Hydraulic control fire monitor head

Abstract

The application provides a liquid control fire-fighting monitor head, and relates to the technical field of fire-fighting equipment. The liquid control fire-fighting monitor head comprises a core cover, a core shaft, a spray core, a core sleeve, a spring, a flow stabilizer, an outer nozzle, an inner nozzle, a second push rod cylinder, a first push rod cylinder, a hydraulic outer cylinder, a hydraulic inner cylinder, a shell, a nozzle joint, a valve body support, a controller, a second three-position four-way reversing valve and a first three-position four-way reversing valve. High-pressure water flow is used as a power source. The relative position of the inner nozzle and the outer nozzle and the outlet pressure intensity are controlled through the second three-position four-way reversing valve, the first three-position four-way reversing valve, the second push rod cylinder, the first push rod cylinder, the hydraulic outer cylinder and the hydraulic inner cylinder. The conversion of the two jet flow forms and the jet flow intensity is realized. In complex fire rescue work, the application has a wide application range, a high safety factor and a low operation difficulty.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting equipment technology, and in particular to a hydraulically controlled fire monitor head. Background Technology

[0002] In recent years, with the continuous progress and development of society and the economy, buildings such as warehouses, shopping malls, exhibition centers, and theaters are becoming increasingly tall and dense. Once a fire breaks out, rescue efforts become extremely difficult, and the fires are highly likely to escalate into major or even catastrophic incidents, causing enormous property damage and casualties. Fire monitors, as crucial equipment for long-distance fire suppression, play a vital role in eliminating fire hazards. However, conventional fire monitors have a simple structure, cannot adapt their spray patterns to different fire conditions, and cannot adjust the spray distance or intensity according to the fire situation.

[0003] Patent CN111388924A discloses a fire monitor head that controls the spray flow and spray status through a structure of a first motor at the core and a second motor on the head. The disadvantages of this technical solution are: complex structure, risk of leakage from the motor at the core, excessively high requirements for the operating environment of the head's circuitry, and difficulty in effectively ensuring power supply during long-distance firefighting. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulically controlled fire monitor head that can switch between two jet modes, namely spray and mist, and jet intensity. It has a wide range of applications, a high safety factor, and low operation difficulty.

[0005] A hydraulically controlled fire monitor head includes: a core cover, a core shaft, a nozzle core, a core sleeve, a spring, a flow stabilizer, an outer nozzle, an inner nozzle, a second push rod cylinder, a first push rod cylinder, a hydraulic outer cylinder, a hydraulic inner cylinder, a housing, a nozzle connector, a valve body bracket, a controller, a second three-position four-way directional valve, and a first three-position four-way directional valve.

[0006] The core cover is sleeved on the first end of the core shaft and is threaded; the first outer end of the core cover is connected to the first inner end of the spray core.

[0007] The core sleeve is fitted onto the core shaft; the second inner end of the spray core is fitted onto the core sleeve and slidably connected to the second spring, which is disposed inside the spray core and fitted onto the second outer end of the core cover, the core shaft, and the core sleeve;

[0008] The second end of the mandrel passes through the flow stabilizer and is threadedly connected to the flow stabilizer; the housing is fixedly mounted on the first end of the flow stabilizer, the inner nozzle is fixedly mounted on the housing, and the outer nozzle is sleeved on the inner nozzle; the nozzle connector is fixedly mounted on the second end of the flow stabilizer; the spray core, the inner nozzle, and the outer nozzle form a tapered flare.

[0009] The flow stabilizer is provided with a shoulder, and the valve body bracket is provided on the first end face of the shoulder; the valve body bracket is provided with a first groove and a second groove, the first three-position four-way reversing valve is provided in the first groove, and the second three-position four-way reversing valve is provided in the second groove; the controller is fixed on the valve body bracket.

[0010] The outer nozzle is fixedly connected to the first end of the second push rod cylinder, and the inner nozzle is fixedly connected to the first end of the first push rod cylinder;

[0011] The first end of the hydraulic outer cylinder is connected to the second end of the second push rod cylinder; the third end of the second push rod cylinder is connected to the second end of the hydraulic outer cylinder.

