JPS6115265Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a pump unit used in oil supply equipment, etc.
In particular, the present invention relates to improvements in pump units in which a pump chamber, a filter chamber, an air separator chamber, etc. are provided within the casing.

2. Description of the Related Art Conventionally, pump units have been known in which a pump chamber, a filter chamber, an air separator chamber, etc. are provided in one casing. In this pump unit, an oil return passage connected to the suction side of the pump chamber is opened in the lower part of the air separator chamber, and an air relief passage is provided on the upper wall surface of the air separator chamber, for example, so that the pump unit can be operated. Some have good processability. However, because the oil return passage and the air relief passage face each other, if the flow in the pump main passage is stopped (for example, if the fluid is connected to the fluid discharge port of the pump unit via a flowmeter, piping, or hose). When the oil supply nozzle valve is opened), the so-called water hammer phenomenon causes the oil to flow backwards through the oil return passage and squirt into the air separator chamber, and its force causes it to squirt outside from the air relief passage. Sometimes I end up doing it. This tendency is particularly severe in pump units with large pump capacities.

Therefore, a method can be considered in which the air relief passage is formed on a wall surface other than the above-mentioned opposing wall surface apart from the oil liquid return passage, such as a side wall surface, and the phase of the passage and the oil liquid return passage is shifted by 90 degrees. Not only is it not perfect for preventing oil from spewing out from the air escape passage in the air separator chamber to the outside due to the water hammer phenomenon, but this type of pump unit also suffers from the workability problems mentioned above, namely, air leakage. In order to provide the escape passage on the side wall surface, it is necessary to add one more machined surface to the casing, which causes a problem that machining becomes troublesome.

The purpose of the present invention is to provide a pump unit that solves the above problems.An air relief passage is provided on the wall of the air separator chamber facing the oil return passage, and the air relief passage and the oil return passage are connected to each other. By interposing a shielding plate between them, it is possible to prevent the oil from ejecting to the outside from the air relief passage without reducing the machinability of the casing.

The present invention will be described in detail below with reference to the illustrated embodiments.

In FIGS. 1 to 7, 1 is a casing, which is formed into a hexahedron. Two opposing surfaces of the casing 1, here both side surfaces 1A and 1B, are the surfaces to be chucked, and as shown in FIG. 4, a fluid suction port 2 is opened on the lower surface 1C of the casing 1, and Then, the fluid discharge port 3 is opened in the upper surface 1D of the casing 1. 4 is a suction pipe attached to the fluid suction port 2.

As shown in FIGS. 5 and 6, the casing 1
A pump chamber 5 is provided inside the pump chamber 5, a machined hole 6 of the pump chamber 5 is provided in the front surface 1E of the casing 1, and the hole 6 is covered with a removable cover member 7. A pump shaft 8 is provided inside and outside the pump chamber 5 by penetrating the lid member 7, and an eccentric rotor 10 equipped with vanes 9, 9, which can move in the radial direction is attached to the outer periphery of the shaft 8 on the pump chamber 5 side. A pump pulley 11 is attached to the outer end of the pump. 12,
Reference numerals 13 denote a suction port and a discharge port that open into the pump chamber 5, respectively.

As shown in FIGS. 4, 6, and 7, a strainer chamber 14 and a check valve chamber 15 are provided in the casing 1 to communicate the pump chamber 5 and the fluid suction port 2. The strainer chamber 14 and the check valve chamber 15 communicate through a communication hole 16A opened in the partition wall 16,
A strainer chamber 14 faces the fluid discharge port 2, and a check valve chamber 15 faces the suction port 12 of the pump chamber 5.
A machined hole 17 for the strainer chamber 14 is provided on the rear surface 1F of the casing 1, and a strainer 18 is inserted into the strainer chamber 14 through the machined hole 17, and is fitted and fixed into a support hole 14A formed on the inner wall of the chamber 14. . A lid member 19 is removably screwed into the processed hole 17. 20 is a spring that prevents the strainer 18 from coming off.

A machined hole 21 for the check valve chamber 15 is provided in the front surface 1E of the casing 1, and a check valve 22 is inserted into the check valve chamber 15 from the machined hole 21 facing the strainer 18, and the valve seat member 23 is inserted into the check valve chamber 15. is fitted into the communication hole 16A. A valve support shaft 23A is fixed to the valve seat member 23, and a valve member 24 is slidably fitted into the valve support shaft 23A. A lid member 25 is removably screwed into the processed hole 21, and the lid member 25 and the valve member 2
A spring 26 is tensioned between the valve member 4 and the valve member 24 to bias the valve member 24 in the direction of blocking the inflow. Here, in order to facilitate the machining of the machined hole 17, the support hole 14A, the communication hole 16A, and the machined hole 21, each of the machined holes 17, 14A, 16
A and 21 are provided coaxially. Further, the valve support shaft 23A is formed in a cylindrical shape, and when the valve member 24 is fitted, the end of the valve support shaft 23A and the valve member 24 are connected to each other.
Air is trapped between the two and prevents it from acting as a damper.

