JP2011163641A - Refrigerating cycle device and hot water heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating cycle device improved in the reliability of a compressor even when the heating operation is started in a condition with a low outside temperature and a low heating medium temperature. <P>SOLUTION: The refrigerating cycle device includes the compressor 21, a refrigerant circuit 2 consisting of a refrigerant side passage 22a etc. of a condenser 22, a heating medium side passage 22b of the condenser 22, and a heating medium circuit 7 consisting of an auxiliary heating means 73 etc. Upon starting the heating operation with both of the compressor 21 and auxiliary heating means 73 stopped, the operation of auxiliary heating means 73 is started first, and then the operation of compressor 21 is started. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a refrigeration cycle apparatus that performs a heating operation using the latent heat of condensation of a condenser, and a hot water heater using the refrigeration cycle apparatus.

  2. Description of the Related Art Conventionally, a refrigeration cycle apparatus is known that generates warm water by using condensation latent heat of a condenser, supplies the warm water to a terminal device such as a fan coil unit or a panel heater, and performs a heating operation. As such a refrigeration cycle apparatus, there is one that includes an auxiliary heat source heating means (auxiliary heating means) that operates with an independent power source, apart from a heat pump heat source machine (refrigeration cycle means) (see, for example, Patent Document 1).

  This refrigeration cycle apparatus includes a refrigeration cycle means for heating a hydrothermal medium with a refrigerant via a heat exchanger (condenser), a water supply means for feeding the hydrothermal medium, and a hydrothermal medium when the outside air temperature is low. It consists of auxiliary heating means for heating, and terminal equipment for heating with a heated hydrothermal medium.

  When starting the heating operation, this refrigeration cycle apparatus first operates the compressor of the refrigeration cycle means. The refrigerant compressed by the compressor flows into the condenser and heats the hydrothermal medium with the condenser. The water heating medium heated by the condenser is fed by the water feeding means to the auxiliary heating means and the terminal device. The water heat medium sent to the terminal device is heated and radiated, and then flows into the condenser again.

  The refrigeration cycle means heats the hydrothermal medium to a temperature at which the terminal device can be heated. However, when the outside air temperature is low, the refrigeration cycle means alone cannot be sufficiently heated, and the temperature of the hydrothermal medium may not be a temperature at which the terminal device can be heated. In this case, the auxiliary heating means is operated, and water is further heated by the auxiliary heating means until a temperature at which the terminal device can be heated is reached.

JP 2004-132612 A

  However, in the conventional refrigeration cycle apparatus, when the compressor is started, the auxiliary heating means does not heat, so even if the compressor is started, the temperature of the water heat medium (heat medium) in the condenser, It takes time for the temperature and pressure (condensation pressure) of the refrigerant that exchanges heat with the heat medium to rise. For this reason, if the compressor is started in a state where the temperature of the heat medium is low, such as after the refrigeration cycle device has been stopped for a long time in a state where the outside air temperature is low, the condensing pressure does not rise sufficiently, and the compressor starts up. Will continue for a long time. In a state where the condensation pressure is low, a sufficient pressure difference for supplying oil cannot be obtained, and oil supply to the sliding portion of the compressor becomes insufficient. Thus, in the conventional refrigeration cycle apparatus, when the heating operation is started from a state where the outside air temperature or the temperature of the heat medium is low, there is a problem that the reliability of the compressor is reduced when the compressor is started.

  This invention solves the said conventional subject, and it aims at providing the refrigerating-cycle apparatus and hot water heating apparatus which improve the reliability of the compressor at the time of starting heating operation.

  In order to solve the above-described conventional problems, a refrigeration cycle apparatus according to the present invention includes a compressor, a refrigerant side flow path of a condenser, an expansion means, a refrigerant circuit formed by sequentially connecting an evaporator, and a condenser. A heating medium circuit that is formed by sequentially connecting a heating medium side channel through which a heating medium that exchanges heat with the refrigerant in the refrigerant side channel, and an auxiliary heating unit, and a control device. After heating the heat medium flowing through the heat medium side flow path of the condenser, the operation of the compressor is started.

  Thus, the refrigerant in the condenser is indirectly heated by the auxiliary heating means, and the pressure of the refrigerant is increased, and then the operation of the compressor is started.

  In the refrigeration cycle apparatus of the present invention, the refrigerant pressure in the condenser is increased in advance, so that the oil supply to the sliding portion of the compressor is improved and the reliability of the compressor when starting the heating operation is improved. Can be improved.

Schematic configuration diagram of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. Control flowchart according to Embodiment 1 of the present invention Schematic configuration diagram of a refrigeration cycle apparatus according to Embodiment 2 of the present invention. Control flowchart in Embodiment 2 of the present invention

  A first invention includes a compressor, a refrigerant side flow path of the condenser, an expansion means, a refrigerant circuit formed by sequentially connecting the evaporator, a refrigerant provided in the condenser, and a refrigerant in the refrigerant side flow path. A heat medium circuit formed by sequentially connecting a heat medium side passage through which a heat medium to exchange heat, an auxiliary heating means, and a control device are provided. After the heat medium is heated by the auxiliary heating means, the compressor is By starting the compressor, it is possible to start the compressor with good oil supply to the sliding part of the compressor by increasing the refrigerant pressure in the condenser in advance, and improve the reliability of the compressor be able to.

  The second invention, in particular, in the refrigeration cycle apparatus of the first invention, comprises pressure detection means for detecting the pressure of the refrigerant in the condenser, and if the detection value of the pressure detection means exceeds a predetermined value, By starting the operation of the compressor, the compressor can be started in a state in which the refrigerant pressure in the condenser is reliably increased, and the reliability of the compressor can be improved.

  In particular, the third aspect of the invention is the refrigeration cycle apparatus of the first aspect of the invention, further comprising temperature detecting means for detecting the temperature of the condenser, and if the detected value of the temperature detecting means exceeds a predetermined value, the compressor By starting the operation, the compressor can be started in a state where the refrigerant pressure in the condenser has surely increased, and the reliability of the compressor can be improved. Further, the reliability of the compressor can be easily improved by using an inexpensive temperature detecting means.

  According to a fourth aspect of the invention, in particular, in the refrigeration cycle apparatus according to any one of the first to third aspects of the invention, the heat medium flowing through the heat medium circuit is water or an antifreeze liquid, so that hot water heating is performed when the outside air temperature is low. The reliability of the compressor of the apparatus can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a refrigeration cycle apparatus according to a first embodiment of the present invention. In FIG. 1, the refrigeration cycle apparatus includes a refrigeration cycle means 1 including a refrigerant circuit 2 that circulates a refrigerant, a heat medium circuit 7 that circulates a heat medium heated by the refrigerant, and a control device 3.

  The refrigerant circuit 2 is formed by sequentially connecting a compressor 21, a refrigerant side flow path 22a of a condenser 22, an expansion valve (expansion means of the present invention) 23, and an evaporator 24 by piping. The refrigerant side flow path 22a and the heat medium side flow path 22b of the condenser 22 are configured to exchange heat between the refrigerant and the heat medium in the respective flow paths. In the present embodiment, an accumulator 25 that performs gas-liquid separation is provided between the evaporator 24 and the compressor 21. The refrigerant circuit 2 is provided with a four-way valve 26 for switching between normal operation and defrosting operation. In the vicinity of the refrigerant side flow path 22a of the condenser 22, a pressure detection means 51 for detecting the pressure of the refrigerant is provided.

  The heat medium circuit 7 includes a radiator 71 as a terminal device such as a panel heater and a floor heating panel, a circulation pump 72 as a water supply means, an auxiliary heating means 73 for heating the heat medium flowing through the heat medium circuit 7, and a condenser 22. The heat medium side flow path 22b is formed by being sequentially connected by piping. The auxiliary heating means 73 is installed on the inlet side of the heat medium side flow path 22 b of the condenser 22, and can heat the heat medium flowing into the condenser 22.

  The control device 3 controls the compressor 21 and the auxiliary heating means 73 to perform a predetermined operation, and is configured as a part of an electronic control board (not shown).

  About the refrigerating-cycle apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  In FIG. 1, the flow direction of the refrigerant and the heated heat medium during the heating operation is indicated by arrows. When the heating operation is performed, the high-pressure refrigerant discharged from the compressor 21 flows into the refrigerant side flow path 22b of the condenser 22 via the four-way valve 26, and the heat medium side flow path 22b of the condenser 22 The heating medium passing through is heated. The heat medium is water or antifreeze.

  The high-pressure refrigerant that has flowed out of the refrigerant-side flow path 22b of the condenser 22 is decompressed by the expansion valve 23 and expanded, and then flows into the evaporator 24. The low-pressure refrigerant that has flowed into the evaporator 24 absorbs heat from the air and is sucked into the compressor 21 again.

  The heat medium heated in the heat medium side flow path 22b of the condenser 22 is sent to the radiator 71 by the circulation pump 72, and radiates heat to the heating load of the room in which the terminal device is installed. Thereafter, the heat medium passes through the auxiliary heating means 73, returns to the condenser 22 again, and circulates through the heat medium circuit 7.

  Next, the operation for starting the heating operation will be described with reference to the flowchart shown in FIG. First, when starting the heating operation, the control device 3 confirms that the compressor 21 and the auxiliary heating means 73 are stopped (step S1).

  Next, the refrigerant pressure Pc in the refrigerant side flow path 22a of the condenser 22 is detected by the pressure detection means 51 (step S2), and the refrigerant pressure Pc of the condenser 22 is determined in advance in a memory in the control device 3 or the like. To determine whether or not the refrigerant pressure Pc is equal to or lower than the predetermined value Po (step S3).

  When the refrigerant pressure Pc of the condenser 22 is not more than the predetermined value Po, the auxiliary heating means 73 is operated (step S4), and the temperature of the heat medium flowing into the heat medium side flow path 22b of the condenser 22 is increased. By raising the temperature of the heat medium flowing into the heat medium side flow path 22b, the refrigerant in the refrigerant side flow path 22a of the condenser 22 is indirectly heated. Then, it returns to step S2 and repeats the operation | movement of step S2 to S3.

On the other hand, when the refrigerant pressure Pc of the condenser 22 exceeds the predetermined value Po in step S3, the auxiliary heating means 73 is stopped (step S5), and the compressor 21 is operated (step S6).

  As described above, in the present embodiment, even when the heating operation is started from a state where the outside air temperature or the temperature of the heat medium is low, the operation of the compressor 21 and the auxiliary heating unit 73 is stopped. Then, after starting the operation of the auxiliary heating means 73 and increasing the pressure of the refrigerant in the condenser 22, the operation of the compressor 21 is started, so that the oil supply to the sliding portion of the compressor 21 is good. The compressor 21 can be started, and the reliability of the compressor 21 can be improved.

  Further, the rising speed of the refrigerant pressure in the condenser 22 can be increased, and accordingly, the increase in the evaporation pressure, which is the pressure of the refrigerant in the evaporator 24, is also accelerated, so that the proper operating range of the compressor 21 (predetermined evaporation) Operation in the operation range above the lower pressure limit value is possible, and the reliability of the compressor 21 can be improved.

  In particular, the auxiliary heating unit 73 is installed on the inlet side of the heat medium side flow path 22b of the condenser 22 into which the heat medium flows, so that the condenser 22 is compared with the case of installing on the outlet side of the condenser 22b. It is possible to increase the temperature rise rate of the heat medium and refrigerant.

  In the present embodiment, the pressure sensor 51 is provided on the outlet side of the condenser 22, but the pressure sensor 51 is a refrigerant as long as it is between the discharge side of the compressor 21 and the inlet side of the expansion valve 23. It may be provided at any position in the circuit 2.

  Further, the auxiliary heating means 73 may be installed on the outlet side of the condenser 22b or between the radiator 71 and the circulation pump 72.

(Embodiment 2)
FIG. 2 shows a schematic configuration diagram of the refrigeration cycle apparatus according to the first embodiment of the present invention. The present embodiment is different from the first embodiment in that a temperature detection unit 52 is provided instead of the pressure detection unit 51. The temperature detecting means 52 is provided at a substantially middle position of the refrigerant side flow path 22 a of the condenser 22 and detects the temperature of the refrigerant in the refrigerant side flow path 22 a of the condenser 22.

  In the present embodiment, when starting the heating operation, the control device 3 confirms that the compressor 21 and the auxiliary heating means 73 are stopped (step S11).

  Next, the temperature Tc in the refrigerant side flow path 22a of the condenser 22 is detected by the temperature detection means 52 (step S12), and the temperature Tc of the condenser 22 is stored in a predetermined memory or the like in the control device 3. It is compared with the predetermined value To, and it is determined whether or not the temperature Tc is equal to or lower than the predetermined value To (step S13). The predetermined value To is determined in advance from a correlation between the detected temperature of the temperature detecting means 52 and the refrigerant pressure of the condenser 22 and a temperature corresponding to the condensing pressure that can sufficiently supply oil to the sliding portion of the compressor 21 in advance. It is what I have sought.

  When the temperature Tc of the condenser 22 is equal to or lower than the predetermined value To, the auxiliary heating means 73 is operated (step S14), and the temperature of the heat medium flowing into the heat medium side flow path 22b of the condenser 22 is increased. By raising the temperature of the heat medium flowing into the heat medium side flow path 22b, the refrigerant in the refrigerant side flow path 22a of the condenser 22 is indirectly heated. Then, it returns to step S12 and repeats the operation | movement of step S12 to S13.

  On the other hand, when the temperature Tc of the condenser 22 exceeds the predetermined value To in step S13, the auxiliary heating means 73 is stopped (step S15), and the compressor 21 is operated (step S16).

  As described above, in the present embodiment, the refrigeration cycle apparatus of the present invention can be easily realized by using the temperature detection means 52 that is less expensive than the pressure detection means 51.

  In the present embodiment, the temperature detecting means 52 is provided at a position substantially in the middle of the refrigerant side flow path 22a of the condenser 22, but in the vicinity of the heat medium side flow path 22b of the condenser 22 or the condensation. It may be provided in a heat medium circuit between the outlet side of the heater 22 and the inlet side of the radiator 71 to detect the temperature of the heat medium. In this case, the predetermined value To may be obtained in advance from the correlation between the temperature of the heat medium and the refrigerant pressure in the condenser 22.

  As described above, the refrigeration cycle apparatus according to the present invention can increase the reliability of the compressor when starting the heating operation when the outside air temperature is low, and therefore generates hot water and heats the hot water. It can be applied to uses such as hot water heaters, hot water coolers / heaters, hot water hot water heaters and the like used for hot water supply.

DESCRIPTION OF SYMBOLS 1 Refrigeration cycle apparatus 2 Refrigerant circuit 3 Control apparatus 7 Heat-medium circuit 21 Compressor 22 Condenser 23 Expansion valve (expansion means)
24 Evaporator 51 Pressure detecting means 52 Temperature detecting means 73 Auxiliary heating means

Claims (4)

A compressor, a refrigerant side channel of the condenser, an expansion means, and a refrigerant circuit formed by sequentially connecting the evaporator, and heat that is provided in the condenser and exchanges heat with the refrigerant in the refrigerant side channel. A heat medium circuit formed by sequentially connecting a heat medium side flow path through which the medium flows, and auxiliary heating means, and a control device, and after heating the heat medium by the auxiliary heating means, the compressor is operated. A refrigeration cycle apparatus characterized by starting. 2. The compressor according to claim 1, further comprising pressure detecting means for detecting the pressure of the refrigerant in the condenser, and starting the operation of the compressor when a detected value of the pressure detecting means exceeds a predetermined value. The refrigeration cycle apparatus described in 1. 2. The compressor according to claim 1, further comprising a temperature detection unit configured to detect a temperature of the condenser, wherein the operation of the compressor is started when a detection value of the temperature detection unit exceeds a predetermined value. Refrigeration cycle equipment. The hot water heater according to any one of claims 1 to 3, wherein the heat medium flowing through the heat medium circuit is water or antifreeze.

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