JPH11193978A - Equipment for handling low temperature water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an icemaker of a low cost with an excellent durability without complicated structure with excellent waterproofness and rust prevention without dew formation by eliminating a decrease in a low temperature water handling capacity due to a temperature rise in a sealed unit without developing a heat due to an operation. SOLUTION: In the equipment for handling a water by a DC pump driven by a DC power source without almost generating a heat, i.e. an icemaker used for a circulating pump, the DC pump is a brushless DC pump of the structure having an impeller 12 to directly drive the impeller having a magnet 20 integrally mounted via a stator 14. In this case, the stator 14 and a driving circuit 17 in a case 15 are potted 16 with a resin. A water immersion preventing means such as, for example, soldering is executed at an end or an intermediate part of a power cord 19 out of a pump case to prevent invasion of water into the pump body case due to a capillarity with the stator 14 integrally molded with the case 15 via an insulator in such a manner that the case 15 and a back casing 13 are formed of the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for handling low-temperature water by supplying water by a pump in an apparatus, and more particularly to an automatic ice maker having a structure for supplying water to an ice making section by a pump in an ice maker.

[0002]

2. Description of the Related Art Conventionally, in an ice maker which is a device for handling low-temperature water by supplying water by a pump in the device, a pump used in an automatic ice maker having a structure for spraying water to an ice maker is provided with an AC power supply. A magnetic coupling type pump or a mechanical seal type pump using a condenser run type or a shade type induction motor driven by a magnetic field has been used.

However, since these pumps are driven by an AC power supply, they generate considerable heat as the operation proceeds. The considerable heat generated during this continuous operation fills the inside of the machine near the closed state, raising the temperature inside the machine, and the generated heat is transmitted to the outer wall of the pump, etc., to the circulated water, raising the water temperature I was letting it.

Further, in the AC induction motor, the rotor generates heat as the operation proceeds, and in the case of a mechanical seal type pump, the shaft is directly connected to the pump chamber, and the heat is transmitted through the shaft to raise the water temperature. .

Further, as shown in the figure, a pump is often installed near an ice making section or an ice receiving section for simplification of piping and the like, and is operated in a high humidity environment. Also, in terms of function, the temperature of the circulating water is low, so condensation is inevitable.
For insulation, the stator winding required a special varnish treatment, and the metal portion required the use of a rust-resistant material such as stainless steel or a special coating.

Also, the bearing is made of stainless steel which is hardly rusted, or has a complicated structure, for example, a labyrinth mechanism is provided in the housing portion in order to prevent dew condensation water from entering.

[0007]

As described above, in the conventional ice making machine, the temperature inside the sealed machine is increased by the considerable heat gradually generated as the operation proceeds, and the temperature of the circulating water is increased. However, there is a problem that the ice making capacity is reduced by increasing the temperature.

Further, the atmosphere of the pump is at a high humidity,
Due to the low temperature of the circulating water due to its function, it is easy for dew condensation to occur.Therefore, a special varnish treatment is applied to the stator windings.
Or, use a special rust-preventive paint, use a rust-resistant material such as stainless steel for the bearing, or give a labyrinth structure to prevent dew condensation water from entering. Also had problems in durability and cost.

Further, measures to prevent rust by making the case resinous are also considered, but since the stator must be securely fixed, press fitting the stator into the resin case is difficult and difficult. Was.

[0010]

As a result of elucidating the above-mentioned problems, an ice making machine, which is a conventional device for handling low-temperature water, is replaced by a pump that generates a considerable amount of heat because it is driven by an AC power supply. In view of its use, the present invention provides a device for handling low-temperature water, characterized in that a DC pump driven by a DC power source and generating almost no heat is used for a circulation pump for supplying city water. It is an ice machine.
In the present invention, "almost no heat is generated" means that an ice induction machine, which is a conventional water handling device, employs an AC induction motor using an AC power source and has an energy efficiency of about 50%, whereas the DC efficiency of the present invention is about 50%. The energy efficiency of a DC pump using a power supply is as high as about 75%. Therefore, the heat generated by an induction motor using a conventional AC power supply is smaller than that of a conventional AC power supply by a difference of 25% of this energy efficiency. The degree to which you do not feel heat in your hands even when you touch the case. Therefore, even if the inside of the case of the DC pump is potted, there is no burning.

That is, according to the first aspect of the present invention, there is provided an apparatus for handling low-temperature water having a pump section for supplying water in a high-humidity atmosphere in an equipment room. And a pump for handling low-temperature water, wherein a pump driven by a DC power supply and hardly generating heat is provided in the pump section.

According to the second aspect of the present invention, the equipment for handling low-temperature water has a compressor, a condenser, a pump section, a water tank, and an ice making section, and supplies water from the internal water tank to the ice making section by the pump section. 2. An apparatus for handling low-temperature water according to claim 1, wherein the apparatus is an ice making machine for making ice.

According to a third aspect of the present invention, the DC pump is a brushless DC pump having a structure in which a magnet integrally mounted on the impeller is directly driven by a stator. It is equipment that handles low-temperature water in the means. According to a fourth aspect of the present invention, in the DC pump, the stator and the drive circuit in the case are potted with a resin, and the low-temperature water is handled by any one of the first to third aspects. Equipment.

According to the fifth aspect of the present invention, the DC pump is connected to a power supply cord in which a gap between electric wires in the power supply cord outside the case is drained by embedding processing, and is connected to a drive circuit section in the case due to a capillary phenomenon. The apparatus for handling low-temperature water according to any one of claims 1 to 4, wherein water intrusion is prevented.

According to a sixth aspect of the present invention, the DC pump is a device for handling low water temperature water according to any one of the first to fifth aspects, wherein the case is made of resin.

According to a seventh aspect of the present invention, the DC pump has a stator core in which the case and the insulator are integrally formed of resin. Equipment that handles

The operation of the above means will be sequentially described below. In the equipment for handling low-temperature water of the present invention, for example, an ice making machine, the city water circulation pump of the pump section is a DC pump driven by a DC power supply. This DC pump, unlike the AC pump, generates almost no heat even if it continues to operate, so the temperature inside the pump hardly rises and the city water passing through the pump is not heated, and
No heat is dissipated outside the pump. Therefore, the cooling efficiency of the ice-making room is excellent, and the ice-making capacity is enhanced, resulting in energy saving.

Further, since the direct current pump is a brushless direct current pump driven directly by a stator, there is no rotating body other than the pump portion, so that power transmission loss and wear of parts are small, and there is a fear that durability is reduced due to rust. Nor.

Furthermore, since the stator core and the drive circuit section in the case are potted by filling a resin, for example, urethane resin, from the insertion hole of the power cord after assembling the DC pump, these charging sections are used. The structure is isolated from the outside air, does not cause dew condensation, and does not allow the dew condensation water to directly touch the charging part. Therefore, the durability is improved.

The outer surface of the cord at the terminal or intermediate portion of the power supply cord of the drive power source outside the pump case is peeled to expose a large number of thin copper wires, and formed between the plurality of exposed wires. Since the capillary is soldered or coated with an adhesive with good permeability and embedded, the cord is covered again and drained, water can enter the charged part in the pump body case due to capillary action from the power cord. Has been prevented.

Further, by using a DC direct drive pump and using a resin case, the DC pump can be significantly reduced in size and weight.

Further, since the case and the insulator are integrally formed stator cores, the case can be easily made of resin, the step of inserting the stator can be omitted, and the generation of rust due to dew condensation water can be prevented. Absent.

[0023]

1 to 3 show an embodiment of the present invention. FIG. 1 is a schematic view showing the entire structure of the ice making machine according to the embodiment, FIG. 2 is a schematic sectional view of the structure of the DC pump of FIG. 1, and FIG. 3 is a schematic view showing a waterproof structure of the power cord.

As shown in FIG. 1, the structure of the ice making machine is as follows: a driving chamber B having a refrigerant compressor 5 and a driving section 11 thereof at a lower portion; a tank 1 for storing city water at an upper portion; And an ice making chamber A having a pump 2 for spraying city water from the fountain part 3 to the ice making part 4 and a drain receiver 7 and an ice receiving chamber 6 for receiving the iced ice, and a refrigerant pipe on the back of the ice making chamber. 9 comprises a condenser 10 and a drain 8,
The city water in the tank 1 is sent by the pump 2 to fountain the city water from the fountain unit 3 into the fountain into the ice making unit 4, the compressor is operated, and the ice making unit 4 is cooled with the cooled refrigerant to make ice. When completed, the ice making section 4 is slightly warmed to separate the ice from the ice making section 4 and store it in the ice receiving chamber 6.
By the way, usually, the pump 2 is integrated with the tank 1 and the fountain 3 for simplification of piping and the like.

As can be understood from FIG. 1, the interior of the ice making room A is sealed to increase the freezing capacity, and water is fountain inside the ice making room A, and ice is preserved.
The inside is in a humid state. In addition, the city water for ice making which is circulated is cooled by the ice making part 4 and becomes low temperature.
Since the water passes through the pump 2, the water passage section has a structure in which dew condensation easily occurs. In addition, although not shown, since there is an outlet for ice in the front of the ice making chamber A, when taking out the ice,
The outside air easily enters the ice making room A, and the inside of the ice making room A is in a more easily dew-condensed state.

Therefore, the pump 2 for supplying and circulating the city water from the tank 1 to the ejection section 3 is a direct-drive DC pump 2 shown in FIG. FIG. 2 schematically shows the structure of the DC pump 2.
DC pump 2 includes impeller 12, back casing 1
3, stator 14, case 15, potting 16, drive circuit 17, stator winding 18, power cord 19, magnet 20, water inlet 21, water outlet 22, power cord 19
Is formed.

As can be understood from FIG.
Does not have a rotor like a conventional AC type pump, the only rotating body in the DC pump 2 is an impeller that rotates by integrally mounting a magnet having an impeller 12.
Since there is no rotating body such as a rotor outside the pump part as in the conventional AC type pump, the durability of the pump can be improved even in the above-mentioned bad environment where dew condensation is likely to occur.

Since the DC pump 2 has a structure in which the back casing 13 which is a part of the partition of the water channel enters the stator 14 side, the cold water flows through the back casing 13 so that the outside of the back casing 13 is fixed. Child 14,
The case 15 is in a state where condensation easily occurs. Therefore, as shown in FIG. 2, the case 1 is made of a potting material such as urethane resin.
5, the stator 14 and the stator winding 18 in the case 15 and the drive circuit 17 are assembled through the insertion hole 27 of the power cord 19 into the case 15 after the DC pump is assembled.
For example, by filling a urethane resin or the like, it is embedded and integrated by the potting 16. Therefore, the inside of the case 15 is completely shut off from the outside air, and the case 1
5, the stator 14, the drive circuit 17, and the outer surface of the back casing 13 do not condense.

Further, since the DC pump 2 hardly generates heat, it is not necessary to make the case 15 a metal to improve heat radiation. Therefore, as shown in FIG.
The case 15 can be easily made of resin by forming the resin portion of the insulator 23 and the case 15 for insulating the same from the same resin and integrally molding them. When the back casing 13 and the case 15 are made of resin, even if the outer surfaces of the back casing 13 and the case 15 are condensed, there is no problem in durability.

Further, a portion of the power cord 19 directly connected to the drive circuit 17 in the case 15 and protruding from the case 15 is provided at the terminal or intermediate portion of the power cord 19 as shown in FIG. After the lead wire is stripped to form a peeled portion 24, the entire periphery of a large number of copper wires in this portion is soldered or an anaerobic adhesive having excellent permeability is applied to the soldered portion or the adhesive applied. The draining section 25 is formed. By the formation of the draining section 25, the capillaries formed between the many copper wires of the lead wires are filled with solder or an adhesive. After the draining process, the draining section 25 is covered with the heat-shrinkable tube 26 so as not to touch the bare lead wires. By this processing, water is prevented from penetrating through the power supply cord 19 into the charged portion of the drive circuit 17 due to a capillary phenomenon formed by a gap between a large number of thin copper wires of the power supply cord 19.

[0031]

As described above, in the equipment or ice making machine for handling low-temperature water according to the present invention, the circulating pump for sending water to the ice-making unit, that is, the location of the equipment for handling low-temperature water, is a direct-current DC pump. Since the pump is driven, the temperature inside the pump hardly rises, and the city water passing through the pump is not heated. Also, heat is not dissipated outside the pump. Therefore, the cooling efficiency of the ice making room is excellent and the ice making capacity is increased,
As a result, energy is saved.

Further, since the DC pump is a brushless DC pump directly driven by the stator, there is no rotating body other than the impeller of the pump portion, so that power transmission loss and component wear are reduced, and the durability of the component is reduced due to rust. Nor. Furthermore, the stator and the drive circuit in the case are made of resin,
For example, since these components are potted with a urethane resin or the like, these components are shielded from the outside air and do not condense, and the condensed water does not directly touch, so that the durability is excellent. In addition, since the end or the middle of the power cord extending outside the pump case is subjected to drainage treatment to prevent water intrusion, the water flowing into the charged part in the pump body case due to the capillary action between the many copper wires of the lead wires. No intrusion.

Further, since the case and the insulator are formed as an integrally formed stator core, the case can be easily made of resin, and the step of inserting the stator into the case or the back casing is eliminated. No rust caused by water. Since there is no rust due to condensation, there is no need for conventional maintenance, and durability is greatly improved. Furthermore, the use of a DC direct drive pump and the resinification of the case can significantly reduce the size and weight of the DC pump.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an entire structure of an ice making machine according to one embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a structure of a DC pump used in the ice making machine of the present invention.

FIG. 3 is a schematic diagram showing a waterproof structure of a power cord.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Pump 3 Fountain part 4 Ice making part 5 Compressor 6 Ice receiving room 7 Drain receiver 8 Drain 9 Refrigerant pipeline 10 Condenser 11 Drive unit 12 Impeller 13 Back casing 14 Stator 15 Case 16 Potting 17 Drive circuit 18 Stator winding 19 Power Cord 20 Magnet 21 Water Inlet 22 Water Outlet 23 Insulator 24 Peeling Part 25 Draining Part 26 Heat Shrink Tube 27 Insertion Hole A Ice Making Room B Drive Room

Claims (7)

[Claims] 1. An apparatus which has a pump section for supplying water in a high-humidity atmosphere in an equipment room and handles low-temperature water, a pump which hardly generates heat driven by a DC power supply in the pump section (hereinafter referred to as a pump). , "DC pump".) Equipment that handles low-temperature water. 2. An apparatus for handling low-temperature water includes a compressor, a condenser, a pump, a water tank, and an ice making unit. The ice making unit sends water from the water tank in the machine to the ice making unit by the pump unit. The equipment for handling low-temperature water according to claim 1, wherein the equipment is a water heater. 3. The low-temperature water according to claim 1, wherein the DC pump is a brushless DC pump having a structure in which a magnet integrally mounted on the impeller is directly driven by a stator. Equipment that handles 4. The apparatus for handling low-temperature water according to claim 1, wherein the stator and the drive circuit in the DC pump are potted with resin. 5. A direct current pump is connected to a power supply cord in which a gap between electric wires in a power supply cord outside a case is drained by embedding processing to prevent water from entering a drive circuit part in the case due to a capillary phenomenon. The apparatus for handling low-temperature water according to any one of claims 1 to 4, wherein the apparatus is used. 6. The apparatus for handling low-temperature water according to claim 1, wherein the DC pump has a case made of resin. 7. The equipment for handling low-temperature water according to claim 1, wherein the DC pump has a stator core in which a case and an insulator are integrally formed of resin.