JP2002130175A - Self-priming pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the cause of applying stress by water pressure to a casing cover for forming a priming tank, leaking water by the occurrence of a crack at the root of an triangular rib at the root of a machine screw fastening part in the middle of the priming tank of the casing cover, and finally reducing durability as a self-priming pump when supply water pressure to the pump is high and when the water pressure is repeatedly applied in the self-priming pump. SOLUTION: A priming tank waterway part of the casing cover 14 of the self-priming pump is constituted by forming a projection 21 in a part reaching an inner wall for forming a suction channel 15 from an outer wall, and even at repetitive operation time of the pump, and even when the stress by the supply water pressure and the pepetitive water pressure is applied, rigidity of the casing cover 14 increases by the projection 21, and the stress can be relieved so that the self-priming pump having large durability on the supply water pressure and the repetitive water pressure can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, an impeller fixed to a rotating shaft of the motor, a casing for accommodating the impeller, a partition plate and a packing having a water passage, and a priming tank. The present invention relates to a self-priming pump that is provided with a casing cover and that is used by being incorporated in a hot water supply / heating device or the like.

[0002]

2. Description of the Related Art Generally, a self-priming pump has a casing for accommodating an impeller and a casing cover for priming for filling the impeller accommodating portion of the casing with water.

[0003] In particular, as a pump of a type in which a casing and a casing cover are integrated, there is a pump configured as shown in FIG.

FIG. 12 is a sectional view of a conventional self-priming pump.
FIG. 13 is a plan view of a casing cover in the self-priming pump, and FIG. 14 is a cross-sectional view taken along the line AA of the casing cover.

As shown in FIGS. 12 to 14, a motor 2 is provided with a bracket 2 made of a rust-prevented iron plate. The bracket 2 is made of a resin molded product in order to reduce corrosion resistance, rust resistance and weight. In addition, a casing 3 having an open end opposite to the motor 1 is attached.

A shaft 4 connected to the motor 1 and made by cutting a steel round material is inserted into the casing 3, and a screw is formed at the tip of the shaft 4.
In addition, the casing 3 forms a pump chamber 8 and a water supply chamber 9 that house an even number of blades 5 and a closed impeller 7 having a front shroud 6. The impeller 7 is made of a thermoplastic resin molded article having good welding compatibility for corrosion resistance, rust resistance, and weight reduction. Then, a threaded product of a brass round bar cutting material or a brass knurl material is inserted, and the threaded product is screwed to a screw of the shaft 4 to couple the impeller 7 to the shaft 4. Further, a rotating mechanical seal 10 made of carbon, a spring, and rubber packing is provided on an outer peripheral portion of the cylindrical rotating portion of the impeller 7.
The rotating side mechanical seal 10 is slid on a fixed side mechanical seal 11 made of ceramic and rubber packing attached to a portion of the casing 3 through the shaft 4 of the pump chamber 8 of the casing 3 to prevent water leakage. I have to.

On the opening side of the casing 3, the opening side of the casing cover 14 is connected via a partition plate 12 having a water inlet at a predetermined position and a packing 13. The partition plate 12 is formed of a pressed or resin-formed SUS plate in order to reduce corrosion resistance, rust resistance, and weight, and the casing cover 14 has an inner wall 16 that forms a suction channel 15 therein,
It has a priming tank 17, and has an arbitrary number of triangular ribs 18 at the base of the screw fastening portion in the middle of the priming tank 17. Further, it has a suction port 19 and a discharge port 20, and is made of a resin molded product in order to reduce corrosion resistance, rust resistance and weight.

Next, the operation of the self-priming pump configured as described above will be described.

First, priming water is injected into the casing cover 14 in advance. The water injected into the casing cover 14 fills the suction channel 15, the priming tank 17, and the pump chamber 8 and the water supply chamber 9 in the casing 3. First, at the time of starting, the rotation of the motor 1 is transmitted to the impeller 7 by the shaft 4, and the impeller 7 housed in the pump chamber 8 in the casing 3 rotates. Then, the water in the pump chamber 8 is stirred by the impeller 7, and air is mixed into the water. The mixed water of air and air flows along the outer circumference of the impeller 7 into the pump chamber 8,
Only the air that is pushed out of the water supply chamber 9 and flows into the priming tank 17 of the casing cover 14 and is pushed out together with the water flows out of the discharge port 20 to the outside. When this state continues, the air pressure in the pump chamber 8 in the casing 3 gradually decreases, and water flows in from the suction port 19 of the casing cover 14 due to a pressure difference with the outside. The suction channel 15 of the casing cover 14 and the priming tank 17 are filled with water, and the overflowing water is discharged from the discharge port 2.
It flows out from 0.

