AUTOMATIC WATER SUPPLY DEVICE, REFRIGERATOR WITH IT

Description

TECHNICAL FIELD

[0001] The present invention relates to the field of automatic water supply devices and a refrigerator having the same and an automatic water supply device.BACKGROUND

[0002] At present, many refrigerators may provide refrigerated drinking water. Generally, there are two water supply manners: one is providing a dispenser on a surface of the refrigerator so that the user may use a cup to receive water from the dispenser; the other is filling water into a water vessel, then placing the water vessel into the refrigerator, and then taking the water vessel out of the refrigerator after a period of time to drink cold water. In the second solution, to facilitate the user to take a sufficient amount of cold water at any time, some auto-filling devices are available from the market, a set of Hall switch and magnet are used to detect whether the water vessel is placed on a bracket, and then another set of Hall switch and a float with an built-in magnet are used to detect whether a liquid level in the water vessel is low, and water is automatically filled when the water vessel is placed on the bracket and the liquid level is low.

[0003] However, generally the float may be removed out of the water vessel; if the user forgets to place the float back into the water vessel after cleaning the water vessel, the Hall switch cannot detect the magnet so that the water is always automatically filled until water overflows out of the water vessel. Hence, this detection manner has a potential water-overflow hazard and brings a lot of trouble to users.

[0004] US20170137277A1 disclosed a refrigerator with automatic liquid dispenser according to the preamble of claim 1. The liquid dispenser is arranged on the interior surface of the door, and a container is supported on the door and configured to receive liquid from the liquid dispenser. A sensor is configured to sense a property of the container, and a control is in communication with the sensor. The control is configured to regulate dispensing of liquid into the container based upon the sensed property of the container.SUMMARY

[0005] An object of the present invention is to provide an automatic water supply device, a refrigerator having the same.

[0006] The invention is defined by the appended set of claims.

[0007] As compared with the prior art, in the automatic water supply device according to the present invention, the controller will control the water valve to open only when the first sensor detects that the inductive element is at a lower first height. If the user forgets to put the inductive element into the water vessel after cleaning the water vessel, the controller will keep the water valve closed, so that water will not be automatically filled into the water vessel, thereby avoiding the problem of water overflow out of the water vessel caused by continued water filling because the sensor fails to detect the inductive element.BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a structure schematic view of a door body of a refrigerator according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of an automatic water supply device according to an embodiment of the present invention; FIG. 3 is an enlarged view of portion A in FIG. 2; FIG. 4 is a cross-sectional view of an automatic water supply device according to an embodiment of the present invention; FIG. 5 is an enlarged view of portion B in FIG. 4; FIG. 6 is a structural schematic view of a water vessel in an embodiment of the present invention; FIG. 7 is a cross-sectional view of a water vessel in an embodiment of the present invention; FIG. 8 is a flow chart of an automatic water supply method not forming part of the present invention; FIG. 9 is a flow chart of an automatic water supply method not forming part of the present invention; FIG. 10 is a flow chart of an automatic water supply method not forming part of the present invention. DETAILED DESCRIPTION

[0009] Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings.Each example is provided by way of explanation of the invention, not limitation of the invention.In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the invention.For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims.

[0010] As shown in FIG. 1, an embodiment of the present invention discloses a refrigerator. The refrigerator comprises a cabinet and a door body 1 for opening and closing the cabinet, an automatic water supply device being provided on an inner side of the door body 1. As shown in FIGS. 2-7, the automatic water supply device comprises a water vessel 100, a bracket 200 for placing the water vessel 100, a detection means 300, and a water supply mechanism 400 for supplying water to the water vessel 100. The cabinet may define a refrigerating chamber. When the door body 1 closes the cabinet, the cold air in the refrigerating chamber may cool the water in the water vessel 100.

[0011] Certainly, sites where the automatic water supply device is used are not limited to refrigerators, and may be various sites such as other refrigeration appliances or cafes. In embodiments of the present invention, water is a collective term of liquid beverages, and includes but not limited to liquid beverages such as purified water, fruit juice, milk or coffee.

