Hinge assembly and household appliance

Abstract

The present application relates to a hinge assembly and a household appliance. The hinge assembly includes a first hinge, and the first hinge includes a first housing, a first door shaft portion and an acting portion. The first housing is configured to be connected to a box body. The first door shaft portion has a central axis and is rotatably connected to the first housing around the central axis. The first door shaft portion is configured to be fixedly connected to a door body and rotate relative to the first housing following the door body when the door body opens and closes an opening of the box body. The acting portion is disposed in the first housing and is in transmission connection with the first door shaft portion. The acting portion is configured to provide a resistance force that hinders the first door shaft portion from following the door body to open the opening of the box body. It can effectively avoid the risk of collision between the door body and obstacles caused by the user's large-angle opening of the door due to inertia.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and particularly to a hinge assembly and a household appliance. Background Art

[0002] Generally, for household appliances such as refrigerators, during the opening process of the door body, the door body rotates around the hinge axis. When the refrigerator is placed in a large space, the opening and closing angle of the door body can be freely operated by the user. If the refrigerator is placed in a corner or embedded or there are temporary items obstructing the door opening around the refrigerator, when the user opens the refrigerator door body, it is easy to open the door body at a large angle due to inertia, causing the door body to hit obstacles such as the side wall, cabinet body, or temporary items, resulting in the door body being knocked and damaged. Summary of the Invention

[0003] In view of the problem that the existing door body is prone to collide with surrounding obstacles when opened, the present application provides a hinge assembly and a household appliance, which have the technical effect of preventing the user from opening the door at a large angle and colliding with obstacles.

[0004] A hinge assembly for connecting a door body and a cabinet body, the door body being disposed at an opening of the cabinet body, the door body opening and closing the opening under an external force, characterized in that the hinge assembly includes a first hinge, and the first hinge includes:

[0005] A first housing configured to be connected to the cabinet body;

[0006] A first door shaft portion having a central axis and rotatably connected to the first housing around the central axis, the first door shaft portion being configured to be fixedly connected to the door body and rotating relative to the first housing following the door body when the door body opens and closes the opening; and

[0007] An acting portion disposed in the first housing and drivingly connected to the first door shaft portion, the acting portion being configured to provide a resistance force that impedes the first door shaft portion from following the door body to open the opening.

[0008] In one embodiment, the acting portion includes a pre-tightening member and a transmission member, the pre-tightening member connecting the transmission member, the transmission member being rotatably disposed in the first housing around a direction parallel to the central axis, and the transmission member drivingly connecting the first door shaft portion;

[0009] During the process that the first door shaft portion follows the door body to open the opening, the first door shaft portion drives the transmission member to rotate, and the pre-tightening member is configured to provide a resistance force that slows down the rotation speed of the transmission member.

[0010] In one embodiment, the pre-tightening member includes a clock spring, the clock spring is curled in a first direction parallel to the central axis, and two ends of the clock spring in its curling direction are respectively a first end and a second end. The first end is configured to be fixedly connected to the transmission member, and the second end is connected to the first housing;

[0011] During the process that the first door shaft part follows the door body to open the opening, the first end rotates along with the transmission member to cause the clock spring to tighten and generate the resistance force.

[0012] In one embodiment, the pre-tightening member further includes a clock spring mounting seat, the clock spring is sleeved outside the clock spring mounting seat, the clock spring mounting seat has a first mounting hole arranged along the first direction, and the transmission member is fixedly connected to the mounting hole;

[0013] The first end is connected to the clock spring mounting seat, and the second end is connected to the first housing.

[0014] In one embodiment, the transmission member includes a pre-tightening wheel, the pre-tightening wheel is in transmission connection with the first door shaft part, and one end of the pre-tightening wheel is coaxially inserted into the first mounting hole;

[0015] During the process that the first door shaft part follows the door body to open the opening, it drives the pre-tightening wheel to rotate, and the first end rotates along with the pre-tightening wheel to cause the clock spring to tighten and generate the resistance force.

[0016] In one embodiment, it further includes a second hinge, and the second hinge is used to connect the box body and the door body and support the door body to rotate relative to the box body;

[0017] The first hinge is arranged at one end of the door body in the direction of the central axis, and the second hinge is arranged at the other end of the door body in the direction of the central axis.

[0018] In one embodiment, the first door shaft part is configured to be controlled to rotate around the central axis between a first angle, a second angle and a third angle that increase in sequence, and be controlled to move between a transmission position and a free position in a second direction perpendicular to the central axis;

[0019] When the first door shaft part rotates between the first angle and the second angle, the first door shaft part is located at the transmission position and is in transmission connection with the acting part. When the first door shaft part rotates between the second angle and the third angle, the first door shaft part is located at the free position and is disconnected from the acting part;

[0020] Correspondingly, the second hinge is configured to allow the door body to move along itself in the second direction.

