Sealed breathing device suitable for high-viscosity gas and implementation method of sealed breathing device

Abstract

The invention discloses a sealed breathing device suitable for high-viscosity gas and an implementation method of the sealed breathing device, and belongs to the technical field of breathing valves.The sealed breathing device suitable for the high-viscosity gas comprises a tank body and a connecting shaft, and a connecting pipeline is installed on the tank body; the connecting pipeline is provided with a spring type pilot valve used for inputting or outputting gas, and the two sides of the connecting pipeline are provided with a ball valve used for relieving pressure and a vacuum breaking valve used for guaranteeing that the pressure of the tank body is consistent with the pressure of the outside correspondingly. High-viscosity substances adhered to the valve element can be scraped off by friction generated by the valve element and the valve body, and opening and closing of the ball valve are controlled through the spring type pilot valve and the single-action pneumatic switch, so that the problems of difficulty in maintenance, high failure rate, poor sealing performance and the like caused by adhesion of high-viscosity gas to the valve cover are effectively prevented; and the ball valve can be accurately opened by calculating the opening pressure and selecting a proper spring according to the use condition.

Description

Technical Field

[0001] The present invention relates to the technical field of breathing valves, and in particular to a sealed breathing device suitable for high-viscosity gases and a method for realizing the same. Background Art

[0002] The main structure of a breathing valve includes a valve seat, a valve cover, a protective cover, and two opening and closing devices controlled by vacuum and pressure. The opening and closing devices are composed of a valve flap, a guide rod, a spring, a spring seat, a sealing ring, etc. When the pressure in the tank reaches the rated positive pressure for exhalation, the pressure valve flap opens, and the vapor in the tank is discharged. When the vacuum degree in the tank reaches the rated negative pressure for inhalation, the vacuum valve flap opens, and air enters.

[0003] However, there are still certain defects in existing breathing valves. The breathing valves for high-viscosity gases are easily contaminated during use because they need to be in frequent contact with the medium in the storage tank and the external environment, resulting in difficult maintenance. If the contamination is serious, it may affect the normal operation of the breathing valve and even cause equipment failure. Moreover, in an environment of high-viscosity gases, the failure rate of breathing valves will increase. These failures will not only affect the normal operation of the equipment but also pose a threat to production and safety. At the same time, high-viscosity gases will increase the sealing difficulty of breathing valves, resulting in insufficient sealing performance and thus causing leakage problems. Long-term leakage will not only cause waste of resources but also may pollute the surrounding environment and even trigger serious accidents such as fires and explosions. Therefore, a sealed breathing device suitable for high-viscosity gases and a method for realizing the same are proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a sealed breathing device suitable for high-viscosity gases and a method for realizing the same to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A sealed breathing device suitable for high-viscosity gases, including a tank body, a connecting pipe is connected to the top of the tank body, a spring-loaded pilot valve for controlling the input or output of gas is connected to the connecting pipe, a ball valve for pressure relief and a vacuum-breaking valve for ensuring the pressure consistency between the tank body and the outside are respectively connected to both sides of the connecting pipe, and the spring-loaded pilot valve is located on the adjacent side of the ball valve and the vacuum-breaking valve;

[0006] Wherein, a connecting shaft is fixedly connected to the ball valve, a single-acting pneumatic switch for controlling the opening and closing of the ball valve is installed at one end of the connecting shaft away from the ball valve, two gas pipes are connected to the spring-loaded pilot valve, one of the gas pipes is connected to a gas source, and the spring-loaded pilot valve is connected to the single-acting pneumatic switch through the other gas pipe.

[0007] As a further preferred embodiment of the technical solution: a spring 1 and a piston rod are respectively provided in the spring-type pilot valve, the piston rod is installed at the bottom of the spring 1, a limit block is fixedly connected to the spring-type pilot valve and is located on one side adjacent to the two plates of the piston rod, and an exhaust port is provided on the spring-type pilot valve and is located below another gas pipeline, the spring 1 drives the piston rod to reset through its own elastic potential energy, and the piston rod is changed by different pressures under the action of the limit block to realize the change of the gas path;

[0008] Among them, the top of the spring is fixedly connected to the spring-type pilot valve, the piston rod slides in the spring-type pilot valve, and the limit block is located above a gas pipeline. The above arrangement realizes the entry or output of the gas source through the gas path.

