JP3533559B2 - Tank integrated hydraulic power unit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic power unit, and more particularly, to a compact hydraulic power unit having a small installation height for a home elevator. 2. Description of the Related Art In a hydraulic elevator, a car is raised and lowered by flowing hydraulic oil from a hydraulic pump driven by a forward and reverse variable speed electric motor into and out of a hydraulic jack for raising and lowering the car. Things that move. [0003] The hydraulic pump discharges the pressure oil sucked from the tank at the time of forward rotation to the hydraulic jack side at a controlled flow rate through an electromagnetic control valve, and controls the pressure oil ejected from the hydraulic jack side at the time of reverse rotation. The flow is returned to the tank at the set flow rate. On the other hand, in recent years, elevators have been increasingly used not only in high-rise buildings and condominiums but also in ordinary houses. In this home elevator, there is a limit to the occupied space that can be obtained inside the house, so it is necessary to integrate peripheral devices of the hydraulic pump system as compactly as possible. [0005] Such a compact hydraulic power unit for an elevator is also mainly composed of an electric motor, a hydraulic pump, and a tank, as in a normal elevator, though the scale is different. Therefore, by using an electric motor-integrated hydraulic pump device in which an electric motor and a hydraulic pump are integrated, a more compact configuration can be achieved. FIG. 5 shows an example of a relatively compact hydraulic power unit using a conventional electric motor-integrated hydraulic pump device.
6 and a schematic configuration diagram of FIG. FIG. 5A is a plan view seen from above, and FIG. 5B is a front view. FIG. 6 shows FIG.
It is the side view seen from the arrow Z direction in (a). [0007] This unit is composed of a motor-integrated hydraulic pump device 101 and a hydraulic pump device 1 on a gantry 100.
Reference numeral 01 denotes a tank having a tank 120 for storing hydraulic oil supplied to and discharged from the hydraulic jack. Between the tank 120 and the hydraulic pump in the electric motor-integrated hydraulic pump device 101, the hydraulic pump sucks the pressure oil in the tank 120 and circulates the pressure oil extruded from the hydraulic jack side into the tank chamber. Oil pipe 102 is provided for this purpose. A drain pipe 103 for returning the drain oil from the hydraulic pump into the chamber of the tank 120 is also provided. A manual main on-off valve 105 and an electromagnetic on-off valve 106 are inserted and connected between the hydraulic pump and the hydraulic jack port. As described above, the tank 120 and the electric motor-integrated hydraulic pump device 101 are disposed on the same gantry 100, and a compact hydraulic power unit is configured. However, at present, the hydraulic power unit for home elevators is required to be further compact. In the conventional hydraulic power unit as described above, in particular, the piping between the hydraulic pump device and the tank requires not only an assembling work such as centering, but also the occupied space increases the volume of the entire unit. . SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a hydraulic power unit which can reduce the space occupied by pipes, is more compact than before, and is easy to assemble. [0011] In order to solve the above-mentioned problems, in the tank-integrated hydraulic power unit according to the first aspect of the present invention, an oil immersion type electric motor is driven in the same housing in the same housing. A hydraulic pump device containing a hydraulic pump unit and capable of cooling the electric motor in the housing by circulating hydraulic oil in the housing, and a tank unit for storing hydraulic oil supplied and discharged by the pump device; A tank-integrated hydraulic power unit integrally connected and arranged without piping, wherein the housing has a cup-shaped body with one end opened, an end cover for closing one end of the body, and a body. A tank unit mounting seat formed on an outer portion, wherein the tank unit is formed of an integrally cast product that is mechanically mounted on the mounting seat. In addition, a hydraulic oil storage tank chamber is formed in which the inner surface of the mounting seat is a part of the inner wall surface of the tank in a state of being oil-tightly mounted on the mounting seat, and a hydraulic pump unit is provided in the end cover and the tank unit mounting seat. An oil passage for communicating at least one of the supply / discharge ports of the tank with the hydraulic oil storage tank chamber, the oil passage opening into the tank chamber on the inner surface side of the tank unit mounting seat, On the inner surface side of the unit mounting seat, a drain opening penetrating the body connects the inside of the housing with the hydraulic