CN110206920B - Self-operated pressure reducing valve with overpressure safety cut-off function - Google Patents
Self-operated pressure reducing valve with overpressure safety cut-off function Download PDFInfo
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- CN110206920B CN110206920B CN201910343499.9A CN201910343499A CN110206920B CN 110206920 B CN110206920 B CN 110206920B CN 201910343499 A CN201910343499 A CN 201910343499A CN 110206920 B CN110206920 B CN 110206920B
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 59
- 238000005520 cutting process Methods 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 230000006837 decompression Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention aims to provide a self-operated pressure reducing valve with an overpressure safety cutoff function, which has both a pressure reducing function and a cutoff function. The self-operated pressure reducing valve with the overpressure safety cutoff function comprises a valve body, wherein an upstream channel and a downstream channel are formed in the valve body, the upstream channel is connected with an upstream pipe, the downstream channel is connected with a downstream pipe, the upstream channel is communicated with the downstream channel through a connecting channel, the valve body is connected with a pressure reducing valve part and a cut-off valve part, the downstream pipe is communicated with an inner cavity of the pressure reducing valve part through a first branch pipe, and a first spring diaphragm assembly and a first valve rod are arranged in the pressure reducing valve part; the shut-off valve portion comprises a first shut-off valve portion and a second shut-off valve portion, a second valve rod is arranged in an inner cavity of the first shut-off valve portion, a flow guide channel is arranged between the first shut-off valve portion and an upstream pipe, a second spring diaphragm assembly is arranged in the second shut-off valve portion, and the downstream pipe is communicated with the inner cavity of the second shut-off valve portion through a third branch pipe.
Description
Technical Field
The invention relates to a self-operated pressure reducing valve, in particular to a self-operated pressure reducing valve with overpressure safety cutoff function, which has both pressure reducing function and cutoff function.
Background
The self-operated pressure reducing valve adopts the movement of an opening and closing part in a control valve body to regulate the flow of a medium, reduces the pressure of the medium, and simultaneously regulates the opening degree of the opening and closing part by the action of the pressure behind the valve, so that the pressure behind the valve is kept in a certain range to protect downstream components. The existing pressure reducing valve only has the pressure reducing function and does not have the cutting-off function of the medium in the valve body. The prior pressure reducing valve comprises a valve body, a connecting rod, an inner cavity, a spring, a diaphragm, a valve core, an air inlet and an air outlet, wherein the air inlet and the air outlet are arranged on two sides of the valve body, the valve core is arranged between the air inlet and the air outlet in the valve body, and the diaphragm is touched by a medium to realize movement of the connecting rod, so that the valve core is driven to move to realize pressure reducing operation.
After the overpressure, the valve body can not be closed, the medium with the pressure exceeding the standard continuously enters the downstream pipe, the discharging capacity of the breather valve and the emergency discharging valve is still insufficient for discharging the medium, and when the pressure reaches a certain value along with the continuous rising of the pressure, the storage tank and other components connected with the downstream pipe can be damaged.
The valve generally comprises a valve body, a channel and a valve rod capable of axially moving are formed in the valve body, and a valve core for cutting off the channel is arranged on the valve rod.
Disclosure of Invention
The invention aims to provide a self-operated pressure reducing valve with an overpressure safety cutoff function, which has both a pressure reducing function and a cutoff function.
