CN115682306A - Defrosting control method, defrosting control device, air conditioner and heat pump system - Google Patents
Defrosting control method, defrosting control device, air conditioner and heat pump system Download PDFInfo
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- CN115682306A CN115682306A CN202211301407.9A CN202211301407A CN115682306A CN 115682306 A CN115682306 A CN 115682306A CN 202211301407 A CN202211301407 A CN 202211301407A CN 115682306 A CN115682306 A CN 115682306A
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000003507 refrigerant Substances 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 118
- 230000008018 melting Effects 0.000 claims description 14
- 238000002844 melting Methods 0.000 claims description 14
- 230000015654 memory Effects 0.000 claims description 7
- 230000002035 prolonged effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000284466 Antarctothoa delta Species 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention provides a defrosting control method, a control device, an air conditioner and a heat pump system, relates to the technical field of air conditioners, and solves the technical problem that energy is wasted when some evaporators are defrosted by high-temperature refrigerants in the prior art. The method comprises detecting an evaporator frosting parameter; judging the frosting degree of the surface of the evaporator; confirming the time T for delaying entering defrosting according to the frosting degree; and controlling the delay time T to enter a defrosting mode. When the frosting degree is judged to be relatively small, at the moment, the influence of frosting on the evaporator is small, the evaporator can be controlled to enter a defrosting mode after the defrosting time T is delayed, and the delay time T is relatively long when the frost layer is thin; when the frosting degree is judged to be relatively large, the time for delaying entering the defrosting process can be controlled to be relatively short, so that the defrosting can be carried out as soon as possible. According to the defrosting control method provided by the invention, the defrosting condition is further judged according to the thickness condition of the frost layer, so that accurate defrosting can be realized, the aims of defrosting with frost and defrosting without frost are realized, and the energy conservation is facilitated.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method, a defrosting control device, an air conditioner and a heat pump system.
Background
In the air conditioning refrigeration and freezing refrigeration industries, the defrosting of the indoor unit of the refrigeration house generally adopts electric heating defrosting, the power consumption is high, energy is not saved, particularly in an ultra-low temperature refrigeration house, the environment temperature in the refrigeration house is very low, and a water receiving disc of an indoor air cooler is frequently frozen, so that water is accumulated on the water receiving disc and a water discharging hole of the water receiving disc is easily blocked by ice, and the normal use of the indoor air cooler is influenced.
The applicant has found that the prior art has at least the following technical problems:
1) When some existing high-temperature refrigerants are adopted to defrost the evaporator, when the evaporator is judged to frost, the evaporator immediately enters into defrosting, and defrosting time is a certain value when the evaporator enters into a defrosting mode, and defrosting is not considered according to the frosting degree to divide the condition to process defrosting, so that accurate defrosting is relatively difficult to achieve, and energy waste exists.
2) The water pan is iced only by high-temperature refrigerants, and the mode of deicing is single.
Disclosure of Invention
The invention aims to provide a defrosting control method, a control device, an air conditioner and a heat pump system, which solve the technical problem that energy is wasted when some evaporators are defrosted by high-temperature refrigerants in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a defrosting control method, which comprises the following steps: detecting evaporator frosting parameters; judging the frosting degree of the surface of the evaporator; confirming the time T for delaying entering defrosting according to the frosting degree; and controlling the delay time T to enter a defrosting mode.
Further, the detecting of the evaporator frosting parameter and the judging of the frosting degree of the surface of the evaporator comprise the following steps: detecting temperature t of refrigerant outlet pipe of evaporator 1 And the temperature t of refrigerant inlet pipe of evaporator 2 (ii) a Temperature t through refrigerant outlet pipe 1 And temperature t of refrigerant inlet pipe 2 And judging the frosting degree of the surface of the evaporator by the value range of the difference value delta t.
Further, the defrosting time when entering the defrosting mode is controlled according to the frosting degree of the surface of the evaporator.
Further, the following is included: when the delta t is less than or equal to B and less than A, judging that the frosting is low; and determining the value range of the time T for delaying the defrosting to be th + b < T ≦ th + c.
Further, the following are included: and when the delta t is less than or equal to B and less than A, controlling the defrosting time of the evaporator to be shortened to emin.
Further, the following is included: when delta t is more than or equal to-A and less than B, judging that the frost is frosted at the middle degree; and determining the value range of the time T for delaying the defrosting to be th-a < T ≦ th.
Further, the following is included: when delta t is more than or equal to-A and less than B, the defrosting time of the evaporator is controlled to be fmin.
Further, the following is included: judging that frosting is high when delta t < -A; and determining the value range of the time T for delaying the defrosting to be T less than or equal to th-a.
