CN111075968A

CN111075968A - Safe pressure tank

Info

Publication number: CN111075968A
Application number: CN201911097229.0A
Authority: CN
Inventors: 蒋红春
Original assignee: Individual
Current assignee: Jiangsu Yongda Pressure Vessel Manufacturing Co ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-04-28
Anticipated expiration: 2039-11-11
Also published as: CN111075968B

Abstract

The invention discloses a safety pressure tank, which comprises: the gas-liquid separation device comprises a tank body, a plug cover and a tank body cover, wherein the plug cover is plugged at the top of the tank body, the tank body cover is covered at the top of the tank body outside the plug cover, a valve core and a corresponding gas channel are arranged in the plug cover, a disc pressing plate is arranged at the bottom of the tank body cover, the corresponding gas channel is arranged in the tank body cover, and a gas channel which enables the plug cover to be communicated with the gas channel of the tank body cover is arranged; when the pressure in the tank body rises, the valve core can be moved away, so that the gas flows into the tank body cover, the disc pressing plate can move downwards to press the top of the plug cover tightly, when the pressure in the tank body is close to a dangerous value, the valve core can open an internal channel of the tank body, so that the gas in the tank body is discharged, the pressure is relieved, and the internal channel of the valve core is closed after the pressure is relieved. The invention ensures that the pressure in the tank body is always in a safe range and can be automatically decompressed when approaching a dangerous value, and the internal channel of the valve core is closed after decompression, so that the tank body is continuously at high pressure to ensure the microwave digestion effect.

Description

Safe pressure tank

Technical Field

The invention relates to the field of pressure vessels, in particular to a pressure tank used in a microwave digestion technology.

Background

The microwave digestion technology is to heat the reagent and the sample in a closed container by utilizing the penetrability and the activated reaction capability of the microwave, so that the pressure in the sample preparation container is increased, the reaction temperature is increased, the reaction rate is greatly increased, and the time for preparing the sample is shortened. The microwave digestion process of the analysis sample is to place the analysis sample and the reagent in a closed container and then carry out microwave heating in a special microwave digestion instrument. In the microwave heating process, a chemical reaction between a sample and a reagent in a closed container can quickly generate high temperature and high pressure, generally speaking, the higher the temperature and the pressure in the closed container are, the better the digestion effect of the sample is, but the high temperature and the high pressure are prone to bringing about explosion risks, so that based on safety considerations, it is necessary to release the pressure in the closed container when the pressure reaches a certain degree so as to avoid the explosion risks.

Disclosure of Invention

The invention aims to provide a safety pressure tank to ensure that pressure in the tank can be released when the pressure reaches a certain degree.

The technical scheme adopted by the invention for solving the technical problems is as follows: a safety pressure tank, comprising:

the bottom of the tank body is closed, the top of the tank body is opened, the inner wall of the opening end is a conical surface, and the conical surface is a conical surface with the diameter gradually reduced from outside to inside along the axial direction; a sixth gas channel is also arranged in the opening end of the tank body, one end of the sixth gas channel is communicated to the conical surface, and the other end of the sixth gas channel is communicated to the end surface of the opening end of the tank body;

the periphery of the lower part of the plug cover is conical, and the conical shape is matched with the conical surface; the plug cover is internally provided with a valve cavity and a spherical valve core positioned in the valve cavity; the valve cavity comprises a lower cavity body which is positioned at the bottom and is hemispherical, an upper cavity body which is positioned at the top and is hemispherical, and a middle cavity body which is positioned between the lower cavity body and the upper cavity body and is cylindrical, wherein the inner diameters of the lower cavity body and the upper cavity body are matched with the outer diameter of the valve core and can just contain the valve core, a first gas channel communicated with the bottom surface of the plug cover is arranged at the bottom of the lower cavity body, a second gas channel communicated with the top surface of the plug cover is arranged at the top of the upper cavity body, a third gas channel communicated with the side surface of the plug cover is arranged on the side surface of the middle cavity body, the first gas channel and the upper cavity body are also communicated through a fourth gas channel, one end of the fourth gas channel is communicated with the side wall of the first gas channel, and the other end of the fourth gas channel is communicated with the; the valve core is provided with a first spring and a spring supporting plate, the spring supporting plate is transversely fixed in the second gas channel, the middle part of the spring supporting plate is provided with a through hole for gas to pass through, the first spring is positioned between the spring supporting plate and the valve core, two ends of the first spring are respectively fixedly connected with the spring supporting plate and the valve core, when the first spring is in an initial state, the valve core is positioned in the lower cavity, a valve core gas hole opening and closing component and an opening and closing component accommodating cavity are arranged in the valve core, the valve core gas hole penetrates through the valve core from the center along the height direction, the opening and closing component accommodating cavity is vertically crossed in the middle of the valve core gas hole, one end, close to the third gas channel, of the opening and closing component accommodating cavity is closed, one end, far away from the third gas channel, is communicated with a fifth gas channel, the fifth, when the valve core is completely accommodated in the upper cavity, the fifth gas channel is communicated with the fourth gas channel, the valve core air hole opening and closing assembly comprises a valve core pin and a second spring, the valve core pin is arranged in the accommodating cavity of the opening and closing assembly and can move freely, a valve core air hole penetrating through the valve core pin in the radial direction is formed in the middle of the valve core pin, the second spring is positioned between the valve core pin and the closed end of the accommodating cavity of the opening and closing assembly, and when the second spring is in an initial state, the valve core pin is positioned at a position where the valve core air hole and the valve core air hole are mutually staggered;

