JP3644550B2 - Inflow channel structure of pump device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an inflow channel structure of a pump device for a measuring machine installed in a gas station such as a gas station.
[0002]
[Prior art]
In general, a pump device used in a weighing machine has a box-shaped casing, oil that has flowed into the casing from the inflow path is pressurized by the pump, and oil that does not contain gas separated by the gas-liquid separator is from the outlet. The gas-liquid mixed liquid containing the gas flowing out is sent to the float chamber, the gas is discharged from the air vent, and the liquid is returned to the pump (see, for example, Japanese Utility Model Publication No. 61-15265).
[0003]
A strainer is provided in an inflow path of such a pump device in order to capture foreign matter in the oil. Since this strainer is removed and cleaned when foreign matter accumulates, it is detachably provided.
[0004]
However, for example, the known technique disclosed in the above publication requires a spring for mounting the strainer, and the mounting work is troublesome. In addition, a check valve is provided on the downstream side of the strainer to prevent the oil in the casing from flowing out when the strainer is cleaned. The structure is complicated because it closes at.
[0005]
Furthermore, in the technology described in Japanese Patent Publication No. 5-50593 related to the present applicant, since a check valve is provided on the upstream side of the strainer, a large amount of oil in the casing is discharged when the strainer is cleaned. There must be.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide an inflow path structure of a pump device that can be easily attached with a strainer and can minimize an oil outflow amount during cleaning.
[0007]
[Means for Solving the Problems]
According to the present invention, an inflow channel structure of a pump device in which a pump (6) is housed in a box-shaped main casing (C) and a strainer (2) is provided in the inflow channel (I) to the pump (6). The strainer casing (C1) is provided integrally with the main body casing (C), and the inflow passage (I) is formed vertically from the lower side in the strainer casing (C1), and is horizontal to the inflow passage (I). The strainer chamber (1) is formed by communication with the chamber (7) from the strainer chamber (1) through the check valve (5), and communicates with the strainer chamber (1). Is formed with a seat (1a) that engages with the end of the strainer (2) on the inflow passage side, the other end is opened, and the strainer (2) is inserted through the opening (1b) to close the opening (3 ) To the seat (1a) The strainer (2) is cylindrical, the lid side is closed by an end plate (2a), the other end pressed against the seat (1a) is opened (2b), and the opening (2b) On the side, a weir (2c) is provided over the entire circumference, and the check valve (5) is configured to be gravitational and detachable in the vertical direction. In order to mount the check valve (5), a strainer casing (C1 ) Is provided with an opening (24) and is always closed by a lid (25).
[0010]
[Action]
Therefore, the oil flowing into the inflow passage of the casing enters the strainer chamber inside the strainer casing, flows radially outward, and pushes up the check valve against its own weight and flows into the chamber on the inlet side of the pump. .
[0011]
During cleaning, when the lid is loosened and the sealing performance is lost, the oil in the strainer chamber flows out to the underground tank side from the inflow passage, and the oil that flows out when the lid is removed is small, and the treatment is easy. Can be done. Then, the strainer is taken out and cleaned, and then the strainer is inserted and the lid is closed.
[0012]
Therefore, it is sufficient to simply insert the strainer and close the lid, and it is not necessary to hold the strainer with a spring or the like. Therefore, the mounting is easy and the cleaning work is easy.
[0013]
In addition, since the check valve is closed by its own weight, the structure is simplified.
[0014]
Furthermore, by forming the strainer into a cylindrical shape and providing a weir at the open end, it is possible to prevent the trapped foreign matter from being caught on the weir and flowing out to the underground tank side.
[0015]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
In FIG. 1, a pump device for a weighing machine embodying the present invention includes a box-shaped main body casing C and a strainer casing C1 formed integrally with the main body casing C. The strainer casing C1 has an inflow path I. The main body casing C is formed with an outflow path O, respectively. The inflow path I communicates with the strainer chamber 1, and the strainer chamber 1 stores the strainer 2, and the strainer chamber communicates with the chamber 7 on the inlet side of the pump 6 through the check valve 5. The chamber 8 on the outlet side of the pump 6 communicates with a gas-liquid separator denoted by reference numeral 9 as a whole.