[0009] As a further preferred embodiment of the technical solution: a mold cavity is formed on one side of the connecting pipe adjacent to the spring-type pilot valve, a diaphragm is installed in the mold cavity, and the diaphragm is located below the piston rod.

[0010] As a further preferred embodiment of the present technical solution: the single-acting pneumatic switch comprises a mounting tube, a piston cylinder, a connecting pipe and a limit switch, the mounting tube is connected to the piston cylinder through a connecting pipe, a second spring and a piston shaft are respectively arranged in the mounting tube, the second spring is sleeved on the piston shaft, one end of the piston shaft runs through the piston cylinder, the mounting tube is used to receive the second spring and the piston shaft, and the piston cylinder receives the input air source and the piston shaft extension section, at the same time, the mounting tube and the piston cylinder are connected by the connecting pipe, wherein the limit switch is set to detect the position of the toggle plate to realize opening and closing;

[0011] Among them, one end of the second spring is fixedly connected to the installation cylinder, and the piston shaft slides in the installation cylinder. The above arrangement uses the elastic potential energy of the second spring itself to drive the piston shaft to reset;

[0012] Among them, the spring 2 constitutes a reset mechanism through the piston shaft and the installation cylinder, and the reset mechanism is used to realize that the entire device is restored to a normal pressure state after completing the overpressure relief state.

[0013] As a further preferred embodiment of the technical solution: a toggle plate is installed in the connecting pipe, a sleeve is installed on the piston shaft, the slide rod on the sleeve is supported by the toggle plate, and the sleeve is linked when the piston shaft runs;

[0014] Among them, the toggle plate is provided with a slide groove, the sleeve is fixedly connected with a slide rod, and the slide rod runs through the slide groove. The above arrangement drives the toggle plate to operate by means of the horizontally sliding slide rod, thereby causing the limit switch to change.

[0015] As a further preferred embodiment of the present technical solution: a toothed plate is also fixedly connected to the sleeve, a gear is installed on the top of the connecting shaft, the toothed plate is meshed with the gear, and the toothed plate is linked through the sleeve under the action of the piston shaft, and drives the gear meshed with it, and through the above arrangement, the force of the horizontal operation of the piston shaft is converted into the force of the circumferential operation of the connecting shaft.

[0016] As a further preferred embodiment of the present technical solution: a valve stem and a valve disc are respectively provided in the vacuum breaker valve, the valve disc is installed on the valve stem, the valve stem slides in the vacuum breaker valve, and the valve stem slides vertically in the vacuum breaker valve under the action of the pressure difference, and drives the valve disc supported by it to rise and fall together, and the valve seat of the closed vacuum breaker valve is covered by the valve disc, thereby achieving full sealing of the vacuum breaker valve.

[0017] A method for implementing a sealed breathing device suitable for high-viscosity gas comprises the following steps:

[0018] S1, normal working state;

[0019] A1. Spring 2 and the piston shaft in the reset mechanism are in a compressed state;

[0020] A2. At this time, the limit block in the spring-type pilot valve fits with the upper plate of the piston rod, that is, the piston rod is in the first position;

[0021] A3. Allow the gas source to enter the spring-loaded pilot valve through the gas pipeline on one side, and enter the piston cylinder through the gas pipeline on the other side;

[0022] A4. Since the gas source continuously delivers compressed gas, there is a certain gas pressure in the piston cylinder;

[0023] A5. At the same time, the limit switch on the single-acting pneumatic switch is in the closed state, the ball valve is in the cut-off state, the entire connecting pipe and the tank body are in a sealed state, and work normally;

[0024] S2, overpressure relief state;

