JPH058968A - Fluid pressure elevator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] An object of the present invention is to reduce the driving power of a fluid pressure elevator to reduce the capacity of a power supply facility, and to reduce the size of a fluid pressure control device to enable efficient use of a building. To provide. [Composition] A fluid pressure cylinder 1 for driving a car 7,
An energy storage device 20 capable of storing energy substantially balanced with energy under a load state corresponding to half the rated load of an elevator, and a flow rate control of a working fluid between the fluid pressure cylinder 1 and the energy storage device 20. The car 7 is characterized in that the car 7 is moved by the fluid pressure pump 12 via the control valves 13 and 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure elevator, and supplies the speed of a car driven directly or indirectly by the fluid pressure cylinder to the fluid pressure cylinder or discharges it from the fluid pressure cylinder. The present invention relates to a fluid pressure elevator of a type that raises or lowers the car by controlling the flow rate of the pressure fluid.

[0002]

2. Description of the Related Art When a car is lifted, a fluid pressure pump generates a sufficient fluid pressure to support the weight of the car including a load, and the flow rate of a high-pressure fluid is directly controlled by a flow control valve. Alternatively, the pump is supplied to the fluid pressure cylinder while controlling the rotation speed of the pump to raise the car. When the car is lowered, the flow rate of the high-pressure fluid is directly controlled by the flow control valve, or the car is lowered by discharging it from the fluid pressure cylinder while controlling the rotational speed of the pump.

As such a conventional technique, for example, Japanese Patent Laid-Open No. 57-81073 has a flow rate control device for restricting the discharge amount of pressure oil when the descending speed of a car exceeds a predetermined value. Therefore, a technique for preventing an accident caused by a high speed descent is disclosed. Also, Japanese Patent Laid-Open No. 64-2
In Japanese Patent Publication No. 982, the speed of a hydraulic elevator drive motor is controlled by an inverter control power source, the starting current of the motor is limited when the car is raised to reduce voltage fluctuations, and the motor is rotated at a synchronous speed or higher when the car is lowered. There is disclosed a technique in which a shock is given to the hydraulic elevator during acceleration / deceleration by causing the shock to act as a generator.

[0004]

When raising the car, the fluid pressure generated by the pump is the total weight of the car including the load, and the energy for driving the fluid pressure pump is large. For this reason, the required power supply equipment or drive device becomes large. When lowering the car, the energy at the position of the car is directly converted into heat energy by the control valve and the motor and is discarded. Therefore, the temperature of the fluid may increase. In other words, the energy supplied when rising is converted to heat when falling and is discarded, resulting in a large energy loss.

The present invention has been made to solve the above-mentioned problems of the prior art. A first object of the present invention is to improve energy efficiency when driving a fluid pressure elevator and reduce driving power. To provide a fluid pressure elevator. A second object of the present invention is to provide a fluid pressure elevator which is a control valve having a simple structure and which is capable of downsizing the fluid pressure control device to reduce the installation area and improving the utilization efficiency of a building. .

[0006]

In order to achieve the above object, the structure of a fluid pressure elevator according to the present invention controls the flow rate of fluid supplied to the fluid pressure cylinder or discharged from the fluid pressure cylinder. An energy storage means for temporarily storing fluid pressure energy in a fluid pressure elevator for controlling the speed of a car directly or indirectly coupled to the top of the fluid pressure cylinder, the energy storage means and the fluid pressure. A fluid pressure control device between the cylinder and at least a fluid pressure pump and a fluid pressure control valve; and a fluid flow path connecting these fluid pressure cylinder, fluid pressure control device, and energy storage means. A fluid is reciprocated between the energy storage means and the fluid pressure cylinder by a pressure control device to expand and contract the fluid pressure cylinder, It raised Rikago, which is constituted so as to descend.

More specifically, the fluid pressure control device controls a motor whose speed is controlled by an inverter, a fluid pressure pump driven by the motor, and a fluid which is supplied to and discharged from the fluid pressure pump to a fluid pressure cylinder or energy storage means. And a tank for collecting the return fluid. In addition, the fluid pressure control valve is a main switching valve that controls the fluid from the fluid pressure pump, a pilot switching valve that drives the fluid, a relief valve that prevents abnormally high pressure, and the piping and pump to prevent negative pressure. It is composed of a suction valve for preventing it and a tank for collecting return fluid.

[0008]

The function and operation of the above technical means are as follows. In the present invention, the energy storage device and the fluid pressure cylinder are coupled via a fluid pressure pump or a fluid pressure control valve,
Control the fluid flow between the energy storage device and the hydraulic cylinder to control the car speed. That is, energy corresponding to the sum of the weight of the car and half the rated load is stored as fluid pressure in the energy storage device in advance. As a fluid pressure control valve for holding this energy, it is opened when the fluid pressure pump is operating (when the car is running) and closed when it is stopped to maintain the car position. A main switching valve that is fluid-pressure driven by a pilot switching valve is provided on each of the and the energy storage device side. This has the function of completely shutting off the fluid between the fluid pressure cylinder and the energy storage device.