Further, the following is included: when delta t < -A, the defrosting time of the evaporator is controlled to be prolonged to pmin.
Further, the following contents are also included: when delta t is larger than or equal to A, judging that the surface of the evaporator is not frosted.
Further, the following is included: judging whether the condition of leading the outdoor unit side hot air to the evaporator is met; if yes, controlling the outdoor unit side hot air to be guided to the evaporator for defrosting of the evaporator.
Further, the following is included: judging whether a water pan of the evaporator is frozen or not; if so, introducing a high-temperature refrigerant into a refrigerant pipeline arranged in the water receiving tray so as to melt ice on the water receiving tray.
Further, the following contents are also included: judging whether the condition of leading the outdoor unit side hot air to the water receiving tray is met; if so, controlling to guide the outdoor unit side hot air to the water receiving tray for deicing the water receiving tray.
Further, the judging whether the condition for guiding the outdoor unit side hot air to the water receiving tray is met includes the following steps: judging whether the time for introducing high-temperature refrigerant into the refrigerant pipeline to melt ice on the water pan is greater than a preset time value T Is provided with (ii) a If yes, judging whether the temperature of the water receiving tray is larger than a preset water receiving tray temperature value T or not Dish (ii) a If not, the condition that the outdoor unit side hot air is guided to the water receiving tray is judged to be met.
The present invention provides a control device, including: the detection module is used for detecting the frosting parameters of the evaporator; the frosting degree judging module is used for judging the frosting degree of the surface of the evaporator; the defrosting module is prolonged, and the time T for delaying entering defrosting is confirmed; and the defrosting control module is used for controlling the evaporator to defrost.
Further, still include: the water pan icing judging module is used for judging whether the water pan is iced or not; and the refrigerant deicing module is used for controlling the refrigerant pipeline to be introduced with a high-temperature refrigerant so as to deicing the water pan.
Further, still include: the outdoor hot air guiding judgment module is used for judging whether the condition of guiding outdoor machine side hot air to the water receiving disc is met; and the hot air deicing module is used for controlling the outdoor hot air to be guided to the water receiving tray.
The present invention provides an air conditioner, comprising: one or more memories having executable programs stored thereon; one or more processors configured to execute the executable programs in the memory to implement the steps of the method.
The invention provides a heat pump system for realizing the defrosting control method, which comprises a compressor, an evaporator and a condenser which are connected through refrigerant pipelines, and is characterized by also comprising an auxiliary evaporator defrosting pipeline, wherein the auxiliary evaporator defrosting pipeline comprises a defrosting inlet pipe and a defrosting outlet pipe, the defrosting inlet pipe is connected with a refrigerant discharge pipe of the compressor and the evaporator, the defrosting outlet pipe is connected with the evaporator and a refrigerant return pipe of the compressor, and a control valve is arranged on the defrosting inlet pipe.
The auxiliary deicing pipeline comprises a water receiving tray pipe section, a deicing inlet pipe section and a deicing outlet pipe section, the water receiving tray pipe section is located in a water receiving tray below the evaporator, the deicing inlet pipe section and the deicing outlet pipe section are connected with the water receiving tray pipe section, the deicing inlet pipe section and the deicing outlet pipe section are respectively connected with the defrosting inlet pipe and the defrosting outlet pipe, and a control valve is arranged on the deicing inlet pipe section.
Furthermore, the outdoor unit air conditioner also comprises a hot air guiding channel structure used for guiding outdoor unit side hot air to the evaporator and/or the water pan.
The invention provides a defrosting control method, which comprises the following steps: detecting an evaporator frosting parameter; judging the frosting degree of the surface of the evaporator; confirming the time T for delaying entering defrosting according to the frosting degree; and controlling the delay time T to enter a defrosting mode. When the frosting degree is judged to be relatively small (namely, the frost layer is thin), at the moment, the influence of frosting on the evaporator is small, but the frosting on the evaporator is generally increased gradually along with the increase of time, so that the defrosting mode is controlled to enter after the defrosting time T is delayed, and the delay time T is relatively long when the frost layer is thin; when the frost formation degree is judged to be relatively large (namely, the frost layer is thick), the time for delaying the defrosting is relatively short because the thickness of the frost layer is thick, so that the defrosting is performed as soon as possible. According to the defrosting control method provided by the invention, the defrosting condition is further judged according to the thickness condition of the frost layer, so that accurate defrosting can be realized, the aims of defrosting with frost and defrosting without frost are realized, and the energy conservation is facilitated.
The preferable technical scheme of the invention can at least produce the following technical effects:
when the frost layer is judged to be relatively thin, the defrosting time can be shortened; when the loudness of the frost layer is judged to be thicker, the defrosting time can be controlled to be prolonged, so that accurate defrosting can be realized under the condition of energy conservation;
the outdoor side hot air can be utilized to deice the water pan, so that the outdoor side hot air is fully utilized while the water pan is deicing. Of course, the outdoor side hot air can be used to defrost the evaporator, that is, the outdoor side hot air is guided to the evaporator to defrost the surface of the evaporator.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a heat pump system provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a defrosting control method provided by an embodiment of the invention;
fig. 3 is a flowchart of a defrosting control method according to an embodiment of the present invention.
FIG. 1-compressor; 2-an oil separator; 3-a finned condenser; 4-an evaporator; 5, a water receiving tray; 6-a main board controller; 7-a first temperature sensor; 8-a second temperature sensor; 9-a chassis temperature sensor; 10-a throttle valve; 11-defrosting electromagnetic valve; 12-a first solenoid valve; 13-a second solenoid valve; 14-a chassis heating electromagnetic valve; 15-oil return electromagnetic valve; 16-a hot air guiding channel; 17-rotating baffles; 18-insulating foamed board.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 2, the present invention provides a defrosting control method, including the following: detecting evaporator frosting parameters; judging the frosting degree of the surface of the evaporator; confirming the time T for delaying entering defrosting according to the frosting degree; and controlling the delay time T to enter a defrosting mode. Judging the frosting degree of the evaporator according to the detected frosting parameters, and controlling the time for delaying entering the defrosting to be relatively longer when the frosting degree is judged to be relatively smaller (namely the frost layer is thinner); when the frost formation degree is judged to be relatively large (namely, the frost layer is thick), the time for controlling the delay of entering the defrosting is relatively short.
When the frosting degree is judged to be relatively small (namely the frost layer is relatively thin), at the moment, the influence of frosting on the evaporator is small, and through research, the frost layer with a certain thickness is beneficial to heat exchange of the evaporator, but the frosting on the evaporator is generally increased gradually along with the increase of time, so that the evaporator enters a defrosting mode after the defrosting time T is delayed, and the delay time T is relatively long when the frost layer is relatively thin; when the frosting degree is judged to be relatively large (namely, the frost layer is thick), the time for delaying the defrosting is relatively short because the thickness of the frost layer is thick, so that the defrosting is carried out as soon as possible. According to the defrosting control method provided by the invention, the defrosting condition is further judged according to the thickness condition of the frost layer, so that accurate defrosting can be realized, the aims of defrosting with frost and defrosting without frost are fulfilled, and the energy conservation is facilitated.
The method for detecting the evaporator frosting parameter and judging the evaporator surface frosting degree specifically comprises the following steps: detecting the temperature t of the refrigerant outlet pipe of the evaporator 1 And temperature t of refrigerant inlet pipe of evaporator 2 (ii) a Through a pipe for discharging refrigerantTemperature t 1 And temperature t of refrigerant inlet pipe 2 And judging the frosting degree of the surface of the evaporator through the value range of the difference delta t. When the evaporator is not frosted and normally exchanges heat, the temperature t of the refrigerant outlet pipe 1 Is higher than the temperature t of the refrigerant inlet pipe 2 When the surface of the evaporator is frosted, the heat exchange of the evaporator can be influenced, and further, the temperature t of the refrigerant outlet pipe can be influenced 1 And temperature t of refrigerant inlet pipe 2 The difference delta t, therefore, the temperature t of the refrigerant outlet pipe can be passed 1 And temperature t of refrigerant inlet pipe 2 And judging the frosting condition of the surface of the evaporator by the difference delta t.
In addition, the defrosting time when entering the defrosting mode is controlled according to the frosting degree of the surface of the evaporator. When the frost layer is judged to be relatively thin, the defrosting time can be shortened; when judging that the loudness of the frost layer is thicker, the controllable extension defrosting time to do benefit to under the energy-conserving circumstances, realize accurate defrosting.
Next, referring to fig. 3, an embodiment of a defrosting control method is provided, and the contents of the method are specifically illustrated:
example 1:
the invention provides a defrosting control method, which comprises the following steps: detecting evaporator frosting parameters; judging the frosting degree of the surface of the evaporator; confirming the time T for delaying entering defrosting according to the frosting degree; and controlling the delay time T to enter a defrosting mode.
