Suction nozzle device and road sweeper

Abstract

This application discloses a suction nozzle device and a road sweeper. The suction nozzle device includes a lower chamber, an upper chamber, and a suction pipe. The lower chamber has a lower air chamber, and a lower air inlet and a lower air outlet communicating with the lower air chamber. The lower air inlet connects to the outside and the lower air chamber. The upper chamber is located above the lower chamber and has an upper air chamber, and an upper air inlet, a guide port, and an upper air outlet communicating with the upper air chamber. The upper air inlet connects to the outside and the upper air chamber, and the guide port connects to the upper and lower air chambers. The upper chamber is adapted to accelerate the air in the upper air chamber to draw it into the lower air chamber through the guide port. The suction pipe connects the upper and lower air outlets. By setting the upper chamber above the lower chamber, an accelerated airflow is formed in the upper air chamber, which then draws air into the lower air chamber, increasing the airflow speed in the lower air chamber. This greatly lifts and carries garbage on the road surface, shortens the time it takes for garbage to enter the suction pipe and be sucked into the garbage bin, and significantly improves the sweeper's cleaning capacity and operating speed.

Description

Technical Field

[0001] This application relates to the field of sanitation equipment technology, and in particular to a suction nozzle device and a road sweeper. Background Technology

[0002] The suction nozzle of a road sweeper is mainly used to collect road debris. After the sweeper's brushes gather the road debris together, the negative pressure suction of the nozzle draws it into the sweeper's debris bin, thus completing the road debris collection.

[0003] When the road surface is covered with a thick layer of debris or the operating speed is high, existing suction nozzles may not be able to completely suck up the debris due to insufficient suction capacity, resulting in debris residue on the road surface and poor cleaning effectiveness. At the same time, the low operating speed of the sweeper affects traffic and can easily cause traffic congestion. Summary of the Invention

[0004] This application aims to at least partially solve the technical problems in related technologies. To this end, this application proposes a suction nozzle device.

[0005] To achieve the above objectives, this application discloses a suction nozzle device, the suction nozzle device comprising:

[0006] The lower chamber is provided with a lower air cavity, and a lower air inlet and a lower air outlet communicating with the lower air cavity. The lower air inlet is connected to the outside and the lower air cavity.

[0007] An upper chamber, located above the lower chamber, includes an upper air chamber, and an upper air inlet, an air outlet, and an upper exhaust outlet communicating with the upper air chamber. The upper air inlet connects to the outside environment and the upper air chamber, and the air outlet connects the upper air chamber and the lower air chamber. The upper chamber is adapted to accelerate the air in the upper air chamber to draw air into the lower air chamber through the air outlet.

[0008] The straw connects the upper exhaust port and the lower exhaust port.

[0009] In some embodiments of this application, the direction from the rear end of the suction device to the front end of the suction device is the direction of travel of the suction device. Between the front end and the rear end of the suction device, the upper chamber is provided with an expansion section and a contraction section, and the air in the upper air chamber is adapted to be accelerated in the contraction section.

[0010] In some embodiments of this application, the expansion segment and the contraction segment each include multiple segments, and the expansion segment and the contraction segment are arranged alternately, with the drainage port located in the expansion segment and / or the contraction segment.

[0011] In some embodiments of this application, the cross-sectional area of ​​the front contraction segment (2200) in the vertical direction is greater than that of the rear contraction segment (2200) in the vertical direction along the front-to-back direction.

[0012] In some embodiments of this application, the drainage port is rectangular and extends on both sides in the front-back direction;

[0013] The contraction segment includes a straight segment, which has two relatively parallel planes, and the distance between the two planes is h, satisfying h n =λ n-1 w, where n is the number of stages of the contraction segment, h n The distance between the two planes of the nth level contraction section (2200) is λ, the first level is located at the front end of the suction device, and the nth level is located at the rear end of the suction device. λ = 0.5 to 0.8 is the airflow acceleration factor, and w is the width of the drainage port in the front-to-back direction.

[0014] In some embodiments of this application, the suction nozzle device further includes a drainage tube disposed in the upper chamber to communicate with the drainage port, and the drainage tube extends downward into the lower air chamber.

[0015] In some embodiments of this application, the distance from the lower end of the drainage tube to the working surface is h. t , satisfying h t =ζH, where ζ = 0.65~0.8 is the drainage tube height proportionality factor, and H is the distance from the top of the upper chamber to the working surface.