[0021] In one embodiment, the first door shaft portion includes a door shaft wheel and a first door shaft that are coaxially mated along the central axis. The first door shaft is configured to be fixedly connected to the door body and is rotatably connected to the first housing. The door shaft wheel is rotatably disposed in the first housing and is in transmission connection with the acting portion.

[0022] When an external force acts on the door body to move in the second direction, the door shaft wheel is driven by the first door shaft to move between the transmission position and the free position.

[0023] In one embodiment, the first housing has a strip-shaped hole extending along the central axis. The length direction of the strip-shaped hole corresponds to the second direction. The door shaft wheel is rotatably and movably disposed in the strip-shaped hole.

[0024] The transmission position and the free position correspond to the two ends of the strip-shaped hole in its own length direction.

[0025] In one embodiment, the first housing further has a limiting groove, which is arranged around the outer periphery of the strip-shaped hole. The limiting groove includes a first arc segment, a straight segment, and a second arc segment that are connected in sequence.

[0026] The door shaft wheel has a limiting portion, and the limiting portion is movably arranged along the limiting groove. When the door shaft wheel is in the transmission position, the limiting portion is located in the first arc segment. When the door shaft wheel moves between the transmission position and the free position, the limiting portion moves along the straight segment. When the door shaft wheel is in the free position, the limiting portion is located in the second arc segment.

[0027] In one embodiment, the second hinge includes a second housing and a second door shaft portion. The second housing is configured in the box body, and the second door shaft portion is configured to be fixedly connected to the door body. The second door shaft portion is coaxially arranged with the first door shaft portion.

[0028] The second housing has a second sliding groove arranged along the second direction. The second door shaft portion is movably and rotatably arranged in the second sliding groove around the central axis.

[0029] The two ends of the second sliding groove in its own extending direction are respectively a first mating end and a second mating end. When the second door shaft portion is located at the first mating end, the door shaft wheel is in the transmission position. When the second door shaft portion is located at the second mating end, the door shaft wheel is in the free position.

[0030] In one embodiment, the second slide groove further has a transition section connecting the first mating end and the second mating end, and the projection position of the support surface of the transition section on the central axis is closer to the first shell than the projection positions of the support surface of the first mating end and the support surface of the second mating end on the central axis, and the projections of the support surface of the first mating end and the support surface of the second mating end on the central axis coincide with each other;

[0031] Correspondingly, the first door axis is constructed to have an initial position and a lifting position in the direction of the central axis, and the initial position is arranged closer to the second shell body than the lifting position; when the second door axis portion is controlled to move from the first mating end to the transition section, the first door axis is controlled to advance from the initial position to the lifting position; when the second door axis portion is controlled to move from the transition section to the second mating end, the first door axis is controlled to retreat from the lifting position to the initial position;

[0032] The portal axle wheel follows the movement of the first portal axle at least when in the transmission position and when moving between the transmission position and the free position.

[0033] In one embodiment, the first housing comprises a first shell body, a first fixing block and a first mounting ring, the action portion is arranged in the first shell body, the first fixing block is arranged outside the first shell body and has a mounting cavity, the first mounting ring is arranged in the mounting cavity along the central axis, and the first door shaft is rotatably arranged in the first mounting ring;

[0034] The first door shaft is rotatably and movably arranged on the first mounting ring along the direction of the central axis, and the first door shaft switches between a first rotation position and a second rotation position on the first mounting ring when the first mounting ring moves, and the second rotation position is arranged closer to the second shell than the first rotation position;

[0035] The cavity wall of the installation cavity is provided with a first track, the first track includes an inclined segment and a straight segment connected at an obtuse angle, the straight segment extends longitudinally along the second direction, and an end of the inclined segment away from the straight segment is arranged farther away from the first shell body than the straight segment; the outer wall of the first installation ring has a first matching portion slidably connected to the first track;

[0036] When the door axle wheel is located at the transmission position, the first matching portion is located at the end of the inclined section opposite to the straight section, and the first door axle is located at the first rotation position; when the door axle wheel is located at the free position, the first matching portion is located at the end of the straight section opposite to the inclined section, and the first door axle is located at the second rotation position.

[0037] In one embodiment, the first door shaft has a first protrusion protruding towards the inner wall of the first mounting ring. The inner wall of the first mounting ring has a first sliding groove arranged around the central axis. The first sliding groove has two adjacent and identical sub-sliding grooves in the direction of the central axis. The first protrusion can slide along each sub-sliding groove, and the two sub-sliding grooves respectively correspond to the first rotation position and the second rotation position;

[0038] In the projection range on the plane perpendicular to the central axis, the projection range of the sub-sliding groove corresponding to the second rotation position is smaller than and located within the projection range of the sub-sliding groove corresponding to the first rotation position.

[0039] In one embodiment, the first door shaft and the door shaft wheel are configured to be selectively inserted in the direction of the central axis;

[0040] The first housing further includes a second mounting ring. The second mounting ring is coaxially arranged with the first mounting ring in the mounting cavity. The mounting cavity further has a second track arranged parallel to the first track. The second track is arranged closer to the first housing than the first track. The second mounting ring is slidably arranged along the second track;

[0041] The door shaft wheel is only rotatably arranged on the second mounting ring.

