WO2018096912A1

WO2018096912A1 - Washing machine

Info

Publication number: WO2018096912A1
Application number: PCT/JP2017/039849
Authority: WO
Inventors: 博之桐山; 中村　利幸; 裕曵野; 年秀杉本
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2016-11-22
Filing date: 2017-11-06
Publication date: 2018-05-31
Also published as: TWI725251B; PH12019500302A1; SG11201811308UA; CN109477275B; TW201825736A; CN109477275A; MY197799A

Abstract

The present invention comprises: a washing machine main body; a water tank (13) that is supported inside the washing machine main body and that has a drain port in a bottom part thereof; and a heater unit (32) that is disposed below the water tank (13) and that communicates with an inner bottom part of the water tank (13). The heater unit (32) comprises: a heater accommodation container (37) in which a heater (38) that heats washing water is accommodated; a heater that is inserted into the heater accommodation container (37) from an opening (37b) of the heater accommodation container (37), and that heats washing water; and a temperature detection unit (56) that measures the water temperature within the heater accommodation container (37). The water temperature within the water tank (13) is estimated from the water temperature within the heater accommodation container (37) that is measured by the temperature detection unit (56) after a certain amount of time has elapsed from turning OFF the heater.

Description

Washing machine

The present invention relates to a washing machine provided with a heated water generating device for heating washing water.

Patent Document 1 discloses a means for preventing overheating of a washing machine provided with a heated water generating device for heating the washing water. The washing machine includes a first thermistor that senses the heating temperature of the heater, a heater temperature sensing unit that outputs a first temperature sensing signal corresponding to the sensed heater temperature, and a temperature for washing water. A second thermistor, and a water temperature sensing unit that outputs a second temperature sensing signal corresponding to the sensed temperature of the washing water. In addition, a power supply switching unit that receives the first temperature sensing signal, calculates a temperature increment value of the heater with respect to a predetermined time value, and switches the power supplied to the heater according to the power supply switching signal is provided.

A heater temperature increment value with respect to a predetermined time value is calculated from the first temperature sensing signal. When the heater temperature increment value is larger than a predetermined reference value, the power supply switching unit switches the power supplied to the heater. Thus, overheating of the heater can be prevented.

JP-A-6-79089

However, in the conventional configuration, two temperature detection units, mainly a thermistor for measuring the heating temperature of the heater, and a temperature detection unit mainly for the thermistor for measuring the water temperature in the water tank are required.

The present invention provides a highly reliable washing machine capable of preventing overheating of the heater at low cost by detecting the temperature of the heater and the temperature of the water in the water tank with a single temperature detection unit.

The washing machine in the present invention includes a washing machine main body, a water tank supported inside the washing machine main body and having a drain outlet at the bottom, and a drain cock unit connected to the drain outlet of the water tank. A heater unit connected to the drain cock unit and communicating with the inner bottom of the water tank, a heater built in the heater unit for heating the washing water, and a temperature detector for measuring the water temperature in the heater unit are provided. Further, the energization is stopped after the elapse of the first predetermined time from the start of energization of the heater, the water temperature in the heater unit after the elapse of the second predetermined time after the energization of the heater is detected by the temperature detection unit, and the detected water temperature is set. Based on this, the water temperature in the water tank is estimated.

This configuration makes it possible to estimate the water temperature in the water tank together with the detection of the heater temperature using the temperature detection part that measures the water temperature in the heater container, so that there is no need to configure the temperature detection part on the water tank side. Therefore, a highly reliable washing machine that can prevent overheating of the heater at low cost can be provided.

The washing machine according to the present invention includes a washing machine main body, a water tank supported inside the washing machine main body and having a drain outlet at the bottom, and a drain cock unit connected to the drain outlet of the water tank. In addition, a heater unit connected to the drain cock unit and communicating with the inner bottom of the water tank, a heater built in the heater unit for heating the washing water, a temperature detection unit for measuring the water temperature in the heater unit, and the washing in the water tank And a controller that controls energization of the heater so that the water reaches a predetermined target set water temperature. The control unit estimates the water temperature in the water tank from the temperature measured by the temperature detection unit, and determines the first energization time of the heater from at least the water temperature and the amount of water supplied to the water tank. Further, the temperature rise rate in the water tank within the first energization time is calculated based on the temperature measured by the temperature detector, and the wash water in the water tank is calculated from the temperature rise rate and the water temperature in the water tank after the first current energization time. Is configured to calculate the second energization time of the heater until the target set water temperature is reached.

With this configuration, since one heater can detect the heater overheat and control the temperature of the water temperature in the water tank, a low-cost and highly reliable washing machine can be provided.

FIG. 1 is a longitudinal sectional view of a washing machine according to the first embodiment of the present invention. FIG. 2 is a perspective view combining a perspective view of the bottom of the water tub of the washing machine and an exploded perspective view of the heater unit in the first embodiment of the present invention. FIG. 3 is a perspective view of the heater unit of the washing machine according to the first embodiment of the present invention. FIG. 4A is a top view of the heater unit of the washing machine according to the first embodiment of the present invention. 4B is a cross-sectional view taken along the line 4B-4B of FIG. 4A. FIG. 5 is a cross-sectional view of the heater unit of the washing machine according to the first embodiment of the present invention. FIG. 6 is a cross-sectional view of the bottom of the water tub and the heater unit of the washing machine according to the first embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view of a main part of the heater unit in the washing machine according to the first embodiment of the present invention. FIG. 8 is a cross-sectional view combining the cross-sectional view of the bottom of the washing tub of the washing machine and the 8-8 cross-sectional view of FIG. 4A according to the first embodiment of the present invention. FIG. 9 is an enlarged cross-sectional view of a main part of the heater unit of the washing machine according to the first embodiment of the present invention. FIG. 10 is a partial cross-sectional perspective view showing the flow of washing water in the heater unit of the washing machine according to the first embodiment of the present invention. FIG. 11 is a graph showing the water temperature in the heater storage container and the water temperature in the water tank of the washing machine in the first embodiment of the present invention. FIG. 12 is an exploded perspective view of the heater unit of the washing machine according to the third embodiment of the present invention. FIG. 13 is a cross-sectional view of the bottom of the washing tub, the drain cock unit, and the heater unit of the washing machine according to the third embodiment of the present invention. FIG. 14 is a perspective view of the heater unit of the washing machine according to the third embodiment of the present invention. FIG. 15 is a perspective view of the heater unit of the washing machine according to the third embodiment of the present invention. FIG. 16 is a cross-sectional view showing the flow of washing water in the heater unit of the washing machine according to the third embodiment of the present invention.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[table of contents]
1. 1. First embodiment 1-1. Configuration 1-1-1. Structure of washing machine 1-1-2. Configuration of heater unit 1-2. Operation of washing machine 1-3. Flow of washing water in heater unit 1-4. Heater unit status check and maintenance method 1-5. 1. Water temperature detection method in the tank Second embodiment 2-1. 2. Water temperature control method in the aquarium Third embodiment 3-1. Configuration of heater unit 3-2. 3. Flow of washing water in the heater unit Other Embodiments [1. First Embodiment]
Hereinafter, the first embodiment will be described with reference to FIGS.