[0016] In some embodiments of this application, the direction from the rear end of the suction device to the front end of the suction device is the travel direction of the suction device;

[0017] The suction nozzle device also includes an air inlet pipe, which is located at the front end of the upper chamber. The rear end of the air inlet pipe is connected to the upper air inlet, and the front end of the air inlet pipe is located in front of the lower air inlet. The air inlet pipe extends forward and downward at an angle.

[0018] In some embodiments of this application, the angle formed between the extension direction of the air intake pipe and the vertical direction is θ, and θ = 55° to 65°;

[0019] The distance from the end of the intake pipe to the working surface is h0, which satisfies h0=ξH, where ξ=0.6~0.7, which is the intake pipe height proportionality factor.

[0020] This application also discloses a road sweeper, which includes the above-described suction nozzle device.

[0021] The technical solution of this application, by setting up a lower chamber, creates negative pressure in the lower air chamber when the suction nozzle device is working, allowing garbage to be sucked into the lower air chamber through the lower air inlet. By setting an upper chamber above the lower chamber and connecting the upper and lower air chambers, an accelerated airflow is formed in the upper air chamber when the suction nozzle device is working, thus creating a negative pressure zone, which in turn sucks into the lower air chamber, enhancing the airflow speed in the lower air chamber. This greatly lifts and carries garbage on the road surface, thus shortening the time it takes for garbage to enter the suction pipe and be sucked into the garbage bin, significantly improving the sweeper's cleaning capacity and operating speed.

[0022] Other advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the suction nozzle device in some embodiments;

[0025] Figure 2 This is a schematic diagram of the suction nozzle device in some embodiments;

[0026] Figure 3 for Figure 2 Enlarged view shown by the dashed line in the middle;

[0027] Figure 4 This is a cross-sectional view of the suction nozzle device in some embodiments;

[0028] Figure 5 This is a schematic diagram of the airflow of the suction nozzle device in some embodiments;

[0029] Figure 6 This is a schematic diagram of the airflow of the suction nozzle device in some embodiments;

[0030] Figure 7 This is a cross-sectional view of the suction nozzle device in some embodiments.

[0031] Explanation of icon numbers:

[0032] Lower chamber 1000, lower air chamber 1100, lower air inlet 1200, lower exhaust outlet 1300, rubber plate 1400;

[0033] Upper chamber 2000, upper air chamber 2001, upper air inlet 2002, drainage port 2003, upper exhaust port 2004;

[0034] Extension section 2100, transition section 2110;

[0035] Contraction section 2200, straight section 2210, transition section 2220;

[0036] Drainage tube 2300;

[0037] 2400 intake manifold;

[0038] 3000 straws.

[0039] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0041] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0042] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0044] A road sweeper is a type of vehicle used for road cleaning and maintenance. It has multiple functions, including road washing, sweeping, road suction, and dust suppression. Road suction involves using a suction nozzle to extract debris from the road surface. Generally, the suction nozzle has a rubber plate that forms a suction chamber. The nozzle is connected to a suction device (fan). When the suction device is working, a negative pressure is created in the suction chamber, forming an opening at the front. Debris is then drawn from the front into the suction chamber and transported to a garbage bin.

[0045] When the road surface is covered with a thick layer of debris, the suction nozzle may not be able to completely suck up the debris due to insufficient suction capacity. Similarly, even when the sweeper is traveling at a high speed, it may still fail to completely remove the debris, resulting in debris residue on the road surface and poor cleaning efficiency. While reducing the sweeper's speed can address thick layers of debris, this can cause traffic congestion. Therefore, this application proposes a suction nozzle device with strong suction power, reducing debris leakage and effectively improving operational efficiency.

[0046] It is understood that the suction nozzle device disclosed in this application can be applied not only to road sweepers, but also to other dust collection devices. The suction nozzle device will be described below using a road sweeper as an example.

[0047] Combination Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments of this application, the suction device includes a lower chamber 1000, an upper chamber 2000, and a suction tube 3000.

[0048] The lower chamber 1000 is provided with a lower air chamber 1100, and a lower air inlet 1200 and a lower air outlet 1300 connected to the lower air chamber 1100. The lower air inlet 1200 is connected to the outside and the lower air chamber 1100. The upper chamber 2000 is located above the lower chamber 1000 and is provided with an upper air chamber 2001, and an upper air inlet 2002, a drainage port 2003 and an upper air outlet 2004 connected to the upper air chamber 2001. The upper air inlet 2002 is connected to the outside and the upper air chamber 2001. The drainage port 2003 is connected to the upper air chamber 2001 and the lower air chamber 1100. The upper chamber 2000 is adapted to accelerate the air in the upper air chamber 2001 to draw the air into the lower air chamber 1100 through the drainage port 2003. The suction pipe 3000 is connected to the upper air outlet 2004 and the lower air outlet 1300.

