CN117232186A

CN117232186A - Drying equipment, control method and control device thereof

Info

Publication number: CN117232186A
Application number: CN202311204635.9A
Authority: CN
Inventors: 张龙爱; 刘磊; 张鸿宙; 杨和澄
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-09-18
Filing date: 2023-09-18
Publication date: 2023-12-15

Abstract

The disclosure provides drying equipment, a control method and a control device thereof, and relates to the technical field of heat pumps. The drying equipment comprises a compressor, a condenser, a first expansion valve, an auxiliary heat exchanger, a second expansion valve, an evaporator, a gas-liquid separator and a control device which are sequentially arranged along the refrigerant flow direction, wherein the control device is configured to realize drying control by carrying out temperature rise control and dehumidification control on adjustment of the first expansion valve and the second expansion valve.

Description

Drying equipment, control method and control device thereof

Technical Field

The disclosure relates to the technical field of heat pumps, and in particular relates to drying equipment, a control method and a control device thereof.

Background

The air source heat pump drying equipment comprises open type drying equipment and closed type drying equipment. The open type drying apparatus has superior dehumidifying performance, but is low in energy efficiency due to direct air exchange with the environment. The closed type drying equipment is more environment-friendly and efficient, but the closed type drying equipment is often realized through a four-way reversing valve.

Disclosure of Invention

The embodiment of the disclosure provides a drying device, which comprises a compressor, a condenser, a first expansion valve, an auxiliary heat exchanger, a second expansion valve, an evaporator, a gas-liquid separator and a control device, wherein the compressor, the condenser, the first expansion valve, the auxiliary heat exchanger, the second expansion valve, the evaporator and the gas-liquid separator are sequentially arranged along the refrigerant flow direction, and the control device is configured to realize drying control by performing temperature rise control and dehumidification control on adjustment of the first expansion valve and the second expansion valve. Thus, a drying apparatus is realized based on the expansion valve.

Some embodiments of the present disclosure provide a drying apparatus, including:

a compressor, a condenser, a first expansion valve, an auxiliary heat exchanger, a second expansion valve, an evaporator, a gas-liquid separator and a control device which are sequentially arranged along the refrigerant flow direction,

the control device is configured to perform temperature-raising control and dehumidification control by adjusting the first expansion valve and the second expansion valve to realize drying control.

In some embodiments, further comprising: the control device is configured to adjust the first expansion valve according to a current second temperature difference during temperature rise control, wherein the second temperature difference is a difference between a second temperature detected by the second temperature sensor and a first temperature detected by the first temperature sensor.

In some embodiments, the control device is configured to:

determining a first adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current second temperature difference and the second temperature difference when the current second temperature difference is in a first range, and controlling the first expansion valve to increase the first adjustment value on the basis of the current opening degree, wherein the first range is larger than the upper limit value of the second temperature difference or smaller than the lower limit value of the second temperature difference; or,

And when the current second temperature difference is in a second range, controlling the first expansion valve to maintain the current opening, wherein the second range is a lower limit value of the second temperature difference or more and an upper limit value of the second temperature difference or less.

In some embodiments, the control device is configured to: and taking the difference value of the intermediate value between the lower limit value and the upper limit value of the current second temperature difference and the second temperature difference as the first adjustment value.

In some embodiments, further comprising: a third temperature sensor disposed on an outlet side of the condenser, a pressure sensor disposed on an inlet side of the condenser, the control device configured to: and under the condition that the current second temperature difference is in a third range and the first expansion valve is not operated for a first duration, adjusting the second expansion valve according to the current first temperature difference, wherein the third range is positioned in the second range, and is more than or equal to the sum of the lower limit value of the second temperature difference and the first value and less than or equal to the difference value of the upper limit value of the second temperature difference and the first value, and the first temperature difference is the difference value between the temperature obtained by converting the pressure detected by the pressure sensor and the third temperature detected by the third temperature sensor.

In some embodiments, the control device is configured to:

determining a second adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current first temperature difference and the first temperature difference when the current first temperature difference is in a fourth range, and controlling the second expansion valve to increase the second adjustment value on the basis of the current opening degree, wherein the fourth range is larger than the upper limit value of the first temperature difference or smaller than the lower limit value of the first temperature difference; or,

and when the current first temperature difference is in a fifth range, the second expansion valve is controlled to maintain the current opening degree, wherein the fifth range is a lower limit value of the first temperature difference or more and an upper limit value of the first temperature difference or less.

In some embodiments, the control device is configured to: and taking the difference value of the intermediate value between the current first temperature difference and the lower limit value and the upper limit value of the first temperature difference as the second adjustment value.

In some embodiments, the control device is configured to: and controlling the second expansion valve to maintain the current opening degree under the condition that the current second temperature difference is in a sixth range, wherein the sixth range is positioned in the second range and is smaller than the sum of the lower limit value of the second temperature difference and a second value or larger than the difference between the upper limit value of the second temperature difference and the second value, and the second value is smaller than the first value.

In some embodiments, the control device is configured to: the second expansion valve is controlled to maintain the opening upper limit.

In some embodiments, further comprising: and a fourth temperature sensor provided at an inlet side of the evaporator, a fifth temperature sensor provided at an outlet side of the evaporator, the control device being configured to adjust the second expansion valve according to a current third temperature difference at the time of dehumidification control, wherein the third temperature difference is a difference between a fifth temperature detected by the fifth temperature sensor and a fourth temperature detected by the fourth temperature sensor.

In some embodiments, the control device is configured to:

determining a third adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current third temperature difference and the third temperature difference when the current third temperature difference is in a seventh range, and controlling the second expansion valve to increase the third adjustment value on the basis of the current opening degree, wherein the seventh range is larger than the upper limit value of the third temperature difference or smaller than the lower limit value of the third temperature difference; or,

and controlling the second expansion valve to maintain the current opening degree when the current third temperature difference is in an eighth range, wherein the eighth range is a lower limit value of the third temperature difference or more and an upper limit value of the third temperature difference or less.

