Three-phase jet flow fire monitor capable of preventing foreign matters from entering

Abstract

The invention relates to a three-phase jet fire monitor capable of preventing foreign matters from entering, in particular to a three-phase jet fire monitor capable of automatically sealing, which is characterized by comprising a powder pipe, a connecting seat, a conical head and a barrel cover, the barrel cover covers the outer side of the connecting seat, the front end of the powder pipe is connected with the connecting seat, and the front end of the connecting seat is connected with the conical head; an eccentric butterfly cover is arranged at the front end of the conical head; a pair of first magnets is arranged on the end face of the conical head, a pair of second magnets is arranged on the eccentric butterfly cover, and the eccentric butterfly cover is parallel to the end face of the conical head under the action of magnetic force, so that a powder outlet pipe cavity of the conical head is sealed. The powder pipe is provided with a powder storage pipe cavity, the connecting seat is provided with a powder passing pipe cavity, and the powder storage pipe cavity, the powder passing pipe cavity and the powder outlet pipe cavity are communicated in sequence; the eccentric butterfly cover is arranged at the front end of the powder outlet pipe cavity and used for opening and closing the powder outlet pipe cavity.

Description

Technical Field

[0001] This invention relates to a three-phase jet fire monitor that prevents foreign objects from entering, and more specifically to a three-phase jet fire monitor capable of automatic sealing. Background Technology

[0002] With socio-economic development, fire has become one of the major disasters threatening public safety and social development. The increase in high-rise buildings and chemical plants in cities has placed higher demands on fire prevention and fighting.

[0003] Currently, with the development of science and technology and the improvement of emergency management capabilities, many fire extinguishing technologies have emerged for different scenarios and types of combustibles. Among them, three-phase jet fire extinguishing technology, due to its ability to fully utilize the performance advantages of multiple extinguishing agents and its characteristics of high fire extinguishing efficiency, long range, and strong resistance to reignition, has begun to be applied in key fire prevention areas such as chemical plants and has experienced rapid development. Three-phase jet fire extinguishing technology combines powdered fire extinguishing agents with water-based fire extinguishing agents to form a "solid-liquid-gas" three-phase composite spray state, achieving good fire extinguishing results in fire extinguishing tests. Compared with traditional water-based fire extinguishing agents, which suffer from drawbacks such as easy evaporation and loss, strong flowability, making it difficult to remain on the surface of flammable materials to provide a continuous oxygen barrier and resulting in low fire extinguishing efficiency, three-phase jet fire extinguishing technology can fully utilize the fire extinguishing performance advantages of each extinguishing agent, improve the physical properties of the mixed composite fire extinguishing agent, and form a fire extinguishing agent with stronger viscosity and better fire extinguishing effect.

[0004] Currently, the extinguishing agents used in three-phase jet fire suppression technology mainly include dry powder extinguishing agents and water-based extinguishing agents. Dry powder extinguishing agents have high extinguishing efficiency, asphyxiation and covering effects, and dilution and cooling effects. Furthermore, their surface microencapsulation treatment provides water repellency, facilitating combined spraying with water-based extinguishing agents from the fire monitor nozzle without clogging the nozzle. Water-based extinguishing agents have a long range and low cost.

[0005] Currently, three-phase jet fire monitors for dry powder extinguishing agents exist. However, the powder nozzle of these monitors is directly exposed to the atmosphere. When the monitor is only spraying water, water can easily enter the powder nozzle; when the monitor is not operating, sand and other foreign objects can easily enter, both of which can affect the spraying effect. Therefore, there is a need to develop a three-phase jet fire monitor with an automatically opening and closing powder nozzle that can open and close automatically depending on whether dry powder is being sprayed.