According to the present invention, by using a fluid pressure control device having a control valve that controls the fluid flow rates of the fluid pressure cylinder and the energy storage device, and that opens during elevator operation and closes during normal stop, Energy can be exchanged and cut off between the pressure cylinder and the energy storage device. In addition, since the control valve has a simple structure, the fluid pressure control device becomes smaller and the amount of fluid decreases,
Since the drive device can be downsized, the installation area of the elevator and its drive device can be reduced.

[0010]

Embodiments of the present invention will be described with reference to FIGS. [Embodiment 1] First, FIG. 1 is a schematic configuration diagram of a fluid pressure elevator according to an embodiment of the present invention. The fluid pressure elevator shown in FIG. 1 includes a car 7, a fluid pressure cylinder 1, a fluid pressure control device 10, and an energy storage device 20. The car 7 is guided by rails 8,
It is supported by the fluid pressure cylinder 1 via a rope 6 and a pulley 4. The fluid pressure cylinder 1 is composed of a cylinder 2 and a plunger 3 having a pulley 4 on the top thereof.
The plunger 3 expands and contracts by supplying and discharging the working fluid to and from the plunger 3.
The fluid pressure control device 10 is a fluid pressure pump 1 capable of rotating in the forward and reverse directions.
2, a motor 11, and control valves 13 and 14, and controls the flow of fluid between the fluid pressure cylinder 1 and the energy storage device 20.

The energy storage device 20 includes a cylinder 21,
It is composed of a piston 22 whose operating range is limited by a stopper 26 and a high-pressure gas tank 23, which converts the pressure energy of a fluid, which is a working medium, into the pressure energy of a gas and stores it. When the plunger 3 of the fluid pressure cylinder 1 is at the bottom, the working fluid is injected so that the piston 22 of the energy storage device 20 is at the top, and the load of the car 7 is half the rated load and the rated stroke When the stroke is half, the gas is filled in the gas chamber 25 and the gas tank 23 so that the pressure of the fluid pressure cylinder 1 and the pressure of the fluid chamber 24 of the cylinder 21 are substantially balanced.

Let Wc be the weight of the car, Wl be the load of the car, Wj be the weight of the pulley and the plunger, Aj be the cross-sectional area of the plunger, and pj be the pressure of the fluid pressure cylinder.
The fluid pressure of the cylinder 21 of the energy storage device 20 (pressure of the fluid chamber 24) is po, and gas pressure (pressure of the gas chamber 25)
Pa and the variable volume of the fluid chamber 24 of the fluid pressure cylinder 1 is V
j, the maximum volume of the fluid chamber 24 of the cylinder 21 is Vo (Vj
<Vo), the flow of fluid from the energy storage device 20 to the fluid pressure cylinder 1 is Qp, and the power supplied from the motor 11 to the fluid pressure pump 12 at this time is Lm. The speeds of the plunger 3 and the piston 22 are vj and va, and the pressure-receiving areas of the fluid side and the gas side of the piston 22 are Ao and Aa. When the structure of the fluid pressure elevator is an indirect type as shown, it is given by the following equations.

[Equation 1] pj = (2 · (Wc + Wl) + Wj) / Aj Lm = Qp · (pj-po) Qp = Aj · vj = Ao · va Ao ・ po = Aa ・ pa

Further, when the car 7 is at a position of about half of the rated stroke, the pressure in the fluid chamber 24 is po≈.
(2 · Wc + Wl + Wj) / Aj (the gas filling amount is not strict but is roughly sufficient). Further, it is sufficient that the amount of working fluid is slightly larger than twice the fluctuation volume of the fluid pressure cylinder (Vj + Vo), and a large tank is not required unlike the conventional case. Further, since the pressure of the fluid chamber 24 is increased to accumulate the pressure in the gas chamber 25, the size of the energy storage device 20 is also reduced, and the energy storage device 20 is much smaller than the conventional fluid pressure power unit. Space can be saved.

Since the fluid pressure elevator shown in FIG. 1 has the above-mentioned configuration, it operates as follows. First, when raising the car 7, the control valve 14 is opened to communicate the fluid chamber 24 of the cylinder 21 with the fluid pressure pump 12 through the flow path 15b, and the fluid pressure pump 12 is driven to control the control valve 13. Channel 1
High-pressure fluid is supplied to the fluid pressure cylinder 1 via 5a, and the car 7 is pushed up along the rail 8 via the rope 6. The speed control of the car 7 is executed by the speed control of the motor 11 that drives the fluid pressure pump 12.

Next, when lowering the car 7, the control valve 13 is opened to allow the high pressure fluid in the fluid pressure cylinder 1 to flow through the passage 1.
5a communicates with the fluid pressure pump 12, drives the fluid pressure pump 12 to move the high pressure fluid to the fluid chamber 24 of the energy storage device 20 through the control valve 14 and the flow path 15b, and the weight of the car 7 by itself. To lower the car 7 using. The speed control of the car 7 is executed by controlling the rotation speed of the fluid pressure pump 12 with the motor 11 as in the case of the ascending.

