CN112413751B - Dehumidifier air duct system and air valve control method thereof - Google Patents

Dehumidifier air duct system and air valve control method thereof Download PDF

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Publication number
CN112413751B
CN112413751B CN202011043873.2A CN202011043873A CN112413751B CN 112413751 B CN112413751 B CN 112413751B CN 202011043873 A CN202011043873 A CN 202011043873A CN 112413751 B CN112413751 B CN 112413751B
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air
dehumidifier
air valve
cavity
opening degree
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CN112413751A (en
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王星
罗明
陈�峰
廖悦
方乐儒
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Guangzhou Fenni Swimming Pool Equipment Technology Co ltd
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Guangzhou Fenni Swimming Pool Equipment Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Drying Of Gases (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a dehumidifier air duct system, which relates to the technical field of dehumidification and comprises a dehumidifier body with a hollow structure, wherein an air cavity is formed in the dehumidifier body, and an air inlet and an air outlet are respectively arranged at two opposite ends of the dehumidifier body and are communicated with the air cavity; in the ventilation direction of the dehumidifier body, the evaporator and the condenser are arranged in the air cavity in sequence; the first air valve is arranged between the evaporator and the condenser, and the dehumidifier is switched between different working modes by adjusting the opening degree of the first air valve, so that the internal frosting of the dehumidifier is avoided, and the dehumidification efficiency is improved. The invention also discloses a dehumidifier air valve control method, which is used for detecting the inlet air temperature of the air inlet and the low pressure of a heat pump system connected with the evaporator and the condenser in real time to obtain a corresponding temperature value T and a corresponding pressure value P, and timely adjusting the first air valve according to the temperature value and the pressure value to avoid frosting of the dehumidifier and improve the dehumidification efficiency.

Description

Dehumidifier air duct system and air valve control method thereof
Technical Field
The invention relates to the technical field of dehumidification, in particular to a dehumidifier air duct system and an air valve control method thereof.
Background
A heat pump dehumidification dryer utilizes outside air as a heat source, adopts the principle of being like an air conditioner reversely installed, dry air is in closed circulation between a drying chamber and the heat pump dryer, a refrigeration system of the heat pump dryer is utilized to cool and dehumidify wet air from the drying chamber, when the wet air flows through a heat pump evaporator, an internal low-pressure refrigerant absorbs heat of the air and changes from a liquid state to a gaseous state, and most of condensed water in the air is discharged due to cooling.
The existing heat pump dehumidification dryers can be generally classified into two air duct types according to the sensible heat function:
a first type of air duct: the air flow energy of the air channel flows from one end to the other end smoothly, the air channel has small smooth wind resistance, is not easy to frost and has large operable temperature range, but the dehumidification energy efficiency of the unit is low;
a second air duct: the air duct with the sensible heat exchanger is arranged in the main air duct, the air flow resistance of the circuitous air duct is large, the air duct has high dehumidification energy efficiency, but the air duct is very easy to frost due to the large wind resistance, and the operational temperature interval is small.
Disclosure of Invention
One of the purposes of the embodiment of the invention is as follows: the dehumidifier air duct system is provided, which can solve the problems in the prior art, avoid the frosting of an evaporator and improve the dehumidification efficiency;
the second purpose of the embodiment of the invention is: a dehumidifier air valve control method is characterized in that the opening degree of a first air valve between an evaporator and a condenser is adjusted in real time based on the inlet air temperature or the pressure value of a low-pressure end in a heat pump system, so that the dehumidification efficiency of a dehumidifier is improved on the premise that the evaporator is ensured not to frost.
In order to achieve one of the purposes, the invention adopts the following technical scheme:
a dehumidifier air duct system comprises a dehumidifier body with a hollow structure, wherein an air cavity is formed in the dehumidifier body, and an air inlet and an air outlet are respectively formed at two opposite ends of the dehumidifier body and are communicated with the air cavity; in the ventilation direction of the dehumidifier body, the evaporator and the condenser are sequentially arranged in the air cavity; the first damper is disposed between the evaporator and the condenser.
Furthermore, an air return chamber, an air exhaust chamber and a fresh air chamber which are sequentially communicated are formed on one side of the air cavity, which is close to the air inlet, the air inlet is arranged in the air return chamber, and the fresh air chamber is communicated with the air cavity.
Furthermore, a second air valve capable of selectively communicating the exhaust chamber and the fresh air chamber is arranged between the exhaust chamber and the fresh air chamber.
