Heat exchanger, control method, air conditioner and storage medium

Abstract

The invention discloses a heat exchanger, a control method, an air conditioner and a storage medium, the heat exchanger comprises a heating working medium inlet part, a heating working medium outlet part, a supercooling branch and at least one heat exchange branch, the supercooling branch communicates with the heating working medium inlet part, and the heat exchange branch communicates between the heating working medium outlet part and the supercooling branch; at least one first throttling element is arranged on each heat exchange branch, and the first throttling elements are used for throttling working media passing through the heat exchange branches; while the supercooling branches and the heat exchange branches are adopted for graded heat exchange, at least one first throttling piece is arranged on each heat exchange branch to throttle the working medium in the heat exchange branches, so that the temperature slippage phenomenon of the non-azeotropic refrigerant in the heat exchanger is inhibited, the non-azeotropic refrigerant in the heat exchanger is kept at 0 DEG C or above as much as possible, and the heat exchange efficiency is improved. The heat exchanger is prevented from frosting and icing, and the working efficiency of the heat exchanger is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner equipment, and in particular to a heat exchanger, a control method, an air conditioner and a storage medium. Background Art

[0002] A non-azeotropic refrigerant refers to a refrigerant composed of a mixture of two or more substances. Due to the different boiling points of its components, one component evaporates first and the other evaporates later during evaporation, and the opposite is true during condensation, resulting in a temperature change during a constant-pressure phase change, which is the temperature slip phenomenon that occurs when the non-azeotropic refrigerant evaporates or condenses. When the air conditioner is in heating mode, due to the temperature slip phenomenon, there will be a large temperature difference between the working fluid inlet and the working fluid outlet of the outdoor heat exchanger, that is, the temperature of the working fluid inlet is lower and the temperature of the working fluid outlet is higher, which makes it easy for frost and ice to form at the working fluid inlet, resulting in a decrease in the working efficiency of the outdoor heat exchanger. Summary of the invention

[0003] The main purpose of the embodiments of the present invention is to provide a heat exchanger, a control method, an air conditioner and a storage medium, aiming to improve the technical problem in the prior art that the outdoor heat exchanger is frosted and frozen due to the temperature glide phenomenon of the non-azeotropic refrigerant.

[0004] An embodiment of the present invention provides a heat exchanger, comprising:

[0005] Heating medium inlet;

[0006] Heating medium outlet;

[0007] A supercooling branch, the supercooling branch being in communication with the heating medium inlet;

[0008] At least one heat exchange branch, the heat exchange branch being connected between the heating medium outlet and the supercooling branch;

[0009] Wherein, at least a first throttling component is provided on each of the heat exchange branches, and the first throttling component is used to throttle the working medium passing through the heat exchange branch.

[0010] In some embodiments of the present invention, the heat exchanger has a plurality of the heat exchange branches, and the plurality of the heat exchange branches are connected in parallel between the heating medium outlet and the supercooling branch.

[0011] In some embodiments of the present invention, a second throttling member is provided on the subcooling branch, and the second throttling member is used to throttle the working medium passing through the subcooling branch.

[0012] In some embodiments of the present invention, the present invention further provides a control method for controlling an air conditioner, the air conditioner adopts a non-azeotropic refrigerant, the air conditioner comprises a heat exchanger and a first expansion valve connected to the heat exchanger, the first expansion valve is also connected to the indoor heat exchanger of the air conditioner, the heat exchanger comprises a heating medium inlet, a heating medium outlet, a subcooling branch and a plurality of heat exchange branches, the subcooling branch is connected to the heating medium inlet, a second expansion valve is arranged on the subcooling branch, a plurality of the heat exchange branches are connected in parallel between the heating medium outlet and the subcooling branch, each of the heat exchange branches is provided with at least a first throttling member, the first expansion valve is connected to the heating medium inlet, and the control method further comprises:

[0013] When the air conditioner is started in heating mode and the outdoor temperature is lower than a preset temperature, adjusting the opening of the first expansion valve and the opening of the second expansion valve according to the exhaust temperature of the air conditioner and the running time of the air conditioner;

[0014] When it is determined that the operating time is less than the preset time and the exhaust temperature is not within the preset exhaust temperature range, controlling the first expansion valve to be adjusted to a first initial opening degree and the second expansion valve to be adjusted to a second initial opening degree;

[0015] When it is determined that the operating time is greater than or equal to the preset time or the exhaust temperature is within the preset exhaust temperature range, the opening of the first expansion valve is adjusted according to the outdoor heat exchanger coil temperature, and the opening of the second expansion valve is adjusted according to the opening of the first expansion valve.

