CN110604895B - High-low pressure automatic switching fire control shower nozzle - Google Patents
High-low pressure automatic switching fire control shower nozzle Download PDFInfo
- Publication number
- CN110604895B CN110604895B CN201910902089.3A CN201910902089A CN110604895B CN 110604895 B CN110604895 B CN 110604895B CN 201910902089 A CN201910902089 A CN 201910902089A CN 110604895 B CN110604895 B CN 110604895B
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- Prior art keywords
- pressure
- low
- channel
- nozzle
- main
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- 239000012530 fluid Substances 0.000 claims abstract description 51
- 238000004891 communication Methods 0.000 claims abstract description 16
- 239000007921 spray Substances 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
- A62C31/03—Nozzles specially adapted for fire-extinguishing adjustable, e.g. from spray to jet or vice versa
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/28—Accessories for delivery devices, e.g. supports
Landscapes
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Nozzles (AREA)
Abstract
The invention discloses a high-low pressure automatic switching fire-fighting nozzle, which comprises a nozzle main body, wherein the nozzle main body is provided with a main channel, a low-pressure channel and a high-pressure channel, and the low-pressure channel is communicated with the main channel; the high-pressure channel is communicated with the main channel through a valve hole, and a low-pressure nozzle and a high-pressure nozzle are correspondingly arranged on the nozzle main body; a main valve core is maintained by a first elastic device to seal the valve hole, and when the pressure of fluid in the main channel is greater than a preset value, the main valve core can be pushed to move to open the valve hole; the spray head main body is internally provided with a piston cavity which is communicated with the low-pressure channel through a communication hole; the head of a switching piece is matched with the piston cavity and is arranged in the piston cavity in a sliding way, the switching piece can be pushed by the fluid in the piston cavity to block the low-pressure channel, and a second elastic device for pushing the switching piece to reset is arranged on the sprayer main body. The invention can automatically switch the corresponding high-pressure nozzle and low-pressure nozzle to work according to the pressure of the fluid, and is more flexible and convenient to use.
Description
Technical Field
The invention relates to the field of fire-fighting facilities, in particular to a fire-fighting nozzle.
Background
The fire-fighting nozzle is mainly used for spraying fire-extinguishing media such as gas, fire extinguishing agent and the like, is a common component in a fire-fighting system, the existing fire-fighting nozzle can be generally divided into a high-pressure nozzle, a medium-pressure nozzle and a low-pressure nozzle according to the working pressure of the fire-fighting nozzle, wherein the kinetic energy of fog drops generated by the high-pressure nozzle and the medium-pressure nozzle is larger, the impact on the root of flame can be generated, the fire-fighting nozzle has the advantages of good atomization effect, high fire-extinguishing performance and the like, and the low-pressure nozzle has relatively poor atomization effect, but has lower requirement on a pump group. In the partial area, the condition that high-pressure water mist or low-pressure water mist needs to be selected and used according to the needs exists, and therefore two sets of pipeline systems and pump sets are usually needed to be equipped, and the high-pressure spray head and the low-pressure spray head are installed at the same time, so that the structure is complex, the cost is high, in addition, the partial high-pressure water mist system adopts a bottle body and other storage type pressure sources, and the condition that the pressure is insufficient after long-time use or idling can occur, so that the high-pressure spray head cannot be started by utilizing the pressure of the pressure source, the fire extinguishing function is completely lost, and a certain potential safety hazard exists.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides the high-low pressure automatic switching fire-fighting nozzle which is flexible and convenient to use, can reduce the cost of fire-fighting facilities and enhance the reliability.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the high-low pressure automatic switching fire-fighting nozzle comprises a nozzle main body, wherein the nozzle main body is provided with a main channel, a low-pressure channel and a high-pressure channel,
the low-pressure channel is communicated with the main channel, and a low-pressure nozzle matched with the low-pressure channel is arranged on the nozzle main body;
the high-pressure channel is communicated with the main channel through a valve hole, and a high-pressure nozzle matched with the high-pressure channel is arranged on the nozzle main body;
the main valve core is movably arranged on the nozzle main body and is maintained at a position for closing the valve hole by a first elastic device, and when the pressure of fluid in the main channel is larger than a preset value, the main valve core can be pushed to move until the valve hole is opened;
the spray head main body is internally provided with a piston cavity communicated with the high-pressure channel, and the piston cavity is communicated with the low-pressure channel through a communication hole; the head of a switching piece is matched with the piston cavity and is arranged in the piston cavity in a sliding way, the switching piece can be pushed by fluid entering the piston cavity from the high-pressure channel to move to enable the tail of the switching piece to be inserted into the low-pressure channel through the communication hole so as to block the low-pressure channel, and a second elastic device for pushing the switching piece to move towards the direction of opening the low-pressure channel is arranged on the sprayer main body.
