JP2004011474A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device with pump legs prevented from being removed from a pump casing even when installed in a handling liquid for a long time. <P>SOLUTION: The pump device has the rubber pump legs 15 mounted on the pump casing 4 formed of a resin containing PPS, PP, or PA. The pump legs 15 are secured to leg portions 4b formed on the lower face of the pump casing 4 using highly corrosion resistant fasteners 16 of stainless steels or the like. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pump device, and more particularly to a pump device provided with a resin pump casing and the like and supported by rubber pump legs.
[0002]
[Prior art]
2. Description of the Related Art As a pump device used for water intake or drainage of a handled liquid, a pump device using a resin for components such as a pump casing is known. By using resin for the constituent members, corrosion of the members due to the handling liquid is prevented, and the weight of the pump device is reduced. A rubber pump leg is attached to such a pump device in order to protect a resin component from an installation floor on which the pump device is installed.
[0003]
Such a conventional pump device is shown in FIG. FIG. 3 is a sectional view showing a lower portion of a conventional pump device installed in water.
In FIG. 3, the impeller 1, the upper pump casing 3, the lower pump casing 4, the mechanical seal cover 11 for holding the mechanical seal 12, and the like are formed of resin. The pump device is disposed in the liquid to be used when used, and the impeller 1 is rotationally driven by a motor (not shown) via the main shaft 2, so that the liquid to be handled is drawn from a suction port 4 a formed in the lower pump casing 4. And discharges the handling liquid to the discharge side through the discharge channel 6.
[0004]
This pump device includes a rubber pump leg 15 as a cushioning material for protecting the resin lower pump casing 4 from an installation floor (not shown). The pump legs 15 are attached to each of a plurality of legs 4b formed on the lower surface of the lower pump casing 4, and are fixed to the lower pump casing 4 with an adhesive. That is, as shown in FIG. 3, a mounting hole 4c for mounting the pump leg 15 is formed in the leg 4b, and after applying an adhesive to the pump leg 15, the pump leg 15 is connected to the mounting hole. 4c is attached to the lower pump casing 4.
[0005]
[Problems to be solved by the invention]
However, in a pump device which is installed in the handling liquid, since the pump legs are immersed in the handling solution for a long time, the adhesive bonding the pump legs is peeled off, and the pump legs are removed from the lower pump casing. Sometimes came off. Further, in general, there is a problem that the adhesiveness between the resin and the rubber is poor, and the pump legs come off during transportation of the pump device. Further, the operation of applying the adhesive to the pump legs is generally troublesome, and the time required for drying the adhesive is required.
[0006]
The present invention has been made in view of the above circumstances, and has as its object to provide a pump device in which a pump leg is prevented from coming off a pump casing.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, the present invention according to claim 1, in a pump device in which a rubber pump leg is attached to a resin pump casing, the pump leg is fastened to the pump casing. It is characterized by being attached by a tool. This makes it possible to firmly attach the pump legs, thereby preventing the pump legs from being detached from the pump casing when the pump legs are immersed in the handling liquid for a long time or when the pump device is transported. It becomes possible. In addition, a work step of applying the adhesive to the pump leg can be omitted, and a time for drying the adhesive is omitted, so that workability can be improved and work time can be shortened.
[0008]
The invention according to claim 2 is characterized in that the fastener is formed of stainless steel. As a result, even if the pump legs are immersed in the handling liquid for a long period of time, the fasteners can be prevented from rusting, and as a result, the pump legs can be more securely fixed to the pump casing. It becomes.
[0009]
According to a third aspect of the present invention, the pump casing is made of a resin containing PPS, PP, or PA.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing a lower portion of the pump device according to the present embodiment.
[0011]
As shown in FIG. 1, the pump device according to the present embodiment includes an impeller 1, a main shaft 2 to which the impeller 1 is fixed, an upper pump casing 3 and a lower pump casing 4 in which the impeller 1 is housed. It has. In the present embodiment, the impeller 1, the upper pump casing 3, and the lower pump casing 4 are all formed of resin to prevent corrosion due to the handling liquid and to reduce the weight of the pump device. In addition, as a resin to be used, a resin containing polyphenylene sulfide (PPS), polypropylene (PP), polyamide (PA), or the like is preferable.
[0012]
The impeller 1 is fixed to a lower end of the main shaft 2 and is rotatably supported via the main shaft 2 by a bearing (not shown). The main shaft 2 is connected to a motor (not shown), and the impeller 1 is driven to rotate via the main shaft 2 by the motor. A mechanical seal 12 is disposed above the impeller 1 via a mechanical seal cover 11 made of resin. By arranging the mechanical seal 12, it is possible to prevent the handled liquid sucked by the impeller 1 from leaking to the motor side along the main shaft 2.
[0013]
