JP2014212823A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of hot water from a filter even in a state where energization is cut off.SOLUTION: A washing machine includes: a circulation path 44 the one end of which is connected to a bottom part 33a of an outer tub 33 and the other end of which is made to face an opening part 34b of a washing/dewatering tub 34; a circulation pump 45 which discharges and circulates washing water in the outer tub 33 into the washing/dewatering tub 34 through the circulation path 44; and filter means 47 which is provided in the circulation path 44 and which removes a foreign substance in the washing water. The filter mans 47 includes: a filter case 47a which communicates with and is connected with the circulation path 44; a filter 47b detachably attached to the filter case 47a; and locking means 48 for keeping the filter 47b in an attached state. The locking means 48 performs locking when the temperature of the washing water is higher than a predetermined temperature.

Description

  The present invention relates to a washing machine for washing laundry such as clothes.

  Conventionally, in this type of washing machine, a filter device that removes foreign matters such as lint contained in the washing water is provided in the drainage path, and the filter can be detachably provided to remove the collected foreign matters. ing. Then, it is considered that drainage is prevented from leaking outside the apparatus during maintenance of the filter device (for example, see Patent Document 1).

  FIG. 8 shows a conventional washing machine described in Patent Document 1. In FIG. In FIG. 8, a drainage path 3 for discharging water in a water tank 2 that rotatably supports the drum 1, and detachably disposed in the middle of the drainage path 3, collects foreign matters such as lint contained in drainage. A filter device 4, a drainage introduction path 5 that is provided in communication with the drainage path 3 and guides a part of the drainage; a residual water detection means 6 that includes a float that detects a water level in the drainage introduction path 5; A lock device 7 that regulates the removal of the filter device 4 in conjunction with the water detection means 6 is provided, and the filter when there is residual water by detecting the remaining water and regulating the removal of the filter device 4. The water leakage due to the removal of the device 4 is prevented.

  The operating body is made of a shape memory alloy whose shape changes with the temperature change of the fluid, and the valve body is brought into contact with and separated from the valve seat by the shape change of the operating body due to the temperature change of the fluid. A valve has been considered (see, for example, Patent Document 2).

JP 2010-136740 A Japanese Utility Model Publication No. 56-113274

  However, in the conventional configuration, since the residual water detecting means is configured by a float provided in the drainage introduction path, there is a problem that the float is contaminated by dust or lint in the drainage, resulting in malfunction. Further, since the lock device that restricts the removal of the filter device is configured to be electrically driven, there is a problem in that it does not operate when the power supply is shut off. In general, the maintenance work of the filter device is often performed after washing is finished, and the washing machine is in a stopped state, and when the control means for driving the lock device is inactive, the filter device There was a problem that it was not possible to prevent water leakage due to removal.

  An object of the present invention is to solve the above-described conventional problems, and to provide a washing machine capable of preventing leakage of warm water from a filter even in a state where the energization of the washing machine is interrupted. To do.

In order to solve the conventional problems, a washing machine of the present invention includes an outer tub supported in a washing machine body, a washing and dewatering tub disposed rotatably in the outer tub, and the outer tub. A water supply means for supplying washing water therein, a heating means for heating the washing water, a circulation path with one end connected to the bottom of the outer tub and the other end facing the opening of the washing and dehydrating tub, A circulation pump that circulates the wash water in the outer tub through the circulation path and into the washing and dewatering tub; and a filter means that is provided in the circulation path and removes foreign matters in the wash water. The filter means includes the circulation A filter case that is connected in communication with the path; a filter that is detachably mounted in the filter case; and a lock unit that holds the filter in a mounted state. When the temperature is higher than the specified temperature Those that are configured to click.

  As a result, when washing water or residual water is present in the outer tub or circulation path and is higher than a predetermined temperature during or after washing, the lock means operates and the filter cannot be removed even when power is cut off. It becomes possible to prevent leakage of hot water and improve safety.

  The washing machine of the present invention can prevent the filter from being removed even when the energization is interrupted when the washing water or the remaining water is present in the outer tub or the circulation path and is higher than a predetermined temperature. Can be prevented and safety can be improved.

