CN216061797U - Mixing device for compressed air foam fire extinguishing system - Google Patents
Mixing device for compressed air foam fire extinguishing system Download PDFInfo
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- CN216061797U CN216061797U CN202121843132.2U CN202121843132U CN216061797U CN 216061797 U CN216061797 U CN 216061797U CN 202121843132 U CN202121843132 U CN 202121843132U CN 216061797 U CN216061797 U CN 216061797U
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- foam
- mixing
- fire extinguishing
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- 239000006260 foam Substances 0.000 title claims abstract description 88
- 239000007788 liquid Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000012141 concentrate Substances 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000033001 locomotion Effects 0.000 abstract description 3
- 101150114468 TUB1 gene Proteins 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Abstract
The utility model discloses a mixing device for a compressed air foam fire extinguishing system, when water and high-pressure gas enter a mixing barrel to drive an impeller to rotate, so that the water and foam concentrate are fully mixed, the impeller drives a rotating shaft to rotate, the rotating shaft drives a gear to rotate, the gear drives a rack to do linear motion, the rack drives a foam concentrate flow adjusting plate to pump in a foam concentrate pipe, and an elastic part is pulled at the moment; when the air pressure is smaller, the rotating speed of the impeller is reduced, the rotating speed of the rotating shaft driving the gear is reduced, the kinetic energy obtained by the rack is reduced, the elastic piece resets to drive the rack to move reversely, and the rack drives the flow adjusting plate to move reversely, so that the flow adjustment of the foam liquid is realized.
Description
Technical Field
The utility model relates to the technical field of fire fighting equipment, in particular to a mixing device for a compressed air foam fire extinguishing system.
Background
Foam extinguisher, when the principle of putting out a fire, can spout a large amount of carbon dioxide and foam, they can the adhesion on the combustible substance, make combustible substance and air isolated, reach the purpose of putting out a fire, and foam extinguisher divide into: the portable foam fire extinguisher, the cart-type foam fire extinguisher and the air-type foam fire extinguisher are stored in a place which is dry, cool, ventilated and convenient to take and use, and can not be close to a place with high temperature or possible exposure to the sun so as to prevent carbon acid from decomposing and losing efficacy, and anti-freezing measures are taken in winter so as to prevent freezing, and dust is frequently erased and a nozzle is dredged so as to keep the smooth;
for example, according to the "compressed air foam fluid mixing device" provided in chinese patent application No. CN201922341292.6, the compressed air and the foam mixture enter in the same direction, and the design of the gas-liquid two-phase flowing in the same direction in the mixing chamber greatly reduces the impact of the air on the foam solution and the pulsation generated thereby, and in addition, the ratio of the mixing device to the foam solution needs to be manually adjusted, which is inefficient.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a mixing device which realizes the mixing of water and foam concentrate and the adjustment of the flow rate of the foam concentrate by utilizing the kinetic energy generated by high-pressure gas.
The utility model solves the technical problems through the following technical means:
a mixing device for a compressed air foam fire extinguishing system comprises a mixing barrel (1), a rotating shaft (11), a bracket (12), an impact-resistant plate (13), an impeller (14) and a foam concentrate flow regulating component (2);
a mixing cavity is arranged in the mixing barrel (1); the rotating shaft (11) is rotationally fixed in the mixing cavity, and the impact-resistant plate (13) is fixed on the inner wall of the mixing cavity; the impeller (14) is fixed on the rotating shaft (11); the bracket (12) is fixed in the mixing cavity and is used for disturbing water flow;
the mixing barrel (1) is provided with a water inlet (15) and an air inlet (16); the bracket (12) is positioned between the water inlet (15) and the impact-resistant plate (13); the air inlet (16) is connected with a high-pressure air tank;
a foam liquid inlet is formed in the mixing barrel (1), and a foam liquid pipe (3) is installed at the foam liquid inlet; the pipe of the foam liquid pipe (3) is provided with a flow adjusting plate (31);
the foam concentrate flow regulating component (2) comprises a rack (25), a gear (24) and an elastic piece (27); the gear (24) is linked with the rotating shaft (11) through a transmission chain 26; the rack (25) is meshed with the gear (24); one end of the rack (25) is fixed with the flow adjusting plate (31), the other end of the rack is fixed with one end of the elastic piece (27), and the other end of the elastic piece (27) is fixed.
