CN104958851A - Natural intake type foam generator - Google Patents

Abstract

The invention discloses a natural intake type foam generator. The natural intake type foam generator comprises a mother pipe, an intake cover, a separation cover, a first bracket, a second bracket, an impeller set, a turbine set, a main shaft, a guider, a fairing cone and a fairing cover, wherein the intake cover and the fairing cover are respectively mounted at the two ends of the mother pipe; the first bracket is mounted in an inner hole of one end, close to the intake cover, of the mother pipe; the second bracket is mounted in an inner hole of one end, close to the fairing cover, of the mother pipe; the fairing cone is mounted on the second bracket; the two ends of the main shaft are respectively combined with bearings mounted on the first bracket and the fairing cone; the separation cover is mounted in the inner hole of the end, close to the intake cover, of the mother pipe; an inner hole of a cone frustum type cylinder of the separation cover is an air storage chamber; the outer wall of the cone frustum type cylinder, the annular surface of an annular piece of the separation cove and the inner wall of the mother pipe define a liquid storage chamber; a liquid inlet is formed in the wall of the mother pipe in the liquid storage chamber; a liquid spraying hole is formed in the annular surface; the impeller set is mounted on the main shaft, and is positioned in the air storage chamber; the guider is mounted on the main shaft, and is positioned between the annular piece of the separation cover and the fairing cone; and the turbine set is mounted on the guider.

Description

A naturally aspirated foam generator

technical field

The invention belongs to the field of foam generators, and relates to a foam generator used for fire fighting.

Background technique

The existing foam generators can be divided into: active air supply mode and natural air intake mode according to the air intake mode. The active air supply method is that the gas input into the main pipe is compressed pressurized gas, so ancillary equipment such as air compressors and gas storage tanks are required, which not only increases the cost, but also increases the carrying of ancillary equipment during use. , causing inconvenience to firefighters. The natural air intake method is that the gas input into the main pipe is natural air. The low-expansion foam generator recommended by the national standard GB15308-2006 "Foam Fire Extinguishing Agent" is a foam generator of a natural intake mode, including different diameters. Two-stage cavity, the liquid enters the large-diameter cavity through the small-diameter cavity at high speed, and spreads rapidly to the surroundings, so that the gas-liquid two-phase disperses and mixes to form foam. Therefore, the pressure of the liquid supply must be large enough to ensure that enough air is inhaled for dispersion and mixing, but a sufficient pressure will cause the liquid flow rate to be too high, resulting in uneven gas-liquid mixing and a decrease in the foam expansion ratio.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a natural air-intake foam generator, which not only mixes gas and liquid uniformly, but also can realize sufficient foaming, and does not need matching gas booster equipment.