[0006] Publication No. (CN102886111A) discloses a dual-exting agent spray gun and its method, which allows water or foam extinguishing agent to be ejected from an annular nozzle and mixed with ultrafine dry powder in the center to form a jet. Publication No. (CN103845835A) discloses a multifunctional fire monitor and its application, which can realize the single spraying of water or foam extinguishing agent or ultrafine dry powder extinguishing agent, as well as the combined spraying of water or foam extinguishing agent and ultrafine dry powder extinguishing agent. Publication No. (CN201591928U) discloses a tube-in-tube composite jet fire monitor, which realizes the separate input and simultaneous spraying of multiple extinguishing agents. Publication No. (CN201906381U) provides a composite jet fire gun that can simultaneously spray multiple extinguishing agents with good mixing effect. Publication No. (CN205867372U) discloses a fire water monitor that combines a dry powder tube with a water spraying tube to realize the combined spraying of dry powder and water, and the state of the water can be adjusted between water column and water mist. Publication No. CN209900523U discloses a composite jet fire extinguishing device. It utilizes a first and second connecting pipe to simultaneously transmit foam or water-based extinguishing agents and nitrogen-driven dry powder, which is then sprayed synchronously through an outer and inner nozzle, ensuring the stability of the composite jet. The nozzles mitigate the problem of poor coordinated spraying effect caused by the outward expansion and dispersion of dry powder driven by high-pressure nitrogen. Publication No. CN213852872U discloses a composite jet fire monitor. While the aforementioned fire monitors or fire nozzles can perform composite spraying, their powder pipe ends are directly connected to the atmosphere, lacking devices such as butterfly covers to block the central powder inlet when the fire monitor or fire nozzle is not spraying powder extinguishing agent, preventing the entry of water, sand, or other foreign objects. Furthermore, the performance of the aforementioned powder pipe ends cannot be altered by adding other components, resulting in poor expandability.

[0007] Publication number CN204767111U discloses a mixed jet fire nozzle with a detachable nozzle. Patent CN211752076U provides a fire-fighting device with an extended powder nozzle and a detachable extension tube. However, the nozzles or powder nozzles of the above patents are not equipped with devices such as butterfly covers to block the central powder inlet and prevent water, sand, or other foreign objects from entering when the fire monitor or fire nozzle is not spraying powder extinguishing agent. Publication number CN211752076U discloses a fire-fighting device with an extended powder nozzle. Although its application scenarios can be expanded by changing different nozzles, the fire nozzle disclosed therein is pre-mixed with water / foam premix and hydrophobic ultrafine dry powder in a mixing chamber before spraying. Even if the nozzle is changed, its mixing effect will not be changed. Summary of the Invention

[0008] The purpose of this invention is to provide a three-phase jet fire monitor that prevents foreign objects from entering, effectively preventing sand, water and other foreign objects from entering the powder pipe when the fire monitor is not spraying dry powder, thus affecting the normal operation of the fire monitor.

[0009] To achieve the above objectives, the technical solution adopted by this invention is as follows: A three-phase jet fire monitor for preventing foreign objects from entering includes a powder pipe, a connecting seat, a conical head, and a barrel cover. The barrel cover covers the outside of the connecting seat. The front end of the powder pipe is connected to the connecting seat, and the front end of the connecting seat is connected to the conical head. An eccentric butterfly cover is provided at the front end of the conical head. A pair of first magnets are provided on the end face of the conical head, and a pair of second magnets are provided on the eccentric butterfly cover. Under the action of magnetic force, the eccentric butterfly cover is parallel to the end face of the conical head, thereby sealing the powder outlet cavity of the conical head.

[0010] Furthermore, the powder pipe is provided with a powder storage cavity, and the connecting seat is provided with a powder passage cavity. The powder storage cavity, the powder passage cavity, and the powder outlet cavity are connected in sequence. The eccentric butterfly cover is provided at the front end of the powder outlet cavity to realize the opening and closing of the powder outlet cavity.

[0011] Furthermore, the barrel cover includes a front cover, a middle cover, and a rear cover. The middle cover is connected to the connecting seat, the front cover is slidably connected to the front of the middle cover, and the rear cover is threadedly connected to the rear end of the middle cover.

[0012] Furthermore, the barrel cover is equipped with a telescopic cylinder, the cylinder body of which is connected to the rear cover, and the telescopic rod of which is connected to the front cover through a connector. The telescopic rod drives the front cover to slide on the middle cover.