In some embodiments, the control device is configured to: and taking the difference value of the intermediate value between the lower limit value and the upper limit value of the current third temperature difference and the third temperature difference as the third adjustment value.

In some embodiments, the control device is configured to: the first expansion valve is controlled to maintain the opening upper limit.

In some embodiments, further comprising: a first fan disposed at the condenser, a second fan disposed at the auxiliary heat exchanger, and a third fan disposed at the evaporator, the control device being configured to: during temperature rise control, the rotating speed of the first fan and the rotating speed of the second fan are controlled to be higher than the rotating speed of the third fan; or, in the dehumidification control, the rotation speed of the third fan and the second fan is controlled to be higher than that of the first fan.

Some embodiments of the present disclosure provide a control method of a drying apparatus, including: a compressor, a condenser, a first expansion valve, an auxiliary heat exchanger, a second expansion valve, an evaporator, and a gas-liquid separator, and a control device, which are sequentially arranged along a refrigerant flow direction, the method comprising: the temperature rise control and the dehumidification control are carried out through the adjustment of the first expansion valve and the second expansion valve, so that the drying control is realized.

In some embodiments, the drying apparatus further comprises: a first temperature sensor provided on an inlet side of the auxiliary heat exchanger, a second temperature sensor provided on an outlet side of the auxiliary heat exchanger, the temperature increase control including: and adjusting the first expansion valve according to the current second temperature difference, wherein the second temperature difference is a difference value between the second temperature detected by the second temperature sensor and the first temperature detected by the first temperature sensor.

In some embodiments, adjusting the first expansion valve based on the current second temperature differential includes: determining a first adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current second temperature difference and the second temperature difference when the current second temperature difference is in a first range, and controlling the first expansion valve to increase the first adjustment value on the basis of the current opening degree, wherein the first range is larger than the upper limit value of the second temperature difference or smaller than the lower limit value of the second temperature difference; or, when the current second temperature difference is in a second range, the first expansion valve is controlled to maintain the current opening, and the second range is a lower limit value of the second temperature difference or more and an upper limit value of the second temperature difference or less.

In some embodiments, determining the first adjustment value includes: and taking the difference value of the intermediate value between the lower limit value and the upper limit value of the current second temperature difference and the second temperature difference as the first adjustment value.

In some embodiments, the drying apparatus further comprises: a third temperature sensor provided at an outlet side of the condenser, a pressure sensor provided at an inlet side of the condenser, the temperature increase control including: and under the condition that the current second temperature difference is in a third range and the first expansion valve is not operated for a first duration, adjusting the second expansion valve according to the current first temperature difference, wherein the third range is positioned in the second range, and is more than or equal to the sum of the lower limit value of the second temperature difference and the first value and less than or equal to the difference value of the upper limit value of the second temperature difference and the first value, and the first temperature difference is the difference value between the temperature obtained by converting the pressure detected by the pressure sensor and the third temperature detected by the third temperature sensor.

In some embodiments, adjusting the second expansion valve based on the current first temperature difference comprises: determining a second adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current first temperature difference and the first temperature difference when the current first temperature difference is in a fourth range, and controlling the second expansion valve to increase the second adjustment value on the basis of the current opening degree, wherein the fourth range is larger than the upper limit value of the first temperature difference or smaller than the lower limit value of the first temperature difference; alternatively, when the current first temperature difference is in a fifth range, which is a lower limit value of the first temperature difference or more and an upper limit value of the first temperature difference or less, the second expansion valve is controlled to maintain the current opening degree.

In some embodiments, determining the second adjustment value includes: and taking the difference value of the intermediate value between the current first temperature difference and the lower limit value and the upper limit value of the first temperature difference as the second adjustment value.

In some embodiments, the performing the temperature increase control includes: and controlling the second expansion valve to maintain the current opening degree under the condition that the current second temperature difference is in a sixth range, wherein the sixth range is positioned in the second range and is smaller than the sum of the lower limit value of the second temperature difference and a second value or larger than the difference between the upper limit value of the second temperature difference and the second value, and the second value is smaller than the first value.

In some embodiments, the performing temperature increase control further includes: the second expansion valve is controlled to maintain the opening upper limit.

In some embodiments, the drying apparatus further comprises: a fourth temperature sensor provided at an inlet side of the evaporator, a fifth temperature sensor provided at an outlet side of the evaporator, the performing dehumidification control including: and adjusting the second expansion valve according to the current third temperature difference, wherein the third temperature difference is a difference value between the fifth temperature detected by the fifth temperature sensor and the fourth temperature detected by the fourth temperature sensor.

In some embodiments, adjusting the second expansion valve based on the current third temperature difference comprises: determining a third adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current third temperature difference and the third temperature difference when the current third temperature difference is in a seventh range, and controlling the second expansion valve to increase the third adjustment value on the basis of the current opening degree, wherein the seventh range is larger than the upper limit value of the third temperature difference or smaller than the lower limit value of the third temperature difference; alternatively, when the current third temperature difference is within an eighth range, which is a lower limit value of the third temperature difference or more and an upper limit value of the third temperature difference or less, the second expansion valve is controlled to maintain the current opening degree.

In some embodiments, determining the third adjustment value includes: and taking the difference value of the intermediate value between the lower limit value and the upper limit value of the current third temperature difference and the third temperature difference as the third adjustment value.

In some embodiments, the performing dehumidification control further comprises: the first expansion valve is controlled to maintain the opening upper limit.

In some embodiments, the drying apparatus further comprises: the first fan of setting at the condenser sets up the second fan at auxiliary heat exchanger, sets up the third fan at the evaporimeter, carry out temperature rising control still includes: controlling the rotating speed of the first fan and the rotating speed of the second fan to be higher than the rotating speed of the third fan; alternatively, the performing dehumidification control further includes: and controlling the rotating speeds of the third fan and the second fan to be higher than that of the first fan.

Some embodiments of the present disclosure provide a control device of a drying apparatus, including: a memory; and a processor coupled to the memory, the processor configured to perform a control method of the drying apparatus based on the instructions stored in the memory.

Some embodiments of the present disclosure provide a control device of a drying apparatus, including: and a module for executing the control method of the drying device.

Some embodiments of the present disclosure propose a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a control method of a drying apparatus.

Drawings

The drawings that are required for use in the description of the embodiments or the related art will be briefly described below. The present disclosure will be more clearly understood from the following detailed description with reference to the accompanying drawings.

It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without inventive faculty.

Fig. 1 illustrates a schematic diagram of a controlled system of some embodiments of the present disclosure.

Fig. 2 illustrates a schematic diagram of a control method of a drying apparatus according to some embodiments of the present disclosure.

Fig. 3 illustrates a schematic structural view of a control device of a drying apparatus according to some embodiments of the present disclosure.

Fig. 4 illustrates a schematic structural view of a control device of a drying apparatus according to some embodiments of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure.

It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.

It will be appreciated by those of skill in the art that the terms "first," "second," etc. in embodiments of the present disclosure, unless specifically stated otherwise, are used merely to distinguish between different steps, devices, or modules, and do not represent any particular technical meaning nor necessarily logical order between them.

Fig. 1 illustrates a schematic view of a drying apparatus of some embodiments of the present disclosure. The drying device is a closed type drying device.

As shown in fig. 1, the drying apparatus of this embodiment includes: a compressor 1, a condenser 2, a first expansion valve 3, an auxiliary heat exchanger 4, a second expansion valve 5, an evaporator 6, a gas-liquid separator 7, and a control device 8, which are sequentially arranged along the flow direction of the refrigerant; according to control requirements, the device can further comprise a first temperature sensor 10 arranged on the inlet side of the auxiliary heat exchanger 4, and a second temperature sensor 11 arranged on the outlet side of the auxiliary heat exchanger 4; according to the control requirement, it may further include a second temperature sensor 9 disposed at the outlet side of the condenser 2, a pressure sensor 14 disposed at the inlet side of the condenser 2 (or, alternatively, disposed at the discharge side of the compressor 1); according to the control requirement, it may further include a fourth temperature sensor 12 provided at the inlet side of the evaporator 6, a fifth temperature sensor 13 provided at the outlet side of the evaporator 6; according to the control requirement, the evaporator further comprises a first fan 15 arranged at the condenser 2, a second fan 16 arranged at the auxiliary heat exchanger 4 and a third fan 17 arranged at the evaporator 6. The first expansion valve 3 is, for example, a first electronic expansion valve, and the second expansion valve 5 is, for example, a second electronic expansion valve. The second temperature sensor 9 is also called a liquid tube temperature sensor. The pressure sensor 14 is, for example, a sensor suitable for detecting a high pressure on the discharge side of the compressor 1.

The first temperature difference (tΔ1) is the difference between the temperature (tc) obtained by converting the pressure detected by the pressure sensor 14 and the third temperature (tl) detected by the second temperature sensor 9, that is, tΔ1=tc-tl.

The second temperature difference (tΔ2) is the difference between the second temperature (tof) detected by the second temperature sensor 11 and the first temperature (tif) detected by the first temperature sensor 10, that is, tΔ2=tof-tif.

The third temperature difference (tΔ3) is the difference between the fifth temperature (toe) detected by the fifth temperature sensor 13 and the fourth temperature (tie) detected by the fourth temperature sensor 12, that is, tΔ3=toe-tie.

In the operation preparation stage, the drying equipment enters a self-checking stage after receiving a control instruction, if the pressure and the temperature exceed the preset range, the starting is not allowed, after the detection is finished, the fan and the expansion valve perform self-checking, and if no abnormality is detected, the operation is allowed.

In the operation initialization stage of the drying equipment, the compressor, the expansion valves and the fans are put into operation in an initialization setting, and after the initialization operation is performed for a preset time, if the unit is not abnormal, the drying equipment enters a drying control stage.

In some embodiments, the control device 8 is configured to perform the temperature-increasing control and the dehumidification control by adjusting the first expansion valve 3 and the second expansion valve 5 to achieve the drying control. Thus, a drying apparatus is realized based on the expansion valve. In the drying control process, the temperature rising control can be performed first to fully release the moisture in the dried object, and then the dehumidification control can be performed to timely remove the released moisture. The temperature increase control and the dehumidification control may be alternately performed one or more times according to the object to be dried and the drying demand.

The temperature increase control process is described below.

In some embodiments, the control device 8 is configured to adjust the first expansion valve 3 according to the current second temperature difference at the time of the temperature increase control. Therefore, in the heating mode, whether the circulation amount of the refrigerant of the unit needs to be optimized or not is determined according to the current second temperature difference, and then the first expansion valve 3 is adjusted to optimize the circulation amount of the refrigerant of the unit and improve the heating control effect in the drying process.

In some embodiments, the control device 8 is configured to determine the first adjustment value by comparing the current second temperature difference (set as tΔ2) with the intermediate value between the lower limit value (set as d, for example, 4) and the upper limit value (set as c, for example, 10) of the second temperature difference, and to determine the difference between the current second temperature difference and the intermediate value between the lower limit value and the upper limit value of the second temperature difference as the first adjustment value, that is, [ tΔ2- (c+d)/2 ], to control the first expansion valve 3 to increase the first adjustment value, that is, b1+ = [ tΔ2- (c+d)/2 ], on the basis of the current opening (set as B1), and the first range is the upper limit value of the second temperature difference or is smaller than the lower limit value of the second temperature difference, that is, c < tΔ2 or tΔ2 < d, so as to control the first expansion valve 3 to increase the cooling medium circulation in the first expansion mode.