The natural air-intake foam generator of the present invention includes a main pipe, an air inlet cover, a partition cover, a first support, a second support, an impeller group, a turbine group, a main shaft, a guide, a rectifying cone and a fairing; The main pipe is a round pipe, the air intake cover is installed at one end of the main pipe to form an air intake channel, the fairing is installed at the other end of the main pipe to form a foam output channel, and the first bracket is installed in the inner hole of the main pipe near the end of the air intake cover And it is fixedly connected with the inner wall of the main pipe, and the second bracket is installed in the inner hole of the main pipe near the end of the fairing and is fixedly connected with the inner wall of the main pipe; the rectifying cone is a cone and is installed on the second bracket. The installation method is: The center line of the rectifying cone coincides with the center line of the second bracket, and the cone top of the rectifying cone faces the direction of the fairing; the center part of the first bracket and the center part of the rectifying cone are respectively equipped with bearings combined with the main shaft, and one end of the main shaft is connected to the main shaft. The bearing combination installed in the center of the first bracket, the other end of the main shaft is combined with the bearing installed in the center of the rectifying cone; There are multiple spray holes, and the ring piece is installed around the small end of the truncated cone-shaped cylinder, and its ring surface is perpendicular to the center line of the truncated cone-shaped cylinder; the partition cover is installed in the inner hole of the main pipe near the end of the air inlet cover And after the first support, the large end of the truncated cone-shaped cylinder of the partition cover faces the direction of the air inlet cover and the outer wall of the large end of the truncated cone-shaped cylinder is fixedly connected with the inner wall of the main pipe, and the outer surface of the annular piece of the partition cover is connected with the inner wall of the main pipe. The inner wall of the main pipe is fixedly connected, the inner hole of the frustum-shaped cylinder of the partition cover is the gas storage chamber, the outer wall of the frusto-conical cylinder of the partition cover, the ring surface of the ring piece and the inner wall of the main pipe form a liquid storage room, which forms a liquid storage chamber. There is a liquid inlet on the main pipe wall of the chamber; the impeller group is composed of at least three impellers with different diameters, and each impeller is respectively installed on the main shaft and located in the gas storage chamber; the guide is a cone and a truncated cone. Combination body, the large end of the frustum of the cone is connected with the bottom of the cone and the diameter of the large end of the frustum of the cone is the same as the diameter of the bottom of the cone. The apex of the cone of the device is facing the direction of the annular piece of the partition cover. The turbine group is composed of at least two turbines. Each turbine is installed on the conical truss of the guide. The space between the large ends is a gas-liquid mixing chamber.

The natural air-intake foam generator of the present invention, the length of the frustum-shaped barrel of its partition cover is preferably the length of the main pipe length The outer diameter of the large end of the truncated conical cylinder of the partition cover is the same as the inner diameter of the main pipe, and the outer diameter of the small end is preferably the outer diameter of the larger end.

The natural air-intake foam generator of the present invention, its first bracket, the second bracket are all made up of the support body and at least three connecting rods that are uniformly distributed around the support body and fixedly connected with the support body, the connecting rods of the second bracket are preferably A streamlined structure that shrinks away from the support.

In the natural air-intake foam generator of the present invention, the ratio of the total area of the liquid spray holes on the ring surface of the ring sheet of the partition cover to the area of the ring surface is 0.25-0.33. The number of liquid outlet holes is 4 to 6, which are evenly distributed on the ring surface at intervals of equal angles.

The natural air intake type foam generator of the present invention, one end of the air intake cover matches the main pipe, and the other end is an air inlet, and its shape is a streamlined structure that shrinks toward the direction of the air inlet; one end of the fairing matches the main pipe, The other end is a foam outlet, and its shape is a streamlined structure that shrinks toward the direction of the foam outlet.

The working principle of the natural air-intake foam generator of the present invention: the foaming liquid with a certain pressure enters the liquid storage chamber through the liquid inlet provided on the main pipe, and then enters from the outlet provided on the ring surface of the partition cover. The liquid hole sprays into the gas-liquid mixing chamber at high speed, and the natural air enters the gas-liquid mixing chamber through the air intake cover and the air storage chamber. In the gas-liquid mixing chamber, the high-speed foaming liquid is mixed with air for one foaming. The high-speed foam impacts the turbine blades located behind the gas-liquid mixing chamber, thereby driving the turbine blades to rotate at high speed to stir the foam liquid to form secondary foaming. The foam liquid after the secondary foaming is sprayed out through the outlet of the fairing. The rotation drives the main shaft and the impeller set installed on the main shaft to rotate at a high speed, and a large amount of air is sucked into the air storage chamber, pressurized and sent into the gas-liquid mixing chamber.

Compared with the prior art, the present invention has the following beneficial effects:

1. The naturally air-intake foam generator of the present invention can make the high-speed foaming liquid and air mix in the gas-liquid mixing chamber for primary foaming, and then achieve secondary foaming by stirring the turbine blades behind the gas-liquid mixing chamber , so the gas-liquid mixture is uniform, which can ensure complete foaming.