[1-1. Constitution]
[1-1-1. Structure of washing machine]
FIG. 1 is a longitudinal sectional view of the washing machine according to the first embodiment.

In FIG. 1, the washing machine main body 11 has a water tank 13 supported by a suspension 12 for vibration isolation. Inside the water tub 13, a washing / dehydrating tub 15 serving both as a washing tub and a dewatering tub is rotatably provided. A pulsator 18 is rotatably disposed at the bottom of the washing and dewatering tank 15.

A transmission mechanism 20 is disposed on the outer bottom of the water tank 13. The transmission mechanism 20 includes a reduction gear (not shown) for washing, a switching clutch (not shown) for the washing / dehydrating shaft 14, and a brake (not shown) for stopping the washing / dehydrating tub 15. Built in.

A motor 21 is attached to the outer bottom of the water tank 13, and a motor-side pulley 22 is attached to the motor 21. A mechanical pulley 23 is connected to the washing / dehydrating shaft 14, and the motor pulley 22 and the mechanical pulley 23 are connected by a belt 24. With such a configuration, the power of the motor 21 is transmitted to the washing / dehydrating shaft 14 via the belt 24. Further, by controlling the switching clutch, it is possible to realize a state in which only the pulsator 18 is rotated using the motor 21 and a state in which the pulsator 18 and the washing and dewatering tub 15 are simultaneously rotated.

The upper frame 25 is arranged on the upper part of the washing machine main body 11. A laundry loading / unloading port 26 for communicating the washing and dewatering tub 15 and the outside is formed at a substantially central portion of the upper frame 25, and the door 27 can freely open and close the laundry loading / unloading port 26. Covering. On the rear side of the upper frame 25, an operation display unit 29 is provided for performing various input settings and displaying the setting contents. A water supply valve 30 and a water injection case 31 that can be opened and closed by electromagnetic force are disposed inside the upper frame 25 on the rear side.

A control unit (not shown) is provided inside the washing machine body 11 to control the motor 21 and the like, to sequentially control a series of steps of washing, rinsing, and dewatering, and to control the temperature of the washing water. ing.

A fluid balancer 16 is disposed above the washing and dewatering tank 15. A back plate 17 is detachably disposed on the back surface of the washing machine body 11 so as to cover the back surface opening (inspection port) 11a.

FIG. 2 is a water tank bottom perspective view and an exploded perspective view of the heater unit of the washing machine in the present embodiment. As shown in FIG. 2, the bottom of the water tank 13 has a first drain port 33a and a second drain port 33b.

[1-1-2. Heater unit configuration]
FIG. 3 is a perspective view of the heater unit of the washing machine in the present embodiment. FIG. 4A is a top view of the heater unit of the washing machine in the embodiment. 4B is a cross-sectional view taken along the line 4B-4B of FIG. 4A. FIG. 5 is a cross-sectional view of the heater unit of the washing machine in the present embodiment. FIG. 6 is a cross-sectional view of the bottom of the water tub and the heater unit of the washing machine in the present embodiment. FIG. 7 is an enlarged cross-sectional view of a main part of the heater unit of FIG. FIG. 8 is a bottom view of the water tub of the washing machine according to the present embodiment and a cross-sectional view taken along 8-8 in FIG. 4A. FIG. 9 is an enlarged cross-sectional view of a main part of the heater unit of FIG.

Hereinafter, the heater unit 32 of the washing machine in the present embodiment will be described.

As shown in FIG. 1, a heater unit 32 is fixed at an outer bottom portion on the back side of the water tank 13 where the back plate 17 can be removed for maintenance.

As shown in FIG. 2, the heater unit 32 includes a heater housing container 37 having a substantially rectangular parallelepiped shape whose both ends in the longitudinal direction are open, a heater 38 inserted from the first opening of the heater housing container 37, and heater housing. The sheet metal member 36 is inserted from the second opening of the container 37 and covers the heater 38, and the lid body 51 covers the second opening into which the sheet metal member 36 is inserted.

The following describes each part.

[A. Heater container 37]
The heater container 37 is made of a heat-resistant resin and has a substantially rectangular parallelepiped shape with both ends in the longitudinal direction opened. Of the openings in the longitudinal direction of the heater container 37, the first opening is a heater insertion opening 37 b into which the heater 38 is inserted, and the second opening is a sheet metal that is covered with the lid 51 by inserting the sheet metal member 36. This is a member insertion opening 37c.

In the vicinity of the heater insertion opening 37b on the upper surface of the heater container 37, a cylindrical outflow passage portion 37g communicating with the second drain port 33b at the bottom of the water tank 13 is formed.

A drain cock connection opening 37 a communicating with the drain cock unit 34 is formed in the vicinity of the sheet metal member insertion opening 37 c on the side surface adjacent to the surface having the outflow path portion 37 g. The drain cock unit 34 and the heater container 37 are detachably attached by screw fastening (not shown) or the like.

As shown in FIG. 2, the drain cock unit 34 is welded and fixed by a welding boss 45 at a position where the inlet 34 a communicates with the first drain port 33 a at the bottom of the water tank 13. The water tank 13 and the heater container 37 are connected in communication via a drain cock unit 34. As shown in FIGS. 2, 3, and 4B, the drain cock unit 34 has a drain path opening 34c. The drainage channel side opening 34c is connected to the drainage channel 41 (see FIG. 1). By opening a drain valve (not shown) of the drain cock unit 34, the wash water in the water tank 13 and the heater container 37 is drained to the outside of the washing machine body 11 through the drain path 41.

In this embodiment, the water tank 13 and the drain cock unit 34 are welded and fixed. However, the present invention is not limited to this and may be detachably attached by screw fastening or the like.

[B. Sheet metal member 36]
As shown in FIG. 2, the sheet metal member 36 surrounding the heater 38 has a substantially rectangular parallelepiped shape with both ends in the longitudinal direction opened. The sheet metal member 36 is inserted into the heater housing 37 from the sheet metal member insertion opening 37c in the forward direction.

Since the radiant heat generated from the heater 38 is conducted and diffused through the sheet metal member 36, it is possible to reduce the risk that the heat concentrates and melts in a part of the heater housing container 37 to generate holes.

