Heat pump system and air conditioner

Abstract

The utility model relates to the technical field of heat pumps, and provides a heat pump system and an air conditioner, the heat pump system comprises a first pipeline provided with a second expansion valve, a second pipeline, a compressor, a condenser, a first passage of a first economizer, a first passage of a second economizer, a first expansion valve, an evaporator and a second passage of the second economizer, the first pipeline is connected to an outlet of the condenser and a second passage inlet of the first economizer; the second pipeline is connected between a second passage outlet of the first economizer and the compressor, the output of the condenser is divided into two paths, one path enters the first passage of the first economizer and exchanges heat with the other path which enters the second passage of the first economizer after being cooled by a second expansion valve; the refrigerant cooled by the first passage of the first economizer enters the first passage of the second economizer and performs secondary heat exchange with the low-temperature gas output by the evaporator, so that the supercooling degree of the refrigerant entering the evaporator is reduced, the temperature of the gas entering the air suction port of the compressor is increased, and the energy efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat pump technical field especially relates to a kind of heat pump system and air conditioner. BACKGROUND

[0002] Supplement gas and enthalpy increasing technology is an advanced and efficient air conditioning technology, which can significantly improve the refrigeration capacity and efficiency of the system, has very broad application prospect and market prospect, not only can be applied to household air conditioner and commercial air conditioner, but also can be applied to other refrigeration equipment, such as refrigerator, refrigerator truck etc..At present, supplement gas and enthalpy increasing technology has been widely used in heat pump hot water and heating project, supplement gas and enthalpy increasing technology increases the heating capacity of compressor under severe cold, can operate in low temperature (minus 25 °) environment even lower temperature.

[0003] However, in extremely low temperature (such as minus 35 degrees °) environment, heating efficiency attenuation is larger, resulting in lower energy efficiency. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of heat pump system and air conditioner, to solve the defect that heating efficiency attenuation is larger in prior art in extremely low temperature, resulting in lower energy efficiency, adopt double economizer can normally operate in extremely low temperature, effectively improve energy efficiency.

[0005] The utility model provides a kind of heat pump system, comprising:

[0006] Refrigerant circulation loop, comprising the compressor, condenser, first passage of first economizer, first passage of second economizer, first expansion valve, evaporator and second passage of second economizer connected in sequence;

[0007] Supplement gas branch, comprising first pipeline and second pipeline, the first pipeline is connected between the outlet of the condenser and the second passage inlet of the first economizer, the first pipeline is provided with second expansion valve;The second pipeline is connected between the second passage outlet of the first economizer and the supplement gas port of the compressor.

[0008] According to the heat pump system provided by the utility model, the refrigerant circulation loop further includes a control valve, the control valve includes a first port and a second port in communication, and a third port and a fourth port in communication, the first port is connected to the exhaust port of the compressor, the second port is connected to the inlet of the condenser, the third port is connected to the outlet of the evaporator, and the fourth port is connected to the second passage inlet of the second economizer.

[0009] According to the heat pump system provided by the utility model, the control valve is a four-way valve.

[0010] The heat pump system provided by the utility model, the refrigerant circulation loop further includes a gas-liquid separator, the gas-liquid separator is arranged between the second passage outlet of the second economizer and the suction port of the compressor.

[0011] The heat pump system provided by the utility model further includes a controller electrically connected with the first expansion valve, the exhaust port of the compressor is provided with a first pressure sensor, the air supplementing port of the compressor is provided with a second pressure sensor, and the controller is used for controlling the opening degree of the first expansion valve according to the detection results of the first pressure sensor and the second pressure sensor.

[0012] The heat pump system provided by the utility model, the controller is electrically connected with the second expansion valve.

[0013] The heat pump system provided by the utility model, the first economizer and / or the second economizer is a flash economizer.

[0014] The heat pump system provided by the utility model, the first expansion valve and / or the second expansion valve is an electronic expansion valve.

[0015] The heat pump system provided by the utility model, the refrigerant circulation loop further includes a filter, and the filter is arranged between the gas-liquid separator and the suction port of the compressor.

[0016] The utility model further provides an air conditioner which comprises the heat pump system of any one of the above.

[0017] The heat pump system and the air conditioner provided by the utility model, the high-temperature liquid output by the condenser is divided into two paths, one of which enters the first passage of the first economizer and exchanges heat with the other path which enters the second passage of the first economizer after being cooled by the second expansion valve; the refrigerant cooled in the first passage of the first economizer enters the first passage of the second economizer and exchanges heat with the low-temperature gas output by the evaporator for the second time, which can reduce the supercooling degree of the refrigerant entering the evaporator, improve the heat absorption capacity, increase the temperature of the gas entering the suction port of the compressor and improve the heating capacity, so that the system can operate normally under extremely low temperature and effectively improve the energy efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0019] Figure 1Is the structural schematic diagram of the heat pump system provided by the utility model.

