JPH09255262A - Oil temperature increase running device of hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform stable oil temperature increase running and quiet oil temperature increase running at night. SOLUTION: An oil temperature detector 1 detects an oil temperature and an oil temperature increase value detecting means 4 detects an oil temperature increase value. An electric motor rotational speed adjusting means 5 controls the rotational speed of an electric motor 9 based on the detected oil temperature increase value. The rotational speed of the electric motor 9 is reduced by 1/2 at night by an environment condition setting means 6 and control is performed by a time two times as that for the daytime. Thus, an oil temperature is increased without being affected by a room temperature and no adverse effects are given to a surrounding environment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for performing an oil temperature increasing operation when the temperature of oil for driving a hydraulic elevator decreases.

[0002]

2. Description of the Related Art Generally, in a hydraulic elevator, when the oil temperature changes, the oil viscosity changes, and when the oil temperature decreases, the viscosity increases. As a result, the equipment such as the hydraulic pump is damaged, and the leak amount and mechanical efficiency of the hydraulic pump change, and the load torque to the electric motor and the response speed of the check valve change. For this reason, when the oil temperature is low, a means for operating the oil temperature raising device for a certain period of time to raise the oil temperature is provided.

In recent years, with the advancement of semiconductor technology, a method of varying the voltage and frequency to control the rotation speed of the induction motor over a wide range has been widely adopted. An oil temperature raising device for performing an oil temperature raising operation by the electric motor rotation speed control method is disclosed in, for example, Japanese Patent Laid-Open No. 3-158375. This is because the hydraulic pump of the induction motor is connected with an electromagnetic clutch, the rotation speed of the hydraulic pump is controlled via the electromagnetic clutch during normal operation, and when the oil temperature drops, the electromagnetic clutch is disconnected so that only the induction motor operates. Is driven, and the oil temperature is raised by utilizing the heat generation of the electric motor and the rotation loss energy of the oil.

[0004]

In the conventional oil temperature raising operation apparatus for a hydraulic elevator as described above, when a low temperature is detected, the oil temperature raising apparatus is operated for a certain period of time. However, when the room temperature is low, such as at night or in winter,
The oil temperature is less likely to rise than when the room temperature is high, and even if the oil temperature raising device is operated, the oil temperature does not rise much from the low temperature detection level and the oil temperature raising operation is ended. Further, when the elevator is stopped, the oil temperature is likely to drop, so that there is a problem that the oil temperature raising operation is repeated many times in a short time.

Further, in the case of nighttime, when the oil temperature raising operation is repeated, there is a problem that noise such as a rotating sound of an electric motor and an operating sound of an electromagnetic contactor affects a living room. On the other hand, if the oil temperature detector detects a low temperature and fails, the oil temperature increasing operation is continued, and on the contrary, the oil temperature becomes too high and the hydraulic circuit device is damaged.

The present invention has been made in order to solve the above-mentioned problems, and has made it possible to perform a stable oil temperature increasing operation and to perform a quiet oil temperature increasing operation at night. It is an object of the present invention to provide an oil temperature rising operation device for a hydraulic elevator.

[0007]

According to a first aspect of the present invention, there is provided a hydraulic elevator oil temperature increasing operation apparatus, wherein a rotation speed of an electric motor separated from a hydraulic pump when a low temperature is detected is changed to an oil temperature during oil temperature increasing operation. The control is based on the rising value.

Further, an oil temperature rising operating device for a hydraulic elevator according to a second aspect of the present invention is the one according to the first aspect of the invention, wherein the rotational speed of the electric motor during the oil temperature raising operation is changed according to environmental conditions. .

The oil temperature rising operating device for a hydraulic elevator according to a third aspect of the present invention is the one according to the first aspect of the invention, wherein the rotation speed of the electric motor during the oil temperature raising operation is higher than that during the normal oil temperature raising operation depending on environmental conditions. Is also set to a low value.

The oil temperature rising operating device for a hydraulic elevator according to a fourth aspect of the present invention is the one according to the first aspect, wherein the rotation speed of the electric motor during the oil temperature raising operation is higher than that during the normal oil temperature raising operation depending on environmental conditions. Is also set to a low value for a long time.

Also, in the oil temperature rising operation device for a hydraulic elevator according to the fifth invention, in the first invention, when the oil temperature rising value during the oil temperature rising operation is out of a predetermined range, the oil temperature rising operation is abnormal. It is determined to be.

