flame-proof pressure gauge

Abstract

The present application belongs to the technical field of explosion-proof pressure gauges, and relates to an explosion-proof pressure gauge. A transmission device is arranged on a shell, a blocking device for sealing the blocking mounting seat is arranged on the blocking mounting seat, the driving device limits the movement of the blocking device by driving the transmission device, the display cavity and the wiring cavity are mutually isolated through two sealing cavities, penetration of explosive gas into the wiring cavity is prevented, and explosion is prevented. When explosion occurs, the pressure in the detection cavity will decrease, and the driving device will no longer press the transmission device as the air pressure decreases. The transmission device that is not pressed will release the limit of the blocking device. The blocking device that is released from the limit will block the blocking mounting seat. After the blocking mounting seat is blocked, gas cannot be discharged outward through the open air pressure communication pipe.

Description

Technical Field

[0001] This invention belongs to the technical field of explosion-proof pressure gauges, and particularly relates to explosion-proof pressure gauges. Background Technology

[0002] In recent years, local pressure gauges have gained increasing attention from users in both domestic and international energy markets, and the government has also strengthened mandatory testing of pressure gauges. For example, petrochemical plants often have explosive gas environments, requiring them to meet explosion-proof requirements; they also need remote pressure alarm transmission capabilities. To meet market demands, a high-precision, stable pressure gauge has been developed. It utilizes pressure changes to drive changes in electrical contacts. When these contacts contact or disconnect with the upper and lower limit contacts, a relay in the electrical circuit is activated, thus achieving automatic control and alarm functions. The gauge features two sealed chambers, safety glass, and explosion-proof joints sealed with threads or sealant to meet explosion-proof requirements.

[0003] Current explosion-proof pressure gauges, if not properly sealed at the air inlet after an explosion, can easily cause secondary damage. Summary of the Invention

[0004] The purpose of this invention is to provide an explosion-proof pressure gauge to solve the problem of sealing off the air inlet when the explosion-proof pressure gauge explodes.

[0005] To achieve the above objectives, the specific technical solution of the explosion-proof pressure gauge of the present invention is as follows:

[0006] An explosion-proof pressure gauge includes a display cover, tempered glass, a pressure ring, a housing, a display device, a detection chamber, a pressure connecting pipe, a top cover, and an explosion-proof cable sealing connector. The display cover is mounted on the housing, with tempered glass and a pressure ring between the display cover and the housing. The housing contains a display device for displaying the electrical display, nameplate, and pointer. The detection chamber is located inside the housing, and the housing has a pressure connecting pipe communicating with the detection chamber. The top cover is mounted on the housing, and the explosion-proof cable sealing connector is mounted on the top cover. The gauge is characterized by having a driving device communicating with the detection chamber on the housing, a barrier mounting seat on the pressure connecting pipe, a transmission device on the housing, and a barrier device for sealing the barrier mounting seat. The driving device restricts the movement of the barrier device by driving the transmission device.

[0007] Furthermore, the barrier mounting base includes a mounting base, a connecting hole, and a sliding groove. The mounting base is disposed on the air pressure connecting pipe and communicates with the detection chamber. The barrier device controls the opening and closing of the connecting hole through the sliding groove.

[0008] Furthermore, the driving device includes a fixed cylinder, a pushing chamber, an air inlet, a movable plug, a first spring, and a pushing inclined bolt. The fixed cylinder is mounted on the housing and communicates with the detection chamber. The pushing chamber is located inside the fixed cylinder, with the air inlet facing the inside of the pushing chamber. The movable plug slides inside the pushing chamber. A pushing inclined bolt is provided at the end of the movable plug that does not face the air inlet. The first spring is located inside the fixed cylinder and is fitted onto the pushing inclined bolt. The pushing inclined bolt compresses the transmission device.

[0009] Furthermore, the inclined surface of the pusher bolt faces the transmission device.

[0010] Furthermore, the transmission device includes a fixed plate, a sliding bar, a movable push plate, a second spring, and a limiting fork. The fixed plate is mounted on the housing, the sliding bar slides on the fixed plate, one end of the sliding bar is provided with a movable push plate, and the other end of the sliding bar is provided with a limiting fork. The second spring is fitted on the sliding bar and is placed between the fixed plate and the movable push plate. The inclined bolt pushes the movable push plate, and the limiting fork restricts the sliding of the blocking device.