the tank body cover can be stably covered on the top of the tank body, and is provided with an exhaust hole penetrating through the tank body cover; the tank cover is provided with a seventh gas channel, a disc-shaped gas cavity, a plurality of gas rods and a disc pressing plate; the seventh gas channel is L-shaped and positioned beside the inner part of the tank cover and comprises a vertical section and a horizontal section, wherein the vertical section is communicated to the lower surface of the tank cover and corresponds to the sixth gas channel of the tank body in position; the disc-shaped gas cavity is positioned in the center inside the tank cover and is communicated with the tail end of the horizontal section of the seventh gas channel; each gas rod is uniformly arranged below the disc-shaped gas cavity and is vertical to the disc-shaped gas cavity, each gas rod comprises a cylinder barrel, a piston and a piston rod, the cylinder barrel is communicated with the disc-shaped gas cavity, the piston is movably arranged in the cylinder barrel and keeps sealing with the inner wall of the cylinder barrel, and the piston rod is fixed below the piston and extends out of the bottom of the cylinder barrel; the disc pressing plate is horizontally fixed at the bottom of each piston rod;

when the plug cover is completely plugged at the opening end of the tank body and the tank body cover is simultaneously covered on the top of the tank body, the third gas channel and the sixth gas channel are in closed connection and are communicated with each other, the sixth gas channel and the seventh gas channel are in closed connection and are communicated with each other, and the moving stroke of the disc pressing plate can be abutted to the upper surface of the plug cover.

Further, the stiffness coefficient of the first spring satisfies: when the air pressure in the tank body is greater than or equal to 1.2 standard atmospheric pressures, the valve core can move to the upper cavity and is completely accommodated in the upper cavity; the stiffness coefficient of the second spring satisfies: when the air pressure of the fifth air channel is 0.8 times of the maximum bearing pressure of the tank body, the valve core pin can move to a position where the valve core pin air hole is communicated with the valve core air hole.

Further, the taper of the conical surface of the opening end of the tank body is 1: 6; the taper of the lower part of the plug cover is also 1: 6.

Furthermore, a plurality of tension springs are uniformly distributed above the disc pressing plate, one ends of the tension springs are fixedly connected with the disc pressing plate, and the other ends of the tension springs are fixedly connected with the bottom surface of the tank cover.

Furthermore, the plug cover is made of rubber materials.

Further, a cylindrical groove is arranged at the position of the sixth gas channel on the end surface of the tank body, and the inner diameter of the cylindrical groove is larger than the caliber of the sixth gas channel; the lower surface of the tank body cover is provided with a cylindrical boss at the position of the seventh gas channel, and the size of the cylindrical boss is matched with that of the cylindrical groove and can be just embedded into the cylindrical groove.

Furthermore, the lower surface of the tank cover is provided with a disc pressing plate accommodating cavity for accommodating a disc pressing plate.

Further, the tank cover and the tank body are fixed by a fastener arranged on the outer wall of the tank body.