[0042] In one embodiment, the second door shaft portion includes a second door shaft, a frustum of a cone, and a protrusion. The large-diameter end of the frustum of the cone is coaxially connected to one axial end of the second door shaft. The protrusion protrudes in the direction of the central axis from the small-diameter end of the frustum of the cone and is eccentrically arranged with respect to the small-diameter end of the frustum of the cone;

[0043] Both the first mating end and the second mating end have a transition surface that mates with the conical surface of the frustum of the cone, a contact surface that mates with the small-diameter end of the frustum of the cone, an avoidance space for the protrusion to move, and a transition slope for the protrusion to transition between the avoidance space and the contact surface;

[0044] The transition section transitions between the transition surface of the first mating end and the transition surface of the second mating end. The transition slope, the transition surface, the contact surface, and the avoidance space are arranged in sequence in the direction of the central axis.

[0045] In one embodiment, the second door shaft portion further includes a first limiting ring and a second limiting ring. The first limiting ring and the second limiting ring are coaxially sleeved on the second door shaft, and there is a receiving groove between the first limiting ring and the second limiting ring;

[0046] The second shell also has a third slide groove, the inner wall of the third slide groove has an inner guide rail, the second door axis is rotatably arranged in the third slide groove, the end of the third slide groove away from the second slide groove is limited to the accommodating groove and can move along the accommodating groove in the direction of the central axis, the first limiting ring is located outside the third slide groove, the second limiting ring is located in the third slide groove, and the second limiting ring is supported by the inner guide rail.

[0047] In one embodiment, the second shell includes a second shell body, a second fixing block and a base, and the second shell body is configured on the box body;

[0048] The second shell body has a mounting groove, the second fixing block and the base are coaxially mounted in the mounting groove, the base has the second sliding groove, and the second fixing block has the third sliding groove.

[0049] In one embodiment, the second hinge further comprises a door closing member, one side of the door closing member has a mounting shaft, the mounting shaft has an axis hole, the axis hole is matched with the second door axis portion, and the mounting shaft is configured to be fixedly connected to the door body;

[0050] The second shell is provided with a hanging ear and a blocking piece corresponding to the first angle and the second angle respectively, and the door closing member is provided with a hook and a blocking block; when the door body is at the first angle, the hook is hooked with the hanging ear, and when the door body is at the second angle, the blocking block is abutted with the blocking piece;

[0051] During the process of the second door axis portion moving from the first mating end to the second mating end, the stopper is separated from the stopper sheet.

[0052] In one of the embodiments, the first shell has a transition portion, the transition portion extends in a direction parallel to the central axis, and the transition portion is configured to be rotatably connected to the box body.

[0053] In one embodiment of the present application, a household appliance is also provided, comprising a housing, a door body and the hinge assembly described in any one of the above embodiments, wherein the door body is arranged at the opening of the housing, the hinge assembly connects the door body and the housing, and the door body opens and closes the opening under the action of external force.

[0054] In one embodiment, the first door shaft portion includes a first door shaft, the first door shaft is rotatably disposed on the first shell, and movably connects the first shell and the door body along the central axis;

[0055] The household appliance further includes a controller and a driving mechanism. The controller is communicatively connected to the driving mechanism. The driving mechanism is disposed on the door body and is in transmission connection with the first door shaft portion. The driving mechanism drives the first door shaft to have a first position and a second position in the direction of the central axis. The first door shaft at the first position is in transmission connection with the acting portion, and the first door shaft at the second position is disconnected from the acting portion.

[0056] The controller is configured to receive an externally triggered switching signal and drive the driving mechanism to operate according to the switching signal. The driving mechanism responds to the control of the controller to drive the first door shaft to switch between the first position and the second position.

[0057] In the above hinge assembly, the first housing is mounted on the box body, and the first door shaft portion is mounted on the door body. When the user acts on the door body to rotate the door body around the box body, the door body drives the first door shaft portion to rotate in the first housing. When the user acts on the door body to open the opening of the box body, the resistance force provided by the acting portion can hinder the first door shaft portion from rotating following the door body, and further hinder the rotation of the door body, so as to be able to slow down the rotation speed of the door body. When the user acts forcefully on the door body and opens the opening, under the hindrance of this resistance force, the opening speed of the door body slows down, and even the opening angle of the door body decreases, which can effectively avoid the risk of collision between the door body and obstacles caused by the user opening the door at a large angle due to inertia. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is a schematic structural view of a first hinge in an embodiment of the present application;

[0059] Figure 2 is Figure 1 an exploded view of the first hinge shown;

[0060] Figure 3 is Figure 2 a partial structural view of the first housing body in the first hinge shown;

[0061] Figure 4 is Figure 2 a first angle view of the spring in the first hinge shown;

