Elevator with negative pressure ventilation branch energy-saving fan

Abstract

The invention relates to the technical field of elevator fans, and discloses an elevator with a negative pressure ventilation branch energy-saving fan, the elevator comprises a double-air-path fan set and an elevator car, the double-air-path fan set is connected with an air scattering piece arranged in the elevator car, the bottom of the elevator car is provided with an air exhaust hole communicated with the outside, the double-air-path fan set comprises a shell, and the shell is provided with a negative pressure ventilation branch. A high-speed fan and a ventilation fan are arranged in the machine shell, a concentration cavity is formed in the air scattering piece, and the exhaust end of the ventilation fan and the inlet and outlet end of the high-speed fan are connected in the air scattering piece in series through the concentration cavity, so that the high-speed fan can rapidly suck air and exhaust air, and therefore equipment such as an air compressor is omitted in the double-air-path fan unit. And air in the elevator car is sucked in through the third air openings in the air scattering pieces, so that it is guaranteed that airflow in the elevator car can flow out rapidly, energy consumption is reduced, and meanwhile rapid ventilation can be conducted on the interior of the elevator car.

Description

Technical Field

[0001] This invention relates to the field of elevator fan technology, specifically to an elevator with an energy-saving fan for negative pressure ventilation branches. Background Technology

[0002] The main function of an elevator fan is to increase the air circulation in the elevator car, especially in high-rise elevators, otherwise it can easily cause dizziness. The motor drives the fan blades to rotate, which drives the airflow and exchanges indoor and outdoor air. It is also called an exhaust fan. The purpose of exhaust is to remove indoor polluted air, regulate temperature, and relieve human senses.

[0003] Patent application number 201711099765.5 discloses a negative pressure air purification device for elevators, relating to the field of elevator equipment technology. The device features mounting brackets at both ends of the front side of the housing, a mounting groove at the front end of the housing containing a detachable air inlet grille, a filter element inside the housing, and a sealing plate at the upper end of the filter element. The upper side of the sealing plate connects to a negative pressure chamber, and a negative pressure fan is installed at the upper end of the negative pressure chamber. An air outlet pipe is connected to the outlet of the negative pressure fan, penetrating the housing, and an air outlet screen is installed on the air outlet pipe. This technology requires a high-power negative pressure fan to ensure efficient air exchange inside the elevator, allowing the gas to flow at high speed towards the air outlet screen, thus enabling the air inside the elevator to be drawn into the air inlet grille for discharge.

[0004] Currently, elevator fans in existing elevators are limited by the shaft and internal space. To avoid excessive occupation of the shaft and internal space, most elevators on the market use small fans or high-energy-consuming fan units to exchange air and control temperature in the elevator car. Some systems separate air exchange and ventilation into two parts, installing a second ventilation system to clean stale air in the elevator, in addition to the regular ventilation fan. However, both high-energy-consuming motors and elevators with two ventilation systems have a significant drawback: to efficiently refresh the air inside the elevator, they consume more energy than a small fan alone. Furthermore, small fans cannot effectively refresh the air inside the elevator. Therefore, this does not meet current needs. To address this, we propose an elevator with an energy-saving fan in a negative pressure ventilation branch. Summary of the Invention

[0005] This invention provides an elevator with an energy-saving fan in a negative pressure ventilation branch, which eliminates the need for an additional fan and has the beneficial effect of high-efficiency replacement capability, thus solving the problems mentioned in the background art.

[0006] This invention provides the following technical solution: an elevator with an energy-saving fan and a negative pressure ventilation branch, comprising a dual-circuit fan unit and an elevator car. The dual-circuit fan unit is connected to a diffuser installed inside the elevator car. The bottom of the elevator car has an exhaust vent connecting to the outside. The dual-circuit fan unit includes a housing, inside which are a high-speed fan and a ventilation fan. The diffuser has a central cavity inside, and a first air outlet and a second air outlet penetrating the outer wall of the diffuser are provided in the central cavity. The first air outlet has an output duct connected to the output end of the ventilation fan, and the second air outlet has an intake duct connected to the input end of the high-speed fan. The diffuser also has an exhaust chamber inside, and the exhaust chamber has a connecting... The exhaust duct is connected to the output end of the high-speed fan. The end of the exhaust chamber away from the exhaust duct is provided with an exhaust port that communicates with the exhaust hole. The side of the diffuser facing the inner cavity of the elevator car is provided with a third air inlet. The exhaust chamber is provided with several negative pressure air inlets for connecting to the third air inlet. The exhaust end of the ventilation fan and the inlet and outlet ends of the high-speed fan are connected in series in the diffuser through a centralized cavity, so that the high-speed fan can quickly intake and exhaust air. This eliminates the need for equipment such as air compressors in the dual-air-path fan unit. Moreover, the air inside the elevator car is drawn in through the third air inlet on the diffuser, thereby ensuring that the airflow inside the elevator car can flow out quickly. This reduces energy consumption while also providing rapid ventilation inside the elevator car.

