An overpressure protection device for a pressure reducing valve

Abstract

The present invention discloses an overpressure protection device for a pressure reducing valve, comprising a main cylinder body, a cover plate fixedly connected to the top of the main cylinder body, a cylinder cover provided at the bottom of the cover plate, an annular groove corresponding to the cylinder cover provided on the inner wall of the main cylinder body, a fixing screw slidably inserted at the top of the cylinder cover, a limit plate slidably sleeved on the top of the fixing screw, a fixing bolt threadedly sleeved on the fixing screw, a first spring sleeved on the fixing screw, the two ends of the first spring respectively abutting against the cover plate and the cylinder cover; two symmetrically arranged fixing blocks fixedly connected in the main cylinder body, a pressure relief rod rotatably connected between the two fixing blocks via a rotating shaft, a support block fixedly connected to the bottom of the fixing screw, a jack corresponding to the pressure relief rod provided on the support block. The present invention enables the pressure reducing valve to automatically adjust the protection mechanism according to the pressure of the gas through the provision of the overpressure protection mechanism, thereby improving the use safety of the pressure reducing valve.

Description

Technical Field

[0001] The invention relates to the technical field of pressure reducing valves, and in particular to an overpressure protection device of a pressure reducing valve. Background Art

[0002] A portable stove is a non-fixed household kitchen appliance, hotel supplies, and outdoor leisure supplies that uses butane gas as the main fuel, and liquefied gas and other gases can also be used as fuel for direct fire heating. A portable stove is also called a portable butane gas stove; a portable barbecue stove is a type of kitchen appliance that has just emerged in recent years and is mostly used for household outdoor leisure and hotel supplies.

[0003] The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through regulation, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. From the perspective of fluid mechanics, the pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of reducing pressure. Then, by relying on the regulation of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range.

[0004] However, the existing pressure reducing valve has a relatively simple internal structure and lacks a certain pressure protection mechanism inside the pressure reducing valve, which affects the safety of the pressure reducing valve. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] The purpose of the present invention is to solve the problem that the internal structure of the pressure reducing valve in the prior art is relatively simple and a certain pressure protection mechanism is lacking inside the pressure reducing valve, and to propose an overpressure protection device for the pressure reducing valve.

[0007] 2. Technical solution

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] An overpressure protection device for a pressure reducing valve comprises a main cylinder body, a cover plate is fixedly connected to the top of the main cylinder body, a cylinder cover is arranged at the bottom of the cover plate, an annular groove corresponding to the cylinder cover is arranged on the inner wall of the main cylinder body, a fixing screw is slidably inserted into the top of the cylinder cover, a limit plate is slidably sleeved on the top of the fixing screw, a fixing bolt is threadedly sleeved on the fixing screw, a first spring is sleeved on the fixing screw, and two ends of the first spring are respectively against the cover plate and the cylinder cover;

[0010] Two symmetrically arranged fixing blocks are fixedly connected in the main cylinder body, a pressure relief rod is rotatably connected between the two fixing blocks via a rotating shaft, a support block is fixedly connected to the bottom of the fixing screw, a plug hole corresponding to the pressure relief rod is provided on the support block, a vent is provided at the bottom of the main cylinder body, a pressure relief port communicating with the main cylinder body is provided on the inner wall of the vent, a fixing plug corresponding to the pressure relief port is fixedly inserted at one end of the pressure relief rod away from the supporting block, an air outlet head is fixedly inserted at one end of the vent, and an air inlet head is fixedly inserted at one end of the vent away from the air outlet head;

[0011] The bottom of the main cylinder body near the air inlet head is provided with a mounting port communicated with the vent, a baffle corresponding to the mounting port is fixedly connected to the outer wall of the main cylinder body, a pressure relief steel ball assembly is threadedly inserted into the end of the main cylinder body away from the baffle, a piston rod is slidably inserted into the mounting port, and a second spring is sleeved on the end of the piston rod located in the vent, and the two ends of the second spring are respectively against the piston rod and the inner wall of the pressure relief steel ball assembly;

[0012] The end of the piston rod away from the vent is fixedly connected to a transmission block, a side of the transmission block away from the piston rod is provided with a transmission groove, the transmission groove is slidably connected to a push rod, one end of the push rod penetrates the inner wall of the transmission groove and is fixedly connected to a button, a third spring is sleeved on the push rod, and the two ends of the third spring are respectively fixedly connected to the button and the inner wall of the transmission groove;

[0013] A control port is provided at the bottom of the vent near one end of the air outlet head, a fixing plate corresponding to the control port is fixedly connected to the outer wall of the main cylinder body, an adjusting rod is slidably inserted on the fixing plate, and a first sealing ring is fixedly sleeved on one end of the adjusting rod located in the control port.