[0013] Furthermore, the front end of the middle cover is provided with a limiting part, and the rear end of the front cover is provided with a stop part; a first sealing ring is provided on the stop part.

[0014] Furthermore, the tapered head is threaded to the front end of the connector, and the powder tube is threaded to the rear end of the connector; the front end of the connector is provided with a base plate, the rear end face of the tapered head is attached to the base plate, and a second sealing ring is provided on the rear end face of the tapered head.

[0015] Furthermore, the eccentric butterfly cover is rotatably connected to the conical head via an eccentric shaft.

[0016] Furthermore, the first magnet is symmetrically arranged on the conical head, and the second magnet is symmetrically arranged on the eccentric butterfly cover.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The three-phase jet fire monitor has a powder pipe in the middle, and the front end of the powder pipe is connected to a connecting seat. The front end of the connecting seat is threaded with a conical head, which allows the annular water flow ejected from the muzzle to converge along the axis of the fire monitor head due to the Coanda effect. Compared with other fire monitors without conical heads, the water flow rate is increased to a certain extent, thereby increasing the range of the fire monitor.

[0018] 3. The top of the conical head is equipped with an eccentric butterfly cover. Under the action of magnetic force, the eccentric butterfly cover seals the conical head when the fire monitor is not in use, which can effectively prevent water, sand and other foreign objects from entering the powder pipe when the three-phase jet fire monitor is not spraying dry powder, thus affecting the normal operation of the fire monitor.

[0019] 4. Magnets are installed on both sides of the eccentric butterfly cover and on the conical head. When the three-phase jet fire monitor is only spraying water or not in operation, the eccentric butterfly cover seals the conical head under the action of magnets, preventing water from entering the powder pipe when only water is being sprayed and preventing foreign objects such as sand and dust from entering the powder pipe when the fire truck is not in operation. When the three-phase jet fire monitor sprays dry powder, the butterfly cover opens because the pressure on both sides of the butterfly cover's rotating shaft is unbalanced, and the pressure difference is greater than the magnetic attraction force, allowing the fire monitor to spray dry powder. After spraying, the air pressure inside the powder pipe decreases, and the pressure difference applied to both sides of the butterfly cover's rotating shaft is less than the magnetic attraction force, causing the butterfly cover to close under the action of the magnetic field. This structure requires no additional energy to drive it, is simple to maintain, and saves energy. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a three-phase jet fire monitor designed to prevent foreign objects from entering.

[0021] Figure 2 This is a cross-sectional view of a three-phase jet fire monitor designed to prevent foreign objects from entering.

[0022] Figure 3 This is a schematic diagram of the sealing state of the conical head.

[0023] Figure 4 This is a diagram illustrating the state of the cone-shaped head during check-in.

[0024] Figure 5 This is a schematic diagram of the front cover in its retracted state.

[0025] Figure 6 This is a schematic diagram without the conical head installed. Detailed Implementation

[0026] like Figure 1 and Figure 2 As shown, a three-phase jet fire monitor for preventing foreign objects from entering includes a powder pipe 1, a connecting seat 2, a conical head 3, and a barrel cover 4. The barrel cover 4 covers the outside of the connecting seat 2. The front end of the powder pipe 1 is connected to the connecting seat 2, and the front end of the connecting seat 2 is connected to the conical head 3. An eccentric butterfly cover 5 is provided at the front end of the conical head 3. A pair of first magnets 6 are provided on the end face of the conical head 3, and a pair of second magnets 7 are provided on the eccentric butterfly cover 5. When the fire monitor is not in use, the eccentric butterfly cover 5 is parallel to the end face of the conical head 3 under the action of magnetic force, so that the powder outlet cavity of the conical head 3 is always in a sealed state, preventing foreign objects from entering the powder pipe 1 and affecting the normal operation of the fire monitor.