The upper pump casing 3 is attached to a lower end of the mechanical seal cover 11, and a lower pump casing 4 is attached to a lower end of the upper pump casing 3. A casing chamber 5 is formed by the mechanical seal cover 11, the upper pump casing 3, and the lower pump casing 4, and the impeller 1 is housed in the casing chamber 5. A suction port 4 a for sucking the liquid to be handled is formed on the lower surface of the lower pump casing 4, and a discharge channel 6 is formed on a part of the side surface of the casing chamber 5. Further, a resin-made companion flange 7 is attached to the discharge-side opening of the discharge flow path 6 formed in the upper pump casing 3, and a discharge pipe (not shown) is connected to the companion flange 7. In the present embodiment, the pump casing divided into the upper pump casing 3 and the lower pump casing 4 is used. However, a pump casing in which these are integrally formed may be used. A pump casing in which the upper casing 3 is integrally formed may be used.
[0014]
The pump device according to the present embodiment configured as described above is disposed in the handling liquid when used. When the impeller 1 is driven to rotate by the motor, the handled liquid is sucked from the suction port 4a, and the sucked handled liquid is pressurized in the casing chamber 5 and then passes through the discharge flow path 6 to discharge pipe. Is discharged.
[0015]
Further, as shown in FIG. 1, the pump device according to the present embodiment includes a pump leg 15 that supports the pump device. The pump leg 15 is attached to the lower pump casing 4 by a tapping screw 16 that is a fastener. Fixed. The pump leg 15 is formed of rubber, and functions as a cushioning material for protecting the lower pump casing 4 formed of resin from an installation floor (not shown).
The pump leg 15 will be described with reference to FIG. FIG. 2 is an assembly diagram of a pump leg included in the pump device according to the present embodiment.
[0016]
As shown in FIG. 2, through-holes 15a and 15b having different diameters are formed coaxially in the pump leg 15, and the through-hole 15a having a small diameter has a diameter such that the screw shaft portion 16a is fitted. The large through hole 15b is formed so that the screw head 16b fits. On the other hand, on the lower surface of the lower pump casing 4, four leg portions 4b (three positions are shown in FIG. 1) for attaching the pump legs 15 are formed, and the pump legs 15 are fitted into each of the leg portions 4b. A mounting hole 4c is formed. Further, inside the mounting hole 4c, a screw hole 4d into which the tapping screw 16 is screwed is formed.
[0017]
The pump leg 15 is attached by inserting the pump leg 15 into the mounting hole 4c, inserting the tapping screw 16 into the through holes 15a, 15b, and screwing the tapping screw 16 into the screw hole 4d. 15 is fixed to the lower pump casing 4. Here, the material used for the tapping screw 16 is preferably stainless steel having high corrosion resistance. In this embodiment, tapping screws are used as fasteners, but other fasteners such as bolts may be used.
[0018]
As described above, since the pump device according to the present embodiment is installed in the handling liquid, the pump leg 15 is immersed in the handling liquid for a long time. Even in such a use condition, the pump leg 15 is firmly fixed to the lower pump casing 4 by the tapping screw 16, so that the pump leg 15 does not easily come off. Further, if a tapping screw made of, for example, stainless steel is used, it is possible to prevent the tapping screw from being corroded by the handling liquid, thereby making it possible to further securely fix the pump leg 15.
[0019]
In addition, since an operation step of applying the adhesive to the pump leg 15 can be omitted, the operation labor can be reduced, and the time for drying the adhesive can be omitted, so that the operation time can be reduced.
[0020]
【The invention's effect】
As described above, according to the present invention, the attachment of the pump legs can be strengthened by attaching the rubber pump legs to the resin pump casing with the fasteners. As a result, it is possible to prevent the pump legs from being detached from the pump casing when immersed in the handling liquid for a long time or during transportation of the pump device. In addition, a work step of applying the adhesive to the pump leg can be omitted, and a time for drying the adhesive is omitted, so that workability can be improved and work time can be shortened.
[0021]
Further, if the fastener is formed of stainless steel, it is possible to prevent the fastener from being rusted even when the pump leg is immersed in the handling liquid for a long period of time. It is possible to further secure the fixation.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a lower part of a pump device according to an embodiment of the present invention.
FIG. 2 is an assembly view of a pump leg included in the pump device according to one embodiment of the present invention.
FIG. 3 is a sectional view showing a lower portion of a conventional pump device installed in water.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Impeller 2 Main shaft 3 Upper pump casing 4 Lower pump casing 5 Casing chamber 6 Discharge channel 7 Companion flange 11 Mechanical seal cover 12 Mechanical seal 15 Pump leg 16 Tapping screw (fastener)

Claims (3)

In a pump device in which a rubber pump leg is attached to a resin pump casing,
A pump device wherein the pump leg is attached to the pump casing by a fastener. The pump device according to claim 1, wherein the fastener is formed of stainless steel. The pump device according to claim 1, wherein the pump casing is made of a resin containing PPS, PP, or PA.

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