The method for detecting the evaporator frosting parameters and judging the frosting degree of the surface of the evaporator specifically comprises the following steps: detecting temperature t of refrigerant outlet pipe of evaporator 1 And the temperature t of refrigerant inlet pipe of evaporator 2 (ii) a Temperature t through refrigerant outlet pipe 1 And temperature t of refrigerant inlet pipe 2 And judging the frosting degree of the surface of the evaporator by the value range of the difference value delta t. Namely, the temperature t of the refrigerant outlet pipe of the evaporator is detected in real time by a sensor 1 And the temperature t of refrigerant inlet pipe of evaporator 2 The temperature t of the refrigerant pipe is determined at intervals of set time 1 And temperature t of refrigerant inlet pipe 2 The difference Δ t.
When the delta t is less than or equal to B and less than A, judging that the frosting is low; and determining the value range of the time T for delaying the defrosting to be th + b < T ≦ th + c. Delta t is less than A when B is more than or equal to A, and the value of the difference delta t is between the numerical value B and the numerical value A; th + b < T ≦ th + c, indicating that the time T takes a value between th + b seconds and th + c seconds. Wherein, A, B, th, B and c are parameter values larger than zero. Namely, when the delta t is judged to be less than or equal to B and less than A, the time of delaying th + B-th + c is controlled to enter a defrosting mode.
In addition, when B.ltoreq.t<And A, controlling the defrosting time of the evaporator to be shortened to emin. The standard defrosting time is preset to be T in the system Sign When B is less than or equal to delta t<When A is reached, the defrosting time of the evaporator is controlled to be T Sign E minutes, namely, the defrosting time of the evaporator is shortened to emin. Since when B is less than or equal to delta t<And when the frost is formed, judging that the frost is formed to a low degree, namely the thickness of a frost layer is relatively small, and although the time from th + b to th + c is delayed to enter a defrosting mode, the thickness of the frost layer is not very thick, so that the defrosting time of the evaporator is controlled to be reduced to emin, and the energy conservation is facilitated.
When delta t is more than or equal to-A and less than B, judging that the frost is formed at the middle range; and determining the value range of the time T for delaying the defrosting to be th-a < T < th. Delta t is less than or equal to A and less than B, and the difference delta t is between the value-A and the value B; th-a < T ≦ th, which indicates that the time T takes a value between th-a second and th second, wherein a is a parameter value greater than zero. Namely, when the delta t is judged to be less than or equal to-A and less than B, the time of delaying th-a-th is controlled to enter the defrosting mode.
In addition, when-A.ltoreq.t<And B, controlling the defrosting time of the evaporator to be fmin. The standard defrosting time is preset to be T in the system Sign when-A ≦ Δ t<When B, controlling the defrosting time of the evaporator to be T Sign board + f minutes, i.e. evaporator defrost time delay fmin.
Judging that frosting is high when delta t < -A; and determining the value range of the time T for delaying the defrosting to be T less than or equal to th-a. Delta t < -A, which indicates that the difference delta t takes values in the range less than the value-A; t is less than or equal to th-a, and the value of the time T is within the range of no more than th-a seconds. Namely, when the delta t < -A is judged, the time delayed by 0-th-a is controlled to enter the defrosting mode so as to realize the quick entering of the defrosting mode.
In addition, when Δ t<at-A, the defrosting time of the evaporator is controlled to be pmin, wherein p>f. The standard defrosting time is preset to be T in the system Sign When Δ t<At time-A, controlling defrosting time of the evaporator to be T Sign + p minutes, i.e. evaporator defrost time delay pmin.
And for-A less than or equal to delta t < B and delta t < -A, the defrosting time is delayed, namely when the frosting is judged to be thick, the defrosting time needs to be increased so as to be beneficial to discharging the frosting of the evaporator. The longer the defrosting time is extended as the frosting thickness is larger.
When delta t is larger than or equal to A, judging that the surface of the evaporator is not frosted. The delta t is more than or equal to A, and the value of the delta t is shown in the range of not less than the value A. Namely, when delta t is more than or equal to A, judging that the surface of the evaporator is not frosted, and not entering a defrosting mode.
Example 2:
different from the embodiment 1, the defrosting control method of the embodiment 2 further includes a control process of deicing the water tray, which is specifically described as follows:
judging whether a water receiving tray of the evaporator is frozen or not; if so, introducing a high-temperature refrigerant into a refrigerant pipeline arranged in the water receiving tray so as to melt ice on the water receiving tray. Among the prior art, indoor air-cooler water collector often freezes, leads to water collector ponding and the drain hole ice stifled, influences indoor air-cooler's normal use. Therefore, it is necessary to perform a deicing operation on the water tray. The ice melting operation of the water pan can be realized by utilizing a high-temperature refrigerant through a refrigerant pipeline arranged in the water pan.
Preferably, the following is also included: judging whether the condition of leading the outdoor unit side hot air to the water receiving tray is met; if so, controlling to guide the outdoor unit side hot air to the water receiving tray for deicing the water receiving tray. The hot air at the outdoor unit side can be used for deicing the water pan. Of course, the outdoor side hot air can be used to defrost the evaporator, that is, the outdoor side hot air is guided to the evaporator to defrost the surface of the evaporator.
When the high-temperature refrigerant and the outdoor hot air butt-joint water tray are adopted for deicing simultaneously, the specific control process can be as follows: judging whether a water pan of the evaporator is frozen or not; if the water pan of the evaporator is judged to be frozen, high-temperature refrigerants are introduced into a refrigerant pipeline arranged in the water pan and used for feeding water into the water panMelting ice; judging whether the time for introducing high-temperature refrigerant into the refrigerant pipeline to melt ice on the water pan is greater than a preset time value T Is provided with (ii) a If the time for introducing the high-temperature refrigerant into the refrigerant pipeline to melt the ice of the water pan is greater than the preset time value T Is provided with Then judging whether the temperature of the water receiving tray is larger than a preset water receiving tray temperature value T or not Dish (T Dish Can be 0); if the temperature of the water receiving tray is not more than the preset temperature value T of the water receiving tray Dish And controlling the outdoor unit side hot air to be guided to the water receiving tray for deicing the water receiving tray.
Example 3:
the present invention provides a control device, including: the detection module is used for detecting the frosting parameters of the evaporator; the frosting degree judging module is used for judging the frosting degree of the surface of the evaporator; the defrosting module is prolonged, and the time T for delaying entering defrosting is confirmed; and the defrosting control module is used for controlling the evaporator to defrost.
The detection module comprises a first temperature sensor 7 and a second temperature sensor 8, the first temperature sensor 7 detects the temperature t of the refrigerant outlet pipe of the evaporator 1 And the temperature t of the refrigerant inlet pipe of the evaporator of the second temperature sensor 8 2 . The frosting degree judgment module judges the temperature t of the refrigerant outlet pipe 1 And temperature t of refrigerant inlet pipe 2 And judging the frosting degree of the surface of the evaporator by the value range of the difference value delta t.
The control device further includes: the water pan icing judging module is used for judging whether the water pan is iced or not; and the refrigerant deicing module is used for controlling the refrigerant pipeline to be introduced with a high-temperature refrigerant so as to deicing the water pan.
The icing judging module of the water receiving tray comprises a chassis temperature sensor 9, the chassis temperature sensor 9 detects the temperature of the water receiving tray, and when the chassis temperature sensor 9 detects that the temperature of the water receiving tray is less than 0, the icing judging module of the water receiving tray judges that the water receiving tray is iced.
The control device further includes: the outdoor hot air guiding judgment module is used for judging whether the condition of guiding outdoor machine side hot air to the water receiving disc is met; and the hot air deicing module is used for controlling the outdoor hot air to be guided to the water receiving tray.
With regard to the control device in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the above embodiment of the related method, and will not be elaborated here.
Example 4:
an air conditioner comprising: one or more memories having executable programs stored thereon; one or more processors configured to execute the executable program in the memory to implement the steps of the method of embodiment 1 or embodiment 2.
With regard to the air conditioner in the above embodiments, the specific manner of executing the program in the memory by the processor has been described in detail in the embodiments related to the method, and will not be elaborated here.
Example 5:
a heat pump system for a defrosting control method comprises a compressor, an evaporator and a condenser which are connected through refrigerant pipelines, and further comprises an auxiliary evaporator defrosting pipeline, wherein the auxiliary evaporator defrosting pipeline comprises a defrosting inlet pipe and a defrosting outlet pipe, the defrosting inlet pipe is connected with a refrigerant discharge pipe and an evaporator of the compressor, the defrosting outlet pipe is connected with a refrigerant return pipe of the evaporator and the compressor, and the defrosting inlet pipe is provided with a control valve.
Referring to fig. 1, a heat pump system is illustrated, which includes a compressor 1, an oil separator 2, a finned condenser 3, a throttle valve 10, and an evaporator 4. When the heat pump system carries out refrigeration, the gas-liquid mixture is discharged from an exhaust port of the compressor 1 and enters the oil separator 2, after the high-temperature and high-pressure gas-liquid mixture is separated by the oil separator 2, the separated liquid returns to a suction port of the compressor 1 from the bottom of the oil separator 2 through the oil return electromagnetic valve 11, the oil return electromagnetic valve 11 is controlled to be switched by the mainboard controller 6, when the oil is detected at the bottom of the oil separator 2 or the system is lack of oil, the oil return electromagnetic valve 11 is switched on, otherwise, the oil return electromagnetic valve 11 is switched off; and at this moment, the high-temperature high-pressure gas comes out from the outlet of the oil separator 2, enters the finned condenser 3, is condensed by the finned condenser 3 to become low-temperature high-pressure liquid, is throttled by the throttle valve 10 to become low-temperature low-pressure liquid, enters the evaporator 4 to be evaporated, then becomes low-temperature low-pressure gas, returns to the air suction port of the compressor 1, and becomes a high-temperature high-pressure gas-liquid mixture after the low-temperature low-pressure gas is compressed by the compressor 1, so that a refrigeration cycle is completed.
