary sealing area and institute State secondary sealing area and cooperatively form face sealing.

2. the electrode pulling device of the capacitive liquid level sensor for high pressure storage tank according to claim 1, its feature exists In：First fairlead with the inwall of the part that the insulating seal is combined have towards the high pressure storage tank step Face.

3. the electrode pulling device of the capacitive liquid level sensor for high pressure storage tank according to claim 2, its feature exists In：The step surface draws inside pipe wall one week around described first.

4. the electrode pulling device of the capacitive liquid level sensor for high pressure storage tank according to claim 3, its feature exists In：First fairlead has the second outer locking screw thread for being connected with low pressure pipeline away from one end of the tank body, And the end of first fairlead is provided with the sealing gasket for being sealed between first fairlead and low pressure pipeline.