Preferably, the cross-sectional area of the head of the switching member in the direction perpendicular to the moving direction of the switching member is larger than the cross-sectional area of the tail of the switching member in the direction perpendicular to the moving direction of the switching member.
Preferably, the cross section of the switching piece is T-shaped, the larger part of the switching piece is matched with the piston cavity, and the smaller part of the switching piece is matched with the communication hole and movably arranged in the communication hole in a penetrating way.
Preferably, the communication hole is located on one side wall of the low pressure channel, a positioning groove matched with the tail part of the switching piece is formed in the other side wall of the low pressure channel, and the switching piece can move under the pushing of fluid in the high pressure channel to enable the tail part of the switching piece to be inserted into the positioning groove.
Preferably, a low-pressure cyclone is arranged in the low-pressure nozzle.
Preferably, a high-pressure cyclone is arranged in the high-pressure nozzle.
Preferably, the number of the low-pressure nozzles is a plurality and the low-pressure nozzles are uniformly distributed around the high-pressure nozzles.
Preferably, a filter screen is arranged in the main channel.
Preferably, the valve hole is conical, the head shape of the main valve core is matched with the valve hole shape, the head of the main valve core can be inserted into the valve hole, and the outer wall of the main valve core is clung to the inner wall of the valve hole so as to seal the valve hole.
Preferably, the valve body is provided with a guide groove matched with the tail part of the main valve core, and the tail part of the main valve core is inserted in the guide groove and can move along the guide groove to enable the head part of the main valve core to move out of the valve hole so as to open the valve hole.
The beneficial effects of the invention are as follows: in the working process, when the pressure of fluid introduced into the main channel is smaller than a preset value, the fluid cannot push the main valve core to move, so that the main valve core can keep the valve hole closed, the fluid cannot enter the high-pressure channel through the valve hole, the head of the switching piece cannot be pushed by the fluid correspondingly, the second elastic device can keep the switching piece at a position for keeping the low-pressure channel open, and the fluid such as fire extinguishing agent or fire extinguishing gas in the main channel can be sprayed out from the low-pressure nozzle through the low-pressure channel; when the pressure of fluid introduced into the main channel is larger than a preset value, the fluid can push the main valve core to move to open the valve hole, so that the fluid can enter the high-pressure channel and then be sprayed out from the high-pressure nozzle, meanwhile, the fluid in the high-pressure channel can push the switching piece to move to block the low-pressure channel, the fluid is prevented from entering the low-pressure nozzle through the low-pressure channel, the main valve core can move to reclose the valve hole under the action of the first elastic device after the pressure of the fluid is reduced to the preset value or after the supply of the fluid is disconnected, and meanwhile, the switching piece can also move back to open the low-pressure channel under the action of the second elastic device, so that the fire-extinguishing device can automatically switch the corresponding high-pressure nozzle and the low-pressure nozzle according to the pressure of the fluid, is more flexible and convenient to use, can effectively reduce the fire-extinguishing facility cost for places where the requirements exist, has stronger applicability to both the high-pressure system and the low-pressure system, and in addition, when the high-pressure system is attenuated, the fire-extinguishing device can still be used through the low-pressure channel and the low-pressure nozzle to perform certain fire-extinguishing performance, and the fire-extinguishing performance can be effectively reduced.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is an overall block diagram of a preferred embodiment of the present invention;
FIG. 2 is an exploded view of a preferred embodiment of the present invention;
FIG. 3 is an enlarged partial view of portion A of FIG. 2;
FIG. 4 is a cross-sectional view of a preferred embodiment of the present invention in a low pressure state;
FIG. 5 is a cross-sectional view of a portion of the main body of the spray head in accordance with the preferred embodiment of the present invention;
fig. 6 is a cross-sectional view of the preferred embodiment of the present invention in a high pressure state.