The invention is improved, and is additionally provided with an auxiliary evaporator defrosting pipeline so as to facilitate defrosting operation of the evaporator 4. Referring to fig. 1, a branch, namely a defrosting inlet pipe, is arranged at an outlet of the oil separator 2, the defrosting inlet pipe is connected with the evaporator 4, a defrosting electromagnetic valve 11 and a first electromagnetic valve 12 are arranged on the defrosting inlet pipe, a second electromagnetic valve 13 is arranged on the defrosting outlet pipe, and the defrosting outlet pipe is connected with a refrigerant return pipe of the compressor.
Referring to fig. 1, a second temperature sensor 8 is arranged on a pipeline which is throttled by a throttle valve 10 and flows to the evaporator 4, and the second temperature sensor 8 detects the temperature t of a refrigerant inlet pipe of the evaporator 2 (ii) a After the refrigerant enters the evaporator 4 to be evaporated, the low-temperature low-pressure liquid is changed into low-temperature low-pressure gas which flows to the air suction port of the compressor 1 through a pipeline (a pipeline provided with a first temperature sensor 7), and the first temperature sensor 7 is used for detecting the temperature t of the refrigerant outlet pipe of the evaporator 1 . The second temperature sensor 8 and the first temperature sensor 7 are both connected with the first temperature sensor 7.
Detecting the temperature t of the refrigerant outlet pipe of the evaporator 1 And temperature t of refrigerant inlet pipe of evaporator 2 (ii) a Temperature t through refrigerant outlet pipe 1 And temperature t of refrigerant inlet pipe 2 And judging the frosting degree of the surface of the evaporator by the value range of the difference value delta t. When the frost on the surface of the evaporator is judged, the throttle valve is closed, the defrosting electromagnetic valve 11, the first electromagnetic valve 12 and the second electromagnetic valve 13 are opened, the high-temperature refrigerant discharged from the oil separator 2 flows to the evaporator 4 through the defrosting electromagnetic valve 11 and the first electromagnetic valve 12, flows back to the compressor 1 through the second electromagnetic valve 13 after passing through the evaporator 4, and the defrosting treatment of the evaporator 4 is realized.
Preferably, the heat pump system further comprises an auxiliary deicing pipeline, the auxiliary skating pipeline comprises a water pan pipe section, a deicing inlet pipe section and a deicing outlet pipe section, the water pan pipe section is located in the water pan 5 below the evaporator 4, the deicing inlet pipe section and the deicing outlet pipe section are both connected with the water pan pipe section, the deicing inlet pipe section and the deicing outlet pipe section are respectively connected with a defrosting inlet pipe and a defrosting outlet pipe, and a control valve is arranged on the deicing inlet pipe section.
Referring to fig. 1, a chassis heating solenoid valve 14 is arranged on the ice melting inlet pipe section, the connection position of the ice melting inlet pipe section and the defrosting inlet pipe is located between the defrosting solenoid valve 11 and the first solenoid valve 12, the ice melting outlet pipe section is connected with the defrosting outlet pipe, and a solenoid valve can also be arranged on the ice melting outlet pipe section. The bottom of the water pan 5 is provided with a chassis temperature sensor 9, the chassis temperature sensor 9 is connected with the mainboard controller 6, and when the chassis temperature sensor 9 detects that the temperature of the water pan 5 is less than 0 ℃, the mainboard controller 6 judges that the water pan 5 is frozen and needs to perform deicing operation on the water pan 5.
When the water pan 5 needs to be deiced, the defrosting electromagnetic valve 11 and the chassis heating electromagnetic valve 14 are opened, the first electromagnetic valve 12 and the second electromagnetic valve 13 are closed, and the high-temperature refrigerant discharged from the oil separator 2 flows to the water pan pipe section located in the water pan 5 through the defrosting electromagnetic valve 11 and the chassis heating electromagnetic valve 14, flows back to the compressor 1 through the pipeline after passing through the water pan pipe section, so that the deicing treatment on the water pan 5 is realized.