[0025] B1. When the pressure in the tank continues to rise, the pressure lifts the piston rod in the spring-type pilot valve, causing the piston rod to move vertically and compress the spring 1 at the top of the valve;

[0026] B2. At this time, since the piston rod moves upward, the air path between the spring-type pilot valve and the piston cylinder is cut off, that is, the limit block in the spring-type pilot valve fits with the lower plate of the piston rod, and the piston rod is in the second position, resulting in a decrease in the air pressure in the piston cylinder;

[0027] B3. The second spring pulls the piston shaft to move rightward. During the compression process, the gas is discharged through the exhaust port, and drives the sleeve installed on the piston shaft to move horizontally. By means of the engagement between the toothed plate and the gear, the connecting shaft rotates, and thus the linkage operation of the ball valve spool is realized through the rotating connecting shaft, making the ball valve in the conducting state. Then, the high-pressure gas in the tank is discharged to the external atmosphere or the external waste treatment device to achieve overpressure relief.

[0028] B4. After discharging the high-pressure gas, the pressure in the tank decreases. The piston rod of the spring-loaded pilot valve returns under the elastic force of the first spring, making the gas path connected. The second spring pulls the piston shaft to move leftward, and the ball valve rotates to the sealed state, returning to the normal working state.

[0029] S3. Vacuum overpressure state.

[0030] C1. When a vacuum overpressure state appears in the tank, due to the pressure difference, the valve disc of the vacuum-breaking valve opens, and thus the external atmosphere enters the connecting pipe to achieve pressure balance. Then the valve disc closes, and the tank turns to the normal pressure state.

[0031] As a further preferred embodiment of this technical solution: in A4, the elastic force of the second spring is F1, and the gas pressure is P1. Among them, the conveyed gas pressure P1 is equal to the elastic force F1 of the second spring.

[0032] In B2, when the air pressure in the piston cylinder decreases, the conveyed gas pressure P1 is less than the elastic force F1 of the second spring.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. During the rotation of the ball valve in the present invention, the friction generated between its spool and the valve body will scrape off the high-viscosity substances adhering to the spool. And the opening and closing of the ball valve are controlled by the spring-loaded pilot valve and the single-acting pneumatic switch, which not only effectively prevents problems such as difficult maintenance, high failure rate, and poor sealing performance caused by the adhesion of high-viscosity gas to the valve cover, but also can achieve the precise opening of the ball valve by calculating the opening pressure and selecting a suitable spring according to the usage situation. Moreover, compared with the sealing method that generally sets a gasket at the bottom of the valve disc, the ball valve can achieve a higher degree of sealing effect.

[0035] 2. The present invention can automatically start the pressure relief operation under overpressure conditions, and automatically return to the normal pressure state after the overpressure relief is completed, thereby effectively improving the automation effect of the device operation and being able to effectively avoid the use of manual labor.

[0036] 3. In the present invention, when the vacuum-breaking valve in the tank is in a vacuum overpressure state, the valve disc of the vacuum-breaking valve is opened through the pressure difference, so that the external atmosphere enters the connecting pipe, thereby achieving the effect of balancing the pressure between the tank and the outside, and further preventing the connecting pipe from being damaged due to excessive negative pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 FIG. 6 is a schematic structural diagram of a sealed breathing device for high-viscosity gases according to the present invention under normal pressure;

[0038] Figure 2 FIG. 10 is a schematic structural diagram of a sealed breathing device for high-viscosity gases according to the present invention under overpressure relief;

[0039] Figure 3 FIG. 14 is a schematic structural diagram of a sealed breathing device for high-viscosity gases according to the present invention under vacuum overpressure;

[0040] Figure 4 A sealed breathing device for high-viscosity gases according to the present invention Figure 1 FIG. 20 is an enlarged structural diagram of part A in the device;

[0041] Figure 5 A sealed breathing device for high-viscosity gases according to the present invention Figure 3 FIG. 26 is an enlarged structural diagram of part B in the device.

[0042] In the figure: 1. Tank; 2. Connecting pipe; 3. Spring-loaded pilot valve; 31. Spring 1; 32. Piston rod; 33. Limit block; 34. Exhaust port; 4. Single-acting pneumatic switch; 41. Installation cylinder; 42. Spring 2; 43. Piston shaft; 44. Piston cylinder; 45. Connecting pipe; 46. Dialing plate; 47. Sleeve; 48. Rack; 49. Limit switch; 5. Gas pipe; 6. Ball valve; 7. Connecting shaft; 71. Gear; 8. Vacuum-breaking valve; 81. Valve stem; 82. Valve disc. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0044] Embodiment 1

[0045] Please refer to Figures 1 - 5 , the present invention provides a technical solution: a sealed breathing device for high-viscosity gases, including a tank 1, a connecting pipe 2 is connected to the top of the tank 1, a spring-loaded pilot valve 3 for controlling the input or output of gas is connected to the connecting pipe 2, a ball valve 6 for pressure relief and a vacuum-breaking valve 8 for ensuring the same pressure between the tank 1 and the outside are respectively connected to both sides of the connecting pipe 2, and the spring-loaded pilot valve 3 is located on the adjacent side of the ball valve 6 and the vacuum-breaking valve 8;

[0046] Among them, a connecting shaft 7 is fixedly connected to the ball valve 6. At one end of the connecting shaft 7 away from the ball valve 6, a single-acting pneumatic switch 4 for controlling the opening and closing of the ball valve 6 is installed. Two gas pipelines 5 are communicated with the spring-type pilot valve 3. One gas pipeline 5 is communicated with a gas source, and the spring-type pilot valve 3 and the single-acting pneumatic switch 4 are communicated through the other gas pipeline 5.

[0047] In this embodiment, specifically: during the rotation of the set ball valve 6, the friction generated between its valve core and valve body will scrape off the high-viscosity substances adhering to the valve core, and the opening and closing of the ball valve 6 are controlled by the spring-type pilot valve 3 and the single-acting pneumatic switch 4. This not only effectively prevents problems such as high-viscosity gas adhering to the valve cover, resulting in difficult maintenance, high failure rate, and poor sealing performance, but also can achieve the precise opening of the ball valve 6 by calculating the opening pressure and selecting a suitable spring according to the usage conditions. Moreover, compared with the sealing method of generally setting a gasket at the bottom of the valve disc, the ball valve 6 can achieve a higher degree of sealing effect.

[0048] In this embodiment, specifically: a first spring 31 and a piston rod 32 are respectively arranged in the spring-type pilot valve 3. The piston rod 32 is installed at the bottom of the first spring 31. A limiting block 33 is integrally formed on one side adjacent to the two plates of the piston rod 32 inside the spring-type pilot valve 3. An exhaust port 34 is opened below the other gas pipeline 5 on the spring-type pilot valve 3. The first spring 31 drives the piston rod 32 to reset through its own elastic potential energy, and the piston rod 32 changes the gas path under the action of the limiting block 33 through different pressure transformations;

[0049] Among them, the top of the first spring 31 is welded inside the spring-type pilot valve 3. The piston rod 32 slides inside the spring-type pilot valve 3. The limiting block 33 is located above one gas pipeline 5. Through the above settings, the gas source enters or exits through the gas path.

[0050] In this embodiment, specifically: a mold cavity is formed on one side adjacent to the spring-type pilot valve 3 of the connecting pipeline 2. A diaphragm is installed in the mold cavity, and the diaphragm is located below the piston rod 32.

