A variable flow injection device

Abstract

The invention discloses a variable flow rate spraying device, comprising a nozzle and a flow guide tube, wherein the flow guide tube comprises an inner flow guide tube and an outer flow guide tube, the inner flow guide tube is arranged in the outer flow guide tube, a plurality of semicircular spray ports are arranged in the circumferential direction of the front end of the nozzle, the spray ports obliquely penetrate the nozzle and form an oblique groove in the nozzle, a flow regulating device comprises a push rod bin, a push rod and a piston, the push rod bin is fixed at the right end of the interior of the flow guide tube, one end of the push rod is connected to the push rod bin, and the other end is connected to the piston, the piston comprises a front section piston and a rear section piston which are fixedly connected, the outer cylindrical surface of the front section piston is combined with the oblique groove to form a water flow channel, the rear section piston is fitted with the inner wall of the flow guide tube, and a piston oblique surface is formed at the connection between the front section piston and the rear section piston; the invention can flexibly adjust the cross-sectional area of ​​the water flow channel by using a special nozzle and a piston in combination, thereby adjusting the spray flow rate and spray distance of water.

Description

Technical Field

[0001] The invention relates to a variable flow rate spraying device, belonging to the technical field of fire-fighting nozzles. Background Art

[0002] In the process of extinguishing a fire, firefighters usually use high-flow fire monitors to spray the fire. The front end of the high-flow fire monitor is usually equipped with a spray device, which can adjust the water flow and spray range to meet the needs of different fire conditions. However, the fluid channel inside the traditional spray device is highly curved, with multiple large-angle bends, resulting in high pressure loss, which reduces the range of the fire monitor and reduces its operating capacity. Summary of the Invention

[0003] To address the deficiencies of the prior art, the present invention provides a variable flow spray device, comprising a specially designed nozzle and a piston, which can flexibly adjust the water flow rate and thus the spray distance according to the needs of the firefighting operation site. The channel curvature inside the spray device is relatively small, which greatly reduces the pressure loss and solves the problems in the above-mentioned background technology.

[0004] The technical solution adopted in the present invention is:

[0005] A variable flow injection device comprises a nozzle and a guide tube, wherein the guide tube comprises a hollow guide inner tube and a guide outer tube, wherein the guide inner tube is placed in the guide outer tube, and the guide inner tube and the guide outer tube are on the same central axis, and a plurality of partitions connected to the inner wall of the guide outer tube are arranged circumferentially along the outer surface of the guide inner tube, and the plurality of partitions evenly divide the space between the guide inner tube and the guide outer tube into a plurality of flow channels; the nozzle is a cylindrical structure, the outer surface of the nozzle is sealed with the inner wall of the guide outer tube, and a plurality of semicircular injection ports are circumferentially arranged at the front end of the nozzle, wherein the injection ports obliquely penetrate the interior of the nozzle and form an oblique groove inside the nozzle, and the plurality of circumferentially arranged injection ports surround the nozzle. The middle area is a hollow structure; a flow regulating device is provided inside the inner guide tube, and the flow regulating device includes a push rod bin, a push rod and a piston, the push rod bin is fixed to the right end of the inner guide tube, one end of the push rod is movably slidably connected to the push rod bin, and the piston includes a front section piston and a rear section piston that are fixedly connected, the front section piston and the rear section piston are both cylindrical structures, the outer surface of the front section piston fits in the gap between the injection port, the outer cylindrical surface of the front section piston and the inclined groove are combined to form a water flow channel, the rear section piston fits in the inner wall of the inner guide tube, and a piston inclined surface is formed at the connection between the front section piston and the rear section piston, and the rear section piston is fixedly connected to the other end of the push rod;

[0006] An annular groove 1 is provided on the outer surface of the nozzle connected to the outer guide tube, an outer sealing ring is provided in the annular groove 1, and the outer sealing ring is tightly fitted with the inner wall of the outer guide tube;

[0007] A second annular groove is provided on the outer surface of the rear piston connected to the inner wall of the guide inner tube. An inner sealing ring is provided in the second annular groove. The inner sealing ring is tightly fitted with the inner wall of the guide inner tube.

[0008] As a further preferred embodiment of the present invention, a plurality of screw holes are circumferentially arranged at the connection between the nozzle and the outer guide tube, and the screws are threadedly connected to the screw holes; by adding multiple screws, the connection between the nozzle and the outer guide tube can be strengthened, preventing the nozzle from falling off due to excessive water pressure.

