Air-tight seal negative pressure blowout preventer

Abstract

The utility model discloses an air-tight seal negative pressure blowout preventer, which comprises a sleeve main body and a plurality of locking cylinder assemblies, the sleeve main body is of a split barrel-shaped structure and comprises a first half sleeve and a second half sleeve, and the first half sleeve and the second half sleeve are connected through the plurality of locking cylinder assemblies; the upper end and the lower end of the interior of the sleeve body are each provided with an annular pneumatic tire, a negative pressure air inlet and a liquid outlet are formed in the sleeve wall of the sleeve body, a negative pressure liquid discharging device is arranged at the liquid outlet, the negative pressure air inlet and the liquid outlet are both located between the two annular pneumatic tires, and the negative pressure air inlet is located above the liquid outlet. An air inlet pipe is arranged on the outer wall of the sleeve main body, the air inlet pipe is communicated with the two circular-ring-shaped pneumatic tires, the air inlet pipe is used for being communicated with an air source, air is supplied to the circular-ring-shaped pneumatic tires through the air source, and the air inlet pipe is connected with a switch valve; slurry preparation materials are saved, and the risks that workers are stabbed by splashed hot slurry and the workers slip down from a drill floor can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to well drilling technical field, concretely is a kind of gas seal negative pressure blowout preventer. BACKGROUND

[0002] Now domestic well drilling industry develops for many years, mud spouting phenomenon in the operation of jointing and tripping in several decades has been accompanied in construction, and mud spouting in the present domestic well drilling construction drilling tool is generally prevented by using cloth and barrel-shaped blowout preventer box to block mud, this phenomenon mainly brings the following hazards: 1, cause a large amount of mud loss, consume a large amount of mud preparation material.2, personnel is splashed by hot mud and stung, drilling platform surface is wet and slippery, which can easily cause personnel to slip and get injured.3, a large amount of sanitary standard non-productive labor is produced, a large amount of manpower and material resources are consumed, and work risk is increased by climbing operation.4, environmental protection is brought.5, long mud placement time affects tripping efficiency.6, due to tripping mud spouting consumption, the on-duty worker cannot accurately measure the volume of drilling tool, which increases the risk of overflow in oil and gas layer drilling. SUMMARY

[0003] The utility model aims at providing a kind of gas seal negative pressure blowout preventer, to solve the problems presented in the above background technology.

[0004] The utility model is realized as follows:

[0005] A kind of gas seal negative pressure blowout preventer, including sleeve main body, still including locking cylinder assembly, the sleeve main body is for split barrel type structure, including first half sleeve and second half sleeve, the first half sleeve and second half sleeve are connected by multiple locking cylinder assembly;Upper end and lower end in the sleeve main body interior each are provided with one annular air tire, negative pressure inlet and liquid discharge port are provided on the barrel wall of the sleeve main body, negative pressure liquid discharge equipment is provided at the liquid discharge port, the negative pressure inlet and liquid discharge port are located between two annular air tires, and the negative pressure inlet is located above the liquid discharge port;Air inlet pipe is provided on the outer wall of the sleeve main body, the air inlet pipe is communicated with two annular air tires, the air inlet pipe is used to connect gas source, and the annular air tire is supplied with gas by gas source, the air inlet pipe is connected with switch valve.

[0006] Preferably, the switch valve is connected with a pressure reducing valve through a pipeline, and the pressure reducing valve is connected with the gas source through a pipeline.

[0007] Preferably, a negative pressure inlet pipe is provided at the negative pressure inlet, the negative pressure inlet pipe is an L-shaped pipe, the negative pressure inlet pipe includes a vertical pipe portion and a horizontal pipe portion, and the horizontal pipe portion is located at the upper end of the vertical pipe portion, the vertical pipe portion of the negative pressure inlet pipe is located in the sleeve main body, and the horizontal pipe portion of the negative pressure inlet pipe passes through the negative pressure inlet.

[0008] Preferably, the negative pressure drainage device is a negative pressure rotating nozzle or a negative pressure drainage pump, a liquid inlet end of the negative pressure drainage device is connected with the liquid outlet, and a liquid discharge pipe is connected with a liquid discharge end.

[0009] Preferably, a plurality of locking cylinder assemblies are arranged on each of the two abutting positions of the first half sleeve and the second half sleeve.

