JPH05147863A - Power unit of hydraulic elevator - Google Patents

Abstract

PURPOSE:To provide a hydraulic elevator power unit that receives no effect of the length of a suction pipe, and is easy to inject a priming oil, besides making a setup space reducible. CONSTITUTION:A filler hole 21a for a priming oil to be lubricated at the initial stage of operation of a coolant pump 11, is installed in a discharge side pipeline part 12 just behind this coolant pump 11 in a hydraulic fluid circulating route 20, while an air bleeding plug 24 is set up in the uppermost part of a suction side pipeline 8, and the suction side pipeline 8 is made so as to breathe at the time of injection of the priming oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit of a hydraulic elevator provided with a device for suppressing a rise in oil temperature of hydraulic oil.

[0002]

2. Description of the Related Art FIG. 4 is a front view showing an example of a power unit of a conventional hydraulic elevator disclosed in Japanese Patent Laid-Open No. 2-62392. In the figure, 1 is a frame-shaped base body, 2 is a hydraulic pump provided in the base body 1, and 3 is a base body 1.
An electric motor 4 provided inside to drive the hydraulic pump 2 is a flow control valve connected to the hydraulic pump 2, and a port on the right side thereof is connected to a hydraulic jack (not shown) of a hydraulic elevator via a pipe. Has been done. 5 is an oil tank which is provided to cover the upper surface of the base body 1 and is connected to the left port of the flow control valve 4, 6 is operating oil contained in the oil tank 5, 7 is a lid of the oil tank 5, and 8 is oil. The lower end penetrating the lid 7 of the tank 5 is a suction pipe inserted into the hydraulic oil 6 in the oil tank 5, and 9 is a first horizontal pipe whose one end is connected to the upper end of the suction pipe 8 by a deformed pipe 10. Is a self-priming coolant pump installed on the upper surface of the lid 7 of the oil tank 5 and having the suction side connected to the other end of the first horizontal pipe 9, and 12 denotes the first end connected to the discharge side of the coolant pump 11. 2 horizontal pipes, 13 is a vertical pipe whose lower end is connected to the other end of the second horizontal pipe 12 by a modified pipe 14, and 15 is a priming oil inlet 1 which can be closed by a plug 16.
A basically T-shaped deformed pipe having 5a, one end of which is connected to the upper end of the vertical pipe 13, 17 is installed on the upper surface of the lid 7 of the oil tank 5, and one end of which is connected to the other end of the deformed pipe 15. A radiator, 18 is a blower for blowing air to the radiator 17, and 19 is an upper end connected to the other side of the radiator 17 and a lower end penetrating the lid 7 of the oil tank 5 has a hydraulic oil 6 in the oil tank 5.
It is a return pipe inserted inside. That is, the coolant pump 11 and the radiator 17 are installed in the hydraulic oil circulation path 20 composed of the oil tank 5 and the pipes 8, 9, 10, 12, 13, 14, 15, and 19, and the radiator 17 is installed in the coolant pump 11. It is located higher than.
Then, the coolant pump 11 generates a flow of the hydraulic oil 6 in the hydraulic oil circulation path 20, and the radiator 17 cools the hydraulic oil 6 flowing in the hydraulic oil circulation path 20.

Therefore, the hydraulic pump 2 is driven by the electric motor 3.
When the oil is rotated, the hydraulic oil 6 flows into the hydraulic pump 2 and the flow control valve 4
When the elevator car (not shown) is driven upward by being pumped to the hydraulic jack through the port on the right side of the, and the flow control valve 4 is switched, the hydraulic oil 6 in the hydraulic jack causes the flow control valve 4 or the hydraulic pump 2 to move. The car is discharged to the oil tank 5 and the car descends. Then, when the elevator is continuously operated, the temperature of the hydraulic oil 6 rises, but the hydraulic oil 6 in the oil tank 5 is circulated in the hydraulic oil circulation path 20 by the coolant pump 11, and while being circulated, the radiator 6 is circulated. It is cooled by 17.