[0016] In some embodiments of the present invention, after the second expansion valve operates at the second initial opening for a target time, wherein the target time is less than the preset time, the control method further includes:

[0017] The opening degree of the second expansion valve is adjusted according to the suction superheat degree or the exhaust superheat degree of the compressor of the air conditioner.

[0018] In some embodiments of the present invention, before controlling the first expansion valve to be adjusted to the first initial opening degree and the second expansion valve to be adjusted to the second initial opening degree, the control method further includes:

[0019] determining the second initial opening degree according to the outdoor temperature;

[0020] The first initial opening degree is determined according to the outdoor temperature and the second initial opening degree.

[0021] In some embodiments of the present invention, determining the second initial opening degree according to the outdoor temperature includes:

[0022] Determine a temperature range corresponding to the outdoor temperature;

[0023] The second initial opening degree is determined according to the temperature range.

[0024] In some embodiments of the present invention, determining the first initial opening degree according to the outdoor temperature and the second initial opening degree includes:

[0025] Determining a basic opening degree of the first expansion valve according to the outdoor temperature;

[0026] determining a compensation opening of the first expansion valve according to the second initial opening;

[0027] The first initial opening is determined according to the compensation opening and the basic opening.

[0028] In some embodiments of the present invention, an air conditioner is also provided, which includes a memory, a processor, a heat exchanger and a first expansion valve connected to the heat exchanger, the first expansion valve is also connected to the indoor heat exchanger of the air conditioner, the heat exchanger includes a heating medium inlet, a heating medium outlet, a subcooling branch and a plurality of heat exchange branches, the subcooling branch is connected to the heating medium inlet, a second expansion valve is arranged on the subcooling branch, a plurality of the heat exchange branches are connected in parallel between the heating medium outlet and the subcooling branch, each of the heat exchange branches is provided with at least a first throttling device, the first expansion valve is connected to the heating medium inlet, the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in the above-mentioned control method.

[0029] In some embodiments of the present invention, a storage medium is further provided, wherein the storage medium stores a computer program, and the computer program is loaded and executed by a processor to execute the steps in the above control method.

[0030] An embodiment of the present invention provides a heat exchanger, a control method, an air conditioner and a storage medium, wherein the heat exchanger adopts a supercooling branch and a heat exchange branch to perform graded heat exchange, and at least one first throttling device is arranged on the heat exchange branch to throttle the working fluid in the heat exchange branch, thereby suppressing the temperature slip phenomenon of the non-azeotropic refrigerant in the heat exchanger, so that the non-azeotropic refrigerant in the heat exchanger is kept above 0°C as much as possible to avoid frosting and icing of the heat exchanger and ensure the working efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 A working medium flow diagram in a heat exchanger in a heating mode according to an embodiment of the present invention;

[0033] Figure 2 A working medium flow diagram in a heat exchanger under a heating module according to another embodiment of the present invention;

[0034] Figure 3 The pressure-enthalpy diagram of the non-azeotropic working fluid in the heat exchanger without a throttling device and with a throttling device;

[0035] Figure 4 A schematic flow chart of a control method according to an embodiment of the present invention;

[0036] Figure 5 The figure is a schematic structural diagram of an air conditioner according to the present invention.

[0037] Figure numerals: 100, first expansion valve; 201, heating medium inlet; 202, heating medium outlet; 210, subcooling branch; 211, second throttling element; 220, heat exchange branch; 221, first throttling element; 601, processor; 602, memory; 603, power supply; 604, input unit. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] like Figure 1-Figure 3 As shown, the present invention provides a heat exchanger, which includes a heating medium inlet 201, a heating medium outlet 202, a subcooling branch 210 and at least one heat exchange branch 220. The subcooling branch 210 is connected to the heating medium inlet 201. The heat exchange branch 220 is connected between the heating medium outlet 202 and the subcooling branch 210. At least one first throttling member 221 is provided on each heat exchange branch 220, and the first throttling member 221 is used to throttle the medium passing through the heat exchange branch 220.

[0043] Among them, the heating medium inlet part 201, that is, in the heating mode, the non-azeotropic refrigerant flows into the heat exchanger from the heating medium inlet part 201 and enters the subcooling branch 210; the heating medium outlet part 202, that is, in the heating mode, the non-azeotropic refrigerant flows out of the heat exchanger from the heating medium outlet part 202.

[0044] The subcooling branch 210 is a heat exchange tube in the heat exchanger, and the working medium flows into the subcooling branch 210 from the heating working medium inlet 201, and performs a primary heat exchange in the subcooling branch 210.

