Double-loop economizer and air conditioner

Abstract

The utility model relates to a double-loop economizer and an air conditioner. The utility model relates to a double-loop economizer, which comprises a main channel, an indoor heat exchanger and an outdoor heat exchanger, a refrigerant outlet of the enthalpy-increasing loop channel is connected with an enthalpy-increasing opening of the compressor in a conducting manner, and the enthalpy-increasing loop channel is used for guiding a refrigerant into the enthalpy-increasing opening of the compressor; a refrigerant outlet of the heat return loop channel is connected with an air return port of the compressor in a conducting manner, and the heat return loop channel is used for guiding a refrigerant into the air return port of the compressor; in the working state, the enthalpy increasing loop channel and the heat return loop channel exchange heat with the main channel at the same time. According to the double-loop economizer, the heat return loop channel is additionally arranged on a traditional economizer, the return air temperature and the return air superheat degree are increased, then the purpose of increasing the exhaust temperature is achieved, and therefore the problem that lubricating oil of a compressor is diluted by refrigerants is solved; and meanwhile, the refrigerant of the main channel can be subjected to double cooling, and the refrigerant liquid amount is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a double-circuit economizer and an air conditioner comprising the double-circuit economizer. Background Art

[0002] The heat exchange capacity of current air conditioning heat pump systems attenuates more severely when the ambient temperature is worse. Existing economizers overcome the above problems by setting up an enthalpy-increasing air supply circuit to supply air to the compressor. However, for refrigerants with low adiabatic index and relatively low exhaust temperature, when the heat pump is at low water temperature, the compressor exhaust superheat is too low, and there is a risk that the lubricating oil on the exhaust side will be diluted by the refrigerant. In this case, the compressor will wear abnormally during long-term operation; this problem is more serious when the variable frequency compressor is operated at low frequency. Utility Model Content

[0003] Based on this, the purpose of the utility model is to provide a dual-circuit economizer, which increases the return air temperature and the return air superheat by adding a heat recovery circuit channel to the traditional economizer, thereby achieving the purpose of increasing the exhaust temperature, thereby solving the problem of the compressor lubricating oil being diluted by the refrigerant; at the same time, the refrigerant in the main channel can be doubly cooled to increase the amount of refrigerant liquid.

[0004] Another object of the utility model is to provide an air conditioner, which adopts a dual-circuit economizer in which the enthalpy increase circuit channel and the heat recovery circuit channel are integrated into one, so as to realize the functions of enthalpy increase air replenishment and return air heating, improve the reliability of low-frequency operation and low water temperature operation of the air conditioner, and also increase the cooling capacity and heating capacity of the unit, thereby improving the energy efficiency of the air conditioner; at the same time, it also saves space and saves costs.

[0005] A double-circuit economizer, comprising:

[0006] A main channel is used to connect the indoor heat exchanger and the outdoor heat exchanger;

[0007] An enthalpy increase circuit channel, whose refrigerant outlet is conductively connected to the enthalpy increase port of the compressor, and is used to introduce the refrigerant into the enthalpy increase port of the compressor;

[0008] A heat recovery loop channel, whose refrigerant outlet is conductively connected to the return air port of the compressor, and is used to guide the refrigerant into the return air port of the compressor;

[0009] In the working state, the enthalpy increase loop channel and the heat recovery loop channel exchange heat with the main channel at the same time; or, the heat recovery loop channel exchanges heat with the main channel alone.

[0010] Further, the heat exchange part of the enthalpy increase circuit channel is set as b enthalpy increase branches;

[0011] The heat exchange part of the heat recovery loop channel is configured as c heat recovery branches;

[0012] The heat exchange part of the main channel is set as a main branch;

[0013] The main branch is arranged adjacent to the enthalpy increase branch and / or the heat recovery branch, wherein b≥1, c≥1, a≥2; a=b+c, c≥b.

[0014] Furthermore, the dual-circuit economizer further includes: a three-way valve, which is respectively connected to the main channel, the enthalpy increase circuit channel and the outdoor heat exchanger.

[0015] Furthermore, the dual-circuit economizer also includes: an enthalpy-increasing throttling device, which is arranged between the three-way valve and the refrigerant inlet of the enthalpy-increasing circuit channel and is used to throttle the refrigerant entering the enthalpy-increasing circuit channel.