[0009] As a further preferred embodiment of the present invention, the angle between the piston slope and the central axis of the flow regulating device is less than or equal to 10 degrees; the smaller the curvature of the channel, the smaller the pressure loss, which increases the range of the fire monitor and improves the operating capacity.

[0010] The beneficial effects of the present invention are as follows: a plurality of semicircular injection ports are arranged circumferentially at the front end of the nozzle, the injection ports penetrate the interior of the nozzle obliquely upward and form an oblique groove inside the nozzle, and the nozzle is equipped with a piston to flexibly adjust the cross-sectional area of ​​the water flow channel formed by the outer cylindrical surface of the front piston and the oblique groove, thereby controlling the water flow rate, and adjusting the injection distance by controlling the size of the water flow rate. The fluid channel inside the injection device has a smaller degree of curvature, so that the pressure loss is smaller and the range is increased. The space between the inner guide tube and the outer guide tube is divided into multiple flow channels by a partition, which can effectively eliminate turbulence, improve the injection concentration and increase the range. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the piston propulsion of the present invention;

[0012] Figure 2 This is a schematic diagram of the structure of the piston contraction of the present invention;

[0013] Figure 3 It is a right side view of the present invention;

[0014] Figure 4 It is a left side view of the present invention.

[0015] The main reference numerals in the figures have the following meanings:

[0016] 1. Nozzle, 2. Inner guide tube, 3. Outer guide tube, 4. Partition, 5. Injection port, 6. Inclined groove, 7. Push rod compartment, 8. Push rod, 10. Front piston, 11. Rear piston, 12. Piston slope, 13. Screw, 14. Annular groove 1, 15. Outer sealing ring, 16. Annular groove 2, 17. Inner sealing ring. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1-4 As shown: This embodiment is a variable flow injection device, including a nozzle 1 and a guide tube, the guide tube includes a hollow structure of the guide inner tube 2 and the guide outer tube 3, the guide inner tube 2 is placed in the guide outer tube 3, and the guide inner tube 2 and the guide outer tube 3 are on the same central axis, and a plurality of partitions 4 connected to the inner wall of the guide outer tube 3 are arranged along the circumference of the outer surface of the guide inner tube 2, and the plurality of partitions 4 evenly divide the space between the guide inner tube 2 and the guide outer tube 3 into a plurality of flow channels; the nozzle 1 is a cylindrical structure, the outer surface of the nozzle 1 is sealed with the inner wall of the guide outer tube 3, and a plurality of semicircular injection ports 5 are circumferentially arranged at the front end of the nozzle 1, the injection ports 5 obliquely penetrate the interior of the nozzle 1 and form an inclined groove 6 inside the nozzle 1, and the plurality of circumferentially arranged injection ports 5 The enclosed middle area is a hollow structure; a flow regulating device is provided inside the guide inner tube 2, the flow regulating device includes a push rod bin 7, a push rod 8 and a piston, the push rod bin 7 is fixed to the right end of the inner guide inner tube 2, one end of the push rod 8 is movably slidably connected to the push rod bin 7, and the piston includes a front section piston 10 and a rear section piston 11 that are fixedly connected, the front section piston 10 and the rear section piston 11 are both cylindrical structures, the outer surface of the front section piston 10 is fitted with a gap between the injection port 5, the outer cylindrical surface of the front section piston 10 and the inclined groove 6 are combined to form a water flow channel, the rear section piston 11 is fitted with the inner wall of the guide inner tube 2, a piston inclined surface 12 is formed at the connection between the front section piston 10 and the rear section piston 11, and the rear section piston 11 is fixedly connected to the other end of the push rod 8;

[0019] An annular groove 14 is provided on the outer surface where the nozzle 1 is connected to the outer guide tube 3. An outer sealing ring 15 is provided in the annular groove 14. The outer sealing ring 15 is tightly fitted with the inner wall of the outer guide tube 3. The outer sealing ring 15 can prevent water from leaking out of the connection between the nozzle 1 and the outer guide tube 3.

[0020] An annular groove 2 16 is provided on the outer surface where the rear piston 11 is connected to the inner wall of the guide inner tube 2, and an inner sealing ring 17 is provided in the annular groove 2 16 . The inner sealing ring 17 fits tightly with the inner wall of the guide inner tube 2; the inner sealing ring 17 can prevent water from entering the push rod compartment 7, causing damage to the inside of the push rod compartment 7 and making it impossible to push or retract the push rod 8.

