JP2007032964A - Multi-type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a foreign matter is remained in other line of refrigerant circuit, when a method of diverting an existing pipe to the refrigerant circuit of an indoor unit of 1:1 correspondence to replace a new refrigerant is applied to the refrigerant circuit having a plurality of indoor units, in a conventional multi-type air conditioner. <P>SOLUTION: In this multi-type air conditioner comprising the plurality of indoor units constituting the multi-type refrigerant circuit and a single outdoor heat exchanger, a chloride recovery circuit is formed, a chloride recovery means having an activated carbon filter is provided in the circuit, chloride recovery operation and cleaning buttons are provided in an outdoor control substrate, and a refrigerant flows in all piping lines, when the chloride recovery operation button is turned on, to carry out a chloride recovery operation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multi-type separation-type air conditioner having a plurality of indoor units and outdoor units, when replacing an air conditioner that uses a fluorocarbon hydrogen-based refrigerant not containing chlorine as a refrigerant. The present invention relates to a multi-type air conditioner that enables reuse of a refrigerant pipe for connection.

  In the case where the indoor unit and the outdoor unit are connected at a ratio of 1: 1 in the air conditioner in which the indoor unit and the outdoor unit are separated, chloride recovery means such as activated carbon is used in the refrigerant circuit. A filter is installed, and the refrigerant is operated to flow through the filter during chloride recovery operation, etc. during a preset required time. The damage to the compressor is avoided.

However, in the system of a plurality of indoor units and one outdoor unit, so-called multi-type air conditioner, for example, when only one of the plurality of indoor units is operated, other than the piping system of the operating indoor unit In this case, the refrigerant does not flow in the pipe, so that foreign matters in the pipes of other systems remain in the pipes. Since the chloride in the piping of the indoor unit system that started operation after the required time set in advance has not been removed, there have been problems such as occurrence of problems such as clogging due to foreign matter. (For example, see Patent Document 1)
JP-A-2002-250576 (pages 4 to 5, FIGS. 1 and 2)

  The conventional multi-type air conditioner has many components and is difficult to store in one outdoor unit when using existing piping in the refrigerant circuit of multiple indoor units and one outdoor unit. Met.

  This invention is an inexpensive and less troublesome method that is implemented with one indoor unit and one outdoor unit, and even in a system of a plurality of indoor units and a single outdoor unit, it can recover chloride in piping. The purpose is to ensure that the refrigerant circuit is clogged by foreign matter and the reliability of the compressor can be ensured even when the existing piping is diverted.

  The multi-type air conditioner of the present invention includes a compressor, an oil separator that separates refrigeration oil in a gas refrigerant, a four-way switching valve, an outdoor heat exchanger, a liquid pipe, and a first electronic expansion valve that is a plurality of decompression devices, A second electronic expansion valve, a plurality of indoor heat exchangers, a first indoor heat exchanger, a second indoor heat exchanger, a gas pipe, an accumulator for storing excess refrigerant, and oil separated from the gas refrigerant by the oil separator 2 A plurality of indoor heat exchangers and a single outdoor heat exchanger, each of which includes a first capillary for returning the air to the compressor suction side, and is connected in communication with the refrigerant pipe to form a multi-type refrigerant circuit In this multi-type air conditioner, a chloride recovery circuit is formed, a chloride recovery means having an activated carbon filter is provided in the circuit, and a chloride recovery operation button is provided on the outdoor unit control board. All when the driving button is turned on Refrigerant flows into the piping system, it is to implement a chloride recovery operation.

  The multi-type air conditioner of the present invention includes a compressor, an oil separator that separates refrigeration oil in a gas refrigerant, a four-way switching valve, an outdoor heat exchanger, a liquid pipe, and a first electronic expansion valve that is a plurality of decompression devices, A second electronic expansion valve, a plurality of indoor heat exchangers, a first indoor heat exchanger, a second indoor heat exchanger, a gas pipe, an accumulator for storing excess refrigerant, and oil separated from the gas refrigerant by the oil separator 2 A plurality of indoor heat exchangers and a single outdoor heat exchanger, each of which includes a first capillary for returning the air to the compressor suction side, and is connected in communication with the refrigerant pipe to form a multi-type refrigerant circuit In this multi-type air conditioner, a chloride recovery circuit is formed, a chloride recovery means having an activated carbon filter is provided in the circuit, and a chloride recovery operation button is provided on the outdoor unit control board. Chloride when the operation button is turned on When the recovery operation is performed and the refrigerant flows through all the refrigerant circuits including the plurality of indoor heat exchangers and the single outdoor heat exchanger, for example, when only one of the indoor units is operated However, the foreign matter in the pipes of other systems can be collected without remaining in the pipe, and there is an effect that troubles such as clogging due to the foreign matters are eliminated.

Embodiment 1 FIG.
1 is a refrigerant circuit diagram showing a multi-type air conditioner according to Embodiment 1 of the present invention. In FIG. 1, a compressor 1, an oil separator 2 for separating refrigeration oil in a gas refrigerant, a four-way switching valve 3, an outdoor heat exchanger 4, a liquid pipe 5, and a first electronic expansion valve 6a that is a plurality of decompression devices, Gas is generated in the second electronic expansion valve 6b, the first indoor heat exchanger 7a, which is a plurality of indoor heat exchangers, the second indoor heat exchanger 7b, the gas pipe 8, the accumulator 9 for storing excess refrigerant, and the oil separator 2. A first capillary 2a for returning the oil separated from the refrigerant to the compressor suction side 1a is provided, and these are connected in communication by a refrigerant pipe 10 to constitute a multi-type refrigerant circuit. A liquid blocking valve 11 is provided on the liquid side of the refrigerant circuit, and a gas blocking valve 12 is provided on the gas side.

  Next, the chloride recovery circuit will be described. The chloride recovery circuit 13 includes a solenoid valve 13a, a second capillary 13b for flow rate adjustment, and a chloride recovery means 14, and one end of the chloride recovery circuit 13 is connected in parallel to the first capillary 2a. The accumulator 9 outlet side pipe and the compressor suction pipe 1a side pipe in the multi-type refrigerant circuit are connected, and the other end communicates between the oil separator 2 side pipe and the first capillary tube 2a side pipe. Connected and configured.

  Next, a detailed configuration of the chloride recovery means 14 shown in FIG. 2 will be described. FIG. 2 is a cross-sectional view of the main part showing the chloride recovery means. In the figure, a muffler 14 serving as a chloride recovery means is connected to the refrigerant pipe 10 to allow a refrigerant to flow in, a refrigerant inlet part 14a and a refrigerant outlet part 14b from which the refrigerant flows out, and a diameter larger than the pipe diameter of the refrigerant inlet / outlet part. The main body part 14c is formed, and the activated carbon filter 14d is built in the main body part. The activated carbon filter 14d is fixedly supported by a plurality of large caulking 14e so as to sandwich the front and rear at the central position of the main body part 14c. . A strainer 14f is fixedly supported by a small caulking 14g near the refrigerant outlet 14b side of the muffler 14.

  A pressure sensor 15 for detecting the pressure saturation temperature is provided between the oil separator 2 and the four-way switching valve 3. The first two-phase pipe temperature sensor 16 is provided in the outdoor heat exchanger 4 pipe so as to detect the two-phase pipe temperature of the outdoor heat exchanger 4, and detects the refrigerant temperature liquefied by the outdoor heat exchanger. A one-liquid pipe temperature sensor 17 is provided in the vicinity of the heat exchanger 4 outlet pipe. The second two-phase pipe temperature sensor 18a and the third two-phase pipe temperature sensor 18b are provided in the first indoor heat exchanger 7a pipe and the second indoor heat exchanger 7b pipe, and the first indoor heat exchanger 7a and the second indoor heat exchanger 7b are provided. It is provided in the vicinity of the inlet pipe of the heat exchanger 7b.

  FIG. 3 is a control block diagram of chloride recovery operation, where (a) is a block diagram in which a chloride recovery operation button is provided on the outdoor side, and (b) is a block diagram in which a chloride recovery operation button is provided on the remote control side. It is. The outdoor unit control board 20 is electrically connected to a first indoor unit control board 21a and a second indoor unit control board 21b each having a first remote controller 22a and a second remote controller 22b. The chloride recovery operation button 23 may be provided on any one of the outdoor unit control board 20, the first remote controller 22a, and the second remote controller 22b.

  Next, the refrigerant flow during normal operation of the multi-type air conditioner according to Embodiment 1 of the present invention will be described. In FIG. 4, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 enters the four-way switching valve 3 after the refrigeration oil in the gas refrigerant is separated by the oil separator 2.

  During the cooling operation, as shown by a solid line, after entering the outdoor heat exchanger 4 that functions as a condenser from the four-way switching valve 3 and being cooled and condensed and liquefied, the first electronic expansion valve in the indoor unit that is being operated via the liquid pipe 5 6a reaches the second electronic expansion valve 6b. After being depressurized and wetted by the first electronic expansion valve 6a and the second expansion valve 6b, they enter the first indoor heat exchanger 7a and the second indoor heat exchanger 7b, which function as evaporators, and are heated and evaporated. It passes through the switching valve 3, passes through an accumulator 9 that stores excess refrigerant, and returns to the compressor 1. The refrigerating machine oil separated by the oil separator 2 returns to the compressor 1 through the first capillary 2a and the compressor suction pipe 1a.

  Further, during the heating operation, the four-way switching valve 3 causes the refrigerant flow to be opposite to that during cooling as indicated by the broken line. After entering the indoor heat exchangers 7a and 7b acting as condensers from the four-way switching valve 3 and being cooled to condensate liquid, they reach the first electronic expansion valve 6a and the second electronic expansion valve 6b. After being depressurized and wetted by the first electronic expansion valve 6a and the second electronic expansion valve 6b, the refrigerant enters the outdoor heat exchanger 4 that functions as an evaporator, is heated and evaporated, and then passes through the four-way switching valve 3 to store excess refrigerant. Through the accumulator 9 to return to the compressor 1. The refrigerating machine oil separated by the oil separator 2 passes through the first capillary 2a and returns to the suction pipe 1a side of the compressor 1.

  For example, when a plurality of indoor units are operated in the cooling operation, as shown in FIG. 4, the refrigerant flows through the pipes of both the two indoor heat exchangers, but only one of the indoor units is operated. 5, the second electronic expansion valve 6b of the other indoor unit is closed or slightly opened, and the second electronic expansion valve 6b side pipe 6c, the second indoor heat exchanger 7b, and the second indoor heat exchange are The refrigerant does not flow in the pipe 7c side pipe 7c.

  Similarly, in the case of heating operation, when a plurality of indoor units are in operation, the refrigerant flows through the piping of both the indoor units as shown in FIG. 4, but when only one of the indoor units is operated, 5, the second electronic expansion valve 6b of the other indoor unit is closed or slightly opened, the pipe 7c on the second indoor heat exchanger 7b side, the second indoor heat exchanger 7b, and the second electronic expansion valve. No refrigerant flows in the 6b side pipe 6c, or only a small amount flows.

  For this reason, in both the cooling operation and the heating operation, a refrigerant pool is generated in the refrigerant circuit that is stopped, and chloride contained in the refrigerant is also accumulated.

  Further, in order to maintain the performance, the first electronic expansion valve 6a and the second electronic expansion valve 6b, which are pressure reducing devices, perform opening control so that the subcool of the condenser becomes a predetermined set value. The subcool detection method includes the first two-phase pipe temperature sensor 16 and the first liquid pipe temperature sensor 17 attached to the outdoor heat exchanger 4 during the cooling operation, or the pressure saturation temperature of the pressure sensor 15 and the first liquid pipe. The subcool is detected using the temperature sensor 17. During heating operation, the second two-phase pipe temperature sensor 18a, the third two-phase pipe temperature sensor 18b, the second liquid pipe temperature sensor 19a, and the second liquid pipe temperature sensor 19a attached to the first indoor heat exchanger 7a and the second heat exchanger 7b are used. Subcool detection is performed using the three liquid pipe temperature sensor 19b or the pressure saturation temperature of the pressure sensor 15 and the second liquid pipe temperature sensor 19a and the third liquid pipe temperature sensor 19b.

  Next, the operation during the chloride recovery operation will be described. In the chloride recovery operation, the recovery operation is performed for a predetermined time at the start of operation after the new refrigerant air conditioner is installed.

  First, as shown in FIG. 6, during the cooling operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 reaches the oil separator 2, where the refrigeration oil is separated. The gas refrigerant then flows to the four-way switching valve 3, but the separated refrigerating machine oil returns to the suction pipe 1 a side of the compressor 1 through the first capillary 2 a. At that time, by fully opening the solenoid valve 13a of the chloride recovery circuit 13, a part of the refrigerating machine oil returns to the suction pipe 1a side of the compressor 1 through the second capillary 13b, the chloride recovery means 14, and so on. It becomes possible to adsorb and remove the chloride compound contained in the refrigerating machine oil.

  In the muffler 14 as the chloride recovery means, the refrigerating machine oil separated by the oil separator 2 flows from the refrigerant inlet 14a as shown by the arrow and passes through the activated carbon filter 14d in the main body part. The refrigerant flows out from the refrigerant outlet portion 14b of the muffler 14 to the compressor suction pipe 1a side in the refrigerant circuit through the strainer 14f. At this time, the activated carbon filter 14d and the strainer 14f adsorb chloride compounds. To be removed.

  The same operation is performed during heating, and the chloride compound contained in the refrigeration oil can be recovered.

  The installation place of the chloride recovery means 14 is installed in an oil return circuit in which the oil separator 2 through which a large amount of refrigerating machine oil flows and the suction pipe 1a of the compressor 1 communicate with each other, which is experimentally high in recovery efficiency. Accordingly, the oil separator 2 uses a high separation efficiency, for example, a centrifugal separator, and the size of the capillary tube is set by the amount of refrigerating machine oil flowing through the first capillary tube 2a and the second capillary tube 13b being the second. The inner diameter and the length of each capillary are set so that the flow rate of the refrigerating machine oil in the capillary tube 13b> the flow rate of the refrigerating machine oil in the first capillary tube 2a. By doing so, the chloride compound can be efficiently recovered in a short time.

  In addition, during the chloride recovery operation, the first electronic expansion valve 6a and the second electronic expansion valve 6b perform the opening degree control by the subcooling of the condenser in the same manner as during the normal operation. Thus, it is possible to perform substantially the same operation as that during normal operation.

  According to Embodiment 1 described above, one of the chloride recovery means 14 is connected to the oil separator 2 installed between the compressor 1 and the four-way switching valve 3, and the other is connected to the suction pipe 1a of the compressor 1. It is provided via the electromagnetic valve 13b, and the chloride recovery operation is performed at the start of operation after the new refrigerant air conditioner is installed.

  However, as described above, when there is a stopped indoor unit, the chloride recovery operation cannot be performed for the system, so that the chloride recovery operation can be performed for all the piping systems, for example, FIG. As shown in FIG. 6, the recovery operation is instructed to all indoor units by using a dedicated chloride recovery operation button 23 provided on the control board 20 of the outdoor unit. On the other hand, the chloride recovery operation is performed, and the reliability of the compressor 1 can be ensured.

  If there is a chloride recovery operation button 23 on the outdoor unit control board 20 side, a recovery operation signal is transmitted from the outdoor unit control board 20 to each indoor unit via the indoor unit control board 21 when turned on during chloride recovery operation. And enters recovery operation.

 Further, the chloride recovery operation button 23 is provided not on the outdoor unit control board 20 but on the first remote controller 22a or the second remote controller 22b, for example, so that the same chloride recovery operation is performed on all the indoor units. Also good.

  When the chloride recovery operation button 23 is provided on the remote controller 22 side, when the chloride recovery operation button 23 is turned on, the outdoor unit control board 20 once receives a chloride recovery operation signal from the remote controller 22 and then each indoor unit. The indoor unit control board 21 transmits a chloride recovery operation signal, and each indoor unit enters the chloride recovery operation.

  As a result, when the chloride recovery operation button 23 is provided on the remote controller 22 side, the user can easily perform the chloride recovery operation, and the operation after the new refrigerant air conditioner is installed. At the start, the recovery operation is performed efficiently.

1 is a refrigerant circuit diagram of a multi-type air conditioner according to Embodiment 1 of the present invention. It is principal part sectional drawing which shows the chloride recovery means of the multi type air conditioning apparatus by Embodiment 1 of this invention. It is a control block diagram of the chloride recovery operation of the multi-type air conditioner according to Embodiment 1 of the present invention. It is explanatory drawing which shows a refrigerant | coolant flow path when the two indoor units of the multi-type air conditioning apparatus by Embodiment 1 of this invention drive | operate. It is explanatory drawing which shows a refrigerant | coolant flow path when one indoor unit of the multi-type air conditioning apparatus by Embodiment 1 of this invention is drive | operated. It is explanatory drawing which shows the refrigerant | coolant flow path at the time of the chloride recovery operation | movement of the multi type air conditioning apparatus by Embodiment 1 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Compressor, 2 Oil separator, 2a 1st capillary tube, 3 way switching valve, 4 outdoor heat exchanger, 5 liquid piping, 6a 1st electronic expansion valve, 6b 2nd electronic expansion valve, 7a 1st indoor heat exchange 7b 2nd indoor heat exchanger, 8 gas piping, 9 accumulator, 10 refrigerant piping, 11 liquid blocking valve, 12 gas blocking valve, 13 chloride recovery circuit, 13a solenoid valve, 13b 2nd capillary tube, 14 chloride Recovery means, 14a Refrigerant inlet part, 14b Refrigerant outlet part, 14c Chloride recovery main body part, 14d Activated carbon filter, 14f Strainer, 15 Pressure sensor, 16 First two-phase pipe temperature sensor, 17 First liquid pipe temperature sensor, 18a First 2 two-phase tube temperature sensor, 18b third two-phase tube temperature sensor, 19a second liquid tube temperature sensor, 19b third liquid tube temperature sensor, 20 outdoor control board, 21 Indoor control board, 22 remote control, 23 chloride recovery operation button.

Claims (2)

Compressor, oil separator for separating refrigerating machine oil in gas refrigerant, four-way switching valve, outdoor heat exchanger, liquid piping, a plurality of decompression devices, a first electronic expansion valve, a second electronic expansion valve, and a plurality of indoor heats A first indoor heat exchanger as a exchanger, a second indoor heat exchanger, a gas pipe, an accumulator for storing surplus refrigerant, and a first for returning the oil separated from the gas refrigerant to the compressor suction side by the oil separator In a multi-type air conditioner having a refrigerant circuit composed of a plurality of indoor heat exchangers and a single outdoor heat exchanger connected in communication with refrigerant pipes, a chloride pipe is provided in parallel with the first capillary. A chloride recovery means having an activated carbon filter is provided in the circuit, and a chloride recovery operation button is provided on the outdoor unit control board, and when the chloride recovery operation button is turned on, the chloride A recovery operation is performed to Multi-type air conditioner which is characterized in that so as to flow the refrigerant in the refrigerant circuit all made of the indoor heat exchanger and a single outdoor heat exchanger. A remote controller connected to the indoor unit control board, the remote controller includes a chloride recovery operation button, and when the chloride recovery operation button is turned on, the chloride recovery operation is performed, and the plurality of indoor heat exchangers The multi-type air conditioner according to claim 1, wherein the refrigerant is caused to flow through all refrigerant circuits including a single outdoor heat exchanger.

Images