Intelligent irrigation device for agaric planting
Through the intelligent irrigation device combined with humidity sensors and electronically controlled boosting system, the problems of inaccurate humidity control and blockage in traditional fungus planting are solved, and efficient water resource utilization and improvement of fungus quality are achieved.
Patent Information
- Application Number
- CN202510783833.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-12
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2045-06-12
AI Technical Summary
Traditional fungus planting and irrigation systems are difficult to accurately control humidity, are prone to blockage and waste water resources, cannot adapt to the bacterial rod stacking planting model, and lack intelligent regulation.
The intelligent irrigation device is adopted, combined with a humidity sensor and an electronically controlled booster mechanism to dynamically adjust the irrigation volume, and a filter chamber and a split structure are set up in the anti-blocking sprinkler to avoid clogging. The laminated filter and annular diaphragm are used to adjust the water pressure.
It realizes precise control of soil moisture, reduces water resource waste and sprinkler head blockage frequency, improves fungus growth quality and reduces operation and maintenance costs.
Smart Images

Figure CN120501010A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of wood ear cultivation, and particularly relates to an intelligent irrigation device for wood ear cultivation. Background Art
[0002] As an important edible fungus, wood ear mushrooms require high humidity control in the growing environment for large-scale cultivation. Traditional wood ear mushroom cultivation mostly uses manual irrigation or simple sprinkler systems, which have significant drawbacks: on the one hand, it is difficult to accurately control the irrigation volume through manual operation, which can easily lead to excessive moisture or insufficient moisture in the mushroom stick area, affecting the quality of the wood ear mushrooms; on the other hand, the traditional sprinkler head has a simple structure and is prone to clogging due to the deposition of impurities in the water after long-term use, requiring high maintenance frequency and affecting irrigation uniformity. Existing irrigation systems mostly rely on fixed pipe layouts, which are difficult to adapt to the stacked mushroom stick cultivation model and are prone to irrigation blind spots. In addition, most systems lack intelligent control methods and are unable to dynamically adjust the water supply according to soil moisture, resulting in a waste of water resources. Although some technologies have attempted to introduce filtration devices, conventional filter structures are easily clogged by algae or particulate matter, which increases the system operating load.
[0003] Therefore, there is an urgent need to develop an irrigation device with both intelligent regulation and optimized anti-blocking performance to meet the precise management needs of modern large-scale cultivation of wood ear mushrooms. Summary of the Invention
[0004] To address the above-mentioned problems in the prior art, the present invention discloses an intelligent irrigation device for growing wood ear mushrooms. The device can automatically adjust the irrigation volume according to the soil moisture and prevent nozzle blockage by providing a filter cavity within the anti-blocking nozzle. The present invention specifically discloses the following technical solutions:
[0005] An intelligent irrigation device for growing wood ear mushrooms, comprising a water reservoir, an electrically controlled pressurizing mechanism, a water distribution pipeline, an anti-blocking nozzle, and a humidity sensor. The water distribution pipeline is connected to the water reservoir through the electrically controlled pressurizing mechanism. The anti-blocking nozzle is arranged in the middle aisle of the mushroom stick stacking area through an insertion rod. The anti-blocking nozzle is connected to the water distribution pipeline. The anti-blocking nozzle is a split structure. A filter cavity for collecting impurities is provided in the anti-blocking nozzle. The humidity sensor is distributed in the soil where the mushroom sticks are stacked. The humidity sensor is connected to the circuit of the electrically controlled pressurizing mechanism. The water reservoir pipeline is connected to a filter mechanism, and the filter mechanism is a laminated filter.
[0006] Furthermore, the electrically controlled boosting mechanism includes an electrically controlled valve, a boosting pump and a control box. The water distribution pipeline is connected to the water reservoir through the electrically controlled valve. The boosting pump is arranged at the water inlet end of the water distribution pipeline. The control box is arranged on one side of the water reservoir. The electrically controlled valve and the boosting pump are both electrically connected to the control box.
[0007] Furthermore, it also includes a solar panel and a light sensor, the light sensor is arranged in the middle of the solar panel, and the light sensor and humidity sensor are electrically connected to the solar panel and the control box.
