JP5629865B2 - pump - Google Patents

Description

  The present invention relates to a pump, and more particularly to a pump that has improved water pressure resistance by increasing the strength of the outside and inside of the pump made of a synthetic resin casing.

  Pumps incorporated in equipment such as a hot water supply device are required to be small, light, and save energy in response to requests for downsizing, lightening, and saving energy.

  As such a pump, a rotor is sealed inside a casing, a stator for driving the rotor is provided outside the casing to constitute a DC brushless motor, and an impeller is provided in a pump chamber connected to the rotor. An arranged pump is provided (for example, Patent Document 1).

  FIG. 7 is a longitudinal half sectional view showing an example of a conventional pump. As shown in the figure, the pump 100 has a rotor 121 disposed in a space between upper and lower casings 111 and 112 made of synthetic resin, and a ring-shaped stator 122 is disposed along the outer periphery of the rotor 121. This is a canned pump that constitutes the motor of the pump 100.

  The upper and lower casings 111 and 112 sandwich the packing 115 and seal the inside of the pump 100, and a pump chamber 116 is provided in the upper space, and a water suction port 133, a discharge port 117 and a drain plug for fluid that communicates with the pump chamber 116. A portion 114 protrudes from the casing 111 and is provided integrally with the casing 111.

  The rotor 121 is rotatably supported by a fixed shaft 123 fixed to the center of the pump 100 inside the casing, with a thrust washer 124 disposed further vertically via a rotation shaft 125.

  In this rotor 121, an impeller base 126 is connected to a rotating shaft 125, and an impeller 127 is connected to an upper portion thereof, and a magnet 128 is fixed around the rotor. The magnet 128 is disposed in the cup-shaped space portion of the casing 112.

  The stator 122 includes a ring-shaped laminated iron core 129 and a winding 130, and is molded into a mold resin 132 together with the printed circuit board 131 to form an annular resin molded body 133.

  The resin molded body 133 is disposed outside the casing 112 and on the outer periphery of the magnet 128 of the rotor 121 and fixed to the casing 112 to form a brushless DC motor. The stator 122 is energized from the printed circuit board 131. Then, the rotor 121 rotates and the impeller 127 rotates, and the fluid is sucked into the pump chamber 116 from the water suction port 113, and the fluid pressurized by the impeller 127 is discharged from the discharge port 117. .

JP 2001-317486 A

  In the pump 100 as described above, in order to improve the water pressure resistance of the pump 100 by suppressing the displacement of the resin casings 111 and 112 due to water pressure, a metal casing having higher strength than the resin casings 111 and 112 is used. It is done to use.

  However, in the case of a metal casing, it is difficult to form a metal plate into a three-dimensional casing shape by pressing or welding, and there is a problem that the processing cost is high, and measures against weight increase of the pump and corrosion resistance Is also required.

  In the pump 100, as shown in FIG. 7, the annular resin molded body 133 receives the pressure inside the pump through the casing at the contact portion 136 with the casing 112, and when the pump internal pressure increases, The resin molded body 133 may be damaged, such as cracks, in the contact portion 136 with the thin resin layer therebetween, and the resin molded body 133 may eventually fall off the casing 112.

  Further, in the pump 100, a slight gap S is formed between the inner peripheral part of the resin molded body 133 fixed to the casing 112 and the outer peripheral part of the casing 112, and the casing 112 is equivalent to the gap S every time the casing 112 receives the pump internal pressure. Will continue to expand. By repeating this expansion, there is a problem that cracks are easily generated in the weld line of the casing having a low strength, which causes water leakage of the pump 100.

Accordingly, the present invention has been made in view of the above-mentioned problems, and it is possible to increase the pump cost and weight by increasing the strength of the pump using a resin casing to improve the water pressure resistance and the durability. The purpose is to provide without accompanying.