[0012] As shown in FIGS. 3-7, the water vessel 100 comprises a water filling port 110. The detection means 300 comprises an inductive element 321 and a first sensor 322 disposed on the bracket 200. The inductive element 321 is disposed in the water vessel 100 and capable of rising or falling along with the liquid level. The first sensor 322 outputs a first detection signal upon detecting that the inductive element 321 is located at a first height. The water supply mechanism 400 comprises a water supply pipe 410 and a water valve provided on the water supply pipe 410. An outlet of the water supply pipe 410 corresponds to the water filling port 110 of the water vessel 100. The automatic water supply device further comprises a controller controlling the water valve to open upon receiving the first detection signal. The detection means further includes a detection element capable of outputting a second detection signal characterizing the liquid level in the water vessel, and the controller controls the water valve to close upon receiving the second detection signal.

[0013] In the automatic water supply device disclosed in the present invention, the controller will control the water valve to open only when the first sensor 322 detects that the inductive element 321 is located at a low first height. If the user forgets to put the inductive element into the water vessel after cleaning the water vessel, the controller will always control the water valve to close, so that it will not automatically fill the water vessel with water. This avoids the problem of water overflow from the water vessel because the sensor cannot detect the inductive element and water is filled constantly.

[0014] Specifically, in the embodiment of the present invention, the detection element is a second sensor 323 provided on the bracket 200, the second sensor 323 outputs the second detection signal upon detecting that the inductive element 321 is located at the second height, and the second height is greater than the first height. The second sensor 210 is used to determine the timing for stopping water filling after the water filling starts.

[0015] Specifically, the first height is closer to the bottom of the water vessel 100 than the second height, that is, the inductive element 321 is at the lowest point in the water vessel 100. It may be believed that when the inductive element 321 is at the first height, there is little or no water in the water vessel 100, whereupon the water valve needs to be opened to fill water; the second height is a height closer to the top of the water vessel 100. It may be appreciated that when the inductive element 321 is at the second height, the water vessel 100 contains a large amount of water or is in a full state, whereupon the water valve needs to be closed to stop the water filling. When the liquid level in the water vessel 100 is lower than the first height, the liquid level in the water vessel 100 must be lower than or equal to the first height, and the first sensor 322 will detect the inductive element and output the first detection signal, and the controller will control the water valve to open to fill the water vessel 100 with water. During the water filling process, the inductive element 321 will move upward with the liquid level, and when it reaches the second height, the liquid level in the water vessel 100 also reaches the second height. At this time, the second sensor 323 will detect the inductive element 321 and output the second detection signal, the controller will control the water valve to close, thereby completing the process of automatic water filling.

[0016] Specifically, the water supply pipe 410 may be externally connected to the user's water source, and extends along the cabinet of the refrigerator into the door body 1. When the water valve is opened, the external water source may fill the water vessel 100 with water through the water supply pipe 410. Specifically, in the embodiment of the present invention, the water supply pipe extends from a compressor compartment at a lower part of the cabinet along the cabinet into the inner side of the door body, and the water valve may be provided on the water supply pipe in the compressor compartment. Certainly, in other embodiments, the water valve may also be disposed on other parts of the water supply pipe.

[0017] As shown in FIG. 3, in the embodiment of the present invention, a float box 131 is provided in the water vessel, the inductive element 321 is fixedly disposed in the float box 131, and the float box 131 rises and falls as the liquid level changes. The float box 131 seals the inductive element 321 inside to ensure that it may float up and down.

[0018] Specifically, a side wall of the water vessel 100 is provided with a rail 132 extending in the height direction, the float box 131 is located in the rail 132, and the rail 132 is provided with a water hole 1323 through which water flows. Specifically, along the height direction of the water vessel 100, an inner side wall of the water vessel 100 is provided with the rail 132. The rail includes a housing 1321 protruding into the interior of the water vessel and an internal channel 1322 surrounded by the housing 1321. The float box 131 is provided in the internal channel 1322, and the water hole 1323 communicated with the internal channel 1322 is provided in the lengthwise direction of the side wall of the housing 1321, so that the liquid in the water vessel 100 may flow into the internal channel 1322. The size of the internal channel 1322 is adapted to the size of the float box 131 so that the float box 131 can only move in the vertical direction with the liquid level. In addition, the bottom wall of the housing 1321 is also provided with a water hole to facilitate the liquid to enter the internal channel 1322. The top of the housing 1321 is provided with an opening 1324 and a seal 1325 for sealing the opening 1324. When the user cleans the water vessel, the seal 1325 may be taken out, and the float box 131 may also be taken out for cleaning.

