WO2017129730A1 - Braking mechanism comprising a pressure booster for an elevator system - Google Patents

Abstract

Braking device (1000) for an elevator system (10), comprising a braking mechanism (300) for decelerating a movement of a car (20) of the elevator system, and an actuation mechanism (200) designed to supply a first force for actuating or releasing the braking mechanism (300), the actuation mechanism (200) being equipped with a pneumatic-hydraulic pressure booster (100) for converting a pneumatic pressure into a hydraulic pressure to supply the first force.

Description

 Braking device with pressure booster for an elevator installation

description

The present invention relates to a braking device for an elevator installation, a car with such a braking device, and a method for operating a braking device for an elevator installation. State of the art

In elevator systems braking devices can be used as service brakes for

Braking a movement of a car, for example, be arranged on the drive or the traction sheave. However, in multi-car systems where multiple cars are moved in a manhole, the brakes are placed directly on the car to individually and independently decelerate the cars.

On the car arranged or entrained braking devices, however, must be much higher compared to drive or traction disc brakes

Develop braking forces whose production is complicated.

DISCLOSURE OF THE INVENTION According to the invention, a braking device for an elevator installation, a car with such a braking device and a method for operating a braking device for an elevator installation are proposed with the features of the independent patent claims. Advantageous embodiments are the subject of the dependent claims and the following description. In the context of the invention, a braking device for an elevator system is presented, in which a (in particular high) first force for actuating or releasing a brake mechanism, which is provided for braking a movement of a car of the elevator system, by using a pneumatic hydraulic pressure booster is provided ,

Although it is also possible to use a hydraulic system by means of which the braking mechanism can be actuated or released in order to be able to apply high braking forces, the disadvantage here is that high-pressure hydraulic components, in particular pumps and valves, are very large and heavy, and

In particular, valves for blocking or releasing the pressurized fluid have a high energy requirement.

The invention proposes the use of a pneumatic hydraulic pressure booster, so that the primary pressure can be pneumatically generated, which allows significantly smaller and lighter compressors or pumps and valves. A weight saving is particularly advantageous in an advantageous arrangement on the car, since the

Braking device must be moved with the car.

Another advantage is that instead of hydraulic valves pneumatic valves can be used, which also build smaller and have a lower energy consumption. For example, pneumatic valves can be used, which are about 1/25 of the power requirement of comparable

Have hydraulic valves. Because of security requirements in the

 Lifting the use of multiple redundant valves is necessary, this leads to a significant energy savings. The same applies to the weight.

Preferably, the brake device as a service brake, which on

Car, especially a multi-car elevator system, is arranged, used. Here, the weight, space and energy saving savings unfolds special advantages.

The first force can, as mentioned, actuate the brake mechanism or solve - according to the failsafe principle - against a biasing force. Preferably, the first force is for releasing the brake mechanism against one of a

Biasing means provided second force acting against the first force. In other words, the brake mechanism preferably operates according to the failsafe principle, wherein the braking force is provided as a second force from the biasing means, in particular from a spring, and the release force as a first force. The use of a braking device according to the invention is particularly advantageous for releasing the braking mechanism, since in this case very large forces are necessary (about twice the operating force), since in addition to loosening still a certain air gap, usually between a brake element (usually

Brake shoes or brake pad) and the guide rail must be achieved. When providing large forces, the advantages of the invention mentioned come especially to bear.

A preferred pneumatic-hydraulic pressure booster has a

Pneumatic pressure chamber and a hydraulic pressure chamber, which are connected by a differential piston. In this way, pressure amplification can be achieved very simply by dimensioning the pneumatic piston surface and the hydraulic piston surface. Preferably, the pneumatic piston area is at least ten times as large as the hydraulic piston area, i. of the

Hydraulic pressure is at least ten times greater than the pneumatic pressure.

Advantageously, at least one pneumatic valve is upstream of the

Pneumatic-hydraulic pressure intensifier, in particular upstream of the

Pneumatic pressure chamber, arranged. As mentioned, the use of

Pneumatic valves compared to hydraulic valves significant advantages. According to a preferred embodiment, upstream of the pneumatic hydraulic pressure intensifier, preferably upstream of the at least one pneumatic valve, a pneumatic source, such as a pneumatic connection or a compressor, is provided. Accordingly, therefore, a compressor may be part of the braking device, however, as well as the braking device may only have a connection for connecting a compressed air line, so that in particular a compressor can be used to power multiple braking devices. Preferably, the brake device has a hydraulic accumulator, which is arranged downstream of the pneumatic-hydraulic pressure booster, in particular downstream of the hydraulic pressure chamber. The hydraulic accumulator can preferably serve to leak quantities in the hydraulic system

compensate.