[0012] The second end of the first push rod cylinder is connected to the third end of the hydraulic outer cylinder, the first end of the hydraulic inner cylinder is fixedly connected to the housing, and the second end of the hydraulic inner cylinder is fixedly connected to the fourth end of the hydraulic outer cylinder.

[0013] The hydraulic inner cylinder is fixed to the second end face of the shaft shoulder;

[0014] A first chamber is formed between the first push rod cylinder, the hydraulic outer cylinder, and the hydraulic inner cylinder; a second chamber is formed between the first push rod cylinder, the second push rod cylinder, and the hydraulic outer cylinder; and a third chamber is formed between the second push rod cylinder and the hydraulic outer cylinder.

[0015] The P port of the first three-position four-way reversing valve is connected to the nozzle connector, the T port of the first three-position four-way reversing valve is connected to the external nozzle, the A port of the first three-position four-way reversing valve is connected to the first chamber, and the B port of the first three-position four-way reversing valve is connected to the third chamber.

[0016] The P port of the second three-position four-way reversing valve is connected to the nozzle connector, the T port of the second three-position four-way reversing valve is connected to the external nozzle, the A port of the second three-position four-way reversing valve is connected to the second chamber, and the B port of the second three-position four-way reversing valve is connected to the third chamber.

[0017] Both the second three-position four-way directional valve and the first three-position four-way directional valve are connected to the controller.

[0018] Optionally, the first outer end of the core cover and the first inner end of the spray core are connected by a U-shaped sealing ring.

[0019] Optionally, the outer nozzle and the inner nozzle are fixed and motion-constrained by a first limiting bolt and a fourth limiting bolt.

[0020] Optionally, the inner nozzle and the housing are fixed and motion-constrained by a second limiting bolt and a third limiting bolt.

[0021] Optionally, the controller is fixed to the valve body bracket by a first fixing bolt.

[0022] Optionally, the valve body bracket is fixed to the first end face of the shoulder by a second fixing bolt.

[0023] Optionally, the second end of the hydraulic inner cylinder and the fourth end of the hydraulic outer cylinder are fixed to the shoulder by a third fixing bolt.

[0024] Optionally, the first push rod cylinder and the hydraulic inner cylinder are sealed by a D-type sealing ring.

[0025] Optionally, the fourth end of the hydraulic outer cylinder and the second end of the hydraulic inner cylinder are sealed by a first type A sealing ring, the second end of the first push rod cylinder and the third end of the hydraulic outer cylinder are sealed by a second type A sealing ring, and the third end of the second push rod cylinder and the second end of the hydraulic outer cylinder are sealed by a third type A sealing ring.

[0026] Optionally, the first push rod cylinder and the second push rod cylinder are sealed by a type B sealing ring; the first end of the hydraulic outer cylinder and the second end of the second push rod cylinder are sealed by a type C sealing ring.

[0027] The effects of this invention are as follows:

[0028] This invention relates to a hydraulically controlled fire monitor head, employing a combined inner and outer nozzle. It can rapidly change the jet pattern according to fire conditions. When long-distance fire suppression is required, the first three-position four-way reversing valve closes, while the second three-position four-way reversing valve opens, connecting the high-pressure water flow to the second chamber. The third chamber connects to the drain hole on the outer nozzle. The second push rod cylinder pushes the outer nozzle to extend axially, causing a change in the relative positions of the conical flare of the inner and outer nozzles. After passing through the conical flare of the inner nozzle, the water impacts the cylindrical wall of the outer nozzle, rebounds, converges, and is then ejected, changing the jet pattern from a mist to a spray.

[0029] This invention relates to a hydraulically controlled fire monitor head, employing a movable nozzle core that can move axially along the core sleeve. Simultaneously, a spring is installed within the nozzle core to control the water flow intensity and flow rate. When the fire point is far away, in spray mode, a first three-position four-way reversing valve is connected, and a second three-position four-way reversing valve is closed. High-pressure water flows into the first chamber, the second chamber is closed, and the third chamber is connected to the drain hole on the outer nozzle. The first and second push rod cylinders simultaneously push the inner and outer nozzles axially outward. The inner nozzle presses against the nozzle core, compressing its internal spring and increasing the outlet leakage pressure, thereby controlling the water flow intensity.