In order to achieve the above purpose, the invention adopts the following technical scheme: the self-operated pressure reducing valve with the overpressure safety cutoff function comprises a valve body, wherein an upstream channel and a downstream channel are formed in the valve body, the upstream channel is connected with an upstream pipe, the downstream channel is connected with a downstream pipe, the upstream channel is communicated with the downstream channel through a connecting channel, the valve body is connected with a pressure reducing valve part and a cut-off valve part, the downstream pipe is communicated with an inner cavity of the pressure reducing valve part through a first branch pipe, a first spring diaphragm assembly and a first valve rod are arranged in the pressure reducing valve part, the first spring diaphragm assembly comprises a first diaphragm and a first reset spring, the first diaphragm is in linkage with the first valve rod, and the first reset spring is compressed to enable the first valve rod to axially move so as to reduce the cross section area of the upstream channel for medium to pass through; the utility model discloses a high-pressure air conditioner, including the valve portion of cutting off, the valve portion of cutting off includes first valve portion of cutting off and second valve portion of cutting off, be equipped with the second valve rod in the inner chamber of first valve portion of cutting off, the one end that the second valve rod is located first valve portion of cutting off is fixed with the stopper, be equipped with the water conservancy diversion passageway between first valve portion of cutting off and the upstream pipe, the road passageway includes the second branch pipe with the upstream pipe intercommunication, be equipped with the second spring diaphragm subassembly in the second valve portion of cutting off, the downstream pipe passes through the inner chamber intercommunication of third branch pipe and second valve portion of cutting off, the second spring diaphragm subassembly includes second diaphragm, second reset spring, second diaphragm and third valve rod linkage, second reset spring is compressed in order to make third valve rod axial displacement in order to open the water conservancy diversion passageway, and the water conservancy diversion passageway is opened in order to make the medium in the upstream pipe promote the second valve rod removal in order to seal the connecting channel after the water conservancy diversion passageway.
When the valve is normally used, a medium sequentially passes through the upstream pipe, the valve body and the downstream pipe, and when the medium is over-pressurized, the medium entering the inner cavity of the pressure reducing valve part is more and the pressure is higher, so that the first diaphragm in the first spring diaphragm assembly is deformed, the first valve rod moves towards the side of the connecting pipeline, the sectional area of the upstream pipeline for the medium to pass through is reduced, and the pressure reducing function is realized; after the pressure is reduced, if the downstream pipe is still in excess pressure, the medium enters the inner cavity of the second cut-off valve part to push the second diaphragm and compress the second spring so as to drive the third valve rod to move, so that a pipeline between the upstream pipe and the inner cavity of the first cut-off valve part is opened, the medium in the upstream pipe enters the inner cavity of the first cut-off valve part, and the overpressure medium of the upstream pipe pushes the second valve rod to move so as to realize the sealing of a connecting pipeline of the valve body, so that the cutting-off function of the valve body is realized. The pressure of the medium in the downstream pipe is reduced, the second diaphragm is reset under the action of the second reset spring and drives the third valve rod to reset, so that the sealing of the diversion channel is realized, the pushing of the medium in the upstream pipe is lost, and the second valve rod can be reset; meanwhile, when the pressure of the medium in the downstream pipe is reduced, the pressure of the medium entering the pressure reducing valve part is reduced, and under the action of the first return spring, the first diaphragm is gradually reset, so that the first valve rod is gradually reset, and the sectional area of the upstream channel for the medium to pass through is gradually increased.
Preferably, a pre-tightening spring is sleeved on the second valve rod, one end of the pre-tightening spring is fixed with the limiting block, and the other end of the pre-tightening spring is close to the side of the connecting channel and is fixed with the first cut-off valve portion. The pre-tightening spring provides certain auxiliary force so that the second valve rod can move more timely, and the connecting pipeline of the valve body is closed. It is known to provide a spring seat to secure the ends of the spring.
Preferably, the first cut-off valve part is provided with a drain hole and is matched with a plug; the limiting block divides the inner cavity of the first cut-off valve part into two mutually independent spaces, and when the diversion channel is conducted, the medium in the inner cavity of the second cut-off valve part pushes the limiting block so as to push the second valve rod to axially move; when the diversion channel is closed, the medium in the upstream channel of the valve body pushes the second valve rod to reset. The limiting block is not only used for preventing the second valve rod from being separated from the first cut-off valve part, but also plays a role of a piston, and the overpressure medium pushes the limiting block to realize movement of the second valve rod. The drain hole is used for discharging the medium entering the first cut-off valve part from the upstream pipe so as to facilitate the medium in the pipeline upstream of the valve body to push the second valve rod to reset. Wherein, can open the drain hole through manual mode, also can realize the opening of drain hole through the mode that sets up the solenoid valve.