In order to achieve the second purpose, the invention adopts the following technical scheme:
a dehumidifier air valve control method comprises the dehumidifier air duct system, and comprises the following steps:
s10, detecting the inlet air temperature of the air inlet in real time, and the low-pressure of a heat pump system connected with the evaporator (21) and the condenser (31) to obtain a corresponding temperature value T and a corresponding pressure value P;
s20, adjusting the first air valve (12) in real time based on the detected temperature value or pressure value to enable the dehumidifier to switch between different working modes, wherein the opening degree of the first air valve (12) is inversely proportional to the temperature value or the pressure value.
Further, the operation mode of the dehumidifier includes:
a bypass mode: when the temperature value is detected to be higher than a preset first upper limit value Tn, or when the pressure value is detected to be higher than a preset second upper limit value Pn, the opening degree of the first air valve (12) is 0%;
mixed mode: when the temperature value is lower than or equal to a first upper limit value Tn and higher than a preset first lower limit value T1, or when the pressure value is lower than or equal to a preset second upper limit value Pn and higher than a preset second lower limit value P1, the opening degree of the first air valve (12) is 10% -90%;
a through mode: when the temperature value is lower than or equal to a preset first lower limit value T1 or when the pressure value is lower than or equal to a preset second lower limit value P1, the opening degree of the first air valve (12) is 100%.
Further, the first upper limit Tn is 18 ℃ and the first lower limit T1 is 13 ℃.
Further, the mixed modes respectively comprise a plurality of states, and each state corresponds to a different temperature range and the opening degree of the first air valve (12).
Further, the mixing modes respectively comprise a plurality of states, and each state corresponds to a different pressure range and the opening degree of the first air valve (12).
Further, the calculation formula of the pressure range and the first air valve opening degree in the mixed mode is as follows:
state 1: p is more than P1 and less than or equal to P2, and the opening degree is as follows: k 1;
state 2: p is more than P2 and less than or equal to P3, and the opening degree is as follows: k 2;
……
state (n-1): p (n-1) < P ≦ Pn, opening degree: kn;
wherein P1+ Δ = P2, P2+ Δ = P3 … … P (n-1) + Δ = Pn, Δ = (Pn-P1)/(n-2);
k1＜k2＜……＜kn；
k1 and k2 … … kn are opening values corresponding to the first air valve in the mixed mode, n-1 is the state number of the mixed mode, P1 and P2 … … Pn are pressure values, and delta is the difference value between any two adjacent pressure values.
Further, the difference between the second upper limit Pn and the second lower limit P1 is 0.1MPa, n = 6.
The invention has the beneficial effects that:
1. according to the dehumidifier air valve control method, the first air valve capable of being selectively opened and closed is arranged between the evaporator and the condenser, after an inlet air temperature value T and a heat pump low-pressure value P are obtained, the opening degree of the first air valve is controlled in real time based on the temperature value or the pressure value, the opening degree of the first air valve is reduced under the condition of higher inlet air temperature or higher pressure value, so that air flow is more fully subjected to heat exchange with the evaporator, the pressure value is correspondingly increased, the dehumidification efficiency is improved, the opening degree of the first air valve is increased under the condition of lower inlet air temperature or lower pressure value, so that the air flow is more quickly led to the condenser from the evaporator, and the evaporator is prevented from frosting;
2. compared with a second air duct in the background art, the air duct system has the advantages that the problem that an evaporator is easy to frost is avoided, the condition that a dehumidifier stops running a heat pump system to defrost after frost is accumulated to a certain degree is further avoided, and the safe running of a unit is also ensured; compared with the first type of air duct in the background art, the air duct can control the circuitous time of the air flow at one side of the evaporator through the first air valve, and the evaporator cannot be stopped due to frosting, so that the dehumidifier is ensured to be kept in a continuous operation state, and the dehumidification efficiency is improved.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
FIG. 1 is a schematic view of an air duct system of a dehumidifier according to the present invention (the first air valve is fully opened);
fig. 2 is a second schematic view (the first air valve is half open or closed) of the air duct system of the dehumidifier of the present invention.
In the figure: 10. a dehumidifier body; 11. a wind cavity; 111. a ventilation bypass; 112. a partition plate; 12. a first air valve; 20. a first cavity; 21. an evaporator; 22. a sensible heat exchanger; 23. a first circuitous air duct; 24. a second circuitous air duct; 25. a third circuitous air duct; 26. an air return chamber; 27. an exhaust chamber; 28. a fresh air chamber; 281. a second air valve; 30. a second cavity; 31. a condenser; 32. and (5) a surface cooler.