At this time, the rotation of the impeller 7 gives a centrifugal force to the water, and the front shroud 6 acts to increase the pressure of the water flow guided into the impeller 7. Further, the pump chamber 8 and the water supply chamber 9 apply the water flow flowing out of the impeller 7 to the casing cover 1.
The operation of discharging to No. 4 priming tank 17 is performed. Also,
In the casing cover 14, water is introduced from the suction port 19 to the pump chamber 8 of the casing 3, discharged from the water supply chamber 9 of the casing 3 to the priming tank 17 of the casing cover 14, and discharged from the discharge port 20 to the outside. Do. Further, the partition plate 12 having the water inlet performs a pressure increasing action of the water flow of the impeller 7.

[0011]

However, in the self-priming pump having the above-described structure, when the water supply pressure to the pump is high or when the water pressure is repeatedly applied, the casing of the impeller accommodating portion, the priming tank, etc. The casing cover that forms the pipe is subjected to stress due to water pressure, and eventually the root of the triangular rib at the root of the screw tightening part in the middle of the priming tank of the casing cover cracks and water leakage occurs, and the self-priming pump As a cause of lowering the durability.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a self-priming pump having excellent durability with respect to water pressure to a casing cover and repetitive water pressure.

[0013]

In order to solve the above-mentioned problems, a self-priming pump according to the present invention is configured such that a convex thick part is formed in a part of a water passage part of a priming tank of the casing cover. Specifically, a priming tank and a suction channel are formed from the outer wall of the triangular rib with an arbitrary width up and down around the center of the triangular rib at the root of the screw fastening portion in the middle of the casing cover priming tank. A bulge is formed toward the inner wall to increase the rigidity of a part of the priming tank.

According to the present invention, the swelling of the priming tank of the casing cover increases the rigidity due to the bulging even when the pump is repeatedly operated, even when the water supply pressure and the repeated water pressure are applied. It is possible to provide a self-priming pump that can relieve stress and has excellent durability with respect to water supply pressure and repeated water pressure.

[0015]

The invention according to claim 1 of the present invention includes a motor, an impeller fixed to a rotating shaft of the motor, and a casing for accommodating the impeller and forming a pump chamber, A self-priming pump comprising a casing cover connected to a casing through a partition plate having a water inlet and packing, and forming a priming tank therein, and a part of a water passage portion of the priming tank of the casing cover. Is a self-priming pump with a convex thick wall
Specifically, centering on the center of the triangular rib at the root of the screw fastening part in the middle of the priming tank of the casing cover,
With an arbitrary width up and down, a protrusion is formed from the outer wall of the triangular rib to the inner wall that forms the priming tank and suction channel, so even during repeated operation of the pump, even if stress due to water supply pressure, repeated water pressure is applied, Since the rigidity is increased by the protrusion, the stress on the casing cover can be reduced, and the effect of improving the durability with respect to the water supply pressure and the repeated water pressure can be obtained.

According to a second aspect of the present invention, there is provided a motor, an impeller fixed to a rotating shaft of the motor, a casing for accommodating the impeller and forming a pump chamber, and having a water inlet. A self-priming pump comprising a casing cover connected to a casing via a partition plate and packing, and forming a priming tank therein, wherein the casing cover has a water passage portion of a screw fastening portion in the middle of the priming tank. , A self-priming pump with a semicircular wall parallel to the outer wall and having a water outlet and an inlet on the discharge side and the anti-discharge side. Even if a stress is applied, the rigidity is increased by the semicircular wall, so that the same effect as in claim 1 is obtained.

According to a third aspect of the present invention, there is provided a self-priming pump according to the first aspect, wherein a discharge is formed in a water passage portion of a screw fastening portion of the casing cover in the middle of a priming tank, in parallel with an outer wall, and discharges. Water outlet on the discharge side and the counter discharge side,
A semi-circular wall with an inflow port is formed.Even during repeated operation of the pump, even if stress is applied due to feed water pressure and repeated water pressure, rigidity increases due to protrusion, and The rigidity is further improved by the wall, and the effect of improving the durability with respect to the water supply pressure and the repetitive water pressure is obtained as compared with the first and second aspects.

According to a fourth aspect of the present invention, there is provided a motor, an impeller fixed to a rotating shaft of the motor, a casing for accommodating the impeller and forming a pump chamber, and having a water inlet. A self-priming pump comprising a casing cover connected to a casing via a partition plate and a packing and forming a priming tank therein, wherein a suction channel is provided from an upper outer wall to a channel portion of the priming tank of the casing cover. A self-priming pump in which a vertical wall having an outlet for water and an inlet for water is formed on the discharge side and the anti-discharge side in contact with the inner wall forming the pump.
Even if stress is applied by the water supply pressure and the repeated water pressure, the rigidity is increased by the vertical wall in contact with the inner wall forming the suction channel from the upper outer wall.