Preferably, the valve body is provided with a first slot and a second slot, the first slot is connected with the upstream channel, the second slot is connected with the downstream channel, the pressure reducing valve part is fixed at the first slot, the first cutting valve part is fixed at the second slot, the first slot and the second slot are arranged on one of two opposite sides of the valve body, and the first valve rod, the second valve rod and the connecting channel are coaxially arranged. The valve body is more convenient to process, and the second valve rod is more convenient to reset.
Preferably, a first connecting rod is fixed on the first diaphragm, the first connecting rod is linked with the first valve rod through a first connecting rod mechanism, the first valve rod is located in a guide groove of the guide block, the first diaphragm deforms to enable the first valve rod to axially move along the guide groove of the guide block, and the guide block, the pressure reducing valve portion and the valve body are fixed.
The spring diaphragm assembly is of an existing structure, and a fixing mode of the first connecting rod and a fixing mode of the first reset spring are selected according to requirements. The guide block and the pressure reducing valve part are mutually independent parts, and the guide block can be made of other materials different from the material of the pressure reducing valve part.
Preferably, the pressure reducing valve portion is provided with a first annular boss, a first slot communicated with the upstream channel is formed in the valve body, the first slot is thick and thin to form a step structure, the guide block is provided with a convex ring extending outwards in the circumferential direction, and the first boss is fixed with the valve body to limit the convex ring of the guide block between the first boss and the first slot step surface of the valve body. The outer convex ring of the guide block is tightly pressed to fix the guide block, the valve body and the pressure reducing valve part, and the guide block is more convenient to fix.
Preferably, the first connecting rod mechanism comprises a first fixed rod and a first movable rod, the first fixed rod is fixed with the guide block, the first connecting rod, the first fixed rod and the first valve rod are vertically arranged, the first movable rod is rotatably fixed with the first fixed rod at the parts of the left end and the right end, which deviate from each other, the two ends of the first movable rod are respectively linked with the first connecting rod and the first valve rod, the end parts of the first connecting rod and the end parts of the first valve rod are vertically provided with linkage columns, the two ends of the first movable rod are provided with strip-shaped grooves, the strip-shaped grooves are arranged along the axis of the first movable rod, and the linkage columns are matched in the strip-shaped grooves.
The first fixing rod is fixed with the guide block, so that the manufacture and the processing of the pressure reducing valve part are more convenient. When the first connecting rod moves up and down, the linkage column of the first connecting rod drives one of the left end and the right end of the first movable rod to move up and down, so that the other end of the left end and the right end of the first movable rod moves in opposite directions, and linkage of the first valve rod is realized.
Preferably, a second connecting rod is fixed on the second diaphragm, the second connecting rod is linked with the third valve rod through a second connecting rod mechanism, a third cut-off valve part is arranged on the side of the second cut-off valve part, the flow guide channel comprises a third cut-off valve part and a fourth branch pipe connected with an upstream pipe and connected with the second branch pipe, the third cut-off valve part and the first cut-off valve part, and the third valve rod moves axially to conduct or cut off an inner cavity pipeline of the third cut-off valve part.
The spring diaphragm assembly is of an existing structure, and a fixing mode of the second connecting rod and a fixing mode of the second reset spring are selected according to requirements. The third valve rod is used for acting on the third cut-off valve part, so that the structure of parts of the second cut-off valve part is simpler, and the production and the processing of the second cut-off valve part are more convenient.