[0030] This invention relates to a hydraulically controlled fire monitor head, which is fully mechanized, reducing the need for electrical power supply equipment and lines compared to motor-driven systems. In complex fire rescue operations, this reduces the uncertainties caused by safety hazards such as motor damage, control line damage, power supply equipment failure, and electrical leakage. Attached Figure Description

[0031] Figure 1 This is a structural diagram of the hydraulically controlled fire monitor head of the present invention;

[0032] Figure 2 This is a hydraulic schematic diagram of the hydraulically controlled fire monitor head of the present invention.

[0033] In the diagram: 1. Core cover; 2. Spray core; 3. Outer nozzle; 4. Inner nozzle; 501. First limit bolt; 502. Second limit bolt; 6. Second push rod cylinder; 7. First push rod cylinder; 8. Core sleeve; 9. Hydraulic outer cylinder; 10. Hydraulic inner cylinder; 1101. First three-position four-way directional valve; 1201. First fixing bolt; 13. Valve body bracket; 14. Controller; 15. Nozzle connector; 1102. Second three-position four-way directional valve; 16. Flow stabilizer; 1202. Second fixing bolt; 1203. Third fixing bolt; 1701. First type A sealing ring; 1702. Second type A sealing ring; 1703. Third type A sealing ring; 18. Type B sealing ring; 19. Housing; 20. Type C sealing ring; 21. Type D sealing ring; 22. Spring; 23. Type F sealing ring; 24. Mandrel; 25. U-shaped sealing ring. Detailed Implementation

[0034] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0035] Figure 1 This is a structural diagram of the hydraulically controlled fire monitor head of the present invention. Figure 1 As shown, the present invention provides a hydraulically controlled fire monitor head, which includes: a core cover 1, a core shaft 24, a nozzle core 2, a core sleeve 8, a spring 22, a flow stabilizer 16, an outer nozzle 3, an inner nozzle 4, a second push rod cylinder 6, a first push rod cylinder 7, a hydraulic outer cylinder 9, a hydraulic inner cylinder 10, a housing 19, a nozzle connector 15, a valve body bracket 13, a controller 14, a second three-position four-way reversing valve 1102, and a first three-position four-way reversing valve 1101.

[0036] The core cover 1 is fitted onto the first end of the spindle 24 and is threaded together; the first outer end of the core cover 1 is connected to the first inner end of the spray core 2. The first outer end of the core cover 1 and the first inner end of the spray core 2 are connected by a U-shaped sealing ring 25.

[0037] The core sleeve 8 is fitted onto the core shaft 24; the second inner end of the spray core 2 is fitted onto the core sleeve 8 and is slidably connected; the spring 22 is located inside the spray core 2 and is fitted onto the second outer end of the core cover 1, the core shaft 24, and the core sleeve 8.

[0038] The second end of the spindle 24 passes through the flow stabilizer 16 and is threadedly connected to it. The housing 19 is fixedly mounted on the first end of the flow stabilizer 16, the inner nozzle 4 is fixedly mounted on the housing 19, and the outer nozzle 3 is sleeved on the inner nozzle 4. The nozzle connector 15 is fixedly mounted on the second end of the flow stabilizer 16. The nozzle core 2, the inner nozzle 4, and the outer nozzle 3 form a tapered flare. The outer nozzle 3 and the inner nozzle 4 are fixed and restrained in motion by the first limiting bolt 501 and the fourth limiting bolt. The inner nozzle 4 and the housing 19 are fixed and restrained in motion by the second limiting bolt 502 and the third limiting bolt.

[0039] The flow stabilizer 16 has a shoulder, and the valve body bracket 13 is mounted on the first end face of the shoulder. The valve body bracket 13 has a first groove and a second groove. A first three-position four-way directional valve 1101 is mounted in the first groove, and a second three-position four-way directional valve 1102 is mounted in the second groove. The controller 14 is fixed to the valve body bracket 13. The controller 14 is fixed to the valve body bracket 13 by a first fixing bolt 1201. The valve body bracket 13 is fixed to the first end face of the shoulder by a second fixing bolt 1202.