[0011] Furthermore, the blocking device includes a mounting bracket, a pull bolt, a third spring, a connecting plate, and a sealing plate. The mounting bracket is mounted on the mounting base, the pull bolt slides on the upper mounting bracket, the third spring is fitted onto the pull bolt and is positioned between the mounting bracket and the pull bolt, the connecting plate is mounted on the pull bolt, the pull bolt is equipped with a sealing plate, the sealing plate slides inside the sliding groove, and the limiting fork restricts the movement of the connecting plate.

[0012] Furthermore, there are two of the mounting bracket, pull bolt, and third spring.

[0013] The advantages of this invention are:

[0014] This invention uses two sealed cavities to isolate the display cavity and the wiring cavity from each other, preventing explosive gas from penetrating into the wiring cavity and causing an explosion. When an explosion occurs, the pressure inside the detection cavity will decrease. As the gas pressure decreases, the drive device will stop squeezing the transmission device. The transmission device, no longer squeezed, will release the limit on the blocking device. The released blocking device will block the blocking mounting seat. After the blocking mounting seat is blocked, gas can no longer be discharged outward through the open gas pressure connecting pipe. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 Cross-sectional view of the overall structure of the present invention Figure 1 ;

[0017] Figure 3 Cross-sectional view of the overall structure of the present invention Figure 2 ;

[0018] Explanation of markings in the diagram:

[0019] 1. Display cover; 2. Tempered glass; 3. Pressure ring; 4. Housing; 5. Display device; 6. Detection chamber; 7. Air pressure connecting pipe; 8. Top cover; 9. Explosion-proof cable sealing joint; 10. Barrier mounting base; 10-1. Mounting base; 10-2. Connecting hole; 10-3. Sliding groove; 11. Drive device including fixed cylinder 11-1; pushing chamber 11-2; air inlet 11-3; moving plug 11-4; first spring 11-5; pushing inclined bolt 11-6; Transmission device 12 including fixed plate 12-1; sliding bar 12-2; moving push plate 12-3; second spring 12-4; limiting fork 12-5; Barrier device 13 including mounting bracket 13-1; pulling bolt 13-2; third spring 13-3; connecting plate 13-4; sealing plate 13-5. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figure 1-3 As shown, an explosion-proof pressure gauge includes a display cover 1, tempered glass 2, pressure ring 3, housing 4, display device 5, detection chamber 6, air pressure connecting pipe 7, top cover 8, and explosion-proof cable sealing joint 9. The display cover 1 is disposed on the housing 4, and tempered glass 2 and pressure ring 3 are disposed between the display cover 1 and the housing 4. The housing 4 is provided with a display device 5 for displaying the electrical frame, nameplate, and pointer. The detection chamber 6 is disposed inside the housing 4, and the housing 4 is provided with an air pressure connecting pipe 7 communicating with the detection chamber 6. The top cover 8 is disposed on the housing 4, and the explosion-proof cable sealing joint 9 is disposed on the top cover 8. The characteristic feature is that the housing 4 is provided with a driving device 11 communicating with the detection chamber 6, the air pressure connecting pipe 7 is provided with a barrier mounting seat 10, the housing 4 is provided with a transmission device 12, and the barrier mounting seat 10 is provided with a barrier device 13 for sealing the barrier mounting seat 10. The driving device 11 restricts the movement of the barrier device 13 by driving the transmission device 12.

[0023] The display chamber and the wiring chamber are isolated from each other by two sealed chambers to prevent explosive gas from penetrating into the wiring chamber and causing an explosion. When an explosion occurs, the pressure inside the detection chamber 6 will decrease. As the air pressure decreases, the drive device 11 will no longer squeeze the transmission device 12. The transmission device 12, which is no longer squeezed, will release the limit on the blocking device 13. The released blocking device 13 will block the blocking mounting seat 10. After the blocking mounting seat 10 is blocked, gas can no longer be discharged to the outside through the open air pressure connecting pipe 7.

[0024] Among them, such as Figure 1-3 As shown, the barrier mounting base 10 includes a mounting base 10-1, a connecting hole 10-2, and a sliding groove 10-3. The mounting base 10-1 is disposed on the air pressure connecting pipe 7 and communicates with the detection chamber 6. The barrier device 13 controls the opening and closing of the connecting hole 10-2 by the sliding groove 10-3.