Preferably, there is a fluid connection of the hydraulic accumulator with the hydraulic pressure chamber when the differential piston in an unactuated

Position is. Unactuated position is understood in particular that the differential piston is not deflected by application of pneumatic pressure.

The hydraulic accumulator is expediently arranged on the pneumatic-hydraulic pressure transducer that the fluid connection between the

Hydraulic accumulator and the hydraulic pressure chamber can be interrupted by a movement of the differential piston. It is preferred that the fluid communication is interrupted when the differential piston is in an actuated position. Under actuated position is particularly understood that the differential piston is deflected by application of pneumatic pressure to actuate or release the brake mechanism. Such a separation of the hydraulic accumulator from the hydraulic pressure chamber is advantageously used to ensure that the pressure in the hydraulic accumulator is not raised to the high hydraulic pressure. Due to the high reliability and the high hydraulic pressure that can be provided by simple means, this braking device is also suitable for actuating the brake instead of releasing, which is otherwise the usual mode of operation.

Further advantages and embodiments of the invention will become apparent from the

Description and attached drawing.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention is based on an embodiment in the drawing

schematically and will be described below with reference to the

Drawing described.

figure description

Figure 1 shows a schematic sectional view of a preferred

 Embodiment of a pneumatic hydraulic pressure intensifier used in the context of the invention.

FIG. 2 shows a preferred embodiment of a device according to the invention

 Braking device, wherein the pneumatic-hydraulic pressure booster no pneumatic pressure is applied.

Figure 3 shows the braking device of Figure 2, wherein applied to the pneumatic-hydraulic pressure intensifier pneumatic pressure. FIG. 4 schematically shows a preferred embodiment of an elevator installation according to the invention.

Detailed description of the drawing

1 shows an embodiment of a pneumatic-hydraulic pressure booster suitable for the invention is shown in a schematic sectional view and designated 100. The pneumatic-hydraulic pressure booster 100 has a pneumatic pressure chamber a and a hydraulic pressure chamber b, which are connected by a differential piston 1. The differential piston 1 has a

 Pneumatic piston surface c and a hydraulic piston surface d on, takes place in response to these a pressure increase. A pressure boost is achieved here, since the pneumatic piston surface c is greater than the hydraulic piston surface d. A prevailing in the pneumatic pressure chamber a pneumatic pressure is accordingly in a larger in the hydraulic pressure chamber b

prevailing hydraulic pressure translated.

At the hydraulic pressure chamber b, a hydraulic accumulator 3 is arranged, which serves to compensate for leakage amounts of the hydraulic fluid. It can be seen that the fluid connection between the hydraulic accumulator 3 and the

 Hydraulic pressure chamber b as a function of the position of the differential piston 1 is or does not exist. In particular, there is fluid communication when the differential piston 1 is in the left (unactuated) position against the stop, and the fluid connection does not exist as soon as the differential piston 1 is displaced from the unactuated position to an actuated position by a certain length.

In practice, the hydraulic pressure chamber b will be connected via hydraulic lines to a hydraulic actuator, for example a movable actuator piston 2. In the schematic view, however, the hydraulic line is not shown, but the actuator piston 2 is for better illustration also shown in the hydraulic pressure chamber b. From the ratio of

Hydraulic piston surface d of the differential piston 1 to the hydraulic piston surface f of the actuator piston 2, if desired, a further pressure boost can be achieved. In any case, a movement e of the differential piston 1 leads to a movement g of the actuator piston 2, which movement is used to actuate or release a brake mechanism, as shown in FIGS. 2 and 3.

2 shows a preferred embodiment of a braking device according to the invention is shown in a schematic sectional view and designated 1000.

The brake device 1000 has a brake mechanism 300 and an actuating mechanism 200. The actuating mechanism 200, in turn, has the pneumatic-hydraulic pressure booster 100 according to FIG. 1, a situation being shown in which no pneumatic pressure is present at the pneumatic-hydraulic pressure booster.

The pneumatic pressure chamber a of the pneumatic-hydraulic pressure intensifier 100 is connected to a number of pneumatic valves 40 with a pneumatic pressure source designed as a compressor 60 and with an outlet i, e.g. Environment, in connection. Thus, the pneumatic pressure chamber a by opening and

Close the pneumatic valves 40 are pressurized or vented. An outflow of compressed air from the pneumatic pressure chamber a is at

corresponding valve position in the direction i possible.