[0016] Furthermore, the enthalpy increase circuit channel is provided with a third interface and a fourth interface for importing and exporting refrigerant into and out of the enthalpy increase circuit channel; the heat recovery circuit channel is provided with a fifth interface and a sixth interface for importing and exporting refrigerant into and out of the heat recovery circuit channel.

[0017] Furthermore, the main channel is provided with a first interface and a second interface for the refrigerant to pass through the main channel; in the heating mode, the first interface is the refrigerant inlet of the main channel, and the second interface is the refrigerant outlet of the main channel. A part of the refrigerant flowing out through the second interface enters the enthalpy increase circuit channel and flows toward the enthalpy increase port of the compressor, and the other part flows toward the return air port of the compressor after passing through the outdoor heat exchanger and the heat recovery circuit channel.

[0018] Furthermore, the main channel is provided with a first interface and a second interface for the refrigerant to pass through the main channel; in the cooling mode, the second interface is the refrigerant inlet of the main channel, and the first interface is the refrigerant outlet of the main channel. The refrigerant flowing out through the first interface flows through the indoor heat exchanger and the heat recovery circuit channel and then flows to the return air port of the compressor.

[0019] Furthermore, an air conditioner comprises:

[0020] Indoor heat exchanger and outdoor heat exchanger;

[0021] A compressor is provided with an exhaust port, an enthalpy increase port and an air return port;

[0022] The dual-circuit economizer has the main channel disposed between the indoor heat exchanger and the outdoor heat exchanger, the enthalpy increase circuit channel being conductively connected to the enthalpy increase port, and the heat recovery circuit channel being conductively connected to the return air port.

[0023] Furthermore, the air conditioner also includes: a four-way valve, which is respectively connected to the exhaust port, the indoor heat exchanger, the outdoor heat exchanger, and the refrigerant inlet of the heat recovery loop channel.

[0024] Furthermore, the air conditioner also includes: a main circuit throttling device, which is arranged between the dual-circuit economizer and the outdoor heat exchanger.

[0025] The beneficial effects of the utility model are:

[0026] (1) By adding a heat recovery circuit channel to the traditional economizer, the return air temperature and return air superheat are increased, thereby achieving the purpose of increasing the exhaust temperature, thereby solving the problem of compressor lubricating oil being diluted by refrigerant and improving the reliability of low-frequency operation and low water temperature operation of the air conditioner;

[0027] (2) By integrating the enthalpy increase loop channel and the heat recovery loop channel with the main channel into a dual-circuit economizer, the refrigerant in the main channel can be double-cooled, increasing the amount of refrigerant liquid, thereby increasing the cooling capacity or heating capacity of the air conditioner and improving the energy efficiency of the air conditioner;

[0028] (3) The integrated dual-circuit economizer can realize multiple functions such as enthalpy increase, air replenishment and return air heating, and also simplifies the structure of the air conditioner, saving space and cost.

[0029] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a double-circuit economizer provided in an embodiment of the present application;

[0031] Figure 2 A refrigerant flow diagram of an air conditioner in heating condition provided in an embodiment of the present application;

[0032] Figure 3 A refrigerant flow diagram of an air conditioner under refrigeration conditions provided in an embodiment of the present application;

[0033] Figure 4 Schematic diagram of the internal branch implementation method of the double-circuit economizer Figure 1 ;

[0034] Figure 5 Schematic diagram of the internal branch implementation method of the double-circuit economizer Figure 2 .

[0035] In the figure: A-main channel; B-enthalpy increase loop channel; C-heat recovery loop channel; 10-compressor; 11-exhaust port; 12-return air port; 13-enthalpy increase port; 20-four-way valve; 30-indoor heat exchanger; 40-dual-circuit economizer; 41-first interface; 42-second interface; 43-third interface; 44-fourth interface; 45-fifth interface; 46-sixth interface; 47-enthalpy increase throttling device; 48-three-way valve; 50-main throttling device; 60-outdoor heat exchanger; 70-gas-liquid separator. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the present invention, it should be noted that the terms "vertical direction", "upper", "lower", "horizontal" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Existing heat pump systems are equipped with an enthalpy-increasing air supply circuit to supply air to the compressor in order to overcome the problem of poor heat exchange capacity when the ambient temperature is low. However, for refrigerants with a low adiabatic index and relatively low exhaust temperature, the exhaust superheat of the heat pump is too low when the water temperature is low. There is a risk that the lubricating oil on the exhaust side of the compressor will be diluted by the refrigerant, and the compressor will suffer abnormal wear during long-term operation. This problem is particularly serious when the variable frequency compressor is operated at a low frequency.