Detailed Description
In order to make the technical problems solved, technical solutions adopted, and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention are described in further detail below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1-2, in order to avoid the frosting of the internal evaporator 21 of the dehumidifier and ensure a high dehumidification efficiency, the present embodiment provides an air duct system of the dehumidifier, which makes the internal evaporator 21 of the dehumidifier not easily frosted and can improve the dehumidification efficiency as much as possible by improving the air duct structure of the dehumidifier. The dehumidifier air duct system adopts the dehumidifier air valve control method, and comprises a dehumidifier body 10 with a hollow structure, wherein an air cavity 11 for air supply to pass through is formed in the dehumidifier body 10, an air inlet and an air outlet which are communicated with the air cavity 11 are respectively arranged at two opposite ends of the dehumidifier body 10, the air inlet is used for introducing indoor return air and/or outdoor fresh air into the air cavity 11, and the air outlet is generally connected with a drying chamber and is used for continuously providing dry air flow for the drying chamber.
The wind cavity is divided into a first cavity 20 and a second cavity 30 by the first wind valve 12, the first wind valve 12 is arranged in the wind cavity 11, and the first cavity 20 and the second cavity 30 can be selectively communicated by the first wind valve 12 in an opening and closing mode. Be provided with evaporimeter 21 in the first cavity 20, evaporimeter 21 is used for carrying out the heat exchange with letting in first cavity 20 humid air, let its condensation cooling dehumidification, moisture after the dehumidification can fall into first cavity 20 bottom and is discharged or store, second cavity 30 is provided with condenser 31, condenser 31 can let the dry cold air after the cooling dehumidification heat up, in order to let it heat to the comparatively comfortable temperature exhaust wind chamber 11 of human body, wherein first blast gate 12 is arranged in between evaporimeter 21 and condenser 31, be used for adjusting the flow of the direct air current that leads to the second cavity 30 of first cavity 20, reach the effect of the abundant heat transfer of above-mentioned control air current dwell time in first cavity 20.
In order to achieve the effect of continuously outputting the dry airflow by the dehumidifier and ensure the continuous operation state of the dehumidifier, a normally open ventilation bypass 111 is connected between the first cavity 20 and the second cavity 30, and the airflow directions between the first cavity 20, the ventilation bypass 111, the first air valve 12 and the second cavity 30 are all explained in the above air valve control method scheme, and are not described in detail herein.
Dehumidifier air duct system still includes the compressor of being connected with evaporimeter 21 and condenser 31, the return-air port of compressor is provided with pressure sensor, pressure sensor is used for acquireing the pressure value of compressor return-air port, the singlechip controller accessible acquires corresponding pressure value, turn into the first blast gate 12 aperture control signal that corresponds with it with the pressure value signal, and give the blast gate executor with this control signal transmission, after the blast gate executor received the instruction of controller, thereby adjust the dehumidification volume of unit through the aperture of adjusting first blast gate 12, when satisfying high-efficient dehumidification, can guarantee again that the unit is difficult for frosting, guarantee the safer operation of unit.
The first cavity 20 is further provided with a sensible heat exchanger 22, the sensible heat exchanger 22 is disposed between the air inlet and the evaporator 21 and is respectively communicated with the air inlet and the evaporator 21, the sensible heat exchanger 22 is used for performing equal-humidity cooling on the humid air introduced into the first cavity 20 to achieve the effect of precooling the humid air, and the humid air passes through the sensible heat exchanger 22.
In order to adjust the temperature of the air outlet and make the dry air discharged by the air outlet reach the temperature preset by a user, a surface air cooler 32 is further arranged in the second cavity 30, the surface air cooler 32 is arranged between the condenser 31 and the air outlet, a heat medium or a cooling medium or a refrigerating medium in the surface air cooler 32 can flow through the inner cavity of the metal pipeline, and the air to be processed flows through the outer wall of the metal pipeline to carry out heat exchange so as to achieve the purpose of heating or cooling the air.
