Advantages and disadvantages of machine room-less elevator and machine room elevator

The machine room-less elevator is relative to the machine room elevator, that is to say, the equipment in the machine room is miniaturized as much as possible while maintaining the original performance by using modern production technology, eliminating the machine room, and replacing the control cabinet, The traction machine, speed limiter, etc. are moved to the top of the elevator hoistway or the side of the hoistway, thereby eliminating the traditional machine room.

一. The advantages of elevator without machine room compared with elevator with machine room

1. The advantage of the machine room is that it saves space and can only be built as an overhaul platform under the host.

2. Since there is no need for a computer room, it has greater benefits to the building structure and cost, which allows architects to have greater flexibility and convenience in design, and gives designers greater freedom. At the same time, due to the cancellation For the machine room, for the owner, the construction cost of the machine room-less elevator is lower than that of the machine 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, so the machine roomless elevator meets the needs of this type of building. In addition, in places with scenic spots, because the machine room is in High floors, thereby destroying the local ethnic exoticism, if the machine room-less elevator is used, because there is no need to set up a separate elevator main room, the height of the building can be effectively reduced.

4.Places where it is inconvenient to set up elevator machine rooms, such as hotels, hotel annex buildings, podiums, etc.

二. The disadvantages of elevator without machine room compared with elevator with machine room

1. Noise, vibration and limitations of use
There are two popular ways to place the host of the machine roomless: one is that the host is placed on the top of the car and connected by the guide wheels in the hoistway. No matter which method is used, the noise impact is very large, because the rigid connection is adopted. And the noise must be digested in the shaft, plus the sound of the brake, the sound of the fan will be amplified. Therefore, in terms of noise, the machine room is obviously larger than the machine room.
In addition, the rigid connection of the main engine, the resonance phenomenon will inevitably be transmitted to the car and the guide rail, which has a greater impact on the car and the guide rail. Therefore, the comfort of the machine room is obviously weaker than that of the machine room. Due to the influence of these two items, the machine-room-less elevator is not suitable for high-speed trapezoids above 1.75/s. In addition, due to the limited supporting force of the hoistway wall, the load capacity of the machine room-less elevator should not be greater than 1150 kg. Excessive load capacity requires too much load on the hoistway wall, and we usually have a thickness of 200mm for reinforced concrete, brick-concrete structure Usually 240mm, it is not suitable for too large load, so the ladder-shaped machine room below 1.75m/s, 1150 kg can replace the machine room, and the high-speed elevator with large capacity, the machine room elevator is obviously better than the machine room elevator.

2. Temperature influence
The heat of the elevator is relatively large, and at the same time, its various electronic components are relatively poor in withstanding high temperature. Moreover, the machine room elevators and machine room elevators used now use permanent magnet synchronous gearless traction machines. The temperature should not be too high, otherwise it is easy to cause "loss of magnetism" phenomenon. Therefore, the current national standard has clear regulations on the temperature and exhaust air volume of the computer room. The main heating components such as the machine room of the machine room are all in the hoistway. Due to the lack of corresponding cooling and exhaust facilities, the temperature of the machine room-less elevator has a greater impact on the machine machine and control cabinet, especially the fully transparent sightseeing elevator is not suitable for installation. In the machine room-less elevator, the heat accumulated in the elevator cannot be discharged. Therefore, we must be careful when choosing this type of elevator.

3. Fault maintenance and personnel rescue
The maintenance and management of machine-room-less elevators is not as convenient as machine-room elevators. The maintenance and debugging of the machine roomless elevator is troublesome, because no matter how good the elevator is, it is inevitable that the failure will occur, and the machine roomless elevator is because the host is installed on the beam, and the host is in the hoistway. It is very troublesome if the host (motor) has a problem , The national standard expressly stipulates that the elevator safety window of the machine room can not be added, and the machine room must be added to facilitate the rescue and repair, and the convenience and safety of the maintenance of the host. Therefore, the elevator with the machine room has an absolute advantage in terms of maintenance. It is recommended to use the machine room.
In addition, in terms of personnel rescue, the machine room-less elevator is also very troublesome. In the event of a power failure, emergency power must be installed. Generally, the emergency power supply of the elevator requires a relatively large investment. The machine room elevator can be manually cranked in the machine room and directly released. After turning the car to the leveling area, people are released, and most of the machine roomless use battery release or manual cable release device, but this device can only be used to release the brake, and the up and down movement depends on the weight difference between the car and the counterweight. To make the car go up or down, and when the difference between the weight of the car and the weight of the car and the counterweight is very small, not only the brakes must be released but also the balance must be artificially destroyed. Usually, maintenance personnel are used to enter the upper floor door to enter the car. It is necessary to increase the weigt and make the elevator move to a level floor. There are certain risks in this treatment, and it must be handled by professionals. Through the above comparative analysis, the machine-room-less elevator and the machine-room elevator are the same in use, and the safety performance is also the same, but the advantages and disadvantages of each are different. The owner can choose the machine-room-less elevator or the machine-room elevator according to actual needs.

Post time: Jun-30-2021