By the way, in the self-priming coolant pump 11 described above, it is necessary to inject priming oil into the priming oil chamber through the priming oil inlet 15a at the time of the first operation.
FIG. 5: is explanatory drawing for demonstrating the principle which starts the coolant pump 11 in the power unit of the conventional hydraulic elevator. The coolant pump 11 has priming oil chambers 11a and 11b in its casing, and when starting operation, gradually injecting priming oil from the priming oil inlet 15a on the discharge side, the priming oil chamber 11a , 11b
Until the oil level inside reaches the A and B levels, the air inside replaces the priming oil and comes out from the room through the second horizontal pipe 12. When the coolant pump 11 is started with the priming oil up to the A and B surfaces, the priming oil is instantaneously discharged, and the air enters the priming oil chambers 11a and 11b from the second horizontal pipe 12 side, and thereafter rotates. Do not self-prime even if you continue.

However, when the injection of the priming oil is continued even after the oil surface reaches the surfaces A and B, the air in the priming chambers 11a and 11b tends to come out from the suction side while being compressed. The oil level in the pipe 8 is lowered and bubbles are emitted from the lower end of the suction pipe 8. Since the pressure in the priming oil chambers 11a and 11b at this time is higher than the atmospheric pressure by H1, in order to push out the air from the lower end of the suction pipe 8 as described above, the priming oil inlet 1
It is necessary to make the height H2 of the oil surface inside the vertical pipe 13 provided with 5a from the oil surface in the nominal oil chamber higher than H1. Therefore, conventionally, the length dimension of the vertical pipe 13 is set to a dimension that allows H2> H1, and the priming oil is priming chamber 11
It is designed to be able to fully enter into a and 11b. When the oil level in the priming chambers 11a and 11b reaches the point C, further priming oil passes through the suction pipe 8 and drops into the oil tank 5 to balance at the position shown in FIG. At this time, H2
= H1.

When the coolant pump 11 is started in the balanced state as described above, the priming chambers 11a, 1a
The priming oil in 1b is discharged, and the priming oil chambers 11a and 11b are discharged.
The pressure inside and inside the suction pipe 8 decreases, and as a result, the hydraulic oil 6 in the oil tank 5 rises into the suction pipe 8 by an amount corresponding to the volume of the discharged nominal oil. Here, the priming chamber 11a,
Let V1 be the volume of the priming oil in 11b (volume from the A and B faces to the C face) and V2 be the volume in the suction pipe 8, V1>
If it is V2, before the priming oil in the priming chambers 11a and 11b reaches the A and B surfaces, the hydraulic oil 6 enters the priming chambers 11a and 11b from the suction pipe 8 to start the operation. V1
If <V2, even if the priming oil in the priming oil chambers 11a, 11b reaches the A and B surfaces, the priming oil chambers 11a, 11
The hydraulic oil 6 does not enter the inside of b and cannot be discharged, resulting in idling. Therefore, conventionally, the length dimension H from the oil surface of the suction pipe 8 in the oil tank 5 to the connection portion with the first horizontal pipe 9 is H.
The length of the entire suction pipe 8 including 3 is set as short as possible so that it is within the self-suction suction height (V1> V2).

[0007]

Since the conventional hydraulic elevator power unit is constructed as described above, the length dimension (H1 + H3) of the suction pipe 8 cannot be increased, and
As a result, the oil tank 5 is compressed in the height direction,
In order to secure the required amount of hydraulic oil 6, the oil tank 5 has to be enlarged in a plane, and the space occupied by the power unit is enlarged in a plane. Therefore, the machine room needs to be expanded accordingly. ..

When the oil tank 5 is enlarged in the height direction and the length dimension (particularly H1) of the suction pipe 8 is lengthened, the height H2 on the vertical pipe 13 side is correspondingly made higher than H1. Since it is necessary, the space occupied by the power unit becomes large in the height direction, and it is necessary to raise the ceiling of the machine room accordingly.

In view of the above points, the present invention has an object to obtain a power unit for a hydraulic elevator that is not affected by the length of the suction pipe, can easily inject priming oil, and can reduce the occupied space. To do.

[0010]

A power unit for a hydraulic elevator according to the present invention includes a base body in which a hydraulic pump and an electric motor for driving the hydraulic pump are incorporated, an oil tank installed on an upper surface of the base body, and the oil. A hydraulic oil circulation path having a suction pipe and a return pipe, the tip of which penetrates the upper surface of the tank is inserted into the hydraulic oil in the oil tank, and is installed in the hydraulic oil circulation path on the upper surface of the oil tank, A self-priming coolant pump that generates a flow of hydraulic oil in the circulation path, and a position higher than the coolant pump on the discharge side of the coolant pump in the hydraulic oil circulation path on the upper surface of the oil tank. And a radiator for cooling the working oil flowing in the circulation path, the discharge side piping portion immediately after the coolant pump in the working oil circulation path. , Provided with an inlet of the call oil lubrication during the initial operation of the coolant pump, at the top of the suction-side pipe is obtained by installing a plug for air vent.