[0020] Reference signs:

[0021] 1, compressor;2, control valve;3, condenser;4, first expansion valve;5, first economizer;51, first inlet;52, first outlet;53, second inlet;54, second outlet;6, second economizer;61, third inlet;62, third outlet;63, fourth inlet;64, fourth outlet;7, second expansion valve;8, evaporator;9, gas-liquid separator;10, first pipeline;11, second pipeline. DETAILED DESCRIPTION

[0022] The embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0023] In the description of the embodiments of the utility model, it should be explained that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the utility model, it should be explained that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0025] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be "above", "over" and "on" the second feature, which can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature can be "under", "below" and "underneath" the second feature, which can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0026] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0027] The first aspect of the present application provides a heat pump system, as shown in the figure, which comprises a compressor 1, a condenser 3, a first economizer 5, a second economizer 6, a first expansion valve 4, an evaporator 8, a second economizer 6 and a gas supplement branch. Figure 1 As shown in the figure, the heat pump system comprises a compressor 1, a condenser 3, a first economizer 5, a second economizer 6, a first expansion valve 4, an evaporator 8, a second economizer 6 and a gas supplement branch.

[0028] The compressor 1, the condenser 3, the first passage of the first economizer 5, the first passage of the second economizer 6, the first expansion valve 4, the evaporator 8 and the second passage of the second economizer 6 are connected in sequence to form a refrigerant circulation loop; the gas supplement branch comprises a first pipeline 10 and a second pipeline 11, the first pipeline 10 is connected between the outlet of the condenser 3 and the inlet of the second passage of the first economizer 5, and the first pipeline 10 is provided with a second expansion valve 7; the second pipeline 11 is connected between the outlet of the second passage of the first economizer 5 and the gas supplement port of the compressor 1.

[0029] It can be understood that the high-temperature gaseous refrigerant (refrigerant) output by the compressor 1 enters the condenser 3, and the condenser 3 outputs high-temperature refrigerant liquid after heat exchange. A part of the high-temperature refrigerant liquid enters the first passage of the first economizer 5, and exchanges heat with another part of the high-temperature refrigerant liquid which is throttled by the second expansion valve 7 and outputs low-temperature refrigerant. After the first heat exchange, the low-temperature gas in the second passage of the first economizer 5 returns to the air inlet of the compressor 1, so that the suction temperature and pressure are increased in the refrigeration cycle, and the heating efficiency of the source heat pump is improved. The refrigerant in the first passage of the first economizer 5 after cooling enters the first passage of the second economizer 6, and exchanges heat with the low-temperature gas output by the evaporator 8. After the second heat exchange, the refrigerant in the first passage of the second economizer 6 after cooling enters the evaporator 8, and the refrigerant in the second passage of the second economizer 6 returns to the compressor 1.

[0030] It should be noted that the first passage of the second economizer 6 exchanges heat with the low-temperature gas output by the evaporator 8 twice, which can not only further reduce the supercooling degree of the refrigerant before entering the evaporator 8, improve the heat absorption capacity, but also increase the suction temperature of the compressor 1, and improve the heating capacity.

[0031] It should be noted that when the outdoor temperature is extremely low, the heat exchange capacity of the outdoor unit decreases, the return gas amount of the compressor 1 decreases, and the power of the compressor 1 decreases, so that the best effect cannot be achieved. The first economizer 5 of the embodiment supplements the refrigeration gas, so that the exhaust amount of the compressor 1 is increased, the circulating refrigerant amount of the indoor unit heat exchanger for heating is increased, the heating capacity is increased, and therefore the embodiment is more suitable for cold regions.

[0032] The heat pump system provided by the embodiment of the utility model, the high-temperature liquid output by the condenser 3 is divided into two ways, one of which enters the first passage of the first economizer 5 and exchanges heat with the other way which enters the second passage of the first economizer 5 after being cooled by the second expansion valve 7. The refrigerant in the first passage of the first economizer 5 after cooling enters the first passage of the second economizer 6 and exchanges heat with the low-temperature gas output by the evaporator 8 twice, which can reduce the supercooling degree of the refrigerant entering the evaporator 8 to improve the heat absorption capacity, and can increase the temperature of the gas entering the suction port of the compressor 1 to improve the heating capacity, so that the heat pump system can operate normally under extremely low temperature and effectively improve the energy efficiency.

[0033] According to the embodiment of the utility model, the compressor 1 adopts a charge-incremental enthalpy compressor, the charge-incremental enthalpy compressor has a charge inlet, a suction inlet and an exhaust outlet, the charge inlet is connected to the outlet of the second pipeline 11, the inlet of the second pipeline 11 is connected to the outlet of the second passage of the first economizer 5, the exhaust outlet is connected to the inlet of the condenser 3, and the suction inlet is connected to the outlet of the second passage of the second economizer 6.