Specifically, in order to further improve the dehumidification efficiency of the dehumidifier, a first roundabout air duct 23 is formed between the evaporator 21 and the first air valve 12 at intervals, a second roundabout air duct 24 is formed between the evaporator 21 and the side wall of the air cavity 11 at intervals, a third roundabout air duct 25 is formed between the sensible heat exchanger 22 and the side wall of the air cavity 11, and the first roundabout air duct 23, the second roundabout air duct 24, the third roundabout air duct 25 and the ventilation bypass 111 are sequentially communicated to form an annular air duct structure.
When the first air valve 12 is in an open state, the air flow is pre-cooled by the sensible heat exchanger 22 and then flows through the evaporator 21 for secondary cooling and dehumidification, and then directly flows from the first air valve 12 to the second cavity 30, and when the first air valve 12 is in a half-open or closed state, part or all of the air flow flows through heat exchange with the evaporator 21, and then flows from the first bypass air duct 23 and the second bypass air duct 24 to the third bypass air duct 25, and exchanges heat with the air which is not pre-cooled and cooled in the sensible heat exchanger 22 in the third bypass air duct 25, so that the effect of preheating the cooled and dehumidified air is achieved, and then the air flow flows from the ventilation bypass 111 to the second cavity 30 for heat exchange and temperature rise with the condenser 31.
In order to avoid that the cold air in the first roundabout air duct 23 directly flows from the first roundabout air duct 23 to the ventilation bypass 111 when the first air valve 12 is in a half-open or closed state, a partition plate 112 is disposed at one end of the first roundabout air duct 23 away from the second roundabout air duct 24, the ventilation bypass 111 is formed between the partition plate 112 and the inner wall of the air cavity 11, and a first end and a second end of the ventilation bypass 111 are respectively communicated with the third roundabout air duct 25 and the second cavity 30.
An air return chamber 26 is further arranged at one end of the first cavity 20 far away from the second cavity 30, an air return opening for sucking indoor return air is arranged on the air return chamber 26, the evaporator 21 is arranged between the air return chamber 26 and the first air valve 12, a temperature sensor is arranged in the air return chamber 26 and used for acquiring a return air temperature value in the air return chamber 26, the single chip microcomputer controller can acquire a corresponding temperature value, convert a temperature value signal into a corresponding opening degree control signal of the first air valve 12 and transmit the control signal to the air valve actuator, after the air valve actuator receives an instruction of the controller, the dehumidification amount of the unit is adjusted by adjusting the opening degree of the first air valve 12, the high-efficiency dehumidification is met, the unit is ensured not to frost easily, the unit is ensured to run safely, the return air temperature is monitored by arranging the temperature sensor, compared with the monitoring of a pressure value at a low-pressure end by arranging the pressure sensor, the universality is higher, but the precision is relatively lower than that of the control of the pressure sensor.
The first cavity 20 has a fresh air chamber 28 at one end thereof facing the second cavity 30, the fresh air chamber 28 is provided with a fresh air inlet for sucking fresh air from the outside, and the fresh air chamber 28 is disposed between the air return chamber 26 and the evaporator 21.
An exhaust chamber 27 is further arranged at one end of the first cavity 20, which is close to the second cavity 30, an exhaust outlet for exhausting indoor return air is arranged on the exhaust chamber 27, and the exhaust chamber 27 is arranged between the return air chamber 26 and the fresh air chamber 28; a second air valve 281 is arranged between the exhaust chamber 27 and the fresh air chamber 28, the second air valve 281 can switch between a return air mode, a mixed air mode and a fresh air mode, when the second air valve 281 is closed, the dehumidifier can enter the fresh air mode, and when the second air valve 281 is opened, the dehumidifier can enter the return air mode or the mixed air mode.
In this example, an air outlet cavity 11 is further provided on the air outlet.
Under various operation modes, the air duct of the dehumidifier has the following trend:
when the first air valve 12 is closed, return air and fresh air are mixed and then enter the sensible heat exchanger 22 for precooling, then are dehumidified by the evaporator 21, the dehumidified cold air returns to the other side of the sensible heat exchanger 22 and is subjected to heat exchange preheating with mixed air, and the preheated mixed air enters the condenser 31 and the surface air cooler 32 for further heating and then is sent indoors;
when the bypass air valve is half closed, the return air and the fresh air are mixed and then enter the sensible heat exchanger 22 for precooling, and then are dehumidified by the evaporator 21. Part of the dehumidified cold air returns to the other side of the sensible heat exchanger 22, is subjected to heat exchange preheating with mixed air, and enters the condenser 31 and the surface air cooler 32 for further heating and then is sent to the indoor; one part of the air passes through the first air valve 12 and then directly passes through the condensing fins and the surface air cooler 32 for further heating, and then is sent to the room;
when the bypass air valve is opened, return air and fresh air are mixed and then enter the sensible heat exchanger 22 for precooling, then are dehumidified by the evaporator 21, and the dehumidified cold air passes through the first air valve 12 and then is directly further heated by the condenser 31 and the surface air cooler 32 and then is sent to the indoor.