[0008] Furthermore, the water distribution pipeline includes a main pipeline and several branch pipelines. The main pipeline is arranged on one side of the field, and the several branch pipelines are respectively arranged on the middle aisles of the mushroom stick stacking area, and the branch pipelines are connected to the main pipeline.
[0009] Furthermore, a sealing cover is provided at the end of the branch pipe, and the sealing cover is threadedly connected to the branch pipe.
[0010] Furthermore, the anti-blocking nozzle also includes an upper shell, a lower shell, an anti-blocking atomizing cap and a connecting rod, the lower shell is arranged on the insertion rod, the upper shell is threadedly connected to the lower shell, the top of the upper shell is provided with a stepped groove, the anti-blocking atomizing cap is slidably arranged in the stepped groove, the inner wall of the lower shell is provided with a plurality of guide protrusions, the guide protrusion is provided with a connecting groove at one end facing the upper shell, the periphery of the filter cavity is provided with a hollow guide groove corresponding to the guide protrusion, the filter cavity is slidably arranged in the guide protrusion, the middle part of the anti-blocking atomizing cap is rotatably provided with a connecting rod, and the downward end of the filter cavity is provided with a conical baffle, and the conical baffle passes through the filter cavity and is threadedly connected to the connecting rod.
[0011] Furthermore, the anti-blocking atomization cap includes a baffle cap and an atomization core column, the atomization core column is arranged at the bottom of the baffle cap, a water outlet is provided on the side of the atomization core column, an umbrella-shaped groove is provided at the bottom of the atomization core column, and an inclined water inlet is provided at the edge of the umbrella-shaped groove, and the rotation of the connecting rod is limited to the center of the bottom end of the atomization core column.
[0012] Furthermore, it also includes a spring, which is wrapped around the surface of the atomizer core column. A receiving groove is provided inside the upper shell corresponding to the spring. One end of the spring is connected to the upper shell, and the other end of the spring is connected to the atomizer core column.
[0013] Furthermore, the filter cavity includes a cavity frame and a filter screen, the filter screen is arranged on the cavity frame, the bottom edge of the cavity frame is provided with an annular groove, the conical baffle is clamped in the annular groove, the back of the conical baffle is provided with a cylindrical rod, the top of the cylindrical rod is provided with an external thread, and a connecting baffle is provided above the cavity frame, and the cylindrical rod is threaded through the connecting baffle and connected to the connecting rod.
[0014] Furthermore, it also includes an annular diaphragm, which is arranged on the top edge of the cavity frame and below the water inlet of the anti-blocking nozzle.
[0015] The beneficial effects of the present invention are:
[0016] 1. This invention uses distributed humidity sensors to monitor soil humidity in real time, and combines an electronically controlled booster pump with an electronically controlled valve to dynamically adjust the irrigation volume, avoiding the blindness of traditional manual irrigation. This ensures uniform and stable humidity on the mushroom sticks, reduces water waste, and improves the quality of wood ear mushroom growth.
[0017] 2. The present invention adopts a split anti-clogging nozzle design. The internal filter cavity can efficiently intercept impurities in the water, and realize centralized collection of impurities through the conical baffle and detachable filter structure. The nozzle has built-in hollow guide grooves, conical baffles and spring structures, which automatically rebound when the water supply is cut off to prevent particulate impurities from returning to the pipeline. Combined with the laminated filter, the frequency of nozzle blockage is greatly reduced, and the intensity of manual cleaning is reduced. The shell, filter cavity and pipeline are all detachable. The filter, conical baffle and other wearing parts can be replaced separately, which can not only facilitate the cleaning of impurities in the filter cavity, but also extend the overall life of the device and reduce operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the pipeline connection of the present invention;
[0019] Figure 2 This is a cross-sectional view of the anti-blocking nozzle housing of the present invention;
[0020] Figure 3 This is a schematic diagram of the anti-blocking atomizing cap water inlet arrangement of the present invention;
[0021] Figure 4 This is a schematic diagram of the assembly of the upper shell, lower shell and anti-blocking atomizing cap of the present invention;
[0022] Figure 5 This is a schematic diagram of the assembly of the anti-blocking atomization cap and the cavity frame of the present invention;
[0023] Figure 6 This is a schematic diagram of the top of the cavity frame and the internal filter arrangement of the present invention;
[0024] Figure 7 Schematic diagram of the annular diaphragm structure of the present invention;
[0025] Figure 8 Schematic diagram of the deformation state of the annular diaphragm under high water pressure or when no impurities are accumulated in the filter chamber;
[0026] Figure 9 This is a schematic diagram of the deformation state of the annular diaphragm after low water pressure or accumulation of impurities in the filter chamber of the present invention.