The invention is mainly used for holding analysis samples and reagents during microwave digestion, and the working principle is as follows: when the device is used, an analysis sample and a reagent are placed in the tank body, the plug cover is placed at the opening end of the tank body, then the tank body cover is covered on the top of the tank body, the tank body cover is firmly fixed through the fastener, after the tank body cover is covered, the third gas channel is communicated with the sixth gas channel, the sixth gas channel is communicated with the seventh gas channel, and then the pressure tank is placed in a microwave digestion instrument for microwave digestion; when the air pressure in the tank body rises, the air enters the first air channel and then pushes the valve core to move upwards, so that the air can enter the third air channel through the valve cavity and then enters the disc-shaped air cavity through the sixth air channel and the seventh air channel, the air entering the disc-shaped air cavity can enter the cylinder barrel of the air rod and further push the piston and the piston rod to move downwards, so that the disc pressing plate is driven to move downwards until the piston and the piston rod are tightly pressed above the plug cover, the plug cover is tightly pressed at the opening end of the tank body, and the larger the air pressure in the tank body is, the larger the acting force applied by the disc pressing plate to the plug cover is, and the tighter the plug cover is pressed; because the valve core can be completely accommodated in the upper cavity when the air pressure in the tank body is more than or equal to 1.2 standard atmospheric pressures, namely the fourth air channel and the fifth air channel can be communicated (namely, the air pressure in the fifth channel is consistent with the air pressure in the tank body), if the air pressure in the tank body continues to rise, when the dangerous degree is reached (namely, the air pressure is more than 0.8 time of the maximum bearing pressure of the tank body), the air pressure in the fifth air channel can push the valve core pin to move to the position where the valve core pin air hole is communicated with the valve core air hole, so that the valve core air hole is opened, the air pressure in the tank body can be released outwards after passing through the valve core air hole and the second air channel, the released air can be exhausted from the exhaust hole of the tank body cover, and once the pressure in the tank body is released, the pressure in the fifth air channel can be reduced, the valve core pin can move to the position where the valve core pin air hole and the valve core air hole are mutually staggered under the, thereby ensuring that the pressure in the tank body can continuously keep high pressure under the safe condition.

The invention has the beneficial effects that: (1) when the air pressure in the tank body rises, the plug cover can be tightly pressed at the opening end of the tank body through the disc pressing plate, and the plug cover is pressed more tightly when the air pressure in the tank body is larger, so that the situation that the plug cover is jacked up when the air pressure in the tank body is gradually increased is well avoided; (2) when the internal atmospheric pressure of jar reached more dangerous degree (being greater than the 0.8 times of jar body maximum bearing pressure promptly), atmospheric pressure can promote the case round pin and remove, so that the case gas pocket is no longer separated to the case round pin, thereby realize the purpose of pressure release, and the case round pin can be promoted to the normal position by the second spring after the pressure release, the case gas pocket is separated once more, thereby guaranteed that the internal pressure of jar is in safety range all the time, in case exceed standard just can automatic pressure release, and can also maintain the internal pressure of jar and continuously be in high-pressure state (be less than the 0.8 times of the 1 biggest bearing pressure of jar body), thereby guarantee that good microwave clears up the effect.

Drawings

FIG. 1 is a schematic exploded view of the safety pressure tank of the present invention;

FIG. 2 is a schematic view of the safety pressure tank of the present invention assembled;

FIG. 3 is a schematic view of the construction of the valve cavity, valve core and its vicinity in the plug cover of the present invention;

FIG. 4 is a schematic view of the valve cartridge of FIG. 3 as it moves into the upper chamber;

FIG. 5 is a schematic view of the valve cartridge of FIG. 3 with the cartridge removed;

FIG. 6 is a schematic diagram of the valve cartridge of FIG. 3;

FIG. 7 is a top view of the valve cartridge of FIG. 6;

FIG. 8 is an enlarged view at A in FIG. 1;

fig. 9 is a schematic view of the piston rod of fig. 8 pushing the disk platen downward.

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1-9, the safety pressure tank provided by the invention comprises a tank body 1, a plug 2 and a tank body cover 3.

Referring to fig. 1, the bottom of the tank body 1 is closed, the top of the tank body is open, the inner wall of the open end is a conical surface 11, and the conical surface 11 is a conical surface with a diameter gradually reduced from outside to inside along the axial direction; a sixth gas channel 12 is further arranged inside the opening end of the tank body 1, one end of the sixth gas channel 12 is communicated with the conical surface 11, and the other end of the sixth gas channel 12 is communicated with the end surface of the opening end of the tank body 1;