[0040] The outer nozzle 3 is fixedly connected to the first end of the second push rod cylinder 6, and the inner nozzle 4 is fixedly connected to the first end of the first push rod cylinder 7.

[0041] The first end of the hydraulic outer cylinder 9 is connected to the second end of the second push rod cylinder 6; the third end of the second push rod cylinder 6 is connected to the second end of the hydraulic outer cylinder 9.

[0042] The second end of the first push rod cylinder 7 is connected to the third end of the hydraulic outer cylinder 9, the first end of the hydraulic inner cylinder 10 is fixedly connected to the housing 19, and the second end of the hydraulic inner cylinder 10 is fixedly connected to the fourth end of the hydraulic outer cylinder 9. The second end of the hydraulic inner cylinder 10 and the fourth end of the hydraulic outer cylinder 9 are fixed to the shoulder by the third fixing bolt 1203.

[0043] The hydraulic inner cylinder 10 is fixed on the second end face of the shaft shoulder.

[0044] A first chamber is formed between the first push rod cylinder 7, the hydraulic outer cylinder 9, and the hydraulic inner cylinder 10; a second chamber is formed between the first push rod cylinder 7, the second push rod cylinder 6, and the hydraulic outer cylinder 9; and a third chamber is formed between the second push rod cylinder 6 and the hydraulic outer cylinder 9.

[0045] The P port of the first three-position four-way directional valve 1101 is connected to the nozzle connector 15, the T port of the first three-position four-way directional valve 1101 is connected to the external nozzle 3, the A port of the first three-position four-way directional valve 1101 is connected to the first chamber, and the B port of the first three-position four-way directional valve 1101 is connected to the third chamber.

[0046] The P port of the second three-position four-way directional valve 1102 is connected to the nozzle connector 15, the T port of the second three-position four-way directional valve 1102 is connected to the external nozzle 3, the A port of the second three-position four-way directional valve 1102 is connected to the second chamber, and the B port of the second three-position four-way directional valve 1102 is connected to the third chamber.

[0047] Both the second three-position four-way directional valve 1102 and the first three-position four-way directional valve 1101 are connected to the controller 14.

[0048] The first push rod cylinder 7 and the hydraulic inner cylinder 10 are sealed by a D-type sealing ring 21. The fourth end of the hydraulic outer cylinder 9 and the second end of the hydraulic inner cylinder 10 are sealed by a first A-type sealing ring 1701; the second end of the first push rod cylinder 7 and the third end of the hydraulic outer cylinder 9 are sealed by a second A-type sealing ring 1702; and the third end of the second push rod cylinder 6 and the second end of the hydraulic outer cylinder 9 are sealed by a third A-type sealing ring 1703. The first push rod cylinder 7 and the second push rod cylinder 6 are sealed by a B-type sealing ring 18; and the first end of the hydraulic outer cylinder 9 and the second end of the second push rod cylinder 6 are sealed by a C-type sealing ring 20. The outer nozzle 3 and the inner nozzle 4 are sealed by an F-type sealing ring 23.

[0049] like Figure 2 As shown, the high-pressure water flow inside the gun head is led out from the nozzle connector 15, and after passing through the first three-position four-way reversing valve 1101 and the second three-position four-way reversing valve 1102, it flows into the first chamber, the second chamber and the third chamber composed of the first push rod cylinder 7, the second push rod cylinder 6, the hydraulic inner cylinder 10 and the hydraulic outer cylinder 9 to control the extension and retraction of the first push rod cylinder 7 and the second push rod cylinder 6.

[0050] The specific working process of adjusting the jet pattern and jet intensity of the hydraulically controlled fire monitor head of this invention is as follows:

[0051] Water flows into the main channel of the nozzle head through nozzle connector 15. Under the action of high-pressure water flow, the nozzle core 2 compresses the spring 22, causing it to move axially along the core sleeve 8 and core cover 1. The channel between the nozzle core 2 and the inner nozzle 4 opens, and high-pressure water is ejected. On the other hand, the high-pressure water flows through the through hole on nozzle connector 15 into the first three-position four-way reversing valve 1101 and the second three-position four-way reversing valve 1102, and then into the first chamber, the second chamber, and the third chamber. This controls the insertion and extension of the first push rod cylinder 7 and the second push rod cylinder 6, and simultaneously works with the inner nozzle 4 and the outer nozzle 3 to control the jet pattern and jet intensity of the water flow.