The fluid pressure elevator of this embodiment is adjusted as follows. After the elevator is assembled, the working fluid is supplied to the fluid pressure cylinder 1 and the energy storage device 20 at a low pressure. Because the fluid pressure is low, the car 7
Can't push up his own weight. However, the hydraulic cylinder 1 is filled with working fluid. Further, since the energy storage device 20 has no force to push the piston 22 (gas is not enclosed), even if the fluid pressure is low, the piston 22 is pushed up and the fluid flows into the fluid chamber 24 and is filled with the working fluid. The fluid chamber 24 of the fluid pressure cylinder 1, the fluid pressure control device 10 and the energy storage device 20 is now filled with the working fluid. After that, the working gas is filled in the gas tank 23 at a required pressure.

[Embodiment 2] FIG. 2 is a schematic configuration diagram of a fluid pressure control device according to another embodiment of the present invention. In the fluid pressure control device 10A of this embodiment, the control valves 13 and 14 are integrally configured. With this configuration, the fluid pressure control device 10A can be further downsized, the number of parts can be reduced, and the manufacturing cost can be reduced.

[Embodiment 3] FIG. 3 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention. FIG. 3 shows a fluid pressure circuit (hydraulic circuit) of the fluid pressure control device 10 according to an embodiment and a car precision position correcting device 140. The fluid pressure control device 10 includes a motor 11, a fluid pressure pump 12, main switching valves 31, 32, a pilot switching valve 33, shuttle valves 34, 35, a relief valve 36, a suction valve 37, and a tank 38. Although not shown in FIG. 3, the flow passage 15 a communicates with the fluid pressure cylinder 1 and the flow passage 15 b communicates with the energy storage device 20. The fluid pressure cylinder 1 and the energy storage device 20 include a flow path 15a,
15b, main switching valves 31, 32, and fluid pressure pump 12
Are connected through.

When driving the elevator, when the pilot switching valve 33 is excited, one of the flow passages 15a and 15b becomes the pilot fluid pressure via the shuttle valve 34, and the main control valves 31 and 32 are operated. Channel 15a,
15b and the fluid pressure pump 12 are connected. When the fluid pressure pump 12 is driven by the motor 11 in the ascending or descending direction, the pressure fluid (oil) flows from the flow passages 15b to 15a or in the opposite direction to raise or lower the car 7. After switching off the elevator, pilot switching valve 3
When the excitation of 3 is released, the main switching valves 31 and 32 return to their original positions and hold the stopped position of the car 7. Shuttle valve 3
5. The relief valve 36 is an emergency valve that prevents the passages 15c and 15d from having an abnormally high pressure.

On the contrary, the suction valve 37 prevents the flow paths 15c and 15d from becoming vacuum and damaging the fluid pressure pump 12. The main switching valves 31, 32 are one pilot switching valve 3
By 3, it is possible to drive simultaneously. Further, since the driving is always performed at the higher pressure, the area of the pilot pressure receiving portion of the main switching valves 31, 32 can be reduced. Further, at the time of a power failure (when the power is cut off), the pilot switching valve 33 and the main switching valves 31, 32 return to the positions shown in the figure, so that there is an effect that the fluid is blocked and the position of the car 7 is safely maintained.

The precise position correction device 140 improves the phenomenon that the car sinks and floats due to the elasticity of the rope and the compressibility of the oil when the passenger gets on and off the car 7.
That is, the pressure is accumulated in the accumulator 143 at all times, and when the car 7 sinks, the flow rate control valve 144 is driven to supply the fluid to the fluid pressure cylinder 1 and the car 7
At the time of floating, the control is performed to discharge the fluid. The tank 38 of the fluid pressure control device 10 and the tank 147 of the precision position correction device 140 may be shared. This precise position correction device 1
40 can improve the riding comfort when the car is stopped, and also has a function of replenishing the fluid when the fluid in the fluid pressure control device 10 becomes low.

Next, FIG. 4 is a structural diagram of the main switching valve in the fluid pressure control system of FIG. That is, FIG. 4 corresponds to FIG.
3 is an embodiment of the structure of the main switching valves 31 and 32 shown in the embodiment of FIG. Here, the main switching valve 31a on the fluid pressure cylinder side
The pilot switching valve 33 will be described. The fluid from the flow path 15a connected to the fluid pressure cylinder is guided from the flow path 50c to the pilot switching valve 33 via the shuttle valve 34. Further, the pilot switching valve 33 communicates with the pilot chamber 48 from the flow path 50a. Similarly, channel 5
0b and 50d also communicate with the energy storage device side. The drain chamber 48c is for returning the fluid leaked from the pilot chambers 48b, 48 to the tank 38.