[0027] Among them, 1-water reservoir; 2-anti-blocking nozzle; 3-humidity sensor; 4-bacteria stick; 5-laminated filter; 6-electrically controlled valve; 7-boosting pump; 8-control box; 9-solar panel; 10-light sensor; 11-main pipeline; 12-branch pipeline; 13-sealing cover; 201-upper shell; 202-lower shell; 203-connecting rod; 204-guide protrusion; 205-hollow guide groove; 206-conical baffle; 207-blocking cap; 208-atomizing core column; 209-water outlet; 210-water inlet; 211-spring; 212-cavity frame; 213-filter screen; 214-columnar rod; 215-cylindrical filter chamber; 216-connecting baffle; 217-annular diaphragm; 218-first rubber ring protrusion; 219-second rubber ring protrusion. DETAILED DESCRIPTION
[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0029] Example 1
[0030] Refer to the attached Figure 1-7 The present embodiment discloses an intelligent irrigation device for growing wood ear mushrooms, comprising a water reservoir 1, an electrically controlled pressurizing mechanism, a water distribution pipeline, an anti-blocking nozzle 2 and a humidity sensor 3. The water distribution pipeline is connected to the water reservoir 1 through the electrically controlled pressurizing mechanism. A plug rod is provided at the bottom of the anti-blocking nozzle 2. The anti-blocking nozzle 2 is inserted into the soil in the middle of the interval area where the mushroom sticks are stacked through the plug rod. The anti-blocking nozzle 2 is connected to the water distribution pipeline. In order to facilitate the cleaning of impurities in the water, the anti-blocking nozzle 2 is a split structure. A filter cavity for collecting impurities is provided in the anti-blocking nozzle 2. The humidity sensor 3 is distributed in the soil where the mushroom sticks 4 are stacked. The mushroom sticks 4 are half buried in the soil. The humidity sensor 3 is connected to the circuit of the electrically controlled pressurizing mechanism. The water reservoir 1 pipeline is connected to a laminated filter 5.
[0031] Specifically, the water distribution pipeline includes a main pipeline 11 and several branch pipelines 12. The main pipeline 11 is arranged on one side of the field, and the several branch pipelines 12 are respectively arranged on the middle partition of the mushroom stick stacking area. The branch pipeline 12 is connected to the main pipeline 11. A sealing cover 13 is installed at the end of the branch pipeline 12. The sealing cover 13 is threadedly connected to the branch pipeline 12. The sealing cover 13 is used for cleaning the pipeline. When the pipeline needs to be cleaned, the sealing cover 13 can be opened and the impurities in the pipeline can be flushed out of the pipeline by water flow.
[0032] The electrically controlled boosting mechanism includes an electrically controlled valve 6, a boosting pump 7 and a control box 8. The main pipeline 11 is connected to the water reservoir 1 through the electrically controlled valve 6. The boosting pump 7 is arranged at the water inlet end of the main pipeline 11. The control box 8 is installed on one side of the water reservoir 1. The electrically controlled valve 6 and the boosting pump 7 are both electrically connected to the control box 8.
[0033] As a preferred embodiment of the present invention, it also includes a solar panel 9 and a light sensor 10. The light sensor 10 is arranged in the middle of the solar panel 9. The light sensor 10 and the humidity sensor 3 are electrically connected to the solar panel 9 and the control box 8. The solar panel 9 is used to power the light sensor 10 and the humidity sensor 3 in real time, saving electricity resources.