[0051] In this embodiment, specifically: the single-acting pneumatic switch 4 includes a mounting tube 41, a piston cylinder 44, a connecting pipe 45 and a limit switch 49. The mounting tube 41 is connected to the piston cylinder 44 through the connecting pipe 45. A spring 2 42 and a piston shaft 43 are respectively arranged in the mounting tube 41. The spring 2 42 is sleeved on the piston shaft 43. One end of the piston shaft 43 runs through the piston cylinder 44. The mounting tube 41 is used to receive the spring 2 42 and the piston shaft 43, and the piston cylinder 44 is used to receive the input air source and the extension section of the piston shaft 43. At the same time, the connecting pipe 45 is used for the connection between the mounting tube 41 and the piston cylinder 44. The limit switch 49 detects the position of the toggle plate 46 to realize opening and closing, and then feedback the operating status of the tank body 1.

[0052] Among them, one end of the second spring 42 is welded in the mounting tube 41, and the piston shaft 43 slides in the mounting tube 41. Through the above arrangement, the elastic potential energy of the second spring 42 drives the piston shaft 43 to reset;

[0053] Among them, the spring 2 42 forms a reset mechanism with the mounting tube 41 through the piston shaft 43, and the reset mechanism is used to restore the entire device to a normal pressure state after completing the overpressure relief state.

[0054] In this embodiment, specifically: a toggle plate 46 is installed in the connecting pipe 45, and a sleeve 47 is installed on the piston shaft 43. The toggle plate 46 is used to receive the slide rod on the sleeve 47, and the sleeve 47 is used to perform linkage when the piston shaft 43 runs;

[0055] Among them, a slide groove is opened on the toggle plate 46, and a slide rod is welded on the sleeve 47, and the slide rod runs through the slide groove. Through the above-mentioned arrangement, the toggle plate 46 is driven to operate by the horizontally sliding slide rod, so that the limit switch 49 is changed (opened or closed), thereby informing the staff of the operating status of the tank body 1 (normal pressure state or overpressure relief state).

[0056] In this embodiment, specifically: a tooth plate 48 is also welded on the sleeve 47, a gear 71 is installed on the top of the connecting shaft 7, and the tooth plate 48 is meshed with the gear 71. Through the arrangement of the tooth plate 48, on the one hand, a linkage effect is generated through the sleeve 47 under the action of the piston shaft 43, and on the other hand, it is used to drive the gear 71 meshed with it. Among them, through the above arrangement, the force of the horizontal operation of the piston shaft 43 can be converted into the force of the circumferential operation of the connecting shaft 7.

[0057] In this embodiment, specifically: A valve stem 81 and a valve disc 82 are respectively arranged inside the vacuum-breaking valve 8. The valve disc 82 is installed on the valve stem 81. The valve stem 81 slides inside the vacuum-breaking valve 8. By providing the valve stem 81, on the one hand, under the action of the pressure difference, it vertically slides inside the vacuum-breaking valve 8. On the other hand, it is used to support the valve disc 82 and drive the valve disc 82 to lift and lower together. And by providing the valve disc 82 to cover the valve seat of the closed vacuum-breaking valve 8, the complete sealing of the vacuum-breaking valve 8 is achieved.

[0058] Embodiment 2

[0059] A method for realizing a sealed breathing device applicable to high-viscosity gases includes the following steps:

[0060] S1. Normal working state;

[0061] A1. The second spring 42 and the piston shaft 43 in the reset mechanism are in a compressed state;

[0062] A2. At this time, the limit block 33 in the spring-type pilot valve 3 is in contact with the upper plate body of the piston rod 32, that is, the piston rod 32 is in the first position;

[0063] A3. The air source enters the spring-type pilot valve 3 through one side of the gas pipeline 5 and enters the piston cylinder 44 through the gas pipeline 5 on the other side;

[0064] A4. Since the air source continuously supplies compressed gas, a certain gas pressure is generated in the piston cylinder 44;

[0065] A5. At the same time, the limit switch 49 on the single-acting pneumatic switch 4 is in the closed state, the ball valve 6 is in the cut-off state, and the entire connecting pipeline 2 and the tank body 1 are in a sealed state, and normal operation is carried out;

[0066] S2. Overpressure relief state;

[0067] B1. When the pressure in the tank body 1 continues to rise, the piston rod 32 in the spring-type pilot valve 3 is lifted by the pressure, so that the piston rod 32 moves vertically and compresses the first spring 31 at the top of the valve;

