JP2012145009A - Drainage pump for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve sufficient antimicrobial effect for drain water (dew condensation water) of an air conditioner, and to reduce a footprint in the air conditioner.SOLUTION: A motor part 10 is supported by an outer wall 63 and a longitudinal wall 62 constituting a labyrinth structure in a lid case 6 of a pump part 20. A cylindrical antimicrobial unit 8 to be fitted in a drain part 61 is provided inside the longitudinal wall 62. The antimicrobial unit 8 has a structure in which an antimicrobial agent 82 is stored in a net-like case 81 having an opening 81a. Return water flowing from the drain part 61 flows inside the antimicrobial unit 8. The antimicrobial agent 82 is a block-like one in which silver (Ag) ions are carried in water-soluble glass, for example. By the labyrinth structure, water paddling noise leaking to the outside is reduced.

Description

  The present invention relates to a drainage pump for an air conditioner for draining drain water (condensation water) accumulated in a drain pan of an air conditioner.

  Conventionally, in an air conditioner, an antibacterial agent is used in order to prevent slime from being generated in a drain pan or a drain pump. For example, Japanese Patent Application Laid-Open No. 10-299693 (Patent Document 1) discloses a technique for forming a rotary blade of a drainage pump, a pump housing, and a cover with a resin kneaded with a powdery antibacterial agent. Japanese Patent Laying-Open No. 2006-194491 (Patent Document 2) discloses a technique for disposing an antibacterial agent unit having an antibacterial agent in the vicinity of a suction port of a drain pump. Furthermore, International Publication No. 2004/053398 pamphlet (Patent Document 3) includes a drain pump (drainage pump) impeller, an antibacterial metal material, a resin material having an antibacterial property, and an antibacterial agent added thereto. A technique is disclosed which is made of a material.

JP-A-10-299693 JP 2006-194491 A International Publication No. 2004/053398 Pamphlet

  In Patent Document 1 and Patent Document 3, an antibacterial effect is obtained by forming a member in contact with drain water, such as an impeller (impeller) of a drainage pump or a cover, with a resin kneaded with an antibacterial agent. . However, a member made of a resin kneaded with an antibacterial agent generally has an insufficient antibacterial effect because the amount of the antibacterial agent is generally small. When an antibacterial metal material is used, after a certain amount of time, the metal surface forms a corrosion product and becomes stable, so that the antibacterial effect diminishes and the antibacterial metal ions do not elute into water. There's a problem. Moreover, since the thing in patent document 2 permeates into the accommodation location of the antibacterial agent in the antibacterial agent unit in the drain pan, a high effect is obtained for the water in the part where the antibacterial agent is immersed. However, since the antibacterial agent unit is installed in the drain pan slightly away from the drainage pump, it is difficult to receive the flow of drain water, and the antibacterial effect cannot be obtained for the entire drain water of the air conditioner. There is room for. In addition, when an antibacterial agent is disposed in the drain pan, there is a problem in terms of occupied space.

  The present invention achieves a sufficient antibacterial effect on the drain water of an air conditioner and reduces the occupied space in the air conditioner.

  The drainage pump for an air conditioner according to claim 1 is a drainage pump for an air conditioner that rotates an impeller of a pump unit by a motor unit, sucks water from a suction port at the pump unit, and discharges water from a discharge port. The pump section includes a pump chamber case that houses the impeller coupled to a drive shaft of the motor section, and a cylindrical wall section that is disposed on the motor section side of the pump chamber case and supports the motor section. A lid case in which the drive shaft is penetrated and a draining portion having an opening in the wall portion is formed, inside the wall portion, in a space around the draining portion, in the mesh case An antibacterial unit containing an antibacterial agent is arranged.

  The air conditioner drain pump according to claim 2 is the air conditioner drain pump according to claim 1, wherein the wall portion of the lid case has a cylindrical shape and an outer periphery thereof is parallel to the axis of the drive shaft. A vertical wall having a plurality of protrusions formed on the outer wall and an outer wall outside the vertical wall, the motor wall being supported by the end surface of the vertical wall and the outer wall on the motor unit side, and the vertical wall and the outer wall. Constitutes a labyrinth structure.

  The drainage pump for an air conditioner according to claim 3 is the drainage pump for an air conditioner according to claim 1, wherein a plurality of ridges are formed on the outer periphery of the antibacterial agent unit in parallel with the axis of the drive shaft. The wall portion of the lid case is a cylindrical outer wall, and the motor portion is supported by an end surface of the outer wall on the motor portion side, and the outer periphery of the antibacterial agent unit and the outer wall constitute a labyrinth structure. It is characterized by that.

  The air conditioner drain pump according to claim 4 is the air conditioner drain pump according to any one of claims 1 to 3, wherein the motor unit is formed by integrally molding a stator unit in a resin mold unit. It is a DC brushless motor having a stator circuit portion.

  According to the air conditioner drainage pump of the first aspect, the motor part is supported by the wall part of the lid case on the pump part side, and the antibacterial agent unit is disposed in the space around the draining part inside the wall part. As a result, the return water that flows into the pump chamber case from the discharge port flows out from the draining portion to the inside of the wall, and at this time, the return water comes into contact with the antibacterial agent in the antibacterial agent unit, and this water further flows into the lid Since the water flows out from the outer periphery of the pump or from the pump chamber case and the suction port to the drain pan, the water accumulated in the drain pan frequently and evenly contacts the antibacterial agent, and a sufficient antibacterial effect is obtained against the drain water. In addition, since the antibacterial agent unit is arranged in the lid case, the occupied space can be reduced.

  According to the air conditioner drainage pump of claim 2, in addition to the effect of claim 1, the labyrinth structure of the wall part supporting the motor part can prevent the pumping sound of the pump from leaking to the outside.

  According to the drain pump for an air conditioner of claim 3, in addition to the effect of claim 1, the outer wall supporting the motor part is used as a wall part, and the pump is formed by a labyrinth structure composed of the wall part and the antibacterial agent unit. Can be prevented from leaking to the outside, and the antibacterial agent unit also serves as a labyrinth structure, so that the structure can be simplified.

  According to the drain pump for an air conditioner of claim 4, in addition to the effect of any one of claims 1 to 3, the motor part is a DC having a stator circuit part in which a stator unit and a resin mold part are integrally molded. Since it is a brushless motor, water resistance and corrosion resistance by the resin mold part are enhanced.

It is a partially broken side view of the air conditioner drain pump of the embodiment of the present invention. It is a perspective view of the antibacterial agent unit and lid case in the drainage pump for air conditioners of an embodiment. It is a perspective view which shows the other example of the antibacterial agent unit of the drainage pump for air conditioners of embodiment.

  Next, an embodiment of a drainage pump for an air conditioner of the present invention will be described with reference to the drawings. FIG. 1 is a partially broken side view of an air conditioner drain pump according to an embodiment, and FIG. 2 is a perspective view of an antibacterial agent unit and a lid case in the air conditioner drain pump. 1 corresponds to the AA cross section of FIG. In the following description, the air conditioner drain pump is also simply referred to as “drain pump”. The drainage pump includes a motor unit 10, a pump unit 20, and a fixed unit (bracket) 30.

  The motor unit 10 includes bearing assemblies 1 and 2, a stator circuit unit 3, and a rotor 4. A through hole 3a is formed in the center of the motor unit 10, bearing assemblies 1 and 2 are disposed in the opening of the through hole 3a, and the rotor 4 is disposed in the through hole 3a. The shaft 41 is axially supported by the bearing assemblies 1 and 2. The stator circuit portion 3 is configured by embedding a stator unit 32, a circuit board 33, and the like in a resin mold portion 31 by integral molding.

  The resin mold part 31 is made of BMC (Bulk molding compound) resin. This BMC resin is a molding material in which unsaturated polyester is mixed with glass fiber filler and calcium carbonate (filler) to form a bulk. Then, after the stator unit 32 and the circuit board 33 are set in a mold, the BMC resin is filled in the mold and subjected to pressurization and heat treatment to be integrally formed. The stator unit 31 and the rotor 4 constitute a three-phase DC brushless motor.

  The pump section 20 includes a resin-made thin cylindrical pump chamber case 5 and a resin-made cylindrical lid case 6. The pump chamber case 5 is formed with a suction port 51 disposed in a drain pan (not shown) of the air conditioner and a discharge port 52 to which a discharge pipe (not shown) is connected. In addition, a fitting portion (not shown) is formed at two locations on the outer periphery of the pump chamber case 5, and the pump chamber case 5 and the lid case 6 are attached and fixed by snap-fitting this fitting portion to the lower end portion of the lid case 6. Has been.

  An impeller 7 is disposed in the pump chamber case 5. The impeller 7 has a shaft fitting portion 71 and has four plate-like small blades 72 extending along the direction of the central axis L below the shaft fitting portion 71. Is disposed in the suction port 51. The shaft fitting portion 71 is fixed to the drive shaft 41 of the motor unit 10. Further, a donut-shaped hollow conical plate 73 formed in a substantially inverted conical shape is provided between the shaft fitting portion 71 and the small blades 72, and the impeller 7 is rotated by the motor portion 10, and the suction port When the small blades 72 are rotated in 51, the water of the drain pan rises into the suction port 51, and the water moves to the hollow conical plate 73 side by centrifugal force. Then, the water in the pump chamber case 5 is rotated by the hollow conical plate 73 and the large blades 74 provided on the hollow conical plate 73, and the water is discharged from the discharge port 52 by the centrifugal force.

  In the center of the lid case 6, a draining portion 61 is formed around the drive shaft 41 and the central axis L of the pump portion 20. The draining portion 61 is formed with a through hole 61a in the center, and has openings 61b communicating with the inside of the pump chamber case 5 at several locations on the outer periphery. And the drive shaft 41 has penetrated the through-hole 61a of this draining part 61. FIG. A cylindrical vertical wall 62 extending toward the motor unit 10 is formed outside the draining unit 61. As shown in FIG. 2, the vertical wall 62 has slits 62a formed at positions spaced apart from each other by 180 °, and a plurality of vertical ridges 62b formed on the outer periphery. Furthermore, a cylindrical outer wall 63 extending toward the motor unit 10 is formed on the outer periphery of the vertical wall 62. Mounting bosses 63 a are formed at two locations on the outer periphery of the outer wall 63. In addition, slits 63b are formed in the outer wall 63 at positions separated from the slits 62a of the vertical wall 62 by 90 ° and at positions separated from each other by 180 °.

  The end surfaces of the vertical wall 62 and the outer wall 63 on the motor unit 10 side are located within the plane of the stator circuit unit 3, and the entire circumference of the end surface of the vertical wall 62 is in contact with the resin mold unit 31 of the stator circuit unit 3. The vertical wall 62 supports the motor unit 10. The vertical wall 62 and the outer wall 63 constitute a “wall portion”. Then, the fixing portion (bracket) 30 is fitted to the motor portion 10, the mounting boss portion 30 a of the fixing portion (bracket) 30 and the mounting boss portion 63 a of the lid case 6 are abutted, and the fixing portion is fixed by the tapping screw N. A (bracket) 30 is screwed to the lid case 6.

  Inside the vertical wall 62, an antibacterial agent unit 8 in which a block-shaped antibacterial agent 82 is accommodated in a cylindrical net-like case 81 made of resin is disposed. The antibacterial agent unit 8 has a through hole 8a at the center, and a draining portion 61 is loosely fitted into the through hole 8a and the drive shaft 41 of the motor unit 10 is passed through. In addition, a large number of apertures 81a are formed on the outer periphery and inner periphery of the cylindrical shape of the mesh case 81, and the size of the openings 81a is sufficiently smaller than the size of the block of the antibacterial agent 82. It has become. Thereby, the antibacterial agent 82 does not spill out of the mesh-like case 81. In addition, the antibacterial agent 82 of this Example carries silver (Ag) ions on water-soluble glass.

  With the above configuration, when the drainage pump is stopped, drain water in a discharge pipe (not shown) connected to the discharge port 52 returns from the discharge port 52 into the pump chamber case 5. This return water not only flows from the suction port 51 in the pop chamber case 5 toward the drain pan, but also overflows vigorously from the opening 61 b of the draining portion 61 toward the antibacterial agent unit 8 in the vertical wall 62. The return water overflowing from the opening 61b of the draining portion 61 enters the antibacterial agent unit 8 from the opening 81a of the mesh case 81, and the antibacterial agent 82 is immersed in the flow of the return water. At this time, the silver (Ag) ion of the antibacterial agent 82 is gradually released into the return water and exhibits an antibacterial effect. The return water flows through the gap between the vertical wall 62 and the outer wall 63 and flows out to the external drain pan. In this way, since the antibacterial agent unit 8 (antibacterial agent 82) is arranged immediately near the return water overflowing from the opening 61b of the drainer 61, the return water is evenly exposed to the antibacterial agent 82, and Since the water splashes vigorously, the antibacterial effect is not deteriorated because it is possible to clean the scales and dust. Accordingly, a sufficient antibacterial effect is finally obtained against the drain water in the drain pan.

  The vertical wall 62 and the outer wall 63 form a gap between them. In addition, the two slits 62 a of the vertical wall 62 and the two slits 63 b of the outer wall 63 are formed at positions spaced 90 ° from each other around the axis L. And the passage leading from the through hole 8a of the antibacterial agent unit 8 to the inside of the vertical wall 62, the slit 62a, the gap between the vertical wall 62 and the outer wall 63, and the outside through the slit 63b has a labyrinth structure. Therefore, it is possible to reduce leakage of scuffing sound mainly generated in the suction port 51 from the slit 63b. Further, since the vertical wall 62 is formed with a plurality of convex ridges 62b on the gap side between the vertical wall 62 and the outer wall 63, sound irregular reflection and absorption are performed by the convex ridges 62b. Can be prevented from leaking outside.

  FIG. 3 shows another embodiment of the antimicrobial unit. This antibacterial agent unit 9 is made of resin and contains a block-shaped antibacterial agent 92 in a cylindrical mesh-like case 91 as in the case of the antibacterial agent unit 8, and has a through hole 9a in the center. The draining part 61 is loosely fitted in the through hole 9a, and the drive shaft 41 of the motor part 10 is passed. A plurality of vertical ridges 9 b are formed on the outer peripheral surface of the mesh case 91. Furthermore, a large number of openings 91a are formed on the outer periphery and inner periphery (surface on the through hole 9a side) other than the ridges 9b, and the size of the openings 91a is larger than the size of the block of the antibacterial agent 92. It has a sufficiently small shape. Thereby, the antibacterial agent 92 does not spill out of the mesh case 91. In addition, the antibacterial agent 92 of this Example also carries | supports silver (Ag) ion on water-soluble glass. The action of the opening 91a and the antibacterial agent 92 is the same as that of the antibacterial agent unit 8.

  The antibacterial agent unit 9 is disposed in the lid case 6 having a structure in which the vertical wall 62 is eliminated. The lid case 6 has the same structure as that described above except that the vertical wall 62 is not provided. In this case, the outer wall 63 constitutes a “wall portion”. A plurality of vertical ridges 9 b are formed on the outer peripheral surface of the antibacterial agent unit 9. And the passage which leads from the through-hole 9a of the antibacterial agent unit 9 to the space | gap between the antibacterial agent unit 9 and the outer wall 63, and the slit 63b becomes a labyrinth structure. The antibacterial agent unit 9 is formed with a plurality of ridges 62b. Therefore, similarly to the above, it is possible to reduce leakage of scuffing sound mainly generated in the suction port 51 from the slit 63b.

  The antibacterial agents 82 and 92 of the embodiment are those in which silver (Ag) ions are supported on water-soluble glass, but this is an example, and any antibacterial agent may be used as long as it has an antibacterial action against bacteria in water. For example, metal ions such as copper (Cu), zinc (Zn), and tin (Sn) supported on water-soluble glass may be used. Further, the carrier is not limited to water-soluble glass but may be other members. Furthermore, other organic antibacterial agents as disclosed in Patent Document 1 may be used.

  The motor unit may be a type in which a stator unit, a circuit board, a magnetic switch (sensor), a rotor, and the like are accommodated in a motor case.

DESCRIPTION OF SYMBOLS 3 Stator circuit part 31 Resin mold part 32 Stator unit 33 Circuit board 4 Rotor 41 Drive shaft 5 Pump chamber case 6 Cover case 61 Drain part 62 Vertical wall (wall part)
62a Slit 63 Outer wall (wall)
63b Slit 7 Impeller 71 Shaft fitting portion 8, 9 Antibacterial agent unit 81, 91 Mesh case 82, 92 Antibacterial agent 10 Motor portion 20 Pump portion 30 Fixing portion (bracket)
L axis

Claims (4)

In the air conditioner drainage pump that rotates the impeller of the pump unit by the motor unit, sucks water from the suction port at the pump unit and discharges water from the discharge port,
The pump section includes a pump chamber case that houses the impeller coupled to a drive shaft of the motor section, and a cylindrical wall section that is disposed on the motor section side of the pump chamber case and supports the motor section. A lid case in which the drive shaft is penetrated and a draining portion having an opening in the wall portion is formed,
An air conditioner drainage pump characterized in that an antibacterial unit containing an antibacterial agent in a mesh-like case is disposed in a space around the draining portion inside the wall portion.   The wall portion of the lid case is formed of a cylindrical wall having a plurality of ridges formed on the outer periphery thereof in parallel with the axis of the drive shaft, and an outer wall outside the vertical wall, and the vertical wall The exhaust pump for an air conditioner according to claim 1, wherein the motor unit is supported by an end surface of the outer wall on the motor unit side, and the vertical wall and the outer wall form a labyrinth structure.   A plurality of ridges are formed on the outer periphery of the antibacterial agent unit in parallel with the axis of the drive shaft, the wall portion of the lid case is a cylindrical outer wall, and the end surface of the outer wall on the motor portion side The drainage pump for an air conditioner according to claim 1, wherein the motor unit is supported and an outer periphery of the antibacterial agent unit and the outer wall form a labyrinth structure.   The drainage pump for an air conditioner according to any one of claims 1 to 3, wherein the motor unit is a DC brushless motor having a stator circuit unit in which a stator unit is integrally formed in a resin mold unit.

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