[0034] In an embodiment of the utility model, the refrigerant circulation loop further comprises a control valve 2, the control valve 2 comprises a first port and a second port in communication and a third port and a fourth port in communication, the first port is connected to the exhaust port of the compressor 1, the second port is connected to the inlet of the condenser 3, the third port is connected to the outlet of the evaporator 8, and the fourth port is connected to the second channel inlet of the second economizer 6.

[0035] Optionally, the control valve 2 is a four-way valve, and the four-way valve has a D port, an E port, a C port and an S port, namely, the first port, the second port, the third port and the fourth port respectively.

[0036] Further, the refrigerant circulation loop further comprises a gas-liquid separator 9, and the gas-liquid separator 9 is arranged between the second channel outlet of the second economizer 6 and the suction port of the compressor 1.

[0037] In an embodiment of the utility model, the controller is electrically connected with the first expansion valve 4, and the controller can control the closing, opening and opening degree of the first expansion valve 4.

[0038] Optionally, the exhaust port of the compressor 1 is provided with a first pressure sensor, the air supplementing port of the compressor 1 is provided with a second pressure sensor, and the controller is used for controlling the opening degree of the first expansion valve 4 according to the detection results of the first pressure sensor and the second pressure sensor.

[0039] It can be understood that the first expansion valve 4 is controlled to open when the first detection pressure of the first pressure sensor is greater than the second detection pressure of the second pressure sensor, and the first expansion valve 4 is controlled to close when the first detection pressure of the first pressure sensor is less than the second detection pressure of the second pressure sensor. It needs to be explained here that the opening degree of the second expansion valve 7 can be adjusted according to factors such as outdoor working conditions and water temperature in the case that the first expansion valve 4 is opened, so as to control the refrigerant flow.

[0040] Further, the controller can be electrically connected with the second expansion valve 7, the controller controls the closing, opening and opening degree of the second expansion valve 7, and the opening degree of the second expansion valve 7 can be adjusted according to factors such as outdoor working conditions and water temperature, so as to control the refrigerant flow.

[0041] It can be understood that the controller is electrically connected with the first expansion valve 4 and the second expansion valve 7 respectively, and the controller can adjust the opening degree of the first expansion valve 4 and the second expansion valve 7 according to factors such as environmental temperature and load demand, so as to realize different enthalpy increasing strategies, make the heat pump system be able to maintain the best heating effect under various conditions, and improve the reliability and comfort of the system.

[0042] In the embodiment, the first expansion valve 4 and the second expansion valve 7 are electronic expansion valves, and the first economizer 5 and the second economizer 6 are flash-type economizers.

[0043] In one embodiment of the present application, the refrigerant circulation loop further comprises a filter, which is arranged between the gas-liquid separator 9 and the suction port of the compressor 1.

[0044] In one embodiment of the present application, the heat pump system comprises a compressor 1, a condenser 3, a first economizer 5, a second economizer 6, a first expansion valve 4, an evaporator 8, a second economizer 6, a control valve 2, a gas-liquid separator 9, and a gas supplement branch.

[0045] The compressor 1 is a gas supplement enthalpy increasing compressor, and has a gas supplement port, a suction port, and a discharge port.

[0046] The control valve 2 is a four-way valve, which has four ports, namely a D port, an E port, a C port, and an S port, the D port and the E port are communicated, and the C port and the S port are communicated.

[0047] The first economizer 5 comprises a first inlet 51, a first outlet 52, a second inlet 53, and a second outlet 54, the first inlet 51 and the first outlet 52 are communicated to form a first channel of the first economizer 5, and the second inlet 53 and the second outlet 54 are communicated to form a second channel of the first economizer 5.

[0048] The second economizer 6 comprises a third inlet 61, a third outlet 62, a fourth inlet 63, and a fourth outlet 64, the third inlet 61 and the third outlet 62 are communicated to form a first channel of the second economizer 6, and the fourth inlet 63 and the fourth outlet 64 are communicated to form a second channel of the second economizer 6.

[0049] The gas supplement branch comprises a first pipeline 10, a second pipeline 11, and a second expansion valve 7 arranged on the first pipeline 10.

[0050] The discharge port of the compressor 1 is connected to the D port, the E port is connected to the inlet of the condenser 3, the first inlet 51 is connected to the outlet of the condenser 3, the first outlet 52 is connected to the third inlet 61, the inlet of the first pipeline 10 is connected to the outlet of the condenser 3, the outlet of the first pipeline 10 is connected to the second inlet 53, the second outlet 54 is connected to the gas supplement port of the compressor 1 through the second pipeline 11, the third outlet 62 is connected to the inlet of the evaporator 8 through the first expansion valve 4, the outlet of the evaporator 8 is connected to the C port, the S port is connected to the fourth inlet 63, the fourth outlet 64 is connected to the gas-liquid separator 9, and the gas-liquid separator 9 is connected to the suction port of the compressor 1.