[0049] By setting up the lower chamber 1000, when the suction device is working, the lower air chamber 1100 will form a negative pressure. The garbage enters the lower air chamber 1100 through the lower air inlet 1200. Since the upper chamber 2000 is set above the lower chamber 1000, and the upper air chamber 2001 of the upper chamber 2000 is connected to the lower air chamber 1100 of the lower chamber 1000, when the suction device is working, an accelerated airflow is formed in the upper air chamber 2001, thereby forming a negative pressure zone, which in turn sucks the lower air chamber 1100, increasing the airflow speed in the lower air chamber 1100. Some of the airflow in the lower air chamber 1100 moves upward at high speed, which has a great lifting and carrying effect on the garbage on the road. This shortens the time for garbage to enter the suction pipe 3000 and be sucked into the garbage bin, greatly improving the sweeper's cleaning ability and operating speed.

[0050] Specifically, the suction nozzle is installed on the road sweeper and can move with the road sweeper. The road sweeper is equipped with a suction device (fan), which is connected to the suction nozzle. When it is necessary to suck up the garbage on the road surface, the suction nozzle is controlled to move towards the road surface and get closer to the road surface, so that the garbage on the road surface can be sucked up through the suction nozzle.

[0051] For example, when the suction nozzle moves towards the road surface, the lower chamber 1000 is close to the road surface, and the lower air chamber 1100 is relatively closed (not completely closed). The suction device draws in air, creating a negative pressure in the lower air chamber 1100. Garbage is then drawn into the lower air chamber 1100 through the lower air inlet 1200, following the airflow. It is understandable that the suction nozzle needs to move forward with the sweeper; therefore, the lower air inlet 1200 can be positioned at the front end of the lower chamber 1000, closer to the front of the sweeper. This makes it easier for garbage to be drawn into the lower air chamber 1100 from front to back during the sweeper's movement.

[0052] The front end of the lower chamber 1000 is generally a fixed rubber plate 1400. The downward extension of the lower end of the rubber plate 1400 is less than the downward extension of the other peripheral parts of the lower chamber 1000, thus forming the lower air inlet 1200. The rubber plate 1400 can extend at an angle from top to bottom and from front to back. As the suction nozzle moves with the sweeper, outside air and debris will move towards the lower air inlet 1200 under the guidance of the rubber plate 1400, effectively improving the suction effect.

[0053] In order to form a certain suction coverage area and fully suction road garbage, the lower exhaust port 1300 is set at the rear end of the lower chamber 1000, that is, the end near the rear of the sweeper. The suction pipe 3000 is connected to the rear end of the lower chamber 1000 and thus communicates with the lower exhaust port 1300. The garbage sucked into the lower air chamber 1100 can enter the suction pipe 3000 through the lower exhaust port 1300 and then be sucked into the garbage bin.

[0054] As mentioned earlier, if the thickness of the waste is relatively large, not all of it will enter the suction pipe 3000 through the lower exhaust port 1300, resulting in leakage. In this embodiment, an upper chamber 2000 is provided above the lower chamber 1000. The upper air chamber 2001 is connected to the lower air chamber 1100 through the drainage port 2003. Since the upper chamber 2000 is configured to accelerate air, that is, the upper chamber 2000 is provided with a corresponding structure for accelerating airflow, the air can accelerate in the upper air chamber 2001. According to Bernoulli's principle, when the air accelerates in the upper air chamber 2001, a negative pressure zone is formed. Thus, the lower air chamber 1100 can be sucked through the drainage port 2003, and some of the air and waste in the lower air chamber 1100 can enter the upper air chamber 2001 through the drainage port 2003. Understandably, in order to allow some of the air and debris in the lower air chamber 1100 to be smoothly drawn into the upper air chamber 2001, the inlet 2003 should be located as close as possible to the negative pressure zone, or even located in the negative pressure zone itself.

[0055] Without the upper chamber 2000, the air in the lower air chamber 1100 of the lower chamber 1000 flows from front to back to the suction pipe 3000. However, by setting up the upper chamber 2000, the lower air chamber 1100 is suctioned. The airflow speed is faster closer to the inlet 2003 in the lower air chamber 1100, thus accelerating the flow of this air. Furthermore, the trajectory of this air is no longer from front to back, but from bottom to top, which greatly lifts and carries the garbage in the lower air chamber 1100, strengthening the disturbance of the garbage and allowing some of it to enter the upper air chamber 2001 from bottom to top. In particular, for some thick layers of garbage, suction from the lower air chamber 1100 can separate the garbage into layers, quickly breaking the adhesion between the garbage and the road surface, allowing the garbage to quickly detach from the road surface, thus enhancing the garbage collection capacity.

[0056] Under the suction effect of the upper air chamber 2001 on the lower air chamber 1100, some garbage is quickly drawn into the upper air chamber 2001 through the inlet 2003. Because the air in the upper air chamber 2001 forms an accelerated airflow, the garbage drawn into the upper air chamber 2001 is quickly transported to the suction pipe 3000 and then sucked into the garbage bin. When some garbage enters the upper air chamber 2001, the remaining garbage is drawn into the suction pipe 3000 by the airflow created by the negative pressure in the lower air chamber 1100. Since the garbage has been greatly disturbed by the suction effect of the upper air chamber 2001, it becomes easier for the lower air chamber 1100 to suck up the garbage. It is through this upward lifting and carrying action that the time it takes for road garbage to move from a static state to entering the suction pipe 3000 is significantly shortened, thereby improving the sweeper's cleaning speed and cleaning effect.

[0057] As can be seen from the above, an accelerated airflow needs to be formed in the upper air chamber 2001 to achieve suction of the lower air chamber 1100. In order to facilitate the formation of an accelerated airflow in the upper air chamber 2001, in addition to setting a corresponding structure for accelerating airflow in the upper chamber 2000, it is also necessary to provide an air supply to the upper air chamber 2001. Since the lower chamber 1000 is closer to the road surface, the lower chamber 1000 must be equipped with a lower air inlet 1200 to allow external garbage to pass through and to suction the garbage. If the air in the upper air chamber 2001 is only supplied by the lower air chamber 1100, then when the suction device just starts to operate, before the upper air chamber 2001 has had time to form an accelerated airflow, the air in the lower air chamber 1100 needs to turn to enter the upper air chamber 2001, which results in greater resistance and is not easy to achieve. Therefore, by providing an upper air inlet 2002 in the upper chamber 2000, which directly connects to the outside and the upper air chamber 2001, outside air can directly enter the upper air chamber 2001 through the upper air inlet 2002 when the suction device is drawing air in. This creates an accelerated airflow in the upper air chamber 2001, thereby achieving the suction of the lower air chamber 1100. For example, if the upper air inlet 2002 is located at the front end of the upper chamber 2000, when the suction device moves with the sweeper, the front end of the suction device forms the windward end, making it easier for outside air to enter the upper air chamber 2001 through the upper air inlet 2002.

[0058] Combination Figure 3 and Figure 4 As shown, in some embodiments of this application, the direction from the rear end of the suction device to the front end of the suction device is the direction of travel of the suction device. Between the front end and the rear end of the suction device, the upper chamber 2000 is provided with an extension section 2100 and a contraction section 2200. The air in the upper air chamber 2001 is adapted to be accelerated in the contraction section 2200, thus simplifying the air acceleration structure.

[0059] Specifically, when the suction nozzle device is applied to a road sweeper, the end closer to the front of the vehicle is the front end, and the end closer to the vehicle position is the rear end. The upper chamber 2000 is provided with an expansion section 2100 and a contraction section 2200 along the front-to-back direction. When outside air enters the upper air chamber 2001 through the upper air inlet 2002, it passes through the expansion section 2100 and the contraction section 2200 in sequence. When the air enters the contraction section 2200 from the expansion section 2100, the cross-sectional area through which the air passes becomes smaller (the cross-section is formed in the vertical direction). This increases the air velocity and reduces the pressure, and the pressure reduction creates a negative pressure zone. It is understandable that the terms "expansion section 2100" and "contraction section 2200" are relative. The expansion section 2100 has a larger cross-sectional area, while the constriction section 2200 has a smaller cross-sectional area, with the cross-section roughly perpendicular to the airflow direction. Thus, when air enters the constriction section 2200 from the expansion section 2100, the smaller cross-sectional area increases the air velocity, which in turn reduces the pressure. Therefore, based on the formation of a negative pressure zone, the inlet 2003 is positioned close to this zone to facilitate the suction of the lower air chamber 1100.