[0021] In this embodiment, a plurality of screw holes are circumferentially arranged at the connection between the nozzle 1 and the outer guide tube 3, and the screws 13 are threadedly connected to the screw holes; by adding multiple screws 13, the connection between the nozzle 1 and the outer guide tube 3 can be strengthened, thereby preventing the nozzle 1 from falling off due to excessive water pressure.

[0022] In this embodiment, the angle between the piston slope 12 and the central axis of the flow regulating device is less than or equal to 10 degrees; the smaller the curvature of the channel, the smaller the pressure loss, which increases the range of the fire monitor and improves the operating capacity.

[0023] A variable flow injection device described in this embodiment includes a nozzle 1 and a guide tube, the guide tube includes a hollow structure inner guide tube 2 and an outer guide tube 3, the inner guide tube 2 is placed in the outer guide tube 3, and the inner guide tube 2 and the outer guide tube 3 are on the same central axis, and a plurality of partitions 4 connected to the inner wall of the outer guide tube 3 are arranged circumferentially along the outer surface of the inner guide tube 2, and the plurality of partitions 4 evenly divide the space between the inner guide tube 2 and the outer guide tube 3 into a plurality of flow channels, which can effectively eliminate turbulence, improve the concentration of the injection, and increase the range; a plurality of semicircular injection ports 5 are circumferentially arranged at the front end of the nozzle 1, and the injection ports 5 obliquely penetrate the interior of the nozzle 1 and form an inclined groove 6 inside the nozzle 1, and the middle area surrounded by the plurality of circumferentially arranged injection ports 5 is a hollow structure. A front piston 10 that fits in the gap with the injection port 5 is provided at the hollow structure of the nozzle 1, and the cross-sectional area of ​​the water flow channel formed by the outer cylindrical surface of the front piston 10 and the inclined groove 6 is adjusted by advancing and contracting the front piston 10 in the nozzle 1. A flow regulating device is provided inside the inner guide tube 2, and the flow regulating device includes a push rod bin 7, a push rod 8 and a piston. The piston includes a front piston 10 and a rear piston 11 that are fixedly connected. The push rod bin 7 is fixed to the right end of the inner guide tube 2, one end of the push rod 8 is movably slidably connected to the push rod bin 7, and the other end of the push rod 8 is connected to the rear piston 11. The power source of the push rod bin 7 is generally pneumatic, electric or hydraulic, and the push rod 8 is pushed or contracted by the push rod bin 7 to adjust the cross-sectional area of ​​the water flow channel formed by the outer cylindrical surface of the front piston 10 and the inclined groove 6. The cross-sectional area of ​​the water flow channel formed by the combination is a piston slope 12 formed at the connection between the front piston 10 and the rear piston 11. The angle between the piston slope 12 and the central axis of the flow regulating device is less than or equal to 10 degrees. The smaller the curvature of the channel, the smaller the pressure loss, which increases the range of the fire monitor and improves the operating capacity. The outer surface of the nozzle 1 is sealed with the inner wall of the guide outer tube 3. Several screw holes are circumferentially arranged at the connection between the nozzle 1 and the guide outer tube 3, and the screws 13 are threadedly connected to the screw holes. By adding multiple screws 13, the connection between the nozzle 1 and the guide outer tube 3 can be strengthened to prevent the nozzle 1 from falling off due to excessive water pressure. An annular groove 14 is provided on the outer surface where the nozzle 1 is connected to the guide outer tube 3. An outer sealing ring 15 is provided in 14, and the outer sealing ring 15 fits tightly with the inner wall of the guide outer tube 3. The outer sealing ring 15 can prevent water from leaking out from the connection between the nozzle 1 and the guide outer tube 3. An annular groove 2 16 is provided on the outer surface where the rear piston 11 is connected to the inner wall of the guide inner tube 2. An inner sealing ring 17 is provided in the annular groove 16. The inner sealing ring 17 fits tightly with the inner wall of the guide inner tube 2. The inner sealing ring 17 can prevent water from entering the push rod bin 7, causing damage to the push rod bin 7 and making it impossible to push or retract the push rod 8; in actual use, the push rod bin 7 pushes the push rod 8 to extend, and the push rod 8 pushes the front piston 10 to the front end. The cross-sectional area of ​​the water flow channel formed by the outer cylindrical surface of the front piston 10 and the inclined groove 6 is the smallest, and the spraying device will spray at the minimum flow rate;When the push rod 8 retracts, the front piston 10 retreats to its limit position. The cross-sectional area of ​​the water flow channel formed by the outer cylindrical surface of the front piston 10 and the inclined groove 6 is maximized, and the spray device will spray at the maximum flow rate. The front piston 10 can also be controlled to be between the two limit positions to obtain other spray flow rates.