In some embodiments, the control device 8 is configured to control the first expansion valve 3 to maintain the current opening degree without optimizing the unit refrigerant circulation amount temporarily when the current second temperature difference is in a second range, where c is greater than or equal to a lower limit value of the second temperature difference and less than or equal to an upper limit value of the second temperature difference, that is, c is greater than or equal to T Δ2 is greater than or equal to d. The first expansion valve 3 is adjusted to be maintained for a predetermined time, for example, 10 seconds. In the present embodiment, the control device 8 is configured to control the second expansion valve 5 to maintain the opening degree upper limit.

The circulation quantity of the refrigerant can be optimized through the adjustment of the first expansion valve 3, so that the unit can operate more reliably; on the basis, the refrigerant circulation quantity can be further optimized through further adjustment of the second expansion valve 5, so that the unit operates in a high-efficiency state.

In some embodiments, the control device 8 is configured to indicate that the unit refrigerant circulation amount may be further optimized, and the second expansion valve 5 is adjusted according to the current first temperature difference, when the current second temperature difference is in a third range, where the third range is greater than or equal to a sum of a lower limit value and a first value (e.g. 2) of the second temperature difference and less than or equal to a difference between an upper limit value and the first value of the second temperature difference, i.e. c-2 > T Δ2 > d+2. Thereby further optimizing the refrigerant circulation volume of the unit by controlling the second expansion valve 5 and improving the heating control effect in the drying process.

In some embodiments, the control device 8 is configured to determine the second adjustment value by comparing the current first temperature difference (set as tΔ1) with an intermediate value between the lower limit value (set as B) and the upper limit value (set as a) of the first temperature difference, and to control the second expansion valve 5 to increase the second adjustment value, that is, b2+ = [ tΔ1- (a+b)/2 ], based on the current opening degree (set as B2), when the current first temperature difference is within a fourth range, wherein the fourth range is greater than the upper limit value of the first temperature difference or less than the lower limit value of the first temperature difference, that is, B > tΔ1 or tΔ1 > a, so as to further optimize the control effect of the temperature increase of the cooling medium in the unit by controlling the second expansion valve 5.

In some embodiments, the control device 8 is configured to, when the current first temperature difference is in a fifth range, that is, a Σ Σ1 Σb or more, which is equal to or greater than the lower limit value of the first temperature difference and equal to or less than the upper limit value of the first temperature difference, indicate that the unit refrigerant circulation amount is at the boundary of the optimal state, not suggest to adjust, and control the second expansion valve 5 to maintain the current opening degree. The second expansion valve 5 is adjusted to be maintained for a predetermined time, for example, 10 seconds.

In some embodiments, the control device 8 is configured to control the second expansion valve 5 to maintain the current opening degree without suggesting that the adjustment is performed when the current second temperature difference is within a sixth range, where the sixth range is within the second range and is smaller than a sum of a lower limit value of the second temperature difference and a second value (e.g. 1) or greater than a difference between an upper limit value of the second temperature difference and the second value, and the second value is smaller than the first value, i.e. d+1 > tΔ2 or tΔ2 > c-1.

The third range is located in the middle area range among the second range by the setting of the first value, and the sixth range is located in the boundary area range among the second range by the setting of the second value. Thus, those skilled in the art will appreciate that the particular values of the first and second values are not limited to the examples listed above.

In the temperature raising control process, in addition to the temperature raising control by adjusting the first expansion valve 3 and the second expansion valve 5 as described in the above embodiment, the fans may be controlled, the rotational speed of the first fan 15 and the rotational speed of the second fan 16 are controlled to be higher than the rotational speed of the third fan 17, for example, the high gear operation of the first fan 15 and the second fan 16 is controlled, the third fan 17 is controlled to stand by and not act, and the temperature raising effect is further raised.

The dehumidification control process is described below.

In some embodiments, the control device 8 is configured to adjust the second expansion valve 5 according to the current third temperature difference at the time of dehumidification control. Therefore, in the dehumidification mode, whether the refrigerant circulation amount of the unit needs to be optimized or not is determined according to the current third temperature difference, and then the second expansion valve 5 is adjusted to optimize the refrigerant circulation amount of the unit, so that the dehumidification control effect in the drying process is improved.

In some embodiments, the control device 8 is configured to determine the third adjustment value by comparing the current third temperature difference (set as tΔ3) with an intermediate value between the lower limit value (set as f, for example, 4) and the upper limit value (set as e, for example, 10) of the third temperature difference, and to control the second expansion valve 5 to increase the third adjustment value, namely b2+ = [ tΔ3- (e+f)/2 ], on the basis of the current opening degree, when the current third temperature difference is within a seventh range, wherein e < T Δ3 or tΔ3 < f, which is an intermediate value between the lower limit value and the upper limit value of the third temperature difference, is greater than the upper limit value of the third temperature difference, or less than the lower limit value of the third temperature difference, namely, e < T Δ3 or T Δ3 < f, so that in the dehumidification mode, the second expansion valve 5 is controlled to increase the dehumidification effect in the unit during the control of the second expansion valve.

In some embodiments, the control device 8 is configured to control the second expansion valve 5 to maintain the current opening degree when the current third temperature difference is in an eighth range, that is, e is greater than or equal to the lower limit value of the third temperature difference and less than or equal to the upper limit value of the third temperature difference, that is, e is greater than or equal to tΔ3 is greater than or equal to f, which indicates that the unit refrigerant circulation amount is not required to be optimized at the moment. The second expansion valve 5 is adjusted to be maintained for a predetermined time, for example, 10 seconds. In the present embodiment, the control device 8 is configured to control the first expansion valve 3 to maintain the opening degree upper limit.

In the dehumidification control process, in addition to the dehumidification control by adjusting the first expansion valve 3 and the second expansion valve 5 as described in the above embodiment, the fans may be controlled, the rotational speeds of the third fan 17 and the second fan 16 are controlled to be higher than the rotational speed of the first fan 15, for example, the low gear operation of the first fan 15 is controlled, and the high gear operation of the third fan 17 and the second fan 16 is controlled, so that the dehumidification effect is further improved.

In some embodiments, the upper/lower limit a, b, c, d, e, f in the foregoing embodiments is a value that depends on different refrigerants and unit heating amounts, and can be tested by matching, and the value at the time of optimal energy efficiency is determined while the unit operation reliability is satisfied. Thus, those skilled in the art will appreciate that the specific values of a, b, c, d, e, f are not limited to the examples listed above.

The embodiment of the disclosure provides a drying device, which comprises a compressor, a condenser, a first expansion valve, an auxiliary heat exchanger, a second expansion valve, an evaporator, a gas-liquid separator and a control device, wherein the compressor, the condenser, the first expansion valve, the auxiliary heat exchanger, the second expansion valve, the evaporator and the gas-liquid separator are sequentially arranged along the refrigerant flow direction, and the control device is configured to realize drying control by performing temperature rise control and dehumidification control on adjustment of the first expansion valve and the second expansion valve.

In the heating control process, the area of the heat exchanger needs more evaporation area, and the auxiliary heat exchanger works as an evaporator through the control of the expansion valve, so that the larger evaporation area is provided in the heating control process; in the dehumidification control process, the heat exchanger area needs more condensing area, the auxiliary heat exchanger works as a condenser through the control of the expansion valve, and the auxiliary heat exchanger radiates heat together with the condenser, so that the larger condensing area is provided in the dehumidification control process. Therefore, in the drying control process, the temperature rising control and the dehumidification control can be flexibly switched through the control of the expansion valve, and the actual evaporation area and the condensation area of the unit can be flexibly changed. The (closed) drying equipment of the embodiment of the disclosure solves the business requirements that the drying equipment needs a larger evaporation area when heating up and a larger condensation area when dehumidifying through a simple structure.

And, three heat exchangers exist in series, wherein condenser, evaporimeter keep working, and auxiliary heat exchanger also changes and keeps working in condensing/evaporation two, can not have the fluid to store up the condition, and the reliability is higher.

As shown in fig. 2, the control method of the drying apparatus of this embodiment includes: the temperature raising control (step S21) and the dehumidification control (step S22) are performed by adjusting the first expansion valve 3 and the second expansion valve 5 to realize the drying control.

In some embodiments, performing temperature increase control of step S21 includes: in step S211, the first expansion valve 3 is adjusted according to the current second temperature difference, which is the difference between the second temperature detected by the second temperature sensor 11 and the first temperature detected by the first temperature sensor 10.

In some embodiments, adjusting the first expansion valve 3 according to the current second temperature difference of step S211 comprises: in step S211a, when the current second temperature difference is in the first range, determining a first adjustment value by comparing the current second temperature difference with an intermediate value between a lower limit value and an upper limit value of the second temperature difference, and controlling the first expansion valve 3 to increase the first adjustment value based on the current opening degree by using a difference value of the current second temperature difference with the intermediate value between the lower limit value and the upper limit value of the second temperature difference as the first adjustment value, wherein the first range is an upper limit value greater than the second temperature difference or a lower limit value less than the second temperature difference; alternatively, in step S211b, when the current second temperature difference is within a second range, which is a lower limit value of the second temperature difference or more and an upper limit value of the second temperature difference or less, the first expansion valve 3 is controlled to maintain the current opening degree.

In some embodiments, performing the temperature increase control of step S21 further includes: in step S212, when the current second temperature difference is in the third range and the first expansion valve 3 is not operated for the first period, the second expansion valve 5 is adjusted according to the current first temperature difference, where the third range is located in the second range and is greater than or equal to the sum of the lower limit value of the second temperature difference and the first value and less than or equal to the difference between the upper limit value of the second temperature difference and the first value, and the first temperature difference is the difference between the temperature obtained by converting the pressure detected by the pressure sensor 14 and the third temperature detected by the second temperature sensor 9.

In some embodiments, adjusting the second expansion valve 5 according to the current first temperature difference of step S212 includes: in step S212a, when the current first temperature difference is in a fourth range, determining a second adjustment value by comparing an intermediate value between the current first temperature difference and a lower limit value and an upper limit value of the first temperature difference, and controlling the second expansion valve 5 to increase the second adjustment value based on the current opening degree by using a difference value of the intermediate value between the current first temperature difference and the lower limit value and the upper limit value of the first temperature difference as the second adjustment value, wherein the fourth range is larger than the upper limit value of the first temperature difference or smaller than the lower limit value of the first temperature difference; alternatively, in step S212b, when the current first temperature difference is in a fifth range, which is a lower limit value of the first temperature difference or more and an upper limit value of the first temperature difference or less, the second expansion valve 5 is controlled to maintain the current opening degree.

In some embodiments, performing the temperature increase control of step S21 further includes: in step S213, when the current second temperature difference is in a sixth range, the second expansion valve 5 is controlled to maintain the current opening, wherein the sixth range is within the second range and is smaller than the sum of the lower limit value of the second temperature difference and the second value or larger than the difference between the upper limit value of the second temperature difference and the second value, and the second value is smaller than the first value.

In some embodiments, performing the temperature increase control of step S21 further includes: when steps S211a and S211b are performed, step S214 is performed to control the second expansion valve 5 to maintain the upper limit of the opening degree.

In some embodiments, performing the temperature increase control of step S21 further includes: in step S215, the rotational speed of the first fan 15 and the rotational speed of the second fan 16 are controlled to be higher than the rotational speed of the third fan 17. Step 213 may be performed simultaneously with steps 211 and 212.

In some embodiments, the performing dehumidification control of step S22 includes: in step S221, the second expansion valve 5 is adjusted according to the current third temperature difference, wherein the third temperature difference is a difference between the fifth temperature detected by the fifth temperature sensor 13 and the fourth temperature detected by the fourth temperature sensor 12.

In some embodiments, adjusting the second expansion valve 5 according to the current third temperature difference of step S221 includes: in step S221a, when the current third temperature difference is in a seventh range, determining a third adjustment value by comparing the current third temperature difference with an intermediate value between a lower limit value and an upper limit value of the third temperature difference, and controlling the second expansion valve 5 to increase the third adjustment value based on the current opening degree by using a difference value of the current third temperature difference with the intermediate value between the lower limit value and the upper limit value of the third temperature difference as the third adjustment value, wherein the seventh range is greater than the upper limit value of the third temperature difference or less than the lower limit value of the third temperature difference; alternatively, in step S221b, when the current third temperature difference is in the eighth range, which is the lower limit value of the third temperature difference or more and the upper limit value of the third temperature difference or less, the second expansion valve 5 is controlled to maintain the current opening degree.

In some embodiments, the performing dehumidification control of step S22 further includes: in step S222, the first expansion valve 3 is controlled to maintain the upper limit of the opening degree. Step S222 and step S221 may be performed simultaneously.

In some embodiments, the performing dehumidification control of step S22 includes: in step S223, the rotational speeds of the third fan 17 and the second fan 16 are controlled to be higher than the rotational speed of the first fan 15. Step S223 and steps S221 and S222 may be performed simultaneously.

In the heating control process, the area of the heat exchanger needs more evaporation area, and the auxiliary heat exchanger works as an evaporator through the control of the expansion valve, so that the larger evaporation area is provided in the heating control process; in the dehumidification control process, the heat exchanger area needs more condensing area, the auxiliary heat exchanger works as a condenser through the control of the expansion valve, and the auxiliary heat exchanger radiates heat together with the condenser, so that the larger condensing area is provided in the dehumidification control process. Therefore, in the drying control process, the temperature rising control and the dehumidification control can be flexibly switched through the control of the expansion valve, and the actual evaporation area and the condensation area of the unit can be flexibly changed.

As shown in fig. 3, the control device 300 of the drying apparatus of this embodiment includes: a memory 310 and a processor 320 coupled to the memory 310, the processor 320 being configured to perform the method of any of the foregoing embodiments based on instructions stored in the memory 310.

The control device 300 of the drying apparatus may further include an input/output interface 330, a network interface 340, a storage interface 350, and the like. These interfaces 330, 340, 350 and the memory 310 and the processor 320 may be connected, for example, by a bus 360.

The memory 310 may include, for example, system memory, fixed nonvolatile storage media, and the like. The system memory stores, for example, an operating system, application programs, boot Loader (Boot Loader), and other programs.

Processor 320 may be implemented as discrete hardware components such as a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA), or other programmable logic device, discrete gates, or transistors.

The input/output interface 330 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, a touch screen, and the like. Network interface 340 provides a connection interface for various networking devices. Storage interface 350 provides a connection interface for external storage devices such as SD cards, U-discs, and the like. Bus 360 can employ any of a variety of bus architectures. For example, bus structures include, but are not limited to, an industry standard architecture (Industry Standard Architecture, ISA) bus, a micro channel architecture (Micro Channel Architecture, MCA) bus, and a peripheral component interconnect (Peripheral Component Interconnect, PCI) bus.

As shown in fig. 4, the control device 400 of the drying apparatus of this embodiment is configured to implement drying control by performing temperature-raising control and dehumidification control on the adjustment of the first expansion valve 3 and the second expansion valve 5.

The control apparatus 400 of the drying device includes a temperature elevation control module 410 and a dehumidification control module 420.

The temperature increase control module 410 includes: the first temperature increase control unit 411 is configured to adjust the first expansion valve 3 according to a current second temperature difference, wherein the second temperature difference is a difference between the second temperature detected by the second temperature sensor 11 and the first temperature detected by the first temperature sensor 10.

A first temperature increase control unit 411 configured to determine a first adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of a current second temperature difference and a second temperature difference, and control the first expansion valve 3 to increase the first adjustment value on the basis of a current opening degree, with a difference value of the intermediate value between the lower limit value and the upper limit value of the current second temperature difference as the first adjustment value, the first range being an upper limit value greater than the second temperature difference or a lower limit value less than the second temperature difference; alternatively, when the current second temperature difference is in the second range, which is the lower limit value of the second temperature difference or more and the upper limit value of the second temperature difference or less, the first expansion valve 3 is controlled to maintain the current opening degree.

The first temperature increase control unit 411 is further configured to control the second expansion valve 5 to maintain the opening upper limit.

The temperature increase control module 410 includes: and a second temperature increase control unit 412 configured to adjust the second expansion valve 5 according to a current first temperature difference when the current second temperature difference is in a third range that is within the second range and that is equal to or greater than a sum of a lower limit value of the second temperature difference and a first value and equal to or less than a difference between an upper limit value of the second temperature difference and the first value, and the first expansion valve 3 is not operated for a first period of time, the first temperature difference being a difference between a temperature obtained by converting the pressure detected by the pressure sensor 14 and a third temperature detected by the second temperature sensor 9.

A second temperature increase control unit 412 configured to determine a second adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current first temperature difference and the first temperature difference, and control the second expansion valve 5 to increase the second adjustment value on the basis of the current opening degree, with a difference value of the intermediate value between the lower limit value and the upper limit value of the current first temperature difference as the second adjustment value, in a case where the current first temperature difference is in a fourth range, the fourth range being greater than the upper limit value of the first temperature difference or less than the lower limit value of the first temperature difference; alternatively, when the current first temperature difference is in a fifth range, which is a lower limit value of the first temperature difference or more and an upper limit value of the first temperature difference or less, the second expansion valve 5 is controlled to maintain the current opening degree.

The temperature increase control module 410 includes: the third temperature increase control unit 413 is configured to control the second expansion valve 5 to maintain the current opening degree in a case where the current second temperature difference is in a sixth range, wherein the sixth range is located in the second range and is smaller than a sum of a lower limit value of the second temperature difference and a second value or larger than a difference between an upper limit value of the second temperature difference and the second value, and the second value is smaller than the first value.

The temperature increase control module 410 includes: the fourth temperature increase control unit 414 is configured to control the rotational speed of the first fan 15 and the rotational speed of the second fan 16 to be higher than the rotational speed of the third fan 17. Step 213 may be performed simultaneously with steps 211 and 212.

The dehumidification control module 420 is configured to adjust the second expansion valve 5 according to a current third temperature difference, wherein the third temperature difference is a difference between a fifth temperature detected by the fifth temperature sensor 13 and a fourth temperature detected by the fourth temperature sensor 12.

The dehumidification control module 420 includes a first dehumidification control unit 421 configured to determine a third adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current third temperature difference and the third temperature difference, and control the second expansion valve 5 to increase the third adjustment value on the basis of the current opening degree, with a difference value of the intermediate value between the lower limit value and the upper limit value of the current third temperature difference as the third adjustment value, in a case where the current third temperature difference is in a seventh range, the seventh range being greater than the upper limit value of the third temperature difference or less than the lower limit value of the third temperature difference; alternatively, when the current third temperature difference is in an eighth range, which is a lower limit value of the third temperature difference or more and an upper limit value of the third temperature difference or less, the second expansion valve 5 is controlled to maintain the current opening degree.

The dehumidification control module 420 includes a second dehumidification control unit 422 configured to control the first expansion valve 3 to maintain an upper limit of opening.

The dehumidification control module 420 includes a third dehumidification control unit 423 configured to control rotational speeds of the third fan 17 and the second fan 16 to be higher than rotational speeds of the first fan 15.

The disclosed embodiments propose a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of a control method of a drying apparatus.

It will be appreciated by those skilled in the art that embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more non-transitory computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer program code embodied therein.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The foregoing description of the preferred embodiments of the present disclosure is not intended to limit the disclosure, but rather to enable any modification, equivalent replacement, improvement or the like, which fall within the spirit and principles of the present disclosure.

Claims

1. A drying apparatus, characterized by comprising:

A compressor (1), a condenser (2), a first expansion valve (3), an auxiliary heat exchanger (4), a second expansion valve (5), an evaporator (6) and a gas-liquid separator (7) which are sequentially arranged along the refrigerant flow direction, and a control device (8),

the control device (8) is configured to perform temperature rise control and dehumidification control by adjusting the first expansion valve (3) and the second expansion valve (5) to achieve drying control.

2. The drying apparatus according to claim 1, further comprising:

a first temperature sensor (10) arranged at the inlet side of the auxiliary heat exchanger (4),

a second temperature sensor (11) arranged on the outlet side of the auxiliary heat exchanger (4),

the control device (8) is configured to adjust the first expansion valve (3) according to the current second temperature difference during the temperature rise control,

wherein the second temperature difference is the difference between the second temperature detected by the second temperature sensor (11) and the first temperature detected by the first temperature sensor (10).

3. Drying apparatus according to claim 2, characterized in that said control means (8) are configured to:

determining a first adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current second temperature difference and the second temperature difference when the current second temperature difference is in a first range, and controlling the first expansion valve (3) to increase the first adjustment value on the basis of the current opening degree, wherein the first range is larger than the upper limit value of the second temperature difference or smaller than the lower limit value of the second temperature difference; or,

When the current second temperature difference is within a second range, which is a lower limit value of the second temperature difference or more and an upper limit value of the second temperature difference or less, the first expansion valve (3) is controlled to maintain the current opening degree.

4. A drying apparatus according to claim 3, characterized in that the control means (8) are configured to: and taking the difference value of the intermediate value between the lower limit value and the upper limit value of the current second temperature difference and the second temperature difference as the first adjustment value.

5. The drying apparatus according to claim 3, further comprising:

a third temperature sensor (9) provided on the outlet side of the condenser (2),

a pressure sensor (14) provided on the inlet side of the condenser (2),

the control device (8) is configured to: when the current second temperature difference is in a third range and the first expansion valve (3) is not operated for a first period of time, the second expansion valve (5) is regulated according to the current first temperature difference,

the third range is located in the second range, and is larger than or equal to the sum of the lower limit value of the second temperature difference and the first value, and smaller than or equal to the difference between the upper limit value of the second temperature difference and the first value, and the first temperature difference is the difference between the temperature obtained by converting the pressure detected by the pressure sensor (14) and the third temperature detected by the third temperature sensor (9).

6. Drying apparatus according to claim 5, characterized in that said control means (8) are configured to:

determining a second adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current first temperature difference and the first temperature difference when the current first temperature difference is in a fourth range, and controlling the second expansion valve (5) to increase the second adjustment value on the basis of the current opening degree, wherein the fourth range is larger than the upper limit value of the first temperature difference or smaller than the lower limit value of the first temperature difference; or,

when the current first temperature difference is within a fifth range, which is a lower limit value of the first temperature difference or more and an upper limit value of the first temperature difference or less, the second expansion valve (5) is controlled to maintain the current opening degree.

7. Drying apparatus according to claim 6, characterized in that said control means (8) are configured to: and taking the difference value of the intermediate value between the current first temperature difference and the lower limit value and the upper limit value of the first temperature difference as the second adjustment value.

8. Drying apparatus according to claim 5, characterized in that said control means (8) are configured to: when the current second temperature difference is in the sixth range, the second expansion valve (5) is controlled to maintain the current opening degree,

The sixth range is located in the second range, and is smaller than the sum of the lower limit value of the second temperature difference and the second value or larger than the difference between the upper limit value of the second temperature difference and the second value, and the second value is smaller than the first value.

9. A drying apparatus according to claim 3 or 4, characterized in that the control means (8) are configured to: the second expansion valve (5) is controlled to maintain the upper limit of the opening degree.

10. The drying apparatus according to any one of claims 1 to 8, further comprising:

a fourth temperature sensor (12) provided on the inlet side of the evaporator (6),

a fifth temperature sensor (13) provided on the outlet side of the evaporator (6),

the control device (8) is configured to adjust the second expansion valve (5) according to the current third temperature difference during dehumidification control,

wherein the third temperature difference is a difference between the fifth temperature detected by the fifth temperature sensor (13) and the fourth temperature detected by the fourth temperature sensor (12).

11. Drying apparatus according to claim 10, characterized in that said control means (8) are configured to:

determining a third adjustment value by comparing an intermediate value between a lower limit value and an upper limit value of the current third temperature difference and the third temperature difference when the current third temperature difference is in a seventh range, and controlling the second expansion valve (5) to increase the third adjustment value on the basis of the current opening degree, wherein the seventh range is larger than the upper limit value of the third temperature difference or smaller than the lower limit value of the third temperature difference; or,

When the current third temperature difference is within an eighth range, which is a lower limit value of the third temperature difference or more and an upper limit value of the third temperature difference or less, the second expansion valve (5) is controlled to maintain the current opening degree.

12. Drying apparatus according to claim 11, characterized in that said control means (8) are configured to: and taking the difference value of the intermediate value between the lower limit value and the upper limit value of the current third temperature difference and the third temperature difference as the third adjustment value.

13. Drying apparatus according to claim 10, characterized in that said control means (8) are configured to: the first expansion valve (3) is controlled to maintain the upper limit of the opening degree.

14. The drying apparatus according to any one of claims 1 to 8, further comprising:

a first fan (15) arranged on the condenser (2),

a second fan (16) arranged on the auxiliary heat exchanger (4),

a third fan (17) arranged on the evaporator (6),

the control device (8) is configured to: during temperature rise control, the rotating speed of the first fan (15) and the rotating speed of the second fan (16) are controlled to be higher than the rotating speed of the third fan (17); or, in the dehumidification control, the rotation speed of the third fan (17) and the second fan (16) is controlled to be higher than that of the first fan (15).

15. A control method of a drying apparatus, characterized in that the drying apparatus comprises: a compressor (1), a condenser (2), a first expansion valve (3), an auxiliary heat exchanger (4), a second expansion valve (5), an evaporator (6) and a gas-liquid separator (7) which are sequentially arranged along the refrigerant flow direction, and a control device (8),

the method comprises the following steps: the temperature rise control and the dehumidification control are carried out through the adjustment of the first expansion valve (3) and the second expansion valve (5), so that the drying control is realized.

16. The method of claim 15, wherein the drying apparatus further comprises: a first temperature sensor (10) provided on the inlet side of the auxiliary heat exchanger (4), a second temperature sensor (11) provided on the outlet side of the auxiliary heat exchanger (4),

the temperature increase control includes: the first expansion valve (3) is regulated as a function of a current second temperature difference, wherein the second temperature difference is the difference between the second temperature detected by the second temperature sensor (11) and the first temperature detected by the first temperature sensor (10).

17. The method according to claim 16, wherein adjusting the first expansion valve (3) according to the current second temperature difference comprises:

18. The method of claim 17, wherein determining the first adjustment value comprises: and taking the difference value of the intermediate value between the lower limit value and the upper limit value of the current second temperature difference and the second temperature difference as the first adjustment value.

19. The method of claim 17, wherein the drying apparatus further comprises: a third temperature sensor (9) provided on the outlet side of the condenser (2), a pressure sensor (14) provided on the inlet side of the condenser (2),

the temperature increase control includes: when the current second temperature difference is in a third range and the first expansion valve (3) is not operated for a first period of time, the second expansion valve (5) is regulated according to the current first temperature difference,

20. The method according to claim 19, wherein adjusting the second expansion valve (5) according to the current first temperature difference comprises:

21. The method of claim 20, wherein determining the second adjustment value comprises: and taking the difference value of the intermediate value between the current first temperature difference and the lower limit value and the upper limit value of the first temperature difference as the second adjustment value.

22. The method of claim 19, wherein the performing temperature increase control comprises: when the current second temperature difference is in the sixth range, the second expansion valve (5) is controlled to maintain the current opening degree,

23. The method according to claim 17 or 18, wherein the performing temperature increase control further includes: the second expansion valve (5) is controlled to maintain the upper limit of the opening degree.

24. The method according to any one of claims 15 to 22, wherein the drying apparatus further comprises: a fourth temperature sensor (12) provided on the inlet side of the evaporator (6), a fifth temperature sensor (13) provided on the outlet side of the evaporator (6),

the performing dehumidification control includes: the second expansion valve (5) is regulated as a function of a current third temperature difference, wherein the third temperature difference is the difference between a fifth temperature detected by a fifth temperature sensor (13) and a fourth temperature detected by a fourth temperature sensor (12).

25. Method according to claim 24, wherein adjusting the second expansion valve (5) according to the current third temperature difference comprises:

26. The method of claim 25, wherein determining a third adjustment value comprises: and taking the difference value of the intermediate value between the lower limit value and the upper limit value of the current third temperature difference and the third temperature difference as the third adjustment value.

27. The method of claim 24, wherein said performing dehumidification control further comprises: the first expansion valve (3) is controlled to maintain the upper limit of the opening degree.

28. The method according to any one of claims 15 to 22, wherein the drying apparatus further comprises: a first fan (15) arranged on the condenser (2), a second fan (16) arranged on the auxiliary heat exchanger (4), a third fan (17) arranged on the evaporator (6),

the temperature increase control further includes: controlling the rotation speed of the first fan (15) and the rotation speed of the second fan (16) to be higher than the rotation speed of the third fan (17); or,

the dehumidification control further includes: the rotation speed of the third fan (17) and the second fan (16) is controlled to be higher than that of the first fan (15).

29. A control device of a drying apparatus, comprising:

a memory; and

a processor coupled to the memory, the processor configured to execute the control method of the drying apparatus of any one of claims 15-28 based on instructions stored in the memory.

30. A control device of a drying apparatus, comprising: a module for performing the control method of the drying apparatus according to any one of claims 15 to 28.

31. A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the control method of the drying appliance of any one of claims 15-28.