[0010] Preferably, the locking cylinder assembly comprises a first mounting plate, a locking cylinder and a second mounting plate, the first mounting plate and the second mounting plate are fixedly connected with the first half sleeve and the second half sleeve respectively, the locking cylinder is horizontally mounted on the first mounting plate, and a piston rod of the locking cylinder assembly is connected with the second mounting plate.

[0011] Preferably, the first mounting plate comprises a first arc-shaped plate portion and a first straight plate portion, the first arc-shaped plate portion is connected with the outer wall of the first half sleeve in a fit manner, and the locking cylinder is mounted on the first straight plate portion.

[0012] Preferably, the second mounting plate comprises a second arc-shaped plate portion and a second straight plate portion, the second arc-shaped plate portion is connected with the outer wall of the second half sleeve in a fit manner, the first straight plate portion and the second straight plate portion are parallel to each other when the first half sleeve and the second half sleeve are arranged oppositely, and the piston rod of the locking cylinder is connected with the second straight plate portion through bolts.

[0013] Preferably, the locking cylinder assembly comprises a first mounting plate, a locking cylinder, a second mounting plate and a locking block, the first mounting plate comprises a first arc-shaped plate portion and a first straight plate portion, the first arc-shaped plate portion is connected with the outer wall of the first half sleeve in a fit manner, and the locking cylinder is horizontally mounted on the first straight plate portion; the second mounting plate comprises a second arc-shaped plate portion and a second straight plate portion, the second arc-shaped plate portion is connected with the outer wall of the second half sleeve in a fit manner, the first straight plate portion and the second straight plate portion are parallel to each other when the first half sleeve and the second half sleeve are arranged oppositely; the locking block is arranged on the top of the piston rod of the locking cylinder, an opening is arranged on the second straight plate portion, the locking block comprises a locking portion which cannot pass through the opening, and the piston rod of the locking cylinder can pass through the opening.

[0014] Preferably, the locking block further comprises a screw rod portion which can pass through the opening, a threaded hole is arranged at the top end of the piston rod of the locking cylinder, and the locking block is mounted on the piston rod of the locking cylinder through the screw rod portion.

[0015] Compared with the prior art, the mud spraying device has the following beneficial effects:

[0016] 1. The mud spraying device can save mud preparation materials and prevent personnel from being injured by splashed hot mud and from slipping on a drilling platform.

[0017] 2、 The utility model discloses can reduce the health standardization non-productive labor, save manpower and material resources and the work risk of climbing operation, and reduce the pressure of drilling production environmental protection.

[0018] 3、 The utility model discloses the use can improve the special tripping time, reduce the mud loss of special tripping can help the accurate metering of the grouting and the volume of the belt of the on-duty worker, can find the overflow of tripping in time, improve the well control safety factor.

[0019] 4、 The utility model discloses set up negative pressure drainage equipment at the drainage port, through setting up negative pressure drainage equipment 6 can realize the negative pressure suction, and mud is quickly sucked and is discharged to the anti -overflow pipe under the drilling platform through the drainage pipe, realizes the quick recovery of mud. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structural schematic diagram of the utility model, and the utility model discloses a sleeve main part of drilling rig.

[0021] Figure 2 It is the three -dimensional structure schematic diagram of sleeve main part of the utility model.

[0022] Figure 3 It is the front view of sleeve main part of the utility model.

[0023] Figure 4 It is the top view of sleeve main part of the utility model.

[0024] Figure 5 It is the three -dimensional structure schematic diagram of locking cylinder subassembly of the utility model embodiment 1.

[0025] Figure 6 It is the three -dimensional structure schematic diagram of locking cylinder subassembly of the utility model embodiment 2.

[0026] In the drawing: 1, sleeve main part, 2, locking cylinder subassembly, 201, first mounting plate, 202, locking cylinder, 203, second mounting plate, 204, locking block, 3, circular ring air tire, 4, air inlet pipe, 5, switch valve, 6, negative pressure drainage equipment, 7, pressure reducing valve, 8, negative pressure air inlet pipe, 9, drainage pipe, 10, drilling tool, 11, elevator. DETAILED DESCRIPTION

[0027] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated; can be mechanical connection, also can be electrical connection; can be direct connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements. For ordinary skilled in the art, the above terms can be understood according to the specific meaning of the utility model.