[0040] Based on this, the embodiment of the present application provides a dual-circuit economizer and an air conditioner including the dual-circuit economizer. The dual-circuit economizer provides an enthalpy increase circuit channel and a heat recovery circuit channel at the same time, replenishes air to increase enthalpy, and superheats the return air. By increasing the return air temperature and the return air superheat of the system, the exhaust temperature of the compressor is increased, thereby achieving the purpose of reducing the dilution degree of the compressor lubricating oil by the refrigerant.

[0041] See also Figure 1-3 , a dual-circuit economizer provided in an embodiment of the present application includes but is not limited to a main channel A, an enthalpy increase circuit channel B and a heat recovery circuit channel C for circulating refrigerant; wherein the enthalpy increase circuit channel B and the heat recovery circuit channel C can simultaneously perform heat exchange with the main channel A. The main channel A is used to connect the indoor heat exchanger 30 and the outdoor heat exchanger 60; the enthalpy increase circuit channel B, whose refrigerant outlet is conductively connected to the enthalpy increase port 13 of the compressor 10, is used to introduce the refrigerant into the enthalpy increase port 13 of the compressor 10; the heat recovery circuit channel C, whose refrigerant outlet is conductively connected to the return air port 12 of the compressor 10, is used to introduce the refrigerant into the return air port 12 of the compressor 10.

[0042] Specifically, under the heating condition, the refrigerant passes through the enthalpy increase loop channel B and undergoes heat exchange with the refrigerant in the main channel A to become a gaseous refrigerant, which flows into the enthalpy increase port 13 of the compressor 10 to replenish the compressor 10, and the refrigerant in the main channel A releases a certain amount of heat; at the same time, the gaseous refrigerant flowing through the heat recovery loop channel C simultaneously exchanges heat with the refrigerant in the main channel A, and the refrigerant in the main channel A further releases heat, while the gaseous refrigerant in the heat recovery loop channel C absorbs the heat of the liquid refrigerant in the main channel A, and after the temperature rises, it flows into the return air port 12 of the compressor 10, which increases the return air superheat, thereby increasing the exhaust temperature of the compressor 10. The liquid refrigerant in the main channel A simultaneously exchanges heat with the gaseous refrigerants in the enthalpy increase loop channel B and the heat recovery loop channel C, and the supercooling degree increases, which can effectively increase the cooling capacity and heating capacity of the air conditioner, thereby improving the energy efficiency of the air conditioner.

[0043] It is understandable that under refrigeration conditions, the enthalpy increase circuit channel B does not work, the gaseous refrigerant flowing through the heat recovery circuit channel C exchanges heat with the refrigerant in the main channel A, and after the return air temperature increases, it flows into the return air port 12 of the compressor 10.

[0044] See also Figure 4 and Figure 5It should be noted that the heat exchange part of the enthalpy increase loop channel B is divided into b enthalpy increase branches, b≥1; the heat exchange part of the heat recovery loop channel C is divided into c heat recovery branches, c≥1; the heat exchange part of the main channel A is also divided into a main branch, a≥2. It can be understood that the main branch is arranged adjacent to the enthalpy increase branch and / or the heat recovery branch, so that the enthalpy increase branch and the heat recovery branch can exchange heat with the main branch. The number of main branches is the sum of the number of enthalpy increase branches and the heat recovery branch, that is, a=b+c. In some embodiments, based on the fact that the amount of refrigerant in the heat recovery loop channel C is usually greater than the amount of refrigerant in the enthalpy increase loop channel B, the number of heat recovery branches is greater than the number of enthalpy increase branches, that is, c>b, which means that the proportion of the number of branches set by the main channel A and the heat recovery loop channel C is greater than the proportion of the number of branches set by the main channel A and the enthalpy increase loop channel B. In some specific implementations, the number of heat recovery branches may also be equal to the number of enthalpy increase branches, that is, c=b.

