JPH04225748A - Cooling/heating device - Google Patents

Abstract

PURPOSE:To provide a cooling/heating device which suppresses flowing-in of a gas refrigerant to a refrigerant pump and prevents shortening of life of the refrigerant pump from happening without being influenced by the outside air temperature by a method wherein in a cooling/heating device which is divided into a heat source side refrigerant cycle and a user side refrigerant cycle, the equipment is driven in a cooling cycle until the outside air temperature is detected and a liquid refrigerant is drawn in a refrigerant pump. CONSTITUTION:Heating is detected by a cooling/heating mode detecting means 20, and turning-on of a room temperature thermometer is detected by a room temperature thermometer detecting means 21, and a device driving means 22 drives a compressor 1 and a refrigerant pump 8 from the turning-on of the room temperature thermometer by heating mode for a period of time which is determined by an outside air temperature correction specified time detecting means 25, and the title cooling/heating device is constituted of a control device 26 which cooling-cycle-drives a heat source side refrigerant cycle 4-way valve 2 and a user side refrigerant cycle 4-way valve 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating and cooling system that is separated into a heat source side refrigerant cycle and a user side refrigerant cycle.

0002

[Prior Art] A conventional heating and cooling system separated into a heat source side refrigerant cycle and a user side refrigerant cycle is known from, for example, Japanese Patent Laid-Open No. 62
It is shown in the publication No.-272040.

[0003] Hereinafter, a conventional air-conditioning system of this type will be explained with reference to the drawings. In FIG. 7, 1 is a compressor, 2 is a four-way valve on the heat source side refrigerant cycle which becomes a cooling cycle when turned off, 3 is a heat source side heat exchanger, 4 is a pressure reducing device, and 5 is a first auxiliary heat exchanger. are connected in an annular manner to form a heat source side refrigerant cycle 6.

A second auxiliary heat exchanger 7 is integrally formed to exchange heat with the first auxiliary heat exchanger 5.

8 is a refrigerant pump that delivers refrigerant, and 9 is an OF
This is a user-side refrigerant cycle four-way valve that becomes a cooling cycle during F time, and these are housed in the outdoor unit 10. 11 is a user side heat exchanger, which is housed in the indoor unit 12.

[0006] Here, regarding the installation positional relationship between the outdoor unit 10 and the indoor unit 12, it is assumed that the outdoor unit 10 is located at a high location and the indoor unit 12 is located at a low location. Further, the second auxiliary heat exchanger 7, the refrigerant pump 8, the user-side refrigerant cycle four-way valve 9, and the user-side heat exchanger 11 are connected in an annular manner to form a user-side refrigerant cycle 13.

Reference numeral 14 is a remote control for setting cooling, heating, room temperature, etc. Note that 15 to 18 are connection valves for connecting the outdoor unit 10 and the indoor unit 12.

Further, reference numeral 19 indicates start/stop detection means for detecting stoppage or operation of the compressor 1 and refrigerant pump 8, reference numeral 20 indicates cooling/heating mode detection means for detecting cooling or heating, and reference numeral 21 indicates the set temperature set by the remote control 14 and the current temperature. 22 is a device driving means that drives the compressor 1, the heat source side refrigerant cycle four-way valve 2, the refrigerant pump 8, and the user side refrigerant cycle four-way valve 9.

The operation of the heating and cooling system constructed as described above will be explained below. First, consider the case of cooling mode. The start/stop detection means 19 detects the operation mode, the cooling/heating mode detection means 20 detects the cooling mode, the room temperature thermometer detection means 21 detects the turning on of the room temperature thermostat, and the heat source side refrigerant cycle 6 detects the operation mode. The high-temperature, high-pressure gas passes through the heat source side refrigerant cycle four-way valve 2 which is turned off, radiates heat in the heat source side heat exchanger 3, condenses and liquefies, is depressurized in the pressure reducing device 4, and evaporates in the first auxiliary heat exchanger 5. The heat source side refrigerant cycle passes through the four-way valve 2 and circulates to the compressor 1.

At this time, the second refrigerant cycle 13 on the user side
The auxiliary heat exchanger 7 and the first auxiliary heat exchanger 5 exchange heat,
The gas refrigerant in the user side refrigerant cycle 13 is cooled and liquefied.

This liquefied refrigerant passes through the user side refrigerant cycle four-way valve 9 and refrigerant pump 8, which are turned off, and is sent to the user side heat exchanger 11, where it is cooled, absorbs heat, evaporates, and gasifies. It will be circulated to the second auxiliary heat exchanger 7 of the user side refrigerant cycle 13.