2. The high-speed foam after primary foaming is used to make the turbine blades rotate at high speed, thereby driving the main shaft and the impeller group to rotate at high speed, not only can a large amount of air be sucked into the air storage chamber, pressurized, and then sent into the gas-liquid mixing chamber to meet the primary foaming air. Need, make the primary foaming effect better, and can save energy, without adding supporting gas booster equipment.

3. The structure of the guide is beneficial to improve the effect of primary foaming and secondary foaming.

4. The air intake hood is a streamlined structure that shrinks toward the air inlet, which can prevent the air from forming a vortex around it, and the external air can enter the air storage chamber through the air intake hood to the maximum extent.

5. The shape and structure of the rectifying cone and the second bracket can reduce the energy loss of the foam after secondary foaming, and cooperate with the streamlined fairing that shrinks toward the foam outlet to improve the fire-fighting effect of the foam.

6. The naturally air-intake foam generator of the present invention is compact in structure, easy to carry and easy to use.

Description of drawings

Fig. 1 is the structural representation of the natural air intake type foam generator of the present invention;

Fig. 2 is the structural representation of the partition cover in the natural air-intake foam generator of the present invention;

Fig. 3 is the right view of Fig. 2;

Fig. 4 is a structural schematic diagram of the first bracket and a combination diagram with the mother pipe;

Fig. 5 is a schematic structural view of the second bracket and a diagram of its combination with the mother pipe;

In the figure, 1 main pipe, 2 air intake cover, 3 gas storage chamber, 4 liquid inlet, 5 partition cover, 5-1 frustum-shaped cylinder, 5-2 ring piece, 5-3 liquid spray hole, 6 The first support, 6-1 support body, 6-2 connecting rod, the second support 7, 7-1 support body, 7-2 connecting rod, 8 impeller group, 9 turbine group, 10 liquid storage chamber, 11 gas-liquid mixing Chamber, 12 spindles, 13 guides, 14 rectifying cones, 15 fairings.

Detailed ways

The natural air-intake foam generator of the present invention will be described in further detail below through embodiments in conjunction with the accompanying drawings.

In the present embodiment, the structure of the naturally aspirated foam generator is shown in Figure 1, consisting of a main pipe 1, an air intake cover 2, a partition cover 5, a first support 6, a second support 7, an impeller group 8, and a turbine group 9. Main shaft 12, guider 13, rectifying cone 14 and fairing cover 15.

As shown in Figure 1, the main pipe 1 is a round pipe, one end of the air intake cover 2 is matched with the main pipe, and the other end is an air inlet, and its shape is a streamlined structure shrinking toward the air inlet direction. One end of the cover 15 matches the main pipe, and the other end is the foam outlet, and its shape is a streamlined structure that shrinks toward the foam outlet; the air intake cover 2 is installed on one end of the main pipe to form an air intake channel, and the fairing 15 is installed on the main pipe. The other end forms the foam output channel.

As shown in Figure 4, the first bracket 6 is composed of a supporting body 6-1 and three connecting rods 6-2 that are uniformly distributed around the supporting body and are fixedly connected with the supporting body, and the included angle between adjacent connecting rods 6-2 is 120o, as shown in Figure 5, the second bracket 7 is composed of a supporting body 7-1 and four connecting rods 7-2 that are uniformly distributed around the supporting body and are fixedly connected with the supporting body, and the adjacent connecting rods 7-2 The included angle is 90o, and each connecting rod is a streamlined structure that shrinks away from the support body; The inner wall of the pipe is fixedly connected, the second bracket 7 is installed in the inner hole of the main pipe near the end of the fairing, and each connecting rod is fixedly connected with the inner wall of the main pipe.

As shown in Figure 1, the rectifying cone 14 is a cone, installed on the support body 7-1 of the second bracket, the installation method is: the center line of the rectifying cone coincides with the center line of the second bracket, the cone of the rectifying cone The top faces the direction of the fairing; the central part of the support body 6-1 of the first bracket 6 and the central part of the rectifying cone 14 are respectively equipped with bearings combined with the main shaft 12, and one end of the main shaft 12 is installed in the center of the first support support body. The bearing combination of the position, the other end of the main shaft 12 is combined with the bearing installed in the rectifying cone 14 central parts.

