JPH0547499U - Rotary pump unit - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to enable a filter to be easily replaced or washed in a rotary pump unit in which a valve body B and a rotary pump P are connected in series to a tank T in this order. That is. [Constitution] A cap 23 is detachably provided on a side surface of the valve body which is orthogonal to the connecting direction of the tank, the valve body and the rotary pump, and a filter is provided in a chamber 25 closed by the cap to rotate from the tank. The hydraulic fluid sucked into the pump is configured to pass through this filter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary pump unit that integrates a tank, a valve body, a rotary pump, and an electric motor.

[0002]

[Prior Art]

 As a rotary pump unit of this type, a device described in Japanese Utility Model Laid-Open No. 3-61175 is conventionally known. In this conventional rotary pump unit, a rotary pump is arranged between a tank containing an electric motor and a valve body containing a valve system, and a filter is built into this tank.

[0003]

[Problems to be solved by the device]

 This conventional unit has a problem that the filter cannot be removed unless the unit itself is disassembled at the time of filter replacement or cleaning, and the number of man-hours is increased accordingly. An object of the present invention is to provide a rotary pump unit that allows easy filter replacement and filter cleaning.

[0004]

[Means for Solving the Problems]

 This invention includes a tank, an electric motor built in the tank, a rotary pump connected to the electric motor, and a valve body having a valve system for controlling the discharge oil of the rotary pump. Also, a rotary pump unit that connects the valve body is assumed. Based on the above-mentioned rotary pump unit, the present invention provides a valve body, on the side surface of which is orthogonal to the connecting direction of the tank, the valve body and the rotary pump, a cap is detachably provided and is covered by this cap. The feature is that a filter is installed in the chamber and the hydraulic oil sucked from the tank to the rotary pump passes through this filter.

[0005]

[Action]

 Since this invention is constructed as described above, the filter can be taken out by removing the cap.

[Effect of the device]

 According to the rotary pump unit of this invention, since the cap does not interfere with the tank or the rotary pump, it can be easily removed. Therefore, the built-in filter can be easily replaced.

[0006]

【Example】

 The illustrated embodiment is an example of a rotary pump unit used for a single-acting cylinder, in which a valve body B is directly connected to an electric motor M, and a rotary pump P is connected to the valve body B. As shown in FIG. 2, the electric motor M has a tubular main body 1 covered with lid plates 2 and 3 on both sides. The electric motor M is built in the tank T. That is, the rotor 4 is rotatably supported between the lid plates 2 and 3, and the stator 5 fixed to the inner circumference of the main body 1 is positioned outside the rotor 4. Further, the one cover plate 3 is formed with a suction passage 7 communicating with a suction port 6 formed in the valve body B, and a return passage 9 communicating with a return port 8 also formed in the valve body B. is doing.

As shown in FIGS. 4 and 5, the valve body B has a shaft hole 10 that allows the motor shaft of the electric motor M to pass therethrough. The motor shaft penetrating the shaft hole 10 is connected to the drive shaft of the rotary pump P so that the rotary pump P can be operated by the drive force of the electric motor M. In addition to the suction port 6 and the return port 8, the valve body B has a supply port 11 for communicating the suction port 6 with the pump P and a discharge port 12 communicating with the discharge side of the rotary pump P 2. , And an actuator port 13 communicating with the single-acting cylinder C.

A check valve 15 that allows only the flow from the pump P to the single-acting cylinder C is provided in the flow path 14 that connects the discharge port 12 and the actuator port 13. A flow control valve 17 and a solenoid valve 18 are provided in a flow path 16 that branches from the flow path 14 and connects the actuator port 13 and the return port 8. The solenoid valve 18 is provided with a normal position (illustrated) that allows only the flow from the return port 8 to the actuator port 13 and a switching position that allows the flow from the actuator port 13 to the return port 8 to be a free flow. There is.

