JP6401622B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner that simultaneously performs a cooling operation by refrigerant circulation and a water cooling operation by cold water circulation in summer, and a heating operation by refrigerant circulation and a hot water heating operation by warm water circulation such as floor heating in winter. .

In a conventional air conditioner, an outdoor unit is divided into upper and lower parts by a horizontal partition plate, a refrigeration circuit chamber is formed at the lower part of this partition plate, and a hot water circuit chamber is formed at the upper part. The hot water circuit room is equipped with a water-refrigerant heat exchanger, a hot water tank, a circulation pump and a hot water header. The indoor unit equipped with the hot water header and the indoor heat exchanger is connected with hot water. Connected by piping, connecting the compressor, water-refrigerant heat exchanger, expansion valve, evaporator, etc. to form a refrigerant circulation circuit, water-refrigerant heat exchanger, hot water tank, circulation pump, hot water communication A pipe and an indoor heat exchanger are connected to form a hot water circulation circuit, and the heat pumped up from the evaporator in the refrigerant circulation circuit is transmitted to the hot water circulation path by the water-refrigerant heat exchanger, and the indoor heat exchanger Heat pump type hot water heating system that heats indoors with heat The evaporator is formed by a fin tube type heat exchanger, and a radiator is provided integrally with the evaporator in a refrigerant circulation circuit between the water-refrigerant heat exchanger and an expansion valve. By being positioned at the lower end on the leeward side of the evaporator, it is possible to prevent frost from remaining in the defrosting operation during the heating operation and to improve the efficiency of the defrosting.
In addition, since this air conditioner was only operated in the winter season, the circulation pump in the water circuit did not condense. (For example, see Patent Document 1)

JP 2010-144965 A

  Since the heat pump type hot water heating device of this conventional example is a dedicated machine for heating operation, the outdoor temperature where the outdoor unit is installed is the same as the outdoor temperature, and since the operation is performed only in winter, the water temperature of the water circuit is low at the start of operation Even in such cases, it was not necessary to take measures against condensation on the surface of the circulating pump (such as attaching a heat insulating material on the surface to prevent condensation or providing a drainage for the generated condensed water). However, when cooling operation is performed by switching the refrigeration circuit to cool the water circuit in summer in order to cool and heat with radiant heat like a cold / hot water panel, the temperature difference between the water temperature of the water circuit and the outside air temperature As a result, the water circuit needs countermeasures against condensation. In particular, since the water temperature passing through the circulation pump is low, a lot of condensed water is generated on the surface, and the circulation pump vibrates. There was a cost increase for each.

The present invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the structure of the outdoor unit is divided into two parts by a horizontal partition plate, a refrigeration circuit chamber is provided at the bottom of the case, and water is provided at the top of the case. forming a circuit chamber, the compressor and the four-way valve in the refrigeration circuit chamber, an expansion valve, comprising the outdoor heat exchanger, water to the water circuit chamber - equipped refrigerant heat exchanger and the tank, a circulation pump, the indoor unit An indoor heat exchanger is provided, and the compressor, a four-way valve, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger are connected by a refrigerant pipe to form a refrigeration circuit, and a water-refrigerant is parallel to the indoor heat exchanger. A heat exchanger is connected, and the water-refrigerant heat exchanger is connected to a tank, a circulation pump, a header unit, and a terminal by water pipes to form a water circuit. By switching the refrigeration circuit, cooling operation in the indoor unit Or heating operation, circulating cold / hot water to the water circuit, and water-cooling operation or hot water heating operation at the terminal In the air conditioner to be used, the circulating pump is fixed by a pump mounting bracket, and a drain pan for receiving condensed water on the surface of the circulating pump is provided below the pump mounting bracket, and the drain pan is made of rubber or a flexible material. It is made of resin, and the pump mounting bracket is fixed to the horizontal partition plate through the drain pan.

According to the present invention, the material of the drain pan that receives the condensed water generated in the circulating pump during the cooling operation by the water circuit in summer is formed of rubber or flexible resin, and the pump mounting bracket is connected to the horizontal partition plate via the drain pan. By fixing to the drain pan, it is possible to combine the function of draining drain water with dew condensation and the function of alleviating the vibration of the circulation pump, thereby reducing the number of structural parts and facilitating assembly work. Manufacturing costs can be reduced.
Moreover, the performance of an outdoor heat exchanger can be improved by cooling an outdoor heat exchanger with dew condensation water.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The exploded explanatory view of the principal part. The perspective view of the principal part.

Next, an air conditioner according to the present invention will be described with reference to an embodiment shown in the drawings.
Reference numeral 1 denotes an outdoor unit of an air conditioner, which is divided into two upper and lower chambers by a horizontal partition plate 2, which includes a refrigeration circuit chamber 3 at a lower portion and a water circuit chamber 4 at an upper portion, and an indoor unit 6 by a refrigerant communication pipe 5. Are connected to the header unit 8 by a water communication pipe 7.
The header unit 8 is a header 9 provided in the interior, and a water circuit 10 is branched and connected in parallel to a number of terminals such as a radiation panel 11 and is opened and closed to adjust the amount of water to each radiation panel 11. A valve 12 is provided.
Inside the refrigeration circuit chamber 3, a compressor 13, a four-way valve 14, an outdoor heat exchanger 15, various valve devices 16, a blower fan 17, a refrigeration circuit controller 18 and the like are provided.
Inside the water circuit chamber 4, a water-refrigerant heat exchanger 19, an auxiliary heater 20, a water tank 21, a circulation pump 22, a water circuit controller 23, and the like are provided.
The indoor unit 6 includes a fin tube type indoor heat exchanger 24, an indoor fan 25, and an indoor control unit 26.

Reference numeral 27 denotes a refrigeration circuit in which the compressor 13 and the four-way valve 14, the water-refrigerant heat exchanger 19, various valve devices 16, and the outdoor heat exchanger 15 are communicated with each other through a refrigerant pipe 28. A branch pipe 29 for branching the refrigerant to the water-refrigerant heat exchanger 19 side and the indoor heat exchanger 24 side is branched between the water heater 19 and the outdoor heat exchanger 15. A tube 30 is provided.
The branch pipe 29 and the branch pipe 30 are connected to the indoor heat exchanger 24 via the refrigerant connection valve 31 and the refrigerant communication pipe 5.

  The outdoor heat exchanger 15 is a fin-tube heat exchanger in which a large number of thin plate-like aluminum fins are penetrated by copper pipes. The refrigerant flow path is divided into upper and lower parts, the upper refrigerant flow path 32 is large, and the lower part thereof A relatively small lower refrigerant flow path 33 is provided.

The various valve devices 16 are composed of three expansion valves, an expansion valve A, an expansion valve B, a two-way valve C, an expansion valve D, and a two-way valve E, and two two-way valves. It has been.
An expansion valve A is provided between the water-refrigerant heat exchanger 19 and the branch pipe 29, an expansion valve B is provided between the branch pipe 30 and the refrigerant connection valve 31, and between the branch pipe 29 and the refrigerant connection valve 31. Is provided with a two-way valve C, and an expansion valve D is provided on a connecting pipe 34 connecting the upper refrigerant flow path 32 and the lower refrigerant flow path 33 of the outdoor heat exchanger 15.

  Reference numeral 35 denotes a bypass pipe that connects between the compressor 13 and the four-way valve 14 and between the expansion valve D and the upper refrigerant flow path 32. The two-way valve E provided in the bypass pipe 35 defrosts the heating operation. It is sometimes opened, and the hot gas of the compressor 13 is sent to the upper refrigerant flow path 32.

  The radiant panel 11 is installed on the floor, and a heat radiating surface (heat absorbing surface) is installed along the floor warming panel 11a and the side wall for flowing warm water inside the panel to heat the floor, and flowing cold water or hot water inside, It is the cold / hot water panel 11b which performs air conditioning by radiation from the side, and these several radiation panels 11 perform air conditioning with the cold / hot water branched in parallel by the said header 9. FIG.

  A pump mounting bracket 36 having a U-shaped cross section is fixed to the screw boss 39 formed on the side surface of the circulating pump 22 by three screws 40 from the left and right through left and right mounting holes 38 provided in the side plate 37. . In addition, upper and lower mounting holes 42 are provided in the four corners of the bottom surface of the pump mounting bracket 36 for passing through the drain pan 41 and screwing to the horizontal partition plate 2.

  The drain pan 41 is for receiving condensed water condensed on the surface of the circulation pump 22, and is provided with a convex portion 43 protruding upward in a cylindrical shape corresponding to the upper and lower mounting holes 42 of the pump mounting bracket 36, The upper end of the convex portion 43 is provided with a step portion 44 to be inserted inside the vertical mounting hole 42. Further, the drain pan 41 is provided with a downward slope toward the one side wall 45, and two drain holes 46 are provided from the side wall 45 to the bottom surface.

The drain hole 46 is provided so as to protrude from the bottom surface in an edge shape, and is fitted and protrudes downward from the partition plate drain hole 47 provided in the horizontal partition plate 2. Further, the horizontal partition plate 2 facing the vertical mounting hole 42 of the pump mounting bracket 36 and the convex portion 43 of the drain pan 41 is a screw that passes through the vertical mounting hole 42 and the convex portion 43 and fixes a long screw 48 with screws. A hole 49 is provided.

  The installation of the circulating pump 22 will be described. First, the circulating pump 22 is mounted on the pump mounting bracket 36, and three screws 40 from the side are passed through the left and right mounting holes 38 and screwed to the screw bosses 39 to fix the pump mounting bracket 36. Next, the drainage hole 46 of the drain pan 41 is placed on the partition plate drainage hole 47 of the horizontal partition plate 2, which is attached to the circulation pump 22. 41 so that the convex part 43 of 41 is put in, and the four long screws 48 are inserted into the upper and lower mounting holes 42 from above and fixed with screws, so that the vibration of the circulation pump 22 is mitigated by the convex part 43 of the flexible drain pan 41. To do.

  Further, the drainage path of the dew condensation water generated by the circulation pump 22 will be described. The dew condensation water generated on the surface of the circulation pump 22 is collected by the entire drain pan 41 and passes through the drainage hole 46 and the partition plate drainage hole 47 to be separated. It flows to the upper part of the outdoor heat exchanger 15 located below the plate drain hole 47 and cools the high-temperature outdoor heat exchanger 15, and the dewed water remaining without being evaporated in the outdoor heat exchanger 15 is the outdoor heat exchange. The water is drained from the base (not shown) of the housing from the bottom of the vessel 15.

  In this way, the drain pan 41 can be used for both the function of draining and draining the condensed water and the function of reducing the vibration of the circulation pump 22, thereby reducing the number of structural parts and facilitating the assembly work. Manufacturing costs can be reduced.

In the cooling operation of the indoor unit 6, the four-way valve 14 is switched to the cooling side, the expansion valve A is fully closed, the expansion valve B is opened according to the cooling capacity, the two-way valve C is opened, and the expansion valve D is fully opened. In addition, the two-way valve E is closed, and the high-temperature refrigerant pressurized by the compressor 1 dissipates heat by passing through the four-way valve 14, the upper refrigerant channel 32, the expansion valve D, and the lower refrigerant channel 33. Then, the pressure is reduced by the expansion valve B, the temperature is lowered by the indoor heat exchanger 24, and cooling is performed by sending cold air into the room by the indoor blower fan 25.

  In cooling operation with cold water in the cold / hot water panel (radiant panel 11), the four-way valve 14 is switched to the cooling side, the expansion valve A is opened according to the cooling capacity, the expansion valve B is fully closed, and the two-way valve C Is closed, the expansion valve D is fully closed, and the two-way valve E is closed, so that the high-temperature refrigerant pressurized by the compressor 1 is the four-way valve 14, the upper refrigerant flow path 32, the expansion valve D, the lower refrigerant flow. Heat is dissipated by passing through the passage 33, the pressure is reduced by the expansion valve A, the water-refrigerant heat exchanger 19 is cooled, and cold water is circulated in the water circuit 10.

  The water circuit 10 includes a water-refrigerant heat exchanger 19, an auxiliary heater 20, a water tank 21, and a circulation pump 22, and a water pipe 50 connected to the radiation panel 11 via the header 9 and the water communication pipe 7 of the header unit 8. In the water circuit 10 communicated with each other, the circulation amount of water is adjusted by connecting the circulation pump 22 and the header 9 and between the header 9 and the water-refrigerant heat exchanger 19 by a bypass circuit 51. A water connection valve 52 connects the water communication pipe 7 and the header unit 8.

  In the heating operation with hot water, the four-way valve 14 is set to the heating side, the expansion valve A is fully opened, the expansion valve B is fully closed, the two-way valve C is closed, the expansion valve D is opened according to the heating capacity, When the direction valve E is closed, the high-temperature refrigerant pressurized by the compressor 1 heats the water circuit 10 by the four-way valve 14 and the water-refrigerant heat exchanger 19 and performs heating by the radiation panel 11. .

  In the combined heating operation of the indoor unit and the radiant panel 11, the four-way valve 14 is set to the heating side, the expansion valve A is set to an opening corresponding to the heating capacity, and the expansion valve B is set to an opening corresponding to the heating capacity. The expansion valve D opens at an opening corresponding to the heating capacity, and the two-way valve E closes, so that the expansion valve A and the expansion valve can be selected according to the importance of heating and hot water heating in the indoor unit and the user's preference. After adjusting the opening degree of B to adjust the amount of heat distribution on the indoor unit side and the hot water heating side, the opening degree is adjusted so that appropriate refrigerant is evaporated in the upper refrigerant flow path 32 by the expansion valve D To do.

The compressor 3 changes the rotational speed in multiple stages according to the amount of heat required by an inverter drive circuit (not shown) provided in the refrigeration circuit controller 18.
The expansion valves A, B, and D are electronic expansion valves, the opening degree of which is controlled by the refrigeration circuit control unit 18 according to the rotational speed of the compressor 14, the temperature of each part of the refrigeration circuit, and the like. Is opened and closed by the refrigeration circuit controller 18 according to the operation mode.
The blower fan 17 is a resin propeller fan, which is rotated by a blower motor (not shown) having a variable rotation speed, and blows air to the outdoor heat exchanger 16 to perform heat exchange.

The indoor unit 6 is driven by an indoor blower fan 25, sucks indoor air from suction ports (not shown) provided on the front surface and the upper surface, exchanges heat with the indoor heat exchanger 24, and then prepares at the lower front surface. The air whose temperature is adjusted is blown into the room from the air outlet (not shown).
A refrigerant connection valve 53 connects the indoor unit 6 and the refrigerant communication pipe 5.

  The water-refrigerant heat exchanger 19 is composed of a double pipe having an inner pipe inserted into the outer pipe. The outer surface of the inner pipe is configured so that a large number of fins are erected to increase the heat exchange efficiency inside and outside the inner pipe. By making a hot water path (not shown) through which water passes inside the inner pipe of the double pipe and a refrigerant path (not shown) through which refrigerant passes between the inner pipe and the outer pipe, It is possible to heat the water passing through the heat exchange.

  Reference numeral 54 denotes a discharge temperature sensor attached to the refrigerant pipe on the discharge side of the compressor 13, which measures the discharge temperature of the compressor 13 and sends a signal to the refrigeration circuit control unit 18. 55 is an outside air temperature sensor provided on the upstream side of the outdoor air flow path (not shown) in the refrigeration circuit chamber 3, and measures the outside air temperature. A heat exchange sensor 56 is attached to the outdoor heat exchanger 15 and measures the temperature of the outdoor heat exchanger 15 to control the defrosting operation. Reference numeral 57 denotes a refrigerant intermediate sensor that is attached to the middle of the water-refrigerant heat exchanger 19 and measures the temperature of the refrigerant.

  An outgoing water sensor 58 is attached to the water pipe between the water-refrigerant heat exchanger 19 and the auxiliary heater 20 and measures the pipe temperature. A heater pipe sensor 59 is attached to the water pipe between the auxiliary heater 20 and the water tank 21 and measures the pipe temperature. Reference numeral 60 denotes a return water temperature sensor which is attached to a water pipe between the radiation panel 11 and the water-refrigerant heat exchanger 19 and measures the pipe temperature. 61 is a safety thermo that detects overheating of the auxiliary heater 20, and two are attached to the upper surface of the auxiliary heater 20. A room temperature sensor 62 is provided on the indoor air suction side.

As described above, in the summer, the indoor air-cooling operation and the cooling operation using the cold water are performed by the cold air from the cooled indoor heat exchanger, and in the winter season, the heating operation by the hot air from the heated indoor heat exchanger and the water are performed. -Combined heating operation in which heating operation by the radiation panel 11 such as floor heating performed with hot water from the hot water circuit via the refrigerant heat exchanger is performed simultaneously, and the amount of refrigerant passing through the indoor heat exchanger and water-refrigerant heat exchange The amount of refrigerant passing through the vessel can be adjusted accurately.
In addition, the drain pan that receives the condensed water generated in the circulating pump during cooling operation by the water circuit in summer is formed of rubber or flexible resin, and the pump mounting bracket is fixed to the horizontal partition plate via this drain pan. Therefore, the drain pan can be used for both draining and draining the condensed water, and reducing the vibration of the circulation pump, reducing the number of structural parts and facilitating assembly work, thereby reducing manufacturing costs. Is something that can be done.

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Horizontal partition plate 6 Indoor unit 8 Header unit 10 Water circuit 11 Radiation panel 22 Circulation pump 36 Pump mounting bracket 41 Drain pan

Claims (3)

The housing of the outdoor unit is divided into two vertically by a horizontal partition plate, a refrigeration circuit chamber is formed at the bottom of the housing, a water circuit chamber is formed at the top of the housing, a compressor, a four-way valve, an expansion valve, comprising the outdoor heat exchanger, water to the water circuit chamber - refrigerant heat exchanger and the tank, provided with a circulation pump, having an indoor heat exchanger in the indoor machine, the compressor and the four-way valve, an indoor heat exchanger, an expansion A refrigeration circuit is configured by connecting a valve and an outdoor heat exchanger with a refrigerant pipe, and a water-refrigerant heat exchanger is connected in parallel with the indoor heat exchanger, the water-refrigerant heat exchanger and a tank, a circulation pump, A header unit and a terminal are connected by a water pipe to form a water circuit. By switching the refrigeration circuit, a cooling operation or a heating operation is performed in the indoor unit. In an air conditioner that performs cooling operation or hot water heating operation, the circulation pump is fixed with a pump mounting bracket. Is, the drain pan for receiving the condensed water condensed on the surface of the circulation pump below the pump mounting bracket is provided, the material of the drain pan formed of a rubber or flexible resin, the said pump mounting bracket through the drain pan An air conditioner characterized by being fixed to a horizontal partition plate. Wherein the drain pan protrusion protruding upward is provided in a cylindrical shape corresponding to the upper and lower mounting holes of the pump mounting hardware, the upper end of the convex portion is provided with a stepped portion to be inserted in the vertical mounting hole inside the drain pan bottom 2. The air conditioner according to claim 1, wherein a slope is provided toward one side wall and a drainage hole is provided from the side wall to the bottom surface.   The air conditioner according to claim 1 or 2, wherein the condensed water flows from the drain hole of the drain pan to the surface of the outdoor heat exchanger after being drained.

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