Valve cavity negative pressure device and system

Abstract

The utility model provides a valve cavity negative pressure device and system. A valve cavity negative pressure device comprises a nozzle used for being connected with an inert gas source, a suction chamber used for being connected with a valve and a Venturi tube, the suction chamber is connected with the Venturi tube, the nozzle is connected with the suction chamber, and the suction chamber is provided with a connecting pipe used for being connected with the valve. By means of the Venturi tube principle, inner leakage medium disposal is achieved during fire connecting operation, and the medium is prevented from flowing to the downstream of a pipeline. Media leaked from the valve cavity are actively pumped out and discharged, negative pressure is built in the valve cavity, the sealing effect of the valve is further enhanced through active pumping and discharging, and the safety of pipeline fire operation is improved. The problems that gas leakage often occurs in sealing of a ball valve seat during fire operation, so that natural gas cannot be completely discharged from a valve cavity, the gas leakage phenomenon still occurs after grease injection treatment, gas blow-by is caused to a fire operation place, and explosion and fire accidents are caused are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas pipeline operation technical field especially relates to a valve cavity negative pressure device and system. BACKGROUND

[0002] With the advance of nationwide network construction, the interconnection and intercommunication engineering between pipelines increase day by day, and the problem that the valve with long-term use has a larger probability of internal leakage occurs, when the internal leakage cannot be effectively handled, it is necessary to expand the range of venting pipeline, causing a large amount of economic loss.

[0003] Due to process problems, natural gas transportation will be changed and expanded at stations, pipelines will be diverted on the pipeline, pipelines will be sunk on the river, and two pipelines will be interconnected, these engineering projects will all be connected by fire at the end. The valve cavity of the shut-off ball valve often has a slight leakage, in order to ensure the safety of the fire point, it is necessary to prevent natural gas overflow to the fire point.

[0004] During the operation of fire connection, the ball valve seat sealing problem often causes gas leakage, the valve cavity cannot discharge all the natural gas, and there is still gas leakage phenomenon after grease injection treatment, which causes gas channeling to the fire operation place and causes explosion and fire accidents. INVENTION CONTENTS

[0005] The utility model solves the technical problem in the prior art and provides a valve cavity negative pressure device and system.

[0006] The technical scheme for solving the above technical problem is as follows: a valve cavity negative pressure device comprises a nozzle for connecting an inert gas source, a suction chamber for connecting a valve, and a Venturi tube, the suction chamber is connected with the Venturi tube, the nozzle is connected with the suction chamber, and the suction chamber is provided with a connecting pipe for connecting the valve.

[0007] The beneficial effects of the technical scheme of the utility model are as follows: the Venturi tube principle is used to realize internal leakage medium disposal during the operation of fire connection, avoid medium flowing to the downstream of the pipeline, actively extract and discharge the medium leaked from the valve cavity, establish negative pressure in the valve cavity, and further strengthen the sealing effect of the valve to improve the safety of pipeline fire.

[0008] Further, the Venturi tube comprises a mixing pipe and a diffusion pipe, the mixing pipe and the diffusion pipe are both in a horn shape structure, one end of the mixing pipe is connected with the suction chamber, and one end of the diffusion pipe is connected with the other end of the mixing pipe.

[0009] The beneficial effect of the further technical scheme is that: the Venturi tube structure is formed through structural design, and the structure is simple, facilitating installation and maintenance.

[0010] Further, one end of the mixing pipe is larger in diameter than the other end of the mixing pipe, and one end of the diffusion pipe is smaller in diameter than the other end of the diffusion pipe.

[0011] The beneficial effect of the further technical scheme is that: the Venturi tube structure is formed through structural design, and the structure is simple, facilitating installation and maintenance.

[0012] Further, the nozzle is a conical structure, one end of the nozzle is located in the suction chamber, and the other end of the nozzle is used to connect an inert gas source.

[0013] The beneficial effect of the further technical scheme is that: the inert gas source is introduced into the suction chamber through the nozzle, and the nozzle and the suction chamber are facilitated to be installed and maintained.

[0014] Further, the suction chamber is a conical cavity, and one side of the suction chamber is provided with a connecting pipe used to connect a valve.

[0015] The beneficial effect of the further technical scheme is that: the suction chamber is connected with the valve, and the Venturi tube principle is utilized to dispose of the leaked medium during the hot-tapping operation, avoiding the medium flowing to the downstream of the pipeline. The leaked medium in the valve cavity is actively extracted and discharged, and a negative pressure is established in the valve cavity, and the active extraction and discharge further strengthen the sealing effect of the valve, improving the safety of the pipeline hot-tapping.

[0016] Further, the nozzle, the suction chamber and the Venturi tube are coaxially arranged.

[0017] The beneficial effect of the further technical scheme is that: the inert gas source is directly introduced into the suction chamber and the Venturi tube, so that a negative pressure is established in the valve cavity, and the natural gas in the valve cavity is actively drained.

[0018] Further, one side of the suction chamber is provided with an end cover mounted through bolts, the end cover is provided with a mounting hole used to mount the nozzle, the nozzle is mounted in the mounting hole, and the other side of the suction chamber is connected with the Venturi tube through bolts.

[0019] The beneficial effect of the further technical scheme is that the end cover is arranged to facilitate stable connection of the nozzle and the suction chamber, and facilitates installation and maintenance of the nozzle.

[0020] In addition, the utility model provides a valve cavity negative pressure system, including a valve cavity negative pressure device of above -mentioned any one still includes: inert gas source, valve, nozzle is connected with inert gas source through pipeline, is equipped with valve cavity in the valve, and the connecting pipe is connected with the valve cavity of valve through the pipeline.

[0021] The beneficial effect of the technical scheme is that the principle of the Venturi tube is used to realize disposal of the internal leakage medium during the hot work connection operation, avoid the medium flowing to the downstream of the pipeline, actively extract and discharge the medium leaked in the valve cavity, establish negative pressure in the valve cavity, and further strengthen the sealing effect of the valve to improve the safety of the hot work of the pipeline.

[0022] Further, the inert gas source is liquid nitrogen.

[0023] The beneficial effect of the further technical scheme is that the inert gas solves the explosion-proof problem, the liquid nitrogen has large gasification amount, is stable, has long gas source time, and has low cost.

[0024] Further, the valve is a shut-off ball valve in the oil and gas pipeline.

[0025] The beneficial effect of the further technical scheme is that the principle of the Venturi tube is used to realize disposal of the internal leakage medium during the hot work connection operation, avoid the medium flowing to the downstream of the pipeline, actively extract and discharge the medium leaked in the valve cavity, establish negative pressure in the valve cavity, and further strengthen the sealing effect of the valve to improve the safety of the hot work of the pipeline.

[0026] The advantages of the additional aspects of the utility model will be partly given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The structure schematic view of the valve cavity negative pressure device provided by the utility model embodiment.

[0028] Figure 2 The structure schematic view of the valve cavity negative pressure system provided by the utility model embodiment.

[0029] Explanation of reference numerals: 1, inert gas source; 2, nozzle; 3, valve; 4, suction chamber; 5, venturi; 6, connecting pipe; 7, mixing pipe; 8, diffusion pipe; 9, end cover. DETAILED DESCRIPTION

[0030] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not to limit the scope of the utility model.

[0031] As shown in the drawings, Figure 1 The utility model embodiment provides a valve cavity negative pressure device, including: nozzle 2 for connecting inert gas source 1, suction chamber 4 for connecting valve 3, venturi 5, the suction chamber 4 is connected with the venturi 5, the nozzle 2 is connected with the suction chamber 4, the suction chamber 4 is equipped with the connecting pipe 6 for connecting valve 3.

[0032] The beneficial effects of the technical scheme of the utility model are: the venturi principle is utilized, when the fire connection operation is carried out, the internal leakage medium disposal is realized, and the medium flow to the downstream pipe is avoided.The medium leaked from the valve cavity is actively extracted and discharged, and the negative pressure is established in the valve cavity, and the active extraction and discharge further strengthen the sealing effect of the valve, and the safety of the pipeline fire is improved.The problem that the ball valve seat sealing often leaks during the fire connection operation, the valve cavity cannot discharge all the natural gas, and the leakage phenomenon still exists after the grease injection treatment, and the gas channeling to the fire operation place causes the explosion and fire accident is solved.

[0033] Figure 1 The arrow in the drawing represents the flow direction and flow trajectory of nitrogen.

[0034] The utility model belongs to the field of oil and gas pipeline operation, and can solve the problem of ball valve seat sealing during the fire connection operation, and the leakage often occurs, the valve cavity cannot discharge all the natural gas, and the leakage phenomenon still exists after the grease injection treatment, and the gas channeling to the fire operation place causes the explosion and fire accident.

[0035] When the internal leakage of the key valve cannot be handled, and the on-site process must require no internal leakage, at this time, the idea can be changed from valve sealing treatment to internal leakage medium disposal, and the medium flow to the downstream pipe is avoided.

[0036] The previous treatment method is to set a valve cavity drainage pipe, utilize the medium leakage to cause the pressure rise of the valve cavity, and the medium is discharged from the drainage pipe by the self pressure, when the downstream sealing also has a problem or the impurities in the blowdown pipe are blocked, the medium still has the possibility to flow into the downstream pipe.

[0037] Through the actual situation of the scene, it is found that natural gas has the characteristics of flammable and explosive, which requires the tool to have certain explosion-proof ability, and the common vacuum pump on the market obviously does not meet the explosion-proof requirements.

[0038] The utility model discloses a kind of active tools (valve cavity negative pressure device), and the medium that leaks in valve cavity is actively extracted and discharged, and negative pressure is established in valve cavity, to further strengthen the sealing effect of valve.

[0039] As Figure 1 Further, the Venturi tube 5 includes a mixing tube 7 and a diffuser tube 8, both of which are of a horn shape structure, one end of the mixing tube 7 is connected with the suction chamber 4, and one end of the diffuser tube 8 is connected with the other end of the mixing tube 7.

[0040] The beneficial effects of the above further technical solutions are: the Venturi tube structure is formed by structural design. The structure is simple, easy to install and maintain. By using the principle of Venturi tube, the disposal of internal leakage medium is realized during the hot connection operation, and the flow of medium to the downstream of the pipeline is avoided. The medium that leaks in the valve cavity is actively extracted and discharged, and negative pressure is established in the valve cavity. The active extraction further strengthens the sealing effect of the valve, and improves the safety of the pipeline hot work.

[0041] As Figure 1 Further, the diameter of one end of the mixing tube 7 is greater than the diameter of the other end of the mixing tube 7, and the diameter of one end of the diffuser tube 8 is less than the diameter of the other end of the diffuser tube 8.

[0042] The beneficial effects of the above further technical solutions are: the Venturi tube structure is formed by structural design. The structure is simple, easy to install and maintain.

[0043] As Figure 1 Further, the nozzle 2 is of a conical structure, one end of the nozzle 2 is located in the suction chamber 4, and the other end of the nozzle 2 is used for connecting the inert gas source 1.

[0044] The beneficial effects of the above further technical solutions are: the inert gas source can be introduced into the suction chamber through the nozzle, and the installation and maintenance of the nozzle and the suction chamber are facilitated.

[0045] As Figure 1 Further, the suction chamber 4 is a conical cavity, and one side of the suction chamber 4 is provided with a connecting pipe 6 for connecting the valve 3.

[0046] The beneficial effect of the further technical scheme is that the suction chamber is connected with the valve, and the Venturi principle is used to realize the disposal of the internal leakage medium during the hot connection operation, so that the medium is prevented from flowing to the downstream of the pipeline.

[0047] As shown in Figure 1 Further, the nozzle 2, the suction chamber 4 and the Venturi tube 5 are coaxially arranged.

[0048] The beneficial effect of the further technical scheme is that the inert gas source is directly connected with the suction chamber and the Venturi tube, so that the negative pressure is established in the valve cavity, and the natural gas in the valve cavity is actively drained.

[0049] As shown in Figure 1 Further, one side of the suction chamber 4 is provided with an end cover 9 through bolts, the end cover 9 is provided with a mounting hole for mounting the nozzle 2, the nozzle 2 is mounted in the mounting hole, and the other side of the suction chamber 4 is connected with the Venturi tube 5 through bolts.

[0050] The beneficial effect of the further technical scheme is that the end cover is arranged to facilitate the stable connection of the nozzle and the suction chamber, and the installation and maintenance of the nozzle. The other side of the suction chamber is connected with the Venturi tube through bolts, so that the installation and maintenance of the suction chamber and the Venturi tube are facilitated.

[0051] The nut is sleeved on the nozzle 2. The position of the nozzle in the suction chamber is limited by rotating the nut. The nozzle 2 is installed in the mounting hole through threads, so that the position of the nozzle in the suction chamber is adjusted by rotating the nozzle.

[0052] The jet valve cavity vacuum tool (valve cavity negative pressure device) changes the passive leakage medium drainage into active leakage medium drainage, creates low vacuum in the valve cavity, improves the sealing effect of the valve, and enhances the safety of the pipeline hot work.

[0053] As shown in Figure 2 In addition, the utility model also provides a valve cavity negative pressure system, including the valve cavity negative pressure device of any one of the above, still include: inert gas source 1, valve 3, nozzle 2 is connected with inert gas source 1 through pipeline, be equipped with valve cavity in valve 3, connecting pipe 6 is connected with the valve cavity of valve 3 through pipeline.

[0054] The beneficial effect of the technical scheme of the utility model is: using Venturi tube principle, realizing internal leakage medium disposal when fire connecting operation, avoiding medium flowing to downstream of pipeline.

[0055] As shown in Figure 2 Further, the inert gas source 1 is liquid nitrogen.

[0056] The beneficial effect of the above further technical scheme is: inert gas solves explosion-proof problem, liquid nitrogen gasification amount is large and stable, gas source time is long, and cost is low.

[0057] As shown in Figure 2 Further, the valve 3 is a shut-off ball valve in the oil and gas pipeline.

[0058] The beneficial effect of the above further technical scheme is: using Venturi tube principle, realizing internal leakage medium disposal when fire connecting operation, avoiding medium flowing to downstream of pipeline.

[0059] 1) changing from original passive drainage to active drainage, further strengthening safety of valve internal leakage drainage.

[0060] 2) the device uses Venturi tube principle, the valve cavity becomes low vacuum environment after suction, the pressure difference before and after the valve is further increased, and the sealing effect is enhanced.

[0061] 3) inert gas solves explosion-proof problem, liquid nitrogen gasification amount is large and stable, gas source time is long, and cost is low.

[0062] 4) jet power source uses liquid nitrogen gasification high-pressure nitrogen jet, which is safe and reliable, and the tool uses nitrogen jet, which is less polluted, achieves explosion-proof effect, liquid nitrogen gasification amount is large and stable, gas source time is long, and cost is low.

[0063] 5) simple to make, convenient to use, and low cost.

[0064] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A valve chamber negative pressure device, characterized in that, include: A nozzle for connecting to an inert gas source, an intake chamber for connecting to a valve, and a venturi tube are provided. The intake chamber is connected to the venturi tube, and the nozzle is connected to the intake chamber. The intake chamber is provided with a connecting pipe for connecting to the valve. The venturi tube includes a mixing tube and a diffuser tube, both of which are funnel-shaped. One end of the mixing tube is connected to the intake chamber, and one end of the diffuser tube is connected to the other end of the mixing tube. The diameter of one end of the mixing tube is larger than the diameter of the other end of the mixing tube, and the diameter of one end of the diffuser tube is smaller than the diameter of the other end of the diffuser tube.

2. The valve chamber negative pressure device according to claim 1, characterized in that, The nozzle has a conical structure, with one end located in the suction chamber and the other end used to connect to an inert gas source.

3. The valve chamber negative pressure device according to claim 1, characterized in that, The suction chamber is a conical cavity, and a connecting pipe for connecting a valve is provided on one side of the suction chamber.

4. The valve chamber negative pressure device according to claim 1, characterized in that, The nozzle, the suction chamber, and the venturi tube are arranged coaxially.

5. A valve chamber negative pressure device according to claim 1, characterized in that, One side of the inhalation chamber is bolted to an end cap, which has a mounting hole for mounting a nozzle. The nozzle is installed in the mounting hole. The other side of the inhalation chamber is bolted to the venturi tube.

6. A valve chamber negative pressure system, characterized in that, The valve cavity negative pressure device according to any one of claims 1 to 5 further includes: an inert gas source, a valve, a nozzle connected to the inert gas source through a pipeline, the valve having a valve cavity, and a connecting pipe connected to the valve cavity through a pipeline.

7. A valve chamber negative pressure system according to claim 6, characterized in that, The inert gas source is liquid nitrogen.

8. A valve chamber negative pressure system according to claim 6, characterized in that, The valve in question is a shut-off ball valve used in oil and gas pipelines.

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