[0062] Figure 5 is Figure 2 a second angle view of the spring in the first hinge shown;

[0063] Figure 6 is Figure 2 a structural view of the spring mounting seat in the first hinge shown;

[0064] Figure 7 is an application schematic view of the hinge assembly in an embodiment of the present application;

[0065] Figure 8 It is a sectional view of the first hinge at the first angle in an embodiment of the present application;

[0066] Figure 9 It is Figure 8 A partial structural schematic diagram of the first hinge shown at the second angle;

[0067] Figure 10 It is Figure 2 A position diagram of the door shaft wheel in the first hinge shown at the first angle;

[0068] Figure 11 It is Figure 2 A position diagram of the door shaft wheel in the first hinge shown at the second angle;

[0069] Figure 12 It is Figure 2 A structural schematic diagram of the door shaft wheel in the first hinge shown;

[0070] Figure 13 It is Figure 2 A structural schematic diagram of the first door shaft in the first hinge shown;

[0071] Figure 14 It is Figure 2 A structural schematic diagram of the first fixing block in the first hinge shown;

[0072] Figure 15 It is Figure 2 A structural schematic diagram of the first mounting ring in the first hinge shown;

[0073] Figure 16 It is Figure 2 A structural schematic diagram of the second mounting ring in the first hinge shown;

[0074] Figure 17 It is a structural schematic diagram of the second hinge in an embodiment of the present application;

[0075] Figure 18 It is Figure 17 An exploded view of the second hinge shown;

[0076] Figure 19 It is Figure 18 A structural schematic diagram of the second door shaft part in the second hinge shown;

[0077] Figure 20 It is Figure 18 A structural schematic diagram of the base in the second hinge shown;

[0078] Figure 21 It is Figure 18 A structural schematic diagram of the second fixing block in the second hinge shown;

[0079] Figure 22 The Figure 18 structural schematic diagram of the door closing member in the second hinge shown;

[0080] Figure 23 The Figure 17 structural schematic diagram of the second hinge shown at the first angle;

[0081] Figure 24 The Figure 17 structural schematic diagram of the second hinge shown at the second angle;

[0082] Figure 25 The Figure 17 structural schematic diagram of the second hinge shown at the third angle;

[0083] Figure 26 The state diagram of the first hinge at the first angle in an embodiment of the present application;

[0084] Figure 27 The state diagram of the second hinge at the first angle in an embodiment of the present application;

[0085] Figure 28 The state diagram of the first hinge at the second angle in an embodiment of the present application;

[0086] Figure 29 The state diagram of the second hinge at the second angle in an embodiment of the present application;

[0087] Figure 30 The state diagram of the first hinge at the third angle in an embodiment of the present application;

[0088] Figure 31 The state diagram of the second hinge at the third angle in an embodiment of the present application;

[0089] Figure 32 The state diagram of the household appliance at the first angle in an embodiment of the present application;

[0090] Figure 33 The state diagram of the household appliance at the second angle in an embodiment of the present application;

[0091] Figure 34 The state diagram of the household appliance at the third angle in an embodiment of the present application.

[0092] Explanation of reference numerals:

[0093] 100, hinge assembly; 110, first hinge; 111, first housing; 111a, second mounting hole; 111b, first plug hole; 111c, second plug hole; 111d, first slide groove; 111e, strip hole; 111f, limit groove; 1111, first housing body; 1112, first fixing block; 1112a, mounting cavity; 1112b, first track; 1112c, second track; 1112d, inclined section; 1112e, straight section; 1113, third fixing block; 1114, first mounting ring; 1115, third fixing block; 1116, third fixing ring; 1117, third fixing ring; 1118, third fixing ring; 1119, third fixing ring; 1120, third fixing ring; 1121, third fixing ring; 1122, third fixing ring; 1123, third fixing ring; 1124, third fixing ring; 1125, third fixing ring; 1126, third fixing ring; 1127, third fixing ring; 1128, third fixing ring; 1129, third fixing ring; 1130, third fixing ring; 1131, third fixing ring; 1132, third fixing ring; 1133, third fixing ring; 1134, first mounting ring; 1135, third fixing ring; 1136, third fixing ring; 1137, third fixing ring; 1138, third fixing ring; 1139, first fixing ring; 1140, first fixing ring; 1141, first fixing ring; 1142, first fixing ring; 1143, third fixing ring; 1144, first fixing ring; 1145, first fixing ring; 1146, first fixing ring; 1147, first fixing ring; 1148, first fixing ring 14a, first matching part; 1114b, first sliding groove; 1115, second mounting ring; 1115a, second sliding groove; 1115b, second matching part; 1116, spring bottom cover; 112, first door axis; 1121, door axis wheel; 1121a, limit part; 112b, second protrusion; 1122, first door axis; 1122a, first protrusion; 113, action part; 1131, preload; 1131a, spring; 1131a1, first end; 1131a2, second end; 1131b, spring Mounting seat; 1131b1, first mounting hole; 1131b2, through hole; 1131b3, bump; 1132, transmission member; 1132a, preload wheel; 1132b, intermediate wheel; 120, second hinge; 121, second shell; 1211, second shell body; 1212, base; 121a, second slide groove; 121a1, first mating end; 121a2, second mating end; 121a3, transition section; 12101, transfer surface; 12102, contact surface; 12103, transition slope; 12104, Avoidance space; 1213, second fixed block; 1213a, third slide groove; 1213b, inner guide rail; 1214, hanging ear; 1215, blocking piece; 122, second door axis; 1221, second door axis; 1222, frustum; 1223, protrusion; 1224, first limiting ring; 1225, second limiting ring; 1126, blocking block; 123, door closing member; 1231, mounting axis; 1231a, axis hole; 1231b, notch; 1232, hook; 1233, blocking block; 200, box body; 300, door body. DETAILED DESCRIPTION

