Heat pump clothes dryer control method and clothes dryer

Abstract

The invention discloses a heat pump clothes dryer control method and a clothes dryer, the clothes dryer comprises a heat pump unit, the heat pump unit comprises an auxiliary cooling element, a condensate water path and a tap water path, and the auxiliary cooling element is arranged between an outlet of a condenser and an inlet of an evaporator and is used for reducing the temperature of a refrigerant; one end of the condensed water path collects condensed water generated by the evaporator, and the other end is communicated with a water inlet of the auxiliary cooling element; the tap water path is communicated with a water inlet of the auxiliary cooling element; the control method comprises the steps that when the auxiliary cooling element works, the dehumidification condition of the evaporator is obtained, and connection and disconnection of the condensate water way and the tap water way are controlled according to the dehumidification condition of the evaporator so as to adjust the working state of the auxiliary cooling element. Cooling water heat exchange is provided for the auxiliary cooling element through condensate water flow and a tap water path, connection and disconnection of the two water paths are controlled according to the dehumidification condition of the evaporator, the temperature of a refrigerant entering the evaporator from the auxiliary cooling element can be reduced, the clothes drying efficiency is improved, water resources can be saved, waste is avoided, and the clothes drying cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of clothes dryers, and in particular, relates to a heat pump clothes dryer control method and a clothes dryer. Background Art

[0002] As people's living standards improve, clothes dryers are becoming more and more popular among consumers, bringing great convenience to people's lives and enabling people to get dry clothes even on rainy days, especially during the plum rain weather in the south.

[0003] Heat pump clothes drying usually includes a driving mechanism, a clothes drying drum, a circulating air duct, a fan and a heat pump unit, etc. The heat pump unit includes an evaporator, a compressor, a condenser and a throttle valve connected in sequence to form a circulation channel for the refrigerant.

[0004] During the drying process, the evaporator absorbs the heat in the circulating air duct, causing the high-humidity air in the air duct to condense and dehumidify, causing the refrigerant to evaporate into a low-temperature, low-pressure gas, which is compressed by the compressor to become a high-temperature, high-pressure gas, and releases heat in the condenser to heat the dehumidified air in the circulating air duct. After obtaining high-temperature dry air, the clothes are dried, and the refrigerant in the condenser becomes a high-pressure, low-temperature liquid, which passes through the throttle valve and becomes a low-pressure, low-temperature liquid; then it enters the evaporator to absorb heat and evaporate, and the cycle continues. Since the heat pump dryer does not require a heater for heating, it realizes internal heat transfer through the heat pump unit, and there is almost no heat loss to the outside, which has the advantages of higher energy utilization and more energy saving.

[0005] Affected by the structure or operating status of the heat pump unit, when the heat pump unit has poor heat dissipation effect, it will cause poor heating effect of the air in the circulating air duct, resulting in poor drying effect, slow drying speed and high energy consumption. In severe cases, the refrigerant temperature is too high, causing the compressor to shut down or be damaged.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art. The purpose is to provide a control method for a heat pump dryer. By setting two water circuits to supply water to the auxiliary cooling element for heat exchange, and controlling the on-and-off of the two water circuits according to the dehumidification condition of the evaporator, the temperature of the refrigerant entering the evaporator from the auxiliary cooling element can be reduced, thereby improving the drying efficiency, saving water resources, avoiding waste and reducing the cost of drying clothes.

[0008] Another object of the present invention is to provide a clothes dryer.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: to provide a heat pump dryer control method, the dryer includes a heat pump unit, the heat pump unit includes an auxiliary cooling element, a condensing water path and a tap water path, the auxiliary cooling element is arranged between the outlet of the condenser and the inlet of the evaporator, and is used to reduce the temperature of the refrigerant; one end of the condensing water path collects the condensed water generated by the evaporator, and the other end is connected to the water inlet of the auxiliary cooling element; the tap water path is connected to the water inlet of the auxiliary cooling element;

[0010] The control method comprises:

[0011] When the auxiliary cooling element is working, the dehumidification condition of the evaporator is obtained, and the opening and closing of the condensing water circuit and the tap water circuit are controlled according to the dehumidification condition of the evaporator to adjust the working state of the auxiliary cooling element.

