JP2013139932A - Refrigeration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an increase in cost associated with attachment of a temperature sensor to a heat exchanger made of aluminum.SOLUTION: An outdoor heat exchanger 13 made of aluminum is positioned in a blower chamber S1. A sensor holding part 44 is provided at a bracket 40 made of aluminum for attaching the outdoor heat exchanger 13 made of aluminum to the inside of the blower chamber S1. The bracket 40 has: an attaching piece 43 fixed to a side plate at a blower chamber side of a unit casing; and a pinching piece 42 brazed to a header collector pipe 35.

Description

  The present invention relates to a refrigeration apparatus, and more particularly to a refrigeration apparatus including a heat exchanger made of aluminum or aluminum alloy.

  In recent years, in order to reduce the weight of a heat exchanger, aluminum or an aluminum alloy is sometimes used not only for the fins of the heat exchanger but also for the heat transfer tubes and header collecting tubes of the heat exchanger. A temperature sensor such as a thermistor is attached to a heat exchanger made of aluminum or an aluminum alloy for the purpose of temperature detection for control. For example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2011-69543), conventionally, in the case of a heat exchanger made of aluminum or aluminum alloy, a temperature sensor is attached using a dedicated holding member. ing.

  By the way, since the direct contact of the non-aluminum metal with the heat exchanger made of aluminum or aluminum alloy causes corrosion of the heat exchanger, such a dedicated holding member may be made of aluminum or aluminum alloy. I need it. Therefore, if a dedicated holding member made of aluminum or aluminum alloy is prepared and the header collecting pipe is processed to attach the holding member to the header collecting pipe or the like of the heat exchanger, the cost of the refrigeration apparatus including the heat exchanger is increased. Will rise.

  An object of the present invention is to suppress an increase in cost due to the attachment of a temperature sensor to a heat exchanger made of aluminum or aluminum alloy.

  A refrigeration apparatus according to a first aspect of the present invention includes a casing component member, an aluminum or aluminum alloy heat exchanger disposed in a space surrounded by the casing component member, and an aluminum or aluminum alloy product. A temperature sensor for detecting the temperature of the heat exchanger, a fixed part fixed to the casing component, a fixing part directly attached to the heat exchanger made of aluminum or aluminum alloy, and a holding part for holding the temperature sensor And an aluminum or aluminum alloy bracket.

  In the refrigeration apparatus according to the first aspect, since the holding unit for holding the temperature sensor is provided in the bracket made of aluminum or aluminum alloy for fixing the heat exchanger to the casing constituent member, the temperature sensor is made of aluminum or A dedicated holding member for attachment to the aluminum alloy heat exchanger can be omitted, and the cost can be reduced.

  The refrigeration apparatus according to the second aspect of the present invention is the refrigeration apparatus according to the first aspect, wherein the bracket is formed with a cylindrical hole, and the temperature sensor is formed in the cylindrical hole of the bracket made of aluminum or aluminum alloy. It has an insertable aluminum or aluminum alloy cylinder and a temperature sensing element molded in the cylinder.

  In the refrigeration apparatus according to the second aspect, the aluminum or aluminum alloy cylinder prevents corrosion of the aluminum or aluminum alloy bracket, and at the same time, the temperature sensor is mounted by combining the cylinder and the cylindrical hole. Since the attachment and detachment becomes easy, maintenance becomes easy.

  The refrigeration apparatus according to the third aspect of the present invention is the refrigeration apparatus according to the second aspect, wherein the heat exchanger made of aluminum or aluminum alloy is made of a plurality of aluminum or aluminum alloys arranged such that the side surfaces face each other. A flat tube, an aluminum or aluminum alloy header collecting tube to which a plurality of flat tubes are connected, and a plurality of aluminum or aluminum alloy fins joined to the plurality of flat tubes, The fluid flowing inside the flat tube is configured to exchange heat with the air flowing outside the plurality of flat tubes, and the aluminum or aluminum alloy bracket is formed with an opening connected to the cylindrical hole, and the opening is made of aluminum Alternatively, it is attached to the header collecting pipe so as to face the header collecting pipe made of aluminum alloy.

  In the refrigeration apparatus according to the third aspect, the temperature sensor can be directly brought into contact with the header collecting pipe made of aluminum or aluminum alloy through the opening of the bracket made of aluminum or aluminum alloy, thereby improving the accuracy of temperature detection. it can.

  A refrigeration apparatus according to a fourth aspect of the present invention is the refrigeration apparatus according to the third aspect, wherein the header collecting pipe made of aluminum or aluminum alloy functions as a condenser, and the gas refrigerant or gas out of the plurality of flat tubes is used. Connected to the upper internal space to which the gas refrigerant flat tube for flowing the refrigerant in the liquid two-layer state is connected and the liquid refrigerant flat tube for flowing the gas-liquid two-layer refrigerant or the liquid refrigerant among the plurality of flat tubes A first header collecting pipe made of aluminum or aluminum alloy and a second header collecting pipe made of aluminum or aluminum alloy, each having a lower inner space formed from the upper inner space of the first header collecting pipe The refrigerant flowing in the lower internal space of the collecting pipe is folded once in the second header collecting pipe, and the refrigerant is reciprocated once. Bracket made of onium alloy is arranged around the upper interior space of the aluminum or the second header collecting pipe made of aluminum alloy.

  In the refrigeration apparatus according to the fourth aspect, the periphery of the upper internal space of the second header collecting pipe is not only advantageous for fixing the heat exchanger, but also the upper part of the second header collecting pipe of the heat exchanger having a refrigerant reciprocating structure. Since the refrigerant in the gas-liquid two-layer when the refrigerant folded back once flows in the internal space, it is advantageous for detecting the saturation temperature of the refrigerant necessary for the control.

  In the refrigeration apparatus according to the first aspect, an increase in cost due to the attachment of the temperature sensor to the heat exchanger made of aluminum or aluminum alloy can be suppressed.

  In the refrigeration apparatus according to the second aspect, maintenance can be easily performed, and an increase in cost for maintaining and managing the refrigeration apparatus can be suppressed.

  In the refrigeration apparatus according to the third aspect, when the temperature sensor is attached to the bracket, the accuracy of temperature detection can be improved, and the performance of the refrigeration apparatus can be kept high even if the temperature sensor is attached to the bracket.

  In the refrigeration apparatus according to the fourth aspect, the heat exchanger can be reliably fixed, and at the same time, the performance of the refrigeration apparatus can be improved.

The circuit diagram for demonstrating the outline | summary of a structure of the air conditioning apparatus which concerns on one Embodiment. The perspective view which shows the external appearance of an air-conditioning outdoor unit. The typical top view of the air-conditioning outdoor unit of the state which removed the top plate. The typical rear view which shows schematic structure of an outdoor heat exchanger. The fragmentary sectional view for demonstrating the structure of an outdoor heat exchanger. The expanded sectional view for demonstrating the structure of the heat exchange part of an outdoor heat exchanger. (A) The perspective view which shows the external appearance of a temperature sensor, (b) Typical sectional drawing which shows the outline | summary of a structure of a temperature sensor. (A) The perspective view of the bracket made from aluminum, (b) The top view of a bracket. The partial expansion perspective view which shows the structure of the outdoor heat exchanger of the peripheral part of aluminum brackets. The parts assembly figure for demonstrating attachment of the brackets made from aluminum. The perspective view for demonstrating the structure of bracket periphery made from aluminum.

(1) Overall Configuration of Air Conditioner As a refrigeration apparatus according to one embodiment of the present invention, a refrigeration apparatus used in an air conditioner will be described. FIG. 1 is a circuit diagram showing an outline of an air conditioner. The air conditioner 1 includes an air conditioning outdoor unit 2 and an air conditioning indoor unit 3. This air conditioner 1 is an apparatus used for air conditioning of each room in a building by performing a vapor compression refrigeration cycle operation. The air conditioner 1 includes an air conditioning outdoor unit 2 as a heat source unit, an air conditioning indoor unit 3 as a utilization unit, and refrigerant communication pipes 6 and 7 that connect the air conditioning outdoor unit 2 and the air conditioning indoor unit 3. .

  In the air conditioner 1 configured by connecting the air conditioning outdoor unit 2, the air conditioning indoor unit 3, and the refrigerant communication pipes 6 and 7, the refrigeration apparatus includes a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, The expansion valve 14, the indoor heat exchanger 4, the accumulator 15, and the like are connected by refrigerant piping. A refrigerant is sealed in the refrigeration apparatus, and a refrigeration cycle operation is performed in which the refrigerant is compressed, cooled, decompressed, heated and evaporated, and then compressed again. As the refrigerant, for example, one selected from R410A, R407C, R22, R134a, carbon dioxide, and the like is used.

(2) Operation of the air conditioner (2-1) Cooling operation During the cooling operation, the four-way switching valve 12 is in the state indicated by the solid line in FIG. 1, that is, the discharge side of the compressor 11 is the gas of the outdoor heat exchanger 13. And the suction side of the compressor 11 is connected to the gas side of the indoor heat exchanger 4 via the accumulator 15, the gas refrigerant side shut-off valve 18 and the refrigerant communication pipe 7. The opening of the expansion valve 14 is adjusted so that the degree of superheat of the refrigerant at the outlet of the indoor heat exchanger 4 (that is, the gas side of the indoor heat exchanger 4) is constant. When the compressor 11, the outdoor fan 16, and the indoor fan 5 are operated in the state of the refrigeration apparatus, the low-pressure gas refrigerant is sucked into the compressor 11 and compressed to become a high-pressure gas refrigerant. This high-pressure gas refrigerant is sent to the outdoor heat exchanger 13 via the four-way switching valve 12. Thereafter, the high-pressure gas refrigerant is condensed in the outdoor heat exchanger 13 by exchanging heat with the outdoor air supplied by the outdoor fan 16 to become a high-pressure liquid refrigerant. The high-pressure liquid refrigerant in a supercooled state is sent from the outdoor heat exchanger 13 to the expansion valve 14. Then, the pressure is reduced to near the suction pressure of the compressor 11 by the expansion valve 14 and is sent to the indoor heat exchanger 4 as a low-pressure gas-liquid two-phase refrigerant, and the indoor heat exchanger 4 exchanges heat with the indoor air. And evaporates into a low-pressure gas refrigerant.

  This low-pressure gas refrigerant is sent to the air-conditioning outdoor unit 2 via the refrigerant communication pipe 7, and is again sucked into the compressor 11 via the gas refrigerant-side closing valve 18 and the four-way switching valve 12. Thus, in the cooling operation, the air conditioner 1 uses the outdoor heat exchanger 13 as the refrigerant condenser to be compressed in the compressor 11 and the indoor heat exchanger 4 as the refrigerant condensed in the outdoor heat exchanger 13. To function as an evaporator.

(2-2) Heating operation During the heating operation, the four-way switching valve 12 is in the state indicated by the broken line in FIG. 1, that is, the discharge side of the compressor 11 is placed indoors via the gas refrigerant side shut-off valve 18 and the refrigerant communication pipe 7. It is connected to the gas side of the heat exchanger 4 and the suction side of the compressor 11 is connected to the gas side of the outdoor heat exchanger 13. Moreover, the liquid refrigerant side closing valve 17 and the gas refrigerant side closing valve 18 are opened. The expansion valve 14 is adjusted in opening degree so that the degree of supercooling of the refrigerant at the outlet of the indoor heat exchanger 4 is constant at the target value of the degree of supercooling. When the compressor 11, the outdoor fan 16, and the indoor fan 5 are operated in the state of this refrigeration apparatus, the low-pressure gas refrigerant is sucked into the compressor 11 and compressed to become a high-pressure gas refrigerant, and the four-way switching valve 12, The gas refrigerant side closing valve 18 and the refrigerant communication pipe 7 are sent to the air conditioning indoor unit 3.

  The high-pressure gas refrigerant sent to the air conditioning indoor unit 3 exchanges heat with the indoor air in the indoor heat exchanger 4 to condense into a high-pressure liquid refrigerant, and then passes through the expansion valve 14. Further, the pressure is reduced according to the opening degree of the expansion valve 14. The refrigerant that has passed through the expansion valve 14 flows into the outdoor heat exchanger 13. The low-pressure gas-liquid two-phase refrigerant flowing into the outdoor heat exchanger 13 exchanges heat with the outdoor air supplied by the outdoor fan 16 to evaporate into a low-pressure gas refrigerant. And is again sucked into the compressor 11. Thus, in the heating operation, the air conditioner 1 uses the indoor heat exchanger 4 as a refrigerant condenser compressed in the compressor 11 and the outdoor heat exchanger 13 as a refrigerant condensed in the indoor heat exchanger 4. To function as an evaporator.

  In the cooling operation and the heating operation described above, the temperature and pressure of the refrigerant at various points in the refrigeration apparatus are detected to control the refrigeration apparatus. As shown in FIG. 1, the outdoor heat exchanger 13 is provided with a temperature sensor 50 for detecting the temperature of the refrigerant flowing inside the outdoor heat exchanger 13.

(3) Detailed configuration of air conditioner (3-1) Air-conditioning indoor unit The air-conditioning indoor unit 3 is installed on a wall surface of the room by wall hanging or the like, or embedded or suspended on a ceiling of a room such as a building. The air conditioning indoor unit 3 has an indoor heat exchanger 4 and an indoor fan 5. The indoor heat exchanger 4 is, for example, a cross fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins, and functions as a refrigerant evaporator during cooling operation to cool indoor air. In the heating operation, the heat exchanger functions as a refrigerant condenser and heats indoor air.

(3-2) Air Conditioning Outdoor Unit The air conditioning outdoor unit 2 is installed outside a building or the like, and is connected to the air conditioning indoor unit 3 installed indoors through the refrigerant communication pipes 6 and 7. The air conditioner outdoor unit 2 includes a substantially rectangular parallelepiped unit casing 20 as shown in FIGS. 2 and 3. As shown in FIG. 3, the air conditioner outdoor unit 2 has a structure in which the blower chamber S1 and the machine chamber S2 are formed by dividing the internal space of the unit casing 20 into two by a partition plate 28 extending in the vertical direction. (So-called trunk type structure). As shown in FIG. 3, an outdoor heat exchanger 13 and an outdoor fan 16 are disposed in the blower room S1. Further, in the machine room S2, the compressor 11 and the accumulator 15 shown in FIG. 3, the four-way switching valve 12, the expansion valve 14, the liquid refrigerant side closing valve 17 and the gas which are not shown in FIG. A refrigerant side closing valve 18 and the like are arranged.

  The unit casing 20 includes a top plate 21, a bottom plate 22, a blower chamber side plate 23, a machine chamber side plate 24, a blower chamber side front plate 25, and a machine chamber side front plate 26. . The top plate 21 is a plate-shaped member made of a steel plate that constitutes the top surface portion of the unit casing 20. The bottom plate 22 is a plate-shaped member made of a steel plate that constitutes the bottom portion of the unit casing 20. The blower chamber side plate 23 is a plate-shaped member made of a steel plate that forms a side surface portion of the unit casing 20 near the blower chamber S1. The machine room side plate 24 is a plate-shaped member made of steel plate that constitutes a part of a side surface portion of the unit casing 20 near the machine room S2 and a back surface portion of the unit casing 20 near the machine room S2. The blower chamber side front plate 25 is a plate-like member made of steel plate that constitutes the front portion of the blower chamber S1 of the unit casing 20 and a part of the front portion of the machine chamber S2 of the unit casing 20. The blower chamber side front plate 25 and the blower chamber side plate 23 may be formed integrally by press-molding a single steel plate.

  The air conditioning outdoor unit 2 is configured to suck outdoor air into the blower chamber S <b> 1 in the unit casing 20 from a part of the back surface and side surface of the unit casing 20 and blow out the sucked outdoor air from the front surface of the unit casing 20. . Therefore, the outdoor air suction port 20a sucked into the blower chamber S1 in the unit casing 20 is between the rear end portion of the blower chamber side plate 23 and the end portion of the machine chamber side plate 24 on the blower chamber S1 side. The outdoor air inlet 20b is formed in the blower chamber side plate 23. Further, a blower chamber side front plate 25 is provided with an outlet 20c for blowing the outdoor air sucked into the blower chamber S1 to the outside. The front side of the air outlet 20c is covered with a fan grill 25a.

  The outdoor heat exchanger 13 is placed in the blower chamber S1 which is a space covered with the top plate 21, the bottom plate 22, the blower chamber side plate 23, the blower chamber side front plate 25, the partition plate 28, and a part of the machine chamber side plate 24. It is arranged upright in the vertical direction (vertical direction). The outdoor heat exchanger 13 has an L shape in plan view and faces the suction ports 20a and 20b. The outdoor heat exchanger 13 is an aluminum heat exchanger. In order to prevent corrosion, the aluminum outdoor heat exchanger 13 includes a steel plate top plate 21, a bottom plate 22, a blower chamber side plate 23, a machine chamber side plate 24, and a partition plate by means of an aluminum bracket described later. It is attached to the unit casing 20 so as not to come into direct contact with 28 or the like. One end of the outdoor heat exchanger 13 is connected to the four-way switching valve 12, and the other end is connected to the expansion valve 14.

(3-2-1) Outdoor Heat Exchanger Next, the configuration of the outdoor heat exchanger 13 will be described in detail with reference to FIGS. 4, 5, and 6. The aluminum heat exchanger includes an aluminum heat transfer fin 32, an aluminum flat multi-hole pipe 33, and aluminum header collecting pipes 34 and 35. The outdoor heat exchanger 13 includes a heat exchanging portion 31 that exchanges heat between the outdoor air and the refrigerant. The heat exchanging portion 31 includes a large number of aluminum heat transfer fins 32 and a large number of flat aluminum plates. It consists of a hole tube 33. When the heat exchanging unit 31 functions as a condenser, a gas refrigerant flat multi-hole tube 33a for flowing a gas refrigerant or a gas-liquid two-layer refrigerant out of the many flat multi-hole tubes 33 is disposed. An upper heat exchanging portion 31a and a lower heat exchanging portion 31b to which a liquid refrigerant flat multi-hole tube 33b for flowing a gas-liquid two-layer refrigerant or liquid refrigerant out of a number of flat multi-hole tubes 33 are connected. doing.

  The flat multi-hole tube 33 functions as a heat transfer tube, and exchanges heat moving between the heat transfer fins 32 and the outdoor air between the refrigerant flowing inside and the heat transfer fins 32.

  The outdoor heat exchanger 13 includes aluminum header collecting pipes 34 and 35, one on each end of the heat exchanging section 31. The header collecting pipe 34 has an aluminum cylindrical pipe structure, and has internal spaces 34a and 34b partitioned from each other by an aluminum baffle 34c. An aluminum heat exchanger side gas pipe 38 is connected to the upper internal space 34a, and an aluminum heat exchanger side liquid pipe 39 is connected to the lower internal space 34b.

  The header collecting pipe 35 has an aluminum cylindrical pipe structure, and is partitioned by aluminum baffles 35f, 35g, 35h, and 35i to form internal spaces 35a, 35b, 35c, 35d, and 35e. A number of flat multi-hole pipes 33a for gas refrigerant connected to the internal space 34a above the header collecting pipe 34 are connected to the three internal spaces 35a, 35b, 35c of the header collecting pipe 35. A number of flat multi-hole pipes 33 b for liquid refrigerant connected to the internal space 34 b below the header collecting pipe 34 are connected to the three internal spaces 35 c, 35 d, and 35 e of the header collecting pipe 35.

  Further, the internal space 35a and the internal space 35e of the header collecting pipe 35 are connected by an aluminum connecting pipe 36, and the internal space 35b and the internal space 35d are connected by an aluminum connecting pipe 37. The internal space 35c also has a function of connecting a part of the upper internal space (part connected to the internal space 34a) and a part of the lower internal space (part connected to the internal space 34b) of the heat exchange unit 31. Plays. With these configurations, for example, during cooling operation (when functioning as a condenser), the gas refrigerant supplied to the internal space 35a above the header collecting pipe 35 by the heat exchanger-side gas pipe 38 made of aluminum is subjected to heat exchange. Heat exchange is performed at the upper part of the part 31, and a part is liquefied to form a gas-liquid two-layer state, folded back at the header collecting pipe 35, and the remaining gas refrigerant is liquefied through the lower part of the heat exchange part 31 to form aluminum. It goes out from the heat exchanger side liquid pipe 39 made of the product.

  In order to measure the saturation temperature of the refrigerant flowing through the outdoor heat exchanger 13, the temperature sensor 50 is attached around an internal space 35a that is an upper internal space of the header collecting pipe 35 where the refrigerant flow is turned back. The attachment positions are preferably the internal spaces 35a and 35b rather than the internal space 35c in which the upper internal space and the lower internal space are connected and integrated. Further, the temperature sensor 50 is preferably attached above the middle of the inner spaces 35a and 35b because the gas refrigerant accumulates at the top and the liquid refrigerant at the bottom.

  FIG. 6 is a partially enlarged view showing a cross-sectional structure when cut along a plane perpendicular to the longitudinal direction of the flat multi-hole tube 33 of the heat exchange section 31 of the outdoor heat exchanger 13. The heat transfer fins 32 are thin aluminum flat plates, and each heat transfer fin 32 has a plurality of cutouts 32a extending in the horizontal direction. The flat multi-hole tube 33 has upper and lower flat portions serving as heat transfer surfaces and a plurality of internal flow paths 331 through which the refrigerant flows. The flat multi-hole tubes 33 that are slightly thicker than the upper and lower widths of the cutouts 32a are spaced apart in a state where the flat portions are directed upward and downward (a state in which the side surfaces of the flat multi-hole tubes 33 face each other). Are arranged in a plurality of stages and temporarily fixed in a state of being fitted into the notches 32a. Thus, the heat transfer fin 32 and the flat multi-hole tube 33 are brazed in a state where the flat multi-hole tube 33 is fitted in the notch 32 a of the heat transfer fin 32. Further, both ends of each flat multi-hole pipe 33 are fitted into the header collecting pipes 34 and 35 and brazed.

  The internal spaces 34a and 34b of the header collecting pipe 34 and the internal spaces 35a, 35b, 35c, 35d and 35e of the header collecting pipe 35 and the internal flow path 331 of the flat multi-hole pipe 33 are connected. The internal spaces 34a, 34b of the header collecting pipe 34 and the internal spaces 35a, 35b, 35c, 35d, 35e of the header collecting pipe 35 are provided with a rectifying plate for adjusting the flow of the refrigerant. The detailed description is omitted.

(3-2-2) Temperature Sensor FIG. 7 shows a temperature sensor 50, FIG. 7 (a) is a perspective view showing the appearance of the temperature sensor, and FIG. 7 (b) is a diagram of the configuration of the temperature sensor. It is a typical sectional view showing an outline. The temperature sensor 50 mainly includes a temperature sensing element 51 such as a thermistor, a lead wire 52, an electric wire 53 such as a harness, an aluminum case 54, and a mold resin 55. A lead wire 52 is connected to the temperature sensing element 51, and a signal to be converted according to temperature is transmitted to the lead wire 52. The lead wire 52 is connected to the electric wire 53, and a signal corresponding to the temperature is transmitted to the control unit (not shown) of the air conditioner outdoor unit 2 through the electric wire 53. The temperature sensitive element 51, the lead wire 52, and the electric wire 53 are enclosed in a cylindrical aluminum case 54 with a mold resin 55 such as epoxy.

(3-2-3) Mounting bracket for outdoor heat exchanger and temperature sensor The temperature sensor 50 also serves as a mounting bracket for mounting the outdoor heat exchanger 13. Here, what is used as a temperature sensor among the mounting brackets for mounting the outdoor heat exchanger 13 will be described. FIG. 8 shows an aluminum bracket 40 having the sensor holding part 44 for holding the temperature sensor 50 while attaching the outdoor heat exchanger 13 to the blower room side plate 23. FIG. 8A is a perspective view of the aluminum bracket 40, and FIG. 8B is a plan view of the aluminum bracket 40.

  The bracket 40 is formed, for example, by pressing a single aluminum plate. Two clamping pieces 42 attached to the header collecting pipe 35 of the outdoor heat exchanger 13 extend from the main body 41 of the bracket 40. The sandwiching piece 42 is formed in an arc shape along the outer periphery of the cylindrical header collecting pipe 35. Two mounting pieces 43 extend on the side of the bracket 40 opposite to the clamping piece 42. The attachment piece 43 is provided with a through hole 43a for allowing a screw to pass when attaching to the blower chamber side plate 23 or the like. The main body portion 41 is provided with a sensor holding portion 44 formed in a concave shape. It can be seen that the shape of the sensor holding portion 44 is formed with a cylindrical hole 44a and a slit 44b. The slit 44 b formed on the side facing the header collecting pipe 35 is for bringing the temperature sensor 50 held by the sensor holding portion 44 into contact with the header collecting pipe 35.

  A state in which the bracket 40 made of aluminum is brazed to the header collecting pipe 35 is shown in FIG. Brazing of the bracket 40 to the header collecting pipe 35 is performed, for example, in a state where a brazing material is formed in advance on the surface of the header collecting pipe 35 and the bracket 40 is temporarily fixed with the header collecting pipe 35 sandwiched between the holding pieces 42. The heat transfer fin 32 made of aluminum and the flat multi-hole tube 33 made of aluminum are put in a furnace.

  The bracket 40 is attached around the inner space 35a shown in FIG. The inner dimension of the cylindrical hole formed by the sensor holding portion 44 of the bracket 40 and the header collecting pipe 35 is formed to be slightly smaller than the outer dimension of the case 54 of the temperature sensor 50. In such a case, the case 54 is slightly deformed by strongly pushing the temperature sensor 50 into the case 54, and the temperature sensor 50 is fixed in a cylindrical hole formed by the sensor holding portion 44. Alternatively, in the case where the inner dimension of the cylindrical hole is larger than the outer dimension of the case 54 of the temperature sensor 50, resin, rubber, or the like is interposed in the gap between the cylindrical hole and the temperature sensor 5. 54 is fixed to the sensor holding portion 44.

  Since the bracket 40 is made of aluminum, when the bracket 40 is brought into direct contact with the blower chamber side plate 23 made of a steel plate, corrosion of the bracket 40 is promoted due to contact between iron and aluminum, which are metals having different ionization tendencies. The Therefore, as shown in FIG. 10, a resin cover 47 is attached to the bracket 40, and the resin cover 47 is interposed between the blower chamber side plate 23 and the bracket 40. An iron mounting plate 48 is arranged inside the resin cover 47 in a state separated from the bracket 40 by the resin cover 47. The mounting plate 48 is formed with a screw hole 48 a into which a screw passing through the through hole 43 a of the bracket 40 and the opening 47 a of the resin cover 47 is fitted.

  As shown in FIG. 11, a windproof plate 60 is attached inside the blower chamber S <b> 1 rather than the bracket 40. This windproof plate 60 prevents the wind from hitting the sensor holding portion 44 of the bracket 40, so that the accuracy of temperature detection is improved.

(4) Features of refrigeration equipment (4-1)
In the above-described air conditioner 1, the top plate 21, the bottom plate 22, the blower chamber side plate 23, the machine chamber side plate 24, the blower chamber side front plate 25, and the partition plate 28 made of steel plates (non-aluminum metal) (casing configuration). An outdoor heat exchanger 13 made of aluminum is disposed in the blower chamber S1 (space) surrounded by the members. A plurality of aluminum brackets for mounting the aluminum outdoor heat exchanger 13 in the blower chamber S1 are used, and an aluminum bracket 40 for mounting the outdoor heat exchanger 13 on the blower chamber side plate 23 is included. Is provided with a sensor holding portion 44 (holding portion). The bracket 40 includes a mounting piece 43 (fixed portion) fixed to the blower chamber side plate 23 of the unit casing 20 and a clamping piece 42 (fixed portion) brazed to the header collecting pipe 35.

  Thereby, a temperature sensor is attached to the aluminum bracket 40 for fixing the aluminum outdoor heat exchanger 13 to the blower chamber side plate 23 made of steel plate surrounded by the steel plate (non-aluminum metal plate). Since the sensor holding part 44 for holding 50 is provided, a dedicated holding member for attaching the temperature sensor 50 to the aluminum outdoor heat exchanger 13 can be omitted. The cost can be reduced by omitting the dedicated holding member, and an increase in cost due to the attachment of the temperature sensor 50 to the aluminum outdoor heat exchanger 13 can be suppressed.

(4-2)
The aluminum bracket 40 is formed with a cylindrical hole 44a, and the temperature sensor 50 is made of an aluminum case 54 (cylindrical body) that can be inserted into the cylindrical hole 44a of the aluminum bracket 40 and the aluminum. And the temperature sensitive element 51 molded in the case 54. Since the case 54 is made of aluminum, corrosion of the aluminum bracket 40 is prevented, and at the same time, the temperature sensor 50 can be easily attached and detached by the combination of the cylindrical case 54 and the cylindrical hole 44a. Since the temperature sensor 50 can be easily attached and detached, maintenance is facilitated, and an increase in cost for maintaining and managing the refrigeration apparatus can be suppressed.

(4-3)
The aluminum outdoor heat exchanger 13 includes a plurality of flat aluminum multi-hole tubes 33 (flat tubes) arranged so that side surfaces thereof face each other, and an aluminum header to which the plurality of flat multi-hole tubes 33 are connected. The collecting pipes 34 and 35 and the plurality of aluminum heat transfer fins 32 joined to the plurality of flat multi-hole pipes 33, and a plurality of refrigerants (fluids) flowing inside the plurality of flat multi-hole pipes 33 are provided. It is configured to exchange heat with air flowing outside the flat multi-hole tube 33.

  The aluminum bracket 40 has a slit 44b (opening) connected to the cylindrical hole 44a, and is attached to the header collecting pipe 35 so that the slit 44b faces the aluminum header collecting pipe 35. The temperature sensor 50 can be brought into direct contact with the aluminum header collecting pipe 35 through the slit 44b of the aluminum bracket 40. With such a structure, the temperature detection accuracy of the temperature sensor 50 can be improved, and even if the temperature sensor 50 is attached to the bracket 40, the performance of the refrigeration apparatus can be kept high.

(4-4)
When the outdoor heat exchanger 13 made of aluminum functions as a condenser, a flat multi-hole tube 33a for gas refrigerant for flowing a gas refrigerant or a gas-liquid two-layer refrigerant out of the plurality of flat multi-hole tubes 33; , A liquid refrigerant flat multi-hole tube 33b for flowing a gas-liquid two-layer refrigerant or a liquid refrigerant. The aluminum header collecting pipe 34 (first header collecting pipe) is connected to an internal space 34a (upper internal space) to which the gas refrigerant flat multi-hole pipe 33a is connected and a liquid refrigerant flat multi-hole pipe 33b. And an internal space 34b (lower internal space). On the other hand, the aluminum header collecting pipe 35 (second header collecting pipe) includes internal spaces 35a and 35b (upper internal space) to which the gas refrigerant flat multi-hole pipe 33a is connected, and liquid refrigerant flat multi-hole pipe 33b. Are connected to the internal spaces 35d and 35e (lower internal space). The internal space 35c is also an upper internal space and a lower internal space.

  When the outdoor heat exchanger 13 functions as a condenser, the refrigerant flowing from the outside into the internal space 34a of the header collecting pipe 34 is folded back once by the header collecting pipe 34, and from the internal space 34b of the header collecting pipe 34 The refrigerant is reciprocated once so as to flow to the outside.

  The aluminum bracket 40 is disposed around the inner space 35a (upper inner space) of the header collecting pipe 35 made of aluminum. The position around the inner space 35 a of the header collecting pipe 35 is advantageous for fixing the outdoor heat exchanger 13. In addition, since the gas-liquid two-layer refrigerant that is folded back once flows in the internal space 35a of the header collecting pipe 35 of the outdoor heat exchanger 13 having a refrigerant reciprocating structure, the control is performed. It is also advantageous for detecting the saturation temperature of the necessary refrigerant. As described above, when the sensor holding portion 44 is provided on the aluminum bracket 40 that can be disposed at a position around the inner space 35a of the header collecting pipe 35, the outdoor heat exchanger 13 can be securely fixed, and at the same time An improvement in the performance of the apparatus can be realized.

(5) Modification (5-1) Modification A
In the above embodiment, the case where an aluminum member is used for the outdoor heat exchanger 13 or the like has been described. However, the aluminum member can be replaced with an aluminum alloy member, for example, an aluminum outdoor heat exchanger. Instead of 13, an aluminum alloy outdoor heat exchanger can be used, and instead of the aluminum bracket 40, an aluminum alloy bracket can be used.

(5-2) Modification B
In the above embodiment, the header collecting pipe 34 is formed with one internal space 34a in the upper part and one internal space 34b in the lower part, and the heat exchanger side gas pipe 38 and the heat exchanger side liquid made of aluminum. One tube 39 is provided, but a plurality of tubes 39 may be provided. For example, you may connect with external piping using other components, such as a shunt.

(5-3) Modification C
In the above embodiment, the aluminum case 54 of the temperature sensor 50 is formed to have a circular cross-sectional outer shape, but may have other shapes, for example, an ellipse or an oval shape. The temperature sensor 50 is firmly pressed against the sensor holding portion 44 of the aluminum bracket 40 to increase the frictional resistance. For example, a screw is cut on the outer surface of the case of the temperature sensor 50 and the corresponding screw groove May be provided on the sensor holding portion 44 and screwed together, and the fixing method is not limited to the above-described method.

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 2 Air-conditioning outdoor unit 3 Air-conditioning indoor unit 13 Outdoor heat exchanger 20 Unit casing 32 Heat transfer fin 33 Flat multi-hole pipe 34, 35 Header collecting pipe 40 Bracket 50 Temperature sensor

JP 2011-69543 A

Claims (4)

A casing component (20);
A heat exchanger (13) made of aluminum or aluminum alloy disposed inside the space (S1) surrounded by the casing constituent members;
A temperature sensor (50) for detecting the temperature of the heat exchanger made of aluminum or aluminum alloy;
A fixing part (43) fixed to the casing constituent member, a fixing part (42) directly attached to the heat exchanger made of aluminum or aluminum alloy, and a holding part (44) for holding the temperature sensor. An aluminum or aluminum alloy bracket (40) having;
A refrigeration apparatus comprising: The bracket is formed with a cylindrical hole (44a),
The temperature sensor has an aluminum or aluminum alloy cylinder that can be inserted into the cylindrical hole of the bracket made of aluminum or aluminum alloy, and a temperature sensing element molded in the cylinder.
The refrigeration apparatus according to claim 1. The heat exchanger made of aluminum or aluminum alloy is made of aluminum or a plurality of flat tubes (33) made of aluminum or aluminum alloy arranged so that the side surfaces face each other, and aluminum or a plurality of the flat tubes connected to each other. It has an aluminum alloy header collecting pipe (34, 35) and a plurality of aluminum or aluminum alloy fins (32) joined to the plurality of flat pipes, and flows inside the plurality of flat pipes. The fluid is configured to exchange heat with air flowing outside the plurality of flat tubes,
The bracket made of aluminum or aluminum alloy has an opening (44b) connected to the cylindrical hole, and the header collecting pipe is formed so that the opening faces the header collecting pipe made of aluminum or aluminum alloy. It is attached,
The refrigeration apparatus according to claim 2. When the header collecting pipe made of aluminum or aluminum alloy functions as a condenser, a flat pipe for gas refrigerant (33a) for flowing a gas refrigerant or a gas-liquid two-layer refrigerant out of the plurality of flat pipes Are connected to each other and a lower internal space to which a liquid refrigerant flat tube (33b) for flowing a gas-liquid two-layer refrigerant or a liquid refrigerant among the plurality of flat tubes is connected. Alternatively, the first header collecting pipe (34) made of aluminum alloy and the second header collecting pipe (35) made of aluminum or aluminum alloy, the first header collecting pipe from the upper internal space (34a) to the first header collecting pipe (34). The refrigerant flowing in the lower internal space (34b) of the header collecting pipe is folded back once by the second header collecting pipe, and the refrigerant is reciprocated once.
The bracket made of aluminum or aluminum alloy is disposed around the upper internal space (35a, 35b) of the second header collecting pipe made of aluminum or aluminum alloy.
The refrigeration apparatus according to claim 3.

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