The working principle is as follows: the high-pressure gas in the foam liquid mixing device is output by the air compressor, so the air pressure and the flow rate of the high-pressure gas can be controlled by the air compressor, when the air pressure is high, the required output flow rate is larger, so more foam liquid is required, the flow rate of the foam liquid is required to be larger, when the air pressure is low, the required output flow rate is small, and the output of the foam liquid can be reduced.
According to the utility model, when water and high-pressure gas enter a mixing barrel (1), a power of water flow and the high-pressure gas drives an impeller (14) to rotate, the impeller (14) drives a rotating shaft (11) to rotate, the high-pressure gas, the water and foam concentrate are fully mixed, the rotating shaft (11) drives a gear (24) to rotate, the gear (24) drives a rack (25) to do linear motion, the rack (25) drives a foam concentrate flow adjusting plate (31) to pump in a foam liquid pipe (3), and at the moment, an elastic piece (27) is pulled; when the air pressure is small, the rotating speed of the impeller (14) is reduced, the rotating speed of the rotating shaft (11) drives the gear (24) to be reduced, the kinetic energy obtained by the rack (25) is reduced, the elastic piece (27) resets to drive the rack (25) to move in the reverse direction, and the rack (25) drives the flow adjusting plate (31) to move in the reverse direction, so that the flow of the foam liquid is adjusted.
Further, the foam concentrate flow regulating assembly (2) comprises a transmission case (21); the transmission case (21) is fixed on the outer wall of the mixing barrel (1), a sliding sleeve plate (22) is fixed in the transmission case (21), and a rotating support (23) is fixed on the sliding sleeve plate (22); the gear (24) is rotationally fixed on the rotating bracket (23); the rack (25) horizontally penetrates through the sliding sleeve plate (22) and is meshed with the gear (24); the chain (26) penetrates through the transmission box (21) and the wall of the mixing barrel (1) and is respectively sleeved on a transmission shaft of the gear (24) and the rotating shaft (11); one end of the rack (25) penetrates through the transmission case (21) and is fixed with the flow adjusting plate (31).
Furthermore, a through hole is formed in the foam liquid pipe (3); the direction of the through hole is consistent with the moving direction of the rack (25); the flow regulating plate (31) is provided with an overflowing hole; the flow adjusting plate (31) is limited in the through hole in a sliding mode, and one end of the flow adjusting plate is fixed with the rack (25); the rack (25) moves to drive the flow adjusting plate (31) to move, so that the area of the overflowing hole in the foam liquid pipe (3) is changed.
Further, a mounting seat (28) is fixed in the transmission case (21); one end of the elastic piece (27) is fixed with the mounting seat (28), and the other end of the elastic piece is fixed with the rack (25).
Further, the elastic member (27) is a spring.
Further, the rotating shaft (11) and the bracket (12) are rotationally fixed; the support (12) is a frame body shaped like a Chinese character 'tian'.
Further, the area of the impact plate (13) is smaller than 1/2 of the cross-sectional area of the mixing cavity.
Furthermore, the number of the impellers (14) and the number of the impact-resistant plates (13) are two, and the impellers (14) and the impact-resistant plates (13) are arranged in a staggered mode.
Further, the water inlet direction is vertical to the air inlet direction.
Furthermore, the two air inlets (16) are respectively arranged at the upstream of the bracket (12) and between the two impact-resistant plates (13)
The utility model has the advantages that:
1. according to the foam liquid mixing device, the impeller is driven to rotate by the power of high-pressure gas, so that the water and the foam liquid are mixed, in addition, the impeller drives the rotating shaft to rotate, the rotating shaft drives the gear to rotate, and the gear drives the rack to move linearly, so that the flow adjusting plate is driven to move, and the adjustment of the flow of the foam liquid is realized. The power of high-pressure gas is fully utilized, no additional power source is needed, the cost is saved, the flow of the foam liquid can be adjusted according to the air pressure, and the reasonable proportion of water and the foam liquid is realized. Through the inside fixed mounting at mixing drum there are two protecting against shock boards for water after the trickling can reduce its impact force, and the setting of support not only provides the support for the pivot, even the dispersed water column still goes out at the water inlet, makes rivers disorderly, improves the mixing accuracy.
2. In the utility model, the flow regulating device only consists of the gear, the rack, the chain wheel and the elastic part, has low cost and convenient assembly, maintenance and replacement, and can realize automatic regulation of the flow of the foam liquid by matching with the flow regulating plate on the foam liquid pipe. This structure is convenient for reform transform current mixing arrangement, and the transformation technique degree of difficulty is low, and is fast.
3. The water flow direction is perpendicular to the air flow direction, so that water flow can be further dispersed, a certain angle is formed between the air flow and the impeller, the impeller can be driven by air pressure to rotate, a series of linkage of the 1 st point is realized, and the kinetic energy of high-pressure gas is fully utilized.
Drawings
FIG. 1 is a schematic view showing the external structure of a mixing device for a compressed air foam fire extinguishing system according to an embodiment of the present invention;
FIG. 2 is a schematic vertical sectional view of FIG. 1;
FIG. 3 is an enlarged view of part A of FIG. 2;
fig. 4 is a schematic view of the internal structure of a foam liquid flow regulating assembly in a mixing device for a compressed air foam fire extinguishing system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the embodiment discloses a mixing device for a compressed air foam fire extinguishing system, as shown in fig. 2, comprising a mixing barrel 1, a rotating shaft 11, a bracket 12, an impact-proof plate 13, an impeller 14, and a foam concentrate flow regulating assembly 2;
the mixing barrel 1 is internally provided with a mixing cavity for mixing water and foam concentrate. In this embodiment, the mixing tub 1 is a long tub having a substantially circular cross section and is disposed horizontally. Both ends of the rotating shaft 11 are rotatably fixed at both ends of the mixing chamber through bearings.
In this embodiment, the impact-proof plate 13 is fixed on the inner wall of the mixing chamber, is a plate-shaped structure with an area smaller than the cross-sectional area 1/2 of the mixing chamber, and can be semicircular, square or irregular, and aims to provide a certain resistance to water flow and reduce the impact force of water on the mixing barrel 1.
In this embodiment, the impeller 14 is fixed to the rotating shaft 11; the impeller 14 may be of the fan-blade type or of the turbine type, and is intended to rotate under the impact of high-pressure air, so as to mix the water and the foam concentrate rapidly and uniformly. The impeller 14 and the rotating shaft 11 may be fixed by welding, bolting, or the like.
In this embodiment, the number of the impellers 14 and the number of the impact-resistant plates 13 are 2, and the impellers 14 and the impact-resistant plates 13 are arranged in a staggered manner, so that the impact force of water flow on the impellers 14 is reduced.
In this embodiment, since water enters the mixing tub 1 in a columnar shape, in order to rapidly disperse water flow, a bracket 12 is further added at the upstream of the impeller 14, and the bracket 12 and the rotating shaft 11 are rotationally fixed through a bearing, so that support can be provided for the bearing, and a water column can be dispersed by using the structure of the bracket 12. The support 12 may be a generally field-shaped support or a support in which a plurality of rods are radially arranged, as long as the shape that breaks up the water column and does not block the water flow can be realized.
In this embodiment, the mixing barrel 1 is provided with a water inlet 15 and an air inlet 16; the number of the water inlets 15 and the air inlets 16 is 2 for efficiency, and of course, the number of the water inlets 15 and the air inlets 16 may be determined according to the volume of the mixing tub 1. Two water inlets 15 are arranged at one end of the mixing barrel 1 and are respectively positioned above and below the rotating shaft 11, and the water inlet direction is vertical to the bracket 12, the impeller 14 and the impact-proof plate 13. The air inlets 16 are arranged on the top wall of the mixing barrel 1, 2 air inlets 16 are respectively arranged on the top of the mixing barrel 1 and are distributed on two sides of the foam liquid inlet 3, and the foam liquid is uniformly dispersed in the mixing barrel 1 as much as possible.
A foam liquid inlet is formed in the top wall of the mixing barrel 1, and a foam liquid inlet 3 is formed in the foam liquid inlet; a through hole is arranged on the foam liquid inlet 3; the direction of the through hole is consistent with the moving direction of the rack; the flow regulating plate 31 is provided with an overflowing hole; the flow regulating plate 31 is slidably retained in the through hole.