Detailed Description
Referring to fig. 1 to 6, in a preferred embodiment of the present invention, a high-low pressure automatic switching fire control sprinkler includes a sprinkler body 10, the sprinkler body 10 having a main channel 20, a low pressure channel 30 and a high pressure channel 40, wherein the low pressure channel 30 is communicated with the main channel 20, and the sprinkler body 10 is provided with a low pressure nozzle 31 adapted to the low pressure channel 30; the high-pressure channel 40 is communicated with the main channel 20 through a valve hole 11, and a high-pressure nozzle 41 matched with the high-pressure channel 40 is arranged on the nozzle body 10; a main valve core 12 movably disposed on the nozzle body 10 and maintained at a position closing the valve hole 11 by a first elastic means 13, and the fluid in the main passage 20 can push the main valve core 12 to move to open the valve hole 11 when the pressure is greater than a predetermined value; the spray head body 10 has a piston chamber 14 therein which communicates with the high pressure passage 40, the piston chamber 14 communicating with the low pressure passage 30 through a communication hole 15; the head of a switching member 50 is slidably disposed in the piston chamber 14 in a state of being fitted to the piston chamber 14, and the switching member 50 is movable by a fluid flowing from the high pressure passage 40 into the piston chamber 14 to a state in which the tail of the switching member 50 is inserted into the low pressure passage 30 via the communication hole 15 to block the low pressure passage 30, and the head body 10 is provided with a second elastic means 51 for urging the switching member 50 to move in a direction of opening the low pressure passage 30. In the working process of the invention, when the pressure of the fluid introduced into the main channel 20 is smaller than a preset value, the fluid cannot push the main valve core 12 to move, so that the main valve core 12 can keep the sealing of the valve hole 11, the fluid cannot enter the high-pressure channel 40 through the valve hole 11, correspondingly, the head of the switching piece 50 cannot be pushed by the fluid, the second elastic device 51 can maintain the switching piece 50 at the position for keeping the low-pressure channel 30 open, and the fluid such as fire extinguishing agent or fire extinguishing gas in the main channel 20 can be sprayed out from the low-pressure nozzle 31 through the low-pressure channel 30; when the pressure of the fluid flowing into the main channel 20 is greater than a preset value, the fluid can push the main valve core 12 to move to open the valve hole 11, so that the fluid can enter the high-pressure channel 40 and then be sprayed out from the high-pressure nozzle 41, meanwhile, the fluid in the high-pressure channel 40 can push the switching piece 50 to move to block the low-pressure channel 30, so that the fluid is prevented from entering the low-pressure nozzle 31 through the low-pressure channel 30, the main valve core 12 can move to reclose the valve hole 11 under the action of the first elastic device 13 after the pressure of the fluid is reduced to be below the preset value or after the supply of the fluid is disconnected, and meanwhile, the switching piece 50 can also move back to open the low-pressure channel 30 under the action of the second elastic device 51, so that the corresponding high-pressure nozzle 41 and the low-pressure nozzle 31 can be automatically switched to operate according to the pressure of the fluid, the fire extinguishing system is more flexible and convenient to use, the fire extinguishing facility cost can be effectively reduced without being equipped with a high-pressure system and a low-pressure system at the same time, the fire extinguishing facility can be more applicable, the fire extinguishing facility can be applied to both the high-pressure system and the low-pressure system, and the fire extinguishing system can still be effectively attenuated by the fire extinguishing system can be kept at the low-pressure source and the low-pressure channel 31.
As a preferred embodiment of the invention, it may also have the following additional technical features:
the cross-sectional area of the head of the switching member 50 in the direction perpendicular to the direction of movement of the switching member 50 is larger than the cross-sectional area of the tail of the switching member 50 in the direction perpendicular to the direction of movement of the switching member 50, so that when the valve hole 11 is opened, the thrust exerted by the fluid in the high-pressure passage 40 on the head of the switching member 50 can be larger than the thrust exerted by the fluid in the low-pressure passage 30 on the tail of the switching member 50, and the fluid entering the piston chamber 14 can push the switching member 50 to close the low-pressure passage 30 can be ensured.