[0045] At the same time, it should be noted that the heat exchange areas of the enthalpy increase loop channel B and the heat recovery loop channel C can be the same as or different from those of the main channel A, and this is not limited here. In addition, the flow directions of the refrigerants in the main channel A, the enthalpy increase loop channel B, and the heat recovery loop channel C can be the same or opposite, which does not affect the implementation of the technical solution of the present application.

[0046] In some embodiments, the dual-circuit economizer 40 further includes a three-way valve 48, which is respectively connected to the main channel A, the enthalpy increase circuit channel B and the outdoor heat exchanger 60. Under cooling conditions, the refrigerant condenses into liquid through the outdoor heat exchanger 60 and flows out, and flows into the main channel A through the three-way valve 48. Under heating conditions, the refrigerant flows out of the main channel A and is split through the three-way valve 48, with one part flowing into the enthalpy increase circuit channel B and the other part flowing into the outdoor heat exchanger 60 for evaporation.

[0047] Furthermore, in some embodiments, the dual-circuit economizer 40 is further provided with an enthalpy-increasing throttling device 47, which is provided between the three-way valve 48 and the refrigerant inlet of the enthalpy-increasing circuit channel B, and is used to throttle the refrigerant entering the enthalpy-increasing circuit channel B. Under heating conditions, the enthalpy-increasing throttling device 47 is opened, and the refrigerant flows through the enthalpy-increasing circuit channel B and exchanges heat with the main channel A to increase enthalpy and replenish air to the compressor; under cooling conditions, the enthalpy-increasing throttling device 47 is closed, and the refrigerant does not enter the enthalpy-increasing circuit channel B.

[0048] It is understandable that the enthalpy-increasing throttling device 47 may be an electronic expansion valve with a regulating function, which is used to control the amount of refrigerant entering the enthalpy-increasing circuit channel B and to release the high-pressure liquid refrigerant into a low-pressure gaseous refrigerant or a gas-liquid mixed refrigerant. The enthalpy-increasing throttling device 47 is not specifically limited here.

[0049] Furthermore, the main channel A is provided with a first interface 41 and a second interface 42, which are provided on the outer wall of the dual-circuit economizer 40, and are used for the refrigerant to pass through the economizer through the main channel A. Under the heating condition, the first interface 41 is the refrigerant inlet of the main channel A, and the second interface 42 is the refrigerant outlet of the main channel A. The high-temperature and high-pressure liquid refrigerant condensed through the indoor heat exchanger 30 enters the economizer through the first interface 41, and after heat exchange, flows out of the dual-circuit economizer 40 through the second interface 42, and then is split through the three-way valve 48, one part enters the enthalpy increase circuit channel B and the main channel A for heat exchange, and the other part enters the outdoor heat exchanger 60 for evaporation. Under the cooling condition, the second interface 42 is the refrigerant inlet of the main channel A, and the first interface 41 is the refrigerant outlet of the main channel A. The high-temperature and high-pressure liquid refrigerant condensed through the outdoor heat exchanger 60 enters the economizer through the second interface 42, and after heat exchange, flows out of the economizer through the first interface 41.

[0050] Furthermore, the enthalpy increase circuit channel B is provided with a third interface 43 and a fourth interface 44, which are provided on the outer wall of the dual-circuit economizer 40, and are used for the refrigerant to pass through the economizer through the enthalpy increase circuit channel B. The third interface 43 is connected to the enthalpy increase throttling device 47 as the refrigerant inlet of the enthalpy increase circuit channel B, and the fourth interface 44 is connected to the enthalpy increase port 13 of the compressor 10 as the refrigerant outlet of the enthalpy increase circuit channel B.