As shown in Figures 1 and 4 to 6,
A filter chamber 2 is provided between the pump chamber 5 and the fluid discharge port 3.
7 is provided, the filter chamber 27 and the discharge port 13 of the pump chamber 5 are communicated via the chamber 28, and the filter chamber 2
7 and the fluid outlet 3 are communicated through passages 29 and 29'. A machined hole 30 for the filter chamber 27 is provided on the rear surface 1F of the casing 1, and after inserting the filter 31 through the hole 30, as shown in FIG.
The hole 30 is covered with a removable cover member 32.

As shown in FIGS. 2 and 6, the passage 29 and the passage 29' are opened at the upper surface 1D of the casing 1, and a check valve 35 is inserted into the passage 29 from the opening 33.
The lid member 3 is capable of inserting the opening 33 and removing the opening 33.
Close the lid at 4. 35A is a spring that biases the check valve 35.

As shown in FIGS. 5 and 7, the filter chamber 2
An air separator chamber 36 is provided between the check valve chamber 15 and the check valve chamber 15.
A machined hole 37 for the air separator chamber 36 is provided on the rear surface 1F of the casing 1, and the hole 37 is covered with a removable cover member 38, as shown in FIG. As shown in FIGS. 4 and 5, a lid member 39 is removably attached to the upper surface 1D of the casing 1, and the filter chamber 27 and the air separator chamber 36 are communicated through a passage 40 formed in the lid member 39. let In this case, a passage 41 that communicates between the filter chamber 27 and the passage 40 is provided on the upper surface 1D of the casing 1, and a passage 42 that communicates between the passage 40 and the air separator chamber 36 is provided.

As shown in FIGS. 5 and 7, the casing 1
An oil liquid return passage 43 is provided on the rear surface 1F.
3 is opened upward from the lower part in the air separator chamber 36, and a float 44 is provided in a floating manner in the air separator chamber 36, and on the float 44,
A valve 45 that opens and closes the passage 43 in conjunction with the float 44 is attached. A passage 46 is formed in the lid member 38 for communicating the passage 43 and the check valve chamber 15.

As shown in FIGS. 1, 2, 5, and 7, a relief valve 47 is attached to the front surface 1E of the casing 1, and the chamber 28 and check valve chamber 15 are
communicate with. In this case, the front surface 1E of the casing 1 is provided with a passage 49 that communicates the chamber 28 with the passage 48 of the relief valve 47, and a passage 50 that communicates the passage 48 with the check valve chamber 15. A valve body 51 is incorporated in the flow path 48, and when the internal pressure of the chamber 28 reaches a certain level or more, the valve body 51 is activated by the spring 5.
It opens against the spring force of 2.

In FIGS. 1, 2, and 5, air communicating between the air separator chamber 36 and the atmosphere is provided on the wall surface of the air separator chamber 36 facing the opening 43A of the oil return passage 43, that is, on the upper surface 1D of the casing 1. A relief passage 53 is provided, and a blocking plate 54 is interposed between the air relief passage 53 and the oil return passage 43. This shielding plate 54 can be formed integrally with the side wall 1F of the casing 1. Note that it is preferable to provide the air relief passage 53 on the top surface 1D since the oil in this area will drip, but it is preferable to provide it on the side surface 1F.
, that is, on the top of the lid member 38.

In addition, in FIG. 1, 55 is a screw hole for attaching a flow meter (not shown) or the like.

In the pump unit configured as described above, when the pump pulley 11 is rotated clockwise in FIG. 2 by a motor (not shown), the eccentric rotor 10 is rotated in the same direction together with the pump shaft 8, causing eccentric movement of the rotor As a result, a volume change occurs in the chamber formed by the rotor 10, the vanes 9, and the inner surface of the casing 1, and the oil fluid moves. At this time, due to the suction pressure generated on the suction port 12 side of the pump chamber 5,
The valve member 24 opens against the spring force of the spring 26, and the oil in the oil supply tank (not shown) connected to the suction pipe 4 is sequentially pumped through the suction pipe 4, the fluid suction port 2, the strainer chamber 14, and the strainer. 18, the check valve 22, the check valve chamber 15, and then the pump suction port 12, and from the pump discharge port 13, the chamber 28, the filter chamber 27, the filter 31, the passage 29, the check valve 35, and the passage 29'.
The fluid is then discharged to the outside from the fluid discharge port 3, and is sent to the oil supply nozzle via a flow meter and the like. Note that the check valve 35 prevents the oil from flowing back through the flowmeter when oil is not being supplied.

Also, to explain the gas-liquid separation process of the above-mentioned device, the oil containing gas accumulates above the filter chamber 27 and is sent to the air separator chamber 36 through the passage 41, passage 40, and passage 42 in order. The gas and the oil are separated in the chamber 36, the gas is released to the atmosphere from the air release passage 53, and the oil remains in the air separator chamber 36. When the oil liquid accumulates above a certain level, the float 44 floats up, and the valve 45 attached to the float 44 opens to open the oil return passage 43. Therefore, the oil is sequentially passed through the passage 43 and the passage 46.
It is then circulated through the check valve chamber 15 to the suction port 12 of the pump chamber 5 again.

After the pump is activated, when actual refueling is not performed, the internal pressure in the chamber 28 increases, so the relief valve 47 is closed.
The valve body 51 opens against the force of the spring 52, and the oil discharged from the pump outlet 13 is circulated to the pump suction port 12 through the chamber 28, the relief valve 47, and the check valve chamber 15 in this order.

When the pump is stopped, the valve member 24 closes, so the oil in the oil supply pipe between the check valve chamber 15, the strainer chamber 14, and the oil supply tank flows down into the oil storage tank (not shown). Never. Therefore, the subsequent pumping operation of the oil liquid is performed smoothly.

Also, if the refueling nozzle is suddenly closed, the valve member 2
4 is closed, and at this time, a water hammer phenomenon occurs due to the reaction of the oil that has no place to go, and the oil moves from the pump suction port 12 side of the check valve chamber 15 to the passage 46 side of the check valve chamber 15. The oil flows backward and is ejected from the opening 43A of the oil return passage 43. The air release passage 53 is located opposite the opening 43A, but since the shielding plate 54 is located between the opening 43A and the air release passage 53, the air emitted from the opening 43A There will be no problem that the oil liquid will fly into the air relief passage 53 with its force and further be spouted to the outside.

In the pump unit having the above configuration, the casing 1 is formed into a hexahedral shape, and the pump chamber 5 and the strainer chamber 1 are arranged in a hexahedral shape.
4. The machined holes of each of the check valve chamber 15, filter chamber 27, and air separator chamber 36, the fluid suction port 2, the fluid discharge port 3, and the air release passage 53 are connected to two opposing surfaces of the casing 1 (here, the side surfaces). 1A,
1B), so when processing the casing 1, the processing can be completed by performing four-sided processing with the two opposing sides of the casing 1 chucked by the processing machine. can. Therefore, the trouble of removing and repositioning the casing 1 during processing is eliminated, and production efficiency is significantly increased. Moreover, since there is no need to perform any processing on the two opposing surfaces,
Processing man-hours are reduced.

As described above, the present invention interposes a shielding plate between the oil return passage at the lower part of the air separator chamber and the air relief passage at the upper part, so by making some changes to the casting shape of the casing, The water hammer phenomenon that occurs every time the flow path on the downstream side of the pump is abruptly blocked (for example, every time the nozzle valve of the refueling nozzle is closed) without reducing the machinability of the casing. This makes it possible to prevent the oil from leaking out from the air relief passage in the air separator chamber, making it possible to provide a highly safe pump unit at a low cost. In addition, by installing a shutoff valve in the air separator chamber, when the refueling nozzle is suddenly closed, the discharge side of the pump chamber is subject to instantaneous fluid pressure of 5 kg/cm ² or more due to the water hammer phenomenon that occurs. This reinforces the filter chamber and the like adjacent to the air separator chamber, which also has the effect of increasing the rigidity of the entire casing of the pump unit. Particularly, when the oil liquid is a dangerous substance such as gasoline, the effect of the present invention is great.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a pump unit showing an embodiment of the present invention. FIG. 2 is a partially cutaway front view of FIG. 1. FIG. 3 is a rear view of FIG. 1. FIG. 4 is a sectional view taken along the - line in FIG. 2. FIG. 5 is a sectional view taken along the - line in FIG. 2. FIG. 6 is a sectional view taken along the - line in FIG. 5. Figure 7 is - in Figure 5.
Line sectional view. 1...Casing, 5...Pump chamber, 36...
Air separator chamber, 43...Oil liquid return passage, 43
A... Opening, 53... Air relief passage, 54...
Blocking board.

Claims (1)

[Scope of utility model registration request] A pump chamber, a filter chamber, and an air separator chamber are provided in the casing, and a lower part of the air separator chamber into which the oil containing gas discharged from the discharge side of the pump chamber flows from the filter chamber,
An oil liquid return passage connected to the suction side of the pump chamber is opened, and an air relief passage is provided in the upper part of the air separator chamber, and an air relief passage is provided in the air separator chamber between the air relief passage and the oil liquid return passage. 1. A pump unit, characterized in that a shielding plate is provided to prevent the oil liquid flowing back through the oil return passage from ejecting from the air escape passage due to a water hammer phenomenon that occurs when oil supply is stopped.