The operation will be described below. Pc1: pressure in the flow passage 15a, Pp1: pressure in the flow passage 15c, F1: spring force, S1, S2, S3, S4: pressure receiving areas of the main switching valve 31a. When the fluid flows, the main switching valve 31a is pushed up by rotating the fluid pressure pump 12 and raising the pressure. Therefore, when expressed as a force relationship in which the frictional force is ignored as a condition for opening the main switching valve 31a, the following equation is obtained.

## EQU00002 ## Pp1.S2 + Pc1. (S3-S2)> Pc1.S1 + F1 When flowing from the flow passage 15a to the flow passage 15c, the pilot switching valve 33a is excited to open the main switching valve 31a. The valve opening conditions at this time are as follows.

## EQU00003 ## Pp1.S2 + Pc1. (S3-S2) + Pp1.S4> Pc1.S1 + F1 The structure of the main switching valve 31a of the present embodiment can be driven at a higher speed by increasing S4. Also (Pc1
Even when <Pp1), the valve closed state can be maintained by increasing (S1-S3).

FIG. 5 is a sectional view showing the construction of the hydraulic circuit and each valve of the fluid pressure control system of FIG. That is, FIG.
The structure of the main switching valve 31a shown in the embodiment of FIG. 4 is shown in FIG.
An embodiment applied to the embodiment will be shown. Shuttle valve 34
Always selects the fluid pressure on the high pressure side, and the fluid is guided to the pilot switching valve 33 through the groove 34a or the groove 34b. At the same time when the start command is input to the fluid pressure pump 12, the pilot switching valve 33 is also excited. Along with this, two main switching valves 31a and 31b are simultaneously driven by the fluid on the high pressure side. The flow rate of the fluid in the fluid pressure cylinder is controlled according to the rotation speed of the fluid pressure pump 12, and the speed of the car 7 is controlled according to the flow rate. Therefore, in the case of raising the car, the fluid pressure pump 12 is started from the energy storage device 20 side to the side of the fluid pressure cylinder 1 to feed the fluid, and in the case of lowering, the opposite is true.

When the normal car is stopped, for example,
When the pressure on the flow channel 15a side is higher than that on the flow channel 15b side,
The pressure decreases in the order of the flow path 15a, the flow path 15c, the flow path 15d, and the flow path 15b, and the flow paths 15c and 15d have almost the same pressure. Therefore, the main switching valve 31b may open depending on the pressure value. However, the main switching valve 31a is always closed by the pressure on the high pressure side due to the pressure receiving area, so that the fluid between the fluid pressure cylinder 1 and the energy storage device 20 can be shut off.
That is, the car 7 can be reliably held in position. The same applies when the flow path 15b side has a high pressure. Also,
When the inside of the fluid pressure control valve 10 becomes abnormally high pressure, the fluid is released from the relief valve 36 to the tank 38 through the shuttle valve 35 that selects the high pressure side, and the pressure is adjusted.
Further, a suction valve 37 is provided so as not to damage the fluid pressure pump 12 when the inside of the flow paths 15a, 15b, 15c and 15d becomes negative pressure. As the pilot switching valve 33 and the relief valve 36 shown in this embodiment, commercially available products may be used.

[Fourth Embodiment] FIG. 6 is a hydraulic circuit diagram of a fluid pressure control device according to a fourth embodiment of the present invention. In the fluid pressure control device 10B shown in FIG. 6, the fluid pressure circuit is almost the same as that of the embodiment of FIG. 3, but the main switching valves 31a, 3a.
1b is configured to be driven by separate pilot switching valves 33a and 33b. When the car 7 rises, the pilot switching valve 33a is excited to start the fluid pressure pump 12,
The main switching valve 31b is opened by the fluid pressure from the fluid pressure pump 12, and supplies the fluid from the passage 15a to the passage 15b.
When the car 7 is descending, the pilot switching valve 33b is excited to perform the reverse operation.

In this way, the pilot switching valves 33a, 3
3b is a fluid pressure control device 10 having a long life and high reliability because it operates once each time the car 7 is raised and lowered.
The effect that B can be provided is obtained. Further, when the differential pressure across the main switching valves 31a and 31b is large, a shock appears when the elevator is started. Therefore, if the pilot switching valve 33a or the pilot switching valve 33b is excited in accordance with the rise of the pressure. There is also an effect peculiar to the present embodiment that enables smooth startup.

[Fifth Embodiment] FIG. 7 is a sectional view showing the structure of a main switching valve portion according to still another embodiment of the present invention.
The main switching valve portion shown in FIG. 7 is composed of a main switching valve 70 and two pilot switching valves 62a and 62b. Channel 1
When flowing fluid from 5a, 15b in the direction of flow paths 15c, 15d (when flowing fluid from a fluid pressure cylinder to a fluid pressure pump or from an energy storage device to a fluid pressure pump)
Excites the pilot switching valves 62a and 62b, shuts off the fluid in the pilot chamber 71 from the flow paths 15a and 15b, and discharges the fluid to the tank 38 through the flow path 72c. Therefore, the main switching valve 70 is opened by the fluid pressure in the flow paths 15a, 15b, 15c, 15d. Similarly, when the fluid is made to flow from the flow passages 15c, 15d in the direction of the flow passages 15a, 15b (when the fluid is made to flow from the fluid pressure pump to the fluid pressure cylinder or from the fluid pressure pump to the energy storage device), pilot switching is similarly performed. The valves 62a and 62b are excited.