[0012] Furthermore, if the dehumidification of the evaporator exceeds a preset condition, the condensation water path is controlled to be connected and the tap water path is closed; if the dehumidification of the evaporator does not reach the preset condition, the condensation water path and the tap water path are controlled to be connected.

[0013] Further, the following steps are included:

[0014] S1. Obtain the dehumidification condition of the evaporator by obtaining the condensed water output H of the evaporator of the heat pump unit;

[0015] S2. Determine whether the condensate water output H is less than or equal to the preset value H1. If so, connect the condensate water circuit and the tap water circuit for water replenishment; if not, connect the condensate water circuit.

[0016] Furthermore, the heat pump unit also includes a cooling water tank, the condensing water circuit is normally open and connected to the inlet of the cooling water tank, and the tap water circuit can be switched on and off and connected to the inlet of the cooling water tank; the water inlet of the auxiliary cooling element is connected to the outlet of the cooling water tank, and the auxiliary cooling element is provided with a water outlet;

[0017] In step S1, the condensed water output H of the evaporator of the heat pump unit is obtained by obtaining the water storage capacity in the cooling water storage tank.

[0018] Furthermore, the control method further includes:

[0019] Obtain the heat dissipation status of the heat pump unit, and determine whether to control the auxiliary cooling element to work according to the heat dissipation status.

[0020] Furthermore, the heat pump unit also includes an inlet valve for controlling water inlet to the auxiliary cooling element;

[0021] When the auxiliary cooling element is working, the heat dissipation of the heat pump unit and the corresponding preset opening are obtained, and the inlet valve is controlled to open with the corresponding preset opening. The better the heat dissipation of the heat pump unit, the smaller the opening of the inlet valve; the worse the heat dissipation of the heat pump unit, the larger the opening of the inlet valve.

[0022] Furthermore, before step S1, the following steps are also included:

[0023] S01, obtaining the air inlet temperature or air outlet temperature T of the clothes drying drum,

[0024] S02, determining whether the temperature T is greater than or equal to a preset value T1, if so, controlling the auxiliary cooling element to operate;

[0025] S03, obtaining a preset opening corresponding to the temperature T;

[0026] S04. Open the inlet valve of the auxiliary cooling element at a preset opening.

[0027] Further, after step S2, the following steps are performed:

[0028] After step S2, the following steps are performed:

[0029] S3, obtaining the water storage volume L in the cooling water storage tank;

[0030] S4, judging whether the water storage volume L is less than or equal to a preset value H1, if so, controlling the condensation water path and the tap water path to be connected; if not, judging whether the water storage volume L is greater than a preset value H2, if so, keeping the condensation water path connected and disconnecting the tap water path, wherein H2>H1;

[0031] Preferably, between step S2 and step S3, the following steps are also included:

[0032] S21, obtaining whether the preset condition for the auxiliary cooling element to stop working is met, if so, closing the inlet valve and disconnecting the tap water path and the condensing water path; if not, executing step S22;

[0033] S22, obtaining a preset opening corresponding to the inlet valve according to the heat dissipation condition;

[0034] S23, controlling the inlet valve to operate at a preset opening;

[0035] Step S21 is executed after step S4.

[0036] The present invention also provides a clothes dryer, which adopts any one of the above-mentioned heat pump clothes dryer control methods.