[0051] Furthermore, the heat recovery circuit channel C is provided with a fifth interface 45 and a sixth interface 46, which are provided on the outer wall of the dual-circuit economizer 40 and are used for the refrigerant to pass through the economizer through the heat recovery circuit channel C. The fifth interface 45 is connected to the indoor heat exchanger 30 or the outdoor heat exchanger 60 as the refrigerant inlet of the heat recovery circuit channel C, and the sixth interface 46 is connected to the return air port 12 of the compressor 10 as the refrigerant outlet of the heat recovery circuit channel C. After the gaseous refrigerant evaporated through the indoor heat exchanger 30 or the outdoor heat exchanger 60 enters the heat recovery circuit channel C through the fifth interface 45 to exchange heat with the refrigerant in the main channel A, the return air temperature is increased and enters the compressor 10.

[0052] Compared with the traditional economizer, the dual-circuit economizer 40 provided in the embodiment of the present application can increase the enthalpy and replenish the air for the compressor 10, and can also increase the return air temperature, thereby increasing the return air superheat of the system, and then increasing the exhaust temperature of the compressor 10. In this way, the degree of dilution of the lubricating oil of the compressor 10 by the refrigerant can be greatly reduced, and the safety and stability of the operation of the unit can be improved. In addition, while the dual-circuit economizer 40 absorbs the heat of the refrigerant in the main channel A through the heat recovery circuit channel C to increase the return air temperature and the return air superheat, the refrigerant in the heat recovery circuit channel C and the refrigerant in the enthalpy increase circuit channel B jointly perform double cooling on the refrigerant flowing through the main channel A, so that the amount of liquid refrigerant entering the indoor heat exchanger 30 or the outdoor heat exchanger 60 for evaporation is increased, thereby increasing the cooling capacity or heating capacity of the unit and improving the energy efficiency of the unit.

[0053] See also Figure 1-3 The embodiment of the present application also provides an air conditioner, including an indoor heat exchanger 30, an outdoor heat exchanger 60, a compressor 10 and a dual-circuit economizer 40. The indoor heat exchanger 30, the outdoor heat exchanger 60, the compressor 10 and the dual-circuit economizer 40 together constitute a refrigerant circulation circuit. The compressor 10 is provided with an exhaust port 11, an enthalpy increase port 13 and a return air port 12. The dual-circuit economizer 40 is arranged between the indoor heat exchanger 30 and the outdoor heat exchanger 60, and is conductively connected to the indoor heat exchanger 30 through a first interface 41, and is conductively connected to the outdoor heat exchanger 60 through a second interface 42; the third interface 43 is conductively connected to the outdoor heat exchanger 60, and the fourth interface 44 is conductively connected to the enthalpy increase port 13 of the compressor 10; the fifth interface 45 is connected to the indoor heat exchanger 30 or the outdoor heat exchanger 60, and the sixth interface 46 is connected to the return air port 12 of the compressor 10.

[0054] Furthermore, the air conditioner is also provided with a four-way valve 20, which is respectively connected to the exhaust port 11 of the compressor 10, the indoor heat exchanger 30, the outdoor heat exchanger 60, and the dual-circuit economizer 40. Under the heating condition, the four-way valve 20 conducts the exhaust port 11 and the indoor heat exchanger 30, and conducts the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 to the indoor heat exchanger 30; at the same time, it conducts the outdoor heat exchanger 60 and the fifth interface 45, and conducts the low-temperature and low-pressure gaseous refrigerant evaporated through the outdoor heat exchanger 60 to the fifth interface 45 to enter the heat recovery circuit channel C, so as to heat the return air refrigerant. Under refrigeration conditions, the four-way valve 20 connects the exhaust port 11 and the outdoor heat exchanger 60, and the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 is connected to the outdoor heat exchanger 60; at the same time, the indoor heat exchanger 30 and the fifth interface 45 are connected, and the low-temperature and low-pressure gaseous refrigerant evaporated through the indoor heat exchanger 30 is connected to the fifth interface 45 to enter the heat recovery circuit channel C, so as to heat the return air refrigerant.

[0055] Furthermore, the air conditioner is also provided with a main throttling device 50, which is arranged between the three-way valve 48 and the outdoor heat exchanger 60. Similar to the enthalpy increase throttling device 47, the main throttling device 50 can be an electronic expansion valve with a regulating function, which is used to control the amount of refrigerant flowing into or out of the main channel A. The main throttling device 50 is not specifically limited here.