The sheet metal member 36 is composed of two sheet metal parts. As shown in FIGS. 2 and 6, one end of the sheet metal member 36 is spot welded along a spot weld portion 42 in the longitudinal direction. As shown in FIGS. 6 and 7, the other end of the sheet metal member 36 has a separation portion 36 a that is not welded and has a constant gap. Therefore, the sheet metal member 36 is substantially U-shaped. The sheet metal member 36 is formed with a support piece 40 recessed inward by bending. The support piece 40 fixes the heater 38 accommodated in the heater accommodating container 37 so as not to move.

A method for fixing the sheet metal member 36 and the heater container 37 will be described with reference to FIGS. 5, 6, and 7.

As shown in FIG. 5, a belt-like rib 37 d is formed on the inner wall of the heater housing 37 so as to correspond to the position of the separating portion 36 a in a state where the sheet metal member 36 is inserted into the heater housing 37. . When the sheet metal member 36 is inserted into the heater accommodating container 37 from the sheet metal member insertion opening 37c in the forward direction, the strip-shaped rib 37d is positioned in the separation portion 36a.

As shown in FIGS. 6 and 7, the width dimension W of the strip-shaped rib 37 d at the position where it abuts on the sheet metal member 36 in the state where the sheet metal member 36 is inserted into the heater housing container 37 is from the rear side toward the front side. And wide.

The width dimension W1 of the end of the sheet metal member insertion opening 37c (rear side) of the belt-shaped rib 37d in FIG. 7 is larger than the separation width of the separation portion 36a in a state where the sheet metal member 36 is accommodated in the heater accommodating container 37. It is narrowly formed. The width dimension W2 of the heater insertion opening 37b side (front side) end of the strip-shaped rib 37d in FIG. 7 is wider than the separation width of the separation portion 36a in a state where the sheet metal member 36 is housed in the heater housing container 37. It is formed as follows. Further, as shown in FIG. 8, the inner wall lower surface 39a of the heater container 37 is directed upward from the sheet metal member insertion opening 37c side (rear side) toward the heater insertion opening 37b side (front side). 39b is gradually inclined downward. Therefore, as the sheet metal member 36 is inserted from the sheet metal member insertion opening 37c side (rear side) toward the heater insertion opening 37b side (front side), the separation width of the separation part 36a becomes narrower.

With this configuration, when the sheet metal member 36 is inserted into the heater housing container 37 from the sheet metal member insertion opening 37c side (rear side) toward the heater insertion opening 37b side (front side), a belt-shaped rib is inserted from the middle of the insertion. The width W of 37 d is wider than the separation width of the separation portion 36 a of the sheet metal member 36. Therefore, by press-fitting the sheet metal member 36 into the heater accommodating container 37, the end of the separating portion 36a of the sheet metal member 36 is recessed into the belt-shaped rib 37d. In this manner, the sheet metal member 36 can be supported and fixed in the heater accommodating container 37, and the sheet metal member 36 can be prevented from rattling during the dewatering rotation of the washing and dewatering tank 15.

In the present embodiment, the sheet metal member 36 is configured by spot welding two sheet metals, but may be configured by molding one sheet metal, for example.

[C. Heater 38]
The heater 38 will be described with reference to FIG.

The heater 38 is inserted from the heater insertion opening 37 b of the heater container 37.

The heater 38 includes a heating part 38a, a terminal part 38b, and a connection part 38c.

The heating unit 38 a is located inside the heater storage container 37 and generates heat for heating the washing water in the heater storage container 37. Further, as shown in FIG. 2, the heating unit 38a is bent many times on the same plane. With this configuration, since the surface area of the heating unit 38a is increased, the washing water can be efficiently heated.

The terminal part 38b is electrically connected to the heating part 38a. The terminal portion 38b is electrically connected to an external power source (not shown) located outside the heater housing 37 and a control device (not shown). The electric power from the external power source is supplied to the heating unit 38a through the terminal unit 38b.

The connecting part 38c is interposed between the heating part 38a and the terminal part 38b. The connecting portion 38c is provided with a flexible member 38d having a size corresponding to the heater insertion opening 37b of the heater container 37. In FIG. 8, the heater 38 can be fixed in the heater container 37 by tightening the nut 43 in a state where the heating portion 38 a is inserted into the heater insertion opening 37 b. That is, by tightening the nut 43, a forward force is applied to the bolt 44 and the pressure contact plate 47 welded to the bolt 44, and the flexible member 38d is compressed in the front-rear direction, so that it expands in the circumferential direction. The heater insertion opening 37b can be sealed. With this configuration, it is possible to prevent the washing water in the heater container 37 from leaking from the heater insertion opening 37b. The flexible member 38d is formed of packing such as rubber that is elastically deformed.

Further, as shown in FIG. 2, a temperature detector 56 that measures the water temperature in the heater container 37 is disposed in the connection portion 38 c. The temperature detection unit 56 includes a thermistor or the like.

[D. Lid 51]
As shown in FIGS. 8 and 9, the lid body 51 detachably covers the sheet metal member insertion opening 37 c of the heater housing container 37 by screw fastening (not shown).

In order to remove the lid 51 and check the inside of the heater container 37 and maintain the heater unit 32, the sheet metal member insertion opening 37c covered by the lid 51 has a rear opening 11a of the washing machine main body 11. It is provided on the back side.

The sheet metal member insertion opening 37 c covered with the lid 51 is attached to a position facing the heater 38 inserted into the heater housing container 37. With this configuration, the state of the heater 38 can be easily visually recognized by removing the lid 51 from the heater accommodating container 37.

The lid 51 is formed with an inclined rib 51 a that is a convex rib that presses the sheet metal member 36 inserted into the heater housing 37 against the inner wall surface of the heater housing 37. The inclined rib 51a has an inclined surface facing the sheet metal member 36 accommodated in the heater accommodating container 37, and the inclined surface faces the heater accommodating container 37 from the “front” side to the “rear” side indicated by the arrow in FIG. It is inclined so as to approach the inner wall surface. With this configuration, the end of the sheet metal member 36 inserted into the heater accommodating container 37 on the side of the sheet metal member insertion opening 37c is widened toward the inner wall lower surface 39a and the inner wall upper surface 39b by the inclined rib 51a. The sheet metal member insertion opening 37c side (rear side) end of the sheet metal member 36 inserted into the heater accommodating container 37 is widened toward the inner wall lower surface 39a and the inner wall upper surface 39b by the inclined rib 51a.

