JP3216115B2 - Pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical housing having a pump and a strainer chamber provided in a box-shaped casing having an inlet and an outlet, and communicating with the spiral chamber on the discharge side of the pump in the strainer chamber. The present invention relates to a pump device in which a strainer is provided on an outer periphery of a member and a cylindrical member thereof, and the strainer is movable when the strainer is clogged.

[0002]

2. Description of the Related Art In general, a pump device for a weighing machine installed in a gas station or other gas station is a unit in which a strainer gas-liquid separation device on a pump inlet side and an outlet side is incorporated in a box-shaped casing. (For example, see Japanese Patent Application No. 7-140223 of the present applicant).

However, according to the prior art, when the strainer installed in the strainer chamber on the outflow side is clogged, the strainer moves and the oil flows out from the outlet through the bypass passage. In addition, there is a possibility that foreign matter may be mixed in the oil flowing out of the strainer by bypass.

In order to understand the disadvantages of the prior art and to clarify the features of the present invention, Japanese Patent Application No.
The technique proposed by No. 140223 will be described with reference to FIG. In FIG. 3, an inlet I and an outlet O are formed in a box-shaped casing C, and the inlet I is connected to a cylindrical inflow-side strainer chamber 1. The inflow-side strainer 2 is housed. The inflow-side strainer chamber 1 communicates with the flow path 7 on the inlet side of the pump 6 via the check valve 5, and the flow path 8 on the outlet side of the pump 6 communicates with the tangential direction of the spiral chamber 10. I have. The spiral chamber 10 has a cylindrical shape and communicates with a flow path 20 formed in the casing C via a small hole 13 a provided in one wall surface 13 of the spiral chamber 10. The other wall surface of the spiral chamber 10 communicates with the strainer chamber 17 via the tubular member 11. The gas-liquid separation device includes the spiral chamber 10, the cylindrical member 11, small holes 13a for outflow of the gas-liquid mixed flow, and a strainer 14 described later.

[0005] The strainer chamber 17 is formed in a cylindrical shape,
It communicates with the outlet O through the control valve 18,
The lower portion of the strainer chamber 17 communicates with the flow path 7 on the inlet side of the pump 6 via a bypass valve 19. And
A strainer 14 is provided in the strainer chamber 17, and the cylindrical member 11 is integrally formed on one flange 12b of the strainer 14 concentrically with the strainer 14, and the other end is closed by a lid 12a. Have been. A lid 15 is detachably provided on the outside of the casing C with bolts (not shown), and a spring 16 abuts and presses the lid 12a of the strainer 14 opposed thereto, and an opposite flange 12b is formed on the casing C. Seated on the seat.

On the opposite side of the spiral chamber 10 from the strainer chamber 17, a small hole 13a for outflow of the gas-liquid mixed flow is provided, and a flow path 20 communicating with the small hole 13a communicates with a float chamber 21. The float chamber 21 is provided with a float valve 22 which opens when oil accumulates to a level L, and an air vent V above the level L.
The outlet channel 23 of the float chamber 21 communicates with the inflow-side strainer chamber 1. Reference numeral 25 denotes a lid for closing the opening 24 for attaching the check valve 5.

In this device, oil from an underground tank (not shown) flows into the pump device from an inlet I, and dirt and the like is removed by an inflow-side strainer 2, and flows from a strainer chamber 1 through a check valve 5 to a flow path 7. From the pump 6. The oil pressurized by the pump 6 flows into the swirl chamber 10 from the flow path 8 to generate a swirling flow, and the gas-liquid mixture having a relatively low specific gravity flows into the float chamber 21 from the small hole 13a through the flow path 20. . Then, the oil which does not contain a gas having a relatively high specific gravity passes through the strainer 14, enters the strainer chamber 17, pushes and opens the control valve 18, flows to the outlet O, and is supplied from an oil supply nozzle (not shown). On the other hand, when the pump 6 is operated and oil is not supplied, the oil is returned from the strainer chamber 17 to the flow path 7 on the inlet side of the pump 6 through the bypass valve 19. The gas-liquid mixed flow flowing into the float chamber 21 is separated into a gas and a liquid here, and the gas is discharged from the air vent V. Then, the amount of oil in the float chamber 21 becomes level L
Is exceeded, the float valve 22 is opened and returned to the inlet side strainer chamber 1.

[0008] When the strainer 14 is clogged, the strainer 14 moves to the left in the drawing against the spring 16 due to the hydraulic pressure, so that the oil in the spiral chamber 10 flows directly to the outlet O. Therefore, clogging of the strainer 14 means outflow of foreign matter.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pump device which does not allow oil containing foreign matter to flow out to an outlet when a strainer is clogged.

[0010]

According to the present invention, a pump and a strainer chamber are provided in a box-shaped casing provided with an inlet and an outlet, and the pump and the strainer chamber are provided in the spiral chamber on the discharge side of the pump. In a pump device configured to provide a communicating tubular member, provide a strainer on the outer periphery of the tubular member, and move the strainer when the strainer is clogged,
A protruding end is provided on the spiral chamber side of the cylindrical member, a space is formed radially outward of the protruding end, and a flow path communicating the space with the suction side of the pump is provided.