In this embodiment, the pilot switching valve 62a,
62b may be a commercially available product, and its part and the main switching valve 70
Can be easily configured and manufactured, so that the flow paths 72a, 72b,
72c can be shortened and the main switching valve 70 can be driven at high speed.
Furthermore, the entire control valve can be manufactured in a small size and at low cost. Normal,
In order to close the main switching valve 70 when the elevator is stopped, the excitation of the pilot switching valves 62a and 62b is released, and the main switching valve 70 is pressed against the valve seat by the fluid pressure of the flow paths 15a and 15b to close it. Also, when the car is stopped, for example, when the pressure on the fluid pressure cylinder side is high, it is the main switching valve on the fluid pressure cylinder side, and when the pressure on the energy storage device side is high, the main switching valve on the energy storage device side. Completely shut off the fluid. That is, the structure is such that the main switching valve with the higher pressure shuts off the fluid and holds the car position reliably.

[Sixth Embodiment] FIG. 8 is a sectional view showing the structure of a main switching valve portion according to still another embodiment of the present invention.
The structure and operation of the main switching valve 70 shown in FIG. 8 are similar to those of the embodiment shown in FIG. The difference is the pilot switching valve portion, which is composed of a first pilot switching valve 61 and second pilot switching valves 62a and 62b. In this embodiment, the flow rate of the first pilot switching valve 61 is larger than that of the second pilot switching valves 62a and 62b, so that the main switching valve 70 can be operated quickly and the main switching valve 70 can be operated. The structure is simple and the manufacturing is easy. Also in this embodiment, the fluid is shut off by the main switching valve with the higher pressure.

FIG. 9 is a sectional view showing an example of the first pilot switching valve shown in FIG. Each flow path corresponds to the flow path of the embodiment shown in FIG. The operation will be described with reference to FIGS. The signal is the second pilot switching valve 62a, 6
When not input to 2b, the first pilot switching valve 6
1 is at the position shown in FIG. 8, which guides the fluid to the pilot chamber 71 and closes the main switching valve 70 by the fluid pressure. When the signal is input, the fluid from the flow paths 15a and 15b is guided to the control chamber 66b. The valve body 67 is driven by this fluid pressure,
The pilot chamber 71 communicates with the tank 38 from the flow path 65, and the fluid in the pilot chamber 71 is discharged to the tank 38. This first switching valve 61 has a larger flow rate than the switching valves 62a and 62b shown in the embodiment of FIG. By using these as the second pilot switching valves 62a and 62b as they are, the fluid in the pilot chamber 71 can be quickly supplied and discharged, and the main switching valve 70 can be driven quickly by further reducing the control chamber 66b. be able to.

[Embodiment 7] FIG. 10 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention.
In the figure, those having the same reference numerals as those in FIG. 4 are the same parts as in the previous embodiment. The fluid pressure control device of FIG. 10 is a fluid pressure control device 10C that does not use a pilot switching valve, and has the same configuration as that of the embodiment of FIG. 4 except for the switching valve. Hereinafter, the operation of the main switching unit will be described on the flow path 15a (fluid pressure cylinder) side. Flow path 1 from fluid pressure pump 12
5a, the main switching valve 80a opens, and when the fluid pressure pump 12 discharges the fluid from the flow path 15a, the main switching valve 80a also opens. Therefore, the main switching valves 80a and 80b are opened by the change in the fluid pressure caused by the rotation of the fluid pressure pump 12. As a result, the main switching valve 80
Since a and 80b correspond to the valve opening operation and the activation signal of the fluid pressure pump 12, there is an effect that the control becomes simple.

[Embodiment 8] FIG. 11 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention.
In the figure, those having the same reference numerals as those in FIG. 10 are the same parts as those in the previous embodiment, and therefore their explanations are omitted. The fluid pressure control device 10D of FIG. 11 is an example in which the tank is eliminated by eliminating the return fluid, and the main switching valves 80a and 80b are equivalent to those of the embodiment of FIG. However, the relief valve 36 has a hydraulic circuit configuration in which the fluid of abnormally high pressure is released to the low pressure side by the check valves 37a and 37b. In addition, since the tank is eliminated, no suction valve is provided.

Therefore, as a measure for preventing damage to the fluid pressure pump 12, a method of detecting the pressures in the flow passages 15c and 15d and stopping the operation of the fluid pressure pump 12 when a negative pressure is used is used. According to the present embodiment, the same effect as that of FIG. 10 is expected, and since the tank is eliminated, a very compact fluid pressure control device 10D can be constructed.