[0014] Preferably, the cover plate is fixedly connected to the edge of the cylinder head by a plurality of first fastening bolts.

[0015] Preferably, the baffle is fixedly connected to the inner wall of the mounting opening by a plurality of second fastening bolts.

[0016] Preferably, the fixing plate is fixedly connected to the outer wall of the main cylinder body by a plurality of third fastening bolts.

[0017] Preferably, a fourth sealing ring is fixedly sleeved on one end of the air inlet head located in the air vent.

[0018] Preferably, one end of the air outlet head located in the air vent is fixedly sleeved with a second sealing ring.

[0019] Preferably, one end of the pressure relief steel ball assembly located in the installation opening is fixedly sleeved with a third sealing ring.

[0020] Preferably, the end of the push rod away from the button is in a trapezoidal shape.

[0021] Preferably, a plurality of screw columns are fixedly connected to the bottom of the main cylinder body, and a fixing opening is provided at the bottom of the screw columns.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] (1) In the present invention, by providing an overpressure protection mechanism, the pressure reducing valve can automatically adjust the protection mechanism according to the pressure of the gas, thereby improving the safety of the pressure reducing valve.

[0025] (2) In the present invention, when the gas pressure output from the butane cartridge gas cylinder to the valve body is lower than 5 bar, the valve body can work normally. When the input pressure of the gas cylinder is between 5 bar and 7 bar, the protection device of the valve body will function to cut off the gas and thus play a safety protection role. When the first protection of the valve body fails and the pressure input to the valve body reaches above 7 bar, the second protection of the valve body takes effect and the pressure relief steel ball assembly pops open the steel ball to release the gas. The gas is released to relieve the pressure, thereby preventing explosion and playing a safety protection role. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the three-dimensional structure of an overpressure protection device for a pressure reducing valve proposed by the present invention;

[0027] Figure 2 It is a right-side three-dimensional structural schematic diagram of an overpressure protection device of a pressure reducing valve proposed by the present invention;

[0028] Figure 3 It is a left-side three-dimensional structural schematic diagram of an overpressure protection device of a pressure reducing valve proposed by the present invention;

[0029] Figure 4 It is a structural explosion diagram of an overpressure protection device of a pressure reducing valve proposed by the present invention;

[0030] Figure 5 This is a schematic structural diagram of the main cylinder body of an overpressure protection device of a pressure reducing valve proposed by the present invention.

[0031] Figure 6 This is a schematic structural diagram of the cylinder cover of an overpressure protection device of a pressure reducing valve proposed by the present invention.

[0032] In the figure: 1 main cylinder body, 2 cover plate, 3 cylinder head, 4 fixing screw, 5 fixing bolt, 6 first spring, 7 fixing block, 8 rotating shaft, 9 pressure relief rod, 10 support block, 11 vent, 12 pressure relief port, 13 fixing plug, 14 air outlet, 15 air inlet, 16 mounting port, 17 baffle, 18 pressure relief steel ball assembly, 19 piston rod, 20 second spring, 21 transmission groove, 22 push rod, 23 button, 24 third spring, 25 control port, 26 fixing plate, 27 adjusting rod, 28 first sealing ring, 29 first fastening bolt, 30 second fastening bolt, 31 third fastening bolt, 32 fourth sealing ring, 33 second sealing ring, 34 third sealing ring, 35 screw column, 36 limit plate, 37 transmission block, 38 steel ball. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Embodiment 1:

[0035] Reference Figure 1-6 , an overpressure protection device of a pressure reducing valve comprises a main cylinder body 1, a plurality of screw columns 35 are fixedly connected to the bottom of the main cylinder body 1, a fixing port is provided at the bottom of the screw column 35, and it is convenient to fix the main cylinder body 1, a cover plate 2 is fixedly connected to the top of the main cylinder body 1, a cylinder cover 3 is provided at the bottom of the cover plate 2, and the edges of the cover plate 2 and the cylinder cover 3 are fixedly connected by a plurality of first fastening bolts 29, and it is convenient to fix and disassemble the cover plate 2, an annular groove corresponding to the cylinder cover 3 is provided on the inner wall of the main cylinder body 1, a fixing screw 4 is slidably inserted at the top of the cylinder cover 3 for fixing the support block 10, and a limiting plate 36 is slidably sleeved on the top of the fixing screw 4 for supporting the fixing screw 4, a fixing bolt 5 is threadedly sleeved on the fixing screw 4, and a first spring 6 is sleeved on the fixing screw 4, and the two ends of the first spring 6 are respectively against the cover plate 2 and the cylinder cover 3, so as to play a certain elastic extrusion effect on the cylinder cover 3;