[0034] The present invention can monitor the humidity of the soil in real time through the setting of the humidity sensor 3, and transmit the signal to the control box 8 to accurately control the irrigation amount. At the same time, the light sensor 10 monitors the light intensity to control the spraying time, avoid irrigating the wood ear in the time period with the strongest light intensity, and can adjust the irrigation amount and irrigation time according to the light intensity to meet the humidity control of the wood ear growth environment and improve the quality of the wood ear.
[0035] As a preferred embodiment of the present invention, the anti-blocking nozzle 2 also includes an upper shell 201, a lower shell 202, an anti-blocking atomizing cap and a connecting rod 203. The lower shell 202 is fixed on the insertion rod, and the upper shell 201 is threadedly connected to the lower shell 202. A stepped groove is provided on the top of the upper shell 201, and the anti-blocking atomizing cap is slidably installed in the top stepped groove of the upper shell 201. A plurality of guide protrusions 204 are installed around the inner wall of the lower shell 202. The guide protrusion 204 is provided with a connecting groove toward one end of the upper shell 201 for the passage of water. A hollow guide groove 205 is provided on the periphery of the filter cavity corresponding to the guide protrusion 204. The filter cavity is slidably installed in the guide protrusion 204. A rotatable connecting rod 203 is installed in the middle of the bottom end of the anti-blocking atomizing cap, and a conical baffle 206 is installed at the downward end of the filter cavity. The conical baffle 206 passes through the filter cavity and is threadedly connected to the connecting rod 203.
[0036] The anti-blocking atomization cap in this embodiment includes a blocking cap 207 and an atomization core column 208. The atomization core column 208 is fixed to the bottom of the blocking cap 207. A water outlet 209 is provided on the top side of the atomization core column 208. An umbrella-shaped groove is cut at the bottom of the atomization core column 208. An inclined water inlet 210 is provided at the edge of the umbrella-shaped groove. The rotation of the connecting rod 203 is limited to the bottom center of the atomization core column 208.
[0037] When the fungus is not being sprayed and irrigated, the conical baffle 206 can block the water inlet of the lower shell 202. When the water reaches the anti-blocking nozzle 2, it will impact the conical baffle 206, pushing the conical baffle 206 upward, driving the anti-blocking atomizing cap upward, and the water outlet 209 leaks out from the nozzle. At this time, the water will enter the filter chamber through the connecting groove of the guide protrusion 204. After the impurities in the water enter the filter chamber, they will remain in the filter chamber due to the presence of the filter screen. The filtered water will then pass through the water inlet 210 of the atomizing core column 208 to reach the water outlet 209, spraying the fungus. After the irrigation is completed and the water flow is turned off, the anti-blocking atomizing cap slides down due to its own weight and returns to the shell, preventing the water outlet 209 from being exposed and blocked by dust. Due to the presence of the conical baffle 206, the impurities in the filter chamber will remain in the filter chamber to collect the impurities and prevent them from flowing back to the branch pipe 12 with the water.
[0038] As a preferred embodiment of the present invention, the present invention also includes a spring 211. A receiving groove is cut into the interior of the upper shell 201 corresponding to the spring 211. The spring 211 is located in the receiving groove and surrounds the surface of the atomizer core 208. One end of the spring 211 is connected to the upper shell 201, and the other end of the spring 211 is connected to the atomizer core 208. When irrigation is required, the water pressure pushes the conical baffle 206, which in turn drives the atomizer core 208 to move upward, causing the spring 211 to be in a compressed state. After irrigation is completed, the spring 211 will push the atomizer core 208 to quickly reset to prevent the structure from getting stuck. At the same time, the vibration generated by the spring 211 when it rebounds can also shake impurities attached to the filter screen at the top of the filter chamber off into the conical baffle 206, realizing automatic cleaning of the filter screen.