[0007] As an optional solution for an elevator with an energy-saving fan in a negative pressure ventilation branch as described in this invention, the horizontal plane of the negative pressure air inlet is inclined, and the angle between the inclined plane of the negative pressure air inlet and the airflow discharge direction of the exhaust chamber is greater than 120°.

[0008] As an optional elevator solution with a negative pressure ventilation branch energy-saving fan as described in this invention, the inner wall of the elevator car located at the exhaust hole and the outer wall of the diffuser located at the exhaust port form a tightly fitted sealed assembly structure.

[0009] As an optional solution for an elevator with an energy-saving fan for a negative pressure ventilation branch as described in this invention, wherein: a diffuser plate is provided on the side of the diffuser plate facing the inner cavity of the elevator car, the diffuser plate covers the front end of the central cavity, and through holes are evenly distributed at equal intervals on the diffuser plate.

[0010] As an optional solution for an elevator with an energy-saving fan in a negative pressure ventilation branch as described in this invention, the centralized cavity is provided with a filter element for filtering airflow, and the end face structure of the filter element is adapted to the end face structure of the diffuser plate.

[0011] As an alternative solution for an elevator with an energy-saving fan in a negative pressure ventilation branch as described in this invention, the width of the casing does not exceed the width of the elevator car.

[0012] As an optional solution for an elevator with a negative pressure ventilation branch energy-saving fan as described in this invention, the casing is composed of four side plates connected end to end and at least one cover plate. The cover plate is provided with a hollow grid corresponding to the high-speed fan and the ventilation fan, and a dustproof mesh is embedded in the hollow grid.

[0013] As an optional solution for an elevator with an energy-saving fan for a negative pressure ventilation branch as described in this invention, wherein: the horizontal plane of the air diffuser is parallel to the horizontal plane of the elevator car floor, and a pipe cavity is provided between the air diffuser and the top plate of the elevator car, wherein the exhaust pipe, the intake pipe and the output pipe are all located in the pipe cavity.

[0014] As an optional solution for an elevator with an energy-saving fan for a negative pressure ventilation branch as described in this invention, a sealing ring is provided at the point where the elevator car is penetrated by the exhaust duct, the intake duct, and the output duct in the duct cavity.

[0015] As an optional solution for an elevator with an energy-saving fan in a negative pressure ventilation branch as described in this invention, the elevator car is further provided with a control panel for controlling the high-speed fan and the ventilation fan.

[0016] The present invention has the following beneficial effects: 1. In this type of elevator with a negative pressure ventilation branch energy-saving fan, an output air duct is used to connect the output end of the ventilation fan and the first air outlet. Therefore, when the ventilation fan is started, the ventilation fan can exhaust airflow into the elevator car to exchange the air in the elevator car, so as to achieve the effect of regulating temperature and relieving human senses.

[0017] 2. In this type of elevator with a negative pressure ventilation branch energy-saving fan, the exhaust end of the ventilation fan and the inlet and outlet ends of the high-speed fan are connected in series in the diffuser through a centralized cavity. During extraction, the ventilation fan can remain open, allowing it to continue supplying airflow to the centralized cavity through the first air inlet. This enables the high-speed fan to simultaneously draw in the airflow inside the elevator car and the airflow generated by the ventilation fan through the second air inlet, thereby allowing the high-speed fan to draw in a large amount of gas in a short time to increase the exhaust airflow velocity.

[0018] 3. In this type of elevator with a negative pressure ventilation branch energy-saving fan, the high-speed fan discharges airflow to the exhaust port. At this time, due to the large air intake and the small cross-section of the exhaust port, the airflow velocity in the exhaust duct is relatively high. This allows the airflow to generate negative pressure on the third air inlet when it passes through the negative pressure air intake, thereby further introducing stale air from the elevator car into the exhaust chamber through the negative pressure air intake, thus accelerating the replacement of stale air inside the elevator car.