[0094] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0095] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0096] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0097] In the present application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0098] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0099] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0100] Household appliances usually include a box body and a door body. The box body has an opening. The door body is rotatably arranged at the opening of the box body. The door body can open and close the opening under the action of external force. The door body can be rotatably connected to the box body through a rotating shaft, a hinge, etc. The hinge assembly provided in this application is introduced below.

[0101] See also Figure 1 and Figure 2 In one embodiment of the present application, a hinge assembly 100 is provided, including a first hinge 110, the first hinge 110 includes a first shell 111, a first door axis portion 112 and an action portion 113, the first shell 111 is configured to be connected to the box body 200, the first door axis portion 112 has a central axis, and is rotatably connected to the first shell 111 around the central axis, the first door axis portion 112 is configured to be fixedly connected to the door body 300, and when the door body 300 opens and closes the opening of the box body 200, it rotates relative to the first shell 111 with the door body 300, the action portion 113 is disposed in the first shell 111, and is transmission-connected to the first door axis portion 112, and the action portion 113 is constructed to provide a resisting force that prevents the first door axis portion 112 from following the door body 300 to open the opening of the box body 200.

[0102] In the above-mentioned hinge assembly 100, during actual operation, the first housing 111 is installed on the box body 200, and the first door axis portion 112 is installed on the door body 300. When the user acts on the door body 300 to make the door body 300 rotate around the box body 200, the door body 300 drives the first door axis portion 112 to rotate in the first housing 111. When the user acts on the door body 300 to make the door body 300 open the opening of the box body 200, the hindering force provided by the acting portion 113 can hinder the first door axis portion 112 from rotating with the door body 300, thereby hindering the door body 300 from rotating, thereby slowing down the rotation speed of the door body 300. When the user acts on the door body 300 with great force and opens the opening, the opening speed of the door body 300 is slowed down under the hindrance of the hindering force, and even the opening angle of the door body 300 is reduced, which can effectively avoid the risk of the door body 300 colliding with obstacles due to the user's inertia of opening the door at a large angle.

[0103] It should be noted that in actual application, the door body 300 can be connected to the box body 200 only through the hinge assembly 100. For example, there are two first hinges 110, and the two first hinges 110 connect the box body 200 and the door body 300 at both ends in the vertical direction. The door body 300 can also be rotatably connected to the box body 200 through a structure such as a rotating shaft, and then connected through the hinge assembly 100. Of course, the embodiment of the present application does not limit the specific opening method of the door body 300, and it can be left-opening, right-opening, upper-opening, lower-opening, etc.

[0104] There are many ways to construct the action part 113, such as a combination of a motor and a belt, where the blocking force provided by the motor acts on the first door shaft part 112 through the belt. Alternatively, the solution in the following embodiment is adopted.

[0105] Preferably, the first housing 111 has a transition portion extending in a direction parallel to the central axis, and the transition portion is configured to be rotatably connected to the box body 200. At this time, the first housing 111 is rotatably connected to the box body 200 using the transition portion, which helps to expand the opening angle of the door body 300 and reduce the collision between the door body 300 and the box body 200.

[0106] In some embodiments, see Figure 2 The action part 113 includes a pre-tightening member 1131 and a transmission member 1132. The pre-tightening member 1131 is connected to the transmission member 1132. The transmission member 1132 is rotatably arranged in the first housing 111 around a direction parallel to the central axis. The transmission member 1132 is transmission-connected to the first door shaft 112. In the process of the first door shaft 112 following the door body 300 opening, the transmission member 1132 is driven to rotate. The pre-tightening member 1131 is used to provide a blocking force that slows down the rotation speed of the transmission member 1132.

[0107] In actual operation, when the user opens the door body 300, the first door axis portion 112 rotates with the door body 300 in the first shell 111, and the rotating first door axis portion 112 drives the transmission member 1132 to rotate. The rotating transmission member 1132 further drives the pre-tightening member 1131 to store elastic force. The elastic force stored in the pre-tightening member 1131 reacts to the transmission member 1132 and hinders the rotation of the transmission member 1132, slowing down the rotation speed of the rotating member, and then slowing down the rotation speed of the first door axis portion 112, so as to achieve the effect of hindering the rotation of the door body 300. At the same time, when the external force applied by the user to the door body 300 disappears, the elastic force stored in the pre-tightening member 1131 prompts the first door axis portion 112 to rotate in the opposite direction, which helps to achieve the automatic closing of the door body 300. In this embodiment, the elastic force stored in the pre-tightening member 1131 is used to provide the hindering force, which is more economical and has a simpler structure than using a motor or other structure.

[0108] Specifically in the embodiment, see Figure 3 ,Figure 4 and Figure 5 The pre-tightening member 1131 includes a clockwork spring 1131a. The clockwork spring 1131a is curled and arranged in a first direction parallel to the central axis. The two ends of the clockwork spring 1131a in its own curling direction are respectively a first end 1131a1 and a second end 1131a2. The first end 1131a1 of the clockwork spring 1131a is configured to be fixedly connected to the transmission member 1132, and the second end 1131a2 of the clockwork spring 1131a is connected to the first housing 111. During the process that the first door shaft portion 112 follows the door body 300 to open the opening of the box body 200, the first end 1131a1 of the clockwork spring 1131a rotates following the transmission member 1132 to cause the clockwork spring 1131a to tighten and generate the above-mentioned resistance force.

[0109] During actual operation, when the transmission member 1132 drives the second end 1131a2 to rotate, the clockwork spring 1131a gradually tightens. During the tightening process, the clockwork spring 1131a stores part of the energy generated by the transmission member 1132 during rotation as elastic force, so that the energy of the transmission member 1132 itself is reduced, its speed slows down, and further slows down the opening speed of the door body 300. When the action of the user on the door body 300 disappears, the tightened clockwork spring 1131a loosens and drives the door body 300 to automatically close through the transmission member 1132 and the first door shaft portion 112. At this time, the clockwork spring 1131a stores elastic torsion. Compared with a linear spring, it has a small installation space and provides a large resistance force. At the same time, compared with a torsion spring that can generate elastic torsion, the clockwork spring 1131a has better reliability and longer service life. Further, refer to Figure 2 and Figure 6 The pre-tightening member 1131 further includes a clockwork spring mounting seat 1131b. The clockwork spring 1131a is sleeved outside the clockwork spring mounting seat 1131b. The clockwork spring mounting seat 1131b has a first mounting hole 1131b1 arranged in the first direction. The transmission member 1132 is fixedly connected to the first mounting hole 1131b1. The first end 1131a1 is connected to the clockwork spring mounting seat 1131b, and the second end 1131a2 is connected to the first housing 111.

[0110] At this time, the clockwork spring mounting seat 1131b is used to fixedly connect the first end 1131a1 of the clockwork spring 1131a and the transmission member 1132, and at the same time the clockwork spring mounting seat 1131b can also support the clockwork spring 1131a. When the transmission member 1132 rotates, it drives the first end 1131a1 to rotate, and at the same time the clockwork spring mounting seat 1131b also rotates synchronously.

[0111] Understandably, at this time, the first end 1131a1 of the clockwork spring 1131a is located inside the clockwork spring 1131a, and the second end 1131a2 of the clockwork spring 1131a is located outside the clockwork spring 1131a. Optionally, the clockwork spring mounting seat 1131b has a through hole 1131b2 that penetrates its side wall and communicates with the first mounting hole 1131b1. The first end 1131a1 passes through the through hole 1131b2 and is fixedly connected to the through hole 1131b2.

[0112] Furthermore, the first end 1131a1 of the clockwork spring 1131a has a first connection protrusion 1223 protruding inward, and the first connection protrusion 1223 is connected inside the through hole 1131b2. Of course, other structures can also be provided to connect the clockwork spring mounting seat 1131b and the transmission member 1132, which is not limited here. Similarly, the second end 1131a2 of the clockwork spring 1131a has a second connection protrusion 1223 protruding outward, and the second connection protrusion 1223 is connected to the first housing 111.

[0113] Furthermore, referring to Figure 2 , the first housing 111 has a second mounting hole 111a coaxially arranged with the first mounting hole 1131b1, and the clockwork spring 1131a and the clockwork spring mounting seat 1131b are located in the second mounting hole 111a. The hole wall of the second mounting hole 111a has a first jack 111b, a first chute 111d, and a second jack 111c. The first chute 111d extends around a first direction. The first jack 111b is located at one end in the extending direction of the first chute 111d and penetrates the bottom of the first chute 111d. The second jack 111c is located at the other end in the extending direction of the first chute 111d and penetrates the bottom of the first chute 111d. The hole depth of the first jack 111b is greater than the hole depth of the second jack 111c, and the groove depth of the first chute 111d gradually becomes shallower from the end where the first jack 111b is located to the end where the second jack 111c is located. During the process that the first end 1131a1 of the clockwork spring 1131a rotates to cause the clockwork spring 1131a to tighten and generate a resistance force, the second end 1131a2 of the clockwork spring 1131a moves from the first jack 111b along the first chute 111d to the second jack 111c.