[0011]

In the present invention, when the priming oil is injected during the initial operation of the coolant pump, if the air vent plug of the suction side pipe is removed to allow the suction pipe to breathe, the oil level inside the suction pipe increases. Rises to the oil level in the oil tank and compresses the volume of the portion of the suction pipe where air is present. In this state, if a specified amount of priming oil is injected from the priming oil inlet of the discharge side pipe, the priming oil will penetrate into the coolant pump without resistance, and will reach the suction side pipe through the gap of the coolant wheel of the coolant pump. It is confirmed from the air vent hole that the oil flows down from the pipe into the oil tank. In this state, the volume of the priming oil in the coolant pump is much larger than the volume of the air in the suction pipe, so the plug for the air vent hole and the plug for the priming oil inlet. Return to the original and start the operation of the coolant pump. When the operation of the coolant pump is started, priming oil is discharged from the coolant pump, and the working oil in the oil tank rises in the suction pipe by the amount corresponding to the volume of the priming oil discharged, and part of the working oil is removed. It is reliably sucked into the coolant pump and self-priming is started.

[0012]

【Example】

Example 1. FIG. 1 is a front view showing a power unit of a hydraulic elevator according to a first embodiment of the present invention, in which parts corresponding to those of the related art are designated by the same reference numerals. In the power unit of this embodiment, the second horizontal pipe 12 and the deformed pipe 14 arranged on the discharge side immediately after the coolant pump 11 in the hydraulic oil circulation path 20 are lubricated during the initial operation of the coolant pump 11. A T-shaped pipe 21 having a priming oil inlet 21a is installed so that the inlet 21a can be closed by a plug 22 and the coolant pump 11
The top of the pipe located on the suction side of the
A T-shaped tube 23 having an air vent hole 23a is installed at the connecting portion between the horizontal tube 9 and the suction tube 8 so that the suction tube 8 can breathe and the air vent hole 23a can be closed by a plug 24. The other features are basically the same as the conventional one, and the description thereof is omitted.

In the power unit of the hydraulic elevator of the present embodiment constructed as described above, when the coolant pump 11 is initially operated, when the priming oil is injected, the plug 24 of the air vent hole 23a on the suction side is removed and suction is performed. When the pipe 8 is in a breathable state, the oil level inside the suction pipe 8 rises to the oil level inside the oil tank 5, and the portion 8a where air is present in the suction pipe 8 (FIG. 5). Volume of H3) is compressed. In this state, the plug 2 of the injection port 21a on the discharge side
When 2 is removed and a quantity of priming oil equal to or larger than the volume of the priming oil chamber of the coolant pump 11 is injected from the inlet 21a, the priming oil penetrates into the coolant pump 11 without resistance and fills the priming oil chamber. The priming oil overflowing from the first horizontal pipe 9 flows into the oil tank 5 through the T-shaped pipe 23 and the suction pipe 8. It can be confirmed from the air vent hole 23a that the priming oil flows down from the suction pipe 8 into the oil tank 5. In this state, the volume of the priming oil in the coolant pump 11 is much larger than the volume of the portion 8a of the suction pipe 8 where the air is present. 21a and the air vent hole 23a are respectively plug 2
It is sealed by 2 and 24, and the operation of the coolant pump 11 is started. When the operation of the coolant pump 11 is started, priming oil is discharged from the coolant pump 11, and along with this, the hydraulic oil 6 in the oil tank 5 rises in the suction pipe 8 and is surely introduced into the coolant pump 11. It is sucked in and self-priming is started.

As described above, in the power unit of the hydraulic elevator according to the present embodiment, since the suction pipe 8 can breathe through the air vent hole 23a at the time of injecting the priming oil, the portion 8b of the suction pipe 8 which is inserted into the hydraulic oil 6b. No matter how long (see H1 in FIG. 5), the oil level in the suction pipe 8 always rises to the oil level height in the oil tank 5, so that the portion 8a in the suction pipe 8 where the air exists. Does not increase, and as a result, the height or volume of the oil tank 5 can be increased without increasing the height of the vertical pipe 13 (see H2 in FIG. 5).

