Exhaust device for elevator and elevator comprising same

Abstract

The invention provides an air exhaust device for an elevator, which comprises an air exhaust part mounted at the top of a car of the elevator and configured to suck air inside the car to the outside of the elevator so as to form an air exhaust flow in the vertical direction; the air supply part surrounds the outside of the air exhaust part, forms a mutually independent space with the air exhaust part, and is constructed to convey air supply jet flow into the lift car in the horizontal direction through a plurality of air supply outlets formed in the circumferential side wall of the air supply part, so that the air supply jet flow forms negative pressure around the air supply outlets, and exhaust air flow near the air supply jet flow is entrained; and the air suction area at the air exhaust opening of the air exhaust part is reduced, so that the air suction distance of the air exhaust part is increased.

Description

Technical Field

[0001] At least one embodiment of the present invention relates to the technical field of indoor ventilation devices, and in particular to an exhaust device for an elevator and an elevator comprising the exhaust device. Background Art

[0002] As the height of buildings continues to increase, elevators have become one of the most important equipment in high-rise buildings. As a result, people are increasingly concerned about the public health and safety inside the elevator car when riding it.

[0003] The space inside the elevator is small and crowded, and the distance between people is very close. In addition, most existing elevators use mixed ventilation or natural ventilation systems. This means that when passengers carry the virus inside the elevator, the virus aerosols exhaled by the passengers mix with the fresh air and diffuse throughout the elevator cabin, and the virus aerosols cannot be quickly discharged from the elevator space. These virus aerosols may be inhaled by susceptible people, or deposited on the surface of the cabin and suspended in the air inside the cabin, which may lead to direct and indirect transmission of the virus and easily cause cross-infection between passengers. Summary of the invention

[0004] In view of this, the present invention provides an exhaust device for an elevator, which reduces the content of viral aerosols attached to the surface of the car and in the air inside the car.

[0005] According to an embodiment of the present invention, there is provided an exhaust device for an elevator, comprising: an exhaust section, installed on the top of the elevator car, and configured to draw air inside the car to the outside of the elevator to form an exhaust airflow in the vertical direction; and an air supply section, surrounding the outside of the exhaust section to form a mutually independent space with the exhaust section, and configured to convey supply air jets to the interior of the car in a horizontal direction through a plurality of air supply ports arranged on the circumferential side walls of the air supply section, so that the supply air jets form a negative pressure around the air supply ports, sucking in the exhaust airflow near the supply air jets, reducing the suction area at the exhaust ports of the exhaust section, so as to increase the suction distance of the exhaust section.

[0006] According to an embodiment of the present invention, the air supply part includes: an air supply cylinder, which is constructed as a hollow annular cylinder and surrounds the outside of the exhaust part, and a plurality of air supply ports are formed on the side wall of the air supply cylinder; and an air blower, which is connected to the air supply cylinder through an air supply pipe so as to transport air jets in a horizontal direction to the interior of the car through the air supply cylinder.

[0007] According to an embodiment of the present invention, the air supply part also includes: a pressure stabilizing chamber, which is constructed as a hollow annular cylinder and surrounds the outside of the exhaust part between the air supply pipe and the air supply cylinder, and the pressure stabilizing chamber is constructed so that the initial air supply jet output by the blower is evenly delivered to the air supply cylinder.

[0008] According to an embodiment of the present invention, two air supply pipes are arranged on the top of the pressure stabilizing chamber, and the two air supply pipes are symmetrically arranged about the axis of the pressure stabilizing chamber.

[0009] According to an embodiment of the present invention, the exhaust part includes: an exhaust duct installed on the top of the elevator car and constructed in a roughly cylindrical shape, the exhaust duct extends to the lower side of the air supply part and is connected to the interior of the car; and an exhaust fan installed at the air outlet end of the exhaust duct, so that the air inside the car is drawn out to the outside of the elevator by the exhaust fan through the exhaust duct.

[0010] According to an embodiment of the present invention, the exhaust device further comprises: a wind speed measuring unit, mounted on the side wall of the car, adapted to obtain a first variation interval (U1) of the impact speed U1 when the air supply jet hits the side wall of the car 11 ,U 12 ); According to the first variation interval (U 11 ,U 12 ), controlling the output power of the blower to control the second variation interval (U0) of the initial velocity U0 of the blower jet when it flows out from the blower port of the blower unit 01 ,U 02 ) so that the air supply jet hits the car side wall and then flows downward along the car side wall.