[0025] The connecting hole 10-2 of the mounting base 10-1 is connected to the air pressure connecting pipe 7, and the blocking device 13 controls the closing of the connecting hole 10-2 by sliding the sliding groove 10-3.

[0026] Among them, such as Figure 1-3 As shown, the driving device 11 includes a fixed cylinder 11-1, a pushing cavity 11-2, an air inlet 11-3, a movable plug 11-4, a first spring 11-5, and a pushing inclined bolt 11-6. The fixed cylinder 11-1 is mounted on the housing 4 and communicates with the detection cavity 6. The pushing cavity 11-2 is located inside the fixed cylinder 11-1. The air inlet 11-3 faces the inside of the pushing cavity 11-2. The movable plug 11-4 slides inside the pushing cavity 11-2. The end of the movable plug 11-4 that does not face the air inlet 11-3 is provided with the pushing inclined bolt 11-6. The first spring 11-5 is located inside the fixed cylinder 11-1 and is fitted onto the pushing inclined bolt 11-6. The pushing inclined bolt 11-6 compresses the transmission device 12.

[0027] When there is air pressure inside the detection chamber 6, the pressure will push the movable plug 11-4 to slide inside the pushing chamber 11-2. The moving movable plug 11-4 drives the pushing inclined plate bolt 11-6 to move and compress the first spring 11-5. When the pressure in the detection chamber 6 is released, the compressed first spring 11-5 will push the movable plug 11-4 to reset. The reset movable plug 11-4 drives the pushing inclined plate bolt 11-6 to move and release the pressure on the transmission device 12.

[0028] Among them, such as Figure 1-3 As shown, the inclined surface of the push inclined bolt 11-6 faces the transmission device 12.

[0029] Among them, such as Figure 1-3As shown, the transmission device 12 includes a fixed plate 12-1, a sliding bar 12-2, a movable push plate 12-3, a second spring 12-4, and a limiting fork 12-5. The fixed plate 12-1 is mounted on the housing 4. The sliding bar 12-2 slides on the fixed plate 12-1. One end of the sliding bar 12-2 is provided with the movable push plate 12-3, and the other end of the sliding bar 12-2 is provided with the limiting fork 12-5. The second spring 12-4 is fitted on the sliding bar 12-2 and is placed between the fixed plate 12-1 and the movable push plate 12-3. The inclined bolt 11-6 pushes and presses the movable push plate 12-3, and the limiting fork 12-5 restricts the sliding of the blocking device 13.

[0030] The movable inclined plate 11-6 pushes the movable push plate 12-3 downward. The movable push plate 12-3 pushes the limiting fork 12-5 through the sliding bar 12-2 to move to limit the blocking device 13 and compress the second spring 12-4. When the inclined plate 11-6 stops pressing the movable push plate 12-3, the compressed second spring 12-4 will push the movable push plate 12-3 upward. The upward movement will cause the limiting fork 12-5 to release the restriction on the blocking device 13.

[0031] Among them, such as Figure 1-3 As shown, the blocking device 13 includes a mounting bracket 13-1, a pull bolt 13-2, a third spring 13-3, a connecting plate 13-4, and a sealing plate 13-5. The mounting bracket 13-1 is mounted on the mounting base 10-1. The pull bolt 13-2 slides on the upper mounting bracket 13-1. The third spring 13-3 is fitted onto the pull bolt 13-2 and is positioned between the mounting bracket 13-1 and the pull bolt 13-2. The connecting plate 13-4 is mounted on the pull bolt 13-2. The pull bolt 13-2 is provided with a sealing plate 13-5, which slides inside the sliding groove 10-3. The limiting fork 12-5 restricts the movement of the connecting plate 13-4.

[0032] When the limiting fork 12-5 restricts the connecting plate 13-4, the compressed third spring 13-3 cannot push the pull bolt 13-2 to move the sealing plate 13-5 to the position that seals the connecting hole 10-2. When the limiting fork 12-5 releases the restriction on the connecting plate 13-4, the compressed third spring 13-3 will push the pull bolt 13-2 to move. The moving pull bolt 13-2 will drive the sealing plate 13-5 to move through the connecting plate 13-4 and block the connecting hole 10-2, thus preventing the air pressure connecting pipe 7 from venting gas.

[0033] Among them, such as Figure 1-3 As shown, there are two of the mounting bracket 13-1, the pull bolt 13-2, and the third spring 13-3.