as shown in fig. 1, the periphery of the lower part of the plug cover 2 is tapered, and the taper is matched with the tapered surface 11; the plug cover 2 is internally provided with a valve cavity 21 and a spherical valve core 22 positioned in the valve cavity 21; referring to fig. 3-5, the valve cavity 21 includes a lower cavity 211, an upper cavity 212 and a middle cavity 213, wherein the lower cavity 211, the upper cavity 212 and the middle cavity 213 are located at the bottom and are hemispherical, the inner diameters of the lower cavity 211, the upper cavity 212 and the middle cavity 213 are the same and are matched with the outer diameter of the valve core 22 (i.e., the inner diameters of the three cavities are substantially the same as the outer diameter of the valve core 22) and just can accommodate the valve core 22, the bottom of the lower cavity 211 is provided with a first gas passage 23 communicated with the bottom surface of the plug cover 2, the top of the upper cavity 212 is provided with a second gas passage 24 communicated with the top surface of the plug cover 2, the side of the middle cavity 213 is provided with a third gas passage 25 communicated with the tapered side surface of the plug cover 2, and the first gas passage 23 and the upper cavity 212 are further communicated with each other through a fourth gas passage 26, one end of the fourth gas channel 26 is communicated with the side wall of the first gas channel 23, and the other end is communicated with the upper part of the upper cavity 212 at the side far away from the third gas channel 25; referring to fig. 3 and 4, the valve core 22 is configured with a first spring 27 and a spring support plate 28, the spring support plate 28 is transversely fixed in the second gas channel 24, a through hole 281 for gas to pass through is formed in the middle of the spring support plate 28, the first spring 27 is located between the spring support plate 28 and the valve core 22, two ends of the first spring 27 are respectively and fixedly connected with the spring support plate 28 and the valve core 22, and when the first spring 27 is in an initial state, the valve core 22 is located in the lower cavity 211 (see fig. 3); referring to fig. 6, a valve core air hole 221, a valve core air hole opening and closing assembly 222 and an opening and closing assembly accommodating cavity 223 are arranged in the valve core 22, the valve core air hole 221 penetrates through the valve core 22 from the center along the height direction, the opening and closing assembly accommodating cavity 223 perpendicularly crosses the middle of the valve core air hole 221 (i.e., the two are communicated with each other and cross), one end of the opening and closing assembly accommodating cavity 223 close to the third gas channel 25 is closed, one end far away from the third gas channel 25 is communicated with the fifth gas channel 224, the fifth gas channel 224 is obliquely arranged and the top of the fifth gas channel 224 is communicated with the obliquely upper side of the valve core 22 far away from the third gas channel 25, when the valve core 22 is completely accommodated in the upper cavity 212, the fifth gas channel 224 is hermetically connected with the fourth gas channel 26 and is communicated with each other (see fig. 4), the valve core air hole opening and closing assembly 222 comprises, the valve core pin 2221 is disposed in the opening/closing member receiving cavity 223 and can move freely, and the outer diameter of the valve core pin 2221 is consistent with the inner diameter of the opening/closing member receiving cavity 223 to ensure the sealing performance, the middle part of the valve core pin 2221 is provided with a valve core pin air hole 22211 penetrating through the valve core pin 2221 in the radial direction, the second spring 2222 is located between the valve core pin 2221 and the closed end of the opening/closing member receiving cavity 223, and when the second spring 2222 is in the initial state, the valve core pin 2221 is located at a position where the valve core pin air hole 22211 and the valve core air hole 221 are staggered with each other (see fig;

referring to fig. 1 and 2, the can body cover 3 is stably covered on the top of the can body 1, and the can body cover 3 is provided with a vent hole 38 penetrating therethrough; the tank cover 3 is also provided with a seventh gas channel 31, a disc-shaped gas cavity 32, a plurality of gas rods 33 and a disc pressing plate 34; the seventh gas channel 31 is L-shaped and located beside the inner part of the tank cover 3, and comprises a vertical section 311 and a horizontal section 312, wherein the vertical section 311 is communicated with the lower surface of the tank cover 3 and corresponds to the sixth gas channel 12 of the tank 1; the disc-shaped gas cavity 32 is positioned in the center of the inner part of the tank cover 3 and is communicated with the tail end of the horizontal section 312 of the seventh gas channel 31; the gas rods 33 are uniformly arranged below the disc-shaped gas cavity 32 and are vertical to the disc-shaped gas cavity 32, as shown in fig. 8 and 9, each gas rod 33 comprises a cylinder 331, a piston 332 and a piston rod 333, the cylinder 331 is communicated with the disc-shaped gas cavity 32, the piston 332 is movably arranged in the cylinder 331 and keeps sealed with the inner wall of the cylinder 331, and the piston rod 333 is fixed below the piston 332 and extends out of the bottom of the cylinder 331; the disc pressing plate 34 is horizontally fixed at the bottom of each piston rod 333;