[0027] The conical head 3 is threaded to the front end of the connecting seat 2, and the powder pipe 1 is threaded to the rear end of the connecting seat 2. A base plate 21 is provided at the front end of the connecting seat 2, and the rear end face of the conical head 3 is attached to the base plate 21. A second sealing ring 22 is provided on the rear end face of the conical head 3. The conical head 3 is fixed to the front end of the connecting seat 2 by a threaded connection, and the Coanda effect can be used to make the annular water flow surrounding the connecting seat 2 converge into a solid water column along the outer wall of the conical head 3. The connecting seat 2 is installed on the middle cover 42. The front cover 41 is installed at the front of the middle cover 42, and its back-and-forth movement allows the fire monitor to switch between a direct jet pattern and a spray jet pattern. The rear cover 43 is connected to the middle cover 42 on one side and to the monitor body on the other side. The powder pipe 1 is inserted into the fire monitor from the rear cover 43 and extends along its axis inside it. The top of the powder pipe 1 is threaded onto the connecting seat 2.

[0028] The powder pipe 1 is provided with a powder storage cavity, and the connecting seat 2 is provided with a powder passage cavity. The powder storage cavity, the powder passage cavity, and the powder outlet cavity are connected in sequence. The eccentric butterfly cover 5 is located at the front end of the powder outlet cavity and is used to open and close the powder outlet cavity. When the fire monitor performs three-phase jet fire extinguishing operation, the fire monitor sprays water and dry powder simultaneously. Water flows in from the powder pipe 1 and is ejected in a ring from the nozzle. Dry powder flows in from the powder storage cavity and is ejected from the powder outlet cavity. The water flow carries the dry powder to the fire location to achieve the fire extinguishing operation.

[0029] like Figure 6 As shown, the cannon casing 4 includes a front casing 41, a middle casing 42, and a rear casing 43. The middle casing 42 is connected to the connecting seat 2. The front casing 41 is slidably connected to the front of the middle casing 42, and the rear casing 43 is threadedly connected to the rear end of the middle casing 42. In actual use, water-based extinguishing agent or pure water flows out from the fire monitor body, enters the fire monitor through the rear casing 43, then flows through the annular cross-sectional flow channel formed by the rear casing 43 and the powder pipe 1, and then flows into the annular cross-sectional flow channel formed by the middle casing 42 and the connecting seat 2. Due to the combined action of the front bottom plate 21 of the connecting seat 2 and the middle casing 42, the inner and outer diameters of the annular flow cross-section increase, the flow cross-sectional area decreases, and the flow velocity increases.

[0030] like Figure 5As shown, a telescopic cylinder 8 is installed on the barrel cover 4. The cylinder body of the telescopic cylinder 8 is connected to the rear cover 43, and the telescopic rod of the telescopic cylinder 8 is connected to the front cover 41 through a connector. The telescopic rod drives the front cover 41 to slide on the middle cover 42. When the telescopic cylinder 8 retracts, it drives the front cover 41 to retract, and the water flow is sprayed out in a mist. When the telescopic cylinder 8 extends, it drives the front cover 41 to move forward. The water flow is blocked by the front cover 41, changing its outward expansion trend and moving forward. Under the influence of the Coanda effect brought by the cone head 3 and the low-pressure area inside the annular water flow, it gradually converges into a solid water column and is sprayed out in a direct current. When the three-phase jet fire monitor is used for long-range three-phase jet fire extinguishing operations, the three-phase jet fire monitor needs to be adjusted to the direct current mode. Dry powder enters from the end of powder pipe 1 under the action of air source pressure, flows into connecting seat 2, and continues to move to cone head 3 under the action of air pressure. Under the action of air pressure, the eccentric butterfly cover 5 is opened and sprayed into the atmosphere or onto the axis of the water column sprayed by the fire monitor. It is then carried by the solid water column to the fire location to achieve fire extinguishing operation.

[0031] The front end of the middle cover 42 is provided with a limiting part, and the rear end of the front cover 41 is provided with a stop part; the stop part is provided with a first sealing ring 23, and the limiting part can effectively prevent the front cover 41 from falling off the middle cover 42 under the pushing action of the telescopic rod.