In this embodiment, the cross section of the switching member 50 is in a T shape, the larger part of the switching member is adapted to the piston chamber 14, the smaller part of the switching member is adapted to the communication hole 15 and movably penetrates the communication hole 15, the shape is regular, the processing and the assembly are easy, the cross section of the head part of the switching member 50 is larger than the cross section of the tail part of the switching member, and in addition, the smaller part and the larger part of the switching member 50 are respectively adapted to the communication hole 15 and the piston chamber 14, so that the leakage of the fluid in the high-pressure channel 40 and the fluid in the low-pressure channel 30 to the middle part of the switching member 50 can be reduced or prevented, and the movement of the switching member 50 is affected. In this embodiment, the second elastic device 51 adopts a spring sleeved on the switching member 50, which has a simple structure and is convenient to assemble and use, and in practical application, the second elastic device 51 can also adopt other commonly used elastic structures such as an elastic pull rope. In practical applications, the switching member 50 may be selected from other suitable shapes as needed, and is not limited thereto.
The communication hole 15 is located on one side wall of the low pressure channel 30, and the positioning groove 32 matched with the tail part of the switching piece 50 is formed on the other side wall of the low pressure channel 30, so that the switching piece 50 can be pushed by the fluid in the high pressure channel 40 to move until the tail part of the switching piece 50 is inserted into the positioning groove 32, the switching piece 50 can be fixed and positioned, deformation or fracture of the switching piece 50 caused by the impact of the fluid in the low pressure channel 30 is prevented, the service life is prolonged, and the safety and reliability are improved.
In this embodiment, the low pressure cyclone 33 is disposed in the low pressure nozzle 31, the high pressure cyclone 42 is disposed in the high pressure nozzle 41, and the low pressure cyclone 33 and the high pressure cyclone 42 can generate centrifugal action on water flow or air flow, increase tangential velocity of fluid, and improve crushing effect, thereby improving fire extinguishing performance. The low pressure cyclone 33 and the high pressure cyclone 42 generate centrifugal action on the fluid through the spiral channels, in this embodiment, the low pressure cyclone 33 and the high pressure cyclone 42 are both columnar, the peripheral walls of the two are provided with spiral grooves 60, the spiral grooves 60 and the inner walls of the corresponding low pressure nozzles 31 or high pressure nozzles 41 enclose the spiral channels together, the structure is simple, the processing and the use are convenient, and in practical application, the low pressure cyclone 33 and the high pressure cyclone 42 can also adopt other commonly used spiral structures, for example, a column containing a plurality of spiral holes can be adopted, and the invention is not limited thereto. In practical applications, the low-pressure cyclone 33 may be provided only in the low-pressure nozzle 31 or the high-pressure cyclone 42 may be provided only in the high-pressure nozzle 41, as needed.
In the present embodiment, the first pad 34 is disposed in the low pressure passage 30 at a position close to the low pressure cyclone 33, a plurality of first through holes are disposed in the first pad 34 corresponding to the spiral passages of the low pressure cyclone 33, so that the fluid can be guided and split to form a fluid beam corresponding to the spiral passages of the low pressure cyclone 33, the function of the low pressure cyclone 33 is fully exerted, the impact applied to the low pressure cyclone 33 is reduced, the second pad 43 is also disposed in the high pressure passage 40 at a position close to the high pressure cyclone 42, a plurality of second through holes 431 are disposed in the second pad 43 corresponding to the spiral passages of the high pressure cyclone 42, the fluid can be guided and split to form a fluid beam corresponding to the spiral passages of the high pressure cyclone 42, the function of the high pressure cyclone 42 is fully exerted, and the impact applied to the high pressure cyclone 42 is reduced.
The number of the low pressure nozzles 31 is several and uniformly distributed around the high pressure nozzles 41, which can improve the uniformity of spraying and can also improve the spraying amount, thereby enhancing the fire extinguishing effect.
The filter screen 21 is arranged in the main channel 20, so that the high-pressure channel 40, the low-pressure channel 30, the high-pressure nozzle 41 and the low-pressure nozzle 31 can be prevented from being blocked by mixed impurities in the fluid, the occurrence rate of faults is reduced, and the safety and the reliability are improved.