[0052] When a low-intensity spray is required, controller 14 maintains both the first three-position four-way directional valve 1101 and the second three-position four-way directional valve 1102 in the neutral position. The initial positions of the inner nozzle 4 and the outer nozzle 3 are as follows: Figure 1 As shown, this is the low-intensity spray mode. The water flows through the gap between the inner nozzle 4 and the spray core 2, and is sprayed out in a spray pattern after passing through the conical expansion of the inner nozzle 4 and the outer nozzle 3.

[0053] When the jet needs to be converted to a high-intensity spray, controller 14 controls the position of the first three-position four-way directional valve 1101 to be adjusted from the middle position to the right position, and controller 14 controls the position of the second three-position four-way directional valve 1102 to remain in the middle position. The high-pressure water in the nozzle connector 15 flows into the first chamber through the first three-position four-way directional valve 1101, the second chamber remains closed, and the water in the third chamber flows out through the first three-position four-way directional valve 1101 and is ejected from the drain hole on the outer nozzle 3 along with the sprayed water. Due to the pressure difference, the first push rod cylinder 7 and the second push rod cylinder 6 extend outward simultaneously, pushing the inner nozzle 4 and the outer nozzle 3 to move outward, compressing the spring 22. While maintaining the relative position unchanged, the spray pattern does not change, thus increasing the required spray pressure and jet intensity.

[0054] When the jet needs to be converted to low-intensity spray, controller 14 controls the first three-position four-way directional valve 1101 to remain in the neutral position, and controller 14 controls the second three-position four-way directional valve 1102 to adjust its position from the neutral position to the right position. The high-pressure water in the nozzle connector 15 flows into the second chamber through the second three-position four-way directional valve 1102, the first chamber remains closed, and the water in the third chamber is ejected from the drain hole on the outer nozzle 3 along with the sprayed water through the second three-position four-way directional valve 1102. The first push rod cylinder 7 remains stationary because the first chamber is closed, while the second push rod cylinder 6 extends outward due to the internal pressure difference between the second and third chambers, pushing the outer nozzle 3 outward. The relative positions of the inner nozzle 4 and the outer nozzle 3 change, and the jet pattern changes from low-intensity spray to low-intensity spray.

[0055] When the jet needs to be converted to high-intensity spray, firstly, controller 14 controls the position of the first three-position four-way directional valve 1101 to be adjusted from the middle position to the right position, and controller 14 controls the position of the second three-position four-way directional valve 1102 to remain in the middle position. The high-pressure water in the nozzle connector 15 flows into the first chamber through the first three-position four-way directional valve 1101, the second chamber remains closed, and the water in the third chamber flows out through the first three-position four-way directional valve 1101 and is ejected from the drain hole on the outer nozzle 3 along with the sprayed water. Due to the pressure difference, the first push rod cylinder 7 and the second push rod cylinder 6 extend outward simultaneously, pushing the inner nozzle 4 and the outer nozzle 3 to move outward. After reaching the designated position, the position of the first three-position four-way directional valve 1101 is adjusted to the middle position, and controller 14 controls the position of the second three-position four-way directional valve 1102 to be adjusted from the middle position to the right position. High-pressure water in nozzle connector 15 flows into the second chamber through the second three-position four-way directional valve 1102, while the first chamber remains closed. Water in the third chamber flows out through the drain hole on the outer nozzle 3 along with the jet water flow via the second three-position four-way directional valve 1102. The first push rod cylinder 7 remains stationary due to the closed first chamber, while the second push rod cylinder 6 extends outward due to the internal pressure difference between the second and third chambers, pushing the outer nozzle 3 outward. The relative positions of the inner nozzle 4 and the outer nozzle 3 change, and the jet pattern changes from high-intensity spray to high-intensity jet.