[Embodiment 9] FIG. 12 is a configuration diagram of a main switching valve portion applied to the fluid pressure control devices of FIGS. 10 and 11. The connection relationship between the fluid pressure pump 12, the fluid pressure cylinder 1, and the energy storage device 20 is shown. In the figure, subscripts a and c represent the fluid pressure cylinder 1 side, and subscripts b and d represent the energy storage device 20 side. The main switching valves 80a and 80b are
Restrictors 81a, 8 provided between the flow paths 84c, 84d connecting the flow paths 15a, 15b and the pilot chambers 83a, 83b.
1b, flow paths 15c and 15d, and pilot chambers 83a and 8
3b and the flow paths 84a and 84b connecting the check valves 82a and 82b. Channel 1
5c and 15d are the fluid pressure pump 12 and the flow paths 15a and 15d.
b is connected to the fluid pressure cylinder 1 and the energy storage device 20, respectively.

Next, the operation will be described on the side of the fluid pressure cylinder 1. When flowing the fluid from the flow passage 15c to the flow passage 15a, the fluid pressure pump 12 raises the pressure in the flow passage 15c to open the main switching valve 80a against the spring force of the spring 47d. In addition, the fluid is passed from the channel 15a to the channel 15c
When the fluid pressure pump 12 is operated, the flow path 15
The pressure in c decreases, the check valve 82a is opened by the fluid pressure from the flow path 84a, and the fluid pressure pump 12 sucks out the fluid in the pilot chamber 83a. Along with this, diaphragm 8
Since there is 1a, the fluid does not flow into the pilot chamber 83a more than the outflow amount, the pressure drops, and the fluid pressure in the flow path 15a opens the main switching valve 80a. On the contrary, at this time, the energy storage device 20 simultaneously operates in exactly the opposite manner.

Further, at the time of normal stop, for example, when the flow passage 15a on the fluid pressure cylinder 1 side has a higher pressure, the pressure becomes lower in the order of the passages 15a, 15c, 15d, 15b. However, the flow paths 15c and 15d have almost the same pressure. Therefore, the fluid pressure of the fluid pressure cylinder 1 is equal to
c, the throttle 81a, the pilot chamber 83a, the flow path 84a, and the check valve 82a to act on the flow path 15c.
extend to d. That is, in the steady state, the flow path 15a and the flow path 1 are
The same pressure is applied for 5d. However, the fluid on the high pressure side
The low-pressure side is completely shut off by the check valve 82b and the main switching valve 80b.

At this time, the pressure in the high-pressure side passage 15d is Pp2, the pressure in the low-pressure side passage 15b is Pc2, and the spring 4
If the spring force of 7 is F2 and the frictional force is ignored, the area S5 where the main switching valve 80b receives the fluid pressure on the high pressure side is determined by the following equation.

## EQU00004 ## S5 <F2 / (Pp2-Pc2) If S5 is determined in this way, the main switching valve on the low pressure side can always shut off the fluid, and the position of the car 7 can be reliably maintained. As an effect, since the main switching valves 80a and 80b have a simple structure, there is an effect peculiar to this embodiment that the fluid pressure control device can be downsized and the manufacturing cost can be reduced.

[Embodiment 10] FIG. 13 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention. The fluid pressure control device 10E shown in FIG. 13 is a tank 3 that receives the return fluid from the pilot switching valves 33a and 33b.
In order to make 8 as small as possible, the suction valve is not incorporated. The switching valve portions 90a and 90b operate and operate in the same manner as the embodiments of FIGS. 3 and 4. As a substitute for the suction valve for preventing the fluid pressure pump 12 from being damaged by negative pressure in the flow passages 15e and 15f during the elevator operation, a method of electrically detecting the pressure in the flow passages 15e and 15f is available. is there. That is, when the pressure in the flow paths 15e and 15f becomes negative, it is achieved by lowering the rotation speed of the fluid pressure pump 12 or by controlling a signal to the motor 11 so as to stop the fluid pressure pump 12 slowly. Alternatively, the fluid pressure pump 1
It is not necessary to detect the pressure when there is no risk of the 2 being damaged.

Since the fluid in the tank 38 overflows if left unattended, the amount of fluid in the tank 38 is detected. When an overflow is likely to occur, the solenoid valve 91 is excited when the elevator is stopped, and at the same time, the fluid pressure pump 1 moves in the direction in which the fluid is sent to the energy storage device side flow path 15b.
The fluid in the tank 38 can be returned to the fluid pressure control device by slowly rotating 2. Further, in the relief valve 36, the high pressure side is selected by the shuttle valve 35 in order to prevent abnormal high pressure in the fluid pressure control valve, and the check valve 92
The pressure is adjusted by selecting the low pressure side with a and 92b. According to the present embodiment, it is possible to realize a fluid pressure control device for an elevator that allows the tank 38 to be downsized and requires less driving power.