[0037] Further, including, a clothes drying drum;

[0038] The heat pump unit comprises an evaporator, a compressor, a condenser, an auxiliary cooling element, and a throttle valve which are sequentially connected to form a refrigerant cycle, wherein the evaporator, the condenser, and the clothes drying drum are sequentially connected to form a circulating air duct;

[0039] A cooling water storage tank, the water outlet pipeline of the cooling water storage tank is connected to the water inlet of the auxiliary cooling element, and the water outlet pipeline is provided with an openable and closable inlet valve for cooling the refrigerant in the auxiliary cooling element when connected;

[0040] A condensation water circuit, one end of which is used to collect condensed water generated by the evaporator, and the other end of which is connected to the inlet of the cooling water storage tank;

[0041] The tap water channel is communicated with the inlet of the cooling water storage tank, and an on-off valve is arranged on the tap water channel.

[0042] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0043] The clothes dryer of the present invention adds an auxiliary cooling element between the outlet of the condenser of the heat pump unit and the inlet of the evaporator, and provides a condensation water path for collecting condensed water of the evaporator and a tap water path to supply water to the auxiliary cooling element respectively, so as to reduce the temperature of the refrigerant in the auxiliary cooling element. By obtaining the dehumidification condition of the evaporator and controlling the opening and closing of the condensation water path and the tap water path according to different heat dissipation conditions, the need for drying clothes can be met, the temperature of the refrigerant entering the evaporator from the auxiliary cooling element can be reduced, the clothes drying efficiency can be improved, water resources can be saved, water resource waste can be avoided, and the cost of drying clothes can be reduced.

[0044] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0046] Figure 1 is a flow chart of a heat pump clothes dryer control method of the present invention;

[0047] Figure 2 is a flow chart of another heat pump dryer control method of the present invention;

[0048] Figure 3 is a detailed flow chart of a heat pump clothes dryer control method of the present invention;

[0049] Figure 4 is a specific flow chart of a heat pump dryer control method of the present invention;

[0050] Figure 5 It is a working schematic diagram of a heat pump unit of the present invention.

[0051] In the figure: 1. Evaporator; 2. Compressor; 3. Condenser; 4. Auxiliary cooling element; 5. Throttle valve; 6. Condensation water circuit; 7. Tap water circuit; 71. On-off valve; 8. Cooling water storage tank; 81. Inlet valve; 82. Water outlet pipeline; 9. Circulating air duct.

[0052] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0054] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] like Figures 1 to 4 As shown, the present invention provides a heat pump dryer control method, which can improve the heat transfer effect of the heat pump unit to the dryer and improve the drying efficiency of the dryer.

[0057] The heat pump clothes dryer includes a heat pump unit. The heat pump unit includes an auxiliary cooling element, a condensing water path and a tap water path. The auxiliary cooling element is arranged between the outlet of the condenser and the inlet of the evaporator, and is used to take in water to reduce the temperature of the refrigerant. One end of the condensing water path collects the condensed water generated by the evaporator, and the other end is connected to the water inlet of the auxiliary cooling element; the tap water path is connected to the water inlet of the auxiliary cooling element.

[0058] Both the condensing water circuit and the tap water circuit can provide low-temperature water to the auxiliary cooling element, exchange heat with the refrigerant in the auxiliary cooling element, reduce the temperature of the refrigerant entering the evaporator, thereby improving the heat absorption effect of the evaporator and the heat release effect of the condenser, thereby improving the drying efficiency.

[0059] The control method includes: when the auxiliary cooling element is working, obtaining the dehumidification condition of the evaporator, and controlling the on-off of the condensation water path and the tap water path according to the dehumidification condition of the evaporator to adjust the working state of the auxiliary cooling element.

[0060] The clothes dryer of the present invention adds an auxiliary cooling element between the outlet of the condenser of the heat pump unit and the inlet of the evaporator, and provides a condensation water path for collecting condensed water produced by the evaporator and a tap water path to supply water to the auxiliary cooling element respectively, so as to reduce the temperature of the refrigerant in the auxiliary cooling element. By obtaining the dehumidification condition of the evaporator and controlling the opening and closing of the condensation water path and the tap water path according to different dehumidification conditions, the need for drying clothes can be met, the temperature of the refrigerant entering the evaporator from the auxiliary cooling element can be reduced, the clothes drying efficiency can be improved, water resources can be saved, water resource waste can be avoided, and the cost of drying clothes can be reduced.

[0061] If the dehumidification of the evaporator exceeds the preset conditions, the condensation water circuit is controlled to be connected and the tap water circuit is closed; if the dehumidification of the evaporator does not reach the preset conditions, the condensation water circuit and the tap water circuit are controlled to be connected.

[0062] After the auxiliary cooling element of the clothes dryer starts working, when the dehumidification of the evaporator exceeds the preset conditions, the evaporator absorbs heat to condense the moisture in the wet and hot circulating air of the clothes dryer, and the dehumidification amount is large, which means that the evaporator produces more condensed water, which can meet the heat exchange and cooling of the auxiliary cooling element. There is no need to open the tap water line, and only the condensation water line needs to be opened. When the dehumidification of the evaporator is lower than the preset conditions, the evaporator absorbs heat to condense the moisture in the wet and hot circulating air of the clothes dryer, and the effect is poor, which means that the evaporator produces less condensed water. For example, at the beginning of drying or in the middle and late stages of drying, it is necessary to open the condensation water line and the tap water line to exchange heat and cool the auxiliary cooling element.

[0063] The present invention utilizes condensed water generated by the evaporator during the clothes drying process as a part of the cold source for heat exchange of the auxiliary cooling element, which can reduce the use of tap water, reduce user usage costs and save water resources.

[0064] Preferably, the throttle valve of the heat pump unit is connected between the outlet of the auxiliary cooling element and the inlet of the evaporator.

[0065] Since the refrigerant output from the condenser after releasing heat still has a certain temperature, the control method of the present invention is used to initially cool it down through condensed water and / or tap water, and the refrigerant then enters the throttle valve to reduce pressure and temperature, so that the temperature of the refrigerant entering the evaporator is further reduced, thereby improving the heat absorption effect of the evaporator from the air, reducing the moisture in the hot and humid circulating air of the dryer, and also improving the heat dissipation effect of the condenser, thereby improving the drying efficiency.

[0066] The dehumidification condition of the evaporator in the present invention can be quantitatively determined by directly detecting or calculating the amount of condensed water produced by the evaporator through other parameters, or by the air humidity at the air inlet and outlet of the evaporator, and / or the temperature difference between the air inlet and outlet of the evaporator.

[0067] The control method further includes: obtaining the heat dissipation condition of the heat pump unit, and determining whether to control the auxiliary cooling element to operate according to the heat dissipation condition.

[0068] When the heat dissipation of the heat pump unit reaches the start-up conditions, the auxiliary cooling element is controlled to work, so as to avoid starting the auxiliary cooling element when it is unnecessary and causing waste of resources.

[0069] The heat pump unit also includes an inlet valve for controlling water inlet of the auxiliary cooling element, and the water outlet of the auxiliary cooling element is normally open. When it is determined that the auxiliary cooling element is to be turned on, the inlet valve is controlled to open to make the auxiliary cooling element work.

[0070] Although the present invention can control the opening and closing of the condensing water circuit and the tap water circuit according to the heat dissipation of the heat pump unit to achieve the purpose of improving the drying efficiency and saving water, during the auxiliary cooling process, if the auxiliary cooling element always discharges water at a fixed water flow rate, it will still lead to partial waste of water resources, and the auxiliary cooling cannot match the heat dissipation of the heat pump unit. The drying efficiency of the heat pump unit needs to be further improved.

[0071] In view of this, the control method of the present invention further includes: when judging whether to control the auxiliary cooling element to start working, obtaining a corresponding preset opening according to the heat dissipation of the heat pump unit, and controlling the inlet valve to open with the corresponding preset opening.

[0072] The dryer has preset openings corresponding to different heat dissipation conditions of the heat pump unit. The pre-stored relationship between the two is: the better the heat dissipation of the heat pump unit, the smaller the opening of the inlet valve; the worse the heat dissipation of the heat pump unit, the larger the opening of the inlet valve.

[0073] Through the heat dissipation of the heat pump unit, if the heat dissipation is better, the condenser will release more heat, and the heat will heat the air in the circulating air duct. The temperature of the refrigerant output from the condenser will be slightly lower. At this time, the cooling demand of the auxiliary cooling element is smaller. The opening of the inlet valve can be set smaller to allow less cooling water to enter the auxiliary cooling element.

[0074] If the heat dissipation is worse, the condenser will release less heat, and the heat will heat the air in the circulating air duct. The temperature of the refrigerant output from the condenser will be slightly higher. At this time, the refrigerant needs to be further cooled by the auxiliary cooling element. The opening of the inlet valve can be set larger so that more cooling water enters the auxiliary cooling element, the cooling effect is more obvious, and the drying efficiency is improved.

[0075] You can adjust the opening size of the inlet valve first, or you can control the on-off of the condensate water circuit and the tap water circuit first. In actual application, you can choose by yourself.

[0076] A preferred embodiment is as follows Figure 3 to Figure 4 As shown, the control method of the heat pump dryer includes the following steps:

[0077] S1. Obtain the dehumidification condition of the evaporator by obtaining the condensed water output H of the evaporator of the heat pump unit;

[0078] S2. Determine whether the condensate water output H is less than or equal to the preset value H1. If so, connect the condensate water circuit and the tap water circuit for water replenishment; if not, connect the condensate water circuit.

[0079] By obtaining the amount of condensed water from the evaporator to obtain the heat dissipation of the heat pump unit, it is convenient to perform quantitative detection and judgment, and the cost is low. When the condensed water output H obtained after the clothes drying starts is less than or equal to the preset value H1, it means that the amount of condensed water generated by the evaporator is small and cannot generate enough cooling water to cool the refrigerant in the auxiliary cooling element, then the condensed water circuit and the tap water circuit are connected for water replenishment.

[0080] If the obtained condensed water output H is greater than the preset value H1, only the condensed water circuit can be connected to cool the refrigerant in the auxiliary cooling element, and there is no need to connect the tap water circuit, which saves water resources and reduces the user's usage cost.

[0081] Preferably, the heat pump unit further comprises a cooling water tank. The water inlet of the auxiliary cooling element is connected to the outlet of the cooling water tank, and the auxiliary cooling element is provided with a water outlet. The condensing water circuit is normally open and directly connected to the inlet of the cooling water tank, and the tap water circuit can be switched on and off and connected to the inlet of the cooling water tank. The inlet valve is arranged between the outlet of the cooling water tank and the water inlet of the auxiliary cooling element.

[0082] In step S1, the condensed water output H of the evaporator of the heat pump unit is obtained by obtaining the water storage capacity in the cooling water storage tank.

[0083] Specifically, the water storage capacity can be directly detected to obtain the condensed water output H, and the liquid level in the cooling water storage tank can be detected and calculated to obtain the condensed water amount. The condensed water circuit and the tap water circuit can also be directly controlled according to the change of the liquid level.

[0084] Preferably, an on-off valve is provided on the tap water circuit, and the connection or disconnection of the tap water circuit is controlled by controlling the opening and closing of the on-off valve.

[0085] Furthermore, before step S1, the method further includes:

[0086] S01, obtaining the air inlet temperature or air outlet temperature T of the clothes drying drum,

[0087] S02, determining whether the temperature T is greater than or equal to a preset value T1, and if so, controlling the auxiliary cooling element to operate.

[0088] By judging that the air inlet temperature or air outlet temperature T of the drying drum is greater than or equal to the preset value T1, it indicates that the drying has progressed to a certain extent, and the auxiliary cooling element can be turned on to reduce the refrigerant temperature entering the evaporator, so as to avoid the auxiliary cooling element working at the beginning of drying, resulting in waste of water resources and increased usage costs.