[0056] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A hydraulically controlled fire monitor head, characterized in that, It includes: Core cover, core shaft, spray core, core sleeve, spring, flow stabilizer, outer nozzle, inner nozzle, second push rod cylinder, first push rod cylinder, hydraulic outer cylinder, hydraulic inner cylinder, housing, nozzle connector, valve body bracket, controller, second three-position four-way directional valve and first three-position four-way directional valve; The core cover is sleeved on the first end of the core shaft and is threaded; the first outer end of the core cover is connected to the first inner end of the spray core. The core sleeve is fitted onto the core shaft; the second inner end of the spray core is fitted onto the core sleeve and slidably connected; the spring is disposed inside the spray core and fitted onto the second outer end of the core cover, the core shaft, and the core sleeve; The second end of the mandrel passes through the flow stabilizer and is threadedly connected to the flow stabilizer; the housing is fixedly mounted on the first end of the flow stabilizer, the inner nozzle is fixedly mounted on the housing, and the outer nozzle is sleeved on the inner nozzle; the nozzle connector is fixedly mounted on the second end of the flow stabilizer; the spray core, the inner nozzle, and the outer nozzle form a tapered flare. The flow stabilizer is provided with a shoulder, and the valve body bracket is provided on the first end face of the shoulder; the valve body bracket is provided with a first groove and a second groove, the first three-position four-way reversing valve is provided in the first groove, and the second three-position four-way reversing valve is provided in the second groove; the controller is fixed on the valve body bracket. The outer nozzle is fixedly connected to the first end of the second push rod cylinder, and the inner nozzle is fixedly connected to the first end of the first push rod cylinder. The first end of the hydraulic outer cylinder is connected to the second end of the second push rod cylinder; the third end of the second push rod cylinder is connected to the second end of the hydraulic outer cylinder. The second end of the first push rod cylinder is connected to the third end of the hydraulic outer cylinder, the first end of the hydraulic inner cylinder is fixedly connected to the housing, and the second end of the hydraulic inner cylinder is fixedly connected to the fourth end of the hydraulic outer cylinder. The hydraulic inner cylinder is fixed to the second end face of the shaft shoulder; A first chamber is formed between the first push rod cylinder, the hydraulic outer cylinder, and the hydraulic inner cylinder; a second chamber is formed between the first push rod cylinder, the second push rod cylinder, and the hydraulic outer cylinder; and a third chamber is formed between the second push rod cylinder and the hydraulic outer cylinder. The P port of the first three-position four-way reversing valve is connected to the nozzle connector, the T port of the first three-position four-way reversing valve is connected to the external nozzle, the A port of the first three-position four-way reversing valve is connected to the first chamber, and the B port of the first three-position four-way reversing valve is connected to the third chamber. The P port of the second three-position four-way reversing valve is connected to the nozzle connector, the T port of the second three-position four-way reversing valve is connected to the external nozzle, the A port of the second three-position four-way reversing valve is connected to the second chamber, and the B port of the second three-position four-way reversing valve is connected to the third chamber. Both the second three-position four-way directional valve and the first three-position four-way directional valve are connected to the controller.

2. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The first outer end of the core cover and the first inner end of the spray core are connected by a U-shaped sealing ring.

3. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The outer nozzle and the inner nozzle are fixed and restrained by the first limiting bolt and the fourth limiting bolt.

4. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The inner nozzle and the housing are fixed and restrained by the second and third limiting bolts.

5. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The controller is fixed to the valve body bracket by the first fixing bolt.

6. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The valve body bracket is fixed to the first end face of the shoulder by a second fixing bolt.

7. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The second end of the hydraulic inner cylinder and the fourth end of the hydraulic outer cylinder are fixed to the shoulder by a third fixing bolt.

8. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The first push rod cylinder and the hydraulic inner cylinder are sealed by a D-type sealing ring.

9. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The fourth end of the hydraulic outer cylinder and the second end of the hydraulic inner cylinder are sealed by a first type A seal ring, the second end of the first push rod cylinder and the third end of the hydraulic outer cylinder are sealed by a second type A seal ring, and the third end of the second push rod cylinder and the second end of the hydraulic outer cylinder are sealed by a third type A seal ring.

10. The hydraulically controlled fire monitor head according to claim 1, characterized in that, The first push rod cylinder and the second push rod cylinder are sealed by a type B sealing ring; the first end of the hydraulic outer cylinder and the second end of the second push rod cylinder are sealed by a type C sealing ring.

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