According to a fifth aspect of the present invention, in the self-priming pump according to the first aspect, the casing cover is in contact with a water passage portion of a priming tank from an upper outer wall to an inner wall forming a suction water passage from an upper outer wall, A vertical wall with an outlet and an inlet for water is formed on the discharge side and the counter discharge side.Even when the pump is repeatedly operated, even if stress is applied by water supply pressure and repeated water pressure, rigidity due to protrusion is raised. Further, the rigidity is further increased by the vertical wall which is in contact with the inner wall forming the suction water channel, and the effect of improving the water supply pressure and the repetition water pressure is further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of a self-priming pump according to Embodiment 1 of the present invention, FIG. 2 is a plan view of a casing cover of the self-priming pump, and FIG. It is BB sectional drawing. The same components as those of the conventional self-priming pump described above are denoted by the same reference numerals, and the description of the configuration and operation is omitted.

The feature of the self-priming pump of the first embodiment resides in the casing cover, that is, as shown in FIGS. 2 to 3, the priming tank 17 of the casing cover 14.
With the center of the triangular rib 18 at the root of the screw fastening part in the middle, the protruding portion from the outer wall of the triangular rib 18 toward the priming tank 17 and the inner wall 16 forming the suction channel 15 with an arbitrary width up and down. 21 are formed.

As described above, the protrusion 21 of the priming tank 17 of the casing cover 14 of the self-priming pump according to the first embodiment allows the pump to be operated even when the pump is repeatedly operated, even when the supply water pressure and the stress due to the repeated water pressure are applied. Since the stiffness is increased by the protrusion 21, generation of stress on the casing cover 14 can be suppressed.

(Embodiment 2) FIG. 4 is a plan view of a casing cover in a self-priming pump according to Embodiment 2 of the present invention, and FIG. 5 is a sectional view of the casing cover taken along line CC.

The feature of the second embodiment is that the casing cover 14 is provided with a water outlet 22 which is parallel to the outer wall in the middle of the priming tank 17 at the screw tightening portion and is on the discharge side and the opposite discharge side. Semi-circular wall 24 with inlet 23
Is formed.

With the configuration of the self-priming pump, the rigidity is increased by the semicircular wall 24 even when the pump is repeatedly operated, and the stress due to the water supply pressure and the repeated water pressure is applied. Can be suppressed.

(Embodiment 3) FIG. 6 is a plan view of a casing cover in a self-priming pump according to Embodiment 3 of the present invention, and FIG. 7 is a sectional view of the casing cover taken along the line DD.
The same components as those in the first and second embodiments described above are denoted by the same reference numerals, and description of the configuration will be omitted.

The feature of the third embodiment lies in a configuration in which the contents of the second embodiment are added to the first embodiment.

According to the structure of the self-priming pump, even when the pump is repeatedly operated, the rigidity is increased by the protrusions 21 even when stress is applied by the feed water pressure and the repeated water pressure.
Further, the rigidity is further improved by the semicircular wall 24, and the generation of stress on the casing cover 14 can be further suppressed as compared with the first and second embodiments.

(Embodiment 4) FIG. 8 is a plan view of a casing cover in a self-priming pump according to Embodiment 4 of the present invention, and FIG. 9 is a sectional view of the casing cover taken along line E-E.

The feature of the third embodiment is that the casing cover 14 is in contact with a water passage portion of a priming tank 17 from an upper outer wall to an inner wall 16 forming a suction water passage 15, and a water flow is provided on a discharge side and a counter discharge side. A vertical wall 27 having an outlet 25 and an inlet 26 is formed.

With the structure of the self-priming pump, the rigidity is maintained by the vertical wall 27 that contacts the inner wall 16 that forms the suction channel 15 from the upper outer wall even when the pump is repeatedly operated and subjected to stress due to the water supply pressure and the repeated water pressure. As a result, the occurrence of stress on the casing cover 14 can be suppressed.

(Fifth Embodiment) FIG. 10 is a plan view of a casing cover in a self-priming pump according to a fifth embodiment of the present invention, and FIG. 11 is a sectional view of the casing cover taken along line FF. The same components as those in the first and fourth embodiments described above are denoted by the same reference numerals, and description of the configuration will be omitted.

The feature of the fifth embodiment resides in a configuration in which the contents of the fourth embodiment are added to the first embodiment.