Further, with the heater housing container 37 attached to the bottom of the water tank 13, ribs 37e (see FIG. 6) for supporting the sheet metal member 36 are extended and formed on the inner wall lower surface 39a and the inner wall upper surface 39b of the heater housing container 37. Yes. The rib 37e prevents the heat of the sheet metal member 36 heated by the heater 38 from being directly transmitted to the inner wall lower surface 39a and the inner wall upper surface 39b.

With this configuration, the sheet metal member 36 is supported and fixed by the inclined rib 51 a and the rib 37 e by covering the sheet metal member insertion opening 37 c with the lid 51 in a state where the sheet metal member 36 is inserted into the heater housing container 37. The Therefore, the sheet metal member 36 is prevented from swinging in the heater housing container 37.

Thus, the heater unit 32 is configured.

[1-2. Operation of washing machine]
Next, the operation of the washing machine in the present embodiment will be described.

The user opens the door 27, puts clothes into the washing / dehydrating tub 15 from the laundry loading / unloading port 26, closes the door 27, and operates the operation display unit 29 to start the hot water washing course.

When the washing process is started, the water supply valve 30 is opened, and water is poured into the water tank 13 from the water pouring case 31. The injected water flows into the heater accommodating container 37 from the first drain port 33a and the second drain port 33b at the bottom of the water tank 13.

Here, in the warm water washing course, after the washing process with the heated water by the heater 38 is completed, the rinsing and dehydration processes are executed.

In the hot water washing course, when the water in the water tank 13 reaches a predetermined water level by pouring water into the water tank 13, the heater 38 of the heater unit 32 is turned on. The control device controls the temperature of the washing water by turning the heater 38 on and off according to the temperature of the washing water in the water tank. For the method of detecting the water temperature in the tank, see [1-5. This will be described in [Method for detecting water temperature in water tank].

When the water temperature in the water tank 13 reaches a predetermined temperature M1 (for example, 55 ° C.), the heater 38 is turned off. In addition, when the measured water temperature in the water tank 13 falls to a predetermined temperature M2 or lower (for example, 53 ° C. or lower), the heater 38 is turned on. By this method, the washing water in the water tank 13 can be adjusted to a predetermined water temperature.

The predetermined temperatures M1 and M2 may be set for each operation course (for example, a sterilization course or a mud dirt course). By changing the predetermined temperatures M1 and M2 depending on the operation course, the washing water can be adjusted to a water temperature suitable for the purpose of each operation course.

Further, after the hot water washing is completed, the operation of adding water to the washing and dewatering tank 15 and stirring by the pulsator 18 until the water temperature in the water tank 13 becomes a predetermined temperature or lower (for example, 50 ° C. or lower) may be repeated. Good. When the water temperature in the water tank 13 becomes 50 ° C. or lower, the drain valve of the drain cock unit 34 is opened, and the washing water is drained to the outside of the washing machine main body 11. When the water temperature in the water tank 13 is equal to or higher than a predetermined temperature (for example, 50 ° C. or higher) and the water level in the water tank 13 reaches a limit, temporary drainage is performed for a predetermined time.

This configuration improves the safety because the selected water can be drained with the water temperature lowered even in an environment where the drainage drips down to the road surface.

On the other hand, if the outflow path 37g of the heater container 37 is blocked by clothes lint or the like, the flow of water between the heater container 37 and the water tank 13 may be hindered. When the flow of water between the heater container 37 and the water tank 13 is inhibited, it is assumed that the heater unit 32 is overheated even though the water temperature in the water tank is equal to or lower than the predetermined temperature M1. In such a case, when the measured water temperature of the temperature detector 56 that detects the water temperature in the heater container 37 reaches the heater overheat set temperature (for example, 95 ° C.), the heater 38 is controlled to be turned off. Thus, overheating in the heater unit 32 can be prevented, and generation of scale and deterioration of the heater container 37 can be suppressed.

[1-3. Flow of washing water in the heater unit]
FIG. 10 is a partial cross-sectional perspective view showing the flow of washing water in the heater unit of the washing machine in the present embodiment.

The flow of washing water in the heater unit 32 when the heater 38 is turned on in the hot water washing course will be described with reference to FIG.

An outflow path portion 37g that communicates with the inner bottom portion of the water tank 13 is formed at the base side of the heating portion 38a on the upper surface of the heater container 37, and the inner bottom portion of the water tank 13 is formed on the side of the tip of the heating portion 38a on the side surface of the heater container A drain cock unit 34 that communicates with is connected.

The washing water heated in the heater container 37 and having a high water temperature rises in the heater container 37.

Here, since the outflow passage portion 37g is closer to the drain cock connection opening 37a than the heater 38, the water temperature in the heater container 37 is the drain cock when the heater 38 is turned on. The outflow path portion 37g is higher than the connection opening portion 37a. Therefore, the wash water that has risen in the heater storage container 37 passes through the outflow path portion 37g and is discharged to the water tank 13 as indicated by an arrow D in FIG.

In order to compensate for the high-temperature washing water discharged from the heater container 37 to the water tank 13, the low-temperature and heavy specific washing water in the water tank 13 is discharged from the inlet 34a through the drain cock unit 34 as shown by an arrow C in FIG. It passes through the drain cock front path 34b upstream of the cock and flows into the inner bottom portion of the heater container 37. The washing water flowing into the heater container 37 is heated by effectively using the radiant heat of the heater 38 while flowing from the vicinity of the tip of the heating portion 38a of the heater 38 to the vicinity of the root, so that the washing water is efficiently heated. can do.

Thus, by providing two paths (inlet 34a, outflow path part 37g) which connect water tank 13 and heater storage container 37 in a position where the distance from heater 38 differs, washing water in each path is provided. By utilizing the difference in water temperature, the washing water in the water tank 13 and the washing water in the heater accommodating container 37 can be circulated by natural convection. For this reason, it is possible to reduce the number of parts and reduce the cost without requiring an external force such as a pump.

Further, since the heater container 37 has a smaller capacity than the water tank 13, the temperature of the washing water in the heater container 37 is higher than that of the washing water in the water tank 13, and the water temperature is higher. Therefore, bacteria and the like contained in the wash water flowing into the heater container 37 can be effectively sterilized.

Furthermore, by rotating the pulsator 18 at regular intervals, the washing water in the water tank 13 is stirred, and the water temperature in the water tank 13 can be made uniform.

In the present embodiment, the larger the opening area of the first drain port 33a and the second drain port 33b, the more the circulation of the washing water between the heater unit 32 and the water tank 13 can be made active. However, when the first drainage port 33a and the second drainage port 33b are formed in a perfect circle shape and the opening area is increased, the welding boss 45, the female screw 46, and the like around the first drainage port 33a and the second drainage port 33b. In order to interfere, it is necessary to greatly modify the bottom of the water tank 13.

