JP2023013665A - Tank integrated pump - Google Patents

Abstract

To provide a tank integrated pump which can preferably discharge air accumulating in a bearing chamber even if the tank is used placed in a lateral or vertical direction, enables the pump to be used in various devices, and reduces costs.SOLUTION: A configuration of a tank integrated pump 100 according to the invention includes: a pump 110 which sends a working fluid; a tank 140 in which the working fluid is stored; and a head 120 disposed between the pump 110 and the tank 140. The head 120 includes: a suction port 122 which suctions the working fluid into the pump 110; a bearing chamber 132 which houses a head side bearing 118 of the pump 110; and an air bleeding duct 136 which allows the bearing chamber 132 and the suction port 122 to communicate with each other. Air accumulating in the bearing chamber 132 is suctioned into the pump 110 through the air bleeding duct 136 or discharged into the tank 140 by buoyancy force of the air.SELECTED DRAWING: Figure 1

Description

The present invention relates to a tank-integrated pump that is integrated with a tank.

2. Description of the Related Art Conventionally, there has been known a tank-integrated pump in which a pump used as a hydraulic source for industrial machines and the like and a tank for storing hydraulic oil are integrated (for example, Patent Document 1). In the tank-integrated piston pump of Patent Document 1, tanks are arranged in the left-right direction of the pump. According to Patent Document 1, the front case is expanded in the radial direction to serve as both the pump case and the outer peripheral wall of the tank, and in addition, the rear flange is added to the rear case to secure the tank capacity. It is possible to simplify the process, increase the capacity, and reduce the thickness and weight of the pump case, while preventing the hydraulic oil in the tank from becoming cloudy. Further, in Patent Document 1, the tank-integrated piston pump is a so-called horizontal type in which the tank is arranged in the horizontal direction of the pump, but there is also a vertical type in which the tank is arranged above the pump.

JP 2005-36744 A

Generally, in a tank-integrated pump, the tank and the pump are connected by a head. A bearing chamber is formed in the head, and the bearing chamber is accommodated in the head-side bearing of the pump. If air stays in the bearing chamber, the working oil will not be properly supplied to the head side bearing, and there is a risk that seizure will occur in the head side bearing.

Here, the tank-integrated pump is often assumed to be of the horizontal type as in Patent Document 1. In such a case, the air remaining in the bearing chamber is discharged from the drain port located above the pump. However, if a horizontal-type tank-integrated pump is used vertically, the drain port will be arranged below the bearing. As a result, air is not discharged, and seizure of the head-side bearing described above is likely to occur.

In view of such problems, the present invention can suitably discharge the air accumulated in the bearing chamber even when it is used horizontally or vertically, so that the pump can be shared and the cost can be reduced. The purpose is to provide a tank-integrated pump capable of

In order to solve the above problems, a typical configuration of the tank-integrated pump according to the present invention includes a pump that delivers hydraulic oil, a tank that stores the hydraulic oil, and a head that is arranged between the pump and the tank. The head includes a suction port for sucking hydraulic oil into the pump, a bearing chamber for housing the head-side bearing of the pump, and an air release pipe communicating from the bearing chamber to the suction port. , and the air remaining in the bearing chamber is sucked into the pump through the air release pipe or discharged into the tank by the buoyancy of the air.

It is preferable that the air vent line is connected to a drain port that communicates from the internal space of the pump to the suction port, and that the air vent line communicates with the suction port via the drain port.

According to the present invention, even when used horizontally or vertically, it is possible to suitably discharge the air that has accumulated in the bearing chamber, and the tank-integrated type is capable of standardizing the pump and reducing the cost. A pump can be provided.

It is a figure explaining the tank integrated pump concerning this embodiment. FIG. 2 is a partial cross-sectional view of the head of FIG. 1 as seen from the front; 2 is an enlarged view of the vicinity of the head in FIG. 1; FIG.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are illustrated or described. is omitted.

FIG. 1 is a diagram illustrating a tank-integrated pump 100 according to this embodiment. FIG. 2 is a partial cross-sectional view of the head of FIG. 1 as viewed from the front. FIG. 3 is an enlarged view of the vicinity of the head 120 in FIG. In particular, FIG. 3(a) illustrates a case where the tank-integrated pump 100 is installed horizontally, and FIG. 3(b) illustrates a case where the tank-integrated pump 100 is installed vertically.

As shown in FIG. 1, the tank-integrated pump 100 of this embodiment includes a pump 110 that delivers hydraulic oil, a head 120 that is arranged between the pump and the tank, a tank 140 that stores the hydraulic oil, and an end cover. 150 (see FIG. 4). That is, in the tank-integrated pump 100 , the pump 110 and the tank 140 are connected by the head 120 .

A cylinder barrel 113 that is rotatably supported together with a shaft 112 (shaft) is arranged in a case 111 of the pump 110 . A plurality of piston holes are formed in the cylinder barrel 113, and a plurality of axially slidable pistons 114 are inserted therein. The swash plate 115 is slanted with respect to the shaft 112 . The head of the piston 114 is fitted in the shoe 116 of the swash plate 115 . When the shaft 112 is rotationally driven, the cylinder barrel 113 rotates, and the piston 114 reciprocates with respect to the cylinder barrel 113 due to the inclination of the swash plate 115 . As a result, the hydraulic oil can be continuously sucked into and discharged from the cylinder.