[0051] Wherein, the compressor 1 is by compressing gas to increase pressure and temperature, so that the refrigerant can evaporate and condense at room temperature, the air inlet is mainly used for introducing a certain amount of external gas, which will be compressed with the refrigerant; The external gas and the refrigerant are compressed into high-temperature and high-pressure gas in the compressor 1, enter the condenser 3, and condense into high-temperature and high-pressure liquid.

[0052] The working process of the heat pump system of the embodiment is as follows: the high-temperature gaseous refrigerant (refrigerant) output by the compressor 1 enters the condenser 3 through the E port of the four-way valve, and the high-temperature gaseous refrigerant is output as a high-temperature refrigerant liquid after heat exchange at the outlet of the condenser 3. The high-temperature refrigerant liquid is divided into two paths, which are the main flow path and the branch flow path, respectively. The main flow path enters the first passage of the first economizer 5, and the branch flow path is throttled by the second expansion valve 7 to exchange heat with the low-temperature refrigerant. The low-temperature gas in the second passage of the first economizer 5 returns to the air inlet of the compressor 1, thereby increasing the suction temperature and pressure in the refrigeration cycle and improving the heating efficiency of the source heat pump. The refrigerant in the first passage of the first economizer 5 after temperature reduction enters the first passage of the second economizer 6, and exchanges heat with the suction refrigerant output from the S port of the first passage of the second economizer 6. The refrigerant in the first passage of the second economizer 6 after temperature reduction enters the evaporator 8, and the refrigerant in the second passage of the second economizer 6 returns to the compressor 1, thereby further reducing the supercooling degree of the refrigerant before entering the evaporator 8, improving the heat absorption capacity, and also improving the suction temperature of the compressor 1 and the heating capacity.

[0053] It can be understood that the heat pump system of the embodiment increases the second economizer 6 on the basis of the conventional air-inlet enthalpy-increasing technology, and the high-temperature liquid at the outlet of the condenser 3 exchanges heat twice with the low-temperature suction gas through the second economizer 6, thereby improving the supercooling degree of the liquid refrigerant before entering the evaporator 8, improving the suction temperature, and further improving the energy efficiency and saving costs.

[0054] The second aspect of the embodiment of the utility model provides an air conditioner, the air conditioner includes the heat pump system provided by any of the above embodiments.

[0055] It can be understood that in the air conditioner provided by the utility model, because the heat pump system is provided, the air conditioner also has the advantages described above.

[0056] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A heat pump system, characterized by, The heat pump system comprises: a refrigerant circulation loop comprising, in sequence, a compressor, a condenser, a first passage of a first economizer, a first passage of a second economizer, a first expansion valve, an evaporator, and a second passage of the second economizer; a gas supplement branch comprising a first pipeline and a second pipeline, the first pipeline being connected between an outlet of the condenser and an inlet of a second passage of the first economizer, the first pipeline being provided with a second expansion valve; the second pipeline being connected between an outlet of the second passage of the first economizer and a gas supplement port of the compressor.

2. The heat pump system of claim 1, wherein, The refrigerant circulation loop further comprises a control valve comprising a first port and a second port in communication, and a third port and a fourth port in communication, the first port being connected to an exhaust port of the compressor, the second port being connected to an inlet of the condenser, the third port being connected to an outlet of the evaporator, and the fourth port being connected to an inlet of the second passage of the second economizer.

3. The heat pump system of claim 2, wherein, The control valve is a four-way valve.

4. The heat pump system of claim 2, wherein, The refrigerant circulation loop further comprises a gas-liquid separator provided between an outlet of the second passage of the second economizer and a suction port of the compressor.

5. The heat pump system of claim 2, wherein, The heat pump system further comprises a controller electrically connected to the first expansion valve, the exhaust port of the compressor is provided with a first pressure sensor, the gas supplement port of the compressor is provided with a second pressure sensor, and the controller is configured to control the opening degree of the first expansion valve according to detection results of the first pressure sensor and the second pressure sensor.

6. The heat pump system of claim 5, wherein, The controller is electrically connected to the second expansion valve.

7. The heat pump system according to any one of claims 1 to 6, characterized in that, The first economizer and / or the second economizer is a flash economizer.

8. The heat pump system according to any one of claims 1 to 6, characterized in that, The first expansion valve and / or the second expansion valve is an electronic expansion valve.

9. The heat pump system of claim 4, wherein, The refrigerant circulation loop further comprises a filter provided between the gas-liquid separator and the suction port of the compressor.

10. An air conditioner characterized by comprising: The heat pump system comprises the heat pump system according to any one of claims 1 to 9.

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