[Embodiment 11] FIG. 14 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention. In the fluid pressure control device 10F shown in FIG. 14, each of the main switching valve 90a, the pilot switching valve 33, and the suction valve 93 is composed of only one, and the fluid pressure cylinder side passage 15a is always more than the energy storage device side passage 15b. The number of parts of the fluid pressure control valve can be reduced by setting so as to be higher.
The operation and function of the main switching valve portion 90a are similar to those of the embodiment shown in FIGS.

The relief valve 36 allows the fluid to escape to the flow path 15b on the low pressure side when the pressure exceeds the set pressure to adjust the pressure.
In the suction valve 93, the flow passage 15g is normally higher than the flow passage 15b, and the fluid pressure pump 12 moves the passage 15e to the flow passage 1b.
When flowing the fluid to 5b, the suction valve 93 is closed. However, when a failure occurs in the switching valve portion 90a and the flow path 15e becomes lower than the flow path 15b, the suction valve 93 opens, and the low-pressure side fluid is sucked from the flow path 15g, and the fluid pressure pump Protect 12 Further, the solenoid valve 91 operates and operates similarly to the embodiment of FIG. With the above configuration, it is possible to reduce the number of parts and configure a fluid pressure control valve having a smaller driving power than the conventional one.

[0043]

As described in detail above, according to the present invention, it is possible to provide a fluid pressure elevator capable of improving energy efficiency when driving a fluid pressure elevator and reducing driving power. Further, according to the present invention, it is possible to provide a fluid pressure elevator which is a control valve having a simple structure, a fluid pressure control device can be miniaturized to reduce an installation area, and can improve utilization efficiency of a building.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a fluid pressure elevator according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a fluid pressure control device according to another embodiment of the present invention.

FIG. 3 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention.

FIG. 4 is a structural diagram of a main switching valve in the fluid pressure control device of FIG.

FIG. 5 is a cross-sectional view showing a configuration of a hydraulic circuit and each valve of the fluid pressure control device of FIG.

FIG. 6 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the configuration of a main switching valve section according to still another embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a configuration of a main switching valve portion according to still another embodiment of the present invention.

9 is a sectional view showing an example of the first pilot switching valve shown in FIG.

FIG. 10 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention.

FIG. 11 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention.

FIG. 12 is a configuration diagram of a main switching valve unit applied to the fluid pressure control devices of FIGS. 10 and 11.

FIG. 13 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention.

FIG. 14 is a hydraulic circuit diagram of a fluid pressure control device according to still another embodiment of the present invention.

[Explanation of symbols]

1 Fluid Pressure Cylinder 7 Cars 10, 10A, 10B, 10C, 10D, 10E, 10
F fluid pressure control device 11 motor 12 fluid pressure pumps 13, 14 control valves 15a, 15b, 15c, 15d flow path 20 energy storage device 31, 32, 60, 70, 80a, 80b, 94, 94
a, 94b Main switching valve 33, 33a, 33b Pilot switching valve 34, 35 Shuttle valve 36 Relief valve 37, 37a, 37b Suction valve 38 Tank 48, 48a, 63, 71, 83, 83a, 83b Pilot chamber 50a, 50b, 50c, 50d, 64, 65, 66
a, 66b, 72a, 72b, 72c, 84a, 84b, 84c, 84d flow paths 61, 62a, 62b pilot switching valves 81a, 81b throttles 82a, 82b, 92a, 92b, 93 check valve 91 solenoid valves 90a, 90b switching Valve unit 140 Precision position correction device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Haruo Watanabe             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center (72) Inventor Go Ogasawara             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center (72) Inventor Eiichi Sasaki             Hitachi, Ltd. 1070 Ige, Katsuta City, Ibaraki Prefecture             Factory Mito Factory

Claims (16)