As shown in fig. 4, the foam liquid flow rate adjusting assembly 2 includes a transmission case 21; the transmission case 21 is fixed on the outer wall of the mixing barrel 1, a sliding sleeve plate 22 is fixed in the transmission case 21, and a rotating bracket 23 is fixed on the sliding sleeve plate 22; the gear 24 is rotationally fixed on the rotating bracket 23; the rack 25 horizontally penetrates through the sliding sleeve plate 22 to be meshed with the bottom of the gear 24; the chain 26 penetrates through the transmission case 21 and the wall of the mixing barrel 1 and is respectively sleeved on the transmission shaft of the gear 24 and the rotating shaft 11 to form a linkage structure; one end of the rack 25 penetrates through the transmission case 21 and is fixed with the flow adjusting plate 31, the other end is positioned in the transmission case 21 and is fixed with one end of the elastic element 27, and the other end of the elastic element 27 is fixed with the mounting seat 28. In this embodiment, the elastic member 27 may be a spring, an elastic band, or the like.
In this embodiment, the flow adjusting plate 31 is a rubber plate, has a certain elasticity, and can be closely matched with the foam liquid inlet 3 for the through hole without affecting pumping. The length of the flow adjusting plate 31 is larger than the diameter of the foam liquid inlet 3, and when the flow adjusting plate 31 is driven by the rack 25 to do pulling-out or inserting movement in the through hole, the flow adjusting plate 31 is not separated from the foam liquid inlet 3 all the time, so that dislocation is avoided. The flow rate is adjusted by drawing the flow rate adjusting plate 31 to change the overlapping surface of the overflowing hole and the section of the foam concentrate inlet 3.
In this embodiment, the bottom wall of the mixing barrel 1 is provided with two foam liquid outlets 17, which are generally located at the bottom of the end far away from the water inlet 15, so as to facilitate discharging the foam liquid.
In the embodiment, because the rack 25 is long, in order to ensure the stability of the rack 25, a support frame 4 is further arranged between the transmission case 21 and the foam concentrate inlet 3, and a cross rod 41 is arranged on the support frame; the rack 25 is provided with a limit long hole, and the cross rod passes through the limit long hole, so that the rack 25 cannot shake or move when moving.
The working principle of foam preparation using the mixing device of this example:
the water inlet 15 and the air inlet are opened, and the water column is rapidly dispersed under the action of the bracket 12; the impeller 14 rotates under the action of high-pressure gas, and further drives the rotating shaft 11 to rotate; the foam liquid inlet valve is opened, the rotating shaft 11 drives the gear 24 to rotate, the gear 24 drives the rack 25 to move, the rack 25 drives the flow adjusting plate 31 to move, and the overlapping surface of the overflowing hole of the flow adjusting plate 31 and the foam liquid inlet 3 is changed so as to adjust the flow of the foam liquid. Because the air inlet pressure is different, the rotating speeds of the impellers 14 are different, so that the moving speeds of the rack 25 driven by the gear 24 are different, when the air pressure is higher, the power received by the rack 25 is higher, the moving stroke is also larger, the rack 25 drives the flow adjusting plate 31 to move in the positive direction, the overflowing hole is enlarged, and at the moment, the elastic member 27 is pulled; when the air pressure is small, the rotating speed of the impeller 14 is reduced, the rotating speed of the gear 24 driven by the rotating shaft 11 is reduced, the kinetic energy obtained by the rack 25 is reduced, the elastic piece 27 resets to drive the rack 25 to move in the reverse direction, the rack 25 drives the flow adjusting plate 31 to move in the reverse direction, and the overflowing hole is reduced.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A mixing device for a compressed air foam fire extinguishing system is characterized by comprising a mixing barrel (1), a rotating shaft (11), a bracket (12), an impact-resistant plate (13), an impeller (14) and a foam liquid flow regulating component (2);
a mixing cavity is arranged in the mixing barrel (1); the rotating shaft (11) is rotationally fixed in the mixing cavity, and the impact-resistant plate (13) is fixed on the inner wall of the mixing cavity; the impeller (14) is fixed on the rotating shaft (11); the bracket (12) is fixed in the mixing cavity and is used for disturbing water flow;
the mixing barrel (1) is provided with a water inlet (15) and an air inlet (16); the bracket (12) is positioned between the water inlet (15) and the impact-resistant plate (13); the air inlet (16) is connected with a high-pressure air tank;
a foam liquid inlet is formed in the mixing barrel (1), and a foam liquid pipe (3) is installed at the foam liquid inlet; the pipe of the foam liquid pipe (3) is provided with a flow adjusting plate (31);
the foam concentrate flow regulating component (2) comprises a rack (25), a gear (24) and an elastic piece (27); the gear (24) is linked with the rotating shaft (11) through a transmission chain (26); the rack (25) is meshed with the gear (24); one end of the rack (25) is fixed with the flow adjusting plate (31), the other end of the rack is fixed with one end of the elastic piece (27), and the other end of the elastic piece (27) is fixed.
2. A mixing device for a compressed air foam fire extinguishing system according to claim 1, characterized in that the foam liquid flow regulating assembly (2) comprises a transmission case (21); the transmission case (21) is fixed on the outer wall of the mixing barrel (1), a sliding sleeve plate (22) is fixed in the transmission case (21), and a rotating support (23) is fixed on the sliding sleeve plate (22); the gear (24) is rotationally fixed on the rotating bracket (23); the rack (25) horizontally penetrates through the sliding sleeve plate (22) and is meshed with the gear (24); the chain (26) penetrates through the transmission box (21) and the wall of the mixing barrel (1) and is respectively sleeved on a transmission shaft of the gear (24) and the rotating shaft (11); one end of the rack (25) penetrates through the transmission case (21) and is fixed with the flow adjusting plate (31).
3. Mixing device according to claim 2, characterized in that the foam pipe (3) is provided with through holes; the direction of the through hole is consistent with the moving direction of the rack (25); the flow regulating plate (31) is provided with an overflowing hole; the flow adjusting plate (31) is limited in the through hole in a sliding mode, and one end of the flow adjusting plate is fixed with the rack (25); the rack (25) moves to drive the flow adjusting plate (31) to move, so that the area of the overflowing hole in the foam liquid pipe (3) is changed.
4. A mixing device for a compressed air foam fire extinguishing system according to claim 2 or 3, characterized in that a mounting seat (28) is fixed in the transmission case (21); one end of the elastic piece (27) is fixed with the mounting seat (28), and the other end of the elastic piece is fixed with the rack (25).
5. A mixing device for a compressed air foam fire extinguishing system according to claim 4, characterized in that the resilient member (27) is a spring.
6. A mixing device for a compressed air foam fire extinguishing system according to any of claims 1 to 3, characterized in that the shaft (11) is rotationally fixed to the bracket (12); the support (12) is a frame body shaped like a Chinese character 'tian'.
7. A mixing device for a compressed air foam fire extinguishing system according to any of claims 1 to 3, characterized in that the impact plate (13) has an area smaller than 1/2 of the cross-sectional area of the mixing chamber.
8. A mixing device for a compressed air foam fire extinguishing system according to any of claims 1 to 3, characterized in that the number of impellers (14) and impact protection plates (13) is two, and the impellers (14) and impact protection plates (13) are arranged in a staggered manner.
9. A mixing device for a compressed air foam fire extinguishing system according to any one of claims 1 to 3, characterized in that the water intake direction and the air intake direction are perpendicular.
10. A mixing device for a compressed air foam fire extinguishing system according to claim 8, characterized in that the two air inlets (16) open upstream of the bracket (12) and between the two impact plates (13), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121843132.2U CN216061797U (en) | 2021-08-06 | 2021-08-06 | Mixing device for compressed air foam fire extinguishing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121843132.2U CN216061797U (en) | 2021-08-06 | 2021-08-06 | Mixing device for compressed air foam fire extinguishing system |
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| Publication Number | Publication Date |
|---|---|
| CN216061797U true CN216061797U (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121843132.2U Active CN216061797U (en) | 2021-08-06 | 2021-08-06 | Mixing device for compressed air foam fire extinguishing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114849109A (en) * | 2022-04-27 | 2022-08-05 | 安徽中科安和科技有限公司 | Compressed air foam generating device |
| CN117861125A (en) * | 2024-03-12 | 2024-04-12 | 四川特威特消防科技有限公司 | High-speed rotary jetting device suitable for compressed air foam liquid |
-
2021
- 2021-08-06 CN CN202121843132.2U patent/CN216061797U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114849109A (en) * | 2022-04-27 | 2022-08-05 | 安徽中科安和科技有限公司 | Compressed air foam generating device |
| CN117861125A (en) * | 2024-03-12 | 2024-04-12 | 四川特威特消防科技有限公司 | High-speed rotary jetting device suitable for compressed air foam liquid |
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