In this embodiment, the valve hole 11 is tapered, the shape of the head of the main valve core 12 is adapted to the shape of the valve hole 11, the head of the main valve core 12 can be inserted into the valve hole 11, and the outer wall of the head is tightly attached to the inner wall of the valve hole 11 so as to seal the valve hole 11, so that the sealing surface can be increased, the sealing effect is improved, and the main valve core 12 is not easy to deform and damage, and the service life is prolonged.
The valve body is provided with a guide groove 17 matched with the tail part of the main valve core 12, the tail part of the main valve core 12 is inserted in the guide groove 17 and can move along the guide groove 17 to enable the head part of the main valve core 12 to move out of the valve hole 11 to open the valve hole 11, the guide groove 17 can guide the movement of the main valve core 12, and the main valve core 12 is prevented from being offset and misplaced to influence the normal operation of the fire sprinkler, and the fire sprinkler is simple in structure and convenient to process and assemble. In this embodiment, the first elastic device 13 adopts a spring sleeved at the rear portion of the main valve core 12, so that the structure is simple and reliable, and the assembly and the use are convenient, in practical application, the first elastic device 13 may also adopt other common elastic structures such as a pull rope and a torsion spring, or the main valve core 12 may also adopt a valve plate to realize opening or closing of the valve hole 11 through swing, rotation and other movable actions, which are common technical means in the art, and can be flexibly selected by a person skilled in the art as required, and not described in detail herein.
The above additional technical features can be freely combined and superimposed by a person skilled in the art without conflict.
The foregoing is only a preferred embodiment of the present invention, and all technical solutions for achieving the object of the present invention by substantially the same means are within the scope of the present invention.
Claims (7)
1. The utility model provides a high low pressure automatic switch-over fire control shower nozzle which characterized in that: comprises a spray head main body (10), wherein the spray head main body (10) is provided with a main channel (20), a low-pressure channel (30) and a high-pressure channel (40),
the low-pressure channel (30) is communicated with the main channel (20), and a low-pressure nozzle (31) matched with the low-pressure channel (30) is arranged on the spray head main body (10);
the high-pressure channel (40) is communicated with the main channel (20) through a valve hole (11), and a high-pressure nozzle (41) matched with the high-pressure channel (40) is arranged on the nozzle main body (10);
a main valve core (12) is movably arranged on the nozzle main body (10) and is maintained at a position for closing the valve hole (11) by a first elastic device (13), and when the pressure of fluid in the main channel (20) is larger than a preset value, the main valve core (12) can be pushed to move to open the valve hole (11);
the spray head main body (10) is internally provided with a piston cavity (14) communicated with the high-pressure channel (40), and the piston cavity (14) is communicated with the low-pressure channel (30) through a communication hole (15); the head of a switching member (50) is matched with the piston cavity (14) and is arranged in the piston cavity (14) in a sliding manner, the switching member (50) can be pushed by fluid entering the piston cavity (14) from a high-pressure channel (40) to enable the tail of the switching member (50) to be inserted into the low-pressure channel (30) through the communication hole (15) so as to block the low-pressure channel (30), a second elastic device (51) for pushing the switching member (50) to move towards the direction of opening the low-pressure channel (30) is arranged on the nozzle main body (10), the cross-section area of the head of the switching member (50) in the direction perpendicular to the moving direction of the switching member (50) is larger than the cross-section area of the tail of the switching member (50) in the direction perpendicular to the moving direction of the switching member (50), the cross-section area of the switching member (50) is in a T shape, the larger part of the switching member (50) is matched with the piston cavity (30) through the communication hole (15) to block the low-pressure channel (30), the smaller part of the switching member (50) is matched with the communication hole (15) and is arranged on the other side wall (30) of the side wall (30) which is matched with the side wall (32) on the side wall (30) which is arranged on the side of the low-pressure channel (30), the switching piece (50) can be moved under the pushing of the fluid in the high-pressure channel (40) to enable the tail part of the switching piece (50) to be inserted into the positioning groove (32).
2. The high-low pressure automatic switching fire sprinkler according to claim 1, wherein: the low-pressure nozzle (31) is internally provided with a low-pressure cyclone (33).
3. The high-low pressure automatic switching fire sprinkler according to claim 1, wherein: the high-pressure nozzle (41) is internally provided with a high-pressure cyclone (42).