referring to fig. 2, when the plug 2 is completely plugged at the open end of the can body 1 and the can body cover 3 is simultaneously covered on the top of the can body 1, the third gas channel 25 and the sixth gas channel 12 are hermetically connected and communicated with each other, the sixth gas channel 12 and the seventh gas channel 31 are also hermetically connected and communicated with each other, and the moving stroke of the disc pressing plate 34 can be abutted against the upper surface of the plug 2.

Explanation: the initial state of the first spring 27 in the above description means: in the state shown in fig. 3, when the air pressure around the spool 22 is the normal atmospheric pressure, the first spring 27 is stretched to the longest state by the spool 22. The second spring 2222 in the initial state refers to: in the state shown in fig. 6, when the gas pressure in the fifth gas passage 224 is the normal atmospheric pressure, the spool pin 2221 is pushed to the farthest end by the second spring 2222, and the second spring 2222 is in the above-described state. Since the spool pin 2221 and the spool air hole 221 are perpendicular to each other, the movement of the spool pin 2221 is not dependent on the air pressure in the spool air hole 221, but is only affected by the magnitude of the air pressure in the fifth passage 224.

Preferably, the stiffness coefficient of the first spring 27 satisfies: as long as the air pressure in the tank 1 is greater than 1 standard atmospheric pressure, the valve core 22 moves upward, and when the air pressure in the tank 1 is greater than or equal to 1.2 standard atmospheric pressures, the valve core 22 moves into the upper cavity 212 and is completely contained in the upper cavity 212; in the design, the force applied to the valve element 22 by the first spring 27 in the initial state is a pulling force, and the magnitude of the pulling force is equal to the weight of the valve element 22, so that even if the valve element 22 blocks the lower cavity 211, once the air pressure in the tank 1 is greater than 1 standard air pressure, the valve element 22 moves upward to open the lower cavity 211, so that the air can flow into the tank cover 3, and the design aims to: as long as the air pressure in the tank 1 rises, the valve core 22 moves upwards, and the air can enter the disc-shaped air cavity 32 of the tank cover 3, so that the disc pressing plate 34 can move downwards to press the plug cover 2, and the plug cover 2 is prevented from being jacked up.

Preferably, the stiffness coefficient of the second spring 2222 satisfies: when the gas pressure of the fifth gas channel 224 is greater than 0.8 times the maximum bearing pressure of the tank 1, the valve core pin 2221 compresses the second spring 2222 and moves to a position where the valve core pin air hole 22211 is communicated with the valve core air hole 221, so that the valve core air hole 221 is unblocked to play a role of exhausting gas.

Preferably, the taper of the conical surface 11 at the opening end of the tank body 1 is 1: 6; the taper of the lower part of the plug cover 2 is also 1: 6. The conical surface design can guarantee that when the gag 2 is pushed down, can play spacing effect to the gag 2, avoids the gag 2 to be impressed in jar body 1.

Preferably, referring to fig. 1, 8 and 9, a plurality of tension springs 35 are uniformly distributed above the disc pressing plate 34, one end of each tension spring 35 is fixedly connected with the disc pressing plate 34, and the other end of each tension spring 35 is fixedly connected with the bottom surface of the tank cover 3. The lower surface of the body cover 3 is provided with a disc pressing plate accommodating chamber 37 for accommodating the disc pressing plate 34 therein. The tension spring 35 can pull the disk presser 34 back into the disk presser receiving chamber 37 when the air lever 33 loses its pushing force.

Preferably, the plug 2 is made of rubber material, such as perfluororubber.

Preferably, referring to fig. 1, a cylindrical groove 13 is arranged on the end surface of the tank 1 at the position of the sixth gas channel 12, and the inner diameter of the cylindrical groove 13 is larger than the caliber of the sixth gas channel 12; a cylindrical boss 36 is arranged on the lower surface of the tank cover 3 at the position of the seventh gas channel 31, and the size of the cylindrical boss 36 is matched with that of the cylindrical groove 13 and can be just embedded into the cylindrical groove 13. The cylindrical recess 13 and the cylindrical boss 36 are designed for the purpose of: when the tank cover 3 is covered on the tank 1, the positioning function can be achieved to ensure that the sixth gas channel 12 and the seventh gas channel 31 are communicated with each other after the cover is arranged.