[0114] During actual operation, when the door body 300 is in the closed state, the winding spring 1131a is in the released state. At this time, the outer diameter of the winding spring 1131a is the largest, and the second end 1131a2 of the winding spring 1131a is inserted relatively deeply into the first jack 111b. As the door body 300 continuously opens the opening of the box body 200, the winding spring 1131a gradually tightens, causing the insertion depth of the second end 1131a2 of the winding spring 1131a into the first jack 111b to gradually become shorter. When the winding spring 1131a tightens to a certain radius, the second end 1131a2 of the winding spring 1131a disengages from the first jack 111b, enters the first chute 111d, and continues to tighten and shrink in the first chute 111d. Finally, when it reaches the maximum opening angle (the second angle in the following text), the second end 1131a2 of the winding spring 1131a is inserted into the second jack 111c. When the door body 300 closes, the winding spring 1131a gradually loosens, and its outer diameter gradually increases, causing the second end 1131a2 of the winding spring 1131a to disengage from the second jack 111c, continue to loosen along the first chute 111d, and finally snap into the first jack 111b and continue to loosen to the initial state in the first jack 111b. At this time, when sliding in the first chute 111d, although the winding spring 1131a continuously tightens or loosens, its speed is not as fast as that in the first jack 111b. Setting the first chute 111d can reduce the excessive resistance generated by the over-tightening of the winding spring 1131a, and at the same time, it can also avoid the problem that when only the first jack 111b is set, the second end 1131a2 of the winding spring 1131a disengages from the first jack 111b and cannot be restored for use.

[0115] Furthermore, the first housing 111 further has a winding spring bottom cover 1116, and the winding spring mounting seat 1131b is supported on the winding spring bottom cover 1116.

[0116] Specifically in the embodiment, refer to Figure 2 and Figure 9The transmission member 1132 includes a pre-tightening wheel 1132a, which is in transmission connection with the first door shaft 112, and the pre-tightening wheel 1132a is coaxially inserted into the first mounting hole 1131b1. When the first door shaft 112 follows the door body 300 to open, the pre-tightening wheel 1132a is driven to rotate, and the first end 1131a1 follows the pre-tightening wheel 1132a to rotate, so as to tighten the spring 1131a and generate a resistance force. In actual operation, when the first door shaft 112 follows the door body 300 to rotate, the pre-tightening wheel 1132a is driven to rotate, and the pre-tightening wheel 1132a rotates the spring mounting seat 1131b, and the spring mounting seat 1131b drives the first end 1131a1 of the spring 1131a to rotate, thereby tightening the spring 1131a. Furthermore, the inner wall of the spring mounting seat 1131b has a protrusion 1131b3, and the outer wall of the preload wheel 1132a has a concave hole that matches the protrusion 1131b3. The preload wheel 1132a and the spring mounting seat 1131b are fixedly connected by the protrusion 1131b3 and the concave hole, which can improve the transmission stability of the preload wheel 1132a and the spring mounting seat 1131b.

[0117] The pre-tensioning wheel 1132a is connected to the first door shaft 112 by transmission, including the pre-tensioning wheel 1132a being in contact with the first door shaft 112, such as gear meshing transmission, and also including the pre-tensioning wheel 1132a being connected to the first door shaft 112 by transmission through an intermediate member, which may be a transmission belt, etc. For example, the intermediate member is an intermediate wheel 1132b, and the pre-tensioning wheel 1132a is connected to the first door shaft 112 by gear meshing transmission through the intermediate wheel 1132b.

[0118] The above is only an example of the structure of the transmission member 1132 and is not a limitation.

[0119] In some embodiments, see Figure 7 The hinge assembly 100 further includes a second hinge 120, which is used to connect the box body 200 and the door body 300 and support the door body 300 to rotate relative to the box body 200. The first hinge 110 is configured at one end of the door body 300 in the direction of the central axis, and the second hinge 120 is configured at the other end of the door body 300 in the direction of the central axis.

[0120] In this embodiment, the first hinge 110 and the second hinge 120 work together to support the door body 300 and provide a certain blocking force when opening the door body 300 to prevent the door body 300 from colliding with obstacles. In actual operation, the central axis can be set in the vertical direction.

[0121] In some embodiments, see Figure 32 , Figure 33 and Figure 34, the first hinge portion 112 is configured to be controlled to rotate about the central axis between a sequentially increasing first angle, a second angle, and a third angle, and to be controlled to move between a driving position and a free position in a second direction perpendicular to the central axis. When the first hinge portion 112 rotates between the first angle and the second angle, the first hinge portion 112 is located at the driving position and is in driving connection with the acting portion 113. When the first hinge portion 112 rotates between the second angle and the third angle, the first hinge portion 112 is located at the free position and is disconnected from the acting portion 113. Correspondingly, the second hinge 120 is configured to allow the door body 300 to move along itself in the second direction.