[0019] In another example not forming part of this invention, an inner box fixedly connected to the water vessel lid and extending downward from the lid may also be provided, and the float box is disposed inside the inner box so that the liquid in the water vessel may flow into the interior of the inner box such that the float may float up and down with the liquid level.

[0020] In the embodiment of the present invention, as shown in FIGS. 4-5, the first sensor 322 and the second sensor 323 are both a Hall switch, and the inductive element 321 is a magnet. The two Hall switches are disposed on the bracket 200 in the height direction, and may respectively detect the approach of the magnet. Specifically, the Hall switch is an active electromagnetic conversion device fabricated by an integrated packaging and assembling process based on the principle of the Hall effect. The Hall switch may induce a magnitude of the magnetic flux. When the magnetic flux reaches a preset value, a trigger in the Hall switch flips, and an output level state of the Hall switch is also inverted accordingly, so that the magnetic input signal may be converted into an electrical signal. The magnet in the float box will move up and down along with the liquid level, and the magnetic flux detected by the Hall switch will also change accordingly.

[0021] The first sensor 322 is disposed on the bracket 200 at a position corresponding to the first height, and the second sensor 323 is disposed on the bracket 200 at a position corresponding to the second height. After the water vessel 100 is placed on the bracket 200, if the user forgets to put the float box 131 back into the water vessel 100, the first sensor 322 can never detect the inductive element 321, and the water valve will remain closed and water will not be automatically filled into the water vessel 100 regardless of whether there is water in the water vessel 100. If the water vessel 100 is placed on the bracket 200 and the float box 131 is in the water vessel 100, the height of the inductive element 321 varies with the liquid level. If the liquid level in the water vessel 100 is equal to or lower than the first height, the inductive element 321 is located at the first height. At this time, the inductive element 321 is the closest to the first sensor 322, the magnetic flux sensed by the first sensor 322 reaches a preset value, the trigger inside the first sensor 322 flips to cause the output level state of the first sensor 322 to switch (the Hall switch switches an ON state to an OFF state), and the controller receives the first detection signal and opens the water valve to automatically fill water into the water vessel 100. During the water filling process, the liquid level will rise to drive the float box 131 to move upward, and the inductive element 321, namely, the magnet, will also approach the second sensor 323 until the liquid level in the water vessel 100 reaches the second height. At this time, the magnetic flux sensed by the second sensor 323 also reaches the preset value, the trigger inside the second sensor 323 flips to cause the output level state of the second sensor 323 to switch (the Hall switch switches from the OFF state to the ON state), and the controller will receive the second detection signal and close the water valve to stop the automatic water filling. In this way, the position of the magnet is detected and the liquid level in the water vessel is judged through the two Hall switches, respectively, and the controller controls the water valve to open or close according to different detection signals sent by different Hall switches, to automatically fill water into the water vessel if necessary. Furthermore, setting the water valve to be opened only when the first detection signal indicating that the inductive element is at the first height is received can ensure that the inductive element 321 is already inside the water vessel 100 at this time, and the problem of water overflow will not occur.

[0022] Similarly, the detection means 320 may also detect whether the water vessel 100 is placed on the bracket 200. When the controller receives the first detection signal, it may be determined that the water vessel 100 is already placed on the bracket 200 at this time, and the liquid level is low and water needs to be automatically filled.

[0023] In other embodiments, the second sensor may also be other sensors such as a photoelectric sensor, a capacitive liquid level sensor, etc., which is not limited in the present invention. A sensor such as a photoelectric sensor or a capacitive liquid level sensor may directly detect the liquid level in the water vessel. When the real-time liquid level reaches a preset liquid level, it will trigger the aforementioned sensor to output a detection signal to the controller to cause the controller to close the water valve.