The shaft 112 is supported by a motor-side bearing 117 on the motor side (not shown) of the cylinder barrel 113 and by a head-side bearing 118 on the head side of the cylinder barrel 113 .

Pump 110 sucks hydraulic oil stored in tank 140 from suction port 122 provided in head 120 . Hydraulic oil sucked from the suction port 122 passes through the suction pipe 124 and is supplied to the inside of the pump 110 .

As shown in FIG. 2, suction line 124 is connected to two kidney ports 126 via two check valves 170 (check valves). The pump 110 is a bi-directional rotary pump, and by switching the direction of rotation of the cylinder barrel 113, one of the two kidney ports 126 is sucked and the other is discharged. The two check valves 170 are hydraulically open on the suction side and not on the discharge side.

Two discharge ports 162 are connected to the two kidney ports 126 . The two discharge ports 162 are connected to a hydraulic device (not shown) such as a cylinder via a valve block 160, and hydraulic fluid is delivered from the discharge port 162 connected to the kidney port 126 on the discharge side. Hydraulic oil that has returned from the hydraulic equipment returns to the tank 140 through the return pipe 127 . The return pipe 127 is connected from the check valve 170 to the tank 140 side.

Tank 140 is attached to pump 110 via head 120 . The tank 140 is a generally cylindrical member (either cylindrical or rectangular) and is arranged to enclose the intake port 122 (covering the intake port 122). Tank 140 is sealed at one end by head 120 and at the other end by end cover 150 .

Further, as shown in FIG. 3(a), the head 120 is provided with a bearing chamber 132, a drain port 134 and an air vent pipe line 136. As shown in FIG. The bearing chamber 132 houses the head-side bearing 118 of the pump 110 . Drain port 134 communicates from internal space 119 of pump 110 to suction port 122 . The head 120 of the tank-integrated pump 100 of this embodiment is formed with an air vent pipe 136 communicating from the bearing chamber 132 to the drain port 134 .

Since the air vent pipe 136 communicates with the suction port 122 through the drain port 134, when the pump 110 is operated, the air remaining in the bearing chamber 132 is discharged through the air vent pipe 136 and the drain port 134 to check. It is drawn into pump 110 via valve 170 . In this manner, when the tank-integrated pump 100 is installed sideways, the air remaining in the bearing chamber 132 can be removed.

Even when the tank-integrated pump 100 is used vertically as shown in FIG. It is drawn into pump 110 via valve 170 . Therefore, in the tank-integrated pump 100 of the present embodiment, even when mounted vertically, the air remaining in the bearing chamber 132 can be preferably discharged.

Furthermore, since the air vent pipe 136 is connected to the upstream side of the check valve 170, it is expected that the buoyancy of the air bubbles will cause them to escape from the drain port 134 to the tank 140 via the suction port 122 in the case of vertical installation. be able to. Therefore, in the case of vertical mounting, even when the pump 110 is not in operation and the check valve 170 is closed, the air remaining in the bearing chamber 132 can be released. As a result, it is possible to suitably prevent air entrapment during start-up caused by a large amount of air remaining in the cylinder barrel 113 of the pump 110 and damage to the pump 110 caused thereby.

As described above, according to the tank-integrated pump 100 of the present embodiment, in both horizontal use and vertical use, the air remaining in the bearing chamber 132 is mixed with the hydraulic oil. The hydraulic oil is sucked into the pump 110 through the extraction pipe 136 and discharged to the outside of the pump 110 together with the working oil. As a result, seizing of the head-side bearing 118 due to insufficient supply of hydraulic oil can be preferably prevented. In addition, the integrated pump 110 can be commonly used for both horizontal and vertical installation, and cost can be reduced.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used as a tank-integrated pump integrated with a tank.

DESCRIPTION OF SYMBOLS 100... Tank integrated pump, 110... Pump, 111... Case, 112... Shaft, 113... Cylinder barrel, 114... Piston, 115... Swash plate, 116... Shoe, 117... Motor side bearing, 118... Head side bearing, 119 Internal space 120 Head 122 Suction port 124 Suction pipe 126 Kidney port 127 Return pipe 132 Bearing chamber 134 Drain port 136 Air release pipe 140 Tank 150... End cover, 160... Valve block, 162... Discharge port, 170... Check valve

Claims (2)

a pump for delivering hydraulic oil;
a tank that stores hydraulic oil;
An integrated tank pump including a head positioned between the pump and the tank,
The head includes
a suction port for sucking hydraulic oil into the pump;
a bearing chamber housing a head-side bearing of the pump;
an air vent pipe communicating from the bearing chamber to the suction port;
with
A tank-integrated pump, wherein air remaining in the bearing chamber is sucked into the pump through the air release pipe or discharged into the tank by buoyancy of the air. The air vent pipeline is
connected to a drain port that communicates from the internal space of the pump to the suction port,
2. The tank-integrated pump according to claim 1, wherein the air vent pipe communicates with the suction port via the drain port.

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