[0122] Due to the need to consider the physical movement dimension problem between the door body 300 and the box body 200, the opening angle of the door body 300 is usually within 130 degrees, which can meet the daily needs of users but has limitations in some special demand occasions. For example, when the user is cleaning or repairing the refrigeration appliance, the insufficient opening angle of the door body 300 will affect the user's cleaning or repair.

[0123] In this embodiment, when the door body 300 rotates between the first angle and the second angle (usually the first angle is 0 degree and the second angle is 130 degrees), the first hinge portion 112 is located at the driving position, and the first hinge portion 112 located at the driving position is in driving connection with the acting portion 113. At this time, the acting portion 113 can be used to provide a resistance force to the door body 300 during the opening process to prevent the door body 300 from colliding with obstacles, which is suitable for the daily needs of users. When the user has special needs and needs to expand the opening angle of the door body 300, at this time the door body 300 has already been at the second angle. The user applies an external force to the door body 300 to make the door body 300 move a certain distance in the second direction to the free position. At this time, the door body 300 has a larger rotation space, and the first hinge portion 112 is disconnected from the acting portion 113. The door body 300 rotating at the free position will not be hindered by the acting portion 113. In this way, the special needs of the user are met. Of course, during the process of the door body 300 moving in the second direction, it also generates a displacement relative to the second hinge 120 in the second direction, and the second hinge 120 is structurally allowed to move the door body 300 along itself in the second direction.

[0124] It can be understood that the driving position is arranged closer to the box body 200 than the free position.

[0125] Specifically in the embodiment, refer to Figure 2 、 Figure 8 and Figure 9, the first door shaft portion 112 includes a door shaft wheel 1121 and a first door shaft 1122 that are coaxially coupled along the central axis. The first door shaft 1122 is configured to be fixedly connected to the door body 300 and is rotatably connected to the first housing 111. The door shaft wheel 1121 is rotatably disposed in the first housing 111 and is drivingly connected to the acting portion 113. When an external force acts on the door body 300 to move in the second direction, the door shaft wheel 1121 is driven by the first door shaft 1122 to move between a driving position and a free position. Wherein, the door shaft wheel 1121 can be a gear and is in meshing transmission with the acting portion 113. Of course, in other embodiments, the structure of the first door shaft portion 112 is not limited thereto.

[0126] Further, referring to Figure 3 , the first housing 111 has a strip-shaped hole 111e extending along the central axis. The length direction of the strip-shaped hole 111e corresponds to the second direction. The door shaft wheel 1121 is rotatably and movably disposed in the strip-shaped hole 111e. The driving position and the free position of the door shaft wheel 1121 correspond to both ends of the strip-shaped hole 111e in its own length direction.

[0127] At this time, when the user acts on the door body 300 to cause the door body 300 to move in the second direction, the first door shaft 1122 follows the door body 300 to move and drives the door shaft wheel 1121 to move. When moving, the door shaft wheel 1121 moves along the strip-shaped hole 111e from one end of the strip-shaped hole 111e to the other end of the strip-shaped hole 111e.

[0128] It can be understood that part of the door shaft wheel 1121 is located in the strip-shaped hole 111e, and at least a part located outside the strip-shaped hole 111e is located in the first housing 111 and can be drivingly connected to the acting portion 113 when in the driving position. As for whether the connection between the door shaft wheel 1121 and the first door shaft 1122 is located in the strip-shaped hole 111e, there is no limitation.

[0129] Further, referring to Figure 10 and Figure 11 , the first housing 111 further has a limiting groove 111f. The limiting groove 111f is arranged around the outer periphery of the strip-shaped hole 111e. The limiting groove 111f includes a first arc segment, a straight segment, and a second arc segment that are sequentially connected. The door shaft wheel 1121 has a limiting portion 1121a. The limiting portion 1121a is movably arranged along the limiting groove 111f. When the door shaft wheel 1121 is in the driving position, the limiting portion 1121a is located at the first arc end. When the door shaft wheel 1121 moves between the driving position and the free position, the limiting portion 1121a moves along the straight segment. When the door shaft wheel 1121 is in the free position, the limiting portion 1121a is located in the second arc segment.

[0130] During actual operation, when the door hinge wheel 1121 moves along the strip-shaped hole 111e, the limiting portion 1121a moves synchronously within the straight section, thus preventing the door hinge wheel 1121 from rotating and interfering with the movement of the door body 300. When the door hinge wheel 1121 rotates at the transmission position, the limiting portion 1121a moves along the first arc section, and the rotation range of the door hinge wheel 1121 at the transmission position can be limited by the length of the first arc section. Similarly, when the door hinge wheel 1121 needs to rotate at the free position, the limiting portion 1121a moves along the second arc section, and the rotation range of the door hinge wheel 1121 at the free position can be limited by the length of the second arc section. The lengths of the first arc section and the second arc section are set according to the actual situation.

[0131