When defrosting the evaporator and defrosting the water pan at the same time, the throttle valve 10 is required to be closed, and the defrosting solenoid valve 11, the first solenoid valve 12, the second solenoid valve 13 and the chassis heating solenoid valve 14 are opened at the same time.
Preferably, the heat pump system further comprises a hot air channel structure for guiding the outdoor machine side hot air to the evaporator and/or the water pan. The hot air at the outdoor unit side can be used for deicing the water tray. Of course, the outdoor side hot air can be used to defrost the evaporator, that is, the outdoor side hot air is guided to the evaporator to defrost the surface of the evaporator.
Referring to fig. 1, the hot air induction channel 16 is illustrated, showing the discharge opening of the hot air induction channel 16 facing the drip tray 5. The inlet end of the hot air guiding channel 16 is provided with a rotary baffle 17, the rotary baffle 17 is connected with a driving mechanism, and the driving mechanism is connected with the main board controller 6. When outdoor hot air needs to be led to water receiving tray 5, the driving mechanism is controlled to open rotary baffle 17, the driving fan is started, and the outdoor hot air is led to water receiving tray 5 under the driving of the driving fan.
In addition, when the high temperature refrigerant and the outdoor side are used simultaneouslyWhen the hot air butt joint water tray melts ice, the specific control process can be as follows: judging whether a water pan of the evaporator is frozen or not; if the water pan of the evaporator is judged to be frozen, high-temperature refrigerants are introduced into a refrigerant pipeline arranged in the water pan and used for deicing the water pan; judging whether the time for introducing high-temperature refrigerants into the refrigerant pipeline to melt ice on the water receiving tray is greater than a preset time value T or not Is provided with (ii) a If the time for introducing the high-temperature refrigerant into the refrigerant pipeline to melt the ice of the water pan is greater than the preset time value T Is provided with Then judging whether the temperature of the water receiving tray is greater than the preset water receiving tray temperature value T or not Dish (T Dish Can be 0); if the temperature of the water receiving tray is not more than the preset temperature value T of the water receiving tray Dish And controlling the outdoor unit side hot air to be guided to the water receiving tray for deicing the water receiving tray.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar contents in other embodiments may be referred to for the contents which are not described in detail in some embodiments.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (21)
1. A defrosting control method is characterized by comprising the following steps:
detecting evaporator frosting parameters;
judging the frosting degree of the surface of the evaporator;
confirming the time T for delaying entering defrosting according to the frosting degree;
and controlling the delay time T to enter a defrosting mode.
2. The defrosting control method according to claim 1, wherein the detecting evaporator frosting parameters and the judging evaporator surface frosting degree comprise the following steps:
detecting the temperature t of the refrigerant outlet pipe of the evaporator 1 And temperature t of refrigerant inlet pipe of evaporator 2 ；
Temperature t through refrigerant outlet pipe 1 And temperature t of refrigerant inlet pipe 2 And judging the frosting degree of the surface of the evaporator by the value range of the difference value delta t.
3. The defrosting control method according to claim 1, further comprising:
and controlling the defrosting time when entering the defrosting mode according to the frosting degree of the surface of the evaporator.
4. The defrosting control method according to claim 2, comprising:
when the delta t is less than or equal to B and less than A, judging that the frosting is low;
and determining the value range of the time T for delaying the defrosting to be th + b < T ≦ th + c.
5. The defrosting control method according to claim 4, comprising the following:
and when the delta t is less than or equal to B and less than A, controlling the defrosting time of the evaporator to be shortened to emin.
6. The defrosting control method according to claim 2, comprising:
when delta t is more than or equal to-A and less than B, judging that the frost is frosted at the middle degree;
and determining the value range of the time T for delaying the defrosting to be th-a < T ≦ th.
7. The defrosting control method according to claim 6, comprising the following:
when delta t is more than or equal to-A and less than B, the defrosting time of the evaporator is controlled to be fmin.
8. The defrosting control method according to claim 2, comprising:
judging that frosting is high when delta t < -A;
and determining the value range of the time T for delaying the defrosting to be T less than or equal to th-a.
9. The defrosting control method according to claim 8, comprising the following:
when delta t < -A, the defrosting time of the evaporator is controlled to be prolonged to pmin.
10. The defrosting control method according to claim 2, further comprising:
when delta t is larger than or equal to A, judging that the surface of the evaporator is not frosted.
11. The defrosting control method according to any one of claims 1 to 10, comprising:
judging whether the condition of leading the outdoor unit side hot air to the evaporator is met;
if yes, the outdoor unit side hot air is controlled to be guided to the evaporator to be used for defrosting the evaporator.