[0034] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. An explosion-proof pressure gauge, comprising a display cover (1), tempered glass (2), a pressure ring (3), a shell (4), a display device (5), a detection cavity (6), an air pressure communication pipe (7), a top cover (8) and an explosion-proof cable sealing joint (9), the display cover (1) is arranged on the shell (4), tempered glass (2) and the pressure ring (3) are arranged between the display cover (1) and the shell (4), the shell (4) is internally provided with a display device (5) for displaying an electric frame, a nameplate and a pointer, the detection cavity (6) is arranged inside the shell (4), the shell (4) is provided with an air pressure communication pipe (7) in communication with the detection cavity (6), the top cover (8) is arranged on the shell (4), and the explosion-proof cable sealing joint (9) is arranged on the top cover (8), characterized in that, The shell (4) is provided with a driving device (11) communicated with the detection cavity (6), the air pressure communication pipe (7) is provided with a blocking mounting seat (10), the shell (4) is provided with a transmission device (12), the blocking mounting seat (10) is provided with a blocking device (13) for sealing the blocking mounting seat (10), the driving device (11) drives the transmission device (12) to limit the movement of the blocking device (13); The blocking mounting seat (10) comprises a mounting seat (10-1), a communication hole (10-2) and a sliding groove (10-3), the mounting seat (10-1) is arranged on the air pressure communication pipe (7) and communicated with the detection cavity (6), the blocking device (13) controls the opening and closing of the communication hole (10-2) through the sliding groove (10-3); The driving device (11) comprises a fixed cylinder (11-1), a pushing cavity (11-2), an air inlet hole (11-3), a movable plug (11-4), a first spring (11-5) and a pushing inclined surface bolt (11-6), the fixed cylinder (11-1) is arranged on the shell (4) and communicated with the detection cavity (6), the pushing cavity (11-2) is arranged in the fixed cylinder (11-1), the air inlet hole (11-3) is directed to the inside of the pushing cavity (11-2), the movable plug (11-4) slides in the pushing cavity (11-2), one end of the movable plug (11-4) away from the air inlet hole (11-3) is provided with the pushing inclined surface bolt (11-6), the first spring (11-5) is arranged in the fixed cylinder (11-1), the first spring (11-5) is sleeved on the pushing inclined surface bolt (11-6), and the pushing inclined surface bolt (11-6) extrudes the transmission device (12); The inclined surface of the pushing inclined surface bolt (11-6) is directed to the transmission device (12); The transmission device (12) comprises a fixed plate (12-1), a sliding bar (12-2), a movable push plate (12-3), a second spring (12-4) and a limiting fork (12-5), the fixed plate (12-1) is arranged on the shell (4), the sliding bar (12-2) slides on the fixed plate (12-1), one end of the sliding bar (12-2) is provided with the movable push plate (12-3), the other end of the sliding bar (12-2) is provided with the limiting fork (12-5), the second spring (12-4) is sleeved on the sliding bar (12-2), the second spring (12-4) is arranged between the fixed plate (12-1) and the movable push plate (12-3), the pushing inclined surface bolt (11-6) extrudes the movable push plate (12-3), and the limiting fork (12-5) limits the sliding of the blocking device (13).

2. The explosion-proof pressure gauge according to claim 1, characterized in that The blocking device (13) comprises a mounting frame (13-1), a pulling bolt (13-2), a third spring (13-3), a connecting plate (13-4) and a sealing plate (13-5), the mounting frame (13-1) is arranged on the mounting seat (10-1), the pulling bolt (13-2) slides on the upper mounting frame (13-1), the third spring (13-3) is sleeved on the pulling bolt (13-2), the third spring (13-3) is arranged between the mounting frame (13-1) and the pulling bolt (13-2), the connecting plate (13-4) is arranged on the pulling bolt (13-2), the pulling bolt (13-2) is provided with the sealing plate (13-5), the sealing plate (13-5) slides in the sliding groove (10-3), and the limiting fork (12-5) limits the movement of the connecting plate (13-4).

3. The explosion-proof pressure gauge according to claim 2, characterized in that The size of the limiting fork (12-5) is greater than the diameter of the pulling bolt (13-2).

4. The explosion-proof pressure gauge according to claim 3, characterized in that The number of the mounting frame (13-1), the pulling bolt (13-2) and the third spring (13-3) is two.

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