[0060] It is understood that the expansion segment 2100 can expand gradually or suddenly, and the contraction segment 2200 can contract gradually or suddenly. Preferably, a gradual transition is formed between the expansion segment 2100 and the contraction segment 2200. For example, there is a transition portion (2110 / 2220) between the expansion segment 2100 and the contraction segment 2200. This transition portion (2110 / 2220) is gradually transitioned. In the direction from front to back, the transition portion 2220 adjacent to the expansion segment 2100 is gradually contracted, and this transition portion 2220 can be regarded as part of the contraction segment 2200; the transition portion 2210 adjacent to the contraction segment 2200 is gradually expanded, and this transition portion 2210 can be regarded as part of the expansion segment 2100.

[0061] Optionally, in some embodiments of this application, the following combination is continued: Figure 3 and Figure 4 As shown, the expansion section 2100 and the contraction section 2200 each include multiple sections, and the expansion section 2100 and the contraction section 2200 are arranged alternately. The inlet 2003 is located in the expansion section 2100 and / or the contraction section 2200. In this way, the lower air chamber 1100 is sucked in the front and rear directions of the suction nozzle device, thereby achieving a large-scale airflow enhancement of the lower air chamber 1100 and effectively avoiding leakage.

[0062] For example, along the front-to-back direction of the suction device, the expansion section 2100 and the contraction section 2200 are arranged alternately, with the expansion section 2100 located at the very front. When the suction device (fan) is suctioning, a certain negative pressure is formed in the upper air chamber 2001, and outside air enters the upper air chamber 2001 through the upper air inlet 2002. The air in the upper air chamber 2001 is accelerated after passing through the expansion section 2100 and entering the contraction section 2200. Since the expansion section 2100 and the contraction section 2200 are arranged alternately along the front-to-back direction, each expansion section 2100 and contraction section 2200 corresponds to a drain port 2003. Therefore, in the front-to-back direction of the suction device, the drain port 2003 enables a large-scale upward airflow in the lower air chamber 1100, thereby lifting and carrying the garbage upward in both the front and back directions of the suction device.

[0063] Because the sweeper moves at a certain speed, if the front of the suction nozzle doesn't reach the surface to suck up the garbage, the garbage may also be sucked up by the rear of the nozzle. Since the negative pressure zone at the front of the nozzle has already loosened the garbage to some extent, when the rear of the nozzle aligns with the garbage, the upward lifting and carrying action of the nozzle makes it easier to re-suck up any missed garbage. This further prevents garbage from being missed and greatly improves the cleaning effect.

[0064] Because the expansion section 2100 and the contraction section 2200 are arranged alternately, the airflow ejected from the contraction section 2200 is immediately accelerated again after entering the expansion section 2100, and this process is repeated. Therefore, negative pressure zones can be formed in both the contraction section 2200 and the expansion section 2100, thereby achieving suction of the lower air chamber 1100. Therefore, the drain port 2003 can be set in the expansion section 2100 and / or the contraction section 2200. In some embodiments, the drain port 2003 can be set in the expansion section 2100. In this way, since the airflow here is slightly lower than that in the contraction section 2200, but because the garbage has a certain volume, when the garbage enters from the expansion section 2100, it is easier to change direction and move along the airflow in the upper air chamber 2001.

[0065] Combination Figures 5 to 7 As shown, in some embodiments of this application, the cross-sectional area of ​​the front contraction section 2200 is larger than that of the rear contraction section 2200 in the direction from front to back. This allows the airflow in the upper air chamber 2001 to be continuously accelerated in the direction from front to back, forming a jet stream. The closer the lower air chamber 1100 is to the suction pipe 3000, the more obvious the suction effect of the upper air chamber 2001 on the lower air chamber 1100, and the stronger the lifting and carrying capacity of the garbage.

[0066] For example, the contraction section 2200 has n levels, namely 1, 2, 3, 4, 5…n, with the first level being at the very front and the nth level at the very back. The cross-sectional area of ​​the first-level contraction section 2200 is smaller than that of the second-level contraction section 2200, the second-level contraction section 2200 is smaller than that of the third-level contraction section 2200, and so on. From front to back, the cross-sectional area of ​​each level of contraction section 2200 gradually decreases. As the airflow passes through each level of contraction section 2200 in sequence, the air velocity is gradually increased. The closer to the rear end of the suction device, the faster the air velocity in the upper air chamber 2001, resulting in a stronger jet effect and a greater negative pressure. This further enhances the suction of the lower air chamber 1100 through the inlet 2003.

[0067] The suction effect of the upper air chamber 2001 on the lower air chamber 1100 means that if the front end of the suction device cannot effectively suck up road debris, it's either because the debris is thick or the debris is firmly adhered to the road surface. When the suction device sweeps over the debris, the upward airflow generated at the front end of the suction device lifts and carries the loose debris upwards. Some debris can enter the upper air chamber 2001 through the inlet 2003, while some debris can be sucked into the suction pipe 3000 by the airflow in the lower air chamber 1100. When the rear end of the suction device moves to the debris, the upper air chamber 2001 at the rear end of the suction device creates a stronger suction effect on the lower air chamber 1100, making the upward airflow in the lower air chamber 1100 more turbulent. This further lifts and carries the debris off the road, thus enhancing the suction capacity and preventing debris from being missed.

[0068] Combination Figure 5 and Figure 7 As shown, in some embodiments of this application, the drainage port 2003 is rectangular and extends along both sides in the front-to-back direction, that is, along... Figure 1 The left and right sides extend and the contraction section 2200 includes a straight section 2210. The straight section 2210 has two relatively parallel planes, and the height formed between the two planes is h, which satisfies h n =λ n-1 w, where n is the order of the contraction segment 2200, h n The distance between the two planes of the nth level contraction section (2200) is λ. The first level is located at the front end of the suction device, and the nth level is located at the rear end of the suction device. λ = 0.5 to 0.8 is the airflow acceleration factor, and w is the width of the inlet 2003 along the front-back direction. This makes the upper air chamber 2001 produce a positive suction effect on the lower air chamber 1100, achieving better upward suction.

[0069] Specifically, the cross-sectional area of ​​the multiple contraction sections 2200 decreases sequentially from front to back by varying the height of the contraction sections 2200. Each contraction section 2200 has a straight section 2210, which has two relatively parallel planes. The straight section 2210 is responsible for the main jetting action. Taking the suction device in normal suction mode as an example, the distance between the two planes constitutes the height h. Along the front-to-back direction, the heights h of the straight sections 2210 of the multiple contraction sections 2200 are h1, h2, h3, h4, h5…h n The design of gradually decreasing height h effectively ensures that the air energy in the upper wind chamber 2001 is accelerated step by step.

[0070] Due to the suction effect of the upper air chamber 2001 on the lower air chamber 1100, in order to coordinate with the acceleration effect of the straight section 2210 of the various stages of the contraction section 2200, by satisfying h n =λ n-1 At this point, the air velocity accelerated by each level of the contraction section 2200 increases by at least 20%, thus making the suction effect of the upper air chamber 2001 on the lower air chamber 1100 more positive. This allows the air close to the road surface to be drawn in and accelerated, achieving the upward lifting and carrying of road debris. λ is the airflow acceleration factor. When the suction nozzle device is set larger, due to the increased size of the upper air chamber 2001 and the lower air chamber 1100, the airflow velocity of the contraction section 2200 needs to be greater to have a positive impact on the flow field near the road surface in the lower air chamber 1100, so λ takes a larger value; similarly, when the required suction nozzle device is set smaller, λ takes a smaller value.

[0071] Combination Figure 5 As shown, in some embodiments of this application, the suction nozzle device further includes a drainage tube 2300, which is disposed in the upper chamber 2000 to communicate with the drainage port 2003. The drainage tube 2300 extends downward into the lower air chamber 1100, thus ensuring the suction effect of the upper air chamber 2001 on the lower air chamber 1100, and generating a powerful lifting effect on the area close to the road surface.

[0072] For example, the drainage pipe 2300 is a hollow tube that can be integrally formed with the upper chamber 2000 and extends downwards towards the road surface. Without the drainage pipe 2300, the drainage port 2003 alone can achieve suction in the lower air chamber 1100 and lift and carry road debris upwards. When the drainage pipe 2300 is installed, it extends into the lower air chamber 1100, thus getting closer to the road surface. This allows for greater disturbance to the flow of debris in the area near the road surface, resulting in a more powerful lifting and carrying effect on the debris.

[0073] Optionally, in some embodiments of this application, the distance from the lower end of the drainage tube 2300 to the working surface is h. t , satisfying ht =ζH, where ζ = 0.65~0.8 is the height proportional factor of the drainage pipe 2300, and H is the distance from the top of the upper chamber 2000 to the working surface. This way, the drainage pipe 2300 can enhance the suction of the road surface, while also ensuring the passability of the lower air chamber 1100.