Further, according to the present invention, the projecting end portion has a large-diameter portion and a small-diameter portion, and the space is provided radially outward of the small-diameter portion to seal the strainer chamber and the space. And a second seal for sealing the spiral chamber and the space when the strainer is not clogged.

Further, according to the present invention, a cover for taking out the strainer is provided on the casing, and the cover is provided with a cylindrical body for guiding a guide provided on the cover of the strainer.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In these drawings, the same parts as those in FIG. In addition, in FIG. 1, the inside of the inflow-side strainer 2 communicates with the inflow port I, and the check valve 5 also has a slightly different configuration. Since there is no direct relationship and the operation is the same, a difference in configuration is not particularly described.

1 and 2, a cylindrical protruding end 30 is provided on the spiral chamber 10 side of the cylindrical member 11, and this protruding end 30 is a large diameter portion on the strainer 14 side having a relatively large diameter. 31 and a small-diameter portion 32 on the side of the spiral chamber 10 having a relatively small diameter, so that the projecting end 30 has a shoulder 3 having a surface 33 perpendicular to the axis of the strainer 14.
4 are configured. A ring-shaped space 35 is formed radially outward of the small diameter portion 32 between the small diameter portion 32 and the casing C.

The space 35 is connected to the pump 6 through a flow path 36.
Is communicated with the flow path 7 on the entrance side of. The surface 33 is provided with a first seal 37 for sealing the space between the space 35 and the strainer chamber 17, and a radially outward portion of the small-diameter portion 32 when the strainer 14 is operating normally ( When not clogged), a second seal 38 is provided for sealing the spiral chamber 10 and the ring-shaped space 35, and the end of the small diameter portion 32 is engaged with the inner surface 39 of the casing C. are doing.

In the embodiment of FIG. 1, the strainer 14 is made integral with the cover 12a. As described later, the cylinder 12 moves to the left in FIG. 1 at the time of clogging. To guide the movement, a cylindrical guide portion 40 is provided on the cover 12a. Is provided with a cylindrical body 41 for guiding the guide section 40.

Therefore, when the strainer 14 is clogged, the pressure inside the strainer 14 increases, and the strainer 14 moves to the left in FIG. that time,
The guide portion 40 on the left side of the strainer 14 is guided by the cylindrical body 41, and the first seal 37 on the right side is guided by the inner surface of the casing radially outward, so that the end of the small diameter portion 32 and the second seal 38 leaves the surface 39 of the casing. Then, the high-pressure oil in the volute 10 flows into the space 35,
It is sucked into the pump 6 via the flow path 36. Space 35
Is connected to the flow path 7 on the inflow side of the pump 6 through the flow path 36 and becomes a negative pressure. Therefore, the first seal 37 is provided so that the oil from the strainer chamber 17 does not flow backward.

As described above, according to the present invention, the strainer 1
At the time of clogging of 4, a part of the discharge oil from the pump 6 circulates through the flow path 36 from the space 35 to the suction side of the pump 6, and releases the hydraulic pressure. There is no outflow from the outlet O. Then, when the amount of oil discharge decreases, the lid 15 may be removed from the casing C, and the strainer 14 may be cleaned or replaced.

[0019]

As described above, according to the present invention, when the strainer is clogged, a part of the oil from the pump circulates and the hydraulic pressure in the strainer drops, so that the oil containing foreign matter flows out of the outlet. No ejection from O. Therefore, it is always possible to supply only oil free of foreign matter.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the present invention.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 6 pump 10 spiral chamber 11 cylindrical member 12a cover 14 strainer 15 lid 16 spring 17 strainer chamber 30 projecting end Part 31 ・ ・ ・ Large diameter part 32 ・ ・ ・ Small diameter part 33 ・ ・ ・ Surface perpendicular to axis 35 ・ ・ ・ Space 36 ・ ・ ・ Flow path 37 ・ ・ ・ First seal 38 ・ ・ ・ Second seal 39: inner surface of casing 40: guide portion 41: cylindrical body

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-324699 (JP, A) JP-A-5-193697 (JP, A) JP-A 8-326665 (JP, A) JP-A 8- 200034 (JP, A) Japanese Utility Model Showa 57-92887 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B67D 5/58

Claims (3)

(57) [Claims] 1. A pump and a strainer chamber are provided in a box-shaped casing having an inlet and an outlet, and a cylindrical member communicating with a spiral chamber on the discharge side of the pump is provided in the strainer chamber. In a pump device in which a strainer is provided on the outer periphery of the cylindrical member and the strainer is movable when the strainer is clogged, a projecting end is provided on the spiral chamber side of the cylindrical member, and a space is provided radially outward of the projecting end. And a flow passage communicating the space with the suction side of the pump is provided. 2. A first seal comprising a large diameter portion and a small diameter portion, wherein the space is provided radially outward of the small diameter portion to seal a strainer chamber and the space, and a strainer. The pump device according to claim 1, further comprising a second seal that seals the spiral chamber and the space when is not clogged. 3. A cover for taking out the strainer is provided on the casing, and the cover is provided with a cylindrical body for guiding a guide portion provided on the cover of the strainer.
A pump device as described.