Explosion-proof electric contact water level gauge

Abstract

The utility model discloses an explosion-proof type electric contact water level gauge which comprises a measuring cylinder, electrode holders are arranged on the cylinder wall of the measuring cylinder at intervals in a staggered mode, electrodes in the measuring cylinder stretch out of the corresponding electrode holders in a sealed mode, the electrodes stretching out of the electrode holders are electrically connected with corresponding cables, and the explosion-proof type electric contact water level gauge further comprises a cylindrical explosion-proof cover. A cylindrical explosion-proof chamber is formed in the explosion-proof cover, one end of the explosion-proof cover is provided with a cable passing hole and a compression screw hole, the bottom of the compression screw hole is provided with a sealing washer, a compression bolt is screwed in the compression screw hole, and a bolt passing hole is formed in the compression bolt; an inner screw hole is formed in the other end of the explosion-proof cover, a sealing ring is arranged at the bottom of the inner screw hole, and the electrode holder is in threaded connection with the inner screw hole of the explosion-proof cover; the cable is an anti-explosion cable, and the anti-explosion cable sequentially penetrates through a bolt wire passing hole in the compression bolt, the polytetrafluoroethylene sealing washer and the anti-explosion wire passing hole and then is electrically connected with the electrode. The explosion-proof device has an explosion-proof function and is suitable for being used in a second-area explosive gas environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electric contact water level meter, in particular to an explosion-proof electric contact water level meter. BACKGROUND

[0002] The electric contact water level meter is an intelligent instrument for monitoring the water level of a steam boiler drum or other pressure container. The electric contact water level meter is composed of a measuring cylinder and a secondary meter. The electrodes on the measuring cylinder are installed at positions corresponding to the light-emitting diodes on the secondary meter. The secondary meter displays the water level in the control room and performs sound and light alarm and interlocking control when the water level is abnormal.

[0003] The upper part of the measuring cylinder of the prior art electric contact water level meter is provided with a steam connecting pipe, the lower part is provided with a water connecting pipe, and the bottom is provided with a blowdown pipe. The electrode seats are arranged on the wall of the measuring cylinder between the steam connecting pipe and the water connecting pipe in an interval and staggered manner. The electrodes in the measuring cylinder are sealed and extended out of the corresponding electrode seats. The electrodes extended out of the electrode seats are electrically connected with the corresponding cables.

[0004] The boiler drum of a petrochemical plant is in a zone 2 explosive gas environment. The electric contact water level meter for observing the liquid level needs to be powered on to display the liquid level and must be explosion-proof to meet the explosion-proof level ExdbIIBT4Gb, ExdbIICT4Gb. The above-mentioned prior art electric contact water level meter does not have an explosion-proof function and is not suitable for use in a zone 2 explosive gas environment. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem of providing an explosion-proof electric contact water level meter with an explosion-proof function and suitable for use in a zone 2 explosive gas environment.

[0006] To solve the above technical problem, the utility model provides an explosion-proof electric contact water level meter, which comprises a measuring cylinder. The upper part of the measuring cylinder is provided with a steam connecting pipe, the lower part is provided with a water connecting pipe, and the bottom is provided with a blowdown pipe. The electrode seats are arranged on the wall of the measuring cylinder between the steam connecting pipe and the water connecting pipe in an interval and staggered manner. The electrodes in the measuring cylinder are sealed and extended out of the corresponding electrode seats. The electrodes extended out of the electrode seats are electrically connected with the corresponding cables. The utility model is characterized in that: a cylindrical explosion-proof cover is further provided. A cylindrical explosion-proof chamber is formed in the interior of the explosion-proof cover. The inner side of one end of the explosion-proof cover is provided with a cable passing hole, and the outer side is provided with a coaxial compression screw hole. A polytetrafluoroethylene sealing ring is arranged at the bottom of the compression screw hole. A compression bolt is screwed in the compression screw hole. A bolt passing hole is formed in the compression bolt. An inner screw hole is formed at the other end of the explosion-proof cover. A polytetrafluoroethylene sealing ring is arranged at the bottom of the inner screw hole. The electrode seat is threadedly connected with the inner screw hole of the explosion-proof cover. The cable is an explosion-proof cable. The explosion-proof cable passes through the bolt passing hole in the compression bolt, the polytetrafluoroethylene sealing ring, and the explosion-proof passing hole in sequence and is electrically connected with the electrode.

[0007] As the improvement of the utility model, further include the explosion -proof junction box, the explosion -proof junction box is equipped with the sealing cover, the explosion -proof junction box is installed with a plurality of explosion -proof cable clamping sealing joint, the explosion -proof cable of electrode electric connection respectively passes through the corresponding explosion -proof cable clamping sealing joint sealed and extends into the explosion -proof junction box, the explosion -proof junction box still is installed with the user cable sealing joint that can supply the user cable sealed and extends into the explosion -proof junction box.

[0008] As the further improvement of the utility model, further include the explosion -proof cover, the explosion -proof cable electric connection point of electrode is located in the explosion -proof cover.

