Mini type heat pump clothes dryer

Abstract

The utility model provides a mini type heat pump type clothes dryer. The mini type heat pump type clothes dryer comprises a barrel and a box which are arranged inside and outside. The cylinder body is composed of a cylinder body A and a cylinder body B which are arranged front and back and communicated, the cylinder body A is of a cylindrical structure with two open ends, the cylinder body B is of a cylindrical structure with a sealed rear end, the cylinder body A and the cylinder body B share the central axis, the diameter of the cylinder body A is larger than that of the cylinder body B, the front end of the cylinder body B is connected with the rear end of the cylinder body A, and a plurality of air ports are formed in the rear end of the cylinder body B; a refrigerating system and a driving motor are further arranged in the box body, and the driving motor synchronously drives a fan of the refrigerating system and the barrel B to rotate. A brand-new structural design, an innovative air duct design and a novel refrigerating system design are adopted, miniaturization of the heat pump technology is achieved, and the heat pump technology is applied to the field of mini clothes dryers.

Description

Technical Field

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

[0002] Most of the 2-3kg mini and desktop dryers on the market for small families and single white-collar workers use a direct-discharge drying solution, that is, directly using PTC to heat the air, continuously heating the room temperature gas, and thus heating the clothes. The advantages are low price and light weight, and the disadvantages are high power consumption, usually >1000W. Because there is no dehumidification function, the drying time is long and the effect is worse, usually requiring 2 hours. In addition, in order to ensure the drying effect, the air temperature needs to be heated to above 70°C, which will cause certain damage to chemical fiber clothes.

[0003] Heat pump heating + condensation technology is very suitable for drying clothes. Its advantage is that the heat pump system's energy efficiency coefficient COP>2.3 through the compressor's work, which saves energy significantly. The condenser air is heated to 40-50°C, which increases the temperature of the clothes and turns the air into humid hot gas. When its evaporator surface temperature is 10-20°C, it "precipitates" condensed water when it is cold and becomes dry air. After being heated by the condenser, it returns to the clothes. During the process, the humid hot air is not discharged outside the box, and the condensed water is collected in the water collection box. Therefore, the drying effect is significantly improved and the user experience is good. Compared with direct-exhaust dryers, the power is reduced by 50%-70% and the time is shortened by 50%! Therefore, most of the large household dryers on the market have shifted from direct-exhaust to heat pump types.

[0004] However, the biggest disadvantage of heat pump technology is that the system is complex and it is difficult to make it small, because refrigeration devices such as compressor + condenser + evaporator must be used, resulting in a space of 150-200mm for the height or depth of the heat pump dryer. Therefore, heat pump dryers are only suitable for household dryers with a weight of 7-10kg, width>550, depth>550, and height>700. At present, the drum and air supply fan of heat pump dryers on the market share a motor, so only one-way rotation drying is supported, which easily causes clothes to be "entangled". This is a pain point of heat pump dryers. In order to solve the entanglement problem, some designs introduce "intelligent two-way": the drum can rotate in both directions, but only one direction of rotation has the ability to supply air to the drum, so the drying efficiency of "intelligent two-way" is greatly reduced! It is not very practical.

[0005] If the miniaturization problem of the heat pump system can be solved, and the problem of two-way drying can be solved, the direct-discharge mini dryer can be upgraded to a heat pump dryer, with energy consumption <400w and drying time <30min (single unit), thus achieving product upgrading. It can be predicted that this will greatly overcome the consumer pain points of existing mini dryers, improve product quality, and increase market acceptance. Summary of the invention

[0006] To solve the above problems, the present invention discloses a mini heat pump dryer, which adopts a brand-new structural design, innovative air duct design and novel refrigeration system design, realizes the miniaturization of heat pump technology, and applies heat pump technology to the field of mini dryers.

[0007] The specific plan is as follows:

[0008] A mini heat pump clothes dryer, characterized in that: it comprises a barrel and a box body arranged inside and outside; the barrel body consists of a barrel A and a barrel B which are installed front and back and connected to each other, the barrel A is a cylindrical structure with openings at both ends, the barrel B is a cylindrical structure with a sealed rear end, and the barrel A and the barrel B share a central axis, wherein the diameter of the barrel A is greater than that of the barrel B, the front end of the barrel B is connected to the rear end of the barrel A, and a plurality of air outlets are arranged at the rear end; a refrigeration system and a drive motor are also arranged in the box body, and the drive motor synchronously drives the fan of the refrigeration system and the barrel B to rotate.

[0009] As a further improvement of the present invention, the refrigeration system includes an evaporator, a condenser, a fan and a compressor. The evaporator is placed below the cylinder A, the condenser is placed below the cylinder B, the fan is placed behind the condenser, and an air duct connected to the air outlet is provided above the condenser. The drive motor is respectively connected to the cylinder B and the fan through two transmission belts, ensuring that hot air can be supplied to the cylinder when the fan is rotated forward and reversely. A return air outlet is provided at the lower front side of the cylinder A, and the return air outlet is connected to the front side of the evaporator through the return air duct.

[0010] As a further improvement of the present invention, a volute is installed outside the fan, the upper end of the volute is open, and the lower end is arc-shaped. The air duct is used to connect the air outlet on the rear side of the cylinder B with the upper open end of the volute, and a guide block is provided in the air duct. The guide block has limit stops on both sides for limiting the forward and reverse movement of the guide block.

[0011] As a further improvement of the present invention, the guide block is an isosceles trapezoidal block structure with a concave bottom, the middle of which is installed in cooperation with the rotating shaft of the fan through a support frame, the upper end of the support frame is fixedly connected to the guide block, and the lower end is freely rotatably installed on the rotating shaft of the fan, and the bottom surface of the guide block is a concave arc surface, the arc surface is coaxial with the fan, and a soft strip that can be bent under wind pressure is provided in the middle of the arc surface. When the fan rotates clockwise, the wind pressure acts on the soft strip, causing the guide block to deviate clockwise until it contacts the limit stop, at which time the left air duct is opened and the right air duct is closed; when the fan rotates counterclockwise, the wind pressure acts on the soft strip, causing the guide block to deviate counterclockwise until it contacts the limit stop, at which time the right air duct is opened and the left air duct is closed. In both states, an efficient centrifugal air duct can be formed between the guide block and the bottom of the volute, greatly improving the air supply effect, and the soft strip bends under wind pressure, thereby reducing wind resistance.

[0012] As a further improvement of the present invention, the guide block is an L-shaped structure composed of two guide plates, and the middle inflection part thereof is rotatably placed on the line connecting the center of the cylinder B and the center of the fan. When the fan rotates clockwise, the guide block rotates clockwise, the left air duct is opened, and the right air duct is closed; when the fan rotates counterclockwise, the guide block rotates counterclockwise, the right air duct is opened, and the left air duct is closed. This ensures that the fan can deliver air to the upper air duct in both forward and reverse rotations.

[0013] As a further improvement of the present invention, the evaporator is tilted and a water receiving box is provided at the bottom. The evaporator is a copper tube fin evaporator, the tilt angle α is in the range of 10-30°, and the height is 0.5H1, so as to leave a height space of 0.5H1 for the lower water receiving box. In order to ensure the evaporation amount, the length L of the evaporator can be increased, and the length L satisfies L*sinα<0.5H1, where H1 is the distance between the bottom of the cylinder A and the bottom of the box.

[0014] As a further improvement of the present invention, the condenser adopts a vertically placed microchannel parallel flow condenser and is placed directly below the cylinder B, close to the back of the box. In this way, the smaller radius of the cylinder in section B can be used to increase the height dimension of the condenser = H1 + ΔR, thereby increasing the heating capacity of the condenser.

[0015] As a further improvement of the present invention, the cylinder A and the cylinder B are connected by sleeve connection. In addition, the cylinder A and the cylinder B can also be connected by screws, rivets, buckles, etc.

[0016] As a further improvement of the present invention, the cylinder A is made of stainless steel, with a diameter of R1 and a depth of L1; the front end diameter of the cylinder B = R1, the rear end diameter R2 = R1-ΔR, and the depth L2, and is injection molded by high temperature resistant, high strength polymer material; wherein the range of ΔR is 20-50mm.

[0017] As a further improvement of the present invention, the compressor is a high back pressure rotor compressor of R290, with a height of <184mm, a maximum diameter of <120mm, an input power of <300w, a cooling capacity of >700W under heat pump working conditions, and a COP of >2.3. In order to reduce the height space of the refrigeration pipeline connected to the compressor, the exhaust pipe and the suction pipe of the compressor are placed on its side.

[0018] As a further improvement of the present invention, the present invention adopts a microcomputer controller to monitor the air temperature T in the cylinder, the evaporator temperature, and the condenser temperature. 运行 The compressor stops working until T <T 运行 -ΔT; when the evaporator surface temperature is T1 <T min The compressor stops until T1>T min +ΔT1, the evaporator "defrosts" operation is carried out, and the cylinder and the air duct continue to work. When the compressor exhaust temperature exceeds the protection temperature T C When the compressor stops, the cylinder and the air duct stop working, achieving "overheat protection".

[0019] In addition, the present invention also realizes 30-120min timing through a microcomputer controller. The drying speed 1-2-3 gears are set by setting T 运行 The size of the compressor affects the start-up rate of the compressor, thereby affecting the drying speed. An electric control box is provided on one side of the top of the inner cavity of the box.

[0020] The beneficial effects of the present invention are:

[0021] 1. The dryer cylinder is cleverly divided into two sections, A and B, ensuring the diameter of cylinder A and the cylinder depth L1+L2, making the cylinder volume large enough and reserving a 185X120 space for the compressor;

[0022] 2. Creatively designed forward and reverse bidirectional centrifugal fan + air duct, so that when the drum and fan share a driving motor, not only can the drum and fan rotate forward and reverse synchronously, but also can smoothly supply air to the upward air duct, thus realizing bidirectional drum drying and solving the problem of clothes entanglement;

[0023] 3. The condenser is cleverly placed at the rear, and the small radius of the cylinder B is used to bring additional ΔR height, so that the size of the condenser is enlarged, ensuring the heating capacity of the heat pump and improving the drying efficiency; at the same time, the evaporator is placed at an angle, and the length of the evaporator is used to ensure the evaporation amount, avoiding the height size limit of the evaporator; the heat exchange efficiency of the inclined evaporator is higher, and the wind resistance is smaller, which ensures the dehumidification capacity of the heat pump and further improves the drying efficiency;

[0024] 4. The present invention controls the size of the 35L volume cylinder to 450X450x530, which is close to the size of the mini direct-discharge dryer on the market; in addition, the input power of the whole machine is less than 400w, which saves more than 50% energy compared with the direct-discharge type; because the drying time is reduced by 50%, further energy saving can be achieved, and the total energy saving is more than 70%;

[0025] 5. The hot air in the present invention circulates internally without discharging hot and humid air to the outside, which not only provides a good experience, but also greatly shortens the drying time, from 30 minutes (single piece) to 1.5 hours (multiple pieces); the drying temperature is 40-50 degrees, which does not damage the clothes;

[0026] 6. The present invention adopts R290 refrigerant, which can meet the environmental protection requirements of countries around the world, can be exported to America and European countries, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 These are three forms of the cylinder in the present invention.

[0028] Figure 2 This is a front view of the cylinder and compressor layout.

[0029] Figure 3 It is a side view of the arrangement of the cylinder and compressor.

[0030] Figure 4 It is a side view of the refrigeration system, where the arrows indicate the direction of gas flow.

[0031] Figure 5 A top view of the refrigeration system.

[0032] Figure 6 : is the internal structure diagram of the air duct in Example 1, wherein the arrow indicates the direction of gas flow, a is the state diagram after the guide block rotates clockwise, and b is the state diagram after the guide block rotates counterclockwise.

[0033] Figure 7 : is the internal structure diagram of the air duct in Example 2, wherein the arrow is the gas flow direction, a is the state diagram after the guide block rotates clockwise, and b is the state diagram after the guide block rotates counterclockwise.

[0034] Figure 8 It is a schematic diagram of the front structure of the present invention.

[0035] Fig. 9 It is a side structural schematic diagram of the present invention.

[0036] Fig.10 It is a schematic diagram of the top structure of the present invention.

[0037] List of reference numerals:

[0038] 1- cylinder A, 2- cylinder B, 3- air outlet, 4- evaporator, 5- condenser, 6- fan, 7- compressor, 8- driving motor, 9- guide block, 10- limit stop, 11- electric control box, 12- water collection box, 13- soft stop bar, 14- return air outlet, 15- return air duct. DETAILED DESCRIPTION

[0039] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Example 1

[0040] like Figure 8-10 As shown, the present invention provides a mini heat pump clothes dryer, comprising a cylinder and a box body arranged inside and outside; the cylinder body is composed of a cylinder A (1) and a cylinder B (2) which are installed front and back and connected to each other, the cylinder A is a cylindrical structure with two ends open, the cylinder B is a cylindrical structure with a sealed rear end, and the cylinder A and the cylinder B share a central axis, wherein the diameter of the cylinder A is larger than that of the cylinder B, the front end of the cylinder B is connected to the rear end of the cylinder A, and a plurality of air outlets (3) are arranged at the rear end; the box body is also provided with a refrigeration system and a drive motor (8), and the drive motor synchronously drives the fan of the refrigeration system and the cylinder B to rotate.

[0041] In this embodiment, the refrigeration system comprises an evaporator (4), a condenser (5), a fan (6) and a compressor (7). The evaporator is placed below the cylinder A, the condenser is placed below the cylinder B, the fan is placed behind the condenser, and an air duct connected to the air outlet is provided above the condenser. The drive motor is connected to the cylinder B and the fan through two transmission belts, respectively, to ensure that hot air can be delivered to the cylinder when the fan rotates forward and reversely. A return air outlet (14) is provided at the lower front side of the cylinder A, and the return air outlet is connected to the front side of the evaporator through the return air duct (15).

[0042] In this embodiment, a volute is installed outside the fan, the upper end of the volute is open, and the lower end is arc-shaped. The air duct is used to connect the air outlet on the rear side of the cylinder B with the upper end opening of the volute. The two sides of the guide block are respectively provided with limit stops (10) for limiting the forward and reverse rotation of the guide block.

[0043] In this embodiment, the guide block (9) is an isosceles trapezoidal block structure with a concave bottom, the middle of which is mounted in cooperation with the rotating shaft of the fan through a support frame, the upper end of the support frame is fixedly connected to the guide block, and the lower end is freely rotatably mounted on the rotating shaft of the fan, the bottom surface of the guide block is a concave arc surface, the arc surface is coaxial with the fan, and a soft stop bar (13) that can bend under wind pressure is provided in the middle of the arc surface. When the fan rotates clockwise ( Figure 6In figure a), the wind pressure acts on the soft stop bar, causing the guide block to deviate clockwise until it contacts the limit stop. At this time, the left air duct is opened and the right air duct is closed. When the fan rotates counterclockwise ( Figure 6 In b), the wind pressure acts on the soft strip, causing the guide block to deflect counterclockwise until it contacts the limit stop. At this time, the right air duct opens and the left air duct closes. In both states, an efficient centrifugal air duct can be formed between the guide block and the bottom of the volute, which improves the air supply effect. The soft strip bends under wind pressure, thereby reducing wind resistance.

[0044] In this embodiment, the evaporator is tilted and a water receiving box (12) is provided at the bottom. The evaporator is a copper tube fin evaporator, the tilt angle α is in the range of 10-30°, and the height is 0.5H1, so as to leave a height space of 0.5H1 for the water receiving box at the bottom. In order to ensure the evaporation capacity, the length L of the evaporator can be increased, and the length L satisfies L*sinα<0.5H1, where H1 is the distance between the bottom of the cylinder A and the bottom of the box. (See Figure 2 and 4 )

[0045] In this embodiment, the condenser is a vertically placed microchannel parallel flow condenser, and is placed directly below the cylinder B (see Figure 4 and 5 ), close to the back of the box. In this way, the smaller radius of the B section cylinder can be used to increase the height dimension H1+ΔR of the condenser and increase the heating capacity of the condenser.

[0046] In this embodiment, the cylinder A and the cylinder B are connected by sleeve connection. In addition, the cylinder A and the cylinder B can also be connected by screws, rivets, buckles, etc.

[0047] As a further improvement of the present invention, the cylinder A is made of stainless steel, with a diameter of R1 and a depth of L1; the front end diameter of the cylinder B = R1, connected to the rear end of the cylinder A, the rear end diameter of the cylinder B is R2 = R1-ΔR, the depth is L2, and is injection molded by a high temperature resistant, high strength polymer material (see Figure 1 a, b, c); wherein the range of ΔR is 20-50mm.

[0048] Assuming that the height from the cylinder to the bottom of the box is H1, and to the side plate of the box is W1, then,

[0049] The volume of the cylinder V = πR1 2 *L1+πR2 2 *L2;

[0050] Compressor height space H2 = H1 + ΔR + R2 * (1-sin45°);

[0051] Press machine diameter space D=W1+ΔR+R2*(1-cos45°).

[0052] For example, for a clothes dryer, R1=190, L1=260, R2=150, L2=80, H1=100, and W1=35, the total volume V≈35L, the allowable height of the compressor H2=184, and the allowable diameter D=119, which can meet the requirements of a 700W special compressor. (See Figure 2 and 3 )

[0053] In this embodiment, the compressor is a high back pressure rotor compressor of R290, with a height of <184mm, a maximum diameter of <120mm, an input power of <300w, a cooling capacity of >700W under heat pump working conditions, and a COP of >2.3. In order to reduce the height space of the refrigeration pipeline connected to the compressor, the exhaust pipe and the suction pipe of the compressor are placed on its side.

[0054] In this embodiment, the present invention uses a microcomputer controller to monitor the air temperature T in the cylinder, the evaporator temperature, and the condenser temperature. 运行 The compressor stops working until T <T 运行 -ΔT; when the evaporator surface temperature is T1 <T min The compressor stops until T1>T min +ΔT1, the evaporator "defrosts" operation is carried out, and the cylinder and the air duct continue to work. When the compressor exhaust temperature exceeds the protection temperature T C When the compressor stops, the cylinder and the air duct stop working, realizing "overheat protection".

[0055] In addition, the present invention also realizes 30-120min timing through a microcomputer controller. The drying speed 1-2-3 gears are set by setting T 运行 The size of the compressor affects the start-up rate of the compressor, thereby affecting the drying speed. An electric control box (11) is provided on one side of the top of the inner cavity of the box.

[0056] The working principle and steps of the present invention are as follows:

[0057] (1) Connect the dryer to the 220V power supply, press the switch to turn on the dryer, the main control panel is turned on, and the display panel shows the current setting mode and the set drying time;

[0058] (2) Press the start button on the main control panel, and the main control panel will give the cylinder drive motor a start command, the cylinder starts to rotate, and the fan starts at the same time;

[0059] (3) The main control board gives a command to start the compressor, the refrigeration system starts to run, the condenser fins are heated to 50-70°C, and the evaporator fins are cooled to 10-20°C;

[0060] (4) Under the action of the fan, the gas is cooled to a low temperature of 20°C by the evaporator, and the water vapor is discharged in the form of condensed water to become low-temperature dry gas;

[0061] (5) Under the action of the fan, the gas flows through the condenser and is heated to become 50°C high-temperature dry gas, which flows upward from the air duct and enters the cylinder through several air inlets at the bottom of the cylinder B;

[0062] (6) The clothes to be dried are heated by the high-temperature dry gas, and the humidity of the clothes gradually decreases; at the same time, the gas in the barrel becomes warm and humid gas;

[0063] (7) The warm and humid gas enters the return air duct through the negative pressure at the return air inlet below the front section of the cylinder and flows to the low-temperature evaporator;

[0064] (8) The warm and humid gas flows through the low-temperature evaporator and becomes dry low-temperature gas, and condensed water is produced. The condensed water flows along the fins of the condenser into the water receiving tray below. The hot air continues to flow into the condenser and is heated to become high-temperature gas.

[0065] (9) When the main control board issues a reverse rotation command, the cylinder drive motor rotates in the reverse direction, and the fan also rotates in the reverse direction. The guide block inside the air duct "turns" under the action of wind pressure, so that the hot air is not affected and continues to flow upward into the bottom air inlet of cylinder B.

[0066] (10) The dryer continues to run until the set running time t 停机 , the compressor stops, the drive motor stops, the display panel prompts that the drying is completed, and the buzzer prompts that the drying is completed. Example 2

[0067] In this embodiment, a guide block (9) is provided in the air duct. The guide block is an L-shaped structure composed of two guide plates, and the middle inflection point is rotatably placed on the line connecting the center of the cylinder B and the center of the fan. When the fan rotates clockwise, the guide block rotates clockwise ( Figure 7 In a), the left duct is open and the right duct is closed; when the fan rotates counterclockwise ( Figure 7 b), the guide block rotates counterclockwise to form Figure 7 In the state of b, the right air duct is open and the left air duct is closed. This ensures that the fan can supply air to the upper air duct in both forward and reverse rotations. The remaining features of this embodiment are the same as those of embodiment 1.

[0068] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A mini heat pump clothes dryer, characterized in that: It includes a cylinder and a box body arranged inside and outside; the cylinder body is composed of a cylinder A and a cylinder B which are installed and connected in a front and rear manner, the cylinder A is a cylindrical structure with openings at both ends, the cylinder B is a cylindrical structure with a sealed rear end, and the cylinder A and the cylinder B share a central axis, wherein the diameter of the cylinder A is larger than that of the cylinder B, the front end of the cylinder B is connected to the rear end of the cylinder A, and a plurality of air outlets are arranged at the rear end; a refrigeration system and a drive motor are also provided in the box body, and the drive motor synchronously drives the fan of the refrigeration system and the cylinder B to rotate.

2. A mini heat pump clothes dryer according to claim 1, characterized in that: The refrigeration system includes an evaporator, a condenser, a fan and a compressor. The evaporator is placed below the cylinder A, the condenser is placed below the cylinder B, the fan is placed behind the condenser, and an air duct connected to the air outlet is provided above the condenser. The drive motor is respectively connected to the cylinder B and the fan through two transmission belts.

3. A mini heat pump clothes dryer according to claim 2, characterized in that: A volute is installed outside the fan, and the upper end of the volute is open. The air duct is used to connect the air outlet on the rear side of the cylinder B with the upper end opening of the volute, and a guide block is provided in the air duct. Limit stops are respectively provided on both sides of the guide block for limiting the forward and reverse movement of the guide block.

4. The mini heat pump clothes dryer according to claim 3, characterized in that: The guide block is an isosceles trapezoidal block structure with a concave bottom, and its middle part is installed in cooperation with the rotating shaft of the fan through a support frame. The upper end of the support frame is fixedly connected to the guide block, and the lower end is freely rotatably installed on the rotating shaft of the fan. The bottom surface of the guide block is a concave arc surface, which is coaxial with the fan, and a soft baffle bar that can bend under wind pressure is provided in the middle of the arc surface.

5. The mini heat pump clothes dryer according to claim 3, characterized in that: The guide block is an L-shaped structure composed of two guide plates, and the inflection point in the middle is rotatably placed on the line connecting the center of the cylinder B and the center of the fan.

6. The mini heat pump clothes dryer according to claim 2, characterized in that: The evaporator is arranged obliquely, and a water receiving box is arranged at the bottom.

7. The mini heat pump clothes dryer according to claim 2, characterized in that: The condenser is a vertically placed microchannel parallel flow condenser, and is placed directly below the cylinder B.

8. The mini heat pump clothes dryer according to claim 2, characterized in that: The exhaust pipe and the intake pipe of the compressor are placed on its side.

9. The mini heat pump clothes dryer according to claim 2, characterized in that: A return air port is provided at the lower front side of the cylinder A, and the return air port is connected to the front side of the evaporator through a return air duct.

10. The mini heat pump clothes dryer according to claim 1, characterized in that: An electric control box is arranged on one side of the inner cavity top of the box body.

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