[0017]
In this example, the gas-liquid separation device 9 described in Japanese Patent Application Laid-Open No. 5-193977 is used. The spiral chamber 10, the cylindrical member 11, the anti-rotation member 12, and its cylinder are used. It comprises a gas-liquid mixed flow passage 13 provided on the opposite side of the swivel stop member 12 with respect to the member 11. In this gas-liquid separation device 9, as described in the above publication, the swirl flow generated in the spiral chamber 10 flows toward the swivel stop member 12 while swirling the cylindrical member 11, but the relatively light gas-liquid mixed flow is They gather at the center of the spiral chamber 10 and the cylindrical member 11 and flow out of the gas-liquid mixing channel 13.
[0018]
A strainer 14 is provided outside the cylindrical member 11 in the radial direction. The strainer 14 is positioned via a spring 16 and the anti-rotation member 12 by a lid 15 attached to the outside of the casing C.
[0019]
A radially outer chamber 17 of the strainer 14 communicates with an outlet O through a control valve 18 at an upper portion thereof, and communicates with a chamber 7 on the inlet side of the pump 6 through a bypass valve 19 at a lower portion thereof. ing.
[0020]
The gas-liquid mixed flow passage 13 communicates with a float chamber 21 via a passage 20, and a float valve 22 is provided in the float chamber 21. The float valve 22 is opened when oil is accumulated up to a level L in the float chamber 21. Therefore, the air vent V is provided above the level L. The outlet channel 23 of the float chamber 21 communicates with the strainer chamber 1.
[0021]
The check valve 5 is a gravity type, and an opening 24 is opened in the strainer casing C1 in order to attach the check valve 5, and the opening 24 is always closed by a lid 25.
[0022]
2 and 3, the inflow path I is formed vertically from the lower side of the strainer casing C1, and the strainer chamber 1 communicates with the inflow path I horizontally. A seat 1a that engages with an end of the strainer 2 is formed on the inflow path I side of the strainer chamber 1, and an opening 1b is formed on the other end. A lid 3 for closing the opening 1b is provided, and the strainer 2 is inserted into the strainer chamber 1 through the opening 1b, and an end portion is pressed against the seat 1a by the lid 3 and is brought into close contact therewith.
[0023]
In FIG. 4, the strainer 2 is cylindrical and the lid 3 side is closed by an end plate 2a, and an opening 2b is formed on the side seated on the seat 1a. On the side of the opening 2b, a weir 2c for preventing foreign matter outflow is formed over the entire circumference.
[0024]
Next, the operation will be described mainly with reference to FIG.
[0025]
Oil from an underground tank (not shown) flows into an inflow path I through an oil supply pipe (not shown), and dust and the like are removed by the strainer 2, and the chamber 7 on the inlet side of the pump 6 passes through the check valve 5 from the strainer chamber 1. And is sucked into the pump 6. Oil pressurized by the pump 6 flows into the spiral chamber 10 of the gas-liquid separator 9 from the outlet-side chamber 8 to generate a swirling flow, and a relatively light gas-liquid mixed flow passes through the gas-liquid passage 13 to the passage 20. Through the float chamber 21.
[0026]
The oil containing no gas passes through the strainer 14, pushes the control valve 18 open, flows into the outflow passage O, and is supplied from an oil supply nozzle (not shown).
[0027]
When the pump 6 is operating but not supplied with oil, the oil from the pump 6 passes through the bypass valve 19 and is returned to the inlet side chamber 7 for circulation.