[0019] 4. In this type of elevator with a negative pressure ventilation branch energy-saving fan, the suction force generated by the negative pressure is greatest when the angle between the negative pressure air inlet and the airflow discharge direction in the exhaust chamber is 90°. Moreover, by reducing the inner diameter of the exhaust chamber, in this invention, the inner diameter of the exhaust chamber is slightly larger than the inner diameter of the exhaust duct, thereby reserving space for the flow of negative pressure intake gas, maximizing the use of negative pressure to discharge turbid gas, so as to achieve the purpose of energy saving and high efficiency. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of an elevator with an energy-saving fan for negative pressure ventilation branch circuits according to the present invention; Figure 2 This is a front view structural schematic diagram of an elevator with an energy-saving fan for negative pressure ventilation branch circuit according to the present invention; Figure 3 This is a rear view structural schematic diagram of an elevator with an energy-saving fan for negative pressure ventilation branch circuit according to the present invention; Figure 4 This is a top view of the dual-airflow fan unit of the present invention; Figure 5 This is a three-dimensional structural diagram of the air diffuser of the present invention; Figure 6 This is a half-sectional schematic diagram of the diffuser plate of the present invention; Figure 7 This is a three-dimensional structural diagram of the exhaust port of the present invention; Figure 8 This is a three-dimensional structural diagram of the diffuser plate of the present invention; Figure 9 This is a schematic diagram of the output air duct of the present invention; Figure 10 This is a schematic diagram of the exhaust port structure of the present invention.

[0021] In the diagram: 1. Dual-path fan unit; 10. High-speed fan; 11. Ventilation fan; 12. Casing; 100. Exhaust duct; 101. Intake duct; 110. Output duct; 120. Side plate; 121. Cover plate; 123. Hollowed-out grid; 124. Dustproof mesh cover; 2. Elevator car; 20. Exhaust vent; 3. Diffuser; 30. Centralized cavity; 31. Exhaust cavity; 32. Diffuser plate; 33. Filter element; 301. First air outlet; 302. Second air outlet; 303. Third air outlet; 310. Exhaust port; 311. Negative pressure air inlet; 320. Through hole; 4. Pipe cavity. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: This example aims to address the problem of poor ventilation in existing elevators, where low-power elevator fans can only provide basic air exchange and balance sensory perception. While high-power elevator fans can provide rapid ventilation, they require continuous operation, resulting in high energy consumption. Please refer to [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 8An elevator with a negative pressure ventilation branch energy-saving fan includes a dual-circuit fan unit 1 and an elevator car 2. The bottom of the elevator car 2 has an exhaust vent 20 connecting to the outside. The dual-circuit fan unit 1 includes a casing 12, within which a high-speed fan 10 and a ventilation fan 11 are housed. The high-speed fan 10 and the ventilation fan 11 are integrated together through the casing 12 and are located at the top of the elevator car 2. The elevator car 2 also has a control panel for controlling the high-speed fan 10 and the ventilation fan 11. The control panel allows for... To control the high-speed fan 10 and the ventilation fan 11, the dual-airflow fan unit 1 is connected to a diffuser 3 installed inside the elevator car 2. The diffuser 3 has a central chamber 30 and an exhaust chamber 31 inside. The central chamber 30 has a first air outlet 301 and a second air outlet 302 penetrating the outer wall of the diffuser 3. The diffuser 3 has a third air outlet 303 on the side facing the inner cavity of the elevator car 2. The first air outlet 301 has an output air duct 110 connected to the output end of the ventilation fan 11. When the ventilation fan 11 is working, it generates... Airflow enters the elevator car 2 through the first air inlet 301 of the diffuser 3, which is the normal ventilation state. The second air inlet 302 is equipped with an intake air pipe 101 connected to the input end of the high-speed fan 10, and the exhaust chamber 31 is equipped with an exhaust air pipe 100 connected to the output end of the high-speed fan 10. The high-speed fan 10 draws air from the elevator car 2 into the exhaust air pipe 100 through the second air inlet 302. The end of the exhaust chamber 31 away from the exhaust air pipe 100 is equipped with an exhaust port 310 that communicates with the exhaust hole 20. The exhaust chamber 31 is provided with several negative pressure air inlets 311 for connecting to the third air outlet 303. The airflow in the exhaust duct 100 is ejected at high speed from the exhaust port 20 through the exhaust port 310. At this time, since the third air outlet 303 is connected to the exhaust chamber 31 through the negative pressure air inlets 311, when the airflow in the exhaust chamber 31 is flowing at high speed, the exhaust chamber 31 will generate negative pressure suction to the third air outlet 303 through the negative pressure air inlets 311, thereby accelerating the discharge of turbid air in the elevator car 2.