Further, an oil temperature raising operation device for a hydraulic elevator according to a sixth aspect of the present invention is the one according to the fifth aspect of the invention, wherein when an abnormality in the oil temperature raising operation is determined, the electric motor is stopped.

Further, the oil temperature rising operating device for the hydraulic elevator according to the seventh aspect of the present invention detects the oil temperature rising value during the oil temperature rising operation, and outputs the command value of the rotational speed of the electric motor separated from the hydraulic pump as described above. The change is made according to the detected oil temperature rise value.

The oil temperature rising operating device for a hydraulic elevator according to an eighth aspect detects the oil temperature rising value during the oil temperature rising operation, and detects the command value of the rotation speed of the electric motor separated from the hydraulic pump as described above. When the oil temperature rise value is outside the predetermined range, the oil temperature rise operation is determined to be abnormal, and the predetermined range is changed according to the set environmental condition. It was done like this.

[0015]

1 to 4 are views showing an embodiment of the present invention. FIG. 1 is a functional configuration diagram of essential parts, FIG. 2 is an overall configuration diagram, FIG. 3 is a control circuit diagram, and FIG. Is an operation flowchart, in which the same reference numerals indicate the same parts.

In FIG. 1, 1 is an oil temperature detector provided in an oil tank 16 (FIG. 2) of a hydraulic elevator, 2 is an oil temperature detector 1, which is connected to an oil temperature increasing operation based on an oil temperature increasing value. Oil temperature increase operation determination means for determining the execution of 3), 3 is an oil temperature increase operation device for executing the oil temperature increase operation, 4 is the oil temperature detector 1
The oil temperature rise value detecting means 5 for detecting the oil temperature rise value by comparing the oil temperature data from the oil temperature data before a predetermined time with the oil temperature rise value from the oil temperature rise value detecting means 4 increases the oil temperature. It is an electric motor rotation speed adjusting means for instructing the rotation speed of the electric motor during operation.

6 is the current environmental condition of the hydraulic elevator,
For example, environmental condition setting means for setting environmental conditions such as whether or not the time for carrying out the oil temperature raising operation is at night when quietness is required and outputting it to the electric motor rotation speed adjusting means 5, and 7 is an oil temperature rising value detecting means 4 Abnormality determination means for determining the presence or absence of an abnormality based on the oil temperature rise value output from the motor and the environmental conditions output from the environmental condition setting means 6 and sending a command to the motor rotation speed adjusting means 5, 8 is a motor rotation This is an electric motor drive device for driving the electric motor 9 shown in FIG. 2 according to a command from the speed adjusting means 5.

In FIG. 2, R, S and T are three-phase AC power supplies, 11 is a converter for converting three-phase AC into DC, and 12 is a converter.
Is a smoothing capacitor connected to the DC side of the converter 11, 13 is an inverter that is connected to the smoothing capacitor 12 and converts DC into three-phase AC of variable voltage / variable frequency, 14
Is an AC power source R, S, T for the regenerative power from the inverter 13.
A regenerative converter 15 for returning to is a main contact that is inserted between the inverter 13 and the electric motor 9 and turns on / off the output of the inverter 13.

Reference numeral 16 is an oil tank for storing oil for driving the hydraulic elevator. The electric motor 9 and the oil temperature detector 1 are the oil tank 1.
It is immersed in 6 oil. Reference numeral 17 is a hydraulic pump coupled to the electric motor 9 through an electromagnetic clutch 18, 19 is a solenoid valve connected to the hydraulic pump 17 by piping and driven by a solenoid 19a to control the flow of oil, and 20 is a solenoid valve 19 to a hydraulic cylinder. A pipe connected to (not shown), 21 is an operation control device composed of a microcomputer, and is connected to the electromagnetic clutch 18, the solenoid 19a, and the oil temperature detector 1.

In FIG. 3, +,-are DC control power supplies, 2
Reference numeral 5a is a low temperature detection contact that operates by the output of the oil temperature increase operation determination means 2 and closes when a predetermined low temperature is detected, 25b.
Is a low-temperature detection contact that is also opened, 26 is a low-temperature detection relay, 26a and 26b are normally open contacts, 26c is a normally-closed contact, and 27 is a time-return type oil temperature rising time relay.
7a and 27b are normally open contacts, 28 is a nighttime detection contact that is closed at night, and 29 is a timed reset type extended time relay.
9a is the normally open contact.

Numeral 30 is normally closed, and the abnormality judging means 7
Abnormality detection relay contact that opens when an abnormality is discriminated by 31
Is an oil temperature raising device corresponding to the oil temperature raising operating device 3.