oil storage tank chamber. In the present invention, the hydraulic oil storage tank unit is integrally attached to the housing of the electric motor-integrated hydraulic pump device, and is provided between the tank chamber and at least one of the supply / discharge ports of the hydraulic pump unit. Since the oil passage and the drain passage are a non-piped, tank-integrated hydraulic power unit provided in the housing, the pressure oil pipe and the drain pipe between the tank and the hydraulic pump device which are separately disposed are outside. The whole unit can be made more compact as compared with the conventional hydraulic power unit which is provided with a pipe. The oil passage and the drain passage communicate with the tank chamber and the supply / discharge port of the hydraulic pump unit at the same time that the tank unit is mounted on the mounting seat of the housing of the pump device. The power unit can be easily assembled without requiring troublesome work such as centering as in piping. The drain passage in the present invention is a drain opening penetrating the housing body of the electric motor-integrated hydraulic pump device on the inner surface side of the tank unit mounting seat and communicating the tank chamber with the inside of the housing. Hydraulic oil circulated to remove heat from the electric motor can be returned directly to the tank room. The hydraulic pump unit of the electric motor-integrated hydraulic pump device can be constituted by various types of pump units such as a vane pump, a gear pump, a piston pump, and the like. In the present invention, drain oil from the hydraulic pump unit is used for cooling the electric motor in the housing,
Since the drain opening provided in the housing body is directly communicated with the tank chamber, the high-temperature drain oil flows into the housing body tank chamber and transfers heat to a large amount of hydraulic oil in the tank chamber, thereby causing the tank unit wall surface to flow. It will be cooled by air cooling. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a tank-integrated hydraulic power unit for a home elevator employing a constant displacement vane pump as a hydraulic pump unit is shown in FIGS. Show. FIG. 1A is a plan view of the hydraulic power unit according to the present embodiment as viewed from above, and FIG. 1B is a front view. FIG. 2A is a side view seen from the tank side, and FIG. 2B is a cross-sectional view showing the inside of a housing of the electric motor-integrated hydraulic pump device. FIG.
FIG. 3 is a rear view of the hydraulic pump unit. The hydraulic power unit according to the present embodiment comprises:
It mainly comprises an electric motor-integrated hydraulic pump device 1 and a tank unit 20 that is integrally mounted and connected to the hydraulic pump device 1 and stores hydraulic oil for supplying and discharging the hydraulic device to an elevator hydraulic jack (not shown). Things. The housing of the hydraulic pump device 1 comprises a cup-shaped body 2 closed at one end, and an end cover 3 closing an end opening of the body 2, and the end cover 3 includes a vane rotor. The vane pump unit 5 is built in by forming a casing 4 containing therein. Outside the casing 4 inside the housing is a motor chamber 6 in which an oil immersion type motor 7 is disposed. The pump unit 5 and the motor 7 are coaxially driven by a rotor 8 with a shaft 9 having a coaxial structure. Are connected by That is,
The motor-integrated hydraulic pump device 1 is assembled by attaching the end cover 3 to the body 2 that includes the motor 7. On the other hand, a mounting seat 10 for mounting the tank unit 20 is provided on the outside of the body 2. The mounting seat 10 is formed so as to extend from the body 2 in a cylindrical shape. The opening edge 21 of the tank unit 20 is brought into oil-tight contact with the peripheral edge of the cylindrical opening by, for example, a gasket. The connection by the bolts forms a tank chamber 22 having an internal structure that is continuous in an oil-tight state by the cylindrical inner surface of the mounting seat 10 and the tank inner wall surface. In the housing, an oil passage opens inside the tank chamber 22 on the inner surface side from the end cover 3 to the mounting seat 10, and the other (end cover 3 side) communicates with a supply / discharge port of the pump unit 5. 11 is penetrated. The end cover 3 side of the oil passage 11 and the mounting seat 10 side communicate with each other at the same time as the end cover 3 is incorporated into the body 2 at the time of assembling the power unit. Further, on the inner surface side of the mounting seat 10, the body 2
In the motor room 6 and the tank room 22
A drain opening 12 communicating with the inside is formed. In the present embodiment, the drain oil from the pump unit 5 oozes from the casing 4 side into the electric motor chamber 6, fills while circulating in the electric motor chamber 6, and cools the electric motor 7.