[0045] Among them, the heat exchange branch 220 is a heat exchange tube in the heat exchanger connected to the subcooling branch 210. After the working fluid undergoes primary heat exchange in the subcooling branch 210, it is diverted and flows into the heat exchange branch 220 for secondary heat exchange. Since the heat exchange branch 220 is provided with a first throttling device 221, the first throttling device 221 can throttle the working fluid in the heat exchange branch 220, thereby suppressing the temperature slip phenomenon of the non-azeotropic working fluid in the heat exchange branch 220, and further maintaining the working fluid temperature in the heat exchanger above 0°C as much as possible.

[0046] It can be understood that, while the heat exchanger adopts the subcooling branch 210 and the heat exchange branch 220 for staged heat exchange, at least a first throttling device 221 is provided on each heat exchange branch 220 to throttle the working fluid in the heat exchange branch 220, thereby suppressing the temperature slip phenomenon of the non-azeotropic refrigerant in the heat exchanger, so that the non-azeotropic refrigerant in the heat exchanger is kept above 0°C as much as possible, so as to avoid frost and ice on the heat exchanger and ensure the working efficiency of the heat exchanger.

[0047] In some embodiments, when the heat exchanger has a plurality of heat exchange branches 220 , the plurality of heat exchange branches 220 are connected in parallel between the heating medium outlet 202 and the supercooling branch 210 .

[0048] That is, the non-azeotropic refrigerant passing through the subcooling branch 210 is branched into multiple heat exchange branches 220 at the outlet of the subcooling branch 210, and then the multiple heat exchange branches 220 merge at the inlet end of the heating medium outlet part 202 to enter the heating medium outlet part 202, and finally flow out from the heating medium outlet part 202.

[0049] Since the first throttling element is provided on the heat exchange branch 220, the non-azeotropic refrigerant can be throttled in each heat exchange branch 220, so that the non-azeotropic refrigerant in each heat exchange branch 220 can be kept above 0°C.

[0050] In some embodiments, when a plurality of first throttling elements 221 are disposed on a heat exchange branch 220 , the plurality of first throttling elements 221 can perform multi-stage throttling on the working medium in the heat exchange branch 220 for multiple times.

[0051] That is, a heat exchange tube is provided with a plurality of first throttling members 221, which can perform multi-stage throttling on the non-azeotropic refrigerant, thereby keeping the temperature of the non-azeotropic refrigerant in the heat exchanger above 0°C. Compared with single-stage throttling (only one first throttling member 221 is provided), the temperature of the non-azeotropic refrigerant can be better maintained above 0°C.

[0052] In some embodiments, the first throttling element 221 may be any one of a capillary tube, a throttling short tube, and an expansion valve.

[0053] In other embodiments, the first throttling member 221 may also be a small-diameter "U"-shaped tube, with a diameter less than 5 mm.

[0054] In some embodiments, the heat exchange branch 220 includes multiple first throttling members 221 and multiple heat exchange pipe segments, and every two adjacent heat exchange pipe segments are connected by a first throttling member 221. Since the heat exchange branch 220 has multiple first throttling members 221, it can perform multi-stage throttling on the non-azeotropic refrigerant, thereby keeping the temperature of the non-azeotropic refrigerant in the heat exchanger above 0°C.

[0055] according to Figure 3 It can be seen that by setting the throttling device, the temperature of the non-azeotropic working fluid in the heat exchanger can be maintained above 0°C.

[0056] In some embodiments, a second throttling member 211 is provided on the supercooling branch 210 , and the second throttling member 211 is used to throttle the working medium passing through the supercooling branch 210 .

[0057] It can be understood that when the second throttling device 211 is provided on the subcooling branch 210, the heat exchanger not only realizes graded heat exchange, but also realizes multi-stage throttling, thereby suppressing the temperature slip phenomenon of the non-azeotropic refrigerant in the heat exchanger, and keeping the temperature of the non-azeotropic refrigerant in the heat exchanger above 0°C as much as possible, thereby avoiding frost and ice on the heat exchanger.

[0058] In some embodiments, the second throttling element 211 is an expansion valve or a throttling tube.

[0059] Among them, the second throttling device 211 is preferably an expansion valve. When the second throttling device 211 is an electronic expansion valve, the opening of the electronic expansion valve can be adjusted in real time according to the actual working conditions of the heat exchanger, thereby increasing the ability to adjust the working fluid temperature to ensure that the non-azeotropic working fluid temperature in the heat exchanger is above 0°C.