[0089] After step S02, or after step S2, the following steps are also included:

[0090] S03, obtaining a preset opening corresponding to the inlet air temperature or outlet air temperature T of the clothes drying drum;

[0091] S04. Open the inlet valve of the auxiliary cooling element at a preset opening.

[0092] Alternatively, the amount of condensed water H of the evaporator may be obtained first, and after determining whether the water circuit is on or off, the air inlet temperature or air outlet temperature T of the clothes dryer may be obtained to control the opening of the inlet valve. Alternatively, the amount of condensed water H of the evaporator may be obtained first, and after determining whether the water circuit is on or off, the air inlet temperature or air outlet temperature T of the clothes dryer may be obtained to control the opening of the inlet valve, and then the amount of condensed water H of the evaporator may be obtained to determine whether the water circuit is on or off.

[0093] A preferred solution is to execute step S03 after step S02.

[0094] Further, after step S2, after adjusting the opening of the inlet valve and the connection and disconnection of the two water channels, the following steps are performed:

[0095] S3, obtaining the water storage volume L in the cooling water storage tank;

[0096] S4. Determine whether the water storage capacity L is less than or equal to the preset value H1. If so, it means that the condensed water generated from the evaporator at this time cannot meet the cooling water volume requirement, and it is necessary to control the connectivity of the condensed water circuit and the tap water circuit; if not, determine whether the water storage capacity L is greater than the preset value H2. If so, it means that the condensed water generated from the evaporator at this time can meet the cooling water volume requirement, and there is no need to supplement tap water. In this case, the condensed water circuit is kept connected and the tap water circuit is disconnected, wherein the preset value H2>H1.

[0097] A specific implementation method is that between step S2 and step S3, the following steps are further included:

[0098] S21, obtaining whether the preset condition for the auxiliary cooling element to stop working is met, if so, closing the inlet valve and disconnecting the tap water path and the condensing water path; if not, executing step S22;

[0099] S22, obtaining a preset opening corresponding to the inlet valve according to the heat dissipation condition;

[0100] S23, control the inlet valve to operate at a preset opening.

[0101] Step S21 is performed after step S4.

[0102] Another specific implementation is that between step S2 and step S3, the following steps are further included:

[0103] S21, obtaining whether the preset condition for the auxiliary cooling element to stop working is met, if so, closing the inlet valve and disconnecting the tap water path and the condensing water path; if not, executing steps S3-S4;

[0104] After step S4, the following steps are performed:

[0105] S22, obtaining a preset opening corresponding to the inlet valve according to the heat dissipation condition;

[0106] S23, controlling the inlet valve to operate at a preset opening;

[0107] S24. Execute step S21.

[0108] The first specific embodiment is preferred.

[0109] Furthermore, in step S22, the preset condition for the auxiliary cooling element to stop operating may be that the dryer has completed drying, or the dryer is in the late stage of drying, is close to completing drying, etc. For example, the determination may be made by detecting the humidity in the clothes or the drying drum.

[0110] In step S22, the air inlet temperature or air outlet temperature T of the clothes drying drum and the corresponding preset opening degree are obtained.

[0111] like Figure 5 As shown, the present invention also provides a clothes dryer, which adopts any of the above-mentioned heat pump clothes dryer control methods.

[0112] The clothes dryer is a heat pump clothes dryer, comprising a clothes drying drum, a heat pump unit, a cooling water storage tank 8, a condensing water path 6 and a tap water path 7. The clothes drying drum can be rotatably arranged.

[0113] The heat pump unit comprises an evaporator 1, a compressor 2, a condenser 3, an auxiliary cooling element 4, and a throttle valve 5 which are sequentially connected to form a refrigerant cycle. The evaporator 1, the condenser 3, and the clothes drying drum are sequentially connected to form a circulation air duct 9.