Corresponding to the above scheme, the embodiment further provides a dehumidifier air valve control method, including the dehumidifier air duct system, where solid arrows in fig. 1 and fig. 2 are airflow directions, where the dehumidifier includes an air chamber 11 formed therein, and an air inlet for sucking air and an air outlet for discharging air are respectively formed on the dehumidifier and communicated with the air chamber 11, and specifically, the air inlet includes a return air inlet for sucking indoor return air, an air outlet for discharging indoor return air and a fresh air inlet for sucking outdoor fresh air, and a user can regulate the opening and closing of the three according to different requirements, or can perform real-time control according to indoor environment, and if indoor environment air quality is good, can open only the return air inlet to enter a full return air inlet mode, and if indoor environment air is general, can enter a mixed air mode by opening the return air inlet, a part of the air outlet and a part of the fresh air inlet, if indoor ambient air is poor, need take a breath, then can only open the new trend and get into the new trend mode and take a breath indoor.
An evaporator 21 and a condenser 31 are arranged between the air inlet and the air outlet, specifically, the evaporator 21 is arranged at one side of the air cavity 11 close to the air inlet, the condenser 31 is arranged at one side of the air cavity 11 close to the air outlet, a first air valve 12 is arranged between the evaporator 21 and the condenser 31, the first air valve 12 is arranged between the evaporator 21 and the condenser 31 and divides the air cavity 11 into a first cavity 20 and a second cavity 30, and the first air valve 12 is installed in the dehumidifier through an air valve actuator so as to be selectively opened and closed and selectively adjusted between different opening degrees.
The method comprises the following steps:
s10, detecting the inlet air temperature of the air inlet and the low-pressure of the heat pump system connected with the evaporator 21 and the condenser 31 in real time to obtain a corresponding temperature value T and a corresponding pressure value P, wherein the temperature value is preferably the return air temperature of the return air inlet, and the pressure value is preferably the return air pressure of the compressor in the heat pump system;
s20, adjusting the first air valve 12 in real time based on the detected temperature value or pressure value, so as to switch the dehumidifier between different operation modes, where the opening degree of the first air valve 12 is inversely proportional to the temperature value or pressure value, that is, the opening degree of the first air valve 12 is smaller when the return air temperature value is higher or the return air port pressure value of the compressor is higher, so as to decrease the airflow passing through the first air valve 12, and the opening degree of the first air valve 12 is larger when the return air temperature value is lower or the return air port pressure value of the compressor is lower, so as to increase the airflow passing through the first air valve 12.
The control method can be completed by adopting the programmable single chip microcomputer controller, the temperature sensor, the pressure sensor and the air valve actuator in a matching way, can ensure that the unit is not easy to frost while high-efficiency dehumidification is realized, ensures the continuous operation and the operation safety of the unit, avoids the condition that the unit needs to be stopped for defrosting when a heat pump system of the unit frosts, and further improves the dehumidification efficiency of the dehumidifier.
In this embodiment, in order to ensure the smoothness of the air flow in the air chamber 11 inside the dehumidifier, a ventilation bypass 111 communicating the first chamber 20 and the second chamber 30 may be provided in the dehumidifier, when the opening degree of the first air valve 12 is large, the air flow may directly flow from the first chamber 20 to the second chamber 30 through the first air valve 12, when the opening degree of the first air valve 12 is small and in a half-open state, a part of the air flow passes through the first air valve 12, and another part of the air flow is blocked by the first air valve 12 and bypasses the first chamber 20 having the evaporator 21 side, after performing more sufficient heat exchange and dehumidification with the evaporator 21, the air flow may flow from the ventilation bypass 111 to the second chamber 30 having the condenser 31 side, when the first air valve 12 is in a closed state, the air flow may bypass the first chamber 20 to perform more sufficient heat exchange with the evaporator 21, and the air flow after forming dry and cold air by heat exchange may perform heat exchange with the return air again, the dry cold air is preheated, the return air can be precooled, and then the return air flows to the second cavity 30 from the ventilation bypass 111, so that the continuous operation of the dehumidifier can be ensured, the dry air is output, the problem of frosting inside the dehumidifier can be avoided, and the operation temperature range can be increased.