In the present invention, a rotor including a magnet is disposed inside a synthetic resin casing provided with a water suction port and a discharge port of a pump, and a stator is molded in a mold resin to form an annular resin molded body. And the resin molded body is arranged outside the casing and arranged on the outer periphery of the rotor to constitute a motor of the pump, and an impeller connected to the rotor is provided in the casing. In the pump disposed in the pump chamber, a metal cover that covers the casing is fixed to the outer surface of the casing, and the metal cover is disposed so as to surround the periphery of the water inlet. The outer end is located radially outside the pump chamber , and the metal cover is fixed to the casing on the radially outer side of the pump chamber .

  With the pump of the present invention, the resin casing is reinforced with a metal plate, so that the casing strength is as good as that of metal while being made of resin, and the water pressure resistance is improved by suppressing distortion and displacement due to the internal pressure of the pump. The durability of the pump can be improved. Further, since the metal plate can be easily manufactured by press working or the like, it can be manufactured at low cost by attaching the metal plate to the resin casing, and the weight of the pump can be minimized.

  Hereinafter, an embodiment of a pump according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a longitudinal half sectional view showing a pump 10 of the first embodiment, and FIG. 2 is a plan view thereof. As shown in the figure, the pump 10 has a rotor 21 disposed in a casing between upper and lower casings 11 and 12 made of synthetic resin, and a ring-shaped stator 22 is disposed along the outer periphery of the rotor 21. This is a canned pump that constitutes the motor of the pump 10.

  The upper and lower casings 11, 12 sandwich the packing 15 to seal the inside of the pump 10, and a pump chamber 1 6 is provided in the upper space in the casing. A fluid inlet 13 and a discharge port 17 for communicating the pump chamber 1 6 are provided. And the drain plug part 14 protrudes from the casing 11 and is integrally formed with the casing 11.

  The rotor 21 is rotatably mounted on a fixed shaft 23 fixed between the upper and lower casings 11 and 12 at the center of the pump 10 inside the casing via a rotating shaft 25 and a thrust washer 24 disposed above and below the rotating shaft 25. It is supported.

  The rotor 21 has an impeller base 26 connected to a rotary shaft 25 made of a slidable resin such as polyphenylene sulfide, an impeller 27 connected to an upper portion of the base 26, and the impeller 27 around the rotor. The magnet 28 to be arranged is fixed. The magnet 28 is disposed in the cup-shaped space at the center of the casing 12.

  The stator 22 includes a ring-shaped laminated iron core 29 and a winding 30 and is molded into a mold resin 32 together with a printed circuit board 31 having a control circuit to form an annular resin molded body 33.

  The resin molded body 33 is disposed outside the casing 12 along the outer peripheral portion of the magnet 28 of the rotor 21 and is fixed to the outer peripheral portion of the casing 12 to form the motor of the pump 10.

  This motor constitutes a brushless DC motor. When the stator 22 is energized from the printed circuit board 31, a rotating magnetic field is generated in the stator 22 and the rotor 21 rotates. When the rotor 21 rotates, the impeller 27 connected to the rotor 21 also rotates. The fluid is sucked into the pump chamber 16 from the water suction port 13, and the fluid pressurized by the impeller 27 is discharged from the discharge port 17. .

  In the pump 10 of this embodiment, a metal bracket 1 made of a metal cover of an annular plate is arranged outside the casing 11 so as to cover the outer surface of the casing 11, and is screwed to the casing 11 with four screws 2. The pump 10 is integrally fixed.

  The metal bracket 1 has through holes 3 and 4 through which the water inlet 13 protruding from the casing 11 and the drain plug 14 are inserted, and is easily manufactured by pressing a stainless steel plate or an aluminum alloy plate. Also, it can be easily attached to the pump 1 0.

  The metal bracket 1 can reinforce and enhance the pump 10 composed of the resin casings 11 and 12 to the same pump strength as that of the metal casing, minimizes the weight increase of the pump 10, and manufactures and attaches the metal bracket. Therefore, an increase in cost can be suppressed.

  In the illustrated example, the metal bracket 1 is provided so as to cover only one side of the pump 10, that is, the outer surface side of the upper casing 11, but metal brackets are arranged on both sides of the pump 10. It may be reinforced so as to sandwich the pump 10. Moreover, the planar shape of the metal bracket can be used in accordance with the form of the pump, such as a substantially square shape or a rectangular shape other than the circular shape shown in the figure.