[0024] In this embodiment: First, since the output duct 110 is used to connect the output end of the ventilation fan 11 and the first air outlet 301, when the ventilation fan 11 is started, the ventilation fan 11 can exhaust airflow into the elevator car 2 to exchange the air in the elevator car 2, so as to achieve the effect of regulating temperature and relieving human senses. Subsequently, the input end of the high-speed fan 10 is connected to the second air outlet 302 through the suction air pipe 101. Both the second air outlet 302 and the first air outlet 301 are located in the central cavity 30, so that the high-speed fan 10 can directly draw airflow through the central cavity 30. Thus, when the ventilation fan 11 and the high-speed fan 10 are started at the same time, the ventilation fan 11 can provide additional airflow to the high-speed fan 10 and enter the input end of the high-speed fan 10 synchronously with the air in the elevator car 2. In this way, while drawing in the turbid air in the elevator car 2, the air intake volume of the ventilation fan 11 can be increased. Then, the high-speed fan 10 directs the airflow through the exhaust duct 100 connected to its output end to the exhaust port 20. At this time, due to the large intake volume and the small cross-section of the exhaust port 20, the airflow velocity in the exhaust duct 100 is relatively high, which allows the airflow to generate negative pressure on the third air outlet 303 when it passes through the negative pressure intake port 311, thereby further introducing the turbid air in the elevator car 2 into the exhaust chamber 31 through the negative pressure intake port 311.

[0025] The working principle of this invention: This type of energy-saving elevator with negative pressure ventilation branch has two modes: daily ventilation and high-efficiency air exchange. In the daily ventilation mode: the ventilation fan 11 generates airflow and outputs the airflow through the output air duct 110 to the first air outlet 301, so that the airflow flows into the elevator car 2 through the concentration cavity 30 in the diffuser 3. In this mode, only the ventilation fan 11 is activated and only acts to stimulate the airflow inside and outside the elevator car 2, so as to balance human senses while maintaining ventilation. In the high-efficiency ventilation mode: a high-speed fan 10 draws air from the inside of the elevator car 2 through the diffuser 3. During this process, the ventilation fan 11 remains operational, continuing to supply airflow into the central chamber 30 through the first air vent 301. This allows the high-speed fan 10 to simultaneously draw in both the airflow from inside the elevator car 2 and the airflow generated by the ventilation fan 11 through the second air vent 302. This enables the high-speed fan 10 to draw in a large amount of gas in a short time, increasing the exhaust airflow velocity. During exhaust, the high-speed fan 10 directs the airflow... The air is discharged through the exhaust duct 100 connected to its output end to the exhaust hole 20. At this time, due to the large intake volume and the small cross-section of the exhaust hole 20, the airflow velocity in the exhaust duct 100 is relatively high. This allows the airflow to generate negative pressure on the third air outlet 303 when it passes through the negative pressure intake hole 311, thereby further introducing the turbid air in the elevator car 2 into the exhaust chamber 31 through the negative pressure intake hole 311. In this way, the exhaust speed is increased and the replacement of turbid air inside the elevator car 2 is accelerated while saving equipment such as air compressors. In summary, in this invention, the exhaust end of the ventilation fan 11 and the inlet and outlet ends of the high-speed fan 10 are connected in series in the diffuser 3 through the central cavity 30, so that the high-speed fan 10 can quickly intake and exhaust air, thereby eliminating the need for equipment such as air compressors in the dual-airflow fan unit 1. Moreover, the air inside the elevator car 2 is drawn in through the third air outlet 303 on the diffuser 3, thereby ensuring that the airflow inside the elevator car 2 can flow out quickly, thus reducing energy consumption while also quickly exchanging the air inside the elevator car 2.

[0026] Example 2 aims to address the issue of airflow returning to the elevator car 2 through the negative pressure inlet 311 during negative pressure exhaust. This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 4 , Figure 5 , Figure 6 and Figure 8 The horizontal plane of the negative pressure air inlet 311 is inclined, and the angle between the inclined plane of the negative pressure air inlet 311 and the airflow discharge direction of the exhaust chamber 31 is greater than 120°. The inner wall of the elevator car 2 located at the exhaust port 20 and the outer wall of the diffuser 3 located at the exhaust port 310 form a tightly fitted sealed assembly structure.

[0027] In this embodiment: when the airflow in the exhaust chamber 31 passes through the negative pressure air inlet 311, because the negative pressure air inlet 311 is inclined in the opposite direction of the airflow, the airflow cannot enter the negative pressure air inlet 311 at high speed. Moreover, when there is no assembly gap between the exhaust port 20 and the exhaust outlet 310, the airflow can be prevented from seeping into the elevator car 2 through the assembly joint between the diffuser 3 and the elevator car 2, thereby avoiding the problem of the exhaust turbid air flowing back into the elevator car 2.

[0028] It should be noted that when the angle between the negative pressure air inlet 311 and the airflow discharge direction in the exhaust chamber 31 is 90°, the suction force generated by the negative pressure is the greatest. Moreover, the gas flow rate in the exhaust chamber 31 can be further increased by reducing the inner diameter of the exhaust chamber 31. However, the gas flow rate in the exhaust chamber 31 with an excessively small inner diameter will also be reduced. Therefore, in this invention, the inner diameter of the exhaust chamber 31 is slightly larger than the inner diameter of the exhaust duct 100, thereby reserving space for the flow of negative pressure-inhaled gas and maximizing the use of negative pressure to discharge turbid gas, so as to achieve the purpose of energy saving and high efficiency.

[0029] Example 3 aims to address the problem that the air in the shaft carries a large amount of dust, and directly discharging it into elevator car 2 would exacerbate the air pollution in the elevator car. This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figure 1 and Figure 7 A diffuser plate 32 is provided on the side of the diffuser plate 3 facing the inner cavity of the elevator car 2. The diffuser plate 32 covers the front end of the central cavity 30. Through holes 320 are evenly distributed at equal intervals on the diffuser plate 32. A filter element 33 for filtering airflow is provided in the central cavity 30. The end face structure of the filter element 33 is adapted to the end face structure of the diffuser plate 32. The housing 12 is composed of four side plates 120 connected end to end and at least one cover plate 121. A perforated grid 123 is provided on the cover plate 121 corresponding to the high-speed fan 10 and the ventilation fan 11. A dustproof mesh cover 124 is embedded in the perforated grid 123.

[0030] In this embodiment, a filter element 33 is installed on the central cavity 30 of the diffuser plate 32 to filter the airflow blown into the elevator car 2. At the same time, a dustproof mesh cover 124 is embedded in the perforated grid 123 on the cover plate 121, so that air is filtered at the air inlet and outlet to better keep the air inside the elevator car 2 fresh.

[0031] Example 4 aims to improve the efficiency of cleaning and replacing stale air in elevator cars, and to avoid the problem of excessively large elevator fans that would occupy additional space in the shaft or inside the elevator. This example is an improvement on Example 1. For details, please refer to Example 1. Figure 1 , Figure 2 , Figure 3 , Figure 8 , Figure 9 and Figure 10 The housing 12 is composed of four side plates 120 connected end to end and at least one cover plate 121. The horizontal plane of the air diffuser 3 is parallel to the horizontal plane of the bottom plate of the elevator car 2. A pipe cavity 4 is provided between the air diffuser 3 and the top plate of the elevator car 2. The exhaust pipe 100, the intake pipe 101 and the output pipe 110 are all located in the pipe cavity 4. Sealing rings are provided at the penetration points of the elevator car 2 by the exhaust pipe 100, the intake pipe 101 and the output pipe 110 in the pipe cavity 4. The width of the housing 12 does not exceed the width of the elevator car 2.

[0032] In this embodiment: the dual-airflow fan unit 1 is installed on the top of the elevator car 2, and the air diffuser 3 is installed inside the elevator car 2 cavity, directly below the dual-airflow fan unit 1. The exhaust duct 100, intake duct 101, and output duct 110 are installed between the top plate of the elevator car 2 and the air diffuser 3, thereby maximizing the use of the elevator's internal space. In addition to the dual-airflow fan unit 1 occupying the shaft, all other components, including pipes, are built into the elevator car 2, so that the elevator can be installed in a matching shaft without needing to be reduced in size.