[0011] According to an embodiment of the present invention, the wind speed measuring unit can also obtain a third variation interval (U2) of the terminal velocity U2 when the air supply jet flows downward along the side wall of the car for a distance s. 21 ,U 22 ); According to the third variation interval (U 21 ,U 22 ), further controlling the output power of the blower to further control the fourth variation interval (U0) of the initial velocity U0 of the blower jet when it flows out from the blower port of the blower unit. 03 ,U 04 ), so that the third variation interval (U 21 ,U 22 ) satisfies the human body comfortable wind speed range; wherein, when the air supply jet hits the side wall of the car and flows downward through a distance s, it is located in the breathing zone of the occupant in the height direction, and the fourth change interval (U 03 ,U04 ) falls within the second variation interval (U 01 ,U 02 )Inside.

[0012] According to an embodiment of the present invention, the relationship between the final velocity U2, the initial velocity U0, the distance s along the side wall of the car through which the air supply jet flows, and the hydraulic diameter d0 of the air supply port of the air supply unit is:

[0013] .

[0014] According to an embodiment of the present invention, the comfortable wind speed range for the human body is 0.05-0.15 m / s.

[0015] According to an embodiment of the present invention, there is further provided an elevator, comprising: a car; and the exhaust device for the elevator as described in the above embodiment, wherein the exhaust device is installed on the top of the car.

[0016] According to the exhaust device for elevators of the above-mentioned embodiment of the present invention, the air supply part transmits air supply jets to the interior of the car in a horizontal direction through a plurality of air supply ports arranged on its own circumferential side wall, so that the air supply jets form a negative pressure around the air supply ports, suck in the exhaust air flow near the air supply jets, reduce the air suction area at the air outlet of the exhaust part, increase the air suction distance of the exhaust part, and reduce the content of viral aerosols attached to the surface of the car and in the air inside the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional schematic diagram of an exhaust device for an elevator and an elevator car according to an embodiment of the present invention;

[0018] Figure 2 is a side view between an exhaust device for an elevator and an elevator car according to an embodiment of the present invention;

[0019] Figure 3 Schematic diagram of air flow during operation of an exhaust device for an elevator according to an embodiment of the present invention;

[0020] Figure 4 It is a three-dimensional schematic diagram of an air supply cylinder, a pressure stabilizing chamber, an air supply pipe and an exhaust pipe of an exhaust device for an elevator according to an embodiment of the present invention;

[0021] Figure 5 is a cross-sectional view of an air supply tube, a pressure stabilizing chamber, an air supply pipe and an air exhaust pipe of an exhaust device for an elevator according to an embodiment of the present invention;

[0022] Figure 6 is a jet attenuation fitting curve diagram of the air supply jets with different initial velocities of the exhaust device for elevators according to an embodiment of the present invention;

[0023] Figure 7 It is a schematic diagram for comparing the principles of an exhaust device for an elevator according to an embodiment of the present invention with a mixed ventilation system, a displacement ventilation system, and a local exhaust system;

[0024] Figure 8 is based on Figure 7 Comparative diagram of the distribution of virus aerosols inside the car when the four exhaust devices exhaust for 120s;

[0025] Fig. 9 is based on Figure 7 Comparison chart of the distribution concentration of virus aerosols inside the car when the four exhaust devices exhaust for 120 seconds; and

[0026] Fig.10 is based on Figure 7 Schematic diagram of the comparison of virus aerosol concentrations in the occupants' breathing zone after the operation of the four exhaust devices.

[0027] In the figure:

[0028] 1-air supply unit; 11-air supply port; 12-air supply tube; 13-air supply fan; 14-air supply pipe; 15-pressure stabilizing chamber;

[0029] 2-exhaust part; 21-exhaust port; 22-exhaust pipe; 23-exhaust fan;

[0030] 3- Wind speed measurement unit;

[0031] 4-Car. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0033] According to the inventive concept of one aspect of the present invention, there is provided an exhaust device for an elevator, comprising: an exhaust section, installed on the top of the elevator car, and configured to draw air inside the car to the outside of the elevator to form an exhaust airflow in the vertical direction; and an air supply section, surrounding the outside of the exhaust section to form a mutually independent space with the exhaust section, and configured to convey supply air jets to the interior of the car in a horizontal direction through a plurality of supply air ports arranged on the circumferential side wall of the air supply section, so that the supply air jets form a negative pressure around the supply air ports, and entrain the exhaust airflow near the supply air jets, thereby reducing the suction area at the exhaust port of the exhaust section to increase the suction distance of the exhaust section.