Preferably, the inner cavity pipeline of the third cut-off valve part is provided with a break-off groove for dividing the inner cavity pipeline into a front section and a rear section, an opening communicated with the front section of the inner cavity pipeline and another opening communicated with the rear section of the inner cavity pipeline are formed in the groove wall of the break-off groove, and the second return spring drives the second diaphragm to return so that the third valve shaft moves axially to close one of the two openings. The mode of closing the opening is more convenient and more labor-saving than the mode of cutting off the open slot, so that the movement of the third valve rod is more convenient, and the movement of the second valve rod is more timely.
Preferably, a valve block is fixed in the valve body, the valve block is provided with a connecting channel, annular protrusions are formed at two opposite ends of the valve block, annular sealing gaskets are arranged on the axial end faces of the first valve rod and the second valve rod, the outer diameter of each sealing gasket is larger than that of each annular protrusion, and the second valve rod seals the connecting channel so that the sealing gaskets are propped against the annular protrusions. The valve block and the valve body are mutually independent parts, and the valve block is independently processed, so that the connection channel of the valve body is easier to cut off.
The invention has the advantages of both decompression function and cutting function.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic structural view of the present invention.
Fig. 3 is a schematic view of a structure of the pressure reducing valve portion and the valve body of the present invention.
Fig. 4 is a schematic structural view of the first shutoff valve portion and the valve body of the present invention.
Fig. 5 is a schematic view of a structure of the second shut-off valve portion and the third shut-off valve portion of the present invention.
Fig. 6 is a schematic view of a valve block according to the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific embodiments.
As shown in fig. 1 to 5, the self-operated pressure reducing valve with an overpressure safety shut-off function of the present invention comprises a valve body 1, wherein an upstream channel 11 and a downstream channel 12 are formed in the valve body 1, the upstream channel 11 is connected with an upstream pipe 13, the downstream channel 12 is connected with a downstream pipe 14, the upstream channel 11 is communicated with the downstream channel 12 through a connecting channel 20, and the valve body 1 is connected with a pressure reducing valve part 3 and a shut-off valve part.
The downstream pipe 14 is communicated with the inner cavity of the pressure reducing valve part 3 through the first branch pipe 15, the pressure reducing valve part 3 is internally provided with a first spring diaphragm assembly and a first valve rod 31, the first spring diaphragm assembly comprises a first diaphragm 32 and a first return spring 33, the first diaphragm 32 is linked with the first valve rod 31, and the first return spring 33 is compressed to enable the first valve rod 31 to axially move so as to reduce the cross section area of the upstream channel 11 for passing medium. The shut-off valve part comprises a first shut-off valve part 4 and a second shut-off valve part 5, a second valve rod 41 is arranged in the inner cavity of the first shut-off valve part 4, a limiting block 42 is fixed at one end of the second valve rod 41 positioned in the first shut-off valve part 4, a diversion channel is arranged between the first shut-off valve part 4 and the upstream pipe 13, the road channel comprises a second branch pipe 40 communicated with the upstream pipe 13, a second spring diaphragm assembly is arranged in the second shut-off valve part 5, the downstream pipe 14 is communicated with the inner cavity of the second shut-off valve part 5 through a third branch pipe 50, the second spring diaphragm assembly comprises a second diaphragm 52 and a second return spring 53, the second diaphragm 52 is linked with the third valve rod 51, the second return spring 53 is compressed to enable the third valve rod 51 to axially move to open the diversion channel, and after the diversion channel is opened to enable media in the upstream pipe 13 to push the second valve rod 41 to move to close the connecting channel 20 through the diversion channel.