[0024] In another embodiment, the detection element may also be a timer, and the first sensor may be a Hall switch. During the water filling process, the inductive element will gradually move upwards with the liquid level, and the magnetic flux sensed by the first sensor will be less than the preset value at a certain liquid level, the output level state of the first sensor will switch again (the Hall switch switches from the ON state to the OFF state), and the controller will receive an OFF signal output by the first sensor and control the timer to start timing. When the water filling time reaches a preset time (which may be 15s, 30s, or the like), the controller may control to close the water valve. Thus, the second sensor may be omitted, and only the first sensor may be used to cooperate with the inductive element and the timer to control the opening and closing of the water valve and the automatic water filling process. Specifically, the preset time may be calculated in advance according to the height of the first sensor, the speed of automatic water filling and the volume of the water vessel.

[0025] As shown in FIGS. 6-7, the water vessel 100 further comprises a water vessel lid 120, a water vessel body 130, and a water storage space defined by the water vessel lid 120 and the water vessel body 130. The water filling port 110 is disposed on the water vessel lid 120. The water vessel 100 further comprises a water filling cup 140 extending from the water filling port 110 to the bottom of the water vessel 100. A plurality of water outlets 141 communicated with the water storage space are provided on a peripheral wall of the water filling cup 140. The water filling cup 140 may slow down the flow rate of the water upon water filling, reduce the noise upon water filling, and prevent the water flow from splashing around.

[0026] Preferably, the water filling cup 140 comprises an upwardly-protruding bottom wall 142, and the water outlets 141 extend from top to bottom on the peripheral wall to a position connected to the bottom wall 142. Specifically, a plurality of elongated water outlets 141 are provided at an interval on the peripheral wall of the water filling cup 140, and the water outlets 141 extend on the peripheral wall of the water filling cup 140 so that water can flow into the water storage space quickly without gathering in the water filling cup 140. The upward protrusion of the bottom wall 142 may further prevent the water in the water filling cup 140 from gathering and enable the water to flow out through the water outlets 141.

[0027] A water spout 131 is disposed on the water vessel body 130, a water baffle 150 is provided at a position adjacent to the water spout 131 in the water storage space, and a water passageway 151 communicated with the water spout 131 is formed between the water baffle 150 and the inner wall of the water vessel 100. When the user takes water, he may pour out water through the water spout 131. The water baffle 150 is provided to prevent the water from flowing rapidly and splashing out of the water vessel 100 when the user pours water.

[0028] Preferably, the water baffle 150 is preferably arc-shaped. Furthermore, the arc top of the water baffle 150 protrudes toward the side wall of the water vessel 100 opposite to the water spout 131. The arc-shaped water baffle 150 has a good water blocking effect, and its arc top protrudes toward the side wall of the water vessel 100 opposite to the water spout 131, so that an effective water passageway is formed between the water baffle 150 and the side wall of the water vessel 100, and further enhances the splash-preventing effect.

[0029] In the embodiment of the present invention, the water baffle 150 extends from the water vessel lid 120 to the bottom of the water vessel 100, and the water passageway 151 is formed on both sides and the bottom of the water baffle 150. The water baffle 150 extending to the bottom of the water vessel 100 may guide water into the water passageway from a lower position of the water vessel 100, thereby further reducing the flow rate of water when poured.

[0030] As shown in FIG. 1, the door 1 is provided with a bottle seat 3, and the bracket 200 is additionally disposed on the bottle seat 3. The bracket 200 is pre-assembled with the bottle seat 3 through a connecting piece. The connecting piece may be specifically a hook structure to facilitate mounting the bracket 200 to or demounting the bracket 200 from the bottle seat 3. When the user does not need to use the water vessel, he may remove the water vessel 100 and the bracket 200, and the original position where the bracket is placed may continue to serve as the bottle seat. The outlet of the water supply pipe 410 is fixed at an upper half of the bracket 100 to align with the water filling port 110 on the water vessel lid 120 of the water vessel 100. The water vessel 100 is located below the bottle seat 3 and on a side close to the door handle. The water vessel 100 may be drawn out transversely along the width direction of the door body, so it occupies a small space in the refrigerator without affecting the storage space of the shelves in the refrigerating compartment.

[0031] As shown in FIGS. 8-10, another example not forming part of the present invention discloses an automatic water supply method for supplying water to a water vessel disposed on a refrigerator door, the method comprising: S100: detecting a real-time height of the inductive element 321 provided in the water vessel 100.

[0032] The inductive element 321 is mounted in the float box 131 and may move up and down with the liquid level. Specifically, the first sensor 322 disposed on the bracket is used to detect the real-time height of the inductive element. The first sensor 322 is a Hall switch, and the inductive element 321 is a magnet.

[0033] S200: outputting a first detection signal when the inductive element 321 is located at a first height.

[0034] When the inductive element 321 is located at the first height and closest to the first sensor 322, the magnetic flux sensed by the first sensor 322 reaches a preset value and makes a trigger in the first sensor 322 flip so that the first sensor 322 outputs the first detection signal to the controller.

[0035] S300: the controller opens the water valve upon receiving the first detection signal.

[0036] When the controller receives the first detection signal, this means that the liquid level in the water vessel 100 is low at this time and water needs to be filled, and then the controller will open the water valve.

[0037] S400: the controller closes the water valve upon receiving a second detection signal.

[0038] The second detection signal is a signal output by the second sensor 323 provided on the bracket 200. The second sensor 323 may detect the liquid level in the water vessel 100. When the liquid level reaches the preset liquid level, the water in the water vessel is already enough and the water filling may be stopped. Therefore, the second sensor 323 outputs a second detection signal, and the controller closes the water valve upon receiving the second detection signal.

[0039] Further, as shown in FIG. 9, after step S300, the method further comprises:

[0040] S310: When the inductive element 321 is located at a second height, output the second detection signal, the second height being greater than the first height.

[0041] The second sensor 323 is a Hall switch, and its height is higher than that of the first sensor 322. Therefore, when the inductive element 321 is close to the second sensor 323, the magnetic flux sensed by the second sensor 323 reaches the preset value and makes the trigger inside the second sensor 323 flip, so that the second sensor 323 outputs the second detection signal to the controller.

[0042] Further, the method further comprises: S500: the controller closes the water valve upon receiving a water overflow signal or a refrigerator door opening signal.

[0043] The automatic water supply device is further provided with an overflow detection means and a refrigerator door opening and closing detection means. The overflow detection means is configured to detect whether the water in the water vessel overflows. The refrigerator door opening and closing means is configured to detect whether the refrigerator door is in an open state or a closed state. Specifically, if the controller receives the overflow signal, it means that the water in the water vessel is already full, so the controller needs to close the water valve. If the controller receives the refrigerator door opening signal, the user might take out the water vessel, whereupon water filling needn't be continued, so the controller also needs to close the water valve.

[0044] Further, as shown in FIG. 10, after the step S300, the method further comprises: S320: A timer records an opening time period of the water valve.

[0045] After the controller opens the water valve, the timer will start to record the opening time period of the water valve.

[0046] S321: When the opening time period exceeds a preset time period, the timer outputs a timeout signal.

[0047] Generally speaking, the flow rate of filled water is constant. An amount of the filled water may be calculated by multiplying the flow rate by a water filing time period. In order to prevent the failure of the detection means and the overflow detection means, the automatic water supply device is further provided with water filling timeout protection. When the water filling time period exceeds a preset time period, overflow phenomenon might occur, and the timer will output a timeout signal to the controller. Specifically, a specific value of the preset time period may be designed based on parameters such as the flow rate of filled water, the volume of the water vessel, and the like. In the embodiment of the present invention, the preset time period may be set to 150 seconds.

[0048] S322: the controller closes the water valve upon receiving the timeout signal.

[0049] When the controller receives the timeout signal which indicates that water overflow might occur, the controller will close the water valve to avoid excessive water overflow.

[0050] Accordingly, the controller will control the water valve to open only when the first sensor detects that the inductive element is at a lower first height. If the user forgets to put the inductive element into the water vessel after cleaning the water vessel, the controller will keep the water valve closed, so that water will not be automatically filled into the water vessel, thereby avoiding the problem of water overflow out of the water vessel caused by continued water filling because the sensor fails to detect the inductive element. Two Hall switches and a magnet are used to detect the liquid level in the water vessel, so that the structure is simple and the detection accuracy is high. With the rail disposed on the inner wall of the water vessel and the float box being disposed in the rail, the magnet may be enabled to move up and down with the liquid level, and output different detection signals by approaching different Hall switches. The controller may control the opening and closing of the water valve according to the received different detection signals. The water filling cup disposed in the water vessel may slow down the flow rate of the water upon water filling, reduce the noise upon water filling, and prevent the water flow from splashing around. The upward protrusion of the bottom wall of the water filling cup may further prevent the water in the water filling cup from gathering and enable the water to flow out through the water outlets. The water baffle may be provided to prevent the water from flowing rapidly and splashing out of the water vessel when the user pours water.