Next, the operation of this embodiment will be described. First, the normal operation will be described with reference to FIG. Normally, the electromagnetic clutch 18 is operated by being biased by a command from the operation control device 21, and the electric motor 9 and the hydraulic pump 17 are connected. When the start-up main contact 15 is energized and a control command is given to the inverter 13, the converter 1
The electric power converted into direct current by 1 and converted into alternating current by the inverter 13 is supplied to the electric motor 9.

Thus, the electric motor 9 drives the hydraulic pump 17 via the electromagnetic clutch 18, and the oil in the oil tank 16 is
It is supplied to the hydraulic cylinder through the solenoid valve 19 and the pipe 20 to raise a car (not shown). When the car is descending, the solenoid 1 receives a command from the operation control device 21.
9a is energized and the solenoid valve 19 switches the oil flow path.
This returns oil from the hydraulic cylinder to the oil tank 16 and lowers the car. When the car moves up and down, the rotation speed of the electric motor 9 is controlled according to a predetermined traveling pattern, so that the up-and-down speed of the car is controlled.

Next, the operation during the oil temperature rising operation will be described with reference to FIGS.
It will be explained by. The oil temperature TH from the oil temperature detector 1 measured last time in step S1 is set as the previous oil temperature THB, and the current input value is newly set to the oil temperature TH. In step S2, it is determined whether the oil temperature TH is equal to or lower than the oil temperature rise start temperature. If it is equal to or lower than the temperature, the process proceeds to step S3 to close the low temperature detection contact 25a,
If it exceeds, the process proceeds to step S4 and the low temperature detection contact 25a
To release.

In step S5, it is determined whether the low temperature detection relay 26 is energized. If the oil temperature is low, step S
Since the low temperature detection contact 25a is closed at 3, the low temperature detection relay 26 is energized, the contacts 26a and 26b are closed, and the contact 26c is opened. On the other hand, the oil temperature rise time relay 27
Normal time (+)-(25b)-(26c)-(27)-
It is energized by the (-) circuit and the contacts 27a and 27b are closed. Therefore, the low temperature detection relay 26 is self-held by closing the contact 26a. Further, by opening the contact 26c, the oil temperature rise time limit relay 27 is de-energized to start the time count. This time limit is set to the time required to raise the oil temperature.

Since the abnormality detection relay contact 30 is closed, when the contact 26b is closed, the oil temperature raising device 31 is closed.
Works. That is, since the operation control device 21 deenergizes the electromagnetic clutch 18, the electric motor 9 rotates while being separated from the hydraulic pump 17. With this, the oil temperature gradually rises due to the heat generation of the electric motor 9 and the rotational loss energy of the oil.
This is the oil temperature increasing operation. Then, after a lapse of a predetermined time, the oil temperature rising time limit relay 27 is restored and the contact 27a is opened.

At this time, if the oil temperature is higher than the oil temperature rise start temperature, the low temperature detection contact 25a is also open, so the low temperature detection relay 26 is deenergized, the contacts 26a and 26b are opened, and the contact 26c is opened. Close. By opening the contact 26b,
The oil temperature raising device 31 becomes inoperative, the electric motor 9 is stopped, and the oil temperature raising operation ends.

Now, in step S5, the low temperature detection relay 26
If it is determined that is deenergized, the oil temperature increasing operation is not performed, the process proceeds to step S18, and the initial value flag SYOKI is set to "0" as an initial setting. Low temperature detection relay 2
When No. 6 is urged, the process proceeds to step S6, and it is determined whether the oil temperature raising process is the initial stage. If it is initial, since the initial value flag SYOKI is "0", the process proceeds to step S7, the rotation speed N is initialized to α, and the initial value flag SYOKI is set to "1". For α, for example, the flow chart of FIG. 4 is processed every 1 minute and the oil temperature is 15 ° C. for 10 minutes.
This is the rotation speed required to increase from (oil temperature rise start temperature) to 25 ° C. Then, it progresses to step S13.

If the initial value flag SYOKI is "1" in step S6, the process proceeds to step S8 and the oil temperature TH of this time is set.
And the previous oil temperature THB are calculated to calculate the temperature rise value THD.
And In step S9, the temperature rise value THD is the predetermined value TH
It is determined whether it is lower than S (for example, zero). If it is lower, it is determined that the oil temperature detector 1 or the like is out of order because the oil temperature has not risen despite the oil temperature raising operation. Then, the process proceeds to step S10 to open the abnormality detection relay contact 30. As a result, the oil temperature raising device 31 does not operate and the oil temperature raising operation ends.