[0034] Figure 1 is a three-dimensional schematic diagram of an exhaust device for an elevator and an elevator car according to an embodiment of the present invention; Figure 2is a side view between an exhaust device for an elevator and an elevator car according to an embodiment of the present invention; Figure 3 The figure is a schematic diagram of airflow during operation of an exhaust device for an elevator according to an embodiment of the present invention.

[0035] According to an exemplary embodiment of the present invention, please refer to Figure 1-Figure 3 , an exhaust device for an elevator is provided, comprising an exhaust section 2 and an air supply section 1. The exhaust section 2 is installed on the top of the elevator car 4, and is configured to draw air inside the car 4 to the outside of the elevator to form an exhaust air flow in the vertical direction. The air supply section 1 surrounds the outside of the exhaust section 2, forming a mutually independent space with the exhaust section 2, and is configured to transport air jets to the inside of the car 4 in the horizontal direction through a plurality of air supply ports 11 arranged on the circumferential side wall of the air supply section 1, so that the air jets form a negative pressure around the air supply ports 11, and suck in the exhaust air flow near the air jets, thereby reducing the suction area at the exhaust ports 21 of the exhaust section 2, so as to increase the suction distance of the exhaust section 2.

[0036] In the prior art, in order to reduce the risk of cross-infection of viruses between passengers in the cabin, passengers are usually required to maintain a large social distance or wear masks. However, crowding inside the cabin is inevitable and the behavior of passengers is difficult to guarantee. Therefore, it is particularly important to protect the health of passengers by increasing the exhaust rate of virus aerosols inside the cabin by the exhaust device.

[0037] In this embodiment, the air supply part 1 delivers air jets to the interior of the car 4 in a horizontal direction through a plurality of air supply ports 11 arranged on its own circumferential side wall, so that the air supply jets form a negative pressure around the air supply ports 11, sucking in the exhaust air flow near the air supply jets, reducing the suction area at the exhaust ports 21 of the exhaust part 2, thereby increasing the suction distance of the exhaust part 2 and reducing the content of viral aerosols attached to the surface of the car 4 and in the air inside the car 4.

[0038] Furthermore, the exhaust device of the embodiment of the present invention is installed on the top of the car 4, and full consideration is given to the fact that the diffusion of the virus aerosol inside the car 4 is not only affected by the exhaust system, but also by the thermal plume of the human body. In a high-density personnel space such as an elevator, small-particle virus aerosols will move upward with the thermal plume of the human body, so that at the moment of release of the virus aerosol, it cooperates with the thermal plume of the human body to remove the virus aerosol in real time.

[0039] Figure 4 It is a three-dimensional schematic diagram of an air supply cylinder, a pressure stabilizing chamber, an air supply pipe and an exhaust pipe of an exhaust device for an elevator according to an embodiment of the present invention; Figure 5 The present invention is a cross-sectional view of an air supply tube, a pressure stabilizing chamber, an air supply pipe and an air exhaust pipe of an exhaust device for an elevator according to an embodiment of the present invention.

[0040] In some exemplary embodiments, referring to Figure 1-Figure 5 The air supply part 1 includes an air supply cylinder 12 and an air blower 13. The air supply cylinder 12 is configured as a hollow annular cylinder, surrounding the outside of the exhaust part 2, and a plurality of air supply ports 11 are formed on the side wall of the air supply cylinder 12. The air blower 13 is connected to the air supply cylinder 12 through an air supply pipe 14, so as to deliver air supply jets to the interior of the car 4 in a horizontal direction through the air supply cylinder 12.

[0041] In this embodiment, the air supply tube 12 delivers air supply jets to the interior of the car 4 in a horizontal direction. Figure 3 As shown by the arrow A in the middle. The air supply jet forms a negative pressure around the air supply port 11, sucking the exhaust air near the air supply jet. The sucked exhaust air is as shown in FIG. Figure 3 As shown by the middle arrow B, the exhaust airflow sucked in occupies the exhaust volume of the exhaust port 21, thereby narrowing the suction area of ​​the exhaust port 21, thereby extending the suction distance of the exhaust part 2, forming a Figure 3 The exhaust air flow indicated by the middle arrow C is sucked away by the exhaust fan 23 along the exhaust pipe 22 through the exhaust port 21 .

[0042] In some exemplary embodiments, referring to Figure 3-Figure 5 The air supply unit 1 further includes a pressure stabilizing chamber 15. The pressure stabilizing chamber 15 is configured as a hollow annular cylinder, surrounding the outside of the exhaust unit 2 between the air supply pipe 14 and the air supply cylinder 12. The pressure stabilizing chamber 15 is configured so that the initial air supply jet output by the air supply fan 13 is uniformly delivered to the air supply cylinder 12.

[0043] Through the above arrangement, the initial air supply jet output by the blower 13 flows into the pressure stabilizing chamber 15 through the air supply pipe 14 , so that the initial air supply jet is evenly distributed inside the pressure stabilizing chamber 15 and evenly transported to the air supply cylinder 12 .

[0044] In some exemplary embodiments, referring to Figure 3-Figure 5 Two air supply pipes 14 are arranged on the top of the pressure stabilizing chamber 15 , and the two air supply pipes 14 are arranged symmetrically about the axis of the pressure stabilizing chamber 15 .

[0045] Through the above-mentioned arrangement, the initial air supply jet output by the blower 13 flows more evenly into the interior of the car 4 .

[0046] In some exemplary embodiments, referring to Figure 1-Figure 5 The exhaust part 2 includes an exhaust duct 22 and an exhaust fan 23. The exhaust duct 22 is installed on the top of the elevator car 4 and is configured to be roughly cylindrical. The exhaust duct 22 extends to the lower side of the air supply part 1 and is connected to the interior of the car 4. The exhaust fan 23 is installed at the air outlet end of the exhaust duct 22, so that the air inside the car 4 is drawn out to the outside of the elevator by the exhaust fan 23 through the exhaust duct 22.

[0047] In some exemplary embodiments, referring to Figure 3 The exhaust device also includes a wind speed measuring unit 3. The wind speed measuring unit 3 is installed on the side wall of the car 4 and is suitable for obtaining a first variation interval (U1) of the impact speed U1 when the air supply jet hits the side wall of the car 4. 11 ,U 12 ). According to the first variation interval (U 11 ,U 12 ), controlling the output power of the blower 13 to control the second variation interval (U ) of the initial velocity U0 of the blower jet when it flows out from the blower port 11 of the blower unit 1 01 ,U 02 ) so that the air supply jet hits the side wall of the car 4 and then flows downward along the side wall of the car 4.

[0048] In this embodiment, the geometric center of the exhaust device is located in the middle part of the top of the car 4. Based on the fixed area of ​​the air outlet 11, the output power of the blower 13 can be controlled to control the initial velocity U0 of the air jet when it flows out from the air outlet 11 of the air supply part 1, thereby ensuring that the velocity of the air jet decays to the same value when it reaches the left and right walls and no vortex is generated.

[0049] Due to the limited space, the air supply jet will collide with the side wall of the car 4, where Figure 3 After the air supply jet indicated by the middle arrow D collides with the side wall of the car 4, the speed of the air supply jet continuously decays as it flows downward along the side wall of the car 4, and finally the main flow disappears at the position in the height direction located in the breathing area of ​​the occupants, and will not affect the flow of the thermal plume of the human body. Figure 3 The air supply jet indicated by the arrow E in the middle has a large momentum due to its high speed. After colliding with the side wall of the car 4, it forms a local vortex under the influence of the exhaust air flow sucked in. Figure 3 As shown by the middle arrow F, the elimination of viral aerosols is hindered.

[0050] In some exemplary embodiments, referring to Figure 3 The wind speed measuring unit 3 can also obtain the third variation interval (U2) of the terminal velocity U2 when the air supply jet flows downward along the side wall of the car 4 for a distance s. 21 ,U 22 According to the third variation interval (U 21 ,U 22 ), further controlling the output power of the blower 13, so as to further control the fourth variation interval (U 03 ,U 04 ), so that the third variation interval (U 21 ,U 22) meets the comfortable wind speed range for human body. Among them, when the air supply jet hits the side wall of the car 4 and flows downward for a distance s, it is located in the breathing zone of the occupants in the height direction. 03 ,U 04 ) falls in the second variation interval (U 01 ,U 02 )Inside.

[0051] In this embodiment, the output power of the blower 13 is further controlled to further control the fourth variation interval (U 03 ,U 04 ), reduce the noise of the ventilation device and improve the blowing comfort for the passengers inside the car 4.

[0052] Figure 6 It is a jet attenuation fitting curve diagram of the supply air jets with different initial velocities of the exhaust device for elevators according to an embodiment of the present invention.

[0053] In some exemplary embodiments, the relationship between the final velocity U2, the initial velocity U0, the distance s along the side wall of the car 4 that the air supply jet flows, and the hydraulic diameter d0 of the air supply port 11 of the air supply unit 1 is:

[0054] .

[0055] It should be noted that, in this embodiment, Figure 6 As shown, the relationship between the final velocity U2, the initial velocity U0, the distance s that the air supply jet flows along the side wall of the car 4, and the hydraulic diameter d0 of the air supply port 11 of the air supply part 1 is obtained by fitting the jet attenuation trend of the air supply jet with different initial velocities.

[0056] Furthermore, through the relationship between the above-mentioned final velocity U2, initial velocity U0, the distance s that the air supply jet flows along the side wall of the car 4, and the hydraulic diameter d0 of the air supply port 11 of the air supply part 1, controlling the initial velocity U0 can also improve the universal applicability of the exhaust device of the embodiment of the present invention in elevators of different specifications.

[0057] In some exemplary embodiments, the comfortable wind speed range for the human body is 0.05-0.15 m / s.

[0058] Figure 7 The present invention is a schematic diagram of the principle comparison of the exhaust device for elevators and the mixed ventilation system, the displacement ventilation system, and the local exhaust system according to the embodiment of the present invention. Among them, I, II, III, and IV respectively represent the principle schematic diagrams of the mixed ventilation system, the displacement ventilation system, the local exhaust system, and the exhaust device according to the embodiment of the present invention.

[0059] It should be noted that the exhaust device of the embodiment of the present invention and the mixed ventilation system, displacement ventilation system, and local exhaust system in the prior art were respectively installed on multiple elevators to conduct a comparative experiment on the exhaust effect of virus aerosols inside the car 4. The ventilation rates of the above four ventilation systems are all 35 air changes per hour. Among them, the arrangement of the above four ventilation systems is as follows: Figure 7 shown.

[0060] The size of the elevator is set to be 2m in length, 1.65m in width and 2.5m in height. The elevator can accommodate 5 passengers with a height of 1.7m, and the 5 passengers are evenly distributed inside the car 4.

[0061] In a confined space, the heat generated by people will generate a heat plume, which will laterally suck in the surrounding air. In order to make the air supply jet flowing along the side wall of the car 4 at a distance s be sucked in at the same height plane as the heat source, play the role of critical air supply, and ensure that the collision with the side wall of the car 4 at a relatively close distance will not produce a vortex, s is set to 1.6 m. According to the relationship between the final velocity U2, the initial velocity U0, the distance s along the side wall of the car 4, and the hydraulic diameter d0 of the air supply port 11 of the air supply unit 1, the hydraulic diameter d0 of the air supply port 11 is set to 0.01 m, the final velocity U2 is 0.1 m / s, and the initial velocity U0 is 1.93 m / s. For the mixed ventilation system, the air supply area is fixed, the air supply velocity is 0.226 m / s, and the exhaust velocity of the local exhaust system is 2.554 m / s.

[0062] Figure 8 is based on Figure 7 Comparative diagram of the distribution of virus aerosols inside the car when the four exhaust devices exhaust for 120s; Fig. 9 is based on Figure 7 Comparison chart of the distribution concentration of virus aerosol inside the car after 120s of exhaust by four exhaust devices; Fig.10 is based on Figure 7 Schematic diagram of the comparison of virus aerosol concentrations in the occupants' breathing zone after the operation of the four exhaust devices.

[0063] When the above four ventilation systems run for 120 seconds, the spatial distribution of virus aerosols inside cabin 4 is as follows: Figure 8 As shown. It can be seen that at the moment of running 120s, the virus aerosol has been completely diffused inside the car 4, and the virus aerosol is distributed in various areas of the car 4. However, due to the thermal plume effect of the passengers in the car 4, the virus aerosol in the car 4 is mainly distributed in the upper part, and the virus aerosol distribution in the lower part of the human mouth area in the car 4 is relatively small. Among them, the mixed ventilation system, such as Figure 8 As shown in Figure 1, the residual amount of virus aerosol in the car 4 is the largest. However, the exhaust device of the embodiment of the present invention, such as Figure 8As shown in Figure IV, the residual amount of virus aerosol in cabin 4 is the least. Figure 8 As shown in II, the local exhaust system, such as Figure 8 As shown in Figure III, the residual amount of viral aerosol in cabin 4 is in the middle.

[0064] Fig. 9 The specific distribution of virus aerosol inside the car 4 is shown when the above four ventilation systems are running for 120s. Fig. 9 As shown in Figure 1, in the mixed ventilation system, 29.6% of the virus aerosols landed on the side walls of the car 4 and the occupants, while 54.3% of the virus aerosols remained suspended in the air, and only 16.1% of the virus aerosols were discharged. This indicates that the risk of occupants being exposed to virus aerosols and cross-infection is high. Fig. 9 As shown in Figure II, in the displacement ventilation system, 39.5% of the virus aerosols were deposited on the side walls of the car 4 and on the occupants, 21.7% of the virus aerosols were suspended in the air, and 38.8% of the virus aerosols were discharged. Fig. 9 As shown in Figure III, the performance of the local exhaust system is better than that of the mixed ventilation system and the displacement ventilation system. 46.1% of the virus aerosols are exhausted, but 29.0% of the virus aerosols are still deposited on the internal surface of the car 4 and on the occupants. Fig. 9 As shown in Figure IV, the exhaust device of the embodiment of the present invention has the highest exhaust efficiency, 61.4% of the virus aerosols are removed from the elevator, and only 9.6% of the virus aerosols remain suspended in the air, which is better than the other three exhaust systems. In general, the exhaust device of the embodiment of the present invention has the least amount of suspended virus aerosols when running for 120 seconds, which is only one-fifth of that of the mixed ventilation system, and its exhaust efficiency is more than 3 times that of the mixed ventilation system.

[0065] Fig.10 The concentration distribution of virus aerosol in the breathing zone of the occupants of the above four ventilation systems is shown, among which, Fig.10 I, II, III, and IV in the figure represent the concentration distribution of virus aerosol in the breathing zone of the occupants of the mixed ventilation system, the displacement ventilation system, the local exhaust system, and the exhaust device of the embodiment of the present invention, respectively. The breathing zone here is the area at the height of the human mouth and nose. The average virus aerosol mass concentration in the breathing zone of the mixed ventilation system is the highest, which is 2.03E -2 mg / cm³, while the average viral aerosol mass concentration in the breathing zone of the exhaust device of the embodiment of the present invention is the lowest, averaging 2.26E -3mg / cm³, which is about one-tenth of the mixed ventilation system. The displacement ventilation system and the local exhaust system are between the two. In the mixed ventilation system, the mass concentration of virus aerosols in some areas is as high as 10 mg / cm³. In contrast, the concentration of virus aerosols in the breathing zone of the exhaust device of the embodiment of the present invention is basically lower than 1E -4 mg / cm³.

[0066] According to an exemplary embodiment of the present invention, please refer to Figure 1-Figure 2 , an elevator is provided, comprising a car 4 and the exhaust device for the elevator described in the above embodiment. The exhaust device is installed on the top of the car 4.

[0067] Through the above-mentioned setting, the air supply jet of the exhaust device forms a negative pressure around the air supply port 11, sucking the exhaust air flow near the air supply jet, reducing the suction area at the exhaust port 21 of the exhaust part 2, so as to increase the suction distance of the exhaust part 2, reduce the content of virus aerosols attached to the surface of the car 4 and in the air inside the car 4, and reduce the probability of cross-infection of passengers inside the car 4. Further, by controlling the output power of the blower 13 of the exhaust device to control the initial speed U0 of the air supply jet when it flows out of the air supply port 11 of the air supply part 1, the effect of the air supply jet on the exhaust air flow near the air supply jet is improved, the noise of the exhaust device is reduced, and the comfort of blowing air for passengers inside the car 4 is improved.

[0068] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An exhaust device for an elevator, comprising: An exhaust unit (2) is installed on the top of the elevator car (4) and is configured to draw air inside the car (4) to the outside of the elevator to form an exhaust air flow in a vertical direction; as well as The air supply section (1) surrounds the outside of the exhaust section (2) and forms a space independent of the exhaust section (2). The air supply section (1) is configured to deliver air supply jets to the interior of the car (4) in a horizontal direction through a plurality of air supply ports (11) arranged on the circumferential side wall of the air supply section (1), so that the air supply jets form a negative pressure around the air supply ports (11), suck in the exhaust air flow near the air supply jets, reduce the air suction area at the exhaust port (21) of the exhaust section (2), and increase the air suction distance of the exhaust section (2).

2. The exhaust device for an elevator according to claim 1, wherein: The air supply unit (1) comprises: An air supply cylinder (12) is configured as a hollow annular column and surrounds the outside of the air exhaust portion (2), and a plurality of air supply ports (11) are formed on a side wall of the air supply cylinder (12); and The air blower (13) is connected to the air blower tube (12) via an air blower tube (14) so ​​as to deliver an air blower jet in a horizontal direction to the interior of the car (4) via the air blower tube (12).

3. The exhaust device for an elevator according to claim 2, wherein: The air supply unit (1) further comprises: The pressure stabilizing chamber (15) is constructed as a hollow annular cylinder and surrounds the outside of the exhaust portion (2) between the air supply pipe (14) and the air supply cylinder (12). The pressure stabilizing chamber (15) is constructed so that the initial air supply jet output by the air supply fan (13) is evenly delivered to the air supply cylinder (12).

4. The exhaust device for an elevator according to claim 3, wherein: Two air supply pipes (14) are arranged on the top of the pressure stabilizing chamber (15), and the two air supply pipes (14) are symmetrically arranged about the axis of the pressure stabilizing chamber (15).

5. The exhaust device for an elevator according to claim 1, wherein: The exhaust part (2) comprises: an exhaust duct (22) installed on the top of the elevator car (4) and configured in a substantially cylindrical shape, the exhaust duct (22) extending to the lower side of the air supply unit (1) and communicating with the interior of the car (4); and An exhaust fan (23) is installed at the air outlet end of the exhaust pipe (22), so that the air inside the elevator car (4) is drawn out to the outside of the elevator by the exhaust fan (23) through the exhaust pipe (22).

6. The exhaust device for an elevator according to claim 2, wherein: The exhaust device also includes: The wind speed measuring unit (3) is installed on the side wall of the car (4) and is suitable for obtaining a first variation interval (U1) of the impact speed U1 when the air supply jet hits the side wall of the car (4). 11 ,U 12 ); According to the first variation interval (U 11 ,U 12 ), controlling the output power of the blower (13) to control the second variation interval (U0) of the initial velocity U0 of the blower jet when it flows out from the blower port (11) of the blower part (1) 01 ,U 02 ) so that the air supply jet hits the side wall of the car (4) and then flows downward along the side wall of the car (4).

7. The exhaust device for an elevator according to claim 6, wherein: The wind speed measuring unit (3) can also obtain a third variation interval (U2) of the terminal velocity U2 of the air supply jet when the air supply jet flows downward along the side wall of the car (4) for a distance s. 21 ,U 22 ); According to the third variation interval (U 21 ,U 22 ), further controlling the output power of the blower (13), so as to further control the fourth variation interval (U0) of the initial velocity U0 of the blower jet when it flows out from the blower port (11) of the blower part (1) 03 ,U 04 ), so that the third variation interval (U 21 ,U 22 ) Meet the comfortable wind speed range for human body; When the air supply jet hits the side wall of the car (4) and flows downward for a distance s, it is located in the breathing zone of the occupants in the height direction. 03 ,U 04 ) falls within the second variation interval (U 01 ,U 02 )Inside.

8. The exhaust device for an elevator according to claim 7, wherein: The relationship between the final velocity U2, the initial velocity U0, the distance s that the air supply jet flows along the side wall of the car (4), and the hydraulic diameter d0 of the air supply port (11) of the air supply portion (1) is: 。 9. The exhaust device for an elevator according to claim 7, wherein: The comfortable wind speed range for the human body is 0.05-0.15m / s.

10. An elevator, comprising: Car (4); as well as The exhaust device for an elevator according to any one of claims 1 to 9, wherein the exhaust device is installed on the top of the car (4).

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