JPH0350133Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to an oil temperature control device for a hydraulic elevator, and particularly relates to an improvement of an oil cooling device.

(Prior art) In the case of conventional hydraulic elevators, in order to prevent the viscosity of the oil from changing due to changes in the temperature of the oil used, resulting in a decline in the stable running performance of the hydraulic elevator, on the other hand, the elevator equipment has been rationalized. Because the amount of oil is not excessive, the temperature tends to rise when the elevator runs, so conventionally a cooling device was added as a measure to prevent temperature rise, but cooling devices are generally air-cooled. is used.

(Problem that the invention aims to solve) Air-cooled cooling systems use surrounding air to cool the fan by rotating a fan, but the cooling performance is determined by the ambient temperature of the fan, and the air surrounding the fan is not used in the machine room. It was difficult to maintain stable cooling performance because the size, structure, ventilation equipment, etc. of the cooling system were easily affected by the environment.
For this reason, it was difficult to maintain a constant oil temperature.

The present invention has been made in view of the above points, and an object of the present invention is to provide an oil temperature control device that maintains a constant temperature of oil used for controlling a hydraulic elevator and achieves stable elevator running performance.

[Structure of the invention] (Means for solving the problem) In order to solve the above problem, the present invention uses an oil temperature control device for a hydraulic elevator to reduce the heat of oil in a hydraulic elevator that raises and lowers a car using hydraulic pressure. A heat exchanger that transfers water to water, a water tank, an oil temperature gauge installed in the oil tank that outputs an output when the oil temperature rises and reaches a predetermined value, and an oil temperature gauge that receives the output of this oil temperature gauge and an oil circulation pump that circulates the oil in the water tank to the heat exchanger; a water circulation pump that circulates the water in the water tank to the heat exchanger; and a water temperature meter that detects whether the water temperature in the water tank is higher or lower than a set temperature. , a water level gauge that detects that the water level in the water tank is above a predetermined high water position and below a predetermined low water position;
a drain valve that starts draining water from the water tank when the water temperature is high and stops draining when the water level falls below the low water position; A water supply valve that starts supplying water to a water tank and stops supplying water when the water level reaches a high water level or higher.

(Function) By transferring the heat of the oil in the hydraulic elevator to the water in the water tank via a heat exchanger, when the oil temperature gauge installed in the oil tank detects a predetermined value when cooling the oil, The oil circulation pump is driven to circulate the oil in the oil tank to the heat exchanger, and the water circulation pump is also driven to circulate the water in the water tank to the heat exchanger. starts draining the water tank when the water temperature is high;
The water drain is stopped when the water level is below the low water level, and the water supply valve starts supplying water to the water tank when the water level is below the low water level, and when the water level is above the high water level. By stopping the water supply from time to time, it is possible to maintain a constant water amount and water temperature, and the oil temperature in the oil tank can be controlled at a constant level via a heat exchanger.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram of the oil temperature control device of the present invention, and FIGS. 2 to 4 are control circuit diagrams of the device shown in FIG. 1.

First of all, in Fig. 1, 1 is an oil tank, 2 is an oil temperature gauge, 3 is an oil pipe, 4 is a heat exchanger, 5 is an oil circulation pump, 6 is a motor for driving the pump in 5, and 7 is a heat exchanger in 4. This is a cooling unit that collectively houses a water circulation pump, oil circulation pumps 5 and 6, and a pump drive motor. 8 indicates a water pipe, 9 a water supply pump, 10 a motor for driving a water supply pump, and 11 a water supply pump 9. and 10 water supply pump drive motors are collectively housed in the water supply unit, 12 is the water supply piping, 13 is the water tank,
14 is a water temperature gauge, 15 is a liquid level gauge, 16 is a solenoid valve for water supply, and 17 is a solenoid valve for drainage. these are,
The control circuit shown in FIGS. 2 to 4 operates as follows.

19 is a control power source, and 2a is a normally open contact of the oil temperature gauge 2, which closes when the oil temperature exceeds a certain value. 20
is an oil temperature detection relay that is energized in response to the operation of the oil temperature gauge 2.

14a is a normally open contact of the water temperature gauge 14, and when the water temperature exceeds a certain value, the contact is closed and the water temperature detection relay 21 is energized. 15a is a low level contact of the liquid level gauge 15, which closes when the water level is below a certain value and excites the low water level detection relay 22, and 15b is a high level contact of the liquid level gauge 15, which closes when the water level is below a certain value. closes and energizes the high water level detection relay 23. Here, the low level contact 15a and the high level contact 15b of the liquid level gauge 15 are set to close independently depending on the position, that is, the water level. 24 is a water supply detection relay, which is connected in series with the normally open contact 22a of the low water level detection relay 22. Normally closed contact 23 of high water level detection relay 23
A and a normally open contact 24a of the water supply detection relay 24 are connected in parallel to the normally open contact 22a.

Therefore, when the water level of the water tank 13 falls below the low water position, the contact 22a closes and the water supply detection relay 24 is activated.
is energized, the contact 24a closes, and the energization of the water supply detection relay 24 is self-maintained. When the water level exceeds the high water level, the contact 23a opens and the water supply detection relay 24 is demagnetized. 25 is a drainage detection relay, which is connected in series with the normally open contact 23b of the high water level detection relay 23. A series circuit of the normally closed contact 22b of the low water level detection relay 22 and the normally open contact 25a of the drain detection relay 25 is connected in parallel to the normally open contact 23b.

Therefore, when the water level of the water tank 13 becomes higher than the high water position, the drainage detection relay 25 is energized, and the energization is self-maintained until the water level becomes lower than the low water position. 26 is a drainage relay, and water temperature detection relay 2
The normally open contact 21a of the water supply detection relay 24 and the normally closed contact 24b of the water supply detection relay 24 are connected in series. 23c is a normally open contact of the high water level detection relay 23, and is connected in parallel with the normally closed contact 24b. A series circuit of the normally closed contact 22c of the low water level detection relay 22 and the normally open contact 26a of the drain relay 26 is connected in parallel with the series circuit of the normally open contact 21a and the normally closed contact 24b. 27 is a water supply relay, which is connected in series with the normally open contact 22d of the low water level detection relay 22.
A series circuit of a normally closed contact 23d of the high water level detection relay 23 and a normally open contact 27a of the water supply relay 27 is connected in parallel to the normally open contact 22d. A cooling operation contactor 28 is connected to the normally open contact 20a of the oil temperature detection relay 20, and operates the drive motor 6 of the oil circulation pump 5 and the water supply pump drive motor 10 of the water supply pump 9 when the oil temperature becomes high. , the oil and water are circulated to the cooling device 4 to lower the oil temperature.

29 is a power source for the motor, 30 and 31 are circuit breakers, and 28a and 28b are normally open contacts of the cooling operation contactor 28. Further, 27a is a normally open contact of the water supply relay 27, which is connected to the water supply electromagnetic valve 16 to automatically supply and drain water from the water tank 13.

The operation of this embodiment configured in this way will be explained. First, we will explain the water supply and drainage operations when the water temperature is high.

Assume that the water level is now above the high water level. At this time, the drainage detection relay 25 is energized, and the water supply detection relay 24 is demagnetized. Therefore, the contact 24b is closed. Also, contact 23c
is also closed. Since the temperature is high, the contact 21a is closed, the drain relay 26 is energized, and draining starts. When the water falls below the high water level, the contact 23c opens. Drainage relay 26 until the water level is below the low water level.
The excitation of is self-maintained by the closed circuit of the contact 26a, and drainage continues.

When the water falls below the low water level, contacts 24b and 22c are opened, drain relay 26 is demagnetized, and drainage is stopped.

Since the water level is below the low water level, the water supply detection relay 24 is energized and the drain detection relay 25 is demagnetized. Since the contact point 22d is closed, the water supply relay 27 is energized and water supply is started. When the water reaches the low water position or higher, the contact 22d opens. Until the water reaches the high water position or higher, the excitation of the water supply relay 27 is self-maintained by closing its contact 27a, and water is continuously supplied. Even if the temperature drops during water supply, water supply continues. When the water reaches the high water position or higher, the contact 23d opens and water supply is stopped.

If the temperature is low at this time, the process ends in this state.

If the temperature is still high, draining and water supply are performed by repeating the above steps, and when the temperature drops, water is supplied to the high water position and the operation ends.

Next, a case will be described in which the water temperature becomes high when the water level is below the high water position and above the low water position.

The contact 23c is open, but the contacts 21a, 2
Since 4b is closed, the drain relay 26 is energized and draining starts. The subsequent operations are similar to those described above.

Next, a case where the water temperature is low will be explained. When the water level is below the low water level, the contact 22d closes, thereby energizing the water supply relay 27 and starting water supply. When the water supply reaches the high water level or higher, contact 23d
is opened, the water supply relay 27 is demagnetized, and the water supply is stopped. In this case, since the temperature is low and the contact 21a is closed, no water is drained, resulting in water saving.

If the water level is above the low water level, water will not be supplied.

As explained above, when the water temperature is high, draining and water supply are repeated, and when the water temperature becomes low, water is supplied to the high water position and ends.

Since the tap water maintained at a constant amount and temperature in this manner is used, the oil temperature in the oil tank 1 can be controlled to be constant via the heat exchanger 4.

[Effects of the invention] As explained above, according to the hydraulic elevator control device of the invention, the temperature of the oil in the oil tank can be kept constant through the heat exchanger using water whose temperature is kept within a certain range. Since the elevator can be controlled, stable elevator running performance can be maintained.

[Brief explanation of the drawing]

The drawings show the present invention; FIG. 1 is a system diagram of an oil temperature control device, and FIGS. 2 to 4 are control circuit diagrams of the oil temperature control device shown in FIG. 1... Oil tank, 2... Oil temperature gauge, 4... Heat exchanger, 5... Oil circulation pump, 9... Water circulation pump,
13...Water tank, 14...Water temperature gauge, 15...Water level gauge, 16...Water supply solenoid valve, 17...Drainage solenoid valve.

Claims (1)

[Scope of utility model registration request] Hydraulic elevators that raise and lower cars using hydraulic pressure are equipped with a heat exchanger that transfers heat from oil to water, a water tank, and an oil tank that outputs an output when the oil temperature rises and reaches a predetermined value. an oil temperature gauge; an oil circulation pump that receives the output of the oil temperature gauge and circulates oil in the oil tank to the heat exchanger; a water circulation pump that circulates water in the water tank to the heat exchanger; and the water tank. a water temperature gauge that detects whether the water temperature in the water tank is higher or lower than a set temperature; a water level gauge that detects that the water level in the water tank is above a predetermined high water position or below a predetermined low water position; a drain valve that starts draining water from the water tank when the water temperature is high and stops draining when the water level falls below the low water level; An oil temperature control device for a hydraulic elevator, comprising a water supply valve that starts supplying water to a tank and stops supplying water when the water level reaches a high water level or higher.