[0056] In some embodiments, the air conditioner is further provided with a gas-liquid separator 70, which is arranged between the dual-circuit economizer 40 and the return air port 12, and is used to remove liquid from the return air returning to the compressor 10 to avoid liquid hammer or dilution of the lubricating oil by the refrigerant liquid.

[0057] See also Figure 2 Under heating conditions, high-temperature and high-pressure gaseous refrigerant is discharged through the exhaust port 11 and guided to the indoor heat exchanger 30 through the four-way valve 20. At this time, the indoor heat exchanger 30 acts as a condenser to supply heat to the indoor room, and at the same time condenses the high-temperature and high-pressure gaseous refrigerant into high-temperature and high-pressure liquid refrigerant, which enters the main path channel A through the first interface 41, and then is diverted through the three-way valve 48. One part is depressurized through the enthalpy increase throttling device 47 and enters the enthalpy increase loop channel B through the third interface 43, and the other part is depressurized through the main path throttling device 50 and enters the outdoor heat exchanger 60. At this time, the outdoor heat exchanger 60 acts as an evaporator to evaporate the high-temperature and high-pressure liquid refrigerant that has been partially depressurized through the main path throttling device 50 to form a low-temperature and low-pressure gaseous refrigerant, which is then conducted to the dual-circuit economizer 40 by the four-way valve 20 and enters the heat recovery loop channel C through the fifth interface 45. At this time, the gaseous refrigerant in the heat recovery loop channel C and the gaseous refrigerant in the enthalpy increase loop channel B simultaneously exchange heat with the liquid refrigerant in the main channel A, so that the liquid refrigerant in the main channel A is supercooled, the amount of liquid increases, and the supercooling degree of the air conditioner is increased; at the same time, the temperature of the gaseous refrigerant in the heat recovery loop channel C and the enthalpy increase loop channel B increases, and flows into the compressor 10, thereby increasing the superheat of the return air, thereby increasing the exhaust temperature of the compressor 10.

[0058] See also Figure 3In the cooling condition, the enthalpy increase throttling device 47 is closed, and the high-temperature and high-pressure gaseous refrigerant is discharged through the exhaust port 11 and guided to the outdoor heat exchanger 60 through the four-way valve 20. At this time, the outdoor heat exchanger 60 acts as a condenser, releases heat, and condenses the high-temperature and high-pressure gaseous refrigerant into a high-temperature and high-pressure liquid refrigerant, which then flows through the main throttling device 50 for flow adjustment, and then enters the main channel A through the second interface 42. The high-temperature and high-pressure liquid refrigerant in the main channel A flows out of the dual-circuit economizer 40 through the first interface 41, and then enters the indoor heat exchanger 30, absorbs indoor heat, and cools the room; at the same time, the high-temperature and high-pressure liquid refrigerant evaporates to form a low-temperature and low-pressure gaseous refrigerant, which is then conducted to the dual-circuit economizer 40 by the four-way valve 20, and enters the heat recovery circuit channel C through the fifth interface 45. At this time, the gaseous refrigerant in the heat recovery circuit channel C exchanges heat with the liquid refrigerant in the main channel A.

[0059] It can be seen that in the technical solution of the embodiment of the present application, the dual-circuit economizer in which the enthalpy increase circuit channel and the heat recovery circuit channel are integrated into one can not only realize the basic functions of enthalpy increase air replenishment and return air heating, which is used to increase the return air temperature of the compressor and increase the return air superheat to increase the exhaust temperature to overcome the problem of the compressor lubricating oil being diluted by the refrigerant, but also increase the cooling capacity and heating capacity of the unit, while saving space and cost.

[0060] Compared with the prior art, the beneficial effects of the technical solution of this application are:

[0061] (1) By adding a heat recovery circuit channel to the traditional economizer, the return air temperature and return air superheat are increased, thereby achieving the purpose of increasing the exhaust temperature, thereby solving the problem of compressor lubricating oil being diluted by refrigerant and improving the reliability of low-frequency operation and low water temperature operation of the air conditioner;

[0062] (2) By integrating the enthalpy increase loop channel and the heat recovery loop channel with the main channel into a dual-circuit economizer, the refrigerant in the main channel can be double-cooled, increasing the amount of refrigerant liquid, thereby increasing the cooling capacity or heating capacity of the air conditioner and improving the energy efficiency of the air conditioner;

[0063] (3) The integrated dual-circuit economizer can realize multiple functions such as enthalpy increase, air replenishment and return air heating, and also simplifies the structure of the air conditioner, saving space and cost.