[0068] B2. At this time, since the piston rod 32 moves upward, the gas path between the spring-type pilot valve 3 and the piston cylinder 44 is cut off, that is, the limit block 33 in the spring-type pilot valve 3 is in contact with the lower plate body of the piston rod 32, and the piston rod 32 is in the second position, resulting in a decrease in the air pressure in the piston cylinder 44;

[0069] B3. The second spring 42 pulls the piston shaft 43 to move rightward. During the compression process, the gas is discharged through the exhaust port 34, and drives the sleeve 47 installed on the piston shaft 43 to move horizontally. By means of the engagement of the toothed plate 48 and the gear 71, the connecting shaft 7 rotates, and thus the linkage operation of the valve core of the ball valve 6 is realized through the rotating connecting shaft 7, making the ball valve 6 in the conducting state. Then, the high-pressure gas in the tank body 1 is discharged to the external atmosphere or the external waste treatment device to achieve overpressure relief.

[0070] B4. After discharging the high-pressure gas, the pressure in the tank body 1 decreases. The piston rod 32 of the spring-type pilot valve 3 returns to its original position under the elastic force of the first spring 31, making the gas path connected. The second spring 42 pulls the piston shaft 43 to move leftward, and the ball valve 6 rotates to the sealed state and returns to the normal working state.

[0071] S3. Vacuum overpressure state.

[0072] C1. When a vacuum overpressure state appears in the tank body 1, due to the pressure difference, the valve disc 82 of the vacuum-breaking valve 8 opens, and thus the external atmosphere enters the connecting pipe 2 to achieve pressure balance. Then the valve disc 82 closes, and the tank body 1 turns to the normal pressure state.

[0073] In this embodiment, specifically: in A4, the elastic force of the second spring 42 is F1, and the gas pressure is P1. Among them, the conveyed gas pressure P1 is equal to the elastic force F1 of the second spring 42.

[0074] In B2, when the air pressure in the piston cylinder 44 decreases, the conveyed gas pressure P1 is less than the elastic force F1 of the second spring 42.

[0075] In this embodiment, specifically: the entry of external air prevents the connecting pipe 2 from being damaged due to excessive negative pressure, and the air source continuously supplies gas to the piston cylinder 44, and the ball valve 6 always remains in the closed state.

[0076] Working principle: When in the normal working state, the second spring 42 and the piston shaft 43 in the reset mechanism are in the compressed state. At this time, the limiting block 33 in the spring-type pilot valve 3 fits with the plate body on the piston rod 32, that is, the piston rod 32 is in the first position, making the air source enter the spring-type pilot valve 3 through the gas pipe 5 on one side and enter the piston cylinder 44 through the gas pipe 5 on the other side. Since the air source continuously conveys compressed gas, there is a certain gas pressure in the piston cylinder 44. At this time, the conveyed gas pressure P1 is equal to the elastic force F1 of the second spring 42, the limit switch 49 on the single-acting pneumatic switch 4 is in the closed state, the ball valve 6 is in the cut-off state, and the entire connecting pipe 2 and the tank body 1 are in the sealed state for normal operation.

[0077] When in the overpressure relief state, the pressure inside the tank body 1 continues to rise. The piston rod 32 in the pressure-lifting spring-type pilot valve 3 causes the piston rod 32 to move vertically and compress the spring 31 at the top of the valve. At this time, due to the upward movement of the piston rod 32, the gas path between the spring-type pilot valve 3 and the piston cylinder 44 is cut off. That is, the limit block 33 in the spring-type pilot valve 3 fits with the lower plate body of the piston rod 32, and the piston rod 32 is in the second position, resulting in a decrease in the air pressure inside the piston cylinder 44. At this time, the pressure P1 of the conveyed gas is less than the elastic force F1 of the spring 42. The spring 42 pulls the piston shaft 43 to move to the right, and the compressed gas is discharged through the exhaust port 34, driving the sleeve 47 installed on the piston shaft 43 to move horizontally. And by means of the engagement of the toothed plate 48 and the gear 71, the connecting shaft 7 rotates, thereby realizing the linkage operation of the valve core of the ball valve 6 through the rotating connecting shaft 7, making the ball valve 6 in the conducting state, and then discharging the high-pressure gas inside the tank body 1 to the external atmosphere or the external waste treatment device to achieve overpressure relief;