Specifically, the operation modes of the dehumidifier include:
a bypass mode: when the detected temperature value is higher than a preset first upper limit value Tn, or when the detected pressure value is higher than a preset second upper limit value Pn, the opening degree of the first air valve 12 is 0%. When the temperature value and the pressure value are higher than the first upper limit value Tn and the second upper limit value Pn, the temperature and the humidity of the air flow entering the dehumidifier from the air inlet are proved to be higher, at the moment, in order to improve the dehumidification efficiency of the dehumidifier, the opening degree of the first air valve 12 is set to be 0 percent, namely, the air flow cannot directly pass through the first air valve 12, corresponding to the state, when the first air valve 12 is closed, the air flow has longer circuitous residence time in the first cavity 20, so that the heat exchange is carried out more fully with the evaporator 21, the return air entering the first cavity 20 can be utilized to carry out heat exchange with the cooled and dehumidified cold air, meanwhile, the pressure can be improved, the machine set is prevented from stopping for defrosting, in order to avoid that the humidity of the cold air is increased in the heat exchange process of the dehumidified cold air and the return air, the return air and the dehumidified cold air can be separated through separated pipelines, and the moisture in the air can be condensed to a greater extent, the dehumidification energy efficiency is greatly increased.
Mixed mode: when the temperature value is lower than or equal to the first upper limit Tn and higher than the preset first lower limit T1, or when the pressure value is lower than or equal to the preset second upper limit Pn and higher than the preset second lower limit P1, the opening degree of the first air valve 12 is 10% to 90%. In this state, the humidity and temperature of the airflow entering the first cavity 20 are approximately in the middle of the range of the temperature range that can be processed by the dehumidifier, so the first air valve 12 is in a half-open state, a part of the airflow can directly pass through the first air valve 12 and enter the second cavity 30 after passing through the evaporator 21 in the first cavity 20, the other part of the airflow completes roundabout further dehumidification and cooling in the first cavity 20, the heat exchange process is completed, the airflow is led to the second cavity 30 from the ventilation bypass 111, and finally the two airflows are mixed in the second cavity 30 and are adjusted by the condenser 31 to be heated to the temperature meeting the comfort level of the human body, and the airflow is discharged out of the air cavity 11.
A through mode: when the temperature value is lower than or equal to the preset first lower limit value T1, or when the pressure value is lower than or equal to the preset second lower limit value P1, the opening degree of the first air valve 12 is 100%. In this state, it is proved that the temperature and humidity of the air flow flowing into the first cavity 20 are relatively low, the air flow can directly pass through the first air valve 12 to pass from the first cavity 20 to the second cavity 30, and the air flow passes through the evaporator 21 to meet the dehumidification process, so that the condition that the air flow with lower temperature stays in the first cavity 20 for too long to cause the temperature of the air in the first cavity 20 to be lower and lower, and finally frost is formed on the surface of the evaporator 21 can be avoided.
By the control method, the dehumidifier can improve the dehumidification efficiency as much as possible on the premise of ensuring that the evaporator 21 is not easy to frost, the resistance in the air cavity 11 is properly reduced, and the unit is safe and has high energy efficiency.
The first upper limit Tn, the first lower limit T1, the second upper limit Pn, and the second lower limit P1 may be individually set according to the environment and scene of the dehumidifier and the function to be achieved.
In this example, the first upper limit Tn is set to 18 ℃ and the first lower limit T1 is set to 13 ℃ in order to make the scheme easier to understand. At this temperature, the dehumidifier has high dehumidification efficiency and stability.
The second upper limit value Pn and the second lower limit value P1 correspond to different values for the plurality of types of refrigerant:
the second upper limit Pn of the R410A and R32 refrigerant units is 0.8MPa, and the second lower limit P1 is 0.7 MPa;
the second upper limit Pn of the R407C, R22 and R290 refrigerant units is 0.5MPa, and the second lower limit P1 is 0.4 MPa;
the second upper limit Pn of the refrigerant set of R134a and R12 is 0.3MPa, and the second lower limit P1 is 0.2 MPa.