  The pump 10 reinforced by the metal bracket 1 can greatly improve the water pressure resistance against repeated internal pressure application of the pump, extend the life of the pump, and increase the maximum internal pressure to reduce the size of the pump.

[Second Embodiment]
FIG. 3 is a half sectional view showing the pump 50 of the second embodiment, and FIG. 4 is an enlarged view of a portion A in FIG. As shown in the figure, the pump 50 is a canned pump having the same main pump structure as the pump 10 shown in the first embodiment. In FIG. 3, the same members as those in FIG. 1 are denoted by the same reference numerals, and the description of the structure of the pump 50 is omitted.

  In the pump 50 according to the second embodiment, the stator 22 including the ring-shaped laminated iron core 29 and the winding 30 and the printed board 31 are both molded in the mold resin 32 to form an annular resin molded body 34. doing.

  The resin molded body 34 has a reinforcing plate 5 made of an annular metal plate on a part of a contact portion with the casing 12, that is, a portion of the mold resin 32 a between the substrate 31 and the outside of the cup-shaped bottom portion 35 of the casing 12. Is buried.

  The reinforcing plate 5 is made of a stainless steel plate or an aluminum alloy plate. When the stator 22 and the printed circuit board 31 are molded to form a resin molded body 34, the reinforcing plate 5 can be simultaneously insert-molded and embedded in the resin 32.

  The reinforcing plate 5 can reinforce a portion 32a where the thickness of the mold resin 32 is thin and weak in strength between the cup-shaped bottom portion 35 of the casing 12 and the substrate 31, and the pump internal pressure transmitted repeatedly from the bottom portion 35 of the casing 12 Thus, the reinforcing plate 5 relaxes and the pressure and displacement transmitted to the resin molded body 34 can be reduced. Thereby, generation | occurrence | production of the crack of the resin molding 34, etc. can be prevented, the damage and destruction of the stator 22 can be prevented, and the drop-off | omission from the casing 12 of the resin molding 34 by the growth of a crack can be prevented.

  The reinforcing plate may be provided in a portion where the resin molded body 34 is easily affected by the internal pressure of the pump in the contact portion between the resin molded body 34 and the casing 12, for example, the upper surface portion 34 a of the resin molded body 34. Since the influence of the internal pressure of the pump is small on the contact surface with the casing 12, a reinforcing plate may not be provided.

  Moreover, in the pump 50, the reinforcing plate 18 made of an annular metal plate is insert-molded and embedded in the upper casing 11a so as to surround the periphery of the protruding portion of the water suction port 13, and the strength of the pump 50 is further increased. It has become.

[Third Embodiment]
FIG. 5 is a longitudinal half sectional view showing the pump 60 of the third embodiment, and FIG. 6 is an enlarged view of a portion B in FIG. As shown in the figure, the pump 60 is a canned pump having the same main pump structure as the pumps 10 and 50 shown in the first and second embodiments. In FIG. 5, the same members as those in FIG. 1 are denoted by the same reference numerals, and the description of the structure of the pump 60 is omitted.

  Similarly to the pump 10, the pump 60 according to the third embodiment includes a stator 22 including a ring-shaped laminated iron core 29 and a winding 30 and a printed circuit board 31 that are molded into a mold resin 32 and formed into an annular shape. A resin molded body 33 is formed.

  The resin molded body 33 is fixed along the outer peripheral portion of the casing 12 along the outer peripheral portion of the magnet 28 of the rotor 21. A slight gap S is generated between the inner peripheral surface of the resin molded body 33 and the outer peripheral surface of the casing 12 as shown in FIG.

  The pump 60 of the present embodiment fills the gap 6 between the resin molded body 33 and the casing 12 with the filler 6, and when the resin molded body 33 is assembled into the casing 12, The filler 6 can be easily filled in the gap S by applying the filler 6 to one or both of the outer peripheral surfaces of the casing 12.

  The filler 6 is not particularly limited, and fillers having various properties such as oil, rubber, and resin can be used. Among these, a rubber-based or resin-like silicon-based filler is preferable because it is excellent in the effect of suppressing the expansion of the casing 12, is easy to handle during application, is inexpensive, and is preferable.

  Thereby, it is possible to suppress the casing 12 from expanding due to the internal pressure of the pump, and to prevent the casing 12 from cracking from the weld line due to repeated expansion in the gap S.

  As described above, as the reinforcing means of the pump according to the present invention, (1) a metal cover is fixed to the outer surface of the resin casing, (2) at least a part of the contact portion between the resin molded body and the casing. In each embodiment, the metal plate is embedded in the resin molded body, and (3) the filler is filled between the inner peripheral surface of the resin molded body and the outer peripheral surface of the casing. Of course, two methods may be selected from the method (3) and performed simultaneously, or the three methods may be performed simultaneously.

  The present invention is not limited to the above embodiment, and can be changed without departing from the gist of the present invention. In addition, a self-priming pump, an axial flow pump, and a plurality of discharge ports are provided in various structures, and the impeller rotates. The present invention can also be applied to a so-called reversible pump that can select a discharge port according to a direction and send a fluid.

  The pump of the present invention can be used as a pump for various applications, and is particularly preferably used as a circulating pump for a hot water heater that can simultaneously supply hot water to a plurality of hot water destinations such as a heating device, a bath, and a kitchen.

It is a longitudinal half sectional view of the pump of a 1st embodiment. It is a top view of a pump same as the above. It is a longitudinal half sectional view of the pump of a 2nd embodiment. It is the A section enlarged view of FIG. It is a longitudinal half sectional view of the pump of a 3rd embodiment. It is the B section enlarged view of FIG. It is a longitudinal half sectional view of the pump of the conventional example.

DESCRIPTION OF SYMBOLS 1 ... Metal bracket 10 ... Pump 11 ... Casing 12 ... Casing 13 ... Water inlet 17 ... Discharge port 16 ... Pump chamber 21 ... Rotor 22 ... Stator 32 ... Mold resin 33 ... ... Resin molding

Claims (9)

A rotor including a magnet is disposed inside a synthetic resin casing provided with a water intake port and a discharge port of the pump.
The stator is molded in the mold resin to form an annular resin molded body,
The resin molded body is arranged outside the casing and on the outer periphery of the rotor to constitute a motor of the pump,
In the pump in which the impeller connected to the rotor is disposed in the pump chamber in the casing,
A metal cover that covers the casing is fixed to the outer surface of the casing,
The metal cover is disposed so as to surround the water inlet;
The outer end of the metal cover is located radially outside the pump chamber ,
The pump according to claim 1, wherein the metal cover is fixed to the casing on a radially outer side of the pump chamber . The pump according to claim 1,
The casing includes an upper casing and a lower casing divided in an axial direction,
Pump, wherein the resin molded body arranged on the outside of the lower portion of the casing, said metal cover is fixed to the outer surface of the upper casing. The pump according to claim 2, wherein
The said metal cover is provided in the position which pinched | interposed the said pump chamber with respect to the upper surface part of the said resin molding . The pump according to any one of claims 1 to 3,
The pump, wherein the metal cover is screwed to the casing with a plurality of screws. The pump according to claim 4, wherein
The casing has a drain plug portion,
The drain plug portion is located on the radially outer side of the pump chamber,
The pump according to claim 1, wherein the drain plug portion is located in the same radial direction as the circumferential region of the screw in a plan view. The pump according to claim 4, wherein
The casing has a drain plug portion,
The pump according to claim 1, wherein the drain plug portion is located between the screws in a plan view. The pump according to claim 2, wherein
The lower casing has a cup shape,
The pump, wherein the magnet is arranged in a cup-shaped space of the lower casing. A pump according to any of claims 1 to 4 or 7 ,
The casing has a drain plug portion,
The metal cover includes two through holes penetrating in the axial direction,
The pump, wherein the water suction port and the drain plug portion are inserted through the through holes. The pump according to any one of claims 1 to 8 ,
A pump in which a filler is filled in a gap between the inner peripheral surface of the resin molded body and the outer peripheral surface of the casing.

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