Certainly, in order to guarantee that the plug 2 covers the tank body 1 and then the third gas channel 25 can be communicated with the sixth gas channel 12, the limiting structures which are matched with each other can be arranged on the periphery of the plug 2 and the inner wall of the opening end of the tank body 1 to limit the opening, if a limiting groove and a limiting strip are matched with each other, the plug 2 can only be plugged into the opening end of the tank body 1 along the unique state, and the third gas channel 25 can be communicated with the sixth gas channel 12 after the plug is plugged into the opening end of the tank body 1. The design of the limiting groove and the limiting strip belongs to the conventional technology and is not shown in the figure.

Preferably, as shown in fig. 5, the inner wall of the middle cavity 213 on the side away from the third gas channel 25 is provided with a vertically extending guide strip 214, and as shown in fig. 7, on the side of the valve core 22 away from the third gas channel 25 is provided with a guide groove 225 which is engaged with the guide strip 214. The cooperation of the guide strips 214 and the guide grooves 225 can limit the moving direction of the valve core 22, and prevent the valve core 22 from rotating in the valve cavity 21.

Preferably, referring to fig. 1, the fixing between the can body cover 3 and the can body 1 is realized by a fastener 4 mounted on the outer wall of the can body 1. The fastener 4 can adopt a common fitting in life (often used in a plurality of devices needing to ensure that the cover and the cylinder are fixed, such as a dust collector), and comprises a pressing handle and a hanging buckle, when the fastener is used, the hanging buckle is hung on a flange around the tank cover 3, and then the pressing handle is pressed down with force, so that the hanging buckle compresses the tank cover 3, and the tank cover is firmly covered on the tank body 1.

The safe pressure tank is mainly used for containing analysis samples and reagents during microwave digestion, and has the working principle that: when the device is used, an analysis sample and a reagent are placed in the tank body 1, the plug cover 2 is placed at the opening end of the tank body 1, then the tank body cover 3 is covered on the top of the tank body 1, the tank body cover 3 is firmly fixed through the fastener 4, after the cover is closed, the third gas channel 25 is communicated with the sixth gas channel 12, the sixth gas channel 12 is communicated with the seventh gas channel 31, and then the pressure tank is placed in a microwave digestion instrument for microwave digestion; when the air pressure in the tank body 1 rises, after the air enters the first air passage 23, the valve core 22 is pushed to move upwards, so that the air can enter the third air passage 25 through the valve cavity 21, and then enters the disc-shaped air cavity 32 through the sixth air passage 12 and the seventh air passage 31, the air entering the disc-shaped air cavity 32 can enter the cylinder 331 of each air rod 33, so that the piston 332 and the piston rod 333 of each air rod 33 are pushed to move downwards, the disc pressing plate 34 is driven to move downwards until the disc pressing plate abuts against the upper part of the plug cover 2, the plug cover 2 is tightly pressed at the opening end of the tank body 1, and the larger the air pressure in the tank body 1 is, the larger the acting force of the disc pressing plate 34 on the plug cover 2 is, and the more tightly the plug cover 2 is pressed; since the valve core 22 is completely accommodated in the upper cavity 212 when the gas pressure in the tank 1 is greater than or equal to 1.2 atm (i.e. the gas pressure in the fifth channel 224 is the same as the gas pressure in the tank 1), if the gas pressure in the tank 1 continues to rise, when the gas pressure reaches a dangerous level (i.e. greater than 0.8 times the maximum pressure of the tank 1), the gas pressure in the fifth channel 224 pushes the valve core pin 2221 to move to a position where the valve core pin air hole 22211 is communicated with the valve core air hole 221, so as to open the valve core air hole 221, so that the gas pressure in the tank 1 can be released outwards through the valve core air hole 221 and the second gas channel 24, and the released gas can be discharged from the air discharge hole 38 of the tank cover 3, and once the pressure in the tank 1 is released, the pressure in the fifth gas channel 224 can be reduced, the spool pin 2221 is pushed by the second spring 2222 to move to a position where the spool pin air hole 22211 and the spool air hole 221 are staggered with each other, thereby ensuring that the pressure in the tank 1 can continuously maintain high pressure under safe conditions.