Next, consider the heating mode. The start/stop detection means 19 detects the operation mode, the cooling/heating mode detection means 20 detects the heating mode, the room temperature thermometer detection means 21 detects the turning on of the room temperature thermostat, and the heat source side refrigerant cycle 6 detects the operation mode. The high-temperature, high-pressure gas passes through the heat source side refrigerant cycle four-way valve 2 that is turned on, radiates heat in the first auxiliary heat exchanger 5, condenses and liquefies, is depressurized in the pressure reducing device 4, and evaporates in the heat source side heat exchanger 3. The heat source side refrigerant cycle passes through the four-way valve 2 and circulates to the compressor 1.

At this time, the second refrigerant cycle 13 on the user side
The auxiliary heat exchanger 7 and the first auxiliary heat exchanger 5 exchange heat,
The gas refrigerant in the user side refrigerant cycle 13 is heated and gasified.

[0014] This gasified refrigerant is transferred to the user side heat exchanger 1.
1, the user side refrigerant cycle is heated, radiates heat, condenses and liquefies, and is turned on. Four-way valve 9, refrigerant pump 8
The refrigerant is then circulated to the second auxiliary heat exchanger 7 of the user side refrigerant cycle 13.

[0015]

[Problems to be Solved by the Invention] However, in the conventional configuration, since the outdoor unit is located at a high place, the refrigerant that has absorbed heat and turned into gas is sucked into the refrigerant pump inside the outdoor unit. Not only will lubrication deteriorate and the life of the pump will be shortened, but the amount of refrigerant that will be gasified will vary depending on the ambient temperature (outside temperature) of the outdoor unit, and when the outside temperature is high, the amount of refrigerant that will be gasified will increase, further shortening the life of the pump. It had the following drawback.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a heating and cooling system that suppresses the flow of gas refrigerant into a refrigerant pump without being affected by outside temperature.

[0017]

[Means for Solving the Problems] In order to solve the above problems, the air conditioning system of the present invention detects heating with a cooling/heating mode detection means, detects the turning on of the room temperature thermostat with a room temperature thermometer detection means, and corrects the outside temperature. For the time determined by the predetermined time detection means, when the room temperature thermostat is turned on in the heating mode, the device drive means drives the compressor and refrigerant pump, and switches the heat source side refrigerant cycle four-way valve and the user side refrigerant cycle four-way valve into the cooling cycle. It is equipped with a control device for driving.

Further, when the start/stop detection means detects a stop and the minimum temperature detection means detects the lowest temperature, the predetermined time detection means determines a predetermined time, and during this predetermined time, the device driving means is operated. It is equipped with a control device that drives the compressor and refrigerant pump, and drives the heat source side refrigerant cycle four-way valve and the user side refrigerant cycle four-way valve in the cooling cycle.

[0019]

[Function] In the heating and cooling system of the present invention, the control device lengthens the operating time of the equipment in the cooling cycle, which is performed to store liquid refrigerant in the liquid refrigerant tank in the liquid refrigerant tank when heating is started, when the outside temperature is high, and shortens it when the outside temperature is low. Therefore, regardless of the outside temperature, it is possible to suppress the flow of gas refrigerant into the refrigerant pump and prevent shortening of the life of the refrigerant pump.

[0020] In addition, when the control device operates the equipment in a cooling cycle so as to store liquid refrigerant in the liquid refrigerant tank when the outside air temperature reaches the lowest temperature when the air conditioner is stopped, this is done immediately before starting. There is no start-up delay compared to the previous model, and because the outside temperature is low, the time it takes to store liquid refrigerant in the liquid refrigerant tank is short, resulting in power savings.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating and cooling system according to an embodiment of the present invention will be described below with reference to the drawings.

First, the first embodiment will be explained. FIG. 1 is a refrigeration cycle diagram of a heating and cooling system according to a first embodiment of the present invention.

In FIG. 1, components having the same configuration as the conventional one are designated by the same reference numerals, and detailed explanation thereof will be omitted.

Reference numeral 23 denotes a liquid refrigerant tank for storing refrigerant liquid on the user side. Reference numeral 24 is an outside air temperature sensor located somewhere in the outdoor unit 10 to detect the ambient temperature, and 25 is an outside air temperature correction predetermined time detection means that determines a longer time as the temperature detected by the outside air temperature sensor 24 is higher.

26 detects heating with the cooling/heating mode detection means 20, detects the turning on of the room temperature thermometer with the room temperature thermometer detection means 21, and turns on the room temperature thermometer in the heating mode for the time determined by the outside temperature correction predetermined time detection means 25. From the start, the device driving means 22 drives the compressor 1 and the refrigerant pump 8, and is a control device that drives the heat source side refrigerant cycle four-way valve 2 and the user side refrigerant cycle four-way valve 9 in the cooling cycle.