[0060] In some embodiments, Figure 4-Figure 5 As shown, the present invention provides a control method for controlling an air conditioner, the air conditioner adopts a non-azeotropic refrigerant, the air conditioner comprises a heat exchanger and a first expansion valve 100 connected to the heat exchanger, the first expansion valve 100 is also connected to the indoor heat exchanger of the air conditioner, the heat exchanger comprises a heating medium inlet 201, a heating medium outlet 202, a subcooling branch 210 and a plurality of heat exchange branches 220, the subcooling branch 210 is connected to the heating medium inlet 201, a second expansion valve is arranged on the subcooling branch 210, a plurality of heat exchange branches 220 are connected in parallel between the heating medium outlet 202 and the subcooling branch 210, each heat exchange branch 220 is provided with at least a first throttling member 221, the first expansion valve 100 is connected to the heating medium inlet 201, the control method comprises:

[0061] S100, when the air conditioner is started in heating mode and the outdoor temperature is lower than a preset temperature, the opening of the first expansion valve 100 and the opening of the second expansion valve are adjusted according to the exhaust temperature of the air conditioner and the operation time of the air conditioner.

[0062] Among them, the preset temperature is generally 0°C.

[0063] The running time of the air conditioner is the running time from the last startup of the air conditioner to the current moment.

[0064] The exhaust temperature of the air conditioner is the exhaust temperature of the compressor of the air conditioner.

[0065] S200, when it is determined that the operating time is less than the preset time and the exhaust temperature is not within the preset exhaust temperature range, the first expansion valve 100 is controlled to be adjusted to the first initial opening degree and the second expansion valve is controlled to be adjusted to the second initial opening degree.

[0066] Among them, the preset exhaust temperature range is data pre-stored in the controller of the air conditioner, generally (target exhaust temperature -6°C, target exhaust temperature +6°C), where the target exhaust temperature is determined based on the outdoor ambient temperature and the operating conditions of the air conditioner.

[0067] Among them, the preset time is generally 10 minutes.

[0068] S300, when it is determined that the operating time is greater than or equal to the preset time or the exhaust temperature is within the preset exhaust temperature range, the opening of the first expansion valve 100 is adjusted according to the outdoor heat exchanger coil temperature, and the opening of the second expansion valve is adjusted according to the opening of the first expansion valve 100.

[0069] It can be understood that by adjusting the first expansion valve 100 and the second expansion valve, the temperature of the non-azeotropic refrigerant in the heat exchanger is adaptively adjusted to suppress the temperature slip phenomenon of the non-azeotropic refrigerant in the heat exchanger, so that the temperature of the non-azeotropic refrigerant in the heat exchanger is maintained above 0°C.

[0070] In some embodiments, after the second expansion valve operates at the second initial opening for a target time, wherein the target time is less than a preset time, the control method further includes:

[0071] S130, adjusting the opening of the second expansion valve according to the suction superheat or exhaust superheat of the compressor of the air conditioner.

[0072] Among them, the target time is generally determined according to the outdoor temperature, and the target time value range is 2min-5min. The lower the outdoor temperature, the larger the target time value, and the higher the outdoor temperature, the smaller the target time value.

[0073] It can be understood that by adjusting the opening of the second expansion valve according to the suction superheater or the exhaust gas superheat, the temperature of the non-azeotropic refrigerant in the heat exchanger can be more accurately adjusted to maintain it above 0°C.

[0074] In some embodiments, S130, adjusting the opening of the second expansion valve according to the suction superheat of the compressor of the air conditioner includes:

[0075] The suction superheat is determined based on the actual suction temperature and the target suction temperature.

[0076] The opening adjustment amount of the second expansion valve is determined according to the suction gas superheat.

[0077] After the second expansion valve operates at the second initial opening for a target time, the opening of the second expansion valve is adjusted based on the second initial opening according to the suction air superheat.

[0078] The actual suction temperature is T 实吸 , the target suction temperature is T 目吸 , then the suction superheat ΔT 吸 =T 实吸 -T 目吸 .

[0079] The specific method for determining the amount of change in the opening of the second expansion valve according to the suction superheat can be referred to the following table:

[0080] Suction superheat Opening adjustment <![CDATA[ΔT 吸 >4℃]]> +10 steps / second <![CDATA[1℃<ΔT 吸 ≤4℃]]> +5 steps / second <![CDATA[-1℃<ΔT 吸 ≤1℃]]> Keep it the same <![CDATA[-4℃<ΔT 吸 ≤-1℃]]> -5 steps / second <![CDATA[ΔT 吸 ≤-4℃]]> -10 steps / second

[0081] In some embodiments, S130, adjusting the opening of the second expansion valve according to the exhaust gas superheat of the compressor of the air conditioner, includes:

[0082] Determine the exhaust superheat based on the actual exhaust temperature and the target exhaust temperature.

[0083] The opening adjustment amount of the second expansion valve is determined according to the exhaust gas superheat.

[0084] After the second expansion valve operates at the second initial opening for a target time, the opening of the second expansion valve is adjusted based on the second initial opening according to the exhaust gas superheat.

[0085] The actual exhaust temperature is T 实排 , the target exhaust temperature is T 目排 , then the exhaust superheat ΔT 排 =T 实排 -T 目排 .