[0036] In this embodiment, two symmetrically arranged fixed blocks 7 are fixedly connected in the main cylinder body 1 for supporting the pressure relief rod 9. The pressure relief rod 9 is rotatably connected between the two fixed blocks 7 through the rotating shaft 8. The bottom of the fixed screw 4 is fixedly connected with a support block 10 for supporting the pressure relief rod 9. The support block 10 is provided with a jack corresponding to the pressure relief rod 9. The bottom of the main cylinder body 1 is provided with a vent 11. The inner wall of the vent 11 is provided with a pressure relief port 12 communicated with the main cylinder body 1, which is used to introduce gas into the main cylinder body 1. The pressure relief rod 9 is away from the support. A fixed plug 13 corresponding to the pressure relief port 12 is fixedly inserted at one end of the support block 10 for blocking the pressure relief port 12; a gas outlet head 14 is fixedly inserted at one end of the vent 11 for guiding out gas; one end of the gas outlet head 14 located in the vent 11 is fixedly sleeved with a second sealing ring 33 to prevent gas leakage; an end of the vent 11 away from the gas outlet head 14 is fixedly inserted with an inlet head 15 for guiding out gas; one end of the gas inlet head 15 located in the vent 11 is fixedly sleeved with a fourth sealing ring 32 to prevent gas leakage;

[0037] In this embodiment, a mounting port 16 communicating with the air vent 11 is provided at the bottom of the main cylinder body 1 near one end of the air inlet head 15, which is used to set a piston rod 19. A baffle 17 corresponding to the mounting port 16 is fixedly connected to the outer wall of the main cylinder body 1, and the baffle 17 is fixedly connected to the inner wall of the mounting port 16 by a plurality of second fastening bolts 30, so as to facilitate the removal of the baffle 17. A pressure relief ball assembly 18 is threadedly inserted at one end of the main cylinder body 1 away from the baffle 17, which is used to support the piston rod 19 and also has the function of pressure relief. A third sealing ring 34 is fixedly sleeved at one end of the pressure relief ball assembly 18 located in the mounting port 16, and a piston rod 19 is slidably inserted in the mounting port 16, which is used to limit the flow of gas. A second spring 20 is sleeved at one end of the piston rod 19 located in the air vent 11, and the two ends of the second spring 20 are respectively against the piston rod 19 and the inner wall of the pressure relief ball assembly 18, so as to provide a certain elastic support for the piston rod 19.

[0038] In this embodiment, one end of the piston rod 19 away from the vent 11 is fixedly connected to a transmission block 37 for fixing the piston rod 19. A transmission groove 21 is provided on the side of the transmission block 37 away from the piston rod 19. A push rod 22 is slidably connected to the transmission groove 21 for limiting the transmission block 37. One end of the push rod 22 passes through the inner wall of the transmission groove 21 and is fixedly connected to a button 23 for pushing the push rod 22. The end of the push rod 22 away from the button 23 is in a trapezoidal shape for driving the transmission block 37 to move. A third spring 24 is sleeved on the push rod 22. The two ends of the third spring 24 are fixedly connected to the button 23 and the inner wall of the transmission groove 21, respectively.

[0039] In this embodiment, a control port 25 is provided at the bottom of the vent 11 near one end of the outlet head 14, which is used to set an adjusting rod 27. A fixing plate 26 corresponding to the control port 25 is fixedly connected to the outer wall of the main cylinder body 1. The fixing plate 26 is fixedly connected to the outer wall of the main cylinder body 1 by a plurality of third fastening bolts 31. An adjusting rod 27 is slidably inserted on the fixing plate 26 for adjusting the gas flow rate of the vent 11. One end of the adjusting rod 27 located in the control port 25 is fixedly sleeved with a first sealing ring 28 to prevent gas leakage.