Regarding the air conditioning system of this embodiment configured as described above, the operation of the control device 26 of this embodiment, and the heating mode which is a particular problem here, will be explained using the graph of FIG. 2 and the flowchart of FIG. I will explain only.

FIG. 2 shows the value of the outside temperature sensor 24 and the amount of gasified refrigerant in the user side refrigerant cycle 13 (gas refrigerant amount).
It is also a graph showing the relationship between storage time (specified liquid refrigerant amount recovery time) when the amount of heated and gasified refrigerant recovered and stored as liquid refrigerant in the liquid refrigerant tank 23 is constant.

[0028] As the outside temperature becomes higher, the amount of gas refrigerant increases, and therefore the time required to recover the specified amount of liquid refrigerant also increases.

STEP 1 in FIG. 3 is a cooling/heating determination routine, which is performed by the cooling/heating mode detection means 20.

[0030] If it is the air conditioner, the routine moves to the air conditioner routine. When heating is detected, the process moves to the next STEP 2. STEP
2 is a routine for determining ON/OFF of the room temperature thermometer, and is performed by the room temperature thermometer detection means 21.

[0031] When heating is started, the room temperature thermostat is turned on in STEP 2, and the process moves to STEP 3.

STEP 3 is a routine for determining whether or not the room temperature thermostat is turned on in the heating mode, that is, whether a predetermined period of time has elapsed since the heating was started. Because it is gasified,
Since there is almost no amount of liquid refrigerant in the liquid refrigerant tank 22 and the predetermined time has not elapsed, the process proceeds to STEP 4.

STEP 4 is a routine for setting the refrigerant recovery time based on the outside temperature, which is performed by the outside temperature correction predetermined time detection means 25, and as shown in FIG. 2, when the outside temperature is below A, the collection time is set to C time. Set the collection time to D time when the outside temperature is above A and below B, and set the collection time to E when the outside temperature is above B.
Set to time.

After this, the process moves to STEP 5, where the equipment drive means 22 turns on the compressor 1 and turns on the heat source side refrigerant cycle four-way valve 2.
is OFF, the refrigerant pump 8 is ON, the user side refrigerant cycle four-way valve 9 is OFF, and the heat source side refrigerant cycle 6 and the user side refrigerant cycle 13 form a cooling cycle. That is, for example, when the outside temperature is greater than or equal to A and less than or equal to B, STEP 5 is performed during time D.

As a result, the first auxiliary heat exchanger 5 is cooled, and the second auxiliary heat exchanger 7 formed integrally therewith is also cooled, so that the refrigerant that has been gasified in the outdoor unit 10 is rapidly The liquid refrigerant is liquefied and stored in the liquid refrigerant tank 23.

In this way, the liquid refrigerant is accumulated in the liquid refrigerant tank 23, and when it is determined in STEP 3 that the predetermined time has elapsed, since the specified liquid refrigerant is accumulated in the liquid refrigerant tank 23, the refrigerant pump is turned off. 8, the liquid refrigerant is sucked, and the process moves to STEP 6. In the equipment drive means 22, the compressor 1 is turned on, the heat source side refrigerant cycle four-way valve 2 is turned on,
When the refrigerant pump 8 is turned on and the user side refrigerant cycle four-way valve 9 is turned on, the heat source side refrigerant cycle 6 and the user side refrigerant cycle 13 form a heating cycle to perform heating.

If the room temperature thermometer is OFF in STEP 2, the process moves to STEP 6 and the compressor 1 is turned OFF by the equipment drive means 21.
Naturally, the FF and the refrigerant pump 8 are also turned off to stop the air conditioner, that is, to move to the stop routine.

Next, a second embodiment will be explained. In FIG. 4, 27 is minimum temperature detection means for detecting whether the temperature detected by the outside temperature sensor 24 is the minimum temperature;
8 is a predetermined time detection means for detecting whether a predetermined time has elapsed; 29 is a predetermined time detection means when the start/stop detection means 19 detects stoppage and the minimum temperature detection means 27 detects the minimum temperature; A predetermined time is determined in step 28, and during this predetermined time, the device driving means 22 drives the compressor 1 and the refrigerant pump 8, and the heat source side refrigerant cycle four-way valve 2 and the user side refrigerant cycle four-way valve This is a control device that drives the air conditioner 9 in a cooling cycle.