In order to enable the first air valve 12 to more accurately match corresponding values to control the opening degree of the first air valve 12 in a half-open state, the scheme divides the mixed mode into a plurality of states, the mixed mode respectively corresponds to different temperature ranges and the opening degree of the first air valve 12 in different states, the first air valve 12 forms different opening degrees in different temperature ranges, and in this example, the detected temperature values include 5 states:
state 1: t is more than 13 ℃ and less than or equal to 14 ℃, and opening degree is as follows: 80% -90%;
state 2: t is more than 14 ℃ and less than or equal to 15 ℃, and opening degree is as follows: 70% -79%;
state 3: t is more than 15 ℃ and less than or equal to 16 ℃, and opening degree is as follows: 50% -69%;
and 4: t is more than 16 ℃ and less than or equal to 17 ℃, and opening degree is as follows: 30% -49%;
and state 5: t is more than 17 ℃ and less than or equal to 18 ℃, and the opening degree is as follows: 10 to 29 percent.
And in the state of detecting the pressure value, the hybrid mode includes a plurality of states, each of which corresponds to a different pressure range and the opening degree of the first damper 12.
Specifically, the calculation formula of the pressure range and the opening degree of the first air valve 12 in the mixed mode is as follows:
state 1: p is more than P1 and less than or equal to P2, and the opening degree is as follows: k 1;
state 2: p is more than P2 and less than or equal to P3, and the opening degree is as follows: k 2;
……
state (n-1): p (n-1) < P ≦ Pn, opening degree: kn;
wherein P1+ Δ = P2, P2+ Δ = P3 … … P (n-1) + Δ = Pn, Δ = (Pn-P1)/(n-2);
k1＜k2＜……＜kn；
k1 and k2 … … kn are opening values corresponding to the first air valve 12 in the mixed mode, n-1 is the state number of the mixed mode, P1 and P2 … … Pn are pressure values, and delta is the difference value between any two adjacent pressure values.
In response to the above, in this embodiment, the mixing mode is divided into 5 states, the states 1 to 5 correspond to different pressure ranges and different opening degrees of the first air valve 12, and the pressure values corresponding to the second upper limit value Pn and the second lower limit value P1 and the states 1 to 5 in the bypass state can be adjusted and set according to different types of refrigerants:
R410A and R32 refrigerant units:
state 1: 0.7MPa (P1) < P ≦ 0.72MPa (P2), State 2: 0.72MPa (P2) < P ≦ 0.74MPa (P3), State 3: 0.74MPa (P3) < P ≦ 0.76MPa (P4), State 4: 0.76MPa (4) < P ≦ 0.78MPa (P5) state 5: 0.78MPa (P5) < P ≦ 0.80MPa (Pn).
R407C and R22 and R290 refrigerant trains:
state 1: 0.4MPa (P1) < P ≦ 0.42MPa (P2), State 2: 0.42 (P2) < P ≦ 0.44MPa (P3), State 3: 0.44MPa (P3) < P ≦ 0.46MPa (P4), State 4: 0.46 (P4) < P ≦ 0.48MPa (P5), State 5: 0.48MPa (P5) < P ≦ 0.50MPa (Pn).
R134a and R12 refrigerant units:
state 1: 0.2MPa (P1) < P ≦ 0.22MPa (P2), State 2: 0.22MPa (P2) < P ≦ 0.24MPa (P3), State 3: 0.24MPa (P3) < P ≦ 0.26MPa (P4), State 4: 0.26 (P4) < P ≦ 0.28MPa (P5), State 5: 0.28MPa (P5) < P ≦ 0.30MPa (Pn).
Since the refrigerant has different types, and the pressure values of the high-pressure end and the low-pressure end of the refrigerant are different in different types and different operating states, the flow rate of the first air valve 12 can be adjusted relatively accurately by adjusting the opening degree of the first air valve 12 through the pressure value, but since a pressure sensor is not arranged on each heat pump system, a temperature sensor is arranged in the air return chamber 26, and the adjustment through the temperature value of the return air temperature has higher universality compared with the adjustment through the pressure value.