[0086] The specific method for determining the amount of change in the opening of the second expansion valve according to the exhaust gas superheat can be referred to the following table:

[0087] Exhaust superheat Opening adjustment <![CDATA[ΔT 排 >4℃]]> +10 steps / second <![CDATA[1℃<ΔT 排 ≤4℃]]> +5 steps / second <![CDATA[-1℃<ΔT 排 ≤1℃]]> Keep it the same <![CDATA[-4℃<ΔT 排 ≤-1℃]]> -5 steps / second <![CDATA[ΔT 排 ≤-4℃]]> -10 steps / second

[0088] In some embodiments, before controlling the first expansion valve 100 to be adjusted to the first initial opening degree and the second expansion valve to be adjusted to the second initial opening degree, the control method further includes:

[0089] S105, determining a second initial opening degree according to the outdoor temperature.

[0090] S106, determining a first initial opening degree according to the outdoor temperature and the second initial opening degree.

[0091] It is understandable that the outdoor temperature is an important factor affecting the frost and ice formation of the outdoor heat exchanger. Therefore, by adjusting the second initial opening of the second expansion valve according to the outdoor temperature, it is possible to ensure that the temperature of the non-azeotropic refrigerant in the heat exchanger will not be lower than 0°C by regulating the second expansion valve. At the same time, since the first expansion valve 100 and the second expansion valve cooperate with each other, it is necessary to determine the first initial opening according to the outdoor temperature and the second initial opening, thereby ensuring that the temperature of the non-azeotropic refrigerant in the heat exchanger will not be lower than 0°C.

[0092] In some embodiments, S105, determining a second initial opening degree according to the outdoor temperature includes:

[0093] Determine the temperature range that corresponds to the outdoor temperature.

[0094] The outdoor temperature is the outdoor temperature at the current moment.

[0095] The temperature range is a data parameter pre-stored in the controller, that is, a plurality of temperature ranges are pre-stored in the controller. When the outdoor temperature is determined, the temperature range in which it is located, that is, the temperature range, can be found according to the outdoor temperature.

[0096] The second initial opening degree is determined according to the temperature range.

[0097] The specific method for determining the second initial opening according to the temperature range can be referred to as shown in the following table:

[0098] Outdoor temperature range The second initial opening <![CDATA[T 室外 >A1]]> M1 <![CDATA[A2<T 室外 ≤A1]]> M2 <![CDATA[A3<T 室外 ≤A2]]> M3 <h2 style=";text-align:left;direction:ltr"><![CDATA[T <h2 style=";text-align:left;direction:ltr"> 室外 <h2 style=";text-align:left;direction:ltr"> <A3]]><h2 style=";text-align:left;direction:ltr"> M4

[0099] Among them, T 室外 is the outdoor temperature.

[0100] Among them, A1, A2, and A3 represent the outdoor ambient temperature, -25℃≤A3≤A2≤A1≤20℃.

[0101] Among them, M1, M2, M3, M4 represent the opening degree of the second expansion valve, the unit is Pu l se, 0P≤M4≤M3≤M2≤M1≤520P.

[0102] In some embodiments, S106, determining the first initial opening degree according to the outdoor temperature and the second initial opening degree includes:

[0103] The basic opening degree of the first expansion valve 100 is determined according to the outdoor temperature.

[0104] The basic opening is determined by the outdoor temperature, and the corresponding basic opening can be determined according to the temperature range of the outdoor temperature. The determination of the basic opening can be referred to the following table:

[0105] Outdoor temperature range Basic opening <![CDATA[T 室外 >A1]]> E1 <![CDATA[A2<T 室外 ≤A1]]> E2 <![CDATA[A3<T 室外 ≤A2]]> E3 <h2 style=";text-align:left;direction:ltr"><![CDATA[T <h2 style=";text-align:left;direction:ltr"> 室外 <h2 style=";text-align:left;direction:ltr"> <A3]]><h2 style=";text-align:left;direction:ltr"> E4

[0106] Among them, E1, E2, E3, and E4 represent the basic opening of the first expansion valve, with the unit of Pu l es, 0P≤E4≤E3≤E2≤E1≤520P.

[0107] According to the second initial opening degree, the compensating opening degree of the first expansion valve 100 is determined.

[0108] The compensation opening is determined by the opening coefficient a and the second initial opening, and the second initial opening is determined by the outdoor temperature. Therefore, the compensation opening is substantially related to the outdoor temperature. The specific determination method can be referred to the following table:

[0109] Outdoor temperature range Compensation opening <![CDATA[T 室外 >A1]]> a*M1 <![CDATA[A2<T 室外 ≤A1]]> a*M2 <![CDATA[A3<T 室外 ≤A2]]> a*M3 <h2 style=";text-align:left;direction:ltr"><![CDATA[T <h2 style=";text-align:left;direction:ltr"> 室外 <h2 style=";text-align:left;direction:ltr"> <A3]]><h2 style=";text-align:left;direction:ltr"> a*M4

[0110] Among them, a is the opening coefficient, 0≤a≤1.