If the temperature rise value THD is greater than or equal to the predetermined value THS in step S9, the process proceeds to step S11, the abnormality detection relay contact 30 is closed, and the oil temperature raising operation is continued.
Next, in step S12, the rotation speed N of the electric motor 9 is calculated by (1 / THD) × N. For example, if the temperature rises by 1 ° C. in the first cycle (for example, 1 minute), the temperature rise value THD becomes 1 and the rotation speed N becomes α (the initial value is N = α). If the temperature rise value THD is 0.5 in the second cycle, the value obtained by doubling the rotation speed in the first cycle is the rotation speed in the second cycle (2 × α).
And

In step S13, it is determined whether it is a night time zone. If it is not night time, the process proceeds to step S14, the night time detection contact 28 is opened, the rotation speed of the electric motor 9 is set to N in step S15, and the predetermined value THS is set. Set to β (predetermined value for temperature rise confirmation). Next, during the night hours, the frequency of use of the elevator is low. In addition, when there is a living room near the machine room, there is a concern about noise such as rotation noise of the electric motor 9 and operation noise of the electromagnetic contactor. Therefore, if it is determined in step S13 that it is during the nighttime, the process proceeds to step S16, the nighttime detection contact 28 is closed, and the rotation speed N of the electric motor 9 is set to 1/2 and controlled in step S17. Also, the predetermined value T
Set HS to β / 2.

This means that the rotation speed N of the night electric motor 9 is 1 /
When it is set to 2, the temperature rise value THD is also halved, so that the abnormality detection in steps S9 and S10 is prevented. Also, by closing the night-time detection contact 28, (+)
In the circuit of-(27b)-(28)-(29)-(-),
The extension time relay 29 is energized and the contact 29a is closed. With this, the low temperature detection relay 26 continues to hold itself. That is, the oil temperature rise time relay 27 becomes inoperative when the set time limit expires, and the contact 27a is opened, but the low temperature detection relay 26 is not deenergized by closing the contact 29a.

With this, the oil temperature raising device 31 continues to operate, the oil temperature raising limit time is extended, and at night, the oil temperature raising operation is performed at a rotation speed which is half that of the daytime time zone and takes twice as long. By performing the above, the rotation noise of the electric motor 9 and the number of times of operation of the electromagnetic contactor are halved, and the noise given to the surrounding environment is reduced.
Here, step S8 is the oil temperature increase value detection means 4, step S9 is the abnormality determination means 7, step S10 is the abnormal stop command means, steps S12, S14 to S17 are the electric motor rotation speed adjustment means 5, and step S13. Constitutes an environmental condition setting means 6.

In step S9 of FIG. 1, the temperature rise value THD is set.
When the temperature rise value THD is smaller than or equal to the predetermined value THS, the temperature rise value THD is determined to be abnormal.
More desirable. In the above embodiment,
Although the configuration including the relay circuit has been described, it is clear that all the configurations can be implemented by software and the same effect can be obtained. It is also possible to change the oil temperature rise start temperature in step S2 of FIG. 1 according to the conditions set by the environmental condition setting means 6.

[0035]

As described above, in the first and seventh inventions of the present invention, the rotation speed of the electric motor is controlled based on the oil temperature increase value, so that the oil temperature can be controlled without being affected by the room temperature. There is an effect that the temperature can be raised to a certain temperature in a certain time.

Further, in the second aspect of the invention, the rotation speed of the electric motor during the oil temperature increasing operation is changed according to the environmental conditions, so that there is an effect that the oil temperature increasing operation can be performed without adversely affecting the surrounding environment. .

Further, in the third invention, the rotation speed of the electric motor during the oil temperature increasing operation is set to a value lower than that during the normal oil temperature increasing operation depending on environmental conditions, and in the fourth invention, it is set to be longer. In addition, the rotating noise of the electric motor and the number of operations of the electromagnetic contactor can be reduced to maintain a quiet environment even at night.

In the fifth aspect of the invention, when the oil temperature increase value during the oil temperature increase operation is out of the predetermined range, it is determined that the oil temperature increase operation is abnormal. Therefore, the oil temperature detector, the oil temperature increase device, etc. There is an effect that can detect the abnormality of.

Further, in the sixth aspect of the invention, when it is determined that the oil temperature rising operation is abnormal, the electric motor is stopped.
There is an effect that it is possible to prevent wasteful oil temperature rise operation and damage to the equipment.