Therefore, as shown in FIG. 2, the first drainage port 33a is formed in an approximately elliptical shape, so that the opening area of the first drainage port 33a is increased without changing the positions of the welding boss 45 and the female screw 46. it can. Therefore, it is possible to efficiently circulate the washing water in the water tank 13 and the heater container 37 at a low cost without investing a large amount of molds.

8, the inner wall lower surface 39a on the bottom side of the heater housing 37 is gradually inclined downward from the heater insertion opening 37b toward the drain cock connection opening 37a. With this configuration, at the time of draining, the washing water in the heater container 37 flows toward the drain cock connection opening 37a, passes through the drain cock unit 34, the drain path 41 (see FIG. 1), and the washing machine main body 11. Leaks out of the water. Therefore, it is possible to prevent the washing water and foreign matter from staying in the heater container 37 during drainage.

[1-4. Heater unit status check and maintenance method]
There is a possibility that heated water in the heater accommodating container 37 cannot flow out to the water tank 13 when foreign matters such as lint generated from clothing adhere to the heater 38 or block the outflow path portion 37g. . In addition, a problem may occur in the components of the heater unit 32. Therefore, confirmation of the state in the heater unit 32 and repair are needed as needed.

Hereinafter, the state confirmation and maintenance method in the heater unit 32 will be described.

In order to check the state of the heater unit 32, the back plate 17 covering the back opening 11a on the rear side of the washing machine body 11 is removed, and the lid of the heater container 37 attached to the bottom of the water tank 13 from the back opening 11a. Remove the body 51. Since the heater container 37 and the lid 51 are fixed by screw fastening, the lid 51 can be removed by removing the screw.

By this method, the state of the heater 38 in the heater container 37 can be confirmed from the back opening 11a of the washing machine body 11, and lint attached to the surface of the heater 38 can be removed as necessary. Therefore, since it is not necessary to attach or detach the lead wire connector connected to the heater 38, the heater 38 can be easily checked and maintained.

Further, when it is desired to repair or replace the sheet metal member 36, it can be removed by pulling out the sheet metal member 36 from the heater accommodating container 37, and repair and replacement are possible.

Further, the heater unit 32 and the water tank 13, and the heater unit 32 and the drain cock unit 34 are fastened by screws or the like (not shown) and are detachably attached. With this configuration, when it is necessary to remove foreign matter that has entered the heater unit 32 or when it is necessary to replace the heater unit 32, the washing machine body 11 is laid down sideways from the bottom of the washing machine body 11. The heater unit 32 can be removed from the water tank 13 and the drain cock unit 34, and maintenance by the heater unit 32 alone becomes possible. Further, since only the damaged parts of the heater unit 32 can be maintained, the time and cost required for repair can be reduced.

[1-5. Water temperature detection method in the aquarium]
FIG. 11 is a graph of the water temperature in the heater storage container 37 and the water temperature in the water tank 13 of the washing machine in the present embodiment.

When the heater 38 is turned on at time Ta 0, the water in the heater container 37 is heated by the heater 38. Since the heater container 37 has a smaller volume than the water tank, the water temperature in the heater container 37 is normally 10 to 40 ° C. higher than the water temperature in the water tank 13, but at time Ta1, the heater 38 is turned off. When a predetermined time elapses, the water temperature in the water tank 13 and the water temperature in the heater accommodating container 37 are gradually equalized and become substantially the same water temperature at time Ta2.

Hereinafter, a method for estimating the water temperature in the water tank 13 using the temperature detection unit 56 disposed in the heater 38 will be described.

In the hot water washing course, the heater unit 32 is turned on when a predetermined water level is reached by pouring water into the water tank 13. The time at this time is time Ta0. Next, after a predetermined time has elapsed since the heater 38 was turned on (the time at this time is set as time Ta1), the heater 38 is turned off. After the heater 38 is turned off, the temperature detector 56 causes the heater to be heated by a temperature detection unit 56 after a predetermined time has elapsed when the water temperature in the heater container 37 and the water temperature in the water tank 13 are substantially uniform. By measuring the water temperature of the storage container 37, the water temperature in the water tank 13 can be estimated.

The ON time of the heater 38 (between time Ta0 and time Ta1) is preferably calculated based on the output of the heater 38, the amount of water in the water tank 13, the amount of clothing, and the like. For example, when the heater output is 1500 W, the amount of water in the water tank 13 is 66 L, the amount of clothing is 5 kg, and heating from an initial water temperature of 20 ° C. to a predetermined temperature of 55 ° C. is about 130 minutes.

The predetermined time (between time Ta1 and time Ta2) for turning off the heater 38 is preferably, for example, 1 to 5 minutes.

After turning off the heater 38 for a predetermined time, the pulsator 18 is rotated for a predetermined time, whereby the washing water in the water tank 13 is agitated, and the equilibrium of the water temperature difference between the water tank 13 and the heater container 37 can be promoted. Therefore, the water temperature difference between the heater container 37 and the water tank 13 is reduced in a short time, and the water temperature in the water tank 13 can be accurately detected.

By this method, the temperature of the washing water in the water tank 13 can be adjusted using the temperature detection unit 56 that measures the water temperature in the heater housing 37. Therefore, it is not necessary to provide a water temperature detection part in the water tank, and a low-cost and highly reliable washing machine can be provided.

[2. Second Embodiment]
Next, the washing machine in the 2nd Embodiment of this invention is demonstrated.

Since the components of the washing machine in the present embodiment are the same as those in the first embodiment, the same components are denoted by the same reference numerals, and the description of each component is omitted.

[2-1. Water temperature control method in the aquarium]
Here, in the washing machine in the present embodiment, a control method for adjusting the washing water in the water tank 13 to a predetermined target set water temperature (for example, 53 ° C.) using the temperature detection unit 56 will be described.

The washing machine in the present embodiment includes a washing machine main body 11, a water tank 13 supported in the washing machine main body 11 and having a drain outlet at the bottom, and a drain cock unit 34 connected to the drain outlet of the water tank 13. Prepare. Further, a heater unit 32 connected to the drain cock unit 34 and communicating with the inner bottom of the water tank 13, a heater 38 built in the heater unit 32 for heating the washing water, and a temperature detection unit for measuring the water temperature in the heater unit 32. 56. Furthermore, it has a control part (not shown) which controls electricity supply of the heater 38 so that the washing water in the water tank 13 may reach a predetermined target set water temperature, and the control part is after the water supply to the water tank 13 is completed. The first energization time of the heater 38 is calculated and determined from at least the water temperature and the amount of water supplied into the water tank 13, and the heater 38 is energized for the first energization time. Here, the heater 38 may continue to be energized during the first energization time, or may be intermittently energized during the first energization time.