[0033] like Figure 8 , Figure 9 and Figure 10As shown, to enable the energy-saving fan in this type of elevator with negative pressure ventilation branch to operate more efficiently, the air diffuser 3 can be installed in the lower half of the elevator car 2 and attached to any side wall inside the elevator car 2 cavity. The optimal placement is on the side wall directly opposite the car door, where the diffuser plate 32 faces the door. This allows the descending turbid air to be blown out when the door is opened, thus slowing down the rate at which the air inside the elevator car 2 becomes turbid, reducing the frequency of the high-speed fan 10's start-up, and further... While this method reduces energy consumption, it requires extending the exhaust duct 100, the intake duct 101, and the output duct 110. When these extended ducts are built into the elevator car 2, they occupy the internal space of the elevator car 2. When they are placed externally on the elevator car 2, they occupy the space of the shaft. Therefore, this method is only suitable for situations where the shaft space is large. When the shaft space is small and the cavity of the elevator car 2 needs to be used efficiently, a horizontally suspended assembly method is more reasonable.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An elevator with a negative pressure ventilation branch energy-saving fan, comprising a dual-airflow fan unit (1) and an elevator car (2), wherein the dual-airflow fan unit (1) is connected to a diffuser (3) disposed in the elevator car (2), and the bottom of the elevator car (2) is provided with an exhaust vent (20) communicating with the outside, characterized in that: The dual-airflow fan unit (1) includes a housing (12), and a high-speed fan (10) and a ventilation fan (11) are provided inside the housing (12); The diffuser (3) has a central cavity (30) inside. The central cavity (30) has a first air outlet (301) and a second air outlet (302) that penetrate the outer wall of the diffuser (3). The first air outlet (301) is provided with an output air duct (110) that connects to the output end of the ventilation fan (11). The second air outlet (302) is provided with an intake air duct (101) that connects to the input end of the high-speed fan (10). The diffuser (3) is also provided with an exhaust chamber (31) inside. The exhaust chamber (31) is provided with an exhaust pipe (100) connected to the output end of the high-speed fan (10). The end of the exhaust chamber (31) away from the exhaust pipe (100) is provided with an exhaust port (310) that communicates with the exhaust hole (20). The diffuser (3) is provided with a third air outlet (303) on the side facing the inner cavity of the elevator car (2). The exhaust chamber (31) is provided with several negative pressure air inlets (311) for connecting to the third air outlet (303).

2. An elevator with an energy-saving fan for negative pressure ventilation branches according to claim 1, characterized in that: The horizontal plane of the negative pressure air inlet (311) is inclined, and the angle between the inclined plane of the negative pressure air inlet (311) and the airflow discharge direction of the exhaust chamber (31) is greater than 120°.

3. An elevator with an energy-saving fan for negative pressure ventilation branches according to claim 1, characterized in that: The inner wall of the elevator car (2) located at the exhaust hole (20) and the outer wall of the air diffuser (3) located at the exhaust port (310) form a tightly fitted sealed assembly structure.

4. An elevator with an energy-saving fan for negative pressure ventilation branches according to claim 1, characterized in that: The diffuser (3) is provided with a diffuser plate (32) on the side facing the inner cavity of the elevator car (2). The diffuser plate (32) covers the front end of the central cavity (30). The diffuser plate (32) has through holes (320) evenly distributed at equal intervals.

5. An elevator with an energy-saving fan for negative pressure ventilation branches according to claim 4, characterized in that: The central cavity (30) is provided with a filter element (33) for filtering airflow, and the end face structure of the filter element (33) is adapted to the end face structure of the diffuser plate (32).

6. An elevator with an energy-saving fan for negative pressure ventilation branches according to claim 1, characterized in that: The width of the housing (12) does not exceed the width of the elevator car (2).

7. An elevator with an energy-saving fan for a negative pressure ventilation branch as described in claim 6, characterized in that: The housing (12) is composed of four side plates (120) connected end to end and at least one cover plate (121). The cover plate (121) is provided with a hollow grid (123) corresponding to the high-speed fan (10) and the ventilation fan (11). A dustproof mesh cover (124) is embedded in the hollow grid (123).

8. An elevator with an energy-saving fan for negative pressure ventilation branches according to claim 1, characterized in that: The horizontal plane of the air diffuser (3) is parallel to the horizontal plane of the bottom plate of the elevator car (2), and a pipe cavity (4) is provided between the air diffuser (3) and the top plate of the elevator car (2). The exhaust pipe (100), the intake pipe (101) and the output pipe (110) are all located in the pipe cavity (4).

9. An elevator with an energy-saving fan for negative pressure ventilation branches according to claim 8, characterized in that: Sealing rings are provided at the points where the elevator car (2) in the pipe cavity (4) is penetrated by the exhaust pipe (100), the intake pipe (101) and the output pipe (110).

10. An elevator with an energy-saving fan for negative pressure ventilation branches according to claim 1, characterized in that: The elevator car (2) is also equipped with a control panel for controlling the high-speed fan (10) and the ventilation fan (11).

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