Stop valve for liquefied gas steel cylinder

Abstract

The utility model discloses a stop valve for a liquefied gas steel cylinder. The stop valve comprises a valve body, the upper end of the interior of the valve body is in threaded connection with a round sealing piece, the round sealing piece is connected with the lower end of the executing mechanism assembly in a clamped mode through a steel clamp, the upper end of the middle of the valve body is in threaded connection with the lower end of the executing mechanism assembly, and a movable iron core is slidably connected into an iron support of the executing mechanism assembly. A mounting cavity is formed in the valve body, a sealing plug is slidably connected into the mounting cavity, the lower end of the movable iron core and the upper end of the sealing plug are mounted in a matched mode, and the upper end of the mounting cavity communicates with a gas outlet pipeline of the valve body. When the valve body is opened, the movable iron core is directly and tightly attracted to the magnetic conductive support, and the movable iron core can react quickly while the valve body is kept to be opened stably.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquefied gas cylinder auxiliary equipment technical field, concretely for a kind of cut-off valve for liquefied gas cylinder. BACKGROUND

[0002] The cut-off valve for liquefied gas cylinder is important equipment in the safe use of liquefied gas, and its main function is to cut off the circulation of gas in the liquefied gas tank to avoid leakage or explosion accidents. The cut-off valve is composed of a multi-spring pneumatic diaphragm actuator or a floating piston actuator and a regulating valve, which is used to receive signals from regulating instruments to control the cut-off, connection or switching of fluid in the process pipeline. The main components include valve body, valve cover, valve seat, valve clapper (valve), valve stem (or valve shaft), etc. The valve clapper is the key component of the cut-off valve, and its movement determines the circulation state of the fluid.

[0003] The existing cut-off valve is mainly composed of a pneumatic diaphragm actuator, a single / double seat valve body, a spring, and a piston. When the regulating instrument sends a signal, the pneumatic diaphragm actuator receives the signal and generates a corresponding action. Through the transmission of the spring and the piston, the valve clapper moves in the valve seat, thereby controlling the cut-off, connection or switching of fluid.

[0004] This type of cut-off valve has some problems, such as the need for bolts to connect the valve body and the actuator assembly with the assistance of flanges, the lack of sealing components affecting the air tightness of the cut-off valve, and the complex moving iron core limiting mechanism inside the actuator assembly, which is not conducive to the rapid response of the moving iron core. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem of overcoming the existing defects and provides a cut-off valve for liquefied gas cylinder. The round sealing element realizes stable sealing at the connection between the actuator assembly and the valve body with a simple structure. When the valve body is opened, the moving iron core is directly attracted to the magnetic guide bracket, which maintains the stability of the valve body opening and facilitates the rapid response of the moving iron core, effectively solving the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a cut-off valve for liquefied gas cylinder, comprising a valve body;

[0007] The valve body is internally screwed at the upper end with a round sealing piece, the round sealing piece is clamped with the lower end of the actuator assembly through a steel clamp, the upper end of the middle part of the valve body is screwed with the lower end of the actuator assembly, the movable iron core is slidably connected in the iron support of the actuator assembly, a mounting cavity is arranged at the central position in the valve body, a sealing plug is slidably connected in the mounting cavity, the lower end of the movable iron core is matched with the upper end of the sealing plug, the upper end of the mounting cavity is communicated with the gas outlet pipeline of the valve body, the right end of the mounting cavity is communicated with the gas inlet pipeline of the valve body, the round sealing piece realizes stable sealing of the connection between the actuator assembly and the valve body with a simple structure, and the movable iron core is directly and closely attracted to the magnetic guide support when the valve body is opened, so that the movable iron core can quickly respond while the valve body is kept open and stable.

[0008] Further, the upper end of the mounting cavity is screwed with a hexagonal valve port, a steel needle is slidably connected between the hexagonal valve port and the round sealing piece, and the lower end of the steel needle is matched with the upper end of the sealing plug, so as to provide driving force for the movement of the sealing plug.