[0111] A first initial opening is determined according to the compensation opening and the basic opening.

[0112] According to the compensation opening and the basic opening, the first initial opening can be determined as shown in the following table:

[0113]

[0114]

[0115] In some embodiments, S300, adjusting the opening of the first expansion valve according to the outdoor heat exchanger coil temperature, and adjusting the opening of the second expansion valve according to the opening of the first expansion valve 100, includes:

[0116] According to the temperature range corresponding to the temperature of the outdoor heat exchanger coil, the adjustment amount of the first expansion valve 100 is determined, and the first expansion valve 100 is adjusted.

[0117] According to the adjustment amount of the first expansion valve 100, the adjustment amount of the second expansion valve is determined, and the second expansion valve is adjusted.

[0118] The specific adjustment method can be found in the following table:

[0119] The first expansion valve adjustment Second expansion valve adjustment <![CDATA[T 盘管 >B+5℃]]> -N1 +(b*N1+c) <![CDATA[B+2℃<T 盘管 ≤B+5℃]]> -N2 +(b*N2+c) <![CDATA[B-1℃<T 盘管 ≤B+2℃]]> Keep it the same Keep it the same <![CDATA[B-4℃<T 盘管 ≤B-1℃]]> +N2 -(b*N2+c) <![CDATA[T 盘管 <B-4℃]]> +N1 -(b*N1+c)

[0120] Wherein, B is the target temperature of the outdoor heat exchanger coil, -10℃≤B≤20℃.

[0121] Wherein, b represents the opening coefficient, 0≤b≤1, c represents the opening correction value, the unit is Pu l se, 0P≤c≤100P.

[0122] Among them, N1 and N2 are opening adjustment amounts, the unit is Pu l se, 0P≤N2≤N1≤450P.

[0123] In some embodiments, the control method further includes:

[0124] When it is determined that the air conditioner is started in heating mode and the outdoor temperature is greater than the preset temperature or the air conditioner is started in cooling mode, the first expansion valve 100 and the second expansion valve are controlled to perform non-anti-freeze control, the first expansion valve is adjusted to the maximum opening, and the opening of the second expansion valve is adjusted according to the exhaust superheat or intake superheat of the compressor.

[0125] Among them, the preset temperature is 0℃.

[0126] The specific method for determining the suction superheat and exhaust superheat of the compressor may refer to the method for determining the suction superheat and exhaust superheat in the above embodiment.

[0127] The actual exhaust temperature is T 实排 , the target exhaust temperature is T 目排 , then the exhaust superheat ΔT 排 =T 实排 -T 目排 .

[0128] Among them, the method of adjusting the opening of the second expansion valve according to the exhaust gas superheat of the compressor can refer to the table below.

[0129] Exhaust superheat Opening adjustment <![CDATA[ΔT 排 >4℃]]> +10 steps / second <![CDATA[1℃<ΔT 排 ≤4℃]]> +5 steps / second <![CDATA[-1℃<ΔT 排 ≤1℃]]> Keep it the same <![CDATA[-4℃<ΔT 排 ≤-1℃]]> -5 steps / second <![CDATA[ΔT 排 ≤-4℃]]> -10 steps / second

[0130] The actual suction temperature is T 实吸 , the target suction temperature is T 目吸 , then the suction superheat ΔT 吸 =T 实吸 -T 目吸 .

[0131] The method of adjusting the opening of the second expansion valve according to the suction superheat of the compressor can refer to the table below.

[0132] Suction superheat Opening adjustment <![CDATA[ΔT 吸 >4℃]]> +10 steps / second <![CDATA[1℃<ΔT 吸 ≤4℃]]> +5 steps / second <![CDATA[-1℃<ΔT 吸 ≤1℃]]> Keep it the same <![CDATA[-4℃<ΔT 吸 ≤-1℃]]> -5 steps / second <![CDATA[ΔT 吸 ≤-4℃]]> -10 steps / second

[0133] In some embodiments, the present invention also provides an air conditioner, which may include a processor 601 with one or more processing cores, a memory 602 with one or more computer-readable storage media, a power supply 603, an input unit 604 and other components. The air conditioner also includes a heat exchanger and a first expansion valve 100 connected to the heat exchanger. The first expansion valve 100 is also connected to the indoor heat exchanger of the air conditioner. The heat exchanger includes a heating medium inlet portion 201, a heating medium outlet portion 202, a subcooling branch 210 and a plurality of heat exchange branches 220. The subcooling branch 210 is connected to the heating medium inlet portion 201. A second expansion valve is arranged on the subcooling branch 210. The plurality of heat exchange branches 220 are connected in parallel between the heating medium outlet portion 202 and the subcooling branch 210. Each heat exchange branch 220 is provided with at least a first throttling device 221. The first expansion valve 100 is connected to the heating medium inlet portion 201. Those skilled in the art will appreciate that the above structure of the air conditioner does not limit the air conditioner, and may include more or fewer components, or a combination of certain components, or different component arrangements.