As shown in Figures 2 and 3, the partition cover 5 is a combination of a truncated cone-shaped cylinder 5-1 and a ring piece 5-2, and the ring piece 5-2 is installed around the small end of the truncated cone-shaped cylinder. Its annulus is perpendicular to the center line of the truncated conical cylinder; the annulus of the annulus is provided with four evenly distributed spray holes 5-3 with the same aperture, and the angle between adjacent spray holes is 90o, four The ratio of the total area of each spray hole to the area of the annulus can be selected between 0.25～0.33; Choose between, the outer diameter of the large end of the frustum-shaped cylinder of the partition cover 5 is the same as the inner diameter of the main pipe, and the outer diameter of the small end can be within the outer diameter of the larger end. Choose between. As shown in Figure 1, the partition cover 5 is installed in the inner hole of the main pipe near the end of the intake cover and behind the first bracket 6, the large end of the frustum-shaped cylinder 5-1 of the partition cover faces the direction of the intake cover 2 and The outer wall of the large end of the truncated cone-shaped cylinder is fixedly connected with the inner wall of the main pipe, the outer surface of the ring piece 5-2 of the partition cover is fixedly connected with the inner wall of the main pipe, and the inner hole of the frusto-conical cylinder of the partition cover is the gas storage chamber 3 , the outer wall of the truncated cone-shaped cylinder of the partition cover, the ring surface of the ring piece and the inner wall of the main pipe enclose a liquid storage chamber 10, and a liquid inlet 4 is opened on the wall of the main pipe surrounding the liquid storage chamber.

As shown in Figure 1, the impeller group 8 is composed of four impellers with different diameters, each impeller is respectively installed on the main shaft and located in the air storage chamber 3; the guide 13 is a combination of a cone and a truncated cone, The large end of the truncated cone is connected with the cone bottom of the cone and the diameter of the large end of the truncated cone is the same as the diameter of the cone bottom of the cone, and the diameter of the small end of the truncated cone is identical with the diameter of the cone bottom of the rectifying cone 14; the guide device 13 is installed on the main shaft and Located between the annular sheet 5-2 of the partition cover and the rectifying cone 14, the conical top of the guide faces the direction of the annular sheet of the partition cover; the turbine group 9 is composed of two turbines, and each turbine is respectively installed on the guide On the truncated cone of the device 13, the space between the annular surface of the partition cover and the big end of the truncated cone of the guide is the gas-liquid mixing chamber 11.

The present invention is not limited to the above-mentioned embodiments, and foam generators with different specific structures can be designed and manufactured according to the scope defined in the claims.

Claims (9)

1. a natural inflow formula foam maker, comprise female pipe (1), characterized by further comprising airscoop shroud (2), separate cover (5), the first support (6), the second support (7), impeller sets (8), turbine group (9), main shaft (12), guider (13), fiaring cone (14) and radome fairing (15);

Described mother's pipe (1) is pipe, one end that airscoop shroud (2) is arranged on female pipe forms inlet channel, the other end that radome fairing (15) is arranged on female pipe forms foam output channel, first support (6) is arranged on female pipe in the endoporus of airscoop shroud one end and is connected with female inside pipe wall, and the second support (7) is arranged on female pipe in the endoporus of radome fairing one end and is connected with female inside pipe wall;

Described fiaring cone (14) is cone, and install on the secondary support bracket, mounting means is: the center line of fiaring cone overlaps with the center line of the second support, the vertex of a cone of fiaring cone is towards radome fairing direction; The centre of described first support (6) centre and fiaring cone (14) is separately installed with the bearing combined with main shaft (12), one end of main shaft (12) is combined with the bearing being arranged on the first support (6) centre, and the other end of main shaft (12) combines with the bearing being arranged on fiaring cone (14) centre;