The hydraulic pressure chamber b is connected via a hydraulic line j, which is designed here as a bore in a solid material, with the actuator piston 2 in conjunction, which is pressed by a trained as a spring 5 biasing means in a direction h. If the pneumatic pressure chamber a is pressurized, this leads to a movement of the differential piston 1 in the figure to the right, at the same time in the hydraulic pressure chamber b, a very high pressure is generated. This very high pressure is again translated in the figure, guided on the actuator piston 2, so that it moves against the second force provided by the spring 5 in the figure to the left. By a corresponding coupling with the

Brake mechanism 300 can be opened or closed in this way, a car brake. In Figure 2, the unactuated position is shown in which there is a fluid connection between the high-pressure accumulator 3 and the hydraulic system. In this position, fluid can flow from the reservoir 3 into the hydraulic pressure chamber b in order to compensate for leakage quantities. In Figure 3, an actuated position is shown in which no fluid connection between the

High-pressure accumulator 3 and the hydraulic system is made, so that the high

Hydraulic pressure is not in the pressure accumulator 3 prevails.

FIG. 4 schematically shows an elevator installation 10 with a preferred one

Embodiment of a car 20 according to the invention shown, on which a preferred embodiment of a brake device 1000 according to the invention is arranged. The elevator installation 10 is designed, in particular, as a multicar elevator installation with a large number of cars 20.

The brake mechanism 300 of the brake device 1000 has two

Bremselemente 310, 320, between which a guide rail 30 of the

Elevator system 10 can be clamped to decelerate a movement of the car 20.

In the embodiment shown, the brake is designed according to the failsafe principle, wherein the brake elements 310, 320 by the second force of the spring fifth getting closed. In particular, during a power failure, the brake is thus closed.

To open the brake, the pneumatic pressure chamber a is pressurized, in particular by means of compressed air, so that the differential piston 1 moves in the figure to the right, causing the actuator piston 2 moves against the second force provided by the spring 5 in the figure to the left and the brake elements 310, 320 opens and so movement of the car 20 relative to

Guide rail 30 releases.

Claims

claims 1. Braking device (1000) for an elevator installation (10), with a A brake mechanism (300) for slowing down movement of a car (20) of the elevator system and comprising an actuating mechanism (200) adapted to provide a first force for actuating or releasing the brake mechanism (300), the actuating mechanism (200) being a pneumatic - Hydraulic pressure booster (100) has to translate a pneumatic pressure into a hydraulic pressure to provide the first force. 2. Braking device (1000) according to claim 1, wherein the pneumatic hydraulic pressure intensifier (100) has a pneumatic pressure chamber (a) and a hydraulic pressure chamber (b), which are connected by a differential piston (1). 3. Braking device (1000) according to claim 2, wherein a pneumatic piston surface (c) of the differential piston (1) is at least twice as large as a hydraulic piston surface (d) of the differential piston (1). 4. Braking device (1000) according to one of the preceding claims, with at least one pneumatic valve (40), which is arranged upstream of the pneumatic hydraulic pressure booster (100). 5. Brake device (1000) according to any one of the preceding claims, with a pneumatic source (60) which is arranged upstream of the pneumatic-hydraulic pressure booster (100). 6. Braking device (1000) according to any one of the preceding claims, with a hydraulic accumulator (3), which downstream of the pneumatic-hydraulic pressure booster (100) is arranged. 7. Braking device (1000) according to claim 6 in back reference at least to claim 2, wherein the hydraulic accumulator (3) with the hydraulic pressure chamber (b) is in fluid communication, wherein the fluid connection can be interrupted by a movement of the differential piston (1). 8. Brake device (1000) according to claim 7, wherein the fluid connection of the hydraulic accumulator (3) with the hydraulic pressure chamber (b) is interrupted when the differential piston (1) is in an actuated position. 9. Braking device (1000) according to claim 7 or 8, wherein the Fluid communication of the hydraulic accumulator (3) with the hydraulic pressure chamber (b) is when the differential piston (1) is in an unactuated position. 10. Braking device (1000) according to one of the preceding claims, comprising a biasing means (5) for providing a second force, which counteracts the first force. 11. car (20) with a braking device (1000) according to any one of the preceding claims. 12. A method for operating a brake device (1000), in particular a brake device according to one of Anprüche 1 to 11, for a Elevator installation, comprising a braking mechanism (300) for braking a movement of a car (20) of an elevator installation (10), wherein Pneumatic pressure is generated and translated into a hydraulic pressure to a first force for actuating or releasing the brake mechanism (300) provide. 13. The method of claim 12, wherein a braking device (1000) is operated according to one of claims 1 to 10. 14. The method according to any one of claims 12 or 13, wherein on the basis of the first force of the brake mechanism is actuated.