[0134] The processor 601 is the controller of the air conditioner, and uses various interfaces and lines to connect various parts of the entire air conditioner. By running or executing software programs and / or modules stored in the memory 602, and calling data stored in the memory 602, the processor 601 performs various functions of the air conditioner and processes data, thereby monitoring the air conditioner as a whole. Optionally, the processor 601 may include one or more processing cores; preferably, the processor 601 may integrate an application processor 601 and a modem processor 601, wherein the application processor 601 mainly processes the operating system, user interface and computer programs, etc., and the modem processor 601 mainly processes wireless communications. It is understandable that the above-mentioned modem processor 601 may not be integrated into the processor 601.

[0135] The memory 602 can be used to store software programs and modules. The processor 601 executes various functional applications and data processing by running the software programs and modules stored in the memory. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, a computer program required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the server, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory may also include a memory controller to provide the processor 601 with access to the memory.

[0136] The air conditioner also includes a power supply 603 for supplying power to each component. Preferably, the power supply 603 can be logically connected to the processor 601 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. The power supply can also include any components such as one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, and power status indicators.

[0137] The air conditioner may further include an input unit 604, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0138] Although not shown, the air conditioner may further include a display unit, etc., which will not be described in detail herein. Specifically, in this embodiment, the processor 601 in the air conditioner will load the executable files corresponding to the processes of one or more computer programs into the memory 602 according to the following instructions, and the processor 601 will run the computer programs stored in the memory 602 to perform the following steps:

[0139] When the air conditioner is started in heating mode and the outdoor temperature is lower than a preset temperature, the opening of the first expansion valve and the opening of the second expansion valve are adjusted according to the exhaust temperature of the air conditioner and the running time of the air conditioner;

[0140] When it is determined that the operating time is less than the preset time and the exhaust temperature is not within the preset exhaust temperature range, the first expansion valve is controlled to be adjusted to a first initial opening degree and the second expansion valve is controlled to be adjusted to a second initial opening degree;

[0141] When it is determined that the operating time is greater than or equal to the preset time or the exhaust temperature is within the preset exhaust temperature range, the opening of the first expansion valve is adjusted according to the outdoor unit coil temperature, and the opening of the second expansion valve is adjusted according to the opening of the first expansion valve.

[0142] By executing the above steps, the temperature of the non-azeotropic refrigerant in the heat exchanger is adaptively adjusted by adjusting the first expansion valve and the second expansion valve, thereby suppressing the temperature slip phenomenon of the non-azeotropic refrigerant in the heat exchanger, and keeping the temperature of the non-azeotropic refrigerant in the heat exchanger above 0°C.

[0143] A person skilled in the art will appreciate that all or part of the steps in any of the methods in the above embodiments may be completed by a computer program, or by controlling related hardware through a computer program. The computer program may be stored in a computer-readable storage medium and loaded and executed by the processor 601.

[0144] In some embodiments, the present invention further provides a storage medium, the storage medium stores a computer program, and the computer program is loaded and executed by a processor to perform the following steps:

[0145] When the air conditioner is started in heating mode and the outdoor temperature is lower than a preset temperature, the opening of the first expansion valve and the opening of the second expansion valve are adjusted according to the exhaust temperature of the air conditioner and the running time of the air conditioner;

[0146] When it is determined that the operating time is less than the preset time and the exhaust temperature is not within the preset exhaust temperature range, the first expansion valve is controlled to be adjusted to a first initial opening degree and the second expansion valve is controlled to be adjusted to a second initial opening degree;

[0147] When it is determined that the operating time is greater than or equal to the preset time or the exhaust temperature is within the preset exhaust temperature range, the opening of the first expansion valve is adjusted according to the outdoor unit coil temperature, and the opening of the second expansion valve is adjusted according to the opening of the first expansion valve.

[0148] By executing the above steps, the temperature of the non-azeotropic refrigerant in the heat exchanger is adaptively adjusted by adjusting the first expansion valve and the second expansion valve, thereby suppressing the temperature slip phenomenon of the non-azeotropic refrigerant in the heat exchanger, and keeping the temperature of the non-azeotropic refrigerant in the heat exchanger above 0°C.