Described cover (5) of separating is for truncated cone cylindrical shell (5-1) and the assembly of circular ring plate (5-2), the anchor ring of circular ring plate is provided with multiple spray hole (5-3), circular ring plate is installed around truncated cone cylindrical shell small end end, and its anchor ring is perpendicular to the center line of truncated cone cylindrical shell; Separate cover and be arranged on female pipe in the endoporus of airscoop shroud one end and after being positioned at the first support, the large end of truncated cone cylindrical shell separating cover towards airscoop shroud direction and the inwall of the large end end outer wall of truncated cone cylindrical shell and female pipe be connected, the inwall of the circular ring plate lateral surface and female pipe of separating cover is connected, the truncated cone cylinder bore separating cover is air storage chamber (3), truncated cone cylinder body outer wall, the anchor ring of circular ring plate and the inwall of female pipe of separating cover surround fluid reservoir (10), and the female tube wall surrounding fluid reservoir offers inlet (4);

Described impeller sets (8) is made up of the impeller of at least three different-diameters, and each impeller to be arranged on respectively on main shaft and to be positioned at air storage chamber;

The assembly that described guider (13) is cone and the frustum of a cone, the large end of the frustum of a cone with connect at the bottom of the cone of cone and the diameter of the large end of the frustum of a cone and cone to bore the diameter at the end identical, guider (13) to be arranged on main shaft and between separation cover circular ring plate and fiaring cone, the cone vertex of a cone of guider is towards separation cover circular ring plate direction, described turbine group (9) is made up of at least two turbines, each turbine is arranged on the frustum of a cone of guider (13) respectively, the space of separating between the circular ring plate anchor ring of cover and the large end of the frustum of a cone of guider is gas-liquid mixed room (11).

2. natural inflow formula foam maker according to claim 1, is characterized in that the length of the truncated cone cylindrical shell separating cover (5) is female length of tube the large end external diameter of the truncated cone cylindrical shell of separation cover (5) is identical with the internal diameter of female pipe, small end external diameter is hold greatly external diameter

3. natural inflow formula foam maker according to claim 1 or 2, it is characterized in that the first support (6), the second support (7) are by supporting mass be uniformly distributed around supporting mass and form with at least three connecting rods that supporting mass is connected, the connecting rod of the second support is the streamline structure to deviating from supporting mass direction and shrinking.

4. natural inflow formula foam maker according to claim 1 or 2, is characterized in that the ratio separating the spray hole gross area and the anchor ring area that the circular ring plate anchor ring of cover (5) is arranged is 0.25 ~ 0.33.

5. natural inflow formula foam maker according to claim 3, is characterized in that the ratio separating the spray hole gross area and the anchor ring area that the circular ring plate anchor ring of cover (5) is arranged is 0.25 ~ 0.33.

6. natural inflow formula foam maker according to claim 1 or 2, it is characterized in that airscoop shroud (2) one end is mated with female pipe, the other end is air intake, and its shape is the streamline structure shunk to air intake direction; Radome fairing (15) one end is mated with female pipe, and the other end is foam outlet, and its shape is the streamline structure shunk to foam outlet direction.

7. natural inflow formula foam maker according to claim 3, it is characterized in that airscoop shroud (2) one end is mated with female pipe, the other end is air intake, and its shape is the streamline structure shunk to air intake direction; Radome fairing (15) one end is mated with female pipe, and the other end is foam outlet, and its shape is the streamline structure shunk to foam outlet direction.

8. natural inflow formula foam maker according to claim 4, it is characterized in that airscoop shroud (2) one end is mated with female pipe, the other end is air intake, and its shape is the streamline structure shunk to air intake direction; Radome fairing (15) one end is mated with female pipe, and the other end is foam outlet, and its shape is the streamline structure shunk to foam outlet direction.

9. natural inflow formula foam maker according to claim 5, it is characterized in that airscoop shroud (2) is the streamline structure shunk to air intake direction, radome fairing (15) be the streamline structure to the contraction of foam outlet direction.