As shown in fig. 2, 3, 4 and 6, the valve body 1 of the present embodiment is formed with a first slot and a second slot at the upper and lower ends thereof, the first slot is connected with the upstream channel 11, the second slot is connected with the downstream channel 12, the pressure reducing valve portion 3 is fixed at the first slot and located at the upper side of the valve body 1, the first cut-off valve portion 4 is fixed at the second slot and located at the lower side of the valve body 1, the first slot and the second slot are disposed at one of the upper and lower opposite sides of the valve body 1, the first valve rod 31, the second valve rod 41 and the connecting channel 20 are coaxially disposed, the upstream pipe 13 is located at the right side of the valve body 1, and the downstream pipe 14 is located at the left side of the valve body 1. The valve body 1 is internally provided with a valve block 2, the valve block 2 is in threaded fixation with the valve body, the valve block 2 is provided with a connecting channel 20 penetrating up and down, annular protrusions 21 are formed at the upper end and the lower end of the valve block 2, annular sealing gaskets 22 are arranged on the axial end faces of the first valve rod 31 and the second valve rod 41, the outer diameter of each sealing gasket 22 is larger than that of each annular protrusion 21, and the second valve rod 41 seals the connecting channel 20 so that the sealing gaskets 20 are propped against the axial faces of the annular protrusions 21.
As shown in fig. 2 and 4, the second valve rod 41 is sleeved with a pre-tightening spring 43, the lower end of the pre-tightening spring 43 is fixed with a limiting block 42, and the upper end of the pre-tightening spring 43 is close to the connecting channel and fixed with the first cut-off valve part 4. Wherein, the stopper and the first shut-off valve part are provided with spring seats (not shown) for cooperating with the stopper springs 43. The limiting block 42 divides the inner cavity of the first cut-off valve part 4 into two mutually independent spaces, and when the diversion channel is conducted, the medium in the inner cavity of the second cut-off valve part 5 pushes the limiting block 42 so as to push the second valve rod 41 to move upwards and axially; when the diversion channel is closed, the medium of the upstream channel 13 of the valve body 1 pushes the second valve rod 41 to move downwards to reset. Wherein the first shut-off valve 4 is provided with a drain hole and is fitted with a plug 49.
As shown in fig. 2 and 3, the casing of the pressure reducing valve portion of the present embodiment is formed by an upper portion and a lower portion, the outer edge of the first diaphragm 32 is clamped and fixed between the upper portion and the lower portion of the casing of the pressure reducing valve portion 3, the upper side and the lower side of the first diaphragm 32 are respectively provided with a fixed tray 82 and a fixed sheet 81, the fixed tray 82 and the center of the first diaphragm 32 are respectively provided with a through hole and are matched with the first connecting rod 34, and the fixed tray 82, the first diaphragm 32 and the fixed sheet 81 are in threaded fit with the first connecting rod 34 through two locking nuts 83 so as to be limited between the boss and the locking nut on the first connecting rod 34. The upper part of the casing of the pressure reducing valve part is formed with a cylindrical structure, the lower end of the first return spring 33 is positioned on the fixed tray 82, and the upper end of the first return spring 33 is positioned in the cylindrical structure.
The lower end of the first connecting rod 34 is linked with the first valve rod 31 through a first connecting rod mechanism, the first valve rod 31 is positioned in the guide groove 550 of the guide block 35, the first diaphragm 32 deforms to enable the first valve rod 31 to axially move along the guide groove 550 of the guide block 35, and the guide block 35 is fixed with the pressure reducing valve part 3 and the valve body 1. The pressure reducing valve portion 3 is provided with a first boss 36 in the shape of a ring, the first groove is rough and fine to form a stepped structure, the guide block 35 is formed with a convex ring 351 extending outward in the circumferential direction, and the first boss 36 is fixed with the valve body 1 to restrict the convex ring 351 of the guide block 35 between the first boss 36 and the first grooved stepped surface of the valve body 1.
The first connecting rod mechanism comprises a first fixed rod 37 and a first movable rod 38, the first fixed rod 37 is fixed with the guide block 35, the first connecting rod 34, the first fixed rod 37 and the first valve rod 31 are vertically arranged, the first movable rod 38 is rotatably fixed with the first fixed rod 37 at the left end and the right end of the first movable rod 38 in a deviating mode, the left end and the right end of the first movable rod 38 are respectively linked with the first connecting rod 34 and the first valve rod 31, first linkage columns 39 are vertically arranged at the end portions of the first connecting rod 34 and the first valve rod 31, strip-shaped grooves are formed in the two ends of the first movable rod 38, the strip-shaped grooves are arranged along the axis of the first movable rod 38, and each first linkage column is matched in one strip-shaped groove.