[0009] The utility model has the following beneficial technical effects: one, the cylindrical explosion -proof cover set up can realize the effective isolation of the cylindrical explosion -proof chamber in explosion -proof cover and external environment, when using in 2 area explosive gas environment, will not produce explosion accident because of the spark or arc that the electrode and the electric connection point position of electrode and cable can produce in normal operation, two, after setting up the explosion -proof junction box, further improved the explosion -proof performance of the utility model, can provide better explosion -proof protection to the connecting place between explosion -proof cable and user cable, three, after using the technical features that the electric connection point of explosion -proof cable and electrode is located in the explosion -proof cover, can further improve the explosion -proof performance of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0010] The utility model will be further explained in detail in combination with the drawings.

[0011] Figure 1 It is the structural component schematic view of electric contact water level meter in the prior art.

[0012] Figure 2 It is the structural component schematic view of explosion -proof electric contact water level meter of the utility model.

[0013] Figure 3 It is Figure 2 The enlarged schematic view of structure in I of

[0014] Figure 4 It is Figure 3 The enlarged schematic view of cylindrical explosion -proof cover in

[0015] Figure 5 It is Figure 3 The enlarged schematic view of compression bolt in CONCRETE EMBODIMENT

[0016] Refer to Figure 2 - Figure 5The utility model discloses an explosion -proof electric contact water level gauge, including the measuring cylinder 1, the upper portion of measuring cylinder is equipped with steam connection pipe 2, is equipped with water connection pipe 3 in the lower part, is equipped with blowdown pipe 4 in the bottom, the electrode seat 5 of interval interlaced is equipped with on the measuring cylinder cylinder wall between steam connection pipe and water connection pipe, the electrode 6 in the measuring cylinder is sealed and extends out from the corresponding electrode seat, and the electrode that extends to the electrode seat outside is electrically connected with the corresponding cable 7, its characterized in that: still include the cylindrical explosion -proof cover 8, the inside of explosion -proof cover 8 forms the cylindrical explosion -proof chamber 80, the inside of one end of explosion -proof cover has cable through -hole 81, and the outside has the coaxial compression screw hole 82, and the bottom of compression screw hole is equipped with polytetrafluoroethylene sealing washer 83, and the compression bolt 84 is screwed in the compression screw hole, and the bolt through -hole 85 is set up in the compression bolt, the other end of explosion -proof cover is processed and has the internal thread 86, and the bottom of internal thread is equipped with polytetrafluoroethylene sealing ring 87, the electrode seat and the internal thread of explosion -proof cover are screwed together, the cable 7 is explosion -proof cable, and the explosion -proof cable passes through bolt through -hole 85 in the compression bolt, polytetrafluoroethylene sealing washer 83 and cable through -hole 81 in proper order and is electrically connected with the electrode.

[0017] It can be understood that the above specific description about the utility model, only for the description of the utility model and not limited to the technical scheme described in the utility model embodiment, all the modification or equivalent replacement to the utility model, to reach the same technical effect, are within the protection scope of the utility model.

Claims

1. An explosion-proof electric contact water level gauge, comprising a measuring tube (1), a steam connection tube (2) being mounted on the upper portion of the measuring tube, a water connection tube (3) being mounted on the lower portion, and a sewage pipe (4) being mounted on the bottom portion, electrode holders (5) being staggered and spaced apart on the wall of the measuring tube between the steam connection tube and the water connection tube, electrodes (6) being positioned in the measuring tube extending from corresponding sealed electrode holders, and electrodes extending outside the electrode holders being electrically connected to corresponding cables (7), characterized in that: The invention also includes a cylindrical explosion-proof cover (8), the interior of which is formed with a cylindrical explosion-proof chamber (80), the inner side of one end of the explosion-proof cover having a cable through hole (81), the outer side having a coaxial tightening screw hole (82), the bottom of the tightening screw hole being provided with a polytetrafluoroethylene sealing gasket (83), the inner screw hole being provided with a tightening bolt (84), and the tightening bolt being provided with a bolt through hole (85); the other end of the explosion-proof cover being processed with an inner screw hole (86), the bottom of the inner screw hole being provided with a polytetrafluoroethylene sealing ring (87), the electrode holder being threadedly connected to the inner screw hole of the explosion-proof cover; the cable (7) being an explosion-proof cable, the explosion-proof cable being passed through the bolt through hole (85), the polytetrafluoroethylene sealing gasket (83) and the cable through hole (81) in the tightening bolt in sequence and then being electrically connected to the electrode.

2. The explosion-proof electric contact water level gauge according to claim 1, characterized in that: The invention also includes an explosion-proof junction box (9), a sealing cover (90) is installed on the explosion-proof junction box, and a plurality of explosion-proof cable clamping and sealing joints (91) are installed on the explosion-proof junction box. The explosion-proof cables (7) electrically connected to the electrodes are respectively passed through the corresponding explosion-proof cable clamping and sealing joints and extend into the explosion-proof junction box in a sealed manner. The explosion-proof junction box is also equipped with a user cable sealing joint (92) for allowing user cables to extend into the explosion-proof junction box.

3. The explosion-proof electric contact water level gauge according to claim 1, characterized in that: It also includes a flameproof cover (10), and the electrical connection point between the explosion-proof cable and the electrode is located inside the flameproof cover.

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