Therefore, by continuously supplying the drain oil from the pump unit 5 into the motor chamber 6, the drain oil after circulation is pushed out from the motor chamber 6 through the drain opening 12 to the inside of the tank chamber 22. A manual main opening / closing valve 15 is provided between the hydraulic oil supply / discharge port of the pump unit 5 and the hydraulic jack port for the elevator, similarly to the conventional hydraulic power unit.
And an electromagnetic on-off valve 16 is inserted and arranged. As described above, in the hydraulic power unit according to the present embodiment, the tank unit 20 is integrally mounted on the electric motor-integrated hydraulic pump device 1 and has no external piping in the assembled state. The overall volume is reduced as compared with the case where the pipes are arranged and connected to the body, and the apparatus is made compact. The operation of the hydraulic elevator by the hydraulic power unit in this embodiment will be described below with reference to the circuit diagram shown in FIG. While the car is stopped, the motor 7 and the pump unit 5 are stopped by the main control device.
In the solenoid on-off valve 16 which is a single solenoid spring return type two-port two-position valve, the solenoid device c
Is in the non-excited state, the check valve (check valve) is in the shut-off position. In this state, the oil pressure in the oil passage on the hydraulic jack side is higher than the pressure in the oil passage on the pump unit side,
Is kept pressed by the hydraulic pressure to shut off the oil passage. Further, in this embodiment, a proportional control valve which is a 4-port 3-position valve of a double solenoid spring center type is further disposed between the electromagnetic on-off valve 16 and the pump unit 5. During stoppage, the solenoid device a and the solenoid device b of this proportional control valve are also in a non-excited state, the neutral position of the P port block is maintained, and oil supply from the pump unit 5 is shut off. Upon receiving a start signal based on a signal generated by an operation button on a car or an operation panel provided on each floor, the main control device drives the electric motor 7 and the elevator device valve to rotate and drive the electromagnetic opening / closing valve 16 and the proportional control valve. A control signal for opening and closing operation is given. When a start signal for raising the car is given, the solenoid device a of the proportional control valve is excited to take the raised position, and the oil passage is communicated from the pump unit 5 side to the solenoid on-off valve 16 side. The electric motor 7 starts rotating forward, and the pump unit 5 sucks hydraulic oil in the chamber of the tank 22 through the oil passage 11 and discharges the oil to the oil passage toward the electromagnetic on-off valve 16. As a result, the pressure in the pump-side oil passage of the check valve rapidly rises and becomes equal to or higher than the pressure in the jack-side oil passage, and the check valve operates to communicate with the jack-side oil passage, thereby sending pressure oil from the jack port to the hydraulic jack. The car rises. During the operation of the motor 7 and the pump unit 5 for raising the car, the drain oil of the pump unit 5 continuously seeps out of the casing 4 into the motor room 6 and fills the motor room 6. Circulation cools the electric motor 7 and is returned from the drain opening 12 into the tank chamber 22. To lower the car, the main controller switches the electric motor 7 and the pump unit 5 from normal rotation to reverse rotation, and at the same time, the solenoid device c of the solenoid on-off valve 16 and the solenoid device b of the proportional control valve. Is excited. As a result, the solenoid on-off valve 16 and the proportional control valve each take the descending position, and the hydraulic oil communicated with the oil passage and extruded from the hydraulic jack flows from the jack-side oil passage to the pump unit 5-side oil passage. The oil is returned from the unit 5 to the tank chamber 22 via the oil passage 11. When the car approaches the destination floor, a stop signal from a limit switch provided on each floor is sent