In a more specific scheme, the corresponding opening degrees of the first air valve 12 in the state 1 to the state 5 are:
state 1: 90 percent;
state 2: 70 percent;
state 3: 50 percent;
and 4: 30 percent;
and state 5: 10 percent.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are used in an orientation or positional relationship merely for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, configuration, and operation in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims (10)

1. A dehumidifier duct system comprising:
the dehumidifier is characterized by comprising a dehumidifier body (10), wherein a wind cavity (11) is formed in the dehumidifier body (10), and an air inlet and an air outlet are respectively formed at two opposite ends of the dehumidifier body (10) and are communicated with the wind cavity (11);
in the ventilation direction of the dehumidifier body (10), an evaporator (21) and a condenser (31) are sequentially arranged in the air cavity (11);
the first air valve (12) is arranged between the evaporator (21) and the condenser (31) and divides the air cavity (11) into a first cavity (20) and a second cavity (30), the first air valve (12) is used for adjusting the flow of air flow directly passing from the first cavity (20) to the second cavity (30), and a normally open ventilation bypass (111) is connected between the first cavity (20) and the second cavity (30);
in the open state of the first air valve (12), the air flow can directly flow from the first cavity (20) to the second cavity (30) through the first air valve (12); when the first air valve (12) is in a half-open or closed state, part or all of the air flow bypasses in the first cavity (20), and flows to the second cavity (30) from the ventilation bypass (111) after further heat exchange and dehumidification with the evaporator (21).
2. The dehumidifier duct system according to claim 1, wherein an air return chamber (26), an air exhaust chamber (27) and a fresh air chamber (28) are formed in the air chamber (11) at a side close to the air inlet, the air inlet is disposed in the air return chamber (26), and the fresh air chamber (28) is communicated with the air chamber (11).
3. The dehumidifier duct system of claim 2, wherein a second air valve (281) selectively communicating the exhaust chamber (27) and the fresh air chamber (28) is disposed therebetween.
4. A dehumidifier air valve control method comprising a dehumidifier duct system according to any one of claims 1 to 3, comprising the steps of:
s10, detecting the inlet air temperature of the air inlet in real time, and the low-pressure of a heat pump system connected with the evaporator (21) and the condenser (31) to obtain a corresponding temperature value T and a corresponding pressure value P;
s20, adjusting the first air valve (12) in real time based on the detected temperature value or pressure value to enable the dehumidifier to switch between different working modes, wherein the opening degree of the first air valve (12) is inversely proportional to the temperature value or the pressure value.
5. The dehumidifier air valve control method of claim 4, wherein the operation mode of the dehumidifier includes:
a bypass mode: when the temperature value is detected to be higher than a preset first upper limit value Tn, or when the pressure value is detected to be higher than a preset second upper limit value Pn, the opening degree of the first air valve (12) is 0%;
mixed mode: when the temperature value is lower than or equal to a first upper limit value Tn and higher than a preset first lower limit value T1, or when the pressure value is lower than or equal to a preset second upper limit value Pn and higher than a preset second lower limit value P1, the opening degree of the first air valve (12) is 10% -90%;
a through mode: when the temperature value is lower than or equal to a preset first lower limit value T1 or when the pressure value is lower than or equal to a preset second lower limit value P1, the opening degree of the first air valve (12) is 100%.
6. The dehumidifier valve control method of claim 5, wherein said first upper limit Tn is 18 ℃ and said first lower limit T1 is 13 ℃.
7. The dehumidifier air valve control method according to claim 5, wherein the mixing mode respectively comprises a plurality of states, each state respectively corresponds to a different temperature range and the opening degree of the first air valve (12).
8. The dehumidifier air valve control method according to claim 5, wherein the mixing mode comprises a plurality of states, each state corresponds to a different pressure range and the opening degree of the first air valve (12).
9. The dehumidifier air valve control method according to claim 8, wherein the calculation formula of the mixed mode pressure range and the opening degree of the first air valve (12) is as follows:
state 1: p is more than P1 and less than or equal to P2, and the opening degree is as follows: k 1;
state 2: p is more than P2 and less than or equal to P3, and the opening degree is as follows: k 2;
……
state (n-1): p (n-1) < P ≦ Pn, opening degree: kn;
wherein P1+ Δ = P2, P2+ Δ = P3 … … P (n-1) + Δ = Pn, Δ = (Pn-P1)/(n-2);
k1＜k2＜……＜kn；
k1 and k2 … … kn are opening values corresponding to the first air valve (12) in the mixed mode, n-1 is the state number of the mixed mode, P1 and P2 … … Pn are pressure values, and delta is the difference value between any two adjacent pressure values.
10. The dehumidifier air valve control method of claim 9, wherein a difference between the second upper limit value Pn and the second lower limit value P1 is 0.1MPa, n = 6.
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