Further, the control unit calculates the silencing speed Vt of the washing water in the water tub 13 based on the temperature measured by the temperature detection unit 56 within the first energization time. Further, the control unit calculates the second energization time of the heater 38 until the washing water in the water tank 13 reaches the target set water temperature from the temperature increase rate Vt and the water temperature in the water tank 13 after the end of the first energization time. To do. Then, the control unit energizes the heater 38 during the calculated second energization time. Here, the heater 38 may continue to be energized during the second energization time, or may be intermittently energized during the second energization time.

After the heater 38 is continuously energized for the second energization time, the temperature detection unit 56 estimates the water temperature in the water tank 13 and compares it with the target set water temperature. When the water temperature is lower than the target set water temperature, the heater 38 is energized for a predetermined time, and the water temperature in the water tank 13 is estimated again based on the measured temperature of the temperature detector 56. When the water temperature is higher than the target set water temperature, the water temperature in the water tank 13 is estimated again based on the measured temperature of the temperature detector 56 without energizing the heater 38 for a predetermined time.

By this method, it is possible to detect the overheating of the heater 38 and adjust the temperature of the washing water in the water tank 13 only by the temperature detection unit 56 provided in the heater housing container 37. Therefore, a highly reliable washing machine can be provided at a low cost.

[3. Third Embodiment]
In the washing machine according to the first embodiment, the heater container 37 and the bottom surface of the water tank 13 are connected by two paths, and the heated washing water in the heater container 37 and the washing water in the water tank 13 circulate. It was set as the structure to do. However, in the first embodiment, it is necessary to provide the water tank 13 with a plurality of drain ports. Therefore, the washing machine in the third embodiment is configured so that the heater container and the bottom surface of the water tank are connected by one path.

Hereinafter, the third embodiment will be described with reference to FIGS. In addition, FIG. 1 is referred about the longitudinal cross-sectional view of a washing machine.

The bottom of the water tank 13 of the washing machine in the first embodiment had the first drain port 33a and the second drain port 33b, but the bottom of the water tank 113 of the washing machine in the present embodiment, A drainage port 133 is provided. Since the other structure of the washing machine in this Embodiment is the same as that of the washing machine in 1st Embodiment, description is abbreviate | omitted.

[3-1. Heater unit configuration]
FIG. 12 is an exploded perspective view of the heater unit of the washing machine in the present embodiment. FIG. 13 is a cross-sectional view of the bottom of the water tank, the drain cock unit, and the heater unit of the washing machine in the present embodiment. 14 and 15 are perspective views of the heater unit of the washing machine according to the present embodiment.

Hereinafter, the heater unit 132 of the washing machine in the present embodiment will be described.

As shown in FIG. 13, the heater unit 132 is fixed at a position where the back plate 17 (see FIG. 1) can be removed and maintained on the outer bottom portion on the back side of the water tank 113.

As shown in FIG. 12, the heater unit 132 includes a substantially rectangular parallelepiped heater accommodating container 137 that is open at both ends in the longitudinal direction, a heater 138 that is inserted from one opening of the heater accommodating container 137, and a heater accommodating container. The sheet metal member 136 is inserted from the other opening 137 and covers the heater 138, and the lid 151 covers the opening of the heater housing container 137 into which the sheet metal member 136 is inserted.

Hereinafter, each part will be described. In addition, since the heater 138 of the washing machine in this Embodiment is the structure similar to the heater 38 concerning 1st Embodiment, description is abbreviate | omitted.

[A. Heater container 137]
As shown in FIG. 12, the heater container 137 is made of a heat-resistant resin and has a substantially rectangular parallelepiped shape with both ends in the longitudinal direction opened.

A drain cock connection opening 137 a communicating with the drain cock unit 134 is provided in the vicinity of the sheet metal member insertion opening 137 c on the side surface in the longitudinal direction of the heater container 137. In the washing machine according to the first embodiment, the cylindrical outflow path portion 37g communicating with the second drain outlet 33b at the bottom of the water tank 13 is formed on the upper surface of the heater container 37. Such a path is not formed in the heater storage container 137 of the machine. Other configurations of the heater storage container 137 are the same as the configuration of the heater storage container 37 of the first embodiment.

As shown in FIG. 13, the drain cock unit 134 is detachably attached to a drain port 133 and a screw at the bottom of the water tank 113. As shown in FIG. 13, a part of the drain cock unit 134 is formed in an L shape extending toward the heater container 137, and the water tank 113 and the heater container 137 are connected to each other via the drain cock unit 134. Has been. As shown in FIG. 13, the drain cock unit 134 is provided with a partition wall 146 that separates a path communicating from the water tank 113 in the drain cock unit 134 to the heater container 137. The partition wall 146 includes a vertical portion 146a and a horizontal portion 146b extending from the lower end of the vertical portion 146a toward the heater 138, and has an L-shaped cross section. Due to the partition wall 146, the water channel in the drain cock unit 134 is located on the left side of the vertical part 146a and the lower side of the horizontal part 146b in FIG. It isolate | separates into the outflow path 135b located.

In the present embodiment, as shown in FIG. 13, the inclination angle of the inner wall upper surface 139b of the heater housing 137 and the inclination angle of the inner wall lower surface 139a are formed at substantially the same angle. With this configuration, as shown in FIGS. 14 and 15, even if the heater container 137 is turned upside down, it can be used by being inserted into the bottom of the water tank 113 via the drain cock unit 134. Therefore, the heater unit 132 can be arranged for each washing machine model in consideration of the center of gravity of vibration, the arrangement of parts, and the like.

[B. Sheet metal member 136]
As shown in FIG. 12, the sheet metal member 136 surrounding the heater 138 has a substantially rectangular parallelepiped shape with one end in the longitudinal direction opened. The sheet metal member 136 is formed by molding a sheet metal part into a rectangular parallelepiped shape. As shown in FIG. 13, one end of the sheet metal member 136 in the longitudinal direction has a separation portion 136a that is not welded and has a constant gap. A support piece 140 that supports and fixes the heater 138 is welded to the inner surface of the sheet metal member 136. The support piece 140 fixes the heater 138 accommodated in the heater accommodating container 137 so as not to move.

Note that the sheet metal member 136 may be configured by, for example, welding two sheet metals by spot welding or the like.

The method for fixing the sheet metal member 136 and the heater container 137 is the same as in the first embodiment.

[C. Lid 151]
As shown in FIG. 13, the lid 151 covers the sheet metal member insertion opening 137c of the heater container 137 so as to be detachable by fastening screws (not shown).