In the invention, when the air pressure in the tank body 1 rises, the plug cover 2 can be tightly pressed at the opening end of the tank body 1 through the disc pressing plate 34, and the plug cover 2 is pressed more tightly when the air pressure in the tank body 1 is larger, so that the situation that the plug cover 2 is jacked up when the air pressure in the tank body 1 is gradually increased is well avoided. In addition, when the air pressure in the tank body 1 reaches a dangerous degree (i.e. greater than 0.8 times of the maximum bearing pressure of the tank body 1), the air pressure can push the valve core pin 2221 to move, so that the valve core pin 2221 does not block the valve core air hole 221 any more, thereby achieving the purpose of pressure relief, and after the pressure relief, the valve core pin 2221 is pushed to the original position by the second spring 2222, and the valve core air hole 221 is blocked again, thereby ensuring that the pressure in the tank body 1 is always within a safe range, and the pressure relief can be performed automatically once the pressure exceeds a standard, on the other hand, the pressure in the tank body 1 can be automatically closed after the redundant pressure is relieved, and ensuring that the pressure in the tank body 1 can be continuously in a.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety pressure tank, comprising:

the tank body is characterized in that the bottom of the tank body (1) is closed, the top of the tank body is open, the inner wall of the open end is a conical surface (11), and the conical surface (11) is a conical surface with the diameter gradually reduced from outside to inside along the axial direction; a sixth gas channel (12) is also arranged in the opening end of the tank body (1), one end of the sixth gas channel (12) is communicated to the conical surface (11), and the other end is communicated to the end surface of the opening end of the tank body (1);

the periphery of the lower part of the plug cover (2) is conical, and the conical shape is matched with the conical surface (11); a valve cavity (21) and a spherical valve core (22) positioned in the valve cavity (21) are arranged in the plug cover (2); the valve cavity (21) comprises a lower cavity (211) which is positioned at the bottom and is hemispherical, an upper cavity (212) which is positioned at the top and is hemispherical, and a middle cavity (213) which is positioned between the lower cavity (211) and the upper cavity (212) and is cylindrical, wherein the inner diameters of the lower cavity (211) and the upper cavity (212) are matched with the outer diameter of the valve core (22) and just can contain the valve core (22) to be arranged in the middle cavity, the bottom of the lower cavity (211) is provided with a first gas channel (23) communicated with the bottom surface of the plug cover (2), the top of the upper cavity (212) is provided with a second gas channel (24) communicated with the top surface of the plug cover (2), the side surface of the middle cavity (213) is provided with a third gas channel (25) communicated with the side surface of the plug cover (2), and the first gas channel (23) and the upper cavity (212) are also communicated through a fourth gas channel (26), one end of the fourth gas channel (26) is communicated with the side wall of the first gas channel (23), and the other end of the fourth gas channel is communicated with the upper oblique side of the upper cavity (212) far away from one side of the third gas channel (25); the valve core (22) is provided with a first spring (27) and a spring supporting plate (28), the spring supporting plate (28) is transversely fixed in the second gas channel (24), the middle part of the spring supporting plate (28) is provided with a through hole (281) for gas to pass through, the first spring (27) is positioned between the spring supporting plate (28) and the valve core (22), two ends of the first spring (27) are respectively and fixedly connected with the spring supporting plate (28) and the valve core (22), when the first spring (27) is in an initial state, the valve core (22) is positioned in the lower cavity (211), a valve core gas hole (221), a valve core gas hole opening and closing component (222) and an opening and closing component accommodating cavity (223) are arranged in the valve core (22), the valve core gas hole (221) penetrates through the valve core (22) from the center along the height direction, and the opening and closing component accommodating cavity (223) vertically crosses the middle of the valve core, the end of the opening and closing assembly accommodating cavity (223) close to the third gas channel (25) is closed, the end far away from the third gas channel (25) is communicated with a fifth gas channel (224), the fifth gas channel (224) is obliquely arranged, the top of the fifth gas channel is communicated to the obliquely upper side of one side of the valve core (22) far away from the third gas channel (25), when the valve core (22) is completely accommodated in the upper cavity body (212), the fifth gas channel (224) is communicated with the fourth gas channel (26), the valve core air hole opening and closing assembly (222) comprises a valve core pin (2221) and a second spring (2222), the valve core pin (2221) is arranged in the opening and closing assembly accommodating cavity (223) and can move freely, a valve core air hole (22211) which radially penetrates through the valve core pin (2221) is formed in the middle of the valve core pin (2221), and the second spring (2222) is positioned between the valve core pin (2221) and the closed end of the opening and closing assembly accommodating cavity, when the second spring (2222) is in an initial state, the valve core pin (2221) is in a position where the valve core pin air hole (22211) and the valve core air hole (221) are staggered with each other;