As shown in fig. 2 and 5, the housing of the second shut-off valve portion of the present embodiment is formed by an upper portion and a lower portion, the outer edge of the second diaphragm 52 is clamped and fixed between the upper portion and the lower portion of the housing of the second shut-off valve portion 5, the upper side and the lower side of the second diaphragm 52 are respectively provided with a fixing piece 81 and a fixing tray 82, through holes are formed at the centers of the fixing piece 81, the fixing tray 82 and the second diaphragm 52, and the second connecting rod 54 is matched, and the second connecting rod 54 passes through the fixing tray 82, the second diaphragm 52 and the fixing piece 81 and then is matched with the two locking nuts 83, so that the fixing tray 82, the second diaphragm 52 and the fixing piece 81 are limited between the boss of the second connecting rod 54 and the locking nuts. The lower part of the housing of the second shut-off valve section 5 is formed with a cylindrical structure, the upper end of the second return spring 53 is located on the fixed tray 82, and the lower end of the second return spring 53 is located in the cylindrical structure.
The second connecting rod 54 is linked with the third valve rod 51 by a second link mechanism, the third shut-off valve portion 6 is provided on the right side of the second shut-off valve portion 5, the diversion channel includes the second branch pipe 40 in which the third shut-off valve portion 6 is connected with the upstream pipe 13, and the fourth branch pipe 60 in which the third shut-off valve portion 6 is connected with the first shut-off valve portion 4, and the third valve rod 51 moves axially to conduct or shut off the lumen line 6 of the third shut-off valve portion 6. The inner cavity pipeline 61 of the third shut-off valve part 6 is provided with a break-off groove 62 for dividing the inner cavity pipeline 61 into a front section and a rear section, one opening communicated with the front section of the inner cavity pipeline 61 and the other opening communicated with the rear section of the inner cavity pipeline 62 are formed on the wall of the break-off groove 62, and the second return spring 53 drives the second diaphragm 52 to return so as to enable the third valve rod 41 to axially move to close one of the two openings.
The second link mechanism comprises an L-shaped linkage piece 56, a third valve rod 51 and a second connecting rod 54 are vertically arranged, a part of the L-shaped linkage piece 56 deviating from two ends is rotatably fixed with the upper part of the second cut-off valve part 5 shell, a strip-shaped groove arranged along the left-right direction is formed at the left end of the third valve rod 51, a strip-shaped groove is formed at the right end of the L-shaped linkage piece 56, a second linkage column 57 is arranged at the left end of the third valve rod 51, the second linkage column 57 is matched with the strip-shaped groove of the L-shaped linkage piece 56, an included angle formed by the L-shaped linkage piece 56 is opened upwards, two third linkage columns 58 are arranged on the second connecting rod 54, and the left end of the L-shaped linkage piece 56 is positioned between the upper linkage column 58 and the lower linkage column 58.
When the pressure reducing valve is used, a medium sequentially passes through the upstream pipe, the valve body and the downstream pipe, and when the medium is in overpressure, the medium entering the inner cavity of the pressure reducing valve part is more and the pressure is higher, so that the first diaphragm in the first spring diaphragm assembly is deformed, the first return spring is compressed, the first valve rod is downwards moved by the first connecting rod mechanism, the cross section area of the upstream pipe for the medium to pass through is reduced, and the pressure reducing function is realized; after decompression or the decompression part is in fault, when the medium in the second cut-off valve part is still in an overpressure state, the overpressure medium can press the second diaphragm and the second spring to drive the third valve rod to move leftwards through the second connecting rod mechanism, so that a diversion channel between the upstream pipe and the inner cavity of the first cut-off valve part is opened, the medium in the upstream pipe enters the inner cavity of the first cut-off valve part, and the overpressure medium of the upstream pipe pushes the second valve rod to move upwards to realize the sealing of a connecting pipeline of the valve body, so that the cutting-off function of the valve body is realized.