[0078] It should be further elaborated that after discharging the high-pressure gas, the pressure inside the tank body 1 decreases, and the piston rod 32 of the spring-type pilot valve 3 returns to its original position under the elastic force of the spring 31, making the gas path connected. The spring 42 pulls the piston shaft 43 to move to the left, and the ball valve 6 rotates to the sealed state and returns to the normal working state;

[0079] When in the vacuum overpressure state, a vacuum overpressure state appears inside the tank body 1. Due to the pressure difference, the valve disc 82 of the vacuum-breaking valve 8 opens, so that the external atmosphere enters the connecting pipe 2, thereby achieving pressure balance. The valve disc 82 closes, and the tank body 1 turns into the normal pressure state.

[0080] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealed breathing device suitable for high-viscosity gas, comprising a tank body (1), characterized in that: The top of the tank body (1) is connected to a connecting pipe (2), and the connecting pipe (2) is connected to a spring-type pilot valve (3) for controlling gas input or output. The two sides of the connecting pipe (2) are respectively connected to a ball valve (6) for pressure relief and a vacuum breaker valve (8) for ensuring that the tank body (1) is consistent with the external pressure, and the spring-type pilot valve (3) is located on a side adjacent to the ball valve (6) and the vacuum breaker valve (8); The ball valve (6) is fixedly connected to a connecting shaft (7), and a single-acting pneumatic switch (4) for controlling the opening and closing of the ball valve (6) is installed at one end of the connecting shaft (7) away from the ball valve (6). The spring-type pilot valve (3) is connected to two gas pipelines (5), one of the gas pipelines (5) is connected to a gas source, and the spring-type pilot valve (3) is connected to the single-acting pneumatic switch (4) through the other gas pipeline (5).

2. A sealed breathing device suitable for high viscosity gas according to claim 1, characterized in that: The spring-type pilot valve (3) is provided with a spring (31) and a piston rod (32), the piston rod (32) being mounted at the bottom of the spring (31), a limit block (33) being fixedly connected to the spring-type pilot valve (3) and located on one side adjacent to two plates of the piston rod (32), and an exhaust port (34) being provided on the spring-type pilot valve (3) and located below another gas pipeline (5); The top of the spring 1 (31) is fixedly connected to the spring-type pilot valve (3), the piston rod (32) slides in the spring-type pilot valve (3), and the limit block (33) is located above a gas pipeline (5).

3. A sealed breathing device suitable for high viscosity gas according to claim 2, characterized in that: A mold cavity is formed on one side of the connecting pipe (2) and the spring-type pilot valve (3), a diaphragm is installed in the mold cavity, and the diaphragm is located below the piston rod (32).

4. A sealed breathing device suitable for high viscosity gas according to claim 1, characterized in that: The single-acting pneumatic switch (4) comprises a mounting tube (41), a piston cylinder (44), a connecting pipe (45) and a limit switch (49); the mounting tube (41) is connected to the piston cylinder (44) through the connecting pipe (45); a second spring (42) and a piston shaft (43) are respectively arranged in the mounting tube (41); the second spring (42) is sleeved on the piston shaft (43); one end of the piston shaft (43) passes through the piston cylinder (44); Wherein, one end of the spring 2 (42) is fixedly connected to the installation cylinder (41), and the piston shaft (43) slides in the installation cylinder (41); The second spring (42) forms a reset mechanism through the piston shaft (43) and the mounting cylinder (41).