Example 2. FIG. 2 is a front view showing a power unit of a hydraulic elevator according to a second embodiment of the present invention, and the portions corresponding to those of the first embodiment are designated by the same reference numerals. In the power unit of this embodiment, the oil level in the oil tank 5 in the suction pipe 8 (in this case, the oil level before the initial operation)
Air and hydraulic oil 6 only near the coolant pump 11 side
The point that the check valve 25 that allows the flow of No. 2 is installed is different from that of the first embodiment described above.

In this embodiment, since the priming oil injected during the initial operation of the coolant pump 11 can be stored up to the check valve 25 in the suction pipe 8, the suction pipe 8
The volume of the portion 8a in which the air is present (see H3 in FIG. 5) can be further compressed, and the degree of freedom in designing the suction pipe 8 is expanded.

Embodiment 3. FIG. 3 is a front view showing a power unit of a hydraulic elevator according to a third embodiment of the present invention, and parts corresponding to those of the second embodiment are designated by the same reference numerals. In the power unit of this embodiment, the suction pipe 8 is arranged in the vicinity of the return pipe 19, and a T-shaped pipe 23 connected in series from the suction pipe 8 in series on the upper surface of the lid 7 of the oil tank 5.
The radiator 17 is arranged over the first horizontal pipe 9, the coolant pump 11, the second horizontal pipe 12, and the T-shaped pipe 21 so that the hydraulic oil circulation path 20 is accommodated in the plane space of the radiator 17. The above-mentioned point is the same as the second embodiment.
Is different from the one.

In this embodiment, each horizontal pipe 9, 12
Is shortened, the load of the hydraulic oil circulation path 20 supported by the lid 7 of the oil dividing tank 5 can be reduced, and the lid 7
Effective use of the upper space can be achieved.

[0019]

As described above, according to the present invention, a priming oil injection port for lubricating oil at the initial operation of the coolant pump is provided at the discharge side piping portion immediately after the coolant pump in the hydraulic oil circulation path. At the same time, an air vent plug was installed at the top of the suction side pipe to allow the suction side pipe to breath when injecting the priming oil, so the length of the suction pipe is not affected and the priming oil is injected. The load due to self-priming during the initial operation is reduced, and the occupied space can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a power unit of a hydraulic elevator according to a first embodiment of the present invention.

FIG. 2 is a front view showing a power unit of a hydraulic elevator according to a second embodiment of the present invention.

FIG. 3 is a front view showing a power unit of a hydraulic elevator according to a third embodiment of the present invention.

FIG. 4 is a front view showing an example of a power unit of a conventional hydraulic elevator.

FIG. 5 is an explanatory diagram of a principle of starting a coolant pump in a conventional example.

[Explanation of symbols]

 1 Base 2 Hydraulic Pump 3 Electric Motor 5 Oil Tank 6 Hydraulic Oil 7 Lid (Upper Surface of Oil Tank) 8 Suction Pipe (Suction Side Piping) 11 Coolant Pump 12 Second Horizontal Pipe (Discharge Side Piping Site) 17 Radiator 19 Return Pipe 20 Hydraulic oil circulation path 21a Nominal oil inlet 24 Air vent plug

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoo Shimoaki 1 Hishimachi, Inazawa City Mitsubishi Electric Corporation Inazawa Works

Claims (1)

[Claims] 1. A base body having a built-in hydraulic pump and an electric motor for driving the hydraulic pump, an oil tank installed on the upper surface of the base body, and a tip penetrating the upper surface of the oil tank operating in the oil tank. A hydraulic oil circulation path having a suction pipe and a return pipe inserted in oil, and a self-priming which is installed in the hydraulic oil circulation path on the upper surface of the oil tank and generates a flow of the hydraulic oil in the circulation path. Type coolant pump, and a radiator arranged on the upper surface of the oil tank at a position higher than the coolant pump on the discharge side of the coolant pump in the hydraulic fluid circulation path and cooling the hydraulic fluid flowing in the circulation path. In a power unit of a hydraulic elevator equipped with, an initial operation of the coolant pump is performed at a discharge side piping portion immediately after the coolant pump in the hydraulic oil circulation path. Provided with an inlet of the call oil lubrication, the top of the suction-side pipe, the power unit of the hydraulic elevator, characterized in that they have installed plug for air vent.