In the eighth aspect of the invention, the rotation speed of the electric motor during the oil temperature increasing operation is changed according to the oil temperature increasing value and the environmental condition, and when the oil temperature increasing value is out of the predetermined range, the oil temperature increasing operation is abnormal. Since it is determined that the abnormality determination range is changed according to the environmental conditions, there is an effect that a more stable oil temperature increasing operation can be realized.

[Brief description of drawings]

FIG. 1 is a functional configuration diagram of essential parts showing an embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 3 is a control circuit diagram showing an embodiment of the present invention.

FIG. 4 is an operation flowchart showing an embodiment of the present invention.

[Explanation of symbols]

1 oil temperature detector, 3 oil temperature rising operating device, 4 oil temperature rising value detecting means, 5 electric motor rotation speed adjusting means, 6 environmental condition setting means, 7 abnormality determining means, 8 electric motor driving device,
9 electric motor, 16 oil tank, 17 hydraulic pump, 18
Electromagnetic clutch, 26 oil temperature detection relay, 27 oil temperature rise time relay, 28 night time detection contact, 29 extension time limit relay, 30 abnormality detection relay contact, 31 oil temperature rise device, S8 oil temperature rise value detection means, S9 abnormality determination means , S
10 Abnormal stop command means, S12, S14 to S17 Motor rotation speed adjusting means, S13 Environmental condition setting means.

Claims (8)

[Claims] 1. An electric motor immersed in an oil tank operates a hydraulic pump at a variable speed to move a car of a hydraulic elevator up and down, and an oil temperature detector installed in the oil detects an oil temperature below a predetermined value. Then, in a device that separates and drives the electric motor from the hydraulic pump to increase the oil temperature, an electric motor rotation speed adjusting unit that controls the rotation speed of the electric motor based on the oil temperature increase value during the oil temperature increase operation. An oil temperature rising operation device for a hydraulic elevator, which is characterized by being equipped with. 2. The oil temperature rising operating device for a hydraulic elevator according to claim 1, further comprising environmental condition setting means for setting an environmental condition for changing the rotation speed of the electric motor during the oil temperature rising operation. 3. The rotation speed of the electric motor during the oil temperature rising operation,
2. The oil temperature rising operation device for a hydraulic elevator according to claim 1, further comprising environmental condition setting means for setting an environmental condition for making the value lower than that during a normal oil temperature rising operation. 4. The rotation speed of the electric motor during the oil temperature rising operation,
2. An environmental condition setting means for setting an environmental condition for setting a value lower than that during normal oil temperature increasing operation and for a longer time than during normal oil temperature increasing operation.
The oil temperature rising operation device of the hydraulic elevator described. 5. The hydraulic elevator according to claim 1, further comprising abnormality determining means for determining that the oil temperature increasing operation is abnormal when the oil temperature increasing value is out of a predetermined range during the oil temperature increasing operation. Oil temperature rise operation device. 6. The oil temperature rising operating device for a hydraulic elevator according to claim 5, further comprising an abnormal stop command means for outputting a command to stop the electric motor when the abnormality judging means judges an abnormality. 7. An electric motor immersed in an oil tank operates a hydraulic pump at a variable speed to elevate a car of a hydraulic elevator, and an oil temperature detector installed in the oil detects an oil temperature below a predetermined value. Then, in the device that drives the electric motor separately from the hydraulic pump to raise the oil temperature, the oil temperature rise value detection means for detecting the oil temperature rise value during the oil temperature rise operation, and the detected oil An oil temperature increase operating device for a hydraulic elevator, comprising: an electric motor rotation speed adjusting means for changing a command value of the rotation speed of the electric motor according to a temperature increase value. 8. An electric motor immersed in an oil tank operates a hydraulic pump at a variable speed to move a car of a hydraulic elevator up and down, and an oil temperature detector installed in the oil detects an oil temperature below a predetermined value. Then, in the device that drives the electric motor separately from the hydraulic pump to increase the oil temperature, an oil temperature increase value detecting means for detecting an oil temperature increase value during the oil temperature increase operation, and the oil temperature increase operation. Environment condition setting means for setting an environmental condition for changing the rotation speed of the electric motor, and an electric motor rotation speed for changing the command value of the rotation speed of the electric motor according to the detected temperature rise value and the set environmental condition. When the oil temperature increasing value during the oil temperature increasing operation is outside the predetermined range, the adjusting means determines that the oil temperature increasing operation is abnormal, and changes the predetermined range according to the set environmental condition. An oil temperature rising operation device for a hydraulic elevator, comprising: