JP4845987B2 - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify piping, to facilitate operation control, and to improve operation efficiency. <P>SOLUTION: This air conditioning system includes: a refrigerant inflow pipe 31 connected to a refrigerant inflow port 18a formed in an upwind side heat exchanger 11; a refrigerant outflow pipe 32 connected to a refrigerant outflow port 18b; an expansion mechanism such as an expansion valve EV interposed in the refrigerant outflow pipe; branch pipes 33, 34 connecting the refrigerant inflow pipe to the refrigerant outflow pipe and arranged in parallel with each other; two check valves CV1, CV2 (CV3, CV4) interposed in each of the branch pipes in series, inhibiting a flow from the refrigerant inflow port side to the refrigerant outflow port side and inhibiting a flow when the pressure of the secondary side of a refrigerant made to flow in the pipe is higher than that of the primary side; an outdoor side pipe 35 for connecting a portion between the two check valves of the first branch pipe to a refrigerant inflow/outflow port at a lower end of a downwind side heat exchanger 12; and an indoor side pipe 36 for connecting a portion between the two check valves of the second branch pipe to an indoor side heat exchanger 6. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a heating and cooling air conditioning system characterized by a heat exchanger for the outdoor unit.

  In general, in an outdoor unit heat exchanger of an air conditioning / air conditioning system, when the temperature of the outside air decreases during heating operation, frost adheres to the outdoor unit heat exchanger, reducing the ventilation rate and the heat exchange rate. It was necessary to defrost to make it come. Therefore, the windward side heat exchanger and the leeward side heat exchanger arranged in parallel on the windward side and the leeward side with respect to the outdoor air passage are used as outdoor unit heat exchangers, and during heating, the high-temperature refrigerant is used as the windward side heat exchanger. A cooling and heating air conditioning system is known in which the refrigerant having a low temperature due to adiabatic expansion flows to the leeward heat exchanger and the high temperature refrigerant flows in the order of the leeward heat exchanger and then the windward heat exchanger during cooling. (For example, refer to Patent Document 1).

  As shown in FIG. 6, the air conditioning and air conditioning system described in Patent Document 1 includes a compressor 5, an indoor unit heat exchanger 6, an outdoor unit heat exchanger 10, and first and second electronic expansions. And valves EV1 and EV2. The outdoor unit heat exchanger 10 includes a windward heat exchanger 11 disposed on the windward side of the outdoor air passage 7 and a leeward heat exchanger 12 disposed on the leeward side. . A blower fan 13 for taking in outside air A is disposed on the windward side of the windward heat exchanger 11.

  Moreover, the 1st piping 21 which connects the compressor 5 and the indoor unit heat exchanger 6, and the 2nd piping which connects the compressor 5 and the leeward side heat exchanger 12 of the heat exchanger 10 for outdoor units. 22 is provided with a four-way valve DV which is a switching valve. By switching the four-way valve DV, the high-temperature and high-pressure refrigerant discharged from the compressor 5 flows to the indoor unit heat exchanger 6 or the leeward heat exchanger 12. The third pipe 23 that connects the indoor unit heat exchanger 6 and the windward heat exchanger 11 includes a first check valve CVa and a first electronic expansion valve EV1 that functions only during cooling. It is installed. The fourth pipe 24 connecting the windward side heat exchanger 11 and the leeward side heat exchanger 12 is provided with a second check valve CVb and a second electronic expansion valve EV2 that functions only during heating. Has been.

JP 2008-25897 A (Claims, FIGS. 1 and 2)

  However, in the air conditioning air conditioning system described in Patent Document 1, since it is necessary to provide two electronic expansion valves in one air conditioning air conditioning system, the piping becomes complicated and the control of the electronic expansion valve becomes complicated, In addition, there are concerns such as increased costs.

  Further, in the air conditioning and air conditioning system described in Patent Document 1, with respect to the windward side heat exchanger in which the refrigerant (internal fluid) flowing inside is always in a liquid phase state having a large flow path resistance, the cooling and heating operations are performed. Since the refrigerant inflow direction is changed, there is a problem that the operation efficiency is lowered.

The present invention has been made in view of the above circumstances, and simplifying the piping can be reduced, to facilitate the operation control, and an object thereof to provide an HVAC system which is adapted can be improved operating efficiency .

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the windward side heat exchanger and the leeward side heat exchanger that are arranged in parallel on the windward side and the leeward side with respect to the outdoor air passage are used as outdoor unit heat exchangers. Used when heating, high-temperature refrigerant flows to the windward heat exchanger, then the refrigerant that has become low temperature due to adiabatic expansion flows to the leeward heat exchanger, and during cooling, the high-temperature refrigerant flows to the leeward heat exchanger and windward heat exchange. In a cooling / heating air conditioning system configured to flow in the order of the cooler, a refrigerant inlet pipe connected to a refrigerant inlet provided at an upper end of the windward heat exchanger and a refrigerant outlet provided at a lower end of the windward heat exchanger A refrigerant outlet pipe connected to the refrigerant outlet pipe, an expansion mechanism interposed in the refrigerant outlet pipe, the first and second branch pipes in parallel connecting the refrigerant inlet pipe and the refrigerant outlet pipe, and the first and second The refrigerant flow is interposed in series with each of the second branch pipes. Two check valves for blocking the flow from the inlet side to the refrigerant outlet side and blocking the flow when the secondary side is at a high pressure relative to the primary side of the refrigerant flowing in the pipe, and the two check valves in the first branch pipe The outdoor heat exchanger connecting between the check valves and the refrigerant outflow inlet at the lower end of the leeward heat exchanger and the two heat check valves in the second branch pipe are connected to the indoor heat exchanger. An indoor side pipe, and the windward side heat exchanger and the leeward side heat exchanger are respectively provided with a pair of header pipes provided with the refrigerant inlet and the refrigerant outlet, and the pair of header pipes. A parallel flow type heat exchanger composed of a plurality of parallel flat heat exchange tubes communicating with each other and corrugated fins interposed between the adjacent flat heat exchange tubes, and facing each other Oppositely arranged vertically, In any of the operation and in heating operation tufts operation also, the refrigerant in the windward heat exchanger, characterized in Rukoto that have a structure that flows from the top to the bottom of the weight direction. Here, the expansion mechanism can be formed by, for example, an expansion valve or a capillary tube utilizing capillary action.

  By comprising in this way, by the control of one expansion mechanism and the non-return valve mechanism which consists of a plurality (4) of non-return valves, it is possible to connect to the windward side heat exchanger in both the cooling operation and the heating operation. The inflow direction of the refrigerant can be made constant.

  In this invention, it is preferable to provide the refrigerant inlet at the upper end of the upwind heat exchanger and to provide the refrigerant outlet at the lower end of the upwind heat exchanger.

  By comprising in this way, the flow of the refrigerant | coolant to an upwind heat exchanger can be flowed to a gravitational direction (from top to bottom), and the passage resistance value of an upwind heat exchanger can be suppressed to the minimum. .

  According to this invention, since it is configured as described above, the following excellent effects can be obtained.

(1) According to the first aspect of the present invention, the condensed high-temperature refrigerant is caused to flow to the windward heat exchanger in both the cooling operation and the heating operation by the control of one expansion mechanism and the check valve mechanism. Therefore, the expansion mechanism can be simplified, operation control can be facilitated, and operation efficiency can be improved.

  (2) According to the invention described in claim 2, the flow of the refrigerant to the windward heat exchanger can be caused to flow in the direction of gravity (from top to bottom), and the passage resistance value of the windward heat exchanger is minimized. Since it can suppress, in addition to said (1), the improvement of driving | operation efficiency can be aimed at further.

It is a schematic block diagram which shows the state at the time of air_conditionaing | cooling driving | operation of the heat exchanger for outdoor units of the air conditioning system which concerns on this invention. It is a schematic block diagram which shows the state at the time of the heating operation of the heat exchanger for outdoor units. It is sectional drawing which shows the state at the time of the cooling operation of the non-return valve in this invention. It is sectional drawing which shows the state at the time of heating operation of the non-return valve in this invention. It is a schematic block diagram which expand | deploys and shows the windward side heat exchanger and leeward side heat exchanger in this invention. It is a schematic block diagram which shows the heat exchanger for outdoor units of the conventional air-conditioning / air conditioning system.

  Hereinafter, an embodiment of a heat exchanger for an outdoor unit of an air conditioning system according to the present invention will be described in detail with reference to the accompanying drawings. Here, the same parts as those of the conventional outdoor unit heat exchange device will be described with the same reference numerals.

  The air-conditioning / air-conditioning system includes an outdoor unit heat exchanger 10 including an upwind heat exchanger 11 and a leeward heat exchanger 12 arranged in parallel on the upwind side and the downwind side with respect to an outdoor air passage, and an upwind heat exchanger. 11, a refrigerant inflow pipe 31 connected to the refrigerant inlet 18 a provided at the upper end of the heat exchanger 11, a refrigerant outlet pipe 32 connected to the refrigerant outlet 18 b provided at the lower end of the windward heat exchanger 11, and the refrigerant outlet pipe 32. An expansion mechanism, for example, an expansion valve EV, a first branch pipe 33 and a second branch pipe 34 connected in parallel to each other, connecting the refrigerant inflow pipe 31 and the refrigerant outflow pipe 32, and the first and second A check valve mechanism 40, which will be described later, consisting of a total of four check valves CV1, CV2, CV3, CV4 interposed in the branch pipes 33, 34, and two check valves CV1, CV2 in the first branch pipe 33 And the refrigerant outlet 1 at the lower end of the leeward heat exchanger 12 The outdoor side pipe 35 for connecting d, the space between the two check valves CV3 and CV4 in the second branch pipe 34, and the indoor unit heat exchanger 6 (hereinafter referred to as the indoor side heat exchanger 6) are connected. A first indoor pipe 36.

  The second indoor pipe 37 connecting the leeward heat exchanger 12 and the indoor heat exchanger 6 is provided with a four-way valve DV and a compressor 5 in order from the leeward heat exchanger 12 side. The high-temperature and high-pressure refrigerant discharged from the compressor 5 flows through the indoor unit heat exchanger 6 or the leeward heat exchanger 12 of the outdoor unit heat exchanger 10 by switching the four-way valve DV. It has become.

  As shown in FIGS. 1 to 4, the check valve mechanism 40 includes a first branch pipe 33 and a second branch pipe 34 that are connected in parallel to each other and connect the refrigerant inflow pipe 31 and the refrigerant outflow pipe 32. In other words, the first check valve CV1 and the second check valve CV2 that are interposed in series with the first branch pipe 33 and the other branch pipe, that is, the second branch pipe 34, are connected in series. The third check valve CV3 and the fourth check valve CV4 are four check valves. In this case, the check valves CV1 to CV4 block the flow from the refrigerant inlet 18a side to the refrigerant outlet 18b side and to the primary side of the refrigerant flowing in the first and second branch pipes 33 and 34. On the other hand, the secondary side has a function of blocking the flow when the pressure is high.

  In the check valve mechanism 40 formed as described above, refrigerant flows out of the first branch pipe 33 between the first check valve CV1 and the second check valve CV2 and at the lower end of the leeward heat exchanger 12. The inlet 18d is connected to the outdoor pipe 35. Further, the third check valve CV3 and the fourth check valve CV4 in the second branch pipe 34 and the indoor heat exchanger 6 are connected by the first indoor pipe 36.

  Both the windward side heat exchanger 11 and the leeward side heat exchanger 12 constituting the outdoor unit heat exchanger 10 are formed of aluminum alloy parallel flow type heat exchangers. That is, as shown in FIG. 5, the windward side heat exchanger 11 and the leeward side heat exchanger 12 communicate with a pair of header pipes 14 and 15 made of aluminum alloy facing each other and the header pipes 14 and 15. The plurality of flat heat exchange pipes 16 made of, for example, extruded shapes made of parallel aluminum alloys, and corrugated fins 17 made of aluminum alloy interposed between adjacent flat heat exchange pipes 16 are mainly configured. Yes.

  In this case, the upper header pipe 14 of the windward side heat exchanger 11 is provided with a refrigerant inlet 18a to which the refrigerant inflow pipe 31 is connected, and the lower header pipe 15 of the windward side heat exchanger 11 is provided with a refrigerant outlet pipe. The refrigerant | coolant outflow port 18b to which 32 is connected is provided. On the other hand, the upper header pipe 14 of the leeward heat exchanger 12 is provided with a refrigerant inflow / outlet port 18c to which the first indoor pipe 36 is connected, and the lower header pipe 15 of the leeward heat exchanger 12 has a first header pipe 15c. A refrigerant inlet / outlet port 18d to which the two indoor pipes 37 are connected is provided. The flat heat exchange pipe 16 has a plurality of refrigerant passages (not shown) defined therein. Further, the upper and lower header pipes 14 and 15, the flat heat exchange pipe 16 and the corrugated fins 17 are integrally formed by brazing, for example.

As described above, by forming the windward side heat exchanger 11 and the leeward side heat exchanger 12 with a parallel flow type heat exchanger, a plurality of meandering heat transfer tubes are penetrated through the heat transfer fins. Since the thickness can be reduced as compared with the And-tube type heat exchanger, the installation space of the outdoor unit heat exchanger 10 can be saved, that is, the outdoor unit heat exchanger 10, the expansion valve EV and the reverse. Space saving of the outdoor unit 50 that accommodates the valve stop mechanism 40 and the like can be achieved. In FIG. 5, reference numeral 60 is an indoor unit that houses the indoor heat exchanger 6. In addition, when comparing parallel flow type heat exchangers and fin-and-tube heat exchangers with the same ventilation area and heat exchange performance, parallel flow type heat exchangers are fin-and-tube type heat exchangers. In contrast, the pressure loss of the outside air can be reduced, and the pressure loss of the refrigerant can be reduced.

  In addition, although the said embodiment demonstrated the case where an expansion mechanism was formed with the expansion valve EV, it may replace with the expansion valve EV and may form an expansion mechanism with the capillary tube using a capillary phenomenon.

  Moreover, in the said embodiment, although the windward side heat exchanger 11 and the leeward side heat exchanger 12 were made into the parallel flow type heat exchanger made from the aluminum alloy which has the header pipes 14 and 15 facing up and down, The windward side heat exchanger 11 may be an aluminum alloy parallel flow heat exchanger having header pipes facing left and right.

  Moreover, although the said embodiment demonstrated the case where the magnitude | size of the leeward side heat exchanger 11 and the leeward side heat exchanger 12 was made the same, the height and area of the leeward side heat exchanger 11 are made into leeward side heat exchange. The pressure loss can be further reduced to 1/4 to 2/3 of the vessel 12.

  Next, the operation of the air conditioning and air conditioning system using the outdoor unit heat exchanger 10 according to the present invention will be described with reference to FIGS.

<During cooling operation>
During the cooling operation, as indicated by arrows in FIGS. 1 and 3, the refrigerant that has passed through the expansion valve EV (expansion mechanism) and has been reduced in pressure by adiabatic expansion is supplied to the fourth check valve CV4 of the check valve mechanism 40. It passes through and flows into the indoor heat exchanger 6 and is evaporated. At this time, the second check valve CV2 and the third check valve CV3 do not function as flow paths because the valve back is filled with high-pressure refrigerant (see FIG. 3).

  The refrigerant that has passed through the indoor heat exchanger 6 passes through the four-way valve DV → the compressor 5 → the leeward heat exchanger 12, and the first check valve in the first branch pipe 33 via the outdoor pipe 35. It flows between CV1 and the second check valve CV2. The refrigerant that has returned to the check valve mechanism 40 passes through the first check valve CV1. At this time, the second check valve CV2 and the third check valve CV3 do not function as flow paths because of the valve check function (see FIG. 3).

  The refrigerant that has passed through the first check valve CV1, that is, the high-temperature condensate, flows in the direction of gravity (from top to bottom) from the refrigerant inlet 18a at the upper end of the windward heat exchanger 11. Thereby, while the windward side heat exchanger 11 functions as a subcooler and the passage resistance value of the windward side heat exchanger 11 can be suppressed to the minimum, the operating efficiency can be improved.

<During heating operation>
During the heating operation, as indicated by an arrow in FIG. 2, the refrigerant that has passed through the expansion valve EV (expansion mechanism) and has been reduced in pressure by adiabatic expansion passes through the second check valve CV <b> 2 of the check valve mechanism 40, It flows to the leeward heat exchanger 12 and is evaporated. At this time, the first check valve CV1 and the fourth check valve CV4 do not function as flow paths because the valve back is filled with high-pressure refrigerant (see FIG. 4).

  The refrigerant that has passed through the leeward heat exchanger 12 passes through the four-way valve DV → the compressor 5 → the indoor heat exchanger 6 and passes through the first indoor pipe 36 and the third branch pipe 34 through the third branch pipe 34. It flows between the check valve CV3 and the fourth check valve CV4. The refrigerant that has returned to the check valve mechanism 40 passes through the third check valve CV3. At this time, the first check valve CV1 and the fourth check valve CV4 do not function as flow paths because of the valve check function (see FIG. 4).

  The refrigerant that has passed through the third check valve CV3, that is, the high-temperature condensate, flows in the direction of gravity (from top to bottom) from the refrigerant inlet 18a at the upper end of the windward heat exchanger 11. Thereby, since the passage resistance value of the windward heat exchanger 11 can be suppressed to the minimum, the operation efficiency can be improved.

  As described above, according to the heat exchange device for an outdoor unit according to the present invention, the air flow is controlled in both the cooling operation and the heating operation by controlling one expansion valve EV (expansion mechanism) and the check valve mechanism 40. Since the inflow direction of the refrigerant to the upper heat exchanger 11 can be made constant, piping can be simplified, operation control can be facilitated, and operation efficiency can be improved.

5 Compressor 6 Indoor Heat Exchanger 10 Outdoor Heat Exchanger 11 Upward Heat Exchanger 12 Downward Heat Exchanger 18a Refrigerant Inlet 18b Refrigerant Outlet 31 Refrigerant Inlet Pipe 32 Refrigerant Outlet Pipe 33 First Branch Pipe 34 Second branch pipe 35 Outdoor side pipe 36 First indoor side pipe 37 Second indoor side pipe 40 Check valve mechanism EV Expansion valve (expansion mechanism)
CV1 to CV4 first to fourth check valves

Claims (1)

The windward side heat exchanger and the leeward side heat exchanger that are installed side by side on the windward side and the leeward side with respect to the outdoor air passage are used as heat exchangers for the outdoor unit. During heating, high-temperature refrigerant flows to the windward side heat exchanger. After that, the refrigerant that has become low temperature due to adiabatic expansion flows to the leeward side heat exchanger, and at the time of cooling, the high temperature refrigerant flows in the order of the leeward side heat exchanger, then the windward side heat exchanger,
A refrigerant inlet pipe connected to a refrigerant inlet provided at the upper end of the upwind heat exchanger;
A refrigerant outlet pipe connected to a refrigerant outlet provided at the lower end of the upwind heat exchanger;
An expansion mechanism interposed in the refrigerant outflow pipe;
A first branch pipe and a second branch pipe which are parallel to each other and connect the refrigerant inlet pipe and the refrigerant outlet pipe;
Each of the first and second branch pipes is connected in series to block the flow from the refrigerant inlet side to the refrigerant outlet side, and when the secondary side is at a high pressure relative to the primary side of the refrigerant flowing in the pipe. Two check valves to block the flow;
An outdoor pipe connecting the two check valves in the first branch pipe and a refrigerant outlet at the lower end of the leeward heat exchanger;
An indoor pipe connecting between the two check valves in the second branch pipe and the indoor heat exchanger ;
The windward side heat exchanger and the leeward side heat exchanger include a pair of header pipes provided with the refrigerant inlet and the refrigerant outlet, respectively, and a plurality of parallel flat heats communicating with the pair of header pipes. It consists of a single parallel flow type heat exchanger composed of an exchange pipe and a corrugated fin interposed between the adjacent flat heat exchange pipes, and is arranged vertically in parallel facing each other. And
In any time and in the heating operation cooling operation, Rukoto that have a structure that flows down the refrigerant in the windward heat exchanger from the top of the weight direction,
Heating and cooling air conditioning system according to claim.

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