Sectional drawing of the principal part of the washing machine in Embodiment 1 of this invention Sectional drawing of the principal part of the washing machine in Embodiment 2 of this invention Sectional drawing of the principal part of the washing machine in Embodiment 3 of this invention Sectional drawing of the principal part of the washing machine in Embodiment 4 of this invention Sectional drawing of the principal part of the filter means of the washing machine in Embodiment 5 of this invention Sectional drawing of the principal part of the filter means of the washing machine Sectional drawing of the principal part of the washing machine in Embodiment 6 of this invention Cross section of the main part of a conventional washing machine

  The washing machine of the present invention includes an outer tub supported within the washing machine body, a washing and dewatering tub rotatably disposed in the outer tub, and water supply means for supplying washing water into the outer tub. A heating means for heating the washing water, a circulation path having one end connected to the bottom of the outer tub and the other end facing the opening of the washing and dewatering tub, and the circulation path for washing water in the outer tub A circulation pump that circulates in the washing and dewatering tank, and a filter means that is provided in the circulation path and removes foreign matter in the washing water, the filter means being connected to the circulation path, and a filter case, A filter that is detachably mounted in the filter case; and a lock unit that holds the filter in a mounted state, and the lock unit is configured to lock when the temperature of the washing water is higher than a predetermined temperature. Is

  As a result, when washing water or residual water is present in the outer tub or circulation path and is higher than a predetermined temperature during or after washing, the lock means operates and the filter cannot be removed even when the power is cut off. It becomes possible to prevent leakage of hot water and improve safety.

  In the above configuration, the lock means includes a lock unit that prevents the filter from being detached, a temperature sensing unit that senses the temperature of the washing water, and a lock that drives the lock unit according to the temperature sensed by the temperature sensing unit. An operation unit, and the temperature sensing unit may be provided in the circulation path.

  As a result, even if there is a small amount of residual water in the circulation path where residual water tends to accumulate, the temperature can be reliably sensed to operate the lock portion, and the reliability of the lock means can be improved.

In the above configuration, the lock means includes a lock unit that prevents the filter from being detached, a temperature sensing unit that senses the temperature of the washing water, and a lock that drives the lock unit according to the temperature sensed by the temperature sensing unit. An operation part, and the temperature sensing part may be provided in the filter case.

  Thereby, the lock | rock part can be operated by sensing the temperature of the residual water which leaks initially, and the reliability of a locking means can be improved.

  In the above configuration, the lock means includes a lock unit that prevents the filter from being detached, a temperature sensing unit that senses the temperature of the washing water, and a lock that drives the lock unit according to the temperature sensed by the temperature sensing unit. An operation unit, and the locking means may be provided in the filter.

  Thereby, the sensitivity of a temperature sensing part can be raised, a lock part can be operated quickly, and the reliability of a locking means can be improved.

  In the above configuration, the lock means includes a lock unit that prevents the filter from being detached, a temperature sensing unit that senses the temperature of the washing water, and a lock that drives the lock unit according to the temperature sensed by the temperature sensing unit. An operation unit, and the temperature sensing unit may be formed of a coiled shape memory alloy.

  Thereby, the lock operation part can be reliably extended above the set temperature, the reliability of the lock means can be improved, and the configuration can be simplified.

  In the above configuration, the lock unit may be configured by a liquid expansion working body having a temperature sensing unit that senses the temperature of the washing water, and the temperature sensing unit may be provided in an outer tub near the heating unit. .

  As a result, the temperature of the remaining water can be sensed from a position away from the filter to activate the lock unit, and the temperature in the outer tub with the highest residual water temperature can be sensed to leak the hot water. Can be prevented, and safety can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a main part of the washing machine according to the first embodiment of the present invention. In FIG. 1, an outer tub 33 is elastically supported by an elastic body 31 and a damping device 32 in a washing machine body 30 so as to be swingable. The washing / dehydrating tub 34 is rotatably disposed in the outer tub 33. The motor (driving means) 35 is composed of a brushless DC motor, and is capable of freely changing the rotation speed by inverter control.

  The motor 35 is attached to the rear surface side of the outer bottom portion of the outer tub 33. The power of the motor 35 is supplied to the washing / dehydrating tub 34 via a motor pulley 35a attached to the rotating shaft of the motor 35 and a drive belt 35b installed on the washing / dehydrating tub pulley 34a attached to the rotating shaft of the washing / dehydrating tub 34. It is transmitted and rotated.