[0074] Specifically, when the suction nozzle device is applied to a road sweeper, the working surface is the road surface. While the diversion pipe 2300 enhances the suction of the road surface, it also extends into the lower air chamber 1100. Since not all road debris is drawn into the upper air chamber 2001 and collected in the garbage bin, some debris still needs to be drawn through the lower air chamber 1100 to the suction pipe 3000 and then sent to the garbage bin. Therefore, to avoid the diversion pipe 2300 affecting the flow of debris in the lower air chamber 1100, the following conditions are met: t =ζH, where ζ is the height proportional factor of the diversion pipe 2300, and the value of ζ is between 0.65 and 0.8. This ensures that the diversion pipe 2300 can introduce the airflow near the road surface into the upper air chamber 2001 without making the diversion pipe 2300 too long and causing garbage to get stuck. In this way, while ensuring the suction effect of the upper air chamber 2001 on the lower air chamber 1100 through the diversion pipe 2300, the height of the diversion pipe 2300 is made as high as possible to ensure the passage of garbage in the lower air chamber 1100 and avoid garbage being blocked. This balances the enhanced suction effect of the upper air chamber 2001 and the garbage suction in the lower air chamber 1100, so that the two work together to enhance the garbage cleaning effect on the road surface.

[0075] Combination Figure 6 As shown, in some embodiments of this application, the direction from the rear end of the suction device to the front end of the suction device is the direction of travel of the suction device; the suction device also includes an air inlet pipe 2400, which is located at the front end of the upper chamber 2000. The rear end of the air inlet pipe 2400 is connected to the upper air inlet 2002, and the front end of the air inlet pipe is located in front of the lower air inlet 1200. The air inlet pipe 2400 extends forward and downward at an angle.

[0076] Specifically, the lower air inlet 1200 formed by the lower chamber 1000 is relatively small, that is, the opening is relatively small, so that a certain negative pressure can be maintained in the lower air chamber 1100, so that the garbage can be sucked into the lower air chamber 1100 through the lower air inlet 1200. Because of the small size of the lower air inlet 1200, in order to ensure that the air entering the upper air chamber 2001 can be accelerated through the contraction section 2200 to form a suction on the lower air chamber 1100, and at the same time to prevent the air flow in the lower air chamber 1100 from being too small and causing the garbage to not be effectively picked up, an air inlet pipe 2400 is set up. The air inlet pipe 2400 is connected to the upper air inlet 2002 and extends forward and downward. This makes it easier to configure the air flow ratio in the upper air chamber 2001 and the lower air chamber 1100 to be about 3:7. This effectively meets the flow requirements in the upper air chamber 2001 and the lower air chamber 1100, and also creates a bypass effect on the air in front of the lower air inlet 1200, which is conducive to the garbage in front of the lower air inlet 1200 entering the lower air inlet 1200 more smoothly.

[0077] Optionally, in some embodiments of this application, the angle formed between the extension direction of the intake pipe 2400 and the vertical direction is θ, and θ = 55° to 65°; the distance between the end of the intake pipe 2400 and the working surface is h0, satisfying h0 = ξH, where ξ = 0.6 to 0.7, which is the height scaling factor of the intake pipe 2400.

[0078] Specifically, taking the suction nozzle device in normal use as a reference, the air intake pipe 2400 extends at an angle relative to the vertical direction, forming an angle with the vertical direction, such as... Figure 7 As shown, the vertical direction is the up-down direction. In order to effectively ensure the airflow in the upper air chamber 2001 and the lower air chamber 1100, and to ensure that the upper air chamber 2001 draws air from the lower air chamber 1100 while ensuring normal flow in the lower air chamber 1100, the values ​​of θ and ξ are limited to ensure that the airflow entering the upper air chamber 2001 from the upper air inlet 2002 accounts for 25%-35% of the total flow of the suction pipe 3000. This better distributes the air ratio between the upper air chamber 2001 and the lower air chamber 1100, thereby achieving a more effective suction effect.

[0079] Optionally, in some embodiments, combined with Figure 1 and Figure 2As shown, the contraction section 2200 has a length dimension along the first direction, and the extension section 2100 also has a length dimension along the first direction. The first direction intersects with the direction of airflow in the upper air cavity 2001, and preferably the first direction is perpendicular to the direction of airflow. For example, the first direction is the left-right direction shown in the figure. Thus, the individual contraction section 2200 and extension section 2100 form a large span direction along the first direction. The extension section 2100 is located at the foremost end. From front to back, the extension section 2100 and the contraction section 2200 are arranged alternately, and the extension section 2100 is also located at the rear end. The air inlet pipe 2400 is connected to the extension section 2100 at the front end, while the suction pipe 3000 is adjacent to the extension section 2100 at the rear end. Each extension section 2100 is provided with a rectangular inlet 2003 extending in the left and right direction, and the inlet 2003 is connected to the inlet pipe 2300 extending downward into the lower air chamber 1100. In this way, with the cooperation of multiple contraction sections 2200 and extension sections 2100 in the front and rear directions, the lifting and carrying effect of garbage on the road surface is enhanced, forming a large-scale continuous suction effect on the road surface, making the suction effect of the entire suction nozzle device more significant.