5. A sealed breathing device suitable for high viscosity gas according to claim 4, characterized in that: A toggle plate (46) is installed in the connecting pipe (45), and a sleeve (47) is installed on the piston shaft (43); The toggle plate (46) is provided with a slide groove, the sleeve (47) is fixedly connected with a slide rod, and the slide rod runs through the slide groove.

6. A sealed breathing device suitable for high viscosity gas according to claim 5, characterized in that: The sleeve (47) is also fixedly connected with a toothed plate (48), a gear (71) is installed on the top of the connecting shaft (7), and the toothed plate (48) is meshed with the gear (71).

7. A sealed breathing device suitable for high viscosity gas according to claim 1, characterized in that: The vacuum breaker valve (8) is provided with a valve stem (81) and a valve disc (82) respectively. The valve disc (82) is mounted on the valve stem (81), and the valve stem (81) slides in the vacuum breaker valve (8).

8. A method for implementing a sealed breathing device suitable for high-viscosity gas, characterized in that: The following steps are involved: S1, normal working state; A1, the spring 2 (42) and the piston shaft (43) in the reset mechanism are in a compressed state; A2. At this time, the limit block (33) in the spring-type pilot valve (3) is in contact with the upper plate of the piston rod (32), that is, the piston rod (32) is in the first position; A3, allowing the gas source to enter the spring-loaded pilot valve (3) through the gas pipeline (5) on one side, and enter the piston cylinder (44) through the gas pipeline (5) on the other side; A4. Since the gas source continuously delivers compressed gas, a certain gas pressure is generated in the piston cylinder (44); A5. At the same time, the limit switch (49) on the single-acting pneumatic switch (4) is in the closed state, the ball valve (6) is in the cut-off state, and the entire connecting pipe (2) and the tank body (1) are in a sealed state and work normally; S2, overpressure relief state; B1. When the pressure in the tank (1) continues to rise, the pressure pushes up the piston rod (32) in the spring-type pilot valve (3), causing the piston rod (32) to move vertically and compress the spring 1 (31) at the top of the valve; B2. At this time, since the piston rod (32) moves upward, the air path between the spring-type pilot valve (3) and the piston cylinder (44) is cut off, that is, the limit block (33) in the spring-type pilot valve (3) is in contact with the lower plate of the piston rod (32), and the piston rod (32) is in the second position, resulting in a decrease in the air pressure in the piston cylinder (44); B3. The second spring (42) pulls the piston shaft (43) to move rightward, and the compressed gas is discharged through the exhaust port (34), and drives the sleeve (47) installed on the piston shaft (43) to move horizontally, and the tooth plate (48) is meshed with the gear (71), so that the connecting shaft (7) rotates, thereby realizing the linkage operation of the valve core of the ball valve (6) through the rotating connecting shaft (7), so that the ball valve (6) is in a conducting state, and then the high-pressure gas in the tank body (1) is discharged to the external atmosphere or an external waste treatment device, thereby realizing overpressure relief; B4. After the high-pressure gas is released, the pressure in the tank (1) decreases, and the piston rod (32) of the spring-loaded pilot valve (3) returns to its original position under the elastic force of the spring 1 (31), so that the gas path is connected, and the spring 2 (42) pulls the piston shaft (43) to move leftward, and the ball valve (6) rotates to a sealed state, returning to a normal working state; S3, vacuum overpressure state; C1. When a vacuum overpressure state occurs in the tank body (1), the valve disc (82) of the vacuum breaker valve (8) opens due to the pressure difference, so that the external atmosphere enters the connecting pipe (2), thereby achieving pressure balance. The valve disc (82) closes and the tank body (1) returns to a normal pressure state.

9. A method for implementing a sealed breathing device suitable for high-viscosity gas according to claim 8, characterized in that: In A4, the elastic force of the second spring (42) is F1, and the gas pressure is P1, wherein the delivered gas pressure P1 is equal to the elastic force F1 of the second spring (42); In B2, when the gas pressure in the piston cylinder (44) decreases, the delivered gas pressure P1 is smaller than the elastic force F1 of the second spring (42).

Images