In the lid 51 of the washing machine in the first embodiment, inclined ribs 51a (see FIG. 6) that are convex ribs are formed, but in the lid 151 of the washing machine in the present embodiment, Such ribs are not formed. The other configuration of the lid 151 in the second embodiment is the same as the configuration of the lid 51 in the first embodiment.

In this way, the heater unit 132 is configured.

[3-2. Flow of washing water in the heater unit]
FIG. 16 is a cross-sectional view showing a flow of washing water in the heater unit of the washing machine in the present embodiment. The flow of the washing water in the heater unit 132 in a state where the heater 138 is turned on in the hot water washing course will be described with reference to FIG.

As shown in FIG. 12, a drain cock unit 134 communicating with the bottom of the water tank 113 is connected to the longitudinal side surface of the heater container 137. As shown in FIG. 13, a partition wall 146 is provided inside the drain cock unit 134. The partition wall 146 is formed in a substantially L shape that extends downward toward the heater 138. Due to the partition wall 146, the low-temperature washing water in the inflow path 135a flowing from the water tank 113 toward the heater storage container 137 and the high-temperature washing water in the outflow path 135b flowing from the heater storage container 137 toward the water tank 113 are Mixing in the drain cock unit 134 can be prevented, and washing water can be circulated efficiently.

When the heater 138 is turned on in a state where the washing water is filled in the heater container 137, the washing water in the heater container 137 is heated by the heater 138 and moves up in the heater container 137, and the arrow B in FIG. In this way, the water is discharged from the outflow path 135b to the water tank 113.

On the other hand, in order to make up for the high-temperature washing water discharged from the heater container 137 to the water tank 113, the low-temperature and heavy specific washing water in the water tank 113 passes through the inflow path 135a as shown by the arrow A in FIG. It flows into the container 137. Since the heated washing water in the heater container 137 moves upward, the low-temperature washing water in the water tank 113 easily flows from the inflow path 135a to the bottom of the heater container 137.

The washing water that has flowed into the heater storage container 137 is heated by the heater 138, rises in the heater storage container 137, and flows out from the outflow path 135b to the water tank 113.

In this way, the heater housing container 137 and the bottom of the water tank 113 communicate with each other through one path, and the washing water is circulated by natural convection due to the temperature difference of the washing water, so that the model with and without the heater unit 132 is provided. A common mold for the water tank 113 can be used. For this reason, the manufacturing cost at the time of development for implement | achieving a hot water specification function can be held down low. Furthermore, the heater unit 132 can be provided externally as necessary.

As shown in FIGS. 13 and 16, the upper end portion of the vertical portion 146a of the partition wall 146 is located above the inflow port 134a. By setting it as this structure, since it can suppress that the hot wash water discharged | emitted from the outflow path 135b to the water tank 113 enters into the inflow path 135a, the wash water in a water tank can be heated efficiently.

Further, by rotating the pulsator 18 at regular intervals, the washing water in the water tank 113 is stirred, and the water temperature in the water tank 113 and the water temperature in the heater container can be made uniform in a short time.

Further, as shown in FIG. 16, the inner wall upper surface 139b on the water tank 13 side (upper side) of the heater container 137 is located on the water tank side from the heater insertion opening 137b (see FIG. 12) toward the drain cock connection opening 137a. Inclined gradually (upward). With this configuration, when the washing water is supplied into the heater container 137, the air accumulated in the heater container 137 is easily discharged from the heater container 137 toward the water tank 113. Therefore, air accumulation in the heater storage container 137 can be prevented, and the risk of emptying can be reduced.

[4. Other Embodiments]
As described above, the first to third embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments that have been changed, replaced, added, omitted, and the like. In addition, it is possible to combine the components described in the first to third embodiments to form a new embodiment.

Therefore, other embodiments will be exemplified below.

In the first embodiment, the drainage cock unit 34 and the outflow path portion 37g formed in the heater accommodating container 37 form a connection path between the water tank 13 and the heater accommodating container 37, but the present invention is based on this. It is not limited. For example, an inflow path portion and an outflow path portion may be formed in the heater accommodating container 37, and the water tank 13 and the heater accommodating container 37 may be directly communicated without using the drain cock unit 34. At that time, the drain cock unit 34 may be connected to the bottom surface or the side surface of the heater housing container 37 in a state where the heater housing container 37 is attached to the bottom of the water tank 13. Three or more connection paths between the water tank 13 and the heater storage container 37 may be provided.

In the first embodiment, the first drainage port 33a is formed in a substantially elliptical shape, but the second drainage port 33b may be formed in a substantially elliptical shape, and the first drainage port 33a and The second drain port 33b may be substantially elliptical.

In the third embodiment, a connection path is constituted by the drain cock unit 134 between the water tank 113 and the heater container 137, but the present invention is not limited to this. For example, the water tank 113 and the heater container 137 may be directly communicated with each other without the drain cock unit 134 by forming a path portion communicating with the drain outlet at the bottom of the water tank 113 in the heater container 137. In that case, it is good to arrange | position a partition wall inside a channel | path part. Further, the path portion of the heater container 137 is formed in a substantially L shape, and the side surface of the heater container 137 is communicated with the bottom surface of the water tank 113, so that the low-temperature washing water in the water tank 113 is heated from the inflow path 135a to the heater. It becomes easy to flow into the container 137 bottom side. In addition, the drain cock unit 134 may be connected to the bottom surface or the side surface of the heater container 137 in a state where the heater container 137 is attached to the bottom of the water tank 113.

In the third embodiment, the configuration in which the upper end portion of the vertical portion 146a of the partition wall 146 is located above the inflow port 134a has been described. However, the present invention is not limited to this, and the vertical portion 146a The upper end may be positioned below the inflow port 134a.

In the first and third embodiments, the

lids

51 and 151 are the washing machines for the

heater accommodating containers

37 and 137 in a state where the

heater units

32 and 132 are attached to the outer bottom surfaces of the

water tanks

13 and 113. The structure provided in the back surface opening part 11a of the main body 11 was demonstrated. The lid 51 only needs to be provided in a direction in which there is an openable / closable opening of the washing machine main body 11 in the heater accommodating container 37. Therefore, the openings of the

heater storage containers

37 and 137 that are opened and closed by the

lids

51 and 151 may be formed on the front side of the washing machine body 11 or may be formed on the side surface side of the washing machine body 11.

In the first to third embodiments, a vertical washing machine has been described as an example of a washing machine. However, the present invention is not limited to this and may be a drum type washing machine. .