Claims

1. An automatic water supply device for a refrigerator, wherein the device comprises a water vessel (100), a bracket (200) for placing the water vessel (100), a detection means (300), and a water supply mechanism (400) for supplying water to the water vessel (100), the water vessel (100) comprising a water filling port (110); the detection means (300) comprises an inductive element (321) and a first sensor (322) disposed on the bracket (200), the inductive element (321) is disposed in the water vessel (100) and capable of rising or falling along with the liquid level, and the first sensor (322) outputs a first detection signal upon detecting that the inductive element (321) is located at a first height; the water supply mechanism (400) comprises a water supply pipe (410) and a water valve provided on the water supply pipe (410), and an outlet of the water supply pipe (410) corresponds to the water filling port (110) of the water vessel (100); the automatic water supply device further comprises a controller controlling the water valve to open upon receiving the first detection signal; the detection means (300) further comprises a detection element capable of outputting a second detection signal characterizing the liquid level in the water vessel (100), and the controller controls the water valve to close upon receiving the second detection signal; a float box (131) is provided in the water vessel (100), the inductive element (321) is fixedly disposed in the float box (131), and the float box (131) rises and falls as the liquid level changes; wherein a side wall of the water vessel (100) is provided with a rail (132) extending in a height direction, the float box (131) is located in the rail (132), and the rail (132) is provided with a water hole (1323), characterized in that the rail (132) includes a housing (1321) protruding into the interior of the water vessel (100) and an internal channel (1322) surrounded by the housing (1321), the water hole (1323) communicated with the internal channel (1322) is provided in the lengthwise direction of the side wall of the housing (1321), the top of the housing (1321) is provided with an opening (1324) and a seal (1325) for sealing the opening (1324).

2. The automatic water supply device according to claim 1, wherein the detection element is a second sensor (323) provided on the bracket (200), the second sensor (323) outputs the second detection signal upon detecting that the inductive element (321) is located at a second height, and the second height is greater than the first height.

3. The automatic water supply device according to claim 2, wherein the first sensor (322) and the second sensor (323) are both a Hall switch, and the inductive element (321) is a magnet.

4. The automatic water supply device according to claim 1, wherein the water vessel (100) further comprises a water vessel lid (120), a water vessel body (130), and a water storage space defined by the water vessel lid (120) and the water vessel body (130), and the water filling port (110) is disposed on the water vessel lid (120); the water vessel (100) further comprises a water filling cup (140) extending from the water filling port (110) to the bottom of the water vessel (100), and a plurality of water outlets (141) communicated with the water storage space are provided on a peripheral wall of the water filling cup (140).

5. The automatic water supply device according to claim 4, wherein the water filling cup (140) comprises an upwardly-protruding bottom wall (142), and the water outlets (141) extend from top to bottom on the peripheral wall to a position connected to the bottom wall (142).

6. The automatic water supply device according to claim 1, wherein the water vessel (100) further comprises a water vessel lid (120), a water vessel body (130), and a water storage space defined by the water vessel lid (120) and the water vessel body (130), a water spout (131) is disposed on the water vessel body (130), a water baffle (150) is provided at a position adjacent to the water spout (131) in the water storage space, and a water passageway (151) communicated with the water spout (131) is formed between the water baffle (150) and the inner wall of the water vessel (100).

7. The automatic water supply device according to claim 6, wherein the water baffle (150) is arc-shaped.

8. The automatic water supply device according to claim 7, wherein the water baffle (150) extends from the water vessel lid (120) to the bottom of the water vessel (100), and the water passageway (151) is formed on both sides and the bottom of the water baffle (150).

9. A refrigerator, wherein the refrigerator comprises a cabinet and a door body (1) for opening and closing the cabinet, the water supply device according to any of claims 1-8 being disposed on an inner side of the door body (1).