Machine-room-less elevators are relative to elevators in organic rooms, that is, using modern production technology to miniaturize the equipment in the equipment room as far as possible while maintaining the original performance, eliminating the need for a computer room and the control cabinet in the original engine room. Traction machines, speed limiters, etc. are moved to the top of the hoistway or to the side of the hoistway, thereby eliminating the traditional machine room. In order to meet the customer's special requirements for height and roof.
First, the advantages of machine-roomless elevators and organic room elevators
1. The advantage of a machine-room-less room is to save space. You can only make a maintenance platform under the host.
2. Since there is no need for a computer room, there is a greater benefit to the structure and cost of the building. This allows the architects to have greater flexibility and convenience in design, giving the designer more freedom and eliminating the need for In the engine room, for the owner, the cost of building a machine-room-less elevator is lower than that of an organic room elevator.
3. Due to the particularity of the overall design of some antique building buildings and the requirements for the roof, the elevator problem must be solved within an effective height. Therefore, the machine-roomless elevator is very suitable for such building needs. In addition, in the places with scenic spots, due to the room The height of the floors destroys the local ethnicity of the country. If a machine roomless elevator is used, it is not necessary to set up the main room of the elevator separately, which can effectively reduce the height of the building.
4. It is inconvenient to set up places for elevators, such as hotels, hotel annexes, and podiums.
Second, the shortcomings of machine roomless elevators and organic room elevators
1, noise, vibration and use limitations
There are two kinds of host placement methods for machine-room-less housing: one is that the host is placed on the top of the car, and the guide wheel is connected through the shaft. No matter which of the above methods is used, the impact of noise is very large because of the use of steel connection. , And the noise must be digested in the well, plus the sound of the brake, the fan's voice will be amplified. Therefore, in terms of noise, the machine-room-less room is significantly larger than the organic room. In addition, due to the rigid connection of the main unit, the resonance phenomenon is inevitably transmitted to the car and the guide rail, and the influence on the car and the guide rail is relatively large. Therefore, the comfort of the machine room is significantly weaker than that of the organic room. Due to the impact of these two items, the elevator without machine room is not suitable for high speed trapezoids above 1.75/s. In addition, due to the limited supporting force of the shaft wall, the load-bearing capacity of the machine-roomless elevator is generally not more than 1150 kg. Excessive loading capacity imposes excessive load on the shaft wall, and we usually have a reinforced concrete thickness of 200 mm. Usually 240mm, not suitable for carrying too large, so in the 1.75m / s, 1150 kg below the trapezoidal machine room can replace the organic room, and large-capacity high-speed elevators, organic room elevator is significantly better than machine-roomless elevator.
2, the temperature effect
The calorific value of the elevator is relatively large. At the same time, its various electronic components are relatively poor in the ability to withstand high temperatures, and now the organic elevators and machine-room-less elevators that are used both employ permanent magnet synchronous gearless traction machines, and their permanent magnet synchronous motors The temperature should not be too high, otherwise it is easy to cause "magnetism" phenomenon. Therefore, now the national standard has a clear stipulation on the temperature and exhaust capacity of the engine room. The main heat-generating components such as the machine room of the machine-room are all in the shaft. Because there is no corresponding cooling and exhausting facilities, the temperature of the elevator without machine room has a great influence on the host and the control cabinet. In particular, the transparent sightseeing ladder is not suitable for installation. In a machine-room-less elevator, the hot air gathered in the elevator cannot be discharged. Therefore, we must pay attention to the selection of such elevators.
3, fault repair and personnel rescue
Roomless elevator maintenance and management is not as convenient as organic elevators. Machine-room-less elevator repair and debugging is too much trouble, because even the best elevator is also difficult to avoid failure, and machine-roomless elevator because the host is installed on the beam, the host in the well, if the host (motor) problem is very troublesome, so The national standards expressly stipulate that the elevator window of the organic house may not need to be added, but the machine room must be added to facilitate the convenience and safety of the rescue and overhaul and maintenance of the main engine. Therefore, the elevator of the organic room occupies an absolute advantage in terms of maintenance. If there is space, It is recommended to use organic rooms. In addition, in the aspect of personnel rescue, the elevator without machine room is also very troublesome. In the event of a power outage, emergency power must be installed. Generally, the elevator emergency power supply requires more funds.