[0149] It will be appreciated by those skilled in the art that any reference to memory, storage, database or other medium used in the embodiments provided by the present invention may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synch l ink), DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0150] Since the computer program stored in the storage medium can execute the steps in the air conditioner control method in any embodiment provided by the present invention, the beneficial effects that can be achieved by the air conditioner control method in any embodiment provided by the present invention can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0151] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0152] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0153] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, within the application concept of the present invention are included in the patent protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that: include: Heating medium inlet; Heating medium outlet; A supercooling branch, the supercooling branch being in communication with the heating medium inlet; At least one heat exchange branch, the heat exchange branch being connected between the heating medium outlet and the supercooling branch; Wherein, at least one first throttling component is provided on each of the heat exchange branches, and the first throttling component is used to throttle the working medium passing through the heat exchange branch.

2. The heat exchanger according to claim 1, characterized in that: The heat exchanger has a plurality of heat exchange branches, and the plurality of heat exchange branches are connected in parallel between the heating medium outlet and the supercooling branch.

3. The heat exchanger according to any one of claims 1 or 2, characterized in that: The subcooling branch is provided with a second throttling member, and the second throttling member is used for throttling the working medium passing through the subcooling branch.

4. A control method, characterized in that: Used to control an air conditioner, the air conditioner adopts a non-azeotropic refrigerant, the air conditioner includes a heat exchanger and a first expansion valve connected to the heat exchanger, the first expansion valve is also connected to the indoor heat exchanger of the air conditioner, the heat exchanger includes a heating medium inlet, a heating medium outlet, a subcooling branch and a plurality of heat exchange branches, the subcooling branch is connected to the heating medium inlet, a second expansion valve is arranged on the subcooling branch, a plurality of the heat exchange branches are connected in parallel between the heating medium outlet and the subcooling branch, each of the heat exchange branches is provided with at least a first throttling member, the first expansion valve is connected to the heating medium inlet, and the control method also includes: When the air conditioner is started in heating mode and the outdoor temperature is lower than a preset temperature, adjusting the opening of the first expansion valve and the opening of the second expansion valve according to the exhaust temperature of the air conditioner and the running time of the air conditioner; When it is determined that the operating time is less than the preset time and the exhaust temperature is not within the preset exhaust temperature range, controlling the first expansion valve to be adjusted to a first initial opening degree and the second expansion valve to be adjusted to a second initial opening degree; When it is determined that the operating time is greater than or equal to the preset time or the exhaust temperature is within the preset exhaust temperature range, the opening of the first expansion valve is adjusted according to the outdoor heat exchanger coil temperature, and the opening of the second expansion valve is adjusted according to the opening of the first expansion valve.

5. The control method according to claim 4, characterized in that: After the second expansion valve operates at the second initial opening for a target time, wherein the target time is less than the preset time, the control method further includes: The opening degree of the second expansion valve is adjusted according to the suction superheat degree or the exhaust superheat degree of the compressor of the air conditioner.

6. The control method according to claim 4, characterized in that: Before controlling the first expansion valve to be adjusted to the first initial opening degree and the second expansion valve to be adjusted to the second initial opening degree, the control method further includes: determining the second initial opening degree according to the outdoor temperature; The first initial opening degree is determined according to the outdoor temperature and the second initial opening degree.

7. The control method according to claim 6, characterized in that: The determining the second initial opening degree according to the outdoor temperature comprises: Determine a temperature range corresponding to the outdoor temperature; The second initial opening degree is determined according to the temperature range.

8. The control method according to claim 7, characterized in that: The determining the first initial opening degree according to the outdoor temperature and the second initial opening degree comprises: Determining a basic opening degree of the first expansion valve according to the outdoor temperature; determining a compensation opening of the first expansion valve according to the second initial opening; The first initial opening is determined according to the compensation opening and the basic opening.

9. An air conditioner, characterized in that: The air conditioner includes a memory, a processor, a heat exchanger and a first expansion valve connected to the heat exchanger, the first expansion valve is also connected to the indoor heat exchanger of the air conditioner, the heat exchanger includes a heating medium inlet, a heating medium outlet, a subcooling branch and a plurality of heat exchange branches, the subcooling branch is connected to the heating medium inlet, a second expansion valve is arranged on the subcooling branch, a plurality of the heat exchange branches are connected in parallel between the heating medium outlet and the subcooling branch, each of the heat exchange branches is provided with at least a first throttling device, the first expansion valve is connected to the heating medium inlet, the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in the control method described in any one of claims 4 to 8.

10. A storage medium, characterized in that: The storage medium stores a computer program, and the computer program is loaded and executed by the processor to execute the steps in the control method according to any one of claims 4 to 8.

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