  A water supply valve (water supply means) 36 is connected to a water tap or the like, and supplies washing water to the outer tub 33 and the detergent supply means 37. The water supply valve (water supply means) 36 directly supplies water into the outer tub 33 and the detergent supply means 37. This is an electromagnetic two-way valve that switches to indirect water supply. The water level detection means 38 detects the water level of the washing water in the outer tub 33. The drain valve (drainage means) 39 drains the washing water in the outer tub 33 to the outside of the machine.

  The control means 40 is disposed in the upper part of the washing machine body 30 and is washed based on the setting content input by an operation display unit (not shown) provided on the front upper part of the washing machine body 30. Each process of rinsing and dehydration is sequentially controlled, and the motor 35, the water supply valve 36, the drain valve 39, and the like are sequentially controlled via power switching means (not shown).

  The damping device 32 is a viscous damper that uses oil as a working fluid, and reduces the resonance vibration amplitude of the outer tub 33 at the time of dehydration activation. Between the bottom 30 a of the washing machine body 30 and the bottom 33 a of the outer tub 33. It is fixed. The legs 41 are made of an elastic body such as rubber and are disposed at the four corners of the bottom 30 a of the washing machine body 30.

  As the heating means 42, a sheathed heater that can be used in water is used, and is arranged at the bottom in the outer tub 33 by being bent in a substantially U shape. The washing water in the outer tub 33 is heated to a temperature suitable for washing (for example, 40 ° C.) based on the set temperature set by the operation display unit, and is also suitable for sterilization (for example, 70 ° C.). ). The temperature of the washing water is detected by a temperature detection means 43 such as a thermistor provided at the bottom 33a of the outer tub 33, and the heating means 42 is controlled by inputting an output signal of the temperature detection means 43 to the control means 40. .

  A circulation path 44 is provided with one end connected to the bottom 33a of the outer tub 33 and the other end facing an input port (opening) 34b opened on the front side of the washing and dehydrating tub 34. It is arranged below. The circulation path 44 is provided with a circulation pump 45 that pressurizes and circulates the washing water in the outer tub 33. A jet nozzle 46 is connected to the outlet side 45 a of the circulation pump 45, and washing water is discharged into the washing / dehydrating tank 34 from the jet port 46 a provided in the opening 33 b of the outer tub 33. .

  The circulation path 44 is provided with filter means 47 for removing foreign matters such as lint in the washing water flowing through the circulation path 44, and the filter means 47 is disposed on the inlet side 45 b of the circulation pump 45.

  The filter means 47 includes a filter case 47a that is connected to the circulation path 44, a filter 47b that is detachably mounted in the filter case 47a, a filter knob 47c that holds the filter 47b when the filter 47b is mounted and removed, It is comprised with the locking means 48 which hold | maintains 47b in a mounting state.

  The lock means 48 is provided at a temperature sensing portion 49 that is thermally coupled to the circulation path 44, a lock operation portion 50 that is supported by the temperature sensing portion 49 and made of bimetal, and a tip of the lock operation portion 50. When the temperature sensing unit 49 senses a temperature higher than a predetermined temperature (for example, 70 ° C.), the locking unit 48 is activated.

  The temperature sensing part 49 is joined to the inlet side 45b of the circulation pump 45, and absorbs heat from the washing water staying in the inlet side 45b to support the lock operation part 50 made of bimetal and to transmit heat. To do. The lock portion 51 is configured to be moved by thermal deformation of the lock operation portion 50 and to be inserted into the lock hole 52 provided in the filter knob 47c.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. First, the door 30b that opens and closes the opening 33b provided on the front side of the outer tub 33 is opened, and the laundry is put into the washing and dehydrating tub 34 from the input port 34b that opens on the front side of the washing and dehydrating tub 34, After putting the detergent into the detergent supply means 37, the operation display unit is operated to start operation.

As a result, the control means 40 sets the water supply valve 36 to the detergent supply means 37 side, and the outer tank 33
Start water supply within. At this time, the supplied washing water flows into the gap formed by the outer tub 33 and the washing and dehydrating tub 34, and the laundry does not directly absorb water, so that it is possible to prevent the temperature of the laundry from being lowered due to water absorption. it can.

