JP4843959B2 - Self-priming pump - Google Patents

Description

  The present invention relates to a self-priming pump that is driven by a motor, sucks and discharges liquid, and has a self-priming function.

  The self-priming pump is widely used for circulation of a bath. However, in recent years, the demand for self-priming pumps has become widespread, and in addition to the pressure generated by the pump itself, an abnormal pushing pressure is applied to the pump by a water hammer or the like, and there are cases where normal operation is performed in a high pressure state. Therefore, the market demand is strongly required to have specifications that allow normal operation with high indentation pressure and high pressure in the pump.

  The self-priming pump satisfies the circulation function by providing a pressure difference, but a sheet-like elastic body is frequently used in order to maintain the sealing performance.

  In order to improve the sealing property between the pump chamber and the atmosphere and prevent the sheet-like elastic body from being displaced, a rib is provided on the sheet-like elastic body, and the rib is sandwiched between the casing and the casing cover of the self-priming pump, or the casing and the casing. A protrusion was attached to the cover, and a sheet-like elastic body was sandwiched between the protrusions to improve the retention.

  As shown in the cross-sectional view of the conventional self-priming pump in FIG. 4, the conventional self-priming pump has a motor cover 2 made of a rust-proof iron plate attached to the motor 1. A bracket 3 made of a rust-proof iron plate is attached, and a casing 4 made of a resin molded product and having an open end opposite to the bracket 3 is attached to the bracket 3 in order to reduce corrosion resistance, rust resistance, and weight. ing.

  The motor cover 2 and the bracket 3 are fixed by fixing screws 5.

  A shaft 6 connected to the motor 1 and made by cutting a steel round material is inserted into the casing 4, and a screw is formed at the tip of the shaft 6.

  Further, a rubber elastic drainer 7 is mounted on the shaft 6 in the vicinity of the casing 4 so that water leaking from the casing 4 does not enter the motor 1 through the shaft 6.

  Further, the casing 4 forms a pump chamber 11 and a water supply chamber 12 that house a sealed impeller 10 having an even number of blades 8 and a front shroud 9. The impeller 10 is made of a thermoplastic resin molded article having good compatibility with welding in order to reduce corrosion resistance, rust resistance, and weight.

  Then, a threaded product of a brass round bar cutting material or a brass knurled material is inserted, and this threaded product is screwed to a screw of the shaft 6 to couple the impeller 10 to the shaft 6.

  Further, a rotating side mechanical seal 13 made of carbon, a spring, and rubber packing is provided on the outer peripheral portion of the rotating portion having a cylindrical shape of the impeller 10, and this rotating side mechanical seal 13 is connected to the pump chamber 11 of the casing 4. This is slid on a fixed-side mechanical seal 14 made of ceramic and rubber packing mounted on the penetrating portion of the shaft 6 to prevent water leakage.

  The opening side of the casing cover 17 is joined to the opening side of the casing 4 with a partition plate 15 having a water passage at a predetermined position and a sheet-like elastic body 16 interposed therebetween. At this time, the sheet-like elastic body 16 is sandwiched between the casing 4 and the casing cover 17 and crushed to seal between the inside of the pump and the atmosphere, and the crushing margin of the sheet-like elastic body 16 is always constant. 4 and the casing cover 17 are in contact with each other on the outer peripheral surface.

  In order to reduce the corrosion resistance, rust resistance, and weight, the partition plate 15 is formed of a pressed product or a resin molded product of a SUS plate, the casing cover 17 includes a priming water tank 18 inside, a suction port 19, a discharge port. It has an outlet 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 poured into the casing cover 17 in advance. The water injected into the casing cover 17 fills the priming tank 18 and the pump chamber 11 and the water supply chamber 12 in the casing 4.

  First, at the time of start-up, the rotation of the motor 1 is transmitted to the impeller 10 by the shaft 6, and the impeller 10 accommodated in the pump chamber 11 in the casing 4 rotates. Then, the water in the pump chamber 11 is stirred by the impeller 10 and air is mixed into the water.

  The mixed water of water and air is pushed out from the pump chamber 11 and the water feeding chamber 12 along the outer periphery of the impeller 10, flows into the priming tank 18 of the casing cover 17, and only the air pushed out together with the water is discharged from the outlet. It flows out from 20 to the outside.

  When this state continues, the air pressure in the pump chamber 11 in the casing 4 gradually decreases, and when water flows in from the suction port 19 of the casing cover 17 due to a pressure difference with the outside, a full-scale water delivery state is entered. The priming water tank 18 of the casing cover 17 is filled with water, and the overflowing water flows out from the discharge port 20 to the outside.

  At this time, the rotation of the impeller 10 gives centrifugal force to the water, and the front shroud 9 acts to increase the pressure of the water flow introduced into the impeller 10. Further, the pump chamber 11 and the water supply chamber 12 perform the action of discharging the water flow flowing out from the impeller 10 to the priming tank 18 of the casing cover 17.

In the casing cover 17, water is introduced from the suction port 19 to the pump chamber 11 of the casing 4, discharged from the water supply chamber 12 of the casing 4 to the priming tank 18 of the casing cover 17, and discharged from the discharge port 20 to the outside. Perform the action. Further, the partition plate 15 having a water flow opening performs a pressure increasing action of the water flow of the impeller 10.
JP-A-5-44682

  In recent years, the demand for self-priming pumps has become versatile, and high-pressure pumps have been demanded. In addition, with the spread of single-hand ball valves and the like, an abnormal pushing pressure is often applied to the pump by a water hammer or the like in which the pressure in the water absorption pipe rapidly increases.

  4 is a cross-sectional view of a conventional self-priming pump, FIG. 5 is a plan view of a casing of the conventional self-priming pump, and FIG. 6 is an enlarged cross-sectional view of the casing and sheet-like elastic body of the conventional self-priming pump. .

  In the conventional structure, in order to make the crushing margin of the sheet-like elastic body constant, a wall is installed on the outer periphery of the casing and is in contact with the casing cover, so there is a place that is a wall on the side of the sheet-like elastic body However, there is a place where the sheet-like elastic body is simply sandwiched between the casing and the casing cover because it is not originally intended to prevent the protrusion. At that location, the sheet-like elastic body is deformed, and the sealing performance between the casing and the casing cover may be deteriorated.

  The present invention solves such a conventional problem, and the sheet-like elastic body is not deformed even when the pressure in the casing cover rises, and the sealing performance between the casing and the casing cover is always maintained. An object of the present invention is to provide a self-priming pump that can perform the above operation.

In order to achieve the above object, the present invention is connected to a casing incorporating an impeller for sucking and discharging liquid, a suction joint for introducing liquid into the impeller, and a discharge joint for discharging liquid discharged from the impeller to the outside. A sheet-like elastic body that is disposed between the casing and the casing cover to prevent water leakage, and a wall that contacts the outer peripheral surface of the casing cover is provided at the outer peripheral end of the casing. In the self-priming pump, the wall has a portion where an end face of the outer peripheral portion of the sheet-like elastic body does not contact , and is inside the wall and does not contact the sheet-like elastic body of the casing or the casing cover , and the seat on the outer peripheral side from the end surface of the outer peripheral portion of the Jo elastic body, varying of the sheet-like elastic body due to the pressure rise in the casing cover It is characterized in that a protrusion for preventing.

  With this configuration, it is possible to achieve the effect of preventing the deformation of the sheet-like elastic body when the pressure in the casing cover increases.

  The present invention has an effect that it is possible to provide a highly convenient self-priming pump that can always maintain the sealing performance between the casing and the casing cover.

  An embodiment of the present invention is a casing cover in which a casing incorporating an impeller for sucking and discharging liquid, a suction joint for introducing liquid into the impeller, and a discharge joint for discharging liquid discharged from the impeller to the outside are connected. A sheet-like elastic body disposed between the casing and the casing cover to prevent water leakage, and at least at a predetermined place on the joining surface of either the casing or the casing cover to increase the pressure in the casing cover. Protrusions having a predetermined height and width that prevent deformation of the accompanying sheet-like elastic body are provided.

  Thereby, the highly convenient self-priming pump which can always maintain the sealing performance between the casing and the casing cover can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1
In FIG. 1, a motor cover 2 made of a rust-proof iron plate is attached to the motor 1, and a bracket 3 made of a rust-proof iron plate is attached to the motor cover 2. A casing 4 made of a resin molded product and having an open end opposite to the bracket 3 is attached to reduce rust and weight.

  The motor cover 2 and the bracket 3 are fixed by fixing screws 5.

  A shaft 6 connected to the motor 1 and made by cutting a steel round material is inserted into the casing 4, and a screw is formed at the tip of the shaft 6.

  Further, a rubber elastic drainer 7 is mounted on the shaft 6 in the vicinity of the casing 4 so that water leaking from the casing 4 does not enter the motor 1 through the shaft 6.

  Further, the casing 4 forms a pump chamber 11 and a water supply chamber 12 that house a sealed impeller 10 having an even number of blades 8 and a front shroud 9. The impeller 10 is made of a thermoplastic resin molded article having good compatibility with welding in order to reduce corrosion resistance, rust resistance, and weight.

  Then, a threaded product of a brass round bar cutting material or a brass knurled material is inserted, and this threaded product is screwed to a screw of the shaft 6 to couple the impeller 10 to the shaft 6.

  Further, a rotating side mechanical seal 13 made of carbon, a spring, and rubber packing is provided on the outer peripheral portion of the rotating portion having a cylindrical shape of the impeller 10, and this rotating side mechanical seal 13 is connected to the pump chamber 11 of the casing 4. This is slid on a fixed-side mechanical seal 14 made of ceramic and rubber packing mounted on the penetrating portion of the shaft 6 to prevent water leakage.

  The opening side of the casing cover 17 is joined to the opening side of the casing 4 with a partition plate 15 having a water passage at a predetermined position and a sheet-like elastic body 16 interposed therebetween. At this time, the sheet-like elastic body 16 is sandwiched between the casing 4 and the casing cover 17 and crushed to seal between the inside of the pump and the atmosphere.

  Further, the casing 4 and the casing cover 17 are in contact with each other on the outer peripheral surface so that the crushing margin of the sheet-like elastic body 16 is always constant. The partition plate 15 is formed of a SUS plate press product or a resin molded product in order to reduce corrosion resistance, rust resistance, and weight, and the casing cover 17 includes a priming water tank 18 inside, and 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.

  In the above configuration, the operation of the pump in the first embodiment and the bathtub water circulation device including the pump will be described with reference to FIGS. 1 to 3.

  First, priming water is poured into the casing cover 17 in advance. The water injected into the casing cover 17 fills the priming tank 18 and the pump chamber 11 and the water supply chamber 12 in the casing 4.

  First, at the time of start-up, the rotation of the motor 1 is transmitted to the impeller 10 by the shaft 6, and the impeller 10 accommodated in the pump chamber 11 in the casing 4 rotates. Then, the water in the pump chamber 11 is stirred by the impeller 10 and air is mixed into the water.

  The mixed water of water and air is pushed out from the pump chamber 11 and the water feeding chamber 12 along the outer periphery of the impeller 10, flows into the priming tank 18 of the casing cover 17, and only the air pushed out together with the water is discharged from the outlet. It flows out from 20 to the outside.

  When this state continues, the air pressure in the pump chamber 11 in the casing 4 gradually decreases, and when water flows in from the suction port 19 of the casing cover 17 due to a pressure difference with the outside, a full-scale water delivery state is entered. The priming water tank 18 of the casing cover 17 is filled with water, and the overflowing water flows out from the discharge port 20 to the outside.

  At this time, the rotation of the impeller 10 gives centrifugal force to the water, and the front shroud 9 acts to increase the pressure of the water flow introduced into the impeller 10. Further, the pump chamber 11 and the water supply chamber 12 perform the action of discharging the water flow flowing out from the impeller 10 to the priming tank 18 of the casing cover 17.

  In the casing cover 17, water is introduced from the suction port 19 to the pump chamber 11 of the casing 4, discharged from the water supply chamber 12 of the casing 4 to the priming tank 18 of the casing cover 17, and discharged from the discharge port 20 to the outside. Perform the action. Further, the partition plate 15 having a water flow opening performs a pressure increasing action of the water flow of the impeller 10.

  At this time, in order to provide the protrusion 4a at the outer peripheral portion of the sheet-like elastic body 16 of the casing 4 where the end surface is not in contact with the casing 4, an abnormal pushing pressure such as a water hammer is generated, Even when the pressure rises and the sheet-like elastic body 16 is pushed outward, the protrusion 4a is prevented from protruding to the outside, and a high sealing performance can be maintained at all times.

  The self-priming pump of the present invention can be expected to be applied to various self-priming pumps used in, for example, fuel cell devices and heat pump devices.

Cross-sectional view of self-priming pump in an embodiment of the present invention Casing plan view of the embodiment of the present invention The cross-sectional enlarged view of the casing and sheet-like elastic body in the embodiment of the present invention Cross-sectional view of a conventional self-priming pump Casing plan view of conventional self-priming pump Cross-sectional enlarged view of a conventional self-priming pump casing and sheet-like elastic body

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Motor cover 3 Bracket 4 Casing 4a Protrusion 5 Fixing screw 6 Shaft 7 Draining 8 Blade 9 Front shroud 10 Impeller 11 Pump chamber 12 Water supply chamber 13 Rotation side mechanical seal 14 Fixed side mechanical seal 15 Partition plate 16 Sheet-like elasticity Body 17 Casing cover 18 Nozzle tank 19 Suction port 20 Discharge port

Claims (1)

A casing having a built-in impeller for sucking and discharging liquid; a casing joint to which a suction joint for introducing liquid into the impeller and a discharge joint for discharging liquid discharged from the impeller to the outside are connected; and the casing; A self-priming pump provided with a sheet-like elastic body disposed between casing covers to prevent water leakage and having a wall in contact with an outer peripheral surface of the casing cover at an outer peripheral end of the casing. The end surface of the outer peripheral portion of the sheet-like elastic body has a portion where the end surface does not contact , and is on the inner side of the wall that does not contact the sheet-like elastic body of the casing or the casing cover and on the outer peripheral side from the end surface of the outer peripheral portion of the sheet-like elastic body And a protrusion for preventing deformation of the sheet-like elastic body due to an increase in pressure in the casing cover. Self-priming pump.

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