[0028] The following further illustrates with the specific embodiments and the accompanying drawings:

[0029] Example 1

[0030] As Figures 1-4 shown, a kind of airtight negative pressure blowout preventer, including sleeve main body 1 and multiple locking cylinder assemblies 2, sleeve main body 1 is installed on the elevator 11.Sleeve main body 1 is open type barrel structure, including first half sleeve and second half sleeve, and the first half sleeve and the second half sleeve are connected by multiple locking cylinder assemblies 2.The upper end and the lower end in sleeve main body 1 are each provided with a circular air cell 3, the inner diameter of circular air cell 3 is 250mm when on call, and is reduced to 80mm after inflation, so that the clamping sealing of commonly used drill 10 in ultra-deep well can be realized.In order to position circular air cell 3, annular limiting platform can be provided on the inner wall of sleeve main body 1.Air inlet pipe 4 is provided on the outer wall of sleeve main body 1, air inlet pipe 4 uses metal pipe, and the upper and lower ends are both sealed.The side wall of the upper and lower ends of air inlet pipe 4 is each provided with a gas charging connecting pipe, and air inlet pipe 4 is communicated with two circular air cells 3 through gas charging connecting pipe, and air inlet pipe 4 is used to connect gas source, and gas is supplied to circular air cell 3 by gas source, and the gas source can come from air compressor.On-off valve 5 is connected with pressure reducing valve 7 through pipeline, and pressure reducing valve 7 is connected with gas source through pipeline.Pressure reducing valve 7 is used for pressure reduction and safety protection, to prevent the overpressure of circular air cell 3 from being inflated.The exhaust pressure of pressure reducing valve 7 is set before circular air cell 3 is inflated, and when circular air cell 3 is inflated, on-off valve 5 is opened, and after inflation, on-off valve 5 is closed, so that circular air cell 3 maintains the inflated state.

[0031] As Figure 2 , Figure 4 and Figure 5As shown, a set of locking cylinder assemblies 2 is arranged at each of the two abutments of the first half sleeve and the second half sleeve, each set of locking cylinder assemblies 2 has three locking cylinder assemblies 2, and the three locking cylinder assemblies 2 are arranged in sequence and uniformly along the axial direction of the sleeve body 1. The locking cylinder assembly 2 comprises a first mounting plate 201, a locking cylinder 202 and a second mounting plate 203, and the first mounting plate 201 and the second mounting plate 203 are fixedly connected with the first half sleeve and the second half sleeve respectively. The first mounting plate 201 comprises a first arc-shaped plate portion and a first straight plate portion, the first arc-shaped plate portion is connected with the outer wall of the first half sleeve by welding, and the locking cylinder 202 is horizontally mounted on the first straight plate portion. The second mounting plate 203 comprises a second arc-shaped plate portion and a second straight plate portion, the second arc-shaped plate portion is connected with the outer wall of the second half sleeve by welding, and when the first half sleeve and the second half sleeve are arranged oppositely, the first straight plate portion and the second straight plate portion are parallel to each other, and the piston rod of the locking cylinder 202 is detachably connected with the second straight plate portion by bolts. Sealing structures such as sealing glue and sealing pads should be arranged at the two abutments of the first half sleeve and the second half sleeve. When the first half sleeve and the second half sleeve are abutted, the locking cylinder 202 is started, the piston rod of the locking cylinder 202 drives the second half sleeve to move towards the first half sleeve through the second mounting plate 203, and the movement continues until the first half sleeve and the second half sleeve are pressed against each other. When it is needed to separate the first half sleeve and the second half sleeve, the locking cylinder 202 is started in reverse.

[0032] As shown in Figure 1 and Figure 3 As shown, the sleeve body 1 is provided with a negative pressure air inlet and a liquid discharge port on the cylinder wall, and the negative pressure air inlet and the liquid discharge port are located between the two annular air tires 3, and the negative pressure air inlet is located above the liquid discharge port. A negative pressure air inlet pipe 8 is arranged at the negative pressure air inlet, the negative pressure air inlet pipe 8 is an L-shaped pipe, the negative pressure air inlet pipe 8 comprises a vertical pipe portion and a horizontal pipe portion, and the horizontal pipe portion is located at the upper end of the vertical pipe portion, the vertical pipe portion of the negative pressure air inlet pipe 8 is located in the sleeve body 1, and the horizontal pipe portion of the negative pressure air inlet pipe 8 passes through the negative pressure air inlet. A negative pressure liquid discharge device 6 is arranged at the liquid discharge port, the liquid inlet end of the negative pressure liquid discharge device 6 is connected with the liquid discharge port, and the liquid discharge end is connected with a liquid discharge pipe 9. By arranging the negative pressure liquid discharge device 6, negative pressure suction can be achieved, the mud can be quickly sucked in and discharged through the liquid discharge pipe 9 to the anti-overflow pipe under the drilling platform, and the mud can be quickly recovered. The negative pressure liquid discharge device 6 is a negative pressure rotary nozzle or a negative pressure liquid discharge pump, and the negative pressure liquid discharge pump can also be directly called a liquid discharge pump, and the negative pressure here means that a negative pressure is generated. There are many ways to generate negative pressure, such as by driving the impeller to rotate by a motor.

[0033] Example 2

[0034] As shown in Figures 1-4As shown, a kind of air-tight negative pressure anti-spraying device, including sleeve body 1 and multiple locking cylinder assemblies 2, sleeve body 1 is installed on the elevator 11.Sleeve body 1 is the structure of barrel type of opposite opening, including first half sleeve and second half sleeve, and first half sleeve and second half sleeve are connected by multiple locking cylinder assemblies 2.The upper end and the lower end in sleeve body 1 are each provided with one annular air tire 3, the inner diameter of annular air tire 3 is 250mm when on standby, and it is reduced to 80mm after inflation, can realize the clamping sealing of the drill tool 10 commonly used in ultra-deep well.In order to position annular air tire 3, annular limiting platform can be set on the inner wall of sleeve body 1.The outer wall of sleeve body 1 is provided with air inlet pipe 4, air inlet pipe 4 uses metal pipe, and its upper and lower ends are both sealed.The sidewall of the upper and lower ends of air inlet pipe 4 is each provided with one inflation connecting pipe, and air inlet pipe 4 is communicated with two annular air tires 3 through inflation connecting pipe, and air inlet pipe 4 is used to connect gas source, and annular air tire 3 is supplied with gas by gas source, and gas source can come from air compressor.On-off valve 5 is connected with pressure reducing valve 7 by pipeline, and pressure reducing valve 7 is connected with gas source by pipeline.Pressure reducing valve 7 is used for pressure reduction and safety protection, to prevent air pressure from being too large to inflate annular air tire 3.Before annular air tire 3 is inflated, the exhaust pressure of pressure reducing valve 7 is set first.When annular air tire 3 is inflated, open on-off valve 5, after inflation, close on-off valve 5, so that annular air tire 3 maintains inflation state.

[0035] As Figure 2 、 Figure 4 and Figure 6As shown, each of the two abutments of the first half sleeve and the second half sleeve is provided with a set of locking cylinder assemblies 2, each set of locking cylinder assemblies 2 has three locking cylinder assemblies 2, and the three locking cylinder assemblies 2 are uniformly arranged in sequence along the axial direction of the sleeve body 1. The locking cylinder assembly 2 comprises a first mounting plate 201, a locking cylinder 202, a second mounting plate 203 and a locking block 204, the first mounting plate 201 comprises a first arc-shaped plate part and a first straight plate part, the first arc-shaped plate part is connected by welding in close contact with the outer wall of the first half sleeve, and the locking cylinder 202 is horizontally mounted on the first straight plate part. The second mounting plate 203 comprises a second arc-shaped plate part and a second straight plate part, the second arc-shaped plate part is connected by welding in close contact with the outer wall of the second half sleeve, and when the first half sleeve and the second half sleeve are arranged oppositely, the first straight plate part and the second straight plate part are parallel to each other. The second straight plate part is provided with an opening, the locking block 204 comprises a locking part which cannot pass through the opening and a screw part which can pass through the opening, and the piston rod of the locking cylinder 202 can pass through the opening. The top end of the piston rod of the locking cylinder 202 is provided with a threaded hole, and the locking block 204 is mounted on the piston rod of the locking cylinder 202 through the screw part thereof. The two abutments of the first half sleeve and the second half sleeve should be provided with sealing structures such as sealing glue and sealing gasket, when the first half sleeve and the second half sleeve are abutted, the locking cylinder 202 is started, the piston rod of the locking cylinder 202 drives the locking block 204 to move towards the locking cylinder 202, the locking part of the locking block 204 pulls the second half sleeve to move towards the first half sleeve, until the first half sleeve and the second half sleeve are pressed tightly. The locking cylinder assembly 2 with such structure can effectively prevent the problem that reverse operation of the locking cylinder 202 causes the first half sleeve and the second half sleeve to separate accidentally.