to the main controller, whereby the flow rate of the pump unit 5 is reduced by the rotation speed control signal to the electric motor 7. Accordingly, the check valve gradually closes according to the differential pressure generated between the upstream side and the downstream side of the electromagnetic on-off valve 16, and the car is decelerated and stopped according to the closed state of the check valve. When the pressure difference between the upstream side and the downstream side disappears, the main control unit cuts off the excitation of the solenoid device a of the proportional control valve and returns to the neutral position. In the above embodiment, the case where a constant displacement vane pump is adopted as the hydraulic pump unit has been described. However, the hydraulic power unit according to the present invention is not limited to this. Various pumps can be used as long as they are suitable for hydraulic devices such as the above. Further, the present invention is not limited to a constant displacement pump and an electric motor, but may be a variable displacement pump. As described above, since the tank-integrated hydraulic power unit of the present invention can be assembled easily without piping, a compact unit particularly suitable for a home elevator can be obtained. There is.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a tank-integrated hydraulic power unit according to an embodiment of the present invention, (a) is a plan view of the hydraulic power unit as viewed from above, and (b) is It is a front view. FIG. 2 is an explanatory view of the hydraulic power unit in FIG. 1 (a) is a side view seen from a tank unit side,
(B) is sectional drawing which showed the inside of the housing of the electric motor integrated hydraulic pump apparatus. FIG. 3 is a rear view of the hydraulic power unit shown in FIG. 1; 4 is an elevator device valve circuit diagram for explaining the operation of hydraulic oil by the hydraulic power unit in FIG. 1. FIG. FIG. 5 is a schematic configuration diagram showing an example of a conventional hydraulic power unit for a home elevator, where (a) is a plan view seen from above the hydraulic power unit and (b) is a front view. FIG. 6 is a side view as viewed from an arrow Z direction in FIG. 5 (a). [Description of Signs] 1,101: Electric motor-integrated hydraulic pump device 2: Body unit 3: End cover unit 4: Casing 5: Pump unit 6: Electric motor room 7: Electric motor 8: Rotor 9: Shaft 10: Tank unit mounting Seat 11: oil passage 12: drain opening 15, 105: manual main opening / closing valve 16, 106: electromagnetic opening / closing valve 20: tank unit 21: opening edge 22: tank chamber 100: gantry 102: pressure oil pipe 103: drain pipe 120: tank

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F15B 1/00 B66B 9/04

Claims (1)

(57) [Claim 1] An oil immersion type electric motor and a hydraulic pump unit driven by the oil immersion type electric motor are housed in the same housing, and hydraulic oil is circulated in the housing so that the electric motor in the housing is formed. A tank-integrated hydraulic power unit in which a motor-equipped hydraulic pump device capable of cooling and a tank unit that stores hydraulic oil supplied and discharged by the pump device are integrally connected and arranged without piping, The housing has a cup-shaped body with one end opened, an end cover for closing the opening at one end of the body, and a tank unit mounting seat formed on an outer portion of the body. A hydraulic oil storage tank comprising an integrally cast product mechanically mounted on a seat and having an inner surface of the mounting seat as a part of a tank inner wall surface in a state of being oil-tightly mounted on the mounting seat. A hydraulic passage for communicating at least one of the supply / discharge ports of the hydraulic pump unit with the hydraulic oil storage tank chamber through the end cover and the tank unit mounting seat. An opening into the tank chamber on the inner surface side of the mounting seat, and a drain opening penetrating the body on the inner surface side of the tank unit mounting seat communicates the inside of the housing with the hydraulic oil storage tank chamber. A hydraulic power unit integrated with a tank.