[Claims] 1. The speed of a car directly or indirectly coupled to the top of the hydraulic cylinder is controlled by controlling the flow rate of fluid supplied to or discharged from the hydraulic cylinder. In a controlled fluid pressure elevator, an energy storage means for temporarily storing fluid pressure energy, and a fluid pressure control device between the energy storage means and the fluid pressure cylinder, which has at least a fluid pressure pump and a fluid pressure control valve. A fluid flow path connecting the fluid pressure cylinder, the fluid pressure control device, and the energy storage means, and reciprocating the fluid between the energy storage means and the fluid pressure cylinder by the fluid pressure control device, A fluid pressure elevator, wherein the fluid pressure cylinder is expanded and contracted to raise and lower a car. 2. The speed of a car directly or indirectly coupled to the top of the fluid pressure cylinder is controlled by controlling the flow rate of fluid supplied to or discharged from the fluid pressure cylinder. In a fluid pressure elevator to be controlled, energy storage means for temporarily storing fluid pressure energy, a motor between the energy storage means and the fluid pressure cylinder, the speed of which is controlled by an inverter, and a fluid pressure pump driven thereby. And a fluid pressure control device having a fluid pressure control valve for controlling the fluid supplied to and discharged from the fluid pressure pump to the fluid pressure cylinder or the energy storage means, and a fluid pressure control device having a tank for recovering the return fluid. A fluid flow path connecting the control device and the energy storage means, and the energy storage means by the fluid pressure control device. The fluid pressure by reciprocating the fluid between the cylinder and the fluid pressure cylinder to extend and retract and increase the car, hydraulic elevator, characterized by being configured so as to descend. 3. A fluid pressure control valve in a fluid pressure control device, a main switching valve for controlling fluid from a fluid pressure pump, a pilot switching valve for driving the main switching valve, a relief valve for preventing abnormal high pressure, piping, and 3. The fluid pressure elevator according to claim 2, comprising a suction valve that prevents the pump from becoming negative pressure, and a tank that recovers the return fluid. 4. The main switching valve in the fluid pressure control valve is driven by controlling the fluid in the pilot chamber of the main switching valve with either the pilot switching valve or the solenoid valve. The fluid pressure elevator described. 5. The main switching valve of the fluid pressure control valve is driven by a first pilot switching valve, and the first pilot switching valve is driven by a second pilot switching valve. A fluid pressure elevator as described. 6. A fluid pressure control valve in a fluid pressure control device comprises a main switching valve for controlling fluid from a fluid pressure pump, a check valve and a throttle for controlling fluid in a pilot chamber for driving the abnormality, and a malfunction. The fluid pressure elevator according to claim 2, comprising a relief valve for preventing high pressure, a suction valve for preventing the piping and the fluid pressure pump from becoming negative pressure, and a tank for collecting the return fluid. 7. A fluid pressure control valve in a fluid pressure control device comprises a main switching valve for controlling fluid from a fluid pressure pump, a check valve and throttle for controlling fluid in a pilot chamber for driving the main switching valve, and an abnormality. The fluid pressure elevator according to claim 2, comprising a relief valve for preventing high pressure, and a suction valve for preventing the piping and the fluid pressure pump from becoming negative pressure. 8. The main switching valve in the fluid pressure control valve is driven by limiting the fluid in the pilot chamber of the main switching valve with a check valve and a throttle.
Or the fluid pressure elevator according to any one of 7 to 7. 9. A main switching valve in a fluid pressure control valve has a throttle in a flow passage that connects a pilot chamber of the main switching valve and a port on either the fluid pressure cylinder side or the energy storage means side. 8. A check valve is provided between the pilot chamber of the main switching valve and the port on the fluid pressure pump side to allow only the flow of fluid from the pilot chamber to the fluid pressure pump. One of the hydraulic elevators. 10. A fluid pressure control valve in a fluid pressure control device includes two main switching valves, one of which controls fluid on a fluid pressure cylinder side and the other of which controls fluid on an energy storage means side. The fluid pressure elevator according to claim 2, wherein the fluid is shut off by the main switching valve having a higher pressure at all times. 11. A fluid pressure control valve in a fluid pressure control device has two main switching valves, one of which controls a fluid of a fluid pressure cylinder side and the other of which controls a fluid of an energy storage means side. 3. The fluid pressure elevator according to claim 2, wherein the fluid is shut off by the main switching valve whose pressure is always lower. 12. A fluid pressure control valve, a main switching valve that controls fluid from a fluid pressure pump, a pilot switching valve that drives the fluid pressure pump, a relief valve that prevents abnormally high pressure, and a tank that recovers fluid. The hydraulic elevator according to claim 2, comprising a solenoid valve provided between the pump port and the tank. 13. The fluid pressure elevator according to claim 1, wherein the pressure on the fluid pressure cylinder side is always lower than the pressure on the energy storage means side. 14. The fluid pressure control valve comprises a main switching valve for controlling fluid from a fluid pressure pump, a pilot switching valve for driving the fluid, a relief valve for preventing abnormally high pressure, and a negative pressure in the piping and pump. 14. A fluid pressure elevator according to claim 1, further comprising: a suction valve for preventing such a change, a tank for recovering the return fluid, and a solenoid valve provided between the pump port and the tank. . 15. The fluid pressure control valve replenishes fluid in a fluid pressure cylinder or an energy storage device by means of an electromagnetic valve and a fluid pressure pump.
A hydraulic elevator according to any of the claims. 16. The speed of a car directly or indirectly coupled to the top of the fluid pressure cylinder is controlled by controlling the flow rate of fluid supplied to or discharged from the fluid pressure cylinder. In a controlled fluid pressure elevator, an energy storage means for temporarily storing fluid pressure energy, and a fluid pressure control device between the energy storage means and the fluid pressure cylinder, which has at least a fluid pressure pump and a fluid pressure control valve. , A car position correction device and these, a fluid pressure cylinder, a fluid pressure control device, a position correction device,
And a fluid flow path connecting the energy storage means.