[0114] The outlet pipe 82 of the cooling water storage tank 8 is connected to the water inlet of the auxiliary cooling element 4. The outlet pipe 82 is provided with an openable and closable inlet valve 81 for cooling the refrigerant in the auxiliary cooling element 4 when connected. A liquid level sensor is provided in the cooling water storage tank 8.

[0115] One end of the condensation water path 6 is used to collect condensed water generated by the evaporator 1, and the other end is connected to the inlet of the cooling water storage tank 8. The tap water path 7 is connected to the inlet of the cooling water storage tank 8, and the tap water path 7 is provided with an on-off valve 71.

[0116] The clothes dryer further comprises a drying air duct and a fan, which are arranged outside the clothes drying drum, and both ends are respectively connected with the clothes drying drum to form a circulating air duct 9. The fan drives the air to circulate in the circulating air duct 9.

[0117] The heat absorbing part of the evaporator 1 and the heat releasing part of the condenser 3 are sequentially arranged in the drying air duct. The hot and humid air in the clothes drying drum is discharged into the external drying air duct, first passing through the evaporator 1, which absorbs the heat of the air in the drying air duct, so that the refrigerant inside is vaporized into a gaseous state, which is compressed into a high-temperature and high-pressure gaseous state by the compressor 2; the hot and humid air in the drying air duct is condensed and dehumidified when it encounters cold, and then continues to flow through the condenser 3, which releases heat to heat the dry air in the drying air duct, and the high-temperature air is guided back into the clothes drying drum for drying.

[0118] The refrigerant in the condenser 3 is cooled and liquefied into liquid, which initially cools the auxiliary cooling element 4, and then passes through the throttle valve 5 to reduce the pressure and cool it down for a second time, and then returns to the evaporator 1 to absorb heat and vaporize, so that the refrigerant entering the evaporator 1 has a lower temperature, thereby improving the cooling and dehumidification effects on the hot and humid circulating air and improving the drying efficiency of the dryer.

[0119] Preferably, the auxiliary cooling element 4 is plate-shaped and has a water-containing cavity inside. The water-containing cavity is provided with a water inlet and a water outlet, and the water inlet is connected to the water outlet pipe 82. The pipe containing the refrigerant is laid in an S-shaped reciprocating manner in the water-containing cavity inside the auxiliary cooling element 4, which can increase the heat exchange area and better cool the temperature of the refrigerant.

[0120] Preferably, the clothes dryer further comprises a box body, and a clothes feeding opening is arranged at the front side of the box body. The front end of the clothes drying drum is an open end, a rotatable sealing support is arranged at the periphery of the clothes feeding opening in the box body, and the rear end of the clothes drying drum is rotatably supported on the rear side wall in the box body.

[0121] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A heat pump dryer control method, characterized in that: The clothes dryer includes a heat pump unit, which includes an auxiliary cooling element, a condensing water path and a tap water path. The auxiliary cooling element is arranged between the outlet of the condenser and the inlet of the evaporator, and is used to reduce the temperature of the refrigerant. One end of the condensing water path collects condensed water generated by the evaporator, and the other end is connected to the water inlet of the auxiliary cooling element. The tap water path is connected to the water inlet of the auxiliary cooling element. The control method comprises: When the auxiliary cooling element is working, the dehumidification condition of the evaporator is obtained, and the opening and closing of the condensing water circuit and the tap water circuit are controlled according to the dehumidification condition of the evaporator to adjust the working state of the auxiliary cooling element.

2. A heat pump dryer control method according to claim 1, characterized in that: If the dehumidification of the evaporator exceeds the preset conditions, the condensation water circuit is controlled to be connected and the tap water circuit is closed; if the dehumidification of the evaporator does not reach the preset conditions, the condensation water circuit and the tap water circuit are controlled to be connected.

3. A heat pump dryer control method according to claim 2, characterized in that: The following steps are involved: S1. Obtain the dehumidification condition of the evaporator by obtaining the condensed water output H of the evaporator of the heat pump unit; S2. Determine whether the condensate water output H is less than or equal to the preset value H1. If so, connect the condensate water circuit and the tap water circuit for water replenishment; if not, connect the condensate water circuit.

4. A heat pump dryer control method according to claim 3, characterized in that: The heat pump unit also includes a cooling water tank, the condensing water circuit is normally open and connected to the inlet of the cooling water tank, and the tap water circuit can be switched on and off and connected to the inlet of the cooling water tank; the water inlet of the auxiliary cooling element is connected to the outlet of the cooling water tank, and the auxiliary cooling element is provided with a water outlet; In step S1, the condensed water output H of the evaporator of the heat pump unit is obtained by obtaining the water storage capacity in the cooling water storage tank.

5. A heat pump dryer control method according to any one of claims 3-4, characterized in that: The control method further comprises: Obtain the heat dissipation status of the heat pump unit, and determine whether to control the auxiliary cooling element to work according to the heat dissipation status.

6. A heat pump dryer control method according to claim 5, characterized in that: The heat pump unit also includes an inlet valve for controlling water inlet to the auxiliary cooling element; When the auxiliary cooling element is working, the heat dissipation of the heat pump unit and the corresponding preset opening are obtained, and the inlet valve is controlled to open with the corresponding preset opening. The better the heat dissipation of the heat pump unit, the smaller the opening of the inlet valve; the worse the heat dissipation of the heat pump unit, the larger the opening of the inlet valve.

7. A heat pump dryer control method according to claim 6, characterized in that: Before step S1, the method further includes the following steps: S01, obtaining the air inlet temperature or air outlet temperature T of the clothes drying drum, S02, determining whether the temperature T is greater than or equal to a preset value T1, if so, controlling the auxiliary cooling element to operate; S03, obtaining a preset opening corresponding to the inlet air temperature or outlet air temperature T of the clothes drying drum; S04. Open the inlet valve of the auxiliary cooling element at a preset opening.

8. A heat pump clothes dryer control method according to any one of claims 5 to 7, characterized in that: After step S2, the following steps are performed: S3, obtaining the water storage volume L in the cooling water storage tank; S4, judging whether the water storage volume L is less than or equal to a preset value H1, if so, controlling the condensation water path and the tap water path to be connected; if not, judging whether the water storage volume L is greater than a preset value H2, if so, keeping the condensation water path connected and disconnecting the tap water path, wherein H2>H1; Preferably, between step S2 and step S3, the following steps are also included: S21, obtaining whether the preset condition for the auxiliary cooling element to stop working is met, if so, closing the inlet valve and disconnecting the tap water path and the condensing water path; if not, executing step S22; S22, obtaining a preset opening corresponding to the inlet valve according to the heat dissipation condition; S23, controlling the inlet valve to operate at a preset opening; Step S21 is executed after step S4.

9. A clothes dryer, characterized in that: A heat pump dryer control method according to any one of claims 1 to 8 is adopted.

10. A clothes dryer according to claim 9, characterized in that: include, Drying tube; The heat pump unit comprises an evaporator, a compressor, a condenser, an auxiliary cooling element, and a throttle valve which are sequentially connected to form a refrigerant cycle, wherein the evaporator, the condenser, and the clothes drying drum are sequentially connected to form a circulating air duct; A cooling water storage tank, the water outlet pipeline of the cooling water storage tank is connected to the water inlet of the auxiliary cooling element, and the water outlet pipeline is provided with an openable and closable inlet valve for cooling the refrigerant in the auxiliary cooling element when connected; A condensation water circuit, one end of which is used to collect condensed water generated by the evaporator, and the other end of which is connected to the inlet of the cooling water storage tank; The tap water channel is communicated with the inlet of the cooling water storage tank, and an on-off valve is arranged on the tap water channel.

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