With the structure of the self-priming pump, even when the pump is repeatedly operated, the rigidity is increased by the projections 21 even when stress is applied by the feed water pressure and the repeated water pressure.
Further, the vertical wall 27 in contact with the inner wall 16 forming the suction channel 15 further increases rigidity, and can further suppress generation of stress on the casing cover 14 as compared with the first and fourth embodiments.

[0036]

As is apparent from the above description, the self-priming pump of the present invention has a protrusion at the priming tank channel portion of the casing cover, a suction from the semicircular wall parallel to the outer wall and the upper outer wall. Because the vertical wall is formed to be in contact with the inner wall that forms the water channel, even during repeated operation of the pump, even when water supply pressure and stress due to repeated water pressure are applied,
The convexity, the semicircular wall parallel to the outer wall, and the vertical wall in contact with the inner wall forming the suction channel from the upper outer wall increase rigidity, so that the generation of stress on the casing cover can be suppressed, so that the casing cover The present invention can provide a self-priming pump having excellent durability with respect to the water supply pressure and the repetitive water pressure by relieving stress on the water supply pressure, and has a large practical effect.

[Brief description of the drawings]

FIG. 1 is a sectional view of a self-priming pump according to a first embodiment of the present invention.

FIG. 2 is a plan view of a casing cover in the self-priming pump.

FIG. 3 is a sectional view of the casing cover taken along line BB.

FIG. 4 is a plan view of a casing cover in the self-priming pump according to Embodiment 2 of the present invention.

FIG. 5 is a sectional view of the casing cover taken along line CC.

FIG. 6 is a plan view of a casing cover in the self-priming pump according to Embodiment 3 of the present invention.

FIG. 7 is a sectional view of the casing cover taken along line DD.

FIG. 8 is a plan view of a casing cover in a self-priming pump according to a fourth embodiment of the present invention.

FIG. 9 is an EE cross-sectional view of the casing cover.

FIG. 10 is a plan view of a casing cover in a self-priming pump according to a fifth embodiment of the present invention.

FIG. 11 is a sectional view taken along line FF of the casing cover.

FIG. 12 is a sectional view of a conventional self-priming pump.

FIG. 13 is a plan view of a casing cover in the self-priming pump.

FIG. 14 is a sectional view of the casing cover taken along line AA.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Bracket 3 Casing 4 Shaft 5 Blade 6 Front shroud 7 Impeller 8 Pump room 9 Water supply room 10 Rotary side mechanical seal 11 Fixed side mechanical seal 12 Partition plate 13 Packing 14 Casing cover 15 Suction water passage 16 Inner wall 18 Primer tank Triangular rib 19 Suction port 20 Discharge port 21 Convex 22 Outflow port 23 Inflow port 24 Semi-circular wall 25 Outflow port 26 Inflow port 27 Vertical wall

Claims (5)

[Claims] 1. A casing comprising a motor, an impeller fixed to a rotating shaft of the motor, and a casing for accommodating the impeller and forming a pump chamber, wherein the casing is provided via a partition plate having a water passage and packing. And a self-priming pump comprising a casing cover forming a priming tank therein, wherein a convex thick part is formed in a part of a water passage part of the priming tank of the casing cover. A self-priming pump. 2. A casing comprising a motor, an impeller fixed to a rotating shaft of the motor, and a casing for accommodating the impeller and forming a pump chamber, wherein the casing is provided via a partition plate having a water inlet and packing. Self-priming pump comprising a casing cover forming a priming tank therein, wherein the pump is parallel to the outer wall at a water passage portion of a screw fastening portion in the middle of the priming tank of the casing cover. A self-priming pump characterized in that a semicircular wall having an outlet and an inlet for water is formed on an outlet side and an opposite discharge side. 3. A semicircular wall parallel to the outer wall and having a water outlet and a water inlet on a discharge side and a counter discharge side is provided in a water passage portion of a screw tightening portion of the casing cover in the middle of the priming tank. The self-priming pump according to claim 1, wherein the pump is formed. 4. A casing comprising a motor, an impeller fixed to a rotating shaft of the motor, and a casing for accommodating the impeller and forming a pump chamber, wherein the casing is provided via a partition plate having a water inlet and packing. And a self-priming pump comprising a casing cover forming a priming tank therein, wherein the casing cover is in contact with a water passage portion of the priming tank, which is in contact with an inner wall forming a suction water passage from an upper outer wall, A self-priming pump characterized in that a vertical wall having an outlet and an inlet for water is formed on a discharge side and a counter discharge side. 5. A vertical wall having a water outlet and a water inlet on a discharge side and a counter discharge side is formed on a water passage portion of a priming tank of a casing cover in contact with an inner wall forming a suction water passage from an upper outer wall. The self-priming pump according to claim 1, wherein: