Method for controlling forward and reverse rotation of motor of clothes dryer and clothes dryer

Abstract

The invention discloses a clothes dryer motor reverse and forward rotation control method and a clothes dryer, and relates to the technical field of clothes dryers, the clothes dryer motor reverse and forward rotation control method comprises a main winding, an auxiliary winding, a controller, a first relay, a second relay and a centrifugal switch, the main winding and a power source are connected in series, and the first relay, the auxiliary winding, the first relay, the centrifugal switch and the power source are electrically connected. And the controller is used for controlling the on-off of the first relay and the second relay so as to realize the exchange between the head end and the tail end of the secondary winding. Only the auxiliary winding column is always used as the starting winding, strict requirements for consistency of parameters of the main winding and the auxiliary winding in the prior art are not needed, the specification of the main winding can be flexibly matched, the quality control difficulty in the production process is reduced, and the production efficiency and the yield of the motor are improved.

Description

Technical Field

[0001] This invention relates to the field of dryer technology, specifically to a dryer motor reversal control method and a dryer. Background Technology

[0002] During the operation of a clothes dryer, the forward and reverse rotation control of the motor is a key technical aspect for achieving even drying of clothes and preventing them from tangling and clumping. The control scheme directly determines the motor's structural complexity, manufacturing cost, and long-term operational reliability. Currently, the mainstream motor forward and reverse rotation control methods in the industry are mainly divided into two categories, but both suffer from the drawback of difficulty in simultaneously achieving both economy and stability, as detailed below:

[0003] The dual-winding independent switching scheme, as disclosed in patent application number 201410652397.2, is based on configuring two independent windings for the motor (corresponding to the forward winding and the reverse winding respectively). By switching the main control switch, the forward winding or the reverse winding is selectively turned on, thereby realizing the motor direction adjustment.

[0004] The main and auxiliary winding swapping scheme achieves direction switching by reversing the wiring relationship between the motor's main and auxiliary windings. During forward rotation, the main winding is used as the main winding, and the auxiliary winding as the auxiliary winding; during reverse rotation, the auxiliary winding becomes the main winding, and the main winding becomes the auxiliary winding.

[0005] In both of the above control methods, it is clearly required that the key parameters of the main winding and the auxiliary winding, such as wire diameter, number of turns, and impedance, must be completely consistent. However, the requirement for consistent parameters of the main and auxiliary windings significantly increases the precision standard of winding manufacturing, increases the difficulty of quality control in the production process, and directly drives up the process cost. Summary of the Invention

[0006] The purpose of this invention is to provide a method for controlling the reverse rotation of a dryer motor and a dryer, so as to solve the shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a method for controlling the reverse rotation of a dryer motor and a dryer, comprising a main winding, a secondary winding, a controller, a first relay, a second relay, and a centrifugal switch, wherein the main winding and a power supply are connected in series, and the first relay, the secondary winding, the centrifugal switch, and the power supply are electrically connected, and the controller is used to control the on / off state of the first relay and the second relay to realize the swapping of the beginning and end of the secondary winding.

[0008] Preferably, the first relay includes a first contact, a second contact, a third contact, a fourth contact, and a fifth contact, wherein the first contact is connected to the first terminal of the power supply, and the fifth contact is connected to the first terminal of the secondary winding.

[0009] Preferably, the second relay comprises a sixth contact, a seventh contact, an eighth contact, a ninth contact and a tenth contact, the seventh contact is connected to the second end of the auxiliary winding, the ninth contact and the centrifugal switch are connected in series and then connected to the second end of the power supply, the second contact is connected to the sixth contact, and the fourth contact is connected to the tenth contact.

[0010] Preferably, when the motor rotates in the first direction, the first contact, the third contact and the fifth contact are connected, and the seventh contact, the eighth contact and the ninth contact are connected; when the motor rotates in the second direction, the first contact, the second contact, the sixth contact and the seventh contact are connected, and the fifth contact, the fourth contact, the tenth contact and the ninth contact are connected.

[0011] A clothes dryer comprises a circuit control method, and further comprises a condenser, an upper portion of the condenser being provided with a spraying system for cleaning the condenser.

[0012] Preferably, the condenser comprises straight pipe sections and U-shaped bent pipes arranged in parallel and alternatingly connected to form a serpentine flow channel, the straight pipe sections are provided with fin assemblies along the axial directions thereof, and windward gaps are arranged between adjacent fin assemblies.

[0013] Preferably, the spraying system comprises a shell covering the outside of the condenser and a spraying pipe, the upper portion of the shell is attached to the top of the fin assembly, the upper portion of the shell is provided with a ventilation opening matched with the windward gap, the upper portion of the shell is rotationally connected with a lead screw, the lead screw is connected with the spraying pipe through a transmission member, the transmission member comprises a sliding seat, the sliding seat is rotationally connected with a threaded sleeve, the lead screw is threadedly connected with the threaded sleeve, a torsional spring is arranged outside the threaded sleeve, one end of the torsional spring is connected to the threaded sleeve, and the other end of the torsional spring is connected to the sliding seat, the spraying pipe is slidingly connected to one end of the sliding seat, the spraying pipe is provided with a rack, and a gear wheel is fixedly installed at the end of the threaded sleeve, the rack is engaged with the gear wheel.

[0014] Preferably, the spraying system further comprises a stop assembly, the stop assembly comprises a transmission shaft, stop blocks and a first motor, the transmission shaft is rotationally connected to the shell, four stop blocks are arranged along the axial direction of the transmission shaft, and the included angles between adjacent stop blocks are 90 degrees.

[0015] Preferably, the spraying system comprises temperature sensors, and the temperature sensors are used for detecting the temperatures of the corresponding fin assemblies.

[0016] In the above technical solution, the motor reverse rotation control method of the clothes dryer and the clothes dryer provided by the application have the advantages that the auxiliary winding column always serves as a starting winding, the strict requirement that the parameters of the main winding and the auxiliary winding are consistent in the prior art is not required, the specifications of the main winding can be flexibly matched, the quality control difficulty in the production process is reduced, and the production efficiency and the yield of the motor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This invention provides a method for controlling the reverse rotation of a dryer motor and a circuit diagram of the dryer.

[0019] Figure 2 This invention provides a method for controlling the reverse rotation of a dryer motor and a schematic diagram of the dryer's condenser.

[0020] Figure 3 This invention relates to a method for controlling the reverse rotation of a dryer motor and a cross-sectional view of the condenser of a dryer.

[0021] Figure 4 This is a schematic diagram of a dryer motor reversal control method and a dryer spray system according to the present invention.

[0022] Figure 5 This is a schematic diagram of a dryer motor reversal control method and a dryer spray pipe and its components according to the present invention.

[0023] Figure 6 This invention relates to a method for controlling the reverse rotation of a dryer motor and an accessory for the dryer. Figure 5 Enlarged view of point A in the middle;

[0024] Figure 7 This is a schematic diagram of a dryer motor reversal control method and a dryer spray pipe embedded in the housing according to the present invention.

[0025] Figure 8 This invention relates to a method for controlling the reverse rotation of a dryer motor and an accessory for the dryer. Figure 7 Enlarged view of point B in the middle;

[0026] Figure 9 This is a schematic diagram of a dryer motor reversal control method and a dryer stop assembly according to the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Condenser; 11. Straight pipe section; 12. Fin assembly; 13. Air gap; 2. Spray system; 21. Housing; 22. Vent; 23. Lead screw; 231. Second motor; 24. Spray pipe; 27. Transmission component; 271. Sliding seat; 272. Threaded sleeve; 273. Torsion spring; 274. Gear; 275. Rack; 3. Temperature sensor; 4. Stop assembly; 41. Drive shaft; 42. Stop block; 43. First motor; 5. Main winding; 51. Auxiliary winding; 6. Controller; 7. First relay; 71. First contact; 72. Second contact; 73. Third contact; 74. Fourth contact; 75. Fifth contact; 8. Second relay; 81. Sixth contact; 82. Seventh contact; 83. Eighth contact; 84. Ninth contact; 85. Tenth contact; 9. Centrifugal switch. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Please see Figures 1-9 The present invention provides a method for controlling the reverse rotation of a dryer motor and a dryer, comprising a main winding 5, an auxiliary winding 51, a controller 6, a first relay 7, a second relay 8, and a centrifugal switch 9. The main winding 5 is connected in series with a power source, and the first relay 7, the auxiliary winding 51, the centrifugal switch 9, and the power source are electrically connected. The controller 6 is used to control the on / off state of the first relay 7 and the second relay 8 to realize the swapping of the beginning and end of the auxiliary winding 51.

[0030] The first relay 7 includes a first contact 71, a second contact 72, a third contact 73, a fourth contact 74, and a fifth contact 75. The first contact 71 is connected to the first terminal of the power supply, and the fifth contact 75 is connected to the first terminal of the auxiliary winding 51.

[0031] The second relay 8 includes a sixth contact 81, a seventh contact 82, an eighth contact 83, a ninth contact 84, and a tenth contact 85. The seventh contact 82 is connected to the second end of the auxiliary winding 51. The ninth contact 84 is connected in series with the centrifugal switch 9 and then connected to the second end of the power supply. The second contact 72 is connected to the sixth contact 81, and the fourth contact 74 is connected to the tenth contact 85.

[0032] When the motor rotates in the first direction, the first contact 71, the third contact 73, and the fifth contact 75 are connected, and the seventh contact 82, the eighth contact 83, and the ninth contact 84 are connected. When the motor rotates in the second direction, the first contact 71, the second contact 72, the sixth contact 81, and the seventh contact 82 are connected, and the fifth contact 75, the fourth contact 74, the tenth contact 85, and the ninth contact 84 are connected.

[0033] Please refer to the embodiments of the present invention. Figure 1 When the motor rotates in the first direction, the controller 6 controls the relay contacts to be in the following on / off states: First relay 7: first contact 71, third contact 73, and fifth contact 75 are connected; Second relay 8: seventh contact 82, eighth contact 83, and ninth contact 84 are connected to form a circuit. At this time, the current path is: first power supply terminal - first contact 71 of first relay 7 - third contact 73 - fifth contact 75 - first terminal of auxiliary winding 51 - second terminal of auxiliary winding 51 - seventh contact 82 of second relay 8 - eighth contact 83 - ninth contact 84 - centrifugal switch 9 - second power supply terminal.

[0034] At this time, the current direction of the secondary winding 51 is from the first end to the second end, which matches the current direction of the main winding 5, driving the motor to rotate in the forward direction.

[0035] When the motor rotates in the second direction, the controller 6 controls the relay contacts to switch to the following on / off states: First relay 7: First contact 71 and second contact 72 are closed; Fifth contact 75 and fourth contact 74 are closed;

[0036] Second relay 8: Sixth contact 81 and seventh contact 82 are connected; tenth contact 85 and ninth contact 84 are connected (because the ninth contact 84 is still connected in series with centrifugal switch 9).

[0037] Its current path is as follows: power supply first terminal - first contact 71 of first relay 7 - second contact 72 - sixth contact 81 of second relay 8 - seventh contact 82 - second terminal of auxiliary winding 51 - first terminal of auxiliary winding 51 - fifth contact 75 of first relay 7 - fourth contact 74 - tenth contact 85 of second relay 8 - ninth contact 84 - centrifugal switch 9 - power supply second terminal;

[0038] At this time, the current direction of the secondary winding 51 is from the second end to the first end, which is opposite to that during forward rotation. It matches the current direction of the main winding 5 and uses the phase difference to achieve reverse rotation.

[0039] The core of the control method is to switch the on / off state of the contacts of the first relay 7 and the second relay 8 through the controller 6 to reverse the current direction of the secondary winding 51. Since the rotation direction of the motor is determined by the phase difference of the currents in the main and secondary windings 51, the change of the current direction of the secondary winding 51 will cause the phase difference to reverse, thereby realizing the forward and reverse switching of the motor. The function of the centrifugal switch 9 is to disconnect after the motor starts, reduce the working time of the secondary winding 51, and reduce energy consumption and heat generation risk. The wire diameter of the main winding 5 is larger than that of the secondary winding 51 because the main winding 5 bears the main driving load and requires a larger current carrying capacity.

[0040] In this design, the auxiliary winding 51 can reverse the current direction (the beginning and end are swapped) by switching the contacts of the first relay 7 and the second relay 8 through the controller 6, thus enabling the motor to rotate in both directions. The auxiliary winding 51 does not need to be consistent with the main winding 5, and the auxiliary winding 51 only serves as the starting winding. It automatically disconnects when it rotates to a specific speed. Therefore, the number of turns, wire diameter, and other parameters of the auxiliary winding 51 can be freely adjusted, making the manufacturing cost and process difficulty of the auxiliary winding much lower than that of the main winding.

[0041] Heat pump dryers use heat flow to dry clothes inside the drum. The heat flow circulation path is: drum - filter box - condenser - evaporator - fan. During this heat flow circulation, a large amount of lint is intercepted by the filter box, which has an interception efficiency of over 99%. However, over long-term use, some lint will still be carried by the heat flow to the condenser. The condenser primarily cools the water molecules in the heat flow, causing them to adhere to the condenser for drying. Once lint comes into contact with the condenser, it is highly likely to adhere. Currently, the market... The existing dryer features two types of devices. One type has a detachable structure located directly in front of the condenser, on its windward side, which is manually cleaned after opening. The other type has a spray head in front of the condenser, connected to the condenser's storage box or an external water source via a water pump. This spray washes the windward side of the condenser, greatly protecting its heat exchange efficiency. However, over time, lint still accumulates inside the condenser, even though the windward side remains clean. This lint severely hinders heat exchange. Therefore, a new dryer is proposed to address these issues.

[0042] A clothes dryer includes a circuit control method and a condenser 1. A spray system 2 is provided on the upper part of the condenser 1 for cleaning the condenser 1.

[0043] The condenser 1 consists of parallel straight pipe sections 11 and U-shaped bends that alternately connect to form a serpentine flow channel. The straight pipe sections 11 are provided with fin assemblies 12 along their axial direction, and there is an air-facing gap 13 between adjacent fin assemblies 12.

[0044] By setting multiple fin assemblies 12 and forming windward gaps 13, each fin assembly 12 has an independent windward surface. The windward surface is most likely to trap lint. Compared with the single windward surface in the prior art, the present invention has multiple windward surfaces, which greatly reduces the adhesion of lint inside the fin assembly 12. By moving the spray system 2, the windward surface of each fin assembly 12 can be cleaned. The water sprayed by the spray system 2 can wash away the lint, so that the lint can be removed from the windward surface, which has a very good cleaning effect.

[0045] In another embodiment of the present invention, please refer toFigures 2-5 The spray system 2 includes a housing 21 covering the outside of the condenser 1 and a spray pipe 24. The upper part of the housing 21 is attached to the top of the fin assembly 12. The upper part of the housing 21 has a vent 22 that matches the windward gap 13. A lead screw 23 is rotatably connected to the upper part of the housing 21. The lead screw 23 is connected to the spray pipe 24 through a transmission component 27. The transmission component 27 includes a sliding seat 271. A threaded sleeve 272 is rotatably connected to the sliding seat 271. The lead screw 23 and the threaded sleeve 272 are threadedly connected. A torsion spring 273 is provided on the outside of the threaded sleeve 272. One end of the torsion spring 273 is connected to the threaded sleeve 272, and the other end is connected to the sliding seat 271. The spray pipe 24 is slidably connected to one end of the sliding seat 271. A rack 275 is provided on the spray pipe 24. A gear 274 is fixedly installed at the end of the threaded sleeve 272. The rack 275 and the gear 274 mesh.

[0046] During cleaning, the second motor 231 drives the lead screw 23 to rotate, while the threaded sleeve 272 is restricted by the torsion spring 273. The threaded sleeve 272 is relatively stationary relative to the sliding seat 271. As the lead screw 23 rotates and the threaded sleeve 272 is threadedly connected to it, the threaded sleeve 272 will inevitably have a tendency to displace along its axial direction. This will cause the sliding seat 271 to move. The movement of the sliding seat 271 will inevitably drive the spray pipe 24 to move. In this way, the spray pipe 24 can move above the windward gap 13. The ventilation port 22 set at this location ensures that the water sprayed from the spray pipe 24 can pass smoothly. The water sprayed by the spray pipe 24 cleans the windward side of the fin assembly 12.

[0047] Since each air gap 13 is provided with a corresponding vent 22, when the fin assembly 12 corresponding to the air gap 13 is blocked, if it happens to be in the drying process, its ventilation will be insufficient, and the airflow will flow through the vent 22 to the next air gap 13, sacrificing part of the cooling effect of the fin assembly 12, so as to achieve a stable circulation of the overall airflow.

[0048] In another embodiment of the present invention, a stop assembly 4 is also included. The stop assembly 4 includes a drive shaft 41, a stop block 42, and a first motor 43. The drive shaft 41 is rotatably connected to the housing 21. Four stop blocks 42 are arranged along the axial direction of the drive shaft 41, and the included angle between adjacent stop blocks 42 is set to 90 degrees.

[0049] Although the fin assembly 12 of this invention, with its multiple windward surfaces, is able to trap most of the lint, some lint still adheres to the fin interlayer of the fin assembly 12. This lint is difficult to wash away. Therefore, in this embodiment, spraying and airflow can be combined. During spraying, the dryer's fan is simultaneously activated, allowing airflow to pass through the fin assembly 12. The airflow, along with water, cleans the fin assembly 12. Under the action of the airflow, the water flows directly into the interlayer of the fin assembly 12. Thus, the combined action of water and airflow cleans the adhering material at the fin assembly 12's clamping point, significantly improving the cleaning effect. However, during this process, the airflow will inevitably flow towards the vent 22, causing water from the spray pipe 24 to flow back into the housing 21. Therefore, by setting the stop assembly 4, the first motor 43 drives the transmission shaft 41 to rotate, which will raise the stop block 42 at the corresponding vent 22. The lead screw 23 continues to rotate. At this time, the sliding seat 271 is restricted from moving forward, while the lead screw 23 continues to rotate. When the torque of the lead screw 23 is greater than that of the torsion spring 273, the threaded sleeve 272 will rotate. The rotation of the threaded sleeve 272 will drive the gear 274 to rotate, and the rack 275 will be displaced downward under the meshing force. The rack 275 is fixed on the spray pipe 24, and the spray pipe 24 will inevitably move downward in sync. The downward movement of the spray pipe 24 can embed into the vent 22 and block the vent 22. In this way, the airflow can be forced to pass through the gap of the fin assembly 12 so that the airflow and water flow can be perfectly matched to obtain a better cleaning effect.

[0050] In another embodiment of the present invention, a temperature sensor 3 is included, and a plurality of temperature sensors 3 are used to detect the temperature of the corresponding fin assembly 12.

[0051] During operation, if a fin assembly 12 becomes blocked, the fin assembly 12 lacks airflow and the temperature drops. Therefore, the temperature sensor 3 detects a lower temperature. After drying, the controller will control the first motor 43 to rotate, thereby raising the corresponding stop block 42 of the fin assembly 12. The second motor 231 will drive the lead screw 23 to rotate, thereby driving the spray pipe 24 to move to the corresponding vent 22 to clean the fin assembly 12. By initiating local cleaning through the fin assembly 12, the spray pipe 24 only moves to the corresponding vent 22, without needing to cover the entire area. This reduces the amount of water sprayed per cleaning cycle.

[0052] The core of temperature sensor 3 is to locate blockages, but long-term monitoring of temperature data can lead to equipment health warning functions. If the temperature of a certain fin assembly 12 remains low and there is no improvement even after cleaning, the controller can determine that the fin may have faults such as fin detachment or pipe leakage, rather than simple blockage, and will prompt the user through the dryer panel that the condenser 1 needs to be inspected, reducing the user's later maintenance costs.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the reverse rotation of a dryer motor and a dryer, characterized in that, The system includes a main winding (5), a secondary winding (51), a controller (6), a first relay (7), a second relay (8), and a centrifugal switch (9). The main winding (5) is connected in series with the power supply. The first relay (7), the secondary winding (51), the first relay (7), the centrifugal switch (9), and the power supply are electrically connected. The controller (6) is used to control the on / off state of the first relay (7) and the second relay (8) to achieve the swapping of the beginning and end of the secondary winding (51).

2. The method for controlling the reverse rotation of a clothes dryer motor and the clothes dryer according to claim 1, characterized in that, The first relay (7) includes a first contact (71), a second contact (72), a third contact (73), a fourth contact (74), and a fifth contact (75). The first contact (71) is connected to the first end of the power supply, and the fifth contact (75) is connected to the first end of the secondary winding (51).

3. The method for controlling the reverse rotation of a clothes dryer motor and the clothes dryer according to claim 2, characterized in that, The second relay (8) includes a sixth contact (81), a seventh contact (82), an eighth contact (83), a ninth contact (84), and a tenth contact (85). The seventh contact (82) is connected to the second end of the secondary winding (51). The ninth contact (84) and the centrifugal switch (9) are connected in series to the second end of the power supply. The second contact (72) is connected to the sixth contact (81), and the fourth contact (74) is connected to the tenth contact (85).

4. The method for controlling the reverse rotation of a dryer motor and the dryer according to claim 3, characterized in that, When the motor rotates in the first direction, the first contact (71), the third contact (73), and the fifth contact (75) are connected, and the seventh contact (82), the eighth contact (83), and the ninth contact (84) are connected. When the motor rotates in the second direction, the first contact (71), the second contact (72), the sixth contact (81), and the seventh contact (82) are connected, and the fifth contact (75), the fourth contact (74), the tenth contact (85), and the ninth contact (84) are connected.

5. A clothes dryer, characterized in that, The circuit control method according to any one of claims 1-4 further includes a condenser (1), wherein a spray system (2) is provided on the upper part of the condenser (1) for cleaning the condenser (1).

6. A clothes dryer according to claim 5, characterized in that, The condenser (1) includes parallel straight pipe sections (11) and U-shaped bends that alternately connect to form a serpentine flow channel. The straight pipe sections (11) are provided with fin assemblies (12) along their axial direction, and windward gaps (13) are provided between adjacent fin assemblies (12).

7. A clothes dryer according to claim 6, characterized in that, The spray system (2) includes a housing (21) covering the outside of the condenser (1) and a spray pipe (24). The upper part of the housing (21) is attached to the top of the fin assembly (12). The upper part of the housing (21) has a vent (22) adapted to the windward gap (13). A lead screw (23) is rotatably connected to the upper part of the housing (21). The lead screw (23) is connected to the spray pipe (24) through a transmission component (27). The transmission component (27) includes a sliding seat (271). The sliding seat (271) is rotatably connected to a screw. The threaded sleeve (272) is threadedly connected to the lead screw (23). A torsion spring (273) is provided on the outside of the threaded sleeve (272). One end of the torsion spring (273) is connected to the threaded sleeve (272), and the other end is connected to the sliding seat (271). The spray pipe (24) is slidably connected to one end of the sliding seat (271). A rack (275) is provided on the spray pipe (24). A gear (274) is fixedly installed at the end of the threaded sleeve (272). The rack (275) and the gear (274) mesh.

8. A clothes dryer according to claim 7, characterized in that, It also includes a stop assembly (4), which includes a drive shaft (41), a stop block (42), and a first motor (43). The drive shaft (41) is rotatably connected to the housing (21). The four stops (42) are arranged along the axial direction of the drive shaft (41), and the included angle between adjacent stops (42) is set to 90 degrees.

9. A clothes dryer according to claim 6, characterized in that, Includes temperature sensors (3), a plurality of said temperature sensors (3) for detecting the temperature of the corresponding fin assembly (12).

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