Regarding the heating and cooling system of this embodiment configured as described above, the operation of the control device 29 of this embodiment will be explained using the graph of FIG. 5 and the flowchart of FIG. 6.

FIG. 5 shows the change in outside temperature from when the air conditioner used during the day is stopped until it is started the next day.

After the engine is stopped, the outside temperature at night gradually decreases and starts to rise again before the engine is started. In other words, it can be seen that the lowest outside temperature is when the air conditioner is stopped.

Furthermore, since the liquid refrigerant can be recovered in the shortest time when the outside temperature is low, it is efficient to operate upon detecting the lowest outside temperature.

STEP 7 in FIG. 6 is a routine for determining whether or not the air conditioner is stopped, which is performed by the start/stop detection means 19. If the air conditioner is not stopped, the process proceeds to STEP 6, and if it is stopped, the process proceeds to STEP 8.

STEP 8 is a routine for determining whether the outside temperature has started to rise, and it is determined whether the temperature change in a minute period has become a positive value. This is done by the minimum temperature detection means 27. When the temperature change is negative, the stop is continued, and when the temperature change is positive, the process moves to STEP9.

STEP 9 is a routine for determining whether a predetermined time has elapsed, and the predetermined time detection means 28
I'm doing it. Initially, since the predetermined time has not elapsed, the process proceeds to STEP 5, and the equipment drive means 22 turns the compressor 1 to O.
N, the heat source side refrigerant cycle four-way valve 2 is OFF, the refrigerant pump 8 is ON, and the user side refrigerant cycle four-way valve 9 is OFF, and the heat source side refrigerant cycle 6 and the user side refrigerant cycle 13 form a cooling cycle.

As a result, the first auxiliary heat exchanger 5 is cooled, and the second auxiliary heat exchanger 7 formed integrally with it is also cooled, so that the refrigerant that has been gasified in the outdoor unit 10 is rapidly The liquid refrigerant is liquefied and stored in the liquid refrigerant tank 23.

As described above, according to this embodiment, the outside air temperature is detected by the outside air temperature sensor 24, and the time is set based on this value, the heat source side refrigerant cycle 6, and the user side refrigerant cycle 1.
In both cases, a cooling cycle is performed, so a constant amount of liquid refrigerant can be recovered regardless of the outside temperature, and the time for the liquid refrigerant to be sucked into the refrigerant pump 8 is shortened, preventing poor lubrication within the refrigerant pump 8 and extending the life of the pump. Become.

Furthermore, according to this embodiment, by utilizing the fact that the outside air temperature is at its lowest when the air conditioner is stopped, this point is detected by the outside air temperature sensor 24, and the heat source side refrigerant cycle 6 and the user side refrigerant are Since cycle 13 also performs the cooling cycle, there is no delay when the air conditioner starts up for cooling or heating, and since the outside temperature is low, the liquid refrigerant recovery time is short and power is saved.

[0049]

As is clear from the above embodiments, the present invention detects heating with the cooling/heating mode detection means, detects the turning on of the room temperature thermostat with the room temperature thermometer detection means, and detects the outside temperature correction predetermined time period with the room temperature thermometer detection means. At the time determined by the heating mode, the equipment drive means drives the compressor and the refrigerant pump, and the controller drives the four-way valve of the refrigerant cycle on the heat source side and the four-way valve of the refrigerant cycle on the user side in the cooling cycle. This is provided for heating and cooling equipment.

[0050] Therefore, the control device operates the equipment in the cooling cycle, which is performed to store liquid refrigerant in the liquid refrigerant tank when heating is started, for a longer time when the outside temperature is high and shorter when the outside temperature is low, regardless of the outside temperature. This has the effect of suppressing the flow of gas refrigerant into the refrigerant pump and preventing shortening of the life of the refrigerant pump.

Further, when the start/stop detection means detects stoppage and the minimum temperature detection means detects the lowest temperature, the predetermined time detection means determines a predetermined time, and during this predetermined time, the device driving means is operated. The air-conditioning system is equipped with a control device that drives the compressor and refrigerant pump and drives the heat source side refrigerant cycle four-way valve and the user side refrigerant cycle four-way valve in the cooling cycle, so liquid refrigerant can be stored in the liquid refrigerant tank due to low outside temperatures. It takes less time and has the effect of saving power.

[Brief explanation of the drawing]

FIG. 1: Refrigeration cycle diagram of a heating and cooling system in a first embodiment of the present invention.

[Fig. 2] Graph showing the correlation between the outside temperature, gas refrigerant amount, and specified liquid refrigerant amount recovery time of the air conditioning system in the same example.

[Figure 3] Operation flowchart of the heating and cooling device in the same embodiment

FIG. 4: Diagram of the refrigeration cycle of the heating and cooling device in the second embodiment of the present invention.

[Figure 5] Temporal change graph of outside temperature of the air conditioning system in the same example

[Fig. 6] Operation flowchart of the heating and cooling device in the same embodiment.

[Figure 7] Refrigeration cycle diagram of conventional heating and cooling equipment

[Explanation of symbols]

1 Compressor 2 Heat source side refrigerant cycle four-way valve 3 Heat source side heat exchanger 4　Pressure reduction device 5 First auxiliary heat exchanger 6 Heat source side refrigerant cycle 7 Second auxiliary heat exchanger 8 Refrigerant pump 9 User side refrigerant cycle four-way valve 10 Outdoor unit 11 User side heat exchanger 12 Indoor unit 13 User side refrigerant cycle 20 Cooling/heating mode detection means 21 Room temperature thermo detection means 22 Equipment driving means 23 Liquid refrigerant tank 24 Outside temperature sensor 25 Outside temperature correction predetermined time detection means 26 Control device

Claims (2)

[Claims] [Claim 1] Compressor, heat source side refrigerant cycle four-way valve,
a heat source side refrigerant cycle formed by connecting a heat source side heat exchanger, a pressure reduction device, and a first auxiliary heat exchanger in an annular manner; a second auxiliary heat exchanger formed integrally with the first auxiliary heat exchanger and exchanging heat; A user-side refrigerant cycle consisting of a user-side heat exchanger, a user-side refrigerant cycle four-way valve, a refrigerant pump for delivering refrigerant, and a liquid refrigerant tank for storing user-side refrigerant liquid connected in a ring;
The outdoor refrigerant cycle, which is located at a high place, is composed of the heat source side refrigerant cycle, the second auxiliary heat exchanger, the user side refrigerant cycle four-way valve, the refrigerant pump, the liquid refrigerant tank, and an outside temperature sensor that detects the ambient temperature. an indoor unit configured from the user-side heat exchanger and located at a low location; a cooling/heating mode detection means for detecting cooling or heating; a room temperature thermometer detection means for detecting whether the room temperature thermostat is turned on or off; an outside temperature correction predetermined time detection means that determines a longer time as the temperature detected by the air temperature sensor is higher, and drives the compressor, the heat source side refrigerant cycle four-way valve, the refrigerant pump, and the user side refrigerant cycle four-way valve. equipment driving means for detecting heating by the cooling/heating mode detecting means, detecting the turning on of the room temperature thermo by the room temperature thermo detecting means, and controlling the room temperature in the heating mode for a time determined by the outside temperature correction predetermined time detecting means. When the thermostat is turned on, the device driving means is constituted by a control device that drives the compressor and the refrigerant pump, and drives the heat source side refrigerant cycle four-way valve and the user side refrigerant cycle four-way valve in the cooling cycle. Features heating and cooling equipment. [Claim 2] Compressor, heat source side refrigerant cycle four-way valve,
a heat source side refrigerant cycle formed by connecting a heat source side heat exchanger, a pressure reduction device, and a first auxiliary heat exchanger in an annular manner; a second auxiliary heat exchanger formed integrally with the first auxiliary heat exchanger and exchanging heat; A user-side refrigerant cycle consisting of a user-side heat exchanger, a user-side refrigerant cycle four-way valve, a refrigerant pump for delivering refrigerant, and a liquid refrigerant tank for storing user-side refrigerant liquid connected in a ring;
The outdoor refrigerant cycle, which is located at a high place, is composed of the heat source side refrigerant cycle, the second auxiliary heat exchanger, the user side refrigerant cycle four-way valve, the refrigerant pump, the liquid refrigerant tank, and an outside temperature sensor that detects the ambient temperature. an indoor unit configured from the user-side heat exchanger and placed at a low location; a start/stop detection means for detecting stoppage or operation of the compressor and refrigerant pump; and detection by the outside temperature sensor. minimum temperature detection means for detecting whether the temperature is the minimum temperature; predetermined time detection means for detecting whether a predetermined time has elapsed; the compressor, the heat source side refrigerant cycle four-way valve, the refrigerant pump, and the user side. equipment driving means for driving a refrigerant cycle four-way valve;
When the start/stop detection means detects a stop and the minimum temperature detection means detects a minimum temperature, the predetermined time detection means determines a predetermined time, and during this predetermined time, the device drive means 1. An air-conditioning and heating system comprising a control device that drives a compressor and the refrigerant pump, and drives the heat source side refrigerant cycle four-way valve and the user side refrigerant cycle four-way valve in a cooling cycle.