12. The defrosting control method according to any one of claims 1 to 10, comprising:
judging whether a water pan of the evaporator is frozen or not;
if so, introducing high-temperature refrigerants into a refrigerant pipeline arranged in the water receiving tray so as to melt ice on the water receiving tray.
13. The defrosting control method according to claim 12, further comprising:
judging whether the condition of guiding the outdoor unit side hot air to the water receiving tray is met;
if so, controlling to guide the outdoor unit side hot air to the water receiving tray for deicing the water receiving tray.
14. The defrosting control method according to claim 13, wherein the determination as to whether or not a condition for guiding outdoor unit side hot air to the water collector is satisfied includes:
judging whether the time for introducing high-temperature refrigerant into the refrigerant pipeline to melt ice on the water pan is greater than a preset time value T Is provided with ；
If yes, judging whether the temperature of the water receiving tray is larger than a preset water receiving tray temperature value T or not Disc ；
If not, the condition that the outdoor unit side hot air is guided to the water receiving tray is judged to be met.
15. A control device, comprising:
the detection module is used for detecting the frosting parameters of the evaporator;
the frosting degree judging module is used for judging the frosting degree of the surface of the evaporator;
the defrosting module is prolonged, and the time T for delaying entering defrosting is confirmed;
and the defrosting control module is used for controlling the evaporator to defrost.
16. The control device according to claim 15, characterized by further comprising:
the water pan icing judging module is used for judging whether the water pan is iced or not;
and the refrigerant deicing module is used for controlling the refrigerant pipeline to be introduced with a high-temperature refrigerant so as to deicing the water pan.
17. The control device according to claim 16, characterized by further comprising:
the outdoor hot air guiding judgment module is used for judging whether the condition of guiding outdoor machine side hot air to the water receiving disc is met;
and the hot air deicing module is used for controlling the outdoor hot air to be guided to the water receiving tray.
18. An air conditioner, comprising:
one or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of the method of any one of claims 1-14.
19. A heat pump system for implementing the defrosting control method according to any one of claims 1 to 14, comprising a compressor, an evaporator and a condenser connected by a refrigerant pipeline, and further comprising an auxiliary evaporator defrosting pipeline, wherein the auxiliary evaporator defrosting pipeline comprises a defrosting inlet pipe and a defrosting outlet pipe, the defrosting inlet pipe is connected with a refrigerant discharge pipe of the compressor and the evaporator, the defrosting outlet pipe is connected with a refrigerant return pipe of the evaporator and the compressor, and the defrosting inlet pipe is provided with a control valve.
20. The heat pump system according to claim 19, further comprising an auxiliary deicing pipeline, wherein the auxiliary deicing pipeline comprises a water pan pipe section, an ice melting inlet pipe section and an ice melting outlet pipe section, the water pan pipe section is located in a water pan below the evaporator, the ice melting inlet pipe section and the ice melting outlet pipe section are both connected to the water pan pipe section, the ice melting inlet pipe section and the ice melting outlet pipe section are respectively connected to the frost melting inlet pipe and the frost melting outlet pipe, and a control valve is arranged on the ice melting inlet pipe section.
21. The heat pump system of claim 19, further comprising a hot air channel to direct outdoor machine side hot air to the evaporator and/or the drip pan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211301407.9A CN115682306A (en) | 2022-10-24 | 2022-10-24 | Defrosting control method, defrosting control device, air conditioner and heat pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211301407.9A CN115682306A (en) | 2022-10-24 | 2022-10-24 | Defrosting control method, defrosting control device, air conditioner and heat pump system |
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| CN115682306A true CN115682306A (en) | 2023-02-03 |
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| CN202211301407.9A Withdrawn CN115682306A (en) | 2022-10-24 | 2022-10-24 | Defrosting control method, defrosting control device, air conditioner and heat pump system |
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| CN101113859A (en) * | 2006-07-28 | 2008-01-30 | 海尔集团公司 | Refrigerator evaporator defrost method and defrosting device using the method |
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| CN110553436A (en) * | 2019-08-20 | 2019-12-10 | 广东纽恩泰新能源科技发展有限公司 | method for judging frosting and dust deposition of heat pump |
| CN214665504U (en) * | 2021-02-07 | 2021-11-09 | 珠海格力电器股份有限公司 | Defrosting system and refrigerator |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113859A (en) * | 2006-07-28 | 2008-01-30 | 海尔集团公司 | Refrigerator evaporator defrost method and defrosting device using the method |
| CN107166643A (en) * | 2017-05-17 | 2017-09-15 | 青岛海尔空调器有限总公司 | A kind of control method and device of air-conditioning |
| CN109323373A (en) * | 2018-10-17 | 2019-02-12 | 青岛海尔空调器有限总公司 | Air conditioner defrosting control method |
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