After the valve body is cut off, when the medium pressure in the downstream pipe becomes smaller, namely when the downstream medium pressure is restored to be below a normal value, the second diaphragm drives the second connecting rod to reset under the action of the second reset spring, so that the third valve rod resets to cut off the diversion channel, the second valve rod is not subjected to upward thrust any more, and the second valve rod resets to enable the valve body to be opened under the influence of the impact of the pipeline medium at the upstream of the valve body and the self gravity. Meanwhile, when the pressure of the downstream medium is reduced, the pressure of the medium in the inner cavity of the pressure reducing valve part is also reduced, and under the action of the first return spring, the first diaphragm and the first connecting rod are reset to realize the reset of the first valve rod, so that the sectional area of the upstream channel of the valve body for the medium to pass through is gradually increased, and when the pressure of the upstream medium is in a normal range value, the sectional area of the upstream channel of the valve body for the medium to pass through is maximum. Wherein the second valve stem is reset to the original position by opening the drain hole.
The invention has the advantages of both decompression function and cutting function.
Claims (10)
1. The self-operated pressure reducing valve with the overpressure safety cutoff function is characterized by comprising a valve body, wherein an upstream channel and a downstream channel are formed in the valve body, the upstream channel is connected with an upstream pipe, the downstream channel is connected with a downstream pipe, the upstream channel is communicated with the downstream channel through a connecting channel, the valve body is connected with a pressure reducing valve part and a cut-off valve part, the downstream pipe is communicated with an inner cavity of the pressure reducing valve part through a first branch pipe, a first spring diaphragm assembly and a first valve rod are arranged in the pressure reducing valve part, the first spring diaphragm assembly comprises a first diaphragm and a first return spring, the first diaphragm is linked with the first valve rod, and the first return spring is compressed to enable the first valve rod to axially move so as to reduce the cross section area of the upstream channel for medium to pass through; the utility model discloses a high-pressure air conditioner, including the valve portion of cutting off, the valve portion of cutting off includes first valve portion of cutting off and second valve portion of cutting off, be equipped with the second valve rod in the inner chamber of first valve portion of cutting off, the one end that the second valve rod is located first valve portion of cutting off is fixed with the stopper, be equipped with the water conservancy diversion passageway between first valve portion of cutting off and the upstream pipe, the road passageway includes the second branch pipe with the upstream pipe intercommunication, be equipped with the second spring diaphragm subassembly in the second valve portion of cutting off, the downstream pipe passes through the inner chamber intercommunication of third branch pipe and second valve portion of cutting off, the second spring diaphragm subassembly includes second diaphragm, second reset spring, second diaphragm and third valve rod linkage, second reset spring is compressed in order to make third valve rod axial displacement in order to open the water conservancy diversion passageway, and the water conservancy diversion passageway is opened in order to make the medium in the upstream pipe promote the second valve rod removal in order to seal the connecting channel after the water conservancy diversion passageway.
2. The self-operated pressure reducing valve with the overpressure safety cutoff function according to claim 1, wherein a pre-tightening spring is sleeved on the second valve rod, one end of the pre-tightening spring is fixed with the limiting block, and the other end of the pre-tightening spring is close to the side of the connecting channel and is fixed with the first cutoff valve part.
3. The self-operated pressure reducing valve with an overpressure safety shut-off function according to claim 1, characterized in that the first shut-off valve part is provided with a drain hole and fitted with a plug; the limiting block divides the inner cavity of the first cut-off valve part into two mutually independent spaces, and when the diversion channel is conducted, the medium in the inner cavity of the second cut-off valve part pushes the limiting block so as to push the second valve rod to axially move; when the diversion channel is closed, the medium in the upstream channel of the valve body pushes the second valve rod to reset.