[0024] The present invention is provided with a plurality of semicircular injection ports in the circumferential direction of the front end of the nozzle. The injection ports penetrate the interior of the nozzle obliquely upward and form an oblique groove inside the nozzle. The nozzle is matched with a piston to flexibly adjust the cross-sectional area of ​​the water flow channel formed by the outer cylindrical surface of the front piston and the oblique groove, thereby controlling the water flow rate. The injection distance is adjusted by controlling the size of the water flow rate. The fluid channel inside the injection device has a small degree of curvature, so that the pressure loss is small and the range is increased. The space between the inner guide tube and the outer guide tube is divided into multiple flow channels by a partition, which can effectively eliminate turbulence, improve the injection concentration and increase the range.

[0025] The above is only a preferred embodiment of the patent of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the patent of the present invention. These improvements and modifications should also be regarded as the scope of protection of the patent of the present invention.

Claims

1. A variable flow injection device, characterized in that: The invention comprises a nozzle (1) and a flow guide tube, wherein the flow guide tube comprises a flow guide inner tube (2) and a flow guide outer tube (3) of a hollow structure, wherein the flow guide inner tube (2) is arranged inside the flow guide outer tube (3), and the flow guide inner tube (2) and the flow guide outer tube (3) are located on the same central axis, and a plurality of partitions (4) connected to the inner wall of the flow guide outer tube (3) are arranged circumferentially along the outer surface of the flow guide inner tube (2), and the plurality of partitions (4) evenly divide the space between the flow guide inner tube (2) and the flow guide outer tube (3) into a plurality of flow channels; the nozzle (1) is a cylindrical structure, and the outer surface of the nozzle (1) is sealedly connected to the inner wall of the flow guide outer tube (3); a plurality of semicircular injection ports (5) are arranged circumferentially at the front end of the nozzle (1), and the injection ports (5) obliquely penetrate the interior of the nozzle (1) upward and form an oblique groove (6) inside the nozzle (1); and the middle area surrounded by the plurality of circumferentially arranged injection ports (5) is A hollow structure; a flow regulating device is arranged inside the flow guiding inner tube (2), the flow regulating device comprising a push rod bin (7), a push rod (8) and a piston; the push rod bin (7) is fixed to the right end inside the flow guiding inner tube (2); one end of the push rod (8) is movably slidably connected to the push rod bin (7); the piston comprises a front section piston (10) and a rear section piston (11) which are fixedly connected; the front section piston (10) and the rear section piston (11) are both cylindrical structures; the outer surface of the front section piston (10) is in close contact with the gap of the injection port (5); the outer cylindrical surface of the front section piston (10) and the inclined groove (6) are combined to form a water flow channel; the rear section piston (11) is in close contact with the inner wall of the flow guiding inner tube (2); a piston inclined surface (12) is formed at the connection between the front section piston (10) and the rear section piston (11); the rear section piston (11) is fixedly connected to the other end of the push rod (8); An annular groove (14) is provided on the outer surface of the nozzle (1) connected to the flow guide outer tube (3), an outer sealing ring (15) is provided in the annular groove (14), and the outer sealing ring (15) is tightly fitted with the inner wall of the flow guide outer tube (3); A second annular groove (16) is provided on the outer surface of the rear piston (11) connected to the inner wall of the flow guiding inner tube (2), and an inner sealing ring (17) is provided in the second annular groove (16). The inner sealing ring (17) is tightly fitted to the inner wall of the flow guiding inner tube (2).

2. A variable flow injection device according to claim 1, characterized in that: A plurality of screw holes are circumferentially arranged at the connection between the nozzle (1) and the flow guide outer tube (3), and the screws (13) are threadedly connected to the screw holes.

3. A variable flow injection device according to claim 1, characterized in that: The included angle between the piston inclined surface (12) and the central axis of the flow regulating device is less than or equal to 10 degrees.

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