[0040] In this embodiment, when the gas pressure output from the butane cartridge gas cylinder to the valve body is lower than 5 bar, the valve body can work normally. When the input pressure of the gas cylinder is between 5 bar and 7 bar, the pressure relief rod 9 is automatically lifted up, and then the cylinder cover 3 moves upward to cut off the gas, thereby playing a safety protection role. When the first protection of the valve body fails and the pressure input to the valve body reaches more than 7 bar, the second protection of the valve body takes effect, and the pressure relief steel ball assembly 18 pops open the steel ball 38 to release the gas. The pressure is relieved by releasing the gas, thereby preventing explosion and playing a safety protection role.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An overpressure protection device for a pressure reducing valve, comprising a main cylinder (1), characterized in that: The top of the main cylinder body (1) is fixedly connected with a cover plate (2), the bottom of the cover plate (2) is provided with a cylinder cover (3), the inner wall of the main cylinder body (1) is provided with an annular groove corresponding to the cylinder cover (3), the top of the cylinder cover (3) is slidably inserted with a fixing screw (4), the top of the fixing screw (4) is slidably sleeved with a limit plate (36), the fixing screw (4) is threadedly sleeved with a fixing bolt (5), the fixing screw (4) is sleeved with a first spring (6), and the two ends of the first spring (6) are respectively against the cover plate (2) and the cylinder cover (3); Two symmetrically arranged fixing blocks (7) are fixedly connected inside the main cylinder body (1), a pressure relief rod (9) is rotatably connected between the two fixing blocks (7) via a rotating shaft (8), a support block (10) is fixedly connected to the bottom of the fixing screw rod (4), a plug hole corresponding to the pressure relief rod (9) is provided on the support block (10), a vent (11) is provided at the bottom of the main cylinder body (1), a pressure relief port (12) communicating with the main cylinder body (1) is provided on the inner wall of the vent (11), a fixing plug (13) corresponding to the pressure relief port (12) is fixedly inserted at one end of the pressure relief rod (9) away from the support block (10), an air outlet head (14) is fixedly inserted at one end of the vent (11), and an air inlet head (15) is fixedly inserted at one end of the vent (11) away from the air outlet head (14); The bottom of the main cylinder body (1) near one end of the air inlet head (15) is provided with a mounting port (16) which is communicated with the vent (11); a baffle (17) corresponding to the mounting port (16) is fixedly connected to the outer wall of the main cylinder body (1); a pressure relief steel ball assembly (18) is threadedly inserted into the end of the main cylinder body (1) away from the baffle (17); a piston rod (19) is slidably inserted into the mounting port (16); one end of the piston rod (19) located in the vent (11) is sleeved with a second spring (20); the two ends of the second spring (20) are respectively against the inner walls of the piston rod (19) and the pressure relief steel ball assembly (18); One end of the piston rod (19) away from the vent (11) is fixedly connected to a transmission block (37); a side of the transmission block (37) away from the piston rod (19) is provided with a transmission groove (21); a push rod (22) is slidably connected to the transmission groove (21); one end of the push rod (22) penetrates the inner wall of the transmission groove (21) and is fixedly connected to a button (23); a third spring (24) is sleeved on the push rod (22); two ends of the third spring (24) are respectively fixedly connected to the button (23) and the inner wall of the transmission groove (21); A control port (25) is provided at the bottom of one end of the vent (11) close to the outlet head (14); a fixing plate (26) corresponding to the control port (25) is fixedly connected to the outer wall of the main cylinder body (1); an adjusting rod (27) is slidably inserted on the fixing plate (26); and a first sealing ring (28) is fixedly sleeved on one end of the adjusting rod (27) located in the control port (25).

2. An overpressure protection device for a pressure reducing valve according to claim 1, characterized in that: The cover plate (2) and the edge of the cylinder head (3) are fixedly connected via a plurality of first fastening bolts (29).

3. The overpressure protection device of a pressure reducing valve according to claim 1, characterized in that: The baffle (17) is fixedly connected to the inner wall of the installation opening (16) via a plurality of second fastening bolts (30).

4. The overpressure protection device of a pressure reducing valve according to claim 1, characterized in that: The fixing plate (26) is fixedly connected to the outer wall of the main cylinder body (1) via a plurality of third fastening bolts (31).

5. The overpressure protection device of a pressure reducing valve according to claim 1, characterized in that: One end of the air inlet head (15) located in the air vent (11) is fixedly sleeved with a fourth sealing ring (32).

6. The overpressure protection device of a pressure reducing valve according to claim 1, characterized in that: One end of the air outlet head (14) located in the air vent (11) is fixedly sleeved with a second sealing ring (33).

7. The overpressure protection device of a pressure reducing valve according to claim 1, characterized in that: One end of the pressure relief steel ball assembly (18) located in the installation opening (16) is fixedly sleeved with a third sealing ring (34).

8. The overpressure protection device of a pressure reducing valve according to claim 1, characterized in that: One end of the push rod (22) away from the button (23) is in a trapezoidal shape.

9. The overpressure protection device of a pressure reducing valve according to claim 1, characterized in that: A plurality of screw columns (35) are fixedly connected to the bottom of the main cylinder body (1), and a fixing opening is provided at the bottom of the screw column (35).

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