  When the amount of laundry put in is detected by a cloth amount detection means (not shown), and a predetermined amount of water set in advance according to the amount of laundry is supplied, the control means 40 performs washing and removal. Soaking the water tank 34 at a rotation speed (for example, 45 r / min) at which the water tank 34 can be washed is repeatedly forward and reverse, lifting the laundry in the rotation direction and dropping it from the upper part in the washing and dewatering tank 34, so-called Perform scouring. When performing sterilization washing, the washing water collected in the bottom 33a of the outer tub 33 is heated by the heating means 42 until the temperature detection means 43 detects, for example, 70 ° C.

  Meanwhile, the circulation pump 45 is driven, and the wash water flowing out from the bottom 33a of the outer tub 33 to the circulation path 44 is sucked from the inlet side 45b of the circulation pump 45 through the filter means 47, and then the circulation pump 45 It flows into the jet nozzle 46 provided on the outlet side 45a, and jets into the washing and dewatering tank 34 from the jet port 46a.

  The washing water discharged into the washing / dehydrating tub 34 dissolves dirt from the laundry and accumulates in the bottom 33a of the outer tub 33 again. Foreign matter such as lint that has flowed out of the laundry during washing is collected by the filter means 47 and removed, and the washing water from which the foreign matter has been removed flows into the circulation pump 45. When the collection of foreign matter proceeds and accumulates in a large amount in the filter means 47, the flow of washing water is blocked by the filter means 47, the circulating washing water is reduced, and the washing water ejected from the ejection port 46a of the ejection nozzle 46 is reduced. Then, it is necessary to clean the filter means 47.

  When removing foreign matter such as lint collected by the filter 47b, the filter knob 47c is rotated to take out the filter 47b from the filter case 47a, and after removing the foreign matter, it is mounted in the filter case 47a.

  After the washing is finished, the drain valve 39 is operated and the washing water is drained. When the temperature of the washing water is heated to, for example, 70 ° C. in the high temperature washing, if the high temperature washing water stays in the circulation path 44 without draining completely, the lock operation is performed via the temperature sensing unit 49. The part 50 is heated and thermally deformed, and the lock part 51 moves in the direction of the lock hole 52.

  When the lock 51 is inserted into the lock hole 52, the rotation of the filter knob 47c is hindered, and the filter 47b cannot be removed from the filter case 47a. When time passes and the temperature of the accumulated washing water decreases and the shape of the lock operation part 50 is restored, the lock part 51 comes out of the lock hole 52 and the filter knob 47c can be rotated, and the filter 47b is removed. Will be able to. Therefore, the filter 47b can be safely removed without leaking hot washing water.

As described above, in the present embodiment, the outer tub 33 that is swingably supported in the washing machine body 30, the washing / dehydration tub 34 that is rotatably disposed in the outer tub 33, and the outer tub 33. A water supply means 36 for supplying washing water, a heating means 42 for heating the washing water, and a circulation path in which one end is connected to the bottom 33 a of the outer tub 33 and the other end faces the opening 34 b of the washing and dehydrating tub 34. 44, a circulation pump 45 that discharges and circulates the washing water in the outer tub 33 through the circulation path 44 into the washing and dewatering tub 34, and a filter means 47 that is provided in the circulation path 44 and removes foreign matters in the washing water. The filter means 47 includes a filter case 47a that is connected to the circulation path 44, a filter 47b that is detachably mounted in the filter case 47a, and a lock means 48 that holds the filter 47b in a mounted state. When the temperature of the washing water is higher than the predetermined temperature, the hook means 48 is locked, and after washing or after washing, the washing water and the remaining water exist in the outer tub 33 and the circulation path 44 and are higher than the predetermined temperature. In such a case, the locking means 48 is used even when the power is cut off.
Is activated to prevent the filter 47b from being removed, thereby preventing the leakage of hot water and improving the safety.

(Embodiment 2)
FIG. 2 is a cross-sectional view of a main part of the washing machine according to the second embodiment of the present invention. The feature of this embodiment is that a temperature sensing part 49 of the lock means 48 is provided in the circulation path 44 to sense the temperature of the washing water. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  In FIG. 2, the lock means 48 includes a lock portion 51 that prevents the filter 47 b from being detached from the filter case 47 a, a temperature sensing portion 49 that senses the temperature of the wash water, and a temperature sensed by the temperature sensing portion 49. A lock operation unit 50 for driving the lock unit 51 is provided. The temperature sensing unit 49 is provided in the circulation path 44 on the inflow side to the filter case 47a.

  According to the present embodiment, the circulation path 44 extending from the bottom 33a of the outer tub 33 to the filter means 47 is disposed below the bottom 33a of the outer tub 33 so that residual water is easily collected. Even if the amount of water is small, the temperature of the lock unit 51 can be actuated by reliably sensing the temperature, so that the reliability of the lock means 48 can be improved.

(Embodiment 3)
FIG. 3 is a cross-sectional view of a main part of the washing machine according to the third embodiment of the present invention. A feature of this embodiment is that a temperature sensing portion 49 of the lock means 48 is provided in the filter case 47a so as to sense the temperature of the washing water. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  In FIG. 3, the lock means 48 includes a lock unit 51 that prevents the filter 47 b from being detached from the filter case 47 a, a temperature sensing unit 49 that senses the temperature of the washing water, and a temperature sensed by the temperature sensing unit 49. A lock operation unit 50 for driving the lock unit 51 is provided. The temperature sensing part 49 is provided in the lower part of the outer surface of the filter case 47a.

  According to the present embodiment, by providing the temperature sensing portion 49 in the filter case 47a serving as a residual water leakage port, the lock portion 51 can be operated by sensing the temperature of the residual water that leaks first, The reliability of the lock means 48 can be further improved.

(Embodiment 4)
FIG. 4 is a cross-sectional view of a main part of a washing machine according to the fourth embodiment of the present invention. The feature of this embodiment is that the lock means 48 is provided in the filter 47b so as to sense the temperature of the washing water. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  In FIG. 4, the lock unit 48 includes a lock unit 51 that prevents the filter 47 b from being detached from the filter case 47 a, a temperature sensing unit 49 that senses the temperature of the washing water, and a temperature sensed by the temperature sensing unit 49. A lock operation unit 50 for driving the lock unit 51 is provided. The lock means 48 is provided in the filter 47b.

  According to the present embodiment, the lock unit 48 is provided in the filter 47b inserted into the remaining water in the filter case 47a serving as a water leak port, and the sensitivity of the temperature sensing unit 49 is increased to quickly move the lock unit 51. The reliability of the lock means 48 can be further improved.

(Embodiment 5)
FIG. 5 is a cross-sectional view of the main part of the filter means of the washing machine according to the fifth embodiment of the present invention, and shows a locked state by the lock means. FIG. 6 shows the unlocking state of the locking means. The feature of this embodiment is that the temperature sensing part 49a of the locking means 48 is made of a coil-shaped shape memory alloy. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  5 and 6, the temperature sensing portion 49a of the lock means 48 is formed of a shape memory alloy formed in a coil shape. The compression spring 53 is urged in a direction to return to the original state when the temperature sensing portion 49a becomes equal to or lower than the set temperature. The link mechanism 54 is connected to one end of the lock operation unit 50, and is configured such that the lock unit 51 protrudes and retracts from the side of the filter knob 47c by the advancement / retraction operation of the lock operation unit 50 due to expansion / contraction of the temperature sensing unit 49a. ing.

  Further, the filter case 47 a is provided with a lock hole 52 into which the tip of the lock part 51 is inserted at a position facing the lock part 51. The lock operation part 50 is provided so as to be able to advance and retreat by a temperature sensing part 49a and a compression spring 53, and is configured to be slidable in the filter 47b.

  When the heat of the hot water is transmitted to the temperature sensing part 49a and becomes a predetermined temperature (for example, 70 ° C.) or more, the compression spring 53 is compressed by the restoring force of the temperature sensing part 49a and the lock operating part 50 moves in the extending direction. The portion 51 protrudes from the side of the filter knob 47c and is inserted into the lock hole 52. The rotation of the filter knob 47c is restricted, and the filter 47b is held in a mounted state.