A filter 20 is provided in the flow path 19 connecting the suction port 6 and the supply port 11, and the filter 20 is replaceably housed as follows. That is, as shown in FIG. 4, a recess 21 is formed in the valve body B, and the suction port 6 and the supply port 11 are communicated with each other through the recess 21. A cap 23 is put on the opening side of the recess 21 with a seal 22 interposed therebetween, and the cap 23 is fixed to the side surface of the valve body B with a bolt 24. The filter 20 is provided in a chamber 25 formed by the recess 21 and the cap 23 in combination. The chamber 25 thus configured is orthogonal to the connecting direction of the tank T, the valve body B and the pump P, that is, the axial direction of the electric motor. Therefore, the cap 23 does not interfere with the tank T and the pump P, and the cap 23 can be easily attached and detached.

The filter 20 has a cylindrical shape with one end open and the other end closed, and its opening completely covers the inlet of the flow path 19 on the supply port 11 side, while the outer end of the filter 20 is closed. A spring 26 is interposed between the cap 20 and the cap 23 to prevent the filter 20 from coming off the inlet of the flow path 19. A flange 20a is formed around the opening of the filter 20, and the outer diameter of the flange 20a is made substantially equal to the inner diameter of the recess 21. Therefore, by inserting the flange 20a while aligning it with the recess 21 as shown in the figure, a passage 27 is formed between the inner periphery of the recess 21 and the periphery of the filter 20. This passage 27 communicates with the suction port 6 side. Reference numeral 28 in the figure is a relief valve for opening the valve when the pressure on the flow path 14 side becomes equal to or higher than a set pressure and returning the pressure oil to the tank T through the flow path 16. is there.

Next, the operation of this embodiment will be described. First, the case where the load W of the single-acting cylinder C is increased will be described. To increase the load W, the solenoid valve 18 is held in the normal position shown in the figure, and then the electric motor M is driven. When the electric motor M is driven, the rotary pump P operates, the working oil in the tank T flows into the suction port 6 via the suction flow passage 7, and also passes through the filter 20 from the passage 27 to the flow passage 19. Flow, from which it is sucked into rotary pump P via supply port 11. The pump P sucking the hydraulic oil discharges the pressure oil to the discharge port 12, and the discharged pressure oil is supplied to the single-acting cylinder C by pushing the check valve 15 of the flow passage 14 open. The load W increases. If the pump P is stopped after moving the load W to a desired position, the load W can be held at that position.

When the solenoid valve 18 is switched to the switching position to allow free flow from this load-holding state, the hydraulic oil in the single-acting cylinder C flows from the flow control valve 17 → the solenoid valve 18 → return port 8 → return flow path. It is returned to the tank T via 9. Therefore, the single-acting cylinder C is lowered by the load W or the action of its own weight. However, if the flow rate control valve 17 is adjusted at this time and the return flow rate at that time is controlled, the descending speed of the single-acting cylinder C can be adjusted.

Further, if the rotary pump unit is repeatedly used, dust or the like may be accumulated on the filter 20, which may cause clogging. In such a case, the bolt 24 can be loosened to remove the cap 23, and the filter 20 in the chamber 25 can be replaced. In particular, since the cap 23 does not interfere with the tank T or the pump P as described above, the attachment / detachment work thereof is extremely simple. In the above embodiment, the case where the single acting cylinder is used has been described, but it goes without saying that the double acting cylinder can also be used.

[Brief description of drawings]

FIG. 1 is a front view.

FIG. 2 is a partial cross-sectional view of an electric motor.

FIG. 3 is a side view of the electric motor.

FIG. 4 is a sectional view of a valve body.

FIG. 5 is a side view of the valve body.

FIG. 6 is a circuit diagram.

[Code]

 M Electric motor T Tank B Valve body P Rotary pump 20 Filter

Claims (1)

[Scope of utility model registration request] 1. A tank comprising: a tank; an electric motor built in the tank; a rotary pump connected to the electric motor; and a valve body having a valve system for controlling discharge oil of the rotary pump. In the rotary pump unit that connects the pump and the valve body,
The valve body is a side wall that is orthogonal to the connecting direction of the tank, valve body, and rotary pump, and a cap is detachably installed, and a filter is installed in the chamber closed by this cap, so that the suction pump is sucked from the tank. A rotary pump unit that allows oil to pass through this filter.