[0039] As a preferred embodiment of the present invention, the filter chamber includes a chamber frame 212 and a filter screen 213. The filter screen 213 is arranged on the chamber frame 212. The bottom edge of the chamber frame 212 is provided with an annular groove, and a conical baffle 206 is inserted into the annular groove. The back of the conical baffle 206 is provided with a cylindrical rod 214. The top of the cylindrical rod 214 is provided with an external thread. The middle portion of the top of the chamber frame 212 is bent into the filter chamber to form a cylindrical filter chamber 215. The bottom end of the cylindrical filter chamber 215 is fixed with a connecting baffle 216 with a limiting hole. The cylindrical rod 214 passes through the limiting hole and is threadedly connected to the connecting rod 203. The provision of the cylindrical filter chamber 215 increases the surface area of the water flow to be filtered and improves the water flow rate. When particulate impurities in the water gradually accumulate on the top of the frame due to the impact of the water flow, causing the water flow rate to decrease, the water can flow from the filter screen 213 of the cylindrical filter chamber 215 to the water inlet 210.
[0040] As a preferred embodiment of the present invention, in order to maintain the stability of the water pressure of the nozzle and make the water output more uniform, an annular diaphragm 217 is also included. The annular diaphragm 217 in this embodiment is a rubber diaphragm that can be deformed under pressure. During extrusion molding, a first rubber ring protrusion 218 is formed on the outer ring, and a second rubber ring protrusion 219 is formed at the edge. The top of the cavity frame 212 and the bottom end of the atomizing core column 208 are respectively provided with annular limiting grooves corresponding to the first rubber ring protrusion 218. The annular diaphragm 217 is installed between the cavity frame 212 and the atomizing core column 208 through the first rubber ring protrusion 218, and is located at the water inlet 210 of the anti-blocking nozzle 2. The outer edge of the annular diaphragm 217 is provided with a second rubber ring protrusion 219, which can play a certain sealing role to prevent water from flowing from the gap between the shell and the atomizing core column 208 to the outside of the nozzle. The inside of the annular diaphragm 217 plays a role in regulating the water pressure. Figure 8 As shown, when the water pressure is too high or there is no accumulation of impurities in the filter chamber, the water flow will impact the annular diaphragm 217 and deform it, moving closer to the water inlet 210, reducing the water inlet area of the water inlet 210, and thus regulating and reducing the water inlet volume, as shown in FIG. Figure 9 As shown, when the water pressure decreases or the water flow impacting the annular diaphragm 217 decreases due to the accumulation of impurities at the top of the filter chamber, the deformation of the annular diaphragm 217 decreases, and the blocking area of the water inlet 210 decreases. At the same time, most of the water flows from the filter screen of the cylindrical filter chamber 215 to the atomizing core column 208, and enters the water inlet 210 through the umbrella-shaped groove, keeping the water pressure relatively constant.
[0041] When the anti-clogging nozzle 2 in the present invention needs to be cleaned, it can be removed from the lower shell 202 by screwing the upper shell 201, and then the connecting rod 203 can be clamped through the hollow guide groove 205 of the filter cavity by using needle-nosed pliers (fixed to prevent it from rotating), and the conical baffle 206 can be rotated to remove the conical baffle 206 from the filter cavity, and the cavity frame 212 can be pulled to remove it from the connecting rod 203, so as to facilitate the cleaning of the filter screen 213 and the replacement of the annular diaphragm 217, so as to extend the overall life of the device.
[0042] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. An intelligent irrigation device for growing fungus, characterized in that: The invention comprises a water reservoir (1), an electric-controlled pressure-increasing mechanism, a water distribution pipeline, an anti-blocking nozzle (2) and a humidity sensor (3); the water distribution pipeline is connected to the water reservoir (1) via the electric-controlled pressure-increasing mechanism; the anti-blocking nozzle (2) is arranged in the middle aisle of the mushroom stick stacking area via a rod; the anti-blocking nozzle (2) is connected to the water distribution pipeline; the anti-blocking nozzle (2) is a split structure; a filter cavity for collecting impurities is provided in the anti-blocking nozzle (2); the humidity sensor (3) is distributed in the soil where the mushroom sticks (4) are stacked; the humidity sensor (3) is connected to the electric-controlled pressure-increasing mechanism circuit; the water reservoir (1) pipeline is connected to a filter mechanism; the filter mechanism is a laminated filter (5).