[0032] like Figure 3 and Figure 4 As shown, the eccentric butterfly cover 5 is rotatably connected to the conical head 3 via an eccentric shaft. The first magnet 6 is symmetrically arranged on the conical head 3, and the second magnet 7 is symmetrically arranged on the eccentric butterfly cover 5. The S-pole of the first magnet 6 faces the center, and the N-pole of the second magnet 7 faces the center. The first magnet 6 and the second magnet 7 generate magnetic force, causing the eccentric butterfly cover 5 to seal the conical head 3. Under the action of magnetic force, the eccentric butterfly cover 5 is in a closed state when the fire monitor is only spraying water or not in operation, preventing water from entering the powder pipe 1 when spraying water and preventing foreign objects such as sand and dust from entering the powder pipe 1 when the fire truck is not in operation. When the fire monitor sprays dry powder, the dry powder moves under the pressure provided by the air pressure source. The air pressure acts on the eccentric butterfly cover 5, and because the pressure on both sides of the eccentric butterfly cover 5 is unbalanced, and the pressure difference is greater than the magnetic attraction, the eccentric butterfly cover 5 rotates and opens, allowing the fire monitor to spray dry powder. After spraying, because the air pressure in the powder pipe 1 decreases, the pressure difference applied to both sides of the eccentric butterfly cover 5 is less than the magnetic attraction, and the butterfly cover closes under the action of the magnetic field. The eccentric butterfly cover 5 automatically switches between open and closed states under the action of magnetic force. This structure does not require additional energy to drive it, is simple to maintain, reliable in operation, and saves energy.

[0033] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A three-phase jet fire monitor for preventing foreign objects from entering, characterized in that, The device includes a powder tube, a connecting seat, a conical head, and a barrel cover. The barrel cover covers the outside of the connecting seat. The front end of the powder tube is connected to the connecting seat, and the front end of the connecting seat is connected to the conical head. An eccentric butterfly cover is provided at the front end of the conical head. A pair of first magnets are provided on the end face of the conical head, and a pair of second magnets are provided on the eccentric butterfly cover. Under the action of magnetic force, the eccentric butterfly cover is parallel to the end face of the conical head, thus sealing the powder outlet cavity of the conical head.

2. The three-phase jet fire monitor for preventing foreign objects from entering according to claim 1, characterized in that, The powder pipe is provided with a powder storage cavity, and the connecting seat is provided with a powder passage cavity. The powder storage cavity, the powder passage cavity, and the powder outlet cavity are connected in sequence. The eccentric butterfly cover is provided at the front end of the powder outlet cavity and is used to realize the opening and closing of the powder outlet cavity.

3. A three-phase jet fire monitor for preventing foreign objects from entering, as described in claim 1, is characterized in that, The barrel cover includes a front cover, a middle cover, and a rear cover. The middle cover is connected to the connecting seat, the front cover is slidably connected to the front of the middle cover, and the rear cover is threadedly connected to the rear end of the middle cover.

4. A three-phase jet fire monitor for preventing foreign objects from entering, as described in claim 3, is characterized in that, The barrel cover is equipped with a telescopic cylinder. The cylinder body of the telescopic cylinder is connected to the rear cover, and the telescopic rod of the telescopic cylinder is connected to the front cover through a connector. The telescopic rod drives the front cover to slide on the middle cover.

5. A three-phase jet fire monitor for preventing foreign objects from entering, as described in claim 4, is characterized in that, The front end of the middle cover is provided with a limiting part, and the rear end of the front cover is provided with a blocking part; a first sealing ring is provided on the blocking part.

6. A three-phase jet fire monitor for preventing foreign objects from entering, as described in claim 1, is characterized in that, The tapered head is threaded to the front end of the connector, and the powder tube is threaded to the rear end of the connector; the front end of the connector is provided with a base plate, the rear end face of the tapered head is attached to the base plate, and a second sealing ring is provided on the rear end face of the tapered head.

7. A three-phase jet fire monitor for preventing foreign objects from entering, as described in claim 1, is characterized in that, The eccentric butterfly cover is rotatably connected to the conical head via an eccentric shaft.

8. A three-phase jet fire monitor for preventing foreign objects from entering, as described in claim 1, is characterized in that, The first magnet is symmetrically arranged on the conical head, and the second magnet is symmetrically arranged on the eccentric butterfly cover.

Images