[0064] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and the utility model is also intended to include these modifications and modifications.

Claims

1. A double-circuit economizer, characterized in that: include: A main channel is used to connect the indoor heat exchanger and the outdoor heat exchanger; An enthalpy increase circuit channel, whose refrigerant outlet is conductively connected to the enthalpy increase port of the compressor, and is used to introduce the refrigerant into the enthalpy increase port of the compressor; A heat recovery circuit channel, whose refrigerant outlet is connected to the return air port of the compressor, and is used to guide the refrigerant into the return air port of the compressor; In the working state, the enthalpy increase loop channel and the heat recovery loop channel exchange heat with the main channel at the same time; or, the heat recovery loop channel exchanges heat with the main channel alone.

2. A double-circuit economizer according to claim 1, characterized in that: The heat exchange part of the enthalpy increase circuit channel is set as b enthalpy increase branches; The heat exchange part of the heat recovery loop channel is configured as c heat recovery branches; The heat exchange part of the main channel is set as a main branch; The main branch is arranged adjacent to the enthalpy increase branch and / or the heat recovery branch, wherein b≥1, c≥1, a≥2; a=b+c, c≥b.

3. A double-circuit economizer according to claim 1, characterized in that: Also includes: A three-way valve, wherein three channels are respectively connected to the main channel, the enthalpy increase loop channel and the outdoor heat exchanger.

4. A double-circuit economizer according to claim 3, characterized in that: Also includes: The enthalpy-increasing throttling device is arranged between the three-way valve and the refrigerant inlet of the enthalpy-increasing circuit channel, and is used for throttling the refrigerant entering the enthalpy-increasing circuit channel.

5. A double-circuit economizer according to claim 4, characterized in that: The enthalpy increase circuit channel is provided with a third interface and a fourth interface for introducing and exporting refrigerant into and out of the enthalpy increase circuit channel; The heat recovery loop channel is provided with a fifth interface and a sixth interface for introducing and exporting refrigerant into and out of the heat recovery loop channel.

6. A double-circuit economizer according to claim 5, characterized in that: The main channel is provided with a first interface and a second interface for the refrigerant to pass through the main channel; in the heating mode, the first interface is the refrigerant inlet of the main channel, and the second interface is the refrigerant outlet of the main channel. A part of the refrigerant flowing out through the second interface enters the enthalpy increase circuit channel and flows to the enthalpy increase port of the compressor, and the other part flows to the return air port of the compressor after passing through the outdoor heat exchanger and the heat recovery circuit channel.

7. A double-circuit economizer according to claim 5, characterized in that: The main channel is provided with a first interface and a second interface for the refrigerant to pass through the main channel; in the cooling mode, the second interface is the refrigerant inlet of the main channel, and the first interface is the refrigerant outlet of the main channel. The refrigerant flowing out through the first interface flows through the indoor heat exchanger and the heat recovery circuit channel and then flows to the return air port of the compressor.

8. An air conditioner, characterized in that: include: Indoor heat exchanger and outdoor heat exchanger; A compressor is provided with an exhaust port, an enthalpy increase port and an air return port; And the dual-circuit economizer described in any one of claims 1-7, wherein the main channel is arranged between the indoor heat exchanger and the outdoor heat exchanger, the enthalpy increase circuit channel is conductively connected to the enthalpy increase port, and the heat recovery circuit channel is conductively connected to the return air port.

9. An air conditioner according to claim 8, characterized in that: Also includes: The four-way valve is respectively connected to the exhaust port, the indoor heat exchanger, the outdoor heat exchanger, and the refrigerant inlet of the heat recovery loop channel.

10. An air conditioner according to claim 9, characterized in that: Also includes: The main circuit throttling device is arranged between the dual circuit economizer and the outdoor heat exchanger.

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