4. The high-low pressure automatic switching fire sprinkler according to claim 1, wherein: the number of the low-pressure nozzles (31) is a plurality and the low-pressure nozzles (41) are uniformly distributed around the high-pressure nozzles.
5. The high-low pressure automatic switching fire sprinkler according to claim 1, wherein: a filter screen (21) is arranged in the main channel (20).
6. The high-low pressure automatic switching fire sprinkler according to claim 1, wherein: the valve hole (11) is conical, the shape of the head of the main valve core (12) is matched with that of the valve hole (11), the head of the main valve core (12) can be inserted into the valve hole (11) and the outer wall of the head of the main valve core is clung to the inner wall of the valve hole (11) so as to seal the valve hole (11).
7. The high-low pressure automatic switching fire sprinkler according to claim 6, wherein: the upper part of the valve hole (11) is provided with a guide groove (17) which is matched with the tail part of the main valve core (12), and the tail part of the main valve core (12) is inserted into the guide groove (17) and can move along the guide groove (17) to enable the head part of the main valve core (12) to move out of the valve hole (11) so as to open the valve hole (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910902089.3A CN110604895B (en) | 2019-09-24 | 2019-09-24 | High-low pressure automatic switching fire control shower nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910902089.3A CN110604895B (en) | 2019-09-24 | 2019-09-24 | High-low pressure automatic switching fire control shower nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110604895A CN110604895A (en) | 2019-12-24 |
| CN110604895B true CN110604895B (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910902089.3A Active CN110604895B (en) | 2019-09-24 | 2019-09-24 | High-low pressure automatic switching fire control shower nozzle |
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| CN (1) | CN110604895B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114146342A (en) * | 2021-11-15 | 2022-03-08 | 应急管理部天津消防研究所 | Compound atomizing type gas fire extinguishing spray head |
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| EP1250959A1 (en) * | 2001-04-19 | 2002-10-23 | California Kleidienst France | Nozzle and wash system with such a nozzle |
| CN2755379Y (en) * | 2004-11-19 | 2006-02-01 | 尹人奇 | High and low pressure switch rotary valve |
| CN201161216Y (en) * | 2008-02-20 | 2008-12-10 | 苏州黑猫(集团)有限公司 | Fast switch over combined nozzle |
| WO2011140493A1 (en) * | 2010-05-07 | 2011-11-10 | Mark Vii Equipment Inc. | Dual pressure spray arm assembly with diverter valve |
| CN102927316A (en) * | 2011-08-11 | 2013-02-13 | 上海梅山钢铁股份有限公司 | Self-operated pressure range switching device |
| WO2015089134A1 (en) * | 2013-12-13 | 2015-06-18 | Graco Minnesota Inc. | High-pressure to low-pressure changeover valve for a positive displacement pump |
| CN211383587U (en) * | 2019-09-24 | 2020-09-01 | 九江中船消防设备有限公司 | High-low pressure automatic switch-over fire control shower nozzle |
-
2019
- 2019-09-24 CN CN201910902089.3A patent/CN110604895B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1250959A1 (en) * | 2001-04-19 | 2002-10-23 | California Kleidienst France | Nozzle and wash system with such a nozzle |
| CN2755379Y (en) * | 2004-11-19 | 2006-02-01 | 尹人奇 | High and low pressure switch rotary valve |
| CN201161216Y (en) * | 2008-02-20 | 2008-12-10 | 苏州黑猫(集团)有限公司 | Fast switch over combined nozzle |
| WO2011140493A1 (en) * | 2010-05-07 | 2011-11-10 | Mark Vii Equipment Inc. | Dual pressure spray arm assembly with diverter valve |
| CN102927316A (en) * | 2011-08-11 | 2013-02-13 | 上海梅山钢铁股份有限公司 | Self-operated pressure range switching device |
| WO2015089134A1 (en) * | 2013-12-13 | 2015-06-18 | Graco Minnesota Inc. | High-pressure to low-pressure changeover valve for a positive displacement pump |
| CN211383587U (en) * | 2019-09-24 | 2020-09-01 | 九江中船消防设备有限公司 | High-low pressure automatic switch-over fire control shower nozzle |
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| CN110604895A (en) | 2019-12-24 |
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