2. The intelligent irrigation device for growing fungus according to claim 1, characterized in that: The electrically controlled boosting mechanism comprises an electrically controlled valve (6), a boosting pump (7) and a control box (8); the water distribution pipeline is connected to the water reservoir (1) via the electrically controlled valve (6); the boosting pump (7) is arranged at the water inlet end of the water distribution pipeline; the control box (8) is arranged on one side of the water reservoir (1); and the electrically controlled valve (6) and the boosting pump (7) are both electrically connected to the control box (8).
3. The intelligent irrigation device for growing fungus according to claim 2, characterized in that: It also includes a solar panel (9) and a light sensor (10), wherein the light sensor (10) is arranged in the middle of the solar panel (9), and the light sensor (10) and the humidity sensor (3) are electrically connected to the solar panel (9) and the control box (8).
4. The intelligent irrigation device for growing wood ear mushrooms according to claim 1, characterized in that: The water distribution pipeline comprises a main pipeline (11) and a plurality of branch pipelines (12). The main pipeline (11) is arranged on one side of the field, and the plurality of branch pipelines (12) are respectively arranged on the middle aisles of the mushroom stick stacking area, and the branch pipelines (12) are connected to the main pipeline (11).
5. The intelligent irrigation device for growing fungus according to claim 4, characterized in that: A sealing cover (13) is provided at the end of the branch pipe (12), and the sealing cover (13) is threadedly connected to the branch pipe (12).
6. The intelligent irrigation device for growing fungus according to claim 1, characterized in that: The anti-blocking nozzle (2) further comprises an upper shell (201), a lower shell (202), an anti-blocking atomizing cap and a connecting rod (203); the lower shell (202) is arranged on the insertion rod; the upper shell (201) is threadedly connected to the lower shell (202); a stepped groove is provided on the top of the upper shell (201); the anti-blocking atomizing cap is slidably provided in the stepped groove; the inner wall of the lower shell (202) is provided with a plurality of guide protrusions (204); the guide protrusions A connecting groove is provided at one end of the protrusion (204) facing the upper shell (201), a hollow guide groove (205) is provided on the periphery of the filter chamber corresponding to the guide protrusion (204), the filter chamber is slidably arranged in the guide protrusion (204), a connecting rod (203) is rotatably provided in the middle of the anti-blocking atomization cap, and a conical blocking piece (206) is provided at the downward end of the filter chamber, and the conical blocking piece (206) passes through the filter chamber and is threadedly connected to the connecting rod (203).
7. The intelligent irrigation device for growing fungus according to claim 6, characterized in that: The anti-blocking atomizing cap comprises a blocking cap (207) and an atomizing core column (208); the atomizing core column (208) is arranged at the bottom of the blocking cap (207); a water outlet (209) is arranged on the side of the atomizing core column (208); an umbrella-shaped groove is arranged at the bottom of the atomizing core column (208); an inclined water inlet (210) is arranged at the edge of the umbrella-shaped groove; and the connecting rod (203) is rotationally limited to the center of the bottom end of the atomizing core column (208).
8. The intelligent irrigation device for growing wood ear mushrooms according to claim 7, characterized in that: The invention also includes a spring (211), wherein the spring (211) surrounds the surface of the atomizing core column (208), and a receiving groove is provided inside the upper shell (201) corresponding to the spring (211), one end of the spring (211) is connected to the upper shell (201), and the other end of the spring (211) is connected to the atomizing core column (208).
9. The intelligent irrigation device for growing wood ear mushrooms according to claim 7, characterized in that: The filter cavity comprises a cavity frame (212) and a filter screen (213), wherein the filter screen (213) is arranged on the cavity frame (212), an annular groove is provided on the bottom edge of the cavity frame (212), the conical baffle (206) is clamped in the annular groove, a columnar rod (214) is provided on the back of the conical baffle (206), an external thread is provided on the top of the columnar rod (214), a connecting baffle (216) is provided above the cavity frame (212), and the columnar rod (214) passes through the connecting baffle (216) and is threadedly connected to the connecting rod (203).
10. The intelligent irrigation device for growing wood ear mushrooms according to claim 9, characterized in that: It also includes an annular diaphragm (217), which is arranged at the top edge of the cavity frame (212) and located below the water inlet (210) of the anti-blocking nozzle (2).
Citation Information
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