In addition, since said embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

As described above, the first disclosure includes a washing machine main body, a water tank supported inside the washing machine main body and having a drain outlet at the bottom, and a drain cock unit connected to the drain outlet of the water tank. The heater unit is connected to the drain cock unit and communicates with the inner bottom of the water tank, the heater is built in the heater unit and heats the washing water, and the temperature detector measures the water temperature in the heater unit. Further, the energization is stopped after the elapse of the first predetermined time from the start of energization of the heater, the water temperature in the heater unit after the elapse of the second predetermined time after the energization of the heater is detected by the temperature detection unit, and the detected water temperature Based on this, the water temperature in the aquarium is estimated.

With this configuration, it is possible to detect the water temperature in the heater storage container and the water temperature in the water tank using a single temperature detection unit, so there is no need to configure the temperature detection unit on the water tank side, and low-cost and highly reliable washing A machine can be provided.

In the second disclosure, in particular, in the first disclosure, a washing and dewatering tub that is rotatably disposed inside the water tub, and a pulsator that is rotatably disposed in a central fixed portion of the washing and dewatering tub. The pulsator is rotated at predetermined time intervals.

With this configuration, the washing water in the water tank is agitated by stirring the washing water in the water tank and the washing water in the heater storage container, and the equilibrium of the water temperature difference between the washing water in the water tank and the washing water in the heater storage container is promoted. it can.

The third disclosure includes a washing machine main body, a water tank supported inside the washing machine main body and having a drain outlet at the bottom, and a drain cock unit connected to the drain outlet of the water tank. In addition, a heater unit connected to the drain cock unit and communicating with the inner bottom of the water tank, a heater built in the heater unit for heating the washing water, a temperature detection unit for measuring the water temperature in the heater unit, and the washing in the water tank A controller that controls energization of the heater so that the water reaches a predetermined target set water temperature. The control unit estimates the water temperature in the water tank from the temperature measured by the temperature detection unit, and determines the first energization time of the heater from at least the water temperature and the amount of water supplied to the water tank. Furthermore, the control unit calculates the temperature rising rate in the water tank within the first energization time based on the temperature measured by the temperature detection unit, and from the temperature rising rate and the water temperature in the water tank after the first energizing time, The second energization time of the heater until the washing water reaches the target set water temperature is calculated.

With this configuration, it is possible to detect overheating of the heater and control the temperature of the water temperature in the water tank using a single temperature detection unit.

In the fourth disclosure, in particular, in the third disclosure, the control unit estimates the water temperature in the water tank based on the temperature measured by the temperature detection unit after a predetermined time has elapsed after the heater energization.

With this configuration, it is possible to detect the overheating of the heater and the water temperature in the water tank using a single temperature detection unit.

According to a fifth aspect of the present invention, particularly in the third or fourth disclosure, a washing and dewatering tub that is rotatably disposed in the water tank, and a pulsator that is rotatably disposed at a central fixed portion of the washing and dewatering tub. The pulsator rotates at predetermined time intervals.

With this configuration, the washing water in the aquarium and the washing water in the heater unit are agitated, so that the washing water in the aquarium is agitated, and the equilibrium of the water temperature difference between the washing water in the aquarium and the washing water in the heater container is promoted. it can.

As described above, the washing machine according to the present invention can be applied not only for home use but also for business use.

11 Washing machine body 11a Rear opening (inspection port)
DESCRIPTION OF SYMBOLS 12 Suspension 13,113 Water tank 14 Washing / dehydrating shaft 15 Washing / dehydrating tank 17 Back plate 16 Fluid balancer 18 Pulsator 20 Transmission mechanism 21 Motor 22 Motor side pulley 23 Mechanical side pulley 24 Belt 25 Upper frame body 26 Laundry loading / unloading port 27 Door 29 Operation display section 30 Water supply valve 31

Water injection case

32, 132 Heater unit 33a First drain port 33b

Second drain port

34, 134

Drain cock unit

34a, 134a Inlet 34b Drain

cock front path

34c, 134c Drain

Path side opening

36, 136

Sheet metal member

36a,

136a Separation part

37, 137

Heater receiving container

37a, 137a Drain

cock connection opening

37b, 137b

Heater insertion opening

37c, 137c Sheet metal

member insertion opening

37d, 137d

Band shape Rib

37e , 137e Rib 37g

Outflow path portion

38, 138

Heater

38a,

138a Heating portion

38b,

138b Terminal portion

38c,

138c Connection portion

38d, 138d

Flexible member

39a, 139a Inner wall

lower surface

39b, 139b Inner wall

upper surface

40, 140 Support piece 41 Drain Path 42 Spot welded portion 43 Nut 44

Bolt

51, 151 Lid 51a

Inclined rib

56, 156 Temperature detector 133 Drain port

Claims

The washing machine body,
A water tank supported inside the washing machine body and having a drain outlet at the bottom,
A drain cock unit connected to the drain port of the water tank;
A heater unit connected to the drain cock unit and communicating with the inner bottom of the water tank;
A heater built in the heater unit for heating the washing water;
A temperature detector for measuring the water temperature in the heater unit, and
The energization is stopped after the first predetermined time has elapsed from the start of energization of the heater, and the water temperature in the heater unit after the elapse of the second predetermined time after the energization of the heater is detected by the temperature detection unit. A washing machine that estimates the water temperature in the water tank based on the water temperature.
A washing and dewatering tank disposed rotatably inside the water tank;
A pulsator rotatably disposed at the center inner bottom of the washing and dewatering tub,
The washing machine according to claim 1, wherein the pulsator rotates at predetermined time intervals to agitate the washing water in the water tank and the washing water in the heater unit.
The washing machine body,
A water tank supported inside the washing machine body and having a drain outlet at the bottom,
A drain cock unit connected to the drain port of the water tank;
A heater unit connected to the drain cock unit and communicating with the inner bottom of the water tank;
A heater built in the heater unit for heating the washing water;
A temperature detector for measuring the water temperature in the heater unit;
A controller that controls energization of the heater so that the wash water in the water tank reaches a predetermined target set water temperature,
The controller estimates the water temperature in the water tank from the temperature measured by the temperature detector,
A first energization time of the heater is determined based on at least the temperature and amount of water supplied to the water tank, and the temperature rise rate in the water tank within the first energization time is measured by the temperature detector. And the second energization time of the heater until the wash water in the water tank reaches the target set water temperature from the temperature increase rate and the water temperature in the water tank after the first energization time. Calculate the washing machine.
The washing machine according to claim 3, wherein the control unit estimates a water temperature in the water tank based on a temperature measured by the temperature detection unit after a predetermined time has elapsed after the energization of the heater.
A washing and dewatering tank disposed rotatably inside the water tank;
A pulsator rotatably disposed at a central fixed portion of the washing and dewatering tub,
The washing machine according to any one of claims 3 and 4, wherein the pulsator rotates at a predetermined time interval to agitate the washing water in the water tank and the washing water in the heater unit.