[0080] This application also discloses a road sweeper that includes the aforementioned suction nozzle device. In this embodiment, the structure of the suction nozzle device is the same as described in the above embodiments. Since the road sweeper adopts the technical solutions of the above embodiments, it at least possesses the advantages brought by the technical solutions of the above embodiments, which will not be elaborated further here.

[0081] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A suction nozzle device, characterized in that, include: The lower chamber (1000) is provided with a lower air chamber (1100), and a lower air inlet (1200) and a lower air outlet (1300) communicating with the lower air chamber (1100). The lower air inlet (1200) is connected to the outside and the lower air chamber (1100). An upper chamber (2000), located above the lower chamber (1000), includes an upper air chamber (2001), an upper air inlet (2002), an air outlet (2003), and an upper exhaust outlet (2004) communicating with the upper air chamber (2001). The upper air inlet (2002) connects to the outside environment and the upper air chamber (2001). The air outlet (2003) connects the upper air chamber (2001) and the lower air chamber (1100). The upper chamber (2000) is adapted to accelerate the air in the upper air chamber (2001) to draw air into the lower air chamber (1100) through the air outlet (2003). A straw that connects the upper exhaust port (2004) and the lower exhaust port (1300); The direction from the rear end of the suction device to the front end of the suction device is the direction of travel of the suction device. Between the front end and the rear end of the suction device, the upper chamber (2000) is provided with an expansion section (2100) and a contraction section (2200). The air in the upper air chamber (2001) is adapted to be accelerated in the contraction section (2200). The expansion segment (2100) and the contraction segment (2200) each include multiple segments, and the expansion segment (2100) and the contraction segment (2200) are arranged alternately. The drainage port (2003) is provided in the expansion segment (2100) and / or the contraction segment (2200). Each expansion segment (2100) and the contraction segment (2200) has a corresponding drainage port (2003). Along the front-to-back direction, the cross-sectional area of ​​the contraction segment (2200) located at the front is greater than the cross-sectional area of ​​the contraction segment (2200) located at the rear. The suction nozzle device also includes a drainage tube (2300), which is located in the upper chamber (2000) and communicates with the drainage port (2003). The drainage tube (2300) extends downward into the lower air chamber (1100). The suction device also includes an air inlet pipe (2400), which is located at the front end of the upper chamber (2000), and the rear end of the air inlet pipe (2400) is connected to the upper air inlet (2002).

2. The suction nozzle device according to claim 1, characterized in that, The drainage port is rectangular and extends on both sides in the front-to-back direction; The contraction segment (2200) includes a straight segment (2210), which has two relatively parallel planes with a distance h between them, satisfying h n =λ n-1 w, where n is the order of the contraction segment (2200), h n The distance between the two planes of the nth level contraction section (2200) is λ, the first level is located at the front end of the suction device, and the nth level is located at the rear end of the suction device. λ = 0.5~0.8 is the airflow acceleration factor, and w is the width of the drainage port (2003) in the front-back direction.

3. The suction nozzle device according to claim 1, characterized in that, The distance from the lower end of the drainage tube (2300) to the working surface is h. t , satisfying h t =ζH, where ζ = 0.65~0.8 is the height ratio factor of the drainage tube, and H is the distance from the top of the upper chamber (2000) to the working surface.

4. The suction nozzle device according to claim 1, characterized in that, The direction from the rear end of the suction device to the front end of the suction device is the direction of travel of the suction device; The front end of the air intake pipe (2400) is located in front of the lower air intake (1200), and the air intake pipe (2400) extends forward and downward at an angle.

5. The suction nozzle device according to claim 4, characterized in that, The angle formed between the extension direction of the air intake pipe (2400) and the vertical direction is θ, and θ = 55°~65°; The distance from the end of the intake pipe (2400) to the working surface is h0, which satisfies h0=ξH, where ξ=0.6~0.7, which is the intake pipe height proportionality factor.

6. A road sweeper, characterized in that, The sweeper includes the suction nozzle device as described in any one of claims 1 to 5.

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