WO2008065706A1

WO2008065706A1 - Buffer of elevator

Info

Publication number: WO2008065706A1
Application number: PCT/JP2006/323644
Authority: WO
Inventors: Mitsuyoshi Imura
Original assignee: Mitsubishi Electric Corporation
Priority date: 2006-11-28
Filing date: 2006-11-28
Publication date: 2008-06-05
Also published as: CN101541659B; KR100975189B1; EP2088111A4; EP2088111A1; KR20090060349A; JPWO2008065706A1; CN101541659A

Abstract

A buffer for an elevator in which the overall height dimension of the buffer can be reduced while the equivalent stroke is ensured, the cost can be reduced by reducing the overall height of the buffer, and assembling performance and installation performance can be enhanced. In the buffer for an elevator comprising a base cylinder and a plurality of stages of plunger where each plunger is provided with a coil spring for resetting each compressed plunger to an elongated state before compression, the coil spring for resetting the plunger entering the base cylinder has a large diameter, and it is arranged between the upper portion of the plunger and the upper portion of the base cylinder on the outside of the plunger. Another coil spring for resetting the plunger on the upper stage entering the plunger on the lower stage has a small diameter, and it is arranged between the lower portion of the plunger on the upper stage and the bottom portion of the plunger on the lower stage on the inside thereof. In an elongated state of each plunger, the other small diameter coil spring for resetting is arranged on the inside of the large diameter coil spring for resetting.

Description

Specification

Elevator shock absorber Technical Field

[0001] This invention is arranged at the bottom of the hoistway pit, and when an elevator force or counterweight goes down the lowermost floor due to some abnormal cause and descends to the hoistway pit, the impact is reduced and the safety is ensured. The present invention relates to an elevator shock absorber to be stopped.

Background art

[0002] An elevator shock absorber is a safety device that reduces the impact and stops safely when the elevator car or counterweight goes down the lower floor for some reason and descends to the hoistway pit. It is.

Conventionally, as this kind of shock absorber, there is an orifice-control rod type hydraulic shock absorber. The stroke of this hydraulic shock absorber is defined by the rated speed of the elevator (stroke = (rated speed XI. 15) ² Z2Z9.80665), and the plunger axial length must be longer than that stroke. In addition, since the cylinder is also required to accept the ingress of the plunger, the axial length almost corresponding to the length of the plunger is required, and the configuration is long in the axial direction. Thus, when the overall length of the device becomes longer, the floor of the hoistway has to be deepened accordingly, and there is a problem that the construction cost of the hoistway increases. Also, the overall height of the equipment was long, making it difficult to assemble and transport to the site.

[0003] Therefore, it is effective to apply a multi-stage hydraulic shock absorber that can reduce the overall height while securing the stroke by configuring the plunger as shown in Fig. 4 in multiple stages for the hydraulic shock absorber of the ultra-high speed elevator. It is. A multi-stage hydraulic shock absorber is composed of a base cylinder filled with hydraulic oil and a multi-stage plunger that enters the base cylinder and is sequentially formed in a small diameter and configured to expand and contract in the axial direction. When the plunger enters the base cylinder or the lower-stage plunger, a hydraulic shock absorber configured to generate a buffer function due to a pressure difference caused by the movement of hydraulic oil causes at least two or more stages of the plunger to move to the base cylinder or In addition to entering the lower plungers simultaneously, the fluid resistance changes with the penetration depth for each of the at least two or more plungers. As a method for returning the plunger after compression of the stage shock absorber, a return coil spring is arranged in each stage (see, for example, Patent Document 1).

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-324879

Disclosure of the invention

Problems to be solved by the invention

[0005] However, in the ultra-high speed region where multi-stage hydraulic shock absorbers are applied, the plunger and the stroke of each stage are as large as several meters even though the plunger is configured in multiple stages. The contact height of the spring increases. In addition, the height of the return coil spring after the shock absorber operation (after compression) must naturally be equal to or greater than the contact height, and the length of the plunger has increased accordingly. As a result, the overall height of the shock absorber is increased, and the merit of using a multi-stage system can be maximized.

[0006] The present invention has been made to solve the above-described problems, and it is possible to reduce the overall height of the shock absorber while ensuring an equivalent stroke, thereby reducing the total height of the shock absorber. It is possible to provide an elevator shock absorber that can reduce assembly and improve assembly and installation.

Means for solving the problem

[0007] In the elevator shock absorber according to the present invention, a base cylinder filled with hydraulic oil, and a plurality of stages that enter the base cylinder and are sequentially formed in a small diameter and extendable in the axial direction. When the plunger of each stage enters the base cylinder or the plunger of the lower stage, it is configured to generate a buffer function due to the pressure difference accompanying the movement of the hydraulic oil, and is arranged at the bottom of the hoistway pit. At least two or more stages of plungers enter the base cylinder or lower plunger at the same time, and at least two or more stages of plungers are configured to change the! / ヽ fluid resistance with the depth of entry. In addition, each plunger is provided with a return coil spring that returns each compressed plunger to an expanded state before compression. The return coil spring that returns the plunger that enters the base cylinder has a large diameter and is disposed outside the plunger and between the upper part of the plunger and the upper part of the base cylinder. The return coil spring that returns the penetrating upper plunger has a small diameter and the lower bra Inside the plunger and between the lower part of the upper plunger and the bottom part of the lower plunger. When each plunger is extended, the smaller return coil spring is located inside the larger return coil spring. Are arranged.

The invention's effect

[0008] According to the present invention, it is possible to obtain a multistage hydraulic shock absorber capable of shortening the height of the entire shock absorber while ensuring an equivalent stroke. In addition, shortening the overall height of the shock absorber can reduce costs and improve assembly and installation. Further, since the floor of the hoistway can be made shallower than the conventional one, the construction cost of the hoistway can be reduced.

Brief Description of Drawings

FIG. 1 is a cross-sectional configuration diagram showing a state when an elevator shock absorber according to Embodiment 1 of the present invention is extended.

[Fig. 2] Fig. 2 is a cross-sectional configuration diagram showing a state during compression of the elevator shock absorber in Embodiment 1 of the present invention.

[Fig. 3] Fig. 3 is a comparative view showing the dimensional relationship between the extension and compression of the elevator shock absorber in Embodiment 1 of the present invention.

Explanation of symbols

[0010] 1 Base cylinder

2 First plunger

3 Second plunger

4 Cushion material

5 First return coil spring

6 Second return coil spring

8 Bottom plate

11 First control cylinder

12 First orifice group

13 Base cylinder wall

14a 1st oil chamber

14b Second oil chamber 16 Space

17 Piston

18 Air holes

20 First sliding member

21 Second control cylinder

22 Second orifice group

23 Outer wall of first plunger

24 Oil chamber

25 Oil passage

30 Second sliding member

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] In order to describe the present invention in more detail, it will be described with reference to the accompanying drawings.

Example 1

FIG. 1 is a cross-sectional configuration diagram showing a state when the elevator shock absorber according to the first embodiment of the present invention is extended, and FIG. 2 shows a state when the elevator shock absorber according to the first embodiment of the present invention is compressed. FIG.

[0013] In the figure, the shock absorber is fitted into a base cylinder 1 filled with hydraulic oil and a first control cylinder 11 provided inside the base cylinder 1, and slides into the first cylinder. The plunger 2 and the second plunger 3 are fitted into a second control cylinder 21 provided inside the first plunger 2 and are slid to enter. The first control cylinder 11 is provided with a plurality of first orifice groups 12 as appropriate in the cylinder axial direction. The second control cylinder 21 is provided with a plurality of second orifice groups 22 as appropriate in the cylinder axial direction. A cushion member 4 is provided on the top of the second plunger 3 in order to prevent the metal from contacting each other between the elevator and the lifting body such as a counterweight and the plunger. An oil chamber 24 is formed between the second control cylinder 21 and the outer peripheral wall 23 of the first plunger 2. An oil passage 25 is provided at the bottom of the first plunger 2 to allow the oil chamber 24 and the base cylinder 1 to communicate with each other. Further, a second sliding member 30 is provided at the lower part of the outer peripheral portion of the second plunger 3, and the second plunger 3 The inner wall of the second control cylinder 21 slides while maintaining oil tightness and enters the first plunger 2. The hydraulic oil in the first plunger 2 pressurized by the second plunger 3 is depressurized by passing through the second orifice group 22 and guided to the oil passage 25 via the oil chamber 24. A first sliding member 20 is provided at the lower part of the outer periphery of the first plunger 2, and the first plunger 2 slides on the inner wall of the first control cylinder 11 while maintaining oil tightness in the base cylinder 1. enter in . The hydraulic oil in the base cylinder 1 pressurized by the first plunger 2 is depressurized by passing through the first orifice group 12, and the first oil chamber 14a and the second oil chamber formed outside the first control cylinder 11 are used. Guided to oil chamber 14b. The first oil chamber 14a is provided on the outer periphery of the first control cylinder 11, and the second oil chamber 14b is provided outside the first oil chamber 14a. A base cylinder wall 13 is provided between the first oil chamber 14a and the second oil chamber 14b, and the second oil chamber 14b provided in the outermost wall is an oil passage 15 provided in the lower portion of the base cylinder wall 13. Communicates with the first oil chamber 14a. The height of the first oil chamber 14a and the second oil chamber 14b is configured to be lower than the height when the plungers 2 and 3 are fully compressed. A piston 17 that slides along the inner wall is provided in the second oil chamber 14b, and the piston 17 seals the hydraulic oil in the second oil chamber 14b and serves as a hydraulic oil for the entire hydraulic shock absorber. It has a weight sufficient to apply a predetermined pressure and hold a predetermined oil level. As a result, the second oil chamber 14b is the same height as the first oil chamber 14a, and is configured to be lower than the height when the plungers 2 and 3 are fully compressed. A space 16 is formed. The hydraulic oil guided from the first oil chamber 14a to the second oil chamber 14b via the oil passage 15 pushes up the piston 17 to the space 16 and is stored in the second oil chamber 14b. An air hole 18 is formed at the top of the second oil chamber 14b so that the downward pressure applied to the piston does not fluctuate when the piston 17 is moved up and down.

[0014] The first plunger 2 and the second plunger 3 include a first return coil spring 5 and a second return coil spring for returning the compressed plungers 2 and 3 to the expanded state before compression. 6 are provided separately. The weights of the structural members constituting the plungers 2 and 3 are supported by the first return coil spring 5 and the second return coil spring 6.

[0015] The first return coil spring 5 for returning the first plunger 2 to the expanded state before compression has a large diameter, is outside the outer peripheral wall 23 of the first plunger 2, and is at the upper end of the first plunger 2. It is arranged between the flange and the upper surface of the upper end of the base cylinder 1. Also, the second plunger 3 The second return coil spring 6 for returning to the stretched state before compression has a smaller diameter than the first return coil spring 5 and is provided in the second control cylinder 21 provided inside the first plunger 2 and 2 Located between the lower surface of the bottom plate 8 of the plunger 3 and the upper surface of the bottom of the first plunger 2. In the extended state of the first plunger 2 and the second plunger 3, as shown in FIG. 1, the second return coil spring 6 having a small diameter is arranged inside the first return coil spring 5 having a large diameter. .

Next, the buffering operation will be described.

As shown in Fig. 1, the hydraulic shock absorber when there is no load is the space below the second oil chamber 14b partitioned by the piston 17, the first oil chamber 14a, the first control cylinder 11, the oil chamber 24, and the second oil chamber 14b. 2 The inside of the control cylinder 2 1 is filled with hydraulic oil. When the elevator car (or counterbalance weight) collides with the hydraulic shock absorber due to some abnormality, the second plunger 3 moves down in the second control cylinder 21 of the first plunger 2. At this time, since the space surrounded by the first control cylinder 21 and the second plunger 3 is sealed except for the second orifice group 22, the hydraulic oil inside the second control cylinder 21 is pressurized, Support the second plunger 3 upward, and push the first plunger 2 downward while applying deceleration force to the elevator car. The hydraulic oil is ejected from the opening of the second orifice group 22 into the oil chamber 24 by the volume of the second plunger 3 entering the second control cylinder 21, and the pressure is reduced by the fluid resistance. As the second plunger 3 descends, the total opening area of the second orifice group 22 provided in the second control cylinder 21 decreases, and the fluid resistance gradually increases. The oil chamber 24 is connected to the space in the first control cylinder 11 through the oil passage 25. Since the opening area of the oil passage 25 is larger than the opening area of the second orifice group 22, the pressures in the oil chamber 24 and the first control cylinder 11 are substantially equal. The first plunger 2 is pushed downward by the pressure inside the second control cylinder 21. At this time, hydraulic oil also flows into the first control cylinder 11 from the oil passage 25, and the inside of the first control cylinder 11 The hydraulic oil is pressurized and generates a force in the direction of supporting the first plunger 2 upward. In this state, the pressure inside the second control cylinder 21 is higher than the pressure inside the oil chamber 24 and the first control cylinder 11, so that the first plunger 2 that does not flow back to the inside of the second control cylinder 21 1 From the opening of the first orifice group 12 to the first oil chamber 14a, only the volume of the fluid that has entered the control cylinder 11 and the volume of hydraulic fluid that has passed through the oil passage 25 and has flowed into the first control cylinder 11 are used. hydraulic oil Erupts. The hydraulic oil that also spouts the opening force of the first orifice group 12 is depressurized by the fluid resistance, and is depressurized by the mass of the piston 17 to a pressure that is always applied to the hydraulic oil in the oil chamber 14a. In this case as well, the total opening area of the first orifice group 12 provided in the first control cylinder 11 decreases as the first plunger 2 descends, and the fluid resistance increases. The first oil chamber 14a is connected to the second oil chamber 14b through the oil passage 15, and since the first oil chamber 14a is already filled with the hydraulic oil, the ejected hydraulic oil is used as the piston 17 in the second oil chamber 14b. Push up. Since the opening area of the oil passage 15 is larger than the opening area of the first orifice group 12, the pressure of the hydraulic oil in the first oil chamber 14a and the second oil chamber 14b is substantially equal. This pressure is always kept at the same level as the sum of the pressure due to the piston load and the atmospheric pressure if the sliding resistance of the piston 17 is ignored. This pressure level is lower than the pressure in the second control cylinder 21 and the first control cylinder 11 when a large load is applied to the hydraulic shock absorber as in the buffering operation. The hydraulic oil in the chamber 14a and the second oil chamber 14b is no longer involved in the deceleration performance. Since the series of operations described above are changes accompanying pressure changes, they are actually realized at the same time.

Next, the return operation will be described.

When the load placed on the second plunger 3 is removed from the state where the hydraulic shock absorber is fully compressed (Fig. 2), the movable parts such as the first plunger 2 and the second plunger 3 are moved to the return coil springs 5 and 6. It gradually expands due to the function and the flow of hydraulic oil described below, and eventually returns to its original state. At this time, the hydraulic oil stored in the second oil chamber 14b is pushed in by the mass of the piston 17, and flows in the opposite direction to that during the buffering operation, so that the first oil chamber 14a and the first control are supplied from the oil passage 15. Each space is gradually filled through the first orifice group 12 of the cylinder 11, the oil passage 25, the oil chamber 24, and the second orifice group 22 of the second control cylinder 21.

Next, the dimensional relationship between the hydraulic shock absorber according to the present invention and the conventional hydraulic shock absorber will be described with reference to FIGS. 3 and 4.

According to the structure of the hydraulic shock absorber of the present invention shown in FIG. 3, the total height when extended (FIG. 3a) is 1000 Omm, the total height when compressed (FIG. 3b) is 4000 mm, and the stroke from the extended state to the compressed state is 60 OOmm. The compression height of the first return coil spring 5 is 1000 mm, and the compression height of the second return coil spring 6 is 1000 mm. On the other hand, according to the structure of the conventional hydraulic shock absorber shown in Fig. 4, the total height when stretched (Fig. 4a) is 10 500mm, the total height when compressed (Fig. 4b) is 4500mm, and the stroke from stretched to compressed is 6000mm Therefore, the compression height of the first return coil spring is 1000 mm, and the compression height of the second return coil spring is 1000 mm.

Accordingly, the first return coil spring 5 for returning the first plunger 2 to the extended state before compression is provided outside the outer peripheral wall 23 of the first plunger 2 and the upper end flange of the first plunger 2 and the base. A second return coil spring 6 is provided on the inner side of the first plunger 2 to be disposed between the upper surface of the upper end of the cylinder 1 and for returning the second plunger 3 to the expanded state before compression. By placing it in the 2nd control cylinder 21 and between the bottom surface of the bottom plate 8 of the 2nd plunger 3 and the bottom surface of the 1st plunger 2, the stroke until compression is equal to 6000mm. Although the compression lengths of the first return coil spring 5 and the second return coil spring 6 are equal to 1000 mm, the total height of the shock absorber is the same as the first return coil spring 5 and the second return coil spring 5 Coil spring 6 compression height (1000mm) 1Z2 500mm small short It can be seen that is. That is, according to the present invention, although the lengths of the base cylinder 1, the first plunger 2, and the second plunger 3 are different, the total height of the shock absorber is set to the first return coil spring while ensuring the same stroke as the conventional one. 5 and the compression height of the second return coil spring 6 can be shortened by about 1Z2.

[0019] Thereby, the cost of the shock absorber can be reduced by shortening the total height of the shock absorber, and the assembling property and the installation property are improved. Furthermore, since the floor of the hoistway can be made shallower than before, the construction cost of the hoistway can be reduced. Industrial applicability

[0020] As described above, the elevator shock absorber according to the present invention is disposed at the bottom of the hoistway pit, and the elevator force or counterweight passes over the lowest floor due to some abnormal cause, and the hoistway pit part It can be applied to a multi-stage hydraulic shock absorber to reduce the shock and stop safely when descending.

Claims

The scope of the claims

[1] It consists of a base cylinder filled with hydraulic oil, and a multi-stage plunger that enters the base cylinder and is formed into small diameters and expands and contracts in the axial direction. When entering the base cylinder or the lower plunger, it is configured to generate a buffering function due to the pressure difference accompanying the movement of hydraulic oil, and is arranged at the bottom of the hoistway pit. While entering the base cylinder or the lower stage plunger, each of the plungers is configured such that the fluid resistance changes with the depth of entry for the entry of the at least two or more stages of plungers. And an elevator shock absorber provided with a return coil spring for returning each compressed plunger to the extended state before compression, and

The return coil spring for returning the plunger entering the base cylinder has a large diameter, and is disposed outside the plunger and between the upper portion of the plunger and the upper portion of the base cylinder.

The return coil spring for returning the upper plunger that enters the lower plunger has a small diameter and is disposed inside the lower plunger and between the lower portion of the upper plunger and the bottom portion of the lower plunger.

The elevator shock absorber, wherein the small-diameter return coil spring is disposed inside the large-diameter return coil spring in an extended state of each plunger.

[2] The base cylinder has a plurality of orifices and is provided on the outside of the control cylinder to be fitted with the upper plunger, and the height is lower than the full compression of each plunger. The elevator shock absorber according to claim 1, further comprising a configured oil chamber.

[3] Of the plungers of each stage except the uppermost stage, at least one plunger has a plurality of orifices and is fitted with the upper plunger, and an oil chamber provided outside the control cylinder. 3. An elevator shock absorber according to claim 2, further comprising an oil passage for communicating the oil chamber with a base cylinder or a lower plunger.

[4] A return coil spring for returning the upper plunger that enters the lower plunger is placed in the control cylinder that fits with the upper plunger provided inside the lower plunger. 4. The elevator shock absorber according to claim 3, wherein the elevator shock absorber is disposed.