the tank body cover (3) can be stably covered on the top of the tank body (1), and the tank body cover (3) is provided with an exhaust hole (38) penetrating through the tank body cover; the tank cover (3) is provided with a seventh gas channel (31), a disc-shaped gas cavity (32), a plurality of gas rods (33) and a disc pressing plate (34); the seventh gas channel (31) is L-shaped and positioned beside the inner part of the tank cover (3), and comprises a vertical section (311) and a horizontal section (312), wherein the vertical section (311) is communicated to the lower surface of the tank cover (3) and corresponds to the sixth gas channel (12) of the tank (1); the disc-shaped gas cavity (32) is positioned in the center inside the tank cover (3) and is communicated with the tail end of the horizontal section (312) of the seventh gas channel (31); each gas rod (33) is uniformly arranged below the disc-shaped gas cavity (32) and is vertical to the disc-shaped gas cavity (32), each gas rod (33) comprises a cylinder barrel (331), a piston (332) and a piston rod (333), the cylinder barrel (331) is communicated with the disc-shaped gas cavity (32), the piston (332) is movably arranged in the cylinder barrel (331) and is sealed with the inner wall of the cylinder barrel (331), and the piston rod (333) is fixed below the piston (332) and extends out of the bottom of the cylinder barrel (331); the disc pressing plate (34) is horizontally fixed at the bottom of each piston rod (333);

when the plug cover (2) is completely plugged at the opening end of the tank body (1) and the tank body cover (3) is simultaneously covered on the top of the tank body (1), the third gas channel (25) and the sixth gas channel (12) are in closed connection and are communicated with each other, the sixth gas channel (12) and the seventh gas channel (31) are in closed connection and are communicated with each other, and the moving stroke of the disc pressing plate (34) can be abutted to the upper surface of the plug cover (2).

2. A safety pressure tank according to claim 1, characterized in that the stiffness coefficient of the first spring (27) is such that: as long as the air pressure in the tank body (1) is greater than 1 standard atmospheric pressure, the valve core (22) can move upwards, and when the air pressure in the tank body (1) is greater than or equal to 1.2 standard atmospheric pressures, the valve core (22) can move into the upper cavity (212) and is completely accommodated in the upper cavity (212); the stiffness coefficient of the second spring (2222) satisfies: when the air pressure of the fifth air channel (224) is larger than 0.8 times of the maximum bearing pressure of the tank body (1), the valve core pin (2221) moves to a position where the valve core pin air hole (22211) is communicated with the valve core air hole (221).

3. The safety pressure tank as claimed in claim 1, wherein the taper of the conical surface (11) at the opening end of the tank body (1) is 1: 6; the taper of the lower part of the plug cover (2) is also 1: 6.

4. The safety pressure tank as claimed in claim 1, wherein a plurality of tension springs (35) are uniformly distributed above the disc pressing plate (34), one ends of the tension springs (35) are fixedly connected with the disc pressing plate (34), and the other ends of the tension springs are fixedly connected with the bottom surface of the tank body cover (3).

5. A safety pressure tank according to claim 1, characterized in that the closure (2) is made of rubber.

6. A safety pressure tank according to claim 1, characterized in that a cylindrical groove (13) is provided on the end surface of the tank body (1) at the location of the sixth gas channel (12), the inner diameter of the cylindrical groove (13) being larger than the caliber of the sixth gas channel (12); and a cylindrical boss (36) is arranged on the lower surface of the tank body cover (3) and positioned at the seventh gas channel (31), and the size of the cylindrical boss (36) is matched with that of the cylindrical groove (13) and can be just embedded into the cylindrical groove (13).

7. A safety pressure tank according to claim 1, characterized in that the lower surface of the tank cover (3) is provided with a disc pressure plate receiving chamber (37) for receiving a disc pressure plate (34) therein.

8. The safety pressure tank as claimed in claim 1, characterized in that the inner wall of the side of the central cavity (213) facing away from the third gas channel (25) is provided with a vertically extending guide strip (214), and the side of the valve core (22) facing away from the third gas channel (25) is provided with a guide groove (225) which is engaged with the guide strip (214).

9. A safety pressure tank according to claim 9, characterized in that the fixation between the tank cover (3) and the tank (1) is realized by a fastener (4) mounted on the outer wall of the tank (1).