[0036] As shown in Figure 1 and Figure 3 As shown, the sleeve body 1 is provided with a negative pressure air inlet and a liquid discharge port on the cylinder wall, the negative pressure air inlet and the liquid discharge port are located between the two annular air tires 3, and the negative pressure air inlet is located above the liquid discharge port. The negative pressure air inlet is provided with a negative pressure air inlet pipe 8, the negative pressure air inlet pipe 8 is an L-shaped pipe, the negative pressure air inlet pipe 8 comprises a vertical pipe part and a horizontal pipe part, and the horizontal pipe part is located at the upper end of the vertical pipe part, the vertical pipe part of the negative pressure air inlet pipe 8 is located in the sleeve body 1, and the horizontal pipe part of the negative pressure air inlet pipe 8 passes through the negative pressure air inlet. The liquid discharge port is provided with a negative pressure liquid discharge device 6, the liquid inlet end of the negative pressure liquid discharge device 6 is connected with the liquid discharge port, the liquid discharge end is connected with a liquid discharge pipe 9, by arranging the negative pressure liquid discharge device 6, negative pressure suction can be realized, the mud is quickly sucked and discharged through the liquid discharge pipe 9 to the anti-overflow pipe under the drilling platform, and the mud is quickly recovered.

[0037] The utility model discloses a working principle: the utility model utilizes the circular ring air tire 3 inflation and expands and tightly packs the drill 10 to realize up and down sealing, and the inner diameter is 250mm when the circular ring air tire 3 is on standby, and reduces to 80mm after inflation and expansion, can realize the clamping sealing of the drill 10 commonly used in super deep well. The sleeve main body 1 is clamped and realizes the centering and realizes the shell sealing through the locking cylinder assembly 2. The drainage port is arranged above the circular ring air tire 3 of the lower part of the sleeve main body 1 and is used for discharging the mud liquid sprayed in the water hole after the buckle is unhooked, and the negative pressure air inlet and the negative pressure air inlet pipe 8 are arranged above the drainage port and below the upper circular ring air tire 3 on the sleeve main body 1, are used for supplementing air to facilitate drainage. The negative pressure drainage equipment 6 is arranged at the drainage port, and through the setting of the negative pressure drainage equipment 6, negative pressure suction can be realized, the mud is quickly sucked and discharged to the anti-overflow pipe under the drilling platform through the drainage pipe 9, and the mud is quickly recovered.

[0038] The utility model has the following advantages: 1, mud preparation material is saved, according to the comprehensive mud cost of xinjiang shunbei block 10000 / square, the drilling in service of construction one well is expected to be thirty times, and mud is sprayed special tripping average 8 times, saves mud about 8 square each time, and well can save mud material cost 640 about. 2, can prevent personnel from being splashed by hot mud and personnel drilling platform slip risk. 3, reduce the health standardization non-productive labor, save manpower and material resources and the working risk of climbing operation. 4, reduce the pressure of drilling production environmental protection. 5, improve the special tripping time efficiency, save three hours each time, according to the average drilling rig daily fee of xinjiang work area 160000 / yuan, each well can save time efficiency 1 day, and it is expected to save cost 160000 yuan. 5, reduce the mud loss of special tripping, can help the on-duty worker to accurately measure the grouting and discharge volume, can find the tripping overflow in time, and improve the well control safety factor. 6, the existing 2600 domestic drilling teams, seventy percent of three big companies, thirty percent of private well teams, if popularization will change the working environment of domestic drilling workers today.

[0039] The above is only the preferred implementation way of the utility model, and is not used for limiting the utility model, and the utility model can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A gas-tight negative pressure blowout preventer comprising a sleeve body (1), characterized in that, Also include locking cylinder assembly (2), the sleeve body (1) is a split barrel type structure, including the first half sleeve and the second half sleeve, the first half sleeve and the second half sleeve are connected by a plurality of locking cylinder assembly (2); The upper end and the lower end of the inside of the sleeve body (1) are each provided with a circular ring air tire (3), the sleeve body (1) is provided with a negative pressure air inlet and a liquid outlet on the barrel wall, the liquid outlet is provided with a negative pressure liquid discharge device (6), the negative pressure air inlet and the liquid outlet are located between the two circular ring air tires (3), and the negative pressure air inlet is located above the liquid outlet; The outer wall of the sleeve body (1) is provided with an air inlet pipe (4), the air inlet pipe (4) is communicated with the two circular ring air tires (3), the air inlet pipe (4) is used for connecting the gas source, and the circular ring air tire (3) is supplied with air by the gas source, and the air inlet pipe (4) is connected with a switch valve (5).

2. The gas-tight negative pressure blowout preventer according to claim 1, characterized in that, The switch valve (5) is connected with a pressure reducing valve (7) through a pipeline, and the pressure reducing valve (7) is connected with the gas source through a pipeline.

3. The gas-tight negative pressure blowout preventer of claim 1, wherein, The negative pressure air inlet is provided with a negative pressure air inlet pipe (8), the negative pressure air inlet pipe (8) is an L-shaped pipe, the negative pressure air inlet pipe (8) includes a vertical pipe part and a horizontal pipe part, and the horizontal pipe part is located at the upper end of the vertical pipe part, the vertical pipe part of the negative pressure air inlet pipe (8) is located in the sleeve body (1), and the horizontal pipe part of the negative pressure air inlet pipe (8) passes through the negative pressure air inlet.

4. The gas-tight negative pressure blowout preventer of claim 1, wherein, The negative pressure liquid discharge device (6) is a negative pressure rotating nozzle or a negative pressure liquid discharge pump, the liquid inlet end of the negative pressure liquid discharge device (6) is connected with the liquid outlet, and the liquid outlet end is connected with a liquid discharge pipe (9).

5. The gas-tight, negative pressure anti-spray device of claim 1, wherein, Each of the two butt joints of the first half sleeve and the second half sleeve is provided with a group of locking cylinder assembly (2), each group of locking cylinder assembly (2) has a plurality of locking cylinder assembly (2), and the plurality of locking cylinder assembly (2) is sequentially arranged along the axial direction of the sleeve body (1).

6. The gas-tight, negative pressure anti-spray device according to claim 5, characterized in that The locking cylinder assembly (2) includes a first mounting plate (201), a locking cylinder (202) and a second mounting plate (203), the first mounting plate (201) and the second mounting plate (203) are fixedly connected with the first half sleeve and the second half sleeve respectively, the locking cylinder (202) is horizontally installed on the first mounting plate (201), and the piston rod of the locking cylinder assembly (2) is connected with the second mounting plate (203).

7. The gas-tight negative pressure anti-spray device according to claim 6, characterized in that The first mounting plate (201) includes a first arc plate part and a first straight plate part, the first arc plate part is connected with the outer wall of the first half sleeve, and the locking cylinder (202) is horizontally installed on the first straight plate part.

8. The gas-tight, negative pressure anti-spray device according to claim 7, characterized in that The second mounting plate (203) includes a second arc plate part and a second straight plate part, the second arc plate part is connected with the outer wall of the second half sleeve, when the first half sleeve and the second half sleeve are oppositely arranged, the first straight plate part and the second straight plate part are parallel to each other, and the piston rod of the locking cylinder (202) is connected with the second straight plate part through bolts.

9. The gas-tight negative pressure anti-spray device according to claim 5, characterized in that, The locking cylinder assembly (2) comprises a first mounting plate (201), a locking cylinder (202), a second mounting plate (203) and a locking block (204), the first mounting plate (201) comprises a first arc-shaped plate part and a first straight plate part, the first arc-shaped plate part is connected with the outer wall of the first half sleeve, the locking cylinder (202) is horizontally installed on the first straight plate part; the second mounting plate (203) comprises a second arc-shaped plate part and a second straight plate part, the second arc-shaped plate part is connected with the outer wall of the second half sleeve, when the first half sleeve and the second half sleeve are oppositely arranged, the first straight plate part and the second straight plate part are parallel to each other; the locking block (204) is arranged on the top of the piston rod of the locking cylinder (202), an opening is arranged on the second straight plate part, the locking block (204) comprises a locking part which cannot pass through the opening, and the piston rod of the locking cylinder (202) can pass through the opening.

10. The gas-tight, negative pressure anti-spray device of claim 9, wherein, The locking block (204) further comprises a screw rod part which can pass through the opening, a threaded hole is arranged on the top end of the piston rod of the locking cylinder (202), and the locking block (204) is installed on the piston rod of the locking cylinder (202) through the screw rod part.

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