[0028]
The gas-liquid mixed liquid flowing into the float chamber 21 is separated here, and the gas, that is, the vapor, is released from the air vent V to the atmosphere. When a certain amount of oil in the float chamber 21 is accumulated, the float valve 22 is opened, and the oil in the float chamber is returned from the passage 23 to the underground tank through the strainer 2 through the strainer 2. If the pump 6 is operating, it is sucked into the pump 6.
[0029]
In this way, when the float valve 22 is opened, the oil in the float chamber 21 can flow out to the underground tank through the strainer 2, so that the oil flows back from the float valve 22 into the float chamber 21 by the water hammer when the meter is not used. However, it can flow out directly and the float chamber 21 is not filled with oil.
[0030]
The strainer 2 can be attached simply by inserting the strainer 2 into the strainer chamber 1 and closing the lid 3 so that the opening 2b is in close contact with the seat 1a.
[0031]
Further, when the strainer 2 is clogged with foreign matter, the lid 3 is removed and the strainer 2 is taken out. At that time, when the lid 3 is loosened and the sealing performance is lost, the flow path of the strainer chamber 1 is closed by the check valve 5 and the float valve 22, so that the oil in the strainer chamber 1 flows out into the underground tank, The oil outflow when the lid 3 is removed is minimized.
[0032]
【The invention's effect】
As described above, the present invention has the following excellent effects.
[0033]
(1) Opening the lid, taking out the strainer, and inserting the strainer to close the lid makes it easy to attach and detach the strainer during cleaning.
[0034]
(2) Since there is a check valve on the downstream side of the strainer, the oil in the strainer chamber flows into the underground tank when the lid is loosened, and when the lid is removed, almost no oil remains, making it easy to treat the oil.
[0035]
(3) Since the check valve is a gravity type by its own weight, its structure is simple and installation is easy.
[0036]
(4) By making the strainer cylindrical and providing a weir, foreign matter can be caught to prevent outflow to the underground tank side.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a pump device for a weighing machine according to the present invention.
FIG. 2 is a side sectional view showing an embodiment of the present invention.
3 is a cross-sectional view taken along the line XX in FIG. 2;
FIG. 4 is a side sectional view showing a strainer.
FIG. 5 is a schematic diagram showing the flow of a pump device for a weighing machine embodying the present invention.
[Explanation of symbols]
I ... Inflow path O ... Outflow path C ... Main body casing C1 ... Strainer casing 1 ... Strainer chamber 1a ... Seat 2 ... Strainer 2a ... End plate 2b ... Opening 2c ... Weir 3 ... Lid 5 ... Check valve 6 ... Pump 7 ... Inlet side chamber 8 ... Outlet side chamber 9 ... Gas-liquid separator 14 ... Strainer 17 ... chamber 18 ... control valve 19 ... bypass valve 20 ... passage 21 ... float chamber 22 ... float valve 23 ... outlet channel 24 ... opening 25 ... ·lid

Claims (1)

  In the inflow path structure of the pump device in which the pump (6) is housed in the box-shaped main body casing (C) and the strainer (2) is provided in the inflow path (I) to the pump (6), the main body casing ( C) is provided with a strainer casing (C1). The strainer casing (C1) has the inflow passage (I) formed vertically from the lower side, and is horizontally communicated with the inflow passage (I). (1) is formed and communicated from the strainer chamber (1) through the check valve (5) to the chamber (7) on the inlet side of the pump, and the strainer chamber (1) has a strainer ( A seat (1a) with which the end of 2) is engaged is formed, the other end is opened, and a strainer (2) is inserted through the opening (1b) to close the opening (1a). ) The strainer (2) is cylindrical and the lid side is closed by the end plate (2a), the other end pressed against the seat (1a) is opened (2b), and the opening (2b) side is entirely open. A weir (2c) is provided over the circumference, and the check valve (5) is a gravitational type and is configured to be movable in and out of the vertical direction, and is open to the strainer casing (C1) for attaching the check valve (5) ( 24) An inflow path structure of a pump device, wherein 24) is provided and is always closed by a lid (25).

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