4. The self-operated pressure reducing valve with an overpressure safety cutoff function according to claim 1, wherein the valve body is formed with a first slot and a second slot, the first slot is connected with the upstream channel, the second slot is connected with the downstream channel, the pressure reducing valve portion is fixed at the first slot, the first cutoff valve portion is fixed at the second slot, the first slot and the second slot are disposed on one of opposite sides of the valve body, and the first valve rod is coaxially disposed with the second valve rod and the connecting channel.
5. The self-operated pressure reducing valve with an overpressure safety cutoff function according to claim 1, wherein a first connecting rod is fixed on the first diaphragm, the first connecting rod is linked with the first valve rod through a first connecting rod mechanism, the first valve rod is positioned in a guide groove of a guide block, the first diaphragm deforms to enable the first valve rod to axially move along the guide groove of the guide block, and the guide block is fixed with the pressure reducing valve part and the valve body.
6. The self-operated pressure reducing valve with overpressure safety cutoff function according to claim 5, wherein the pressure reducing valve portion is provided with a first boss in a ring shape, a first slot communicated with the upstream channel is formed in the valve body, the first slot is thick and thin to form a stepped structure, the guide block is formed with a convex ring extending outwards in the circumferential direction, and the first boss is fixed with the valve body to limit the convex ring of the guide block between the first boss and the first slotted step surface of the valve body.
7. The self-operated pressure reducing valve with an overpressure safety cutoff function according to claim 5, wherein the first connecting rod mechanism comprises a first fixed rod and a first movable rod, the first fixed rod is fixed with the guide block, the first connecting rod, the first fixed rod and the first valve rod are vertically arranged, the first movable rod is rotatably fixed with the first fixed rod at the parts deviating from the left end and the right end, the two ends of the first movable rod are respectively linked with the first connecting rod and the first valve rod, the ends of the first connecting rod and the ends of the first valve rod are respectively and vertically provided with a linkage column, the two ends of the first movable rod are provided with a strip-shaped groove, the strip-shaped groove is arranged along the axis of the first movable rod, and the linkage column is matched in the strip-shaped groove.
8. The self-operated pressure reducing valve with an overpressure safety cutoff function according to claim 1, wherein a second connecting rod is fixed on the second diaphragm, the second connecting rod is linked with the third valve rod through a second connecting rod mechanism, a third cutoff valve part is arranged on the side of the second cutoff valve part, the diversion channel comprises a second branch pipe connected with an upstream pipe by the third cutoff valve part and a fourth branch pipe connected between the third cutoff valve part and the first cutoff valve part, and the third valve rod axially moves to conduct or cut off an inner cavity pipeline of the third cutoff valve part.
9. The self-operated pressure reducing valve with overpressure safety cutoff function according to claim 8, wherein the inner cavity pipeline of the third cutoff valve part is provided with an on-off groove for dividing the inner cavity pipeline into a front section and a rear section, one opening communicated with the front section of the inner cavity pipeline and the other opening communicated with the rear section of the inner cavity pipeline are formed on the wall of the on-off groove, and the second return spring drives the second diaphragm to return so as to enable the third valve shaft to axially move to close one of the two openings.
10. The self-operated pressure reducing valve with an overpressure safety cutoff function according to claim 4, wherein a valve block is fixed in the valve body, the valve block is formed with the connecting channel, annular protrusions are formed at opposite ends of the valve block, annular sealing gaskets are arranged on axial end faces of the first valve rod and the second valve rod, the outer diameter of the sealing gaskets is larger than that of the annular protrusions, and the second valve rod seals the connecting channel to enable the sealing gaskets to abut against the annular protrusions.
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| CN201910343499.9A CN110206920B (en) | 2019-04-26 | 2019-04-26 | Self-operated pressure reducing valve with overpressure safety cut-off function |
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| CN110206920B true CN110206920B (en) | 2023-09-15 |
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|---|---|
| CN110206920A (en) | 2019-09-06 |
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