  When the temperature of the temperature sensing part 49a falls below a predetermined temperature (for example, 70 ° C.), the restoring force is lost, the repulsive force of the compression spring 53 moves in the direction in which the lock operating part 50 contracts, and the lock part 51 is locked. Leave. The lock 51 is housed inward from the side of the filter knob 47c, and the filter knob 47c can be rotated. Therefore, the filter 47b can be detached from the filter case 47a together with the lock means 48.

  According to the present embodiment, the temperature sensing part 49a is composed of a coil-shaped shape memory alloy that restores its original shape when it reaches the set temperature, and the lock operation part 50 is reliably operated above the set temperature. The reliability of the lock means 48 can be improved and the configuration can be simplified.

(Embodiment 6)
FIG. 7 is a cross-sectional view of main parts of a washing machine according to a sixth embodiment of the present invention. The feature of the present embodiment is that the locking means 48 is constituted by an operating body 55 by liquid expansion having a temperature sensing part 49b, and the temperature sensing part 49b is provided in the outer tub 33 near the heating means 42. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  In FIG. 7, the lock means 48 is constituted by an operating body 55 by liquid expansion having a temperature sensing part 49b. The temperature sensing part 49 b is provided on the bottom 33 a of the outer tub 33 in the vicinity of the heating means 42 disposed on the bottom 33 a of the outer tub 33.

  According to the present embodiment, the temperature of the washing water can be sensed at a position away from the filter 47b, the temperature in the outer tub 33 having the highest residual water temperature is sensed, and the lock unit 51 is sensed. Can be operated, and leakage of warm water can be prevented to improve safety.

  As described above, the washing machine according to the present invention makes it impossible to remove the filter even when the energization is interrupted when the washing water or the remaining water exists in the outer tub or the circulation path and is higher than the predetermined temperature. Therefore, it is possible to prevent leakage of hot water and improve safety, which is useful as a washing machine.

30 Washing machine body 33 Outer tub 34 Washing / dehydration tub 36 Water supply valve (water supply means)
42 Heating means 33a Bottom 34b Opening 44 Circulating path 45 Circulating pump 47 Filter means 47a Filter case 47b Filter 48 Locking means

Claims (6)

An outer tub supported within the washing machine body;
A washing and dewatering tank disposed rotatably in the outer tub;
Water supply means for supplying washing water into the outer tub;
Heating means for heating the washing water;
A circulation path in which one end is connected to the bottom of the outer tub and the other end faces the opening of the washing / dehydrating tub, and washing water in the outer tub is circulated in the washing / dehydrating tub through the circulation path. A circulation pump;
Filter means provided in the circulation path to remove foreign matter in the wash water,
The filter means includes
A filter case communicating with the circulation path;
A filter detachably mounted in the filter case;
Locking means for holding the filter in a mounted state,
The lock unit is a washing machine configured to lock when the temperature of the washing water is higher than a predetermined temperature. The locking means is
A lock portion for preventing the filter from being detached;
A temperature sensing unit that senses the temperature of the washing water;
A lock operation unit that drives the lock unit according to the temperature sensed by the temperature sensing unit,
The washing machine according to claim 1, wherein the temperature sensing unit is provided in the circulation path. The locking means is
A lock portion for preventing the filter from being detached;
A temperature sensing unit that senses the temperature of the washing water;
A lock operation unit that drives the lock unit according to the temperature sensed by the temperature sensing unit,
The washing machine according to claim 1, wherein the temperature sensing unit is provided in the filter case. The locking means is
A lock portion for preventing the filter from being detached;
A temperature sensing unit that senses the temperature of the washing water;
A lock operation unit that drives the lock unit according to the temperature sensed by the temperature sensing unit,
The washing machine according to any one of claims 1 to 3, wherein the lock means is provided in the filter. The locking means is
A lock portion for preventing the filter from being detached;
A temperature sensing unit that senses the temperature of the washing water;
A lock operation unit that drives the lock unit according to the temperature sensed by the temperature sensing unit,
The washing machine according to claim 1, wherein the temperature sensing part is made of a coil-shaped shape memory alloy. The locking means is composed of an operating body by liquid expansion having a temperature sensing part for sensing the temperature of the washing water,
The washing machine according to claim 1, wherein the temperature sensing unit is provided in an outer tub near the heating means.

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