[0009] Further, the lower end of the sealing plug is clamped with a stainless steel cap, and the lower surface of the stainless steel cap is reset connected with the bottom wall of the mounting cavity through a spring, so as to provide driving force for the reset of the sealing plug.

[0010] Further, the upper end of the movable iron core is fixedly connected with a lifting handle through a support rod, the outer surface of the support rod is slidably connected with the upper end of the actuator assembly, the lower end of the actuator assembly is provided with a magnetic guide support, the magnetic guide support is matched with the movable iron core, the middle part of the magnetic guide support is fixedly connected with a coil, the input end of the coil is electrically connected with the output end of the external alarm, so as to reset the movable iron core.

[0011] Further, the upper end of the actuator assembly is provided with a dust cover through a pressing piece, the dust cover is matched with the lifting handle, so as to avoid accidental touch of the lifting handle and avoid dust entering the actuator assembly.

[0012] Further, the right end in the valve body is screwed with a gas inlet pipe, the right end of the outer surface of the gas inlet pipe is sleeved with a rubber pad, the outer surface of the gas inlet pipe is rotatably connected with a hand wheel, and the inner surface of the hand wheel is fixedly connected with a threaded sleeve, so as to realize the connection between the cut-off valve and the gas source.

[0013] Further, the left end in the valve body is provided with a gas outlet, and the inner wall of the gas outlet is provided with an internal thread, so as to realize the stable connection between the cut-off valve and the exhaust equipment.

[0014] Compared with the prior art, the cut-off valve for the liquefied gas cylinder has the following advantages:

[0015] The round sealing piece and the steel card cooperate, the round sealing piece realizes stable sealing of the connection between the actuator assembly and the valve body with simple structure, the moving iron core is directly and closely attracted to the magnetic guide support when the valve body is opened, the stability of the valve body opening is realized, the quick response of the moving iron core is facilitated, and the quick cut-off of the gas passage is realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a structural schematic view of the utility model;

[0017] Fig. 2 It is a sectional structural schematic view of the utility model.

[0018] In the drawing: 1 hand wheel, 2 valve body, 3 air inlet pipe, 4 rubber pad, 5 spring, 6 sealing plug, 7 stainless steel cap, 8 steel needle, 9 actuator assembly, 10 dust cover, 11 lifting twist, 12 moving iron core, 13 pressing piece, 14 round sealing piece, 15 hexagonal valve port, 16 steel card, 17 coil, 18 magnetic guide support, 19 supporting rod, 20 air outlet. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] Please refer to Figs. 1-2 The embodiment provides a technical scheme: a cut-off valve for a liquefied gas steel cylinder, which comprises a valve body 2;

[0021] Valve body 2: the upper end of its inside is screwed with round seal 14, round seal 14 is clamped with the lower end of actuator assembly 9 through steel clamp 16, the upper end of the middle of valve body 2 is screwed with the lower end of actuator assembly 9 (actuator assembly 9 is actuator shell), the inside of iron support of actuator assembly 9 is slidably connected with moving iron core 12, the center position of the inside of valve body 2 is provided with installation cavity, the inside of installation cavity is slidably connected with sealing plug 6, the lower end of moving iron core 12 is installed with the upper end of sealing plug 6, the upper end of installation cavity is communicated with the gas outlet pipeline of valve body 2, the right end of installation cavity is communicated with the gas inlet pipeline of valve body 2, the upper end of installation cavity is screwed with hexagonal valve port 15, hexagonal valve port 15 and the inside of round seal 14 are slidably connected with steel needle 8, the lower end of steel needle 8 is installed with the upper end of sealing plug 6, the lower end of sealing plug 6 is clamped with stainless steel cap 7, the lower surface of stainless steel cap 7 and the bottom wall of installation cavity are fixedly connected with spring 5, the upper end of moving iron core 12 is fixedly connected with pull twist 11 through support rod 19, the outer surface of support rod 19 is slidably connected with the upper end of actuator assembly 9, the lower end of the inside of actuator assembly 9 is provided with magnetic guide support 18, magnetic guide support 18 and moving iron core 12 are installed in cooperation, the middle of magnetic guide support 18 is fixedly connected with coil 17, the input end of coil 17 is electrically connected with the output end of external alarm, pull twist 11 is pressed, pull twist 11 moves down and pushes moving iron core 12 down through support rod 19, moving iron core 12 moves down and pushes steel needle 8 down, steel needle 8 moves down and pushes sealing plug 6 to move down in the inside of installation cavity, sealing plug 6 moves down and stops sealing the connection between installation cavity and gas inlet channel, at the same time, sealing plug 6 moves down and drives stainless steel cap 7 to move down, stainless steel cap 7 moves down and makes spring 5 elastically compressed, the gas in liquefied gas cylinder enters installation cavity through gas inlet pipe 3, then enters gas outlet 20 through gas outlet pipeline, and then enters the lower moving work area, at this time, valve body 2 is in the open state, when moving iron core 12 moves down and contacts with magnetic guide support 18, moving iron core 12 directly and closely contacts with magnetic guide support 18, which guarantees the stability of valve body 2 in the open state, when the external alarm alarms, the external alarm sends electric signal to coil 17, then coil 17 is electrified, the magnetic force generated by the electrification of coil 17 acts on moving iron core 12, the elastic force of spring 5 pushes sealing plug 6 to move up through stainless steel cap 7, sealing plug 6 moves up and pushes steel needle 8 to move up, and then pushes moving iron core 12 to move up, sealing plug 6 reseals the connection between installation cavity and gas inlet channel;

[0022] Wherein: the upper end of actuator assembly 9 is provided with dust cover 10 through pressing piece 13, dust cover 10 is installed in cooperation with pull twist 11, dust cover 10 realizes the all-round protection of pull twist 11, and simultaneously avoids dust from entering cut-off valve;

[0023] The right end of the valve body 2 is threadedly connected with an air inlet pipe 3, the right end of the outer surface of the air inlet pipe 3 is sleeved with a rubber pad 4, the outer surface of the air inlet pipe 3 is rotationally connected with a hand wheel 1, the inside of the hand wheel 1 is fixedly connected with a threaded sleeve, the left end of the inside of the valve body 2 is provided with an air outlet 20, the inner wall of the air outlet 20 is provided with an internal thread, the air inlet pipe 3 is threadedly connected with the right end of the valve body 2, after the air inlet pipe 3 and the valve body 2 are stably connected, the hand wheel 1 is rotated, the rotation of the hand wheel 1 drives the rotation of the threaded sleeve, the threaded sleeve is stably connected with the air outlet of the liquefied gas cylinder, the rubber pad 4 improves the sealing performance of the connection between the air inlet pipe 3 and the air outlet of the liquefied gas cylinder, after the connection is stable, the hand wheel 1 is stopped from rotating, and the internal thread of the air outlet 20 is stably connected with an external exhaust device, so that the stable installation of the cut-off valve is realized.

[0024] The working principle of the cut-off valve for the liquefied gas cylinder is as follows: in operation, a person first rotates the hand wheel 1, the rotation of the hand wheel 1 drives the rotation of the threaded sleeve, the threaded sleeve is stably connected with the air outlet of the liquefied gas cylinder, the rubber pad 4 improves the sealing performance of the connection between the air inlet pipe 3 and the air outlet of the liquefied gas cylinder, after the connection is stable, the person stops rotating the hand wheel 1, and the internal thread of the air outlet 20 is stably connected with an external exhaust device, so that the stable installation of the cut-off valve is realized, after the installation is completed, the person presses the lifting handle 11, the lifting handle 11 moves downward to push the moving iron core 12 to move downward through the supporting rod 19, the moving iron core 12 moves downward to push the steel needle 8 to move downward, the steel needle 8 moves downward to push the sealing plug 6 to move downward in the installation cavity, the sealing plug 6 moves downward to stop plugging the connection between the installation cavity and the air inlet channel, at the same time, the sealing plug 6 moves downward to drive the stainless steel cap 7 to move downward, the stainless steel cap 7 moves downward to make the spring 5 elastically compressed, the gas in the liquefied gas cylinder enters the installation cavity through the air inlet pipe 3, then enters the air outlet 20 through the air outlet pipe, and then enters the downward working area, at this time, the valve body 2 is in an open state, when the moving iron core 12 contacts with the magnetic conduction support 18, the moving iron core 12 is directly and closely combined with the magnetic conduction support 18, so that the stability of the open state of the valve body 2 is ensured, when the external alarm alarms, the external alarm sends an electric signal to the coil 17, then the coil 17 is electrified, the magnetic force generated by the electrification of the coil 17 acts on the moving iron core 12, the elastic force of the spring 5 pushes the sealing plug 6 to move upward through the stainless steel cap 7, the sealing plug 6 moves upward to push the steel needle 8 to move upward, and then the moving iron core 12 is pushed to move upward, and the sealing plug 6 re-plugs the connection between the installation cavity and the air inlet channel.

[0025] It is worth noting that the external alarm control actuator assembly 9 disclosed in the above embodiments all adopts the method commonly used in the prior art.

[0026] The above merely illustrates the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are made by using the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. A shut-off valve for a liquefied gas cylinder, characterized by: The valve body (2) includes a circular sealing element (14) screwed to the upper end of the valve body (2), a steel clamp (16) connected to the lower end of the actuator assembly (9), a dynamic iron core (12) slidably connected to the iron support of the actuator assembly (9), an installation cavity provided in the center of the valve body (2), a sealing plug (6) slidably connected to the installation cavity, the lower end of the dynamic iron core (12) being fitted with the upper end of the sealing plug (6), the upper end of the installation cavity being in communication with the gas outlet pipeline of the valve body (2), and the right end of the installation cavity being in communication with the gas inlet pipeline of the valve body (2). The upper end of the dynamic iron core (12) is fixedly connected with a lifting handle (11) through a support rod (19), the outer surface of the support rod (19) is slidably connected with the upper end of the actuator assembly (9), the lower end of the actuator assembly (9) is provided with a magnetic guide bracket (18), the middle part of the magnetic guide bracket (18) is fixedly connected with a coil (17), and the input end of the coil (17) is electrically connected with the output end of the external alarm. The upper end of the installation cavity is screwed with a hexagonal valve port (15), a steel needle (8) is slidably connected between the hexagonal valve port (15) and the circular sealing element (14), and the lower end of the steel needle (8) is fitted with the upper end of the sealing plug (6).

2. A cut-off valve for a liquefied gas cylinder according to claim 1, wherein: The lower end of the sealing plug (6) is clamped with a stainless steel cap (7), and the lower surface of the stainless steel cap (7) and the bottom wall of the installation cavity are fixedly connected with a spring (5).

3. A cut-off valve for a liquefied gas cylinder as defined in claim 1, wherein: The upper end of the actuator assembly (9) is provided with a dust cover (10) through a pressing piece (13), and the dust cover (10) is fitted with the actuator assembly (9).

4. A cut-off valve for a liquefied gas cylinder as defined in claim 1, wherein: The right end of the valve body (2) is screwed with a gas inlet pipe (3), the right end of the outer surface of the gas inlet pipe (3) is sleeved with a rubber pad (4), the outer surface of the gas inlet pipe (3) is rotatably connected with a hand wheel (1), and the inner surface of the hand wheel (1) is fixedly connected with a threaded sleeve.

5. A cut-off valve for a liquefied gas cylinder as defined in claim 1, wherein: The left end of the valve body (2) is provided with a gas outlet (20), and the inner wall of the gas outlet (20) is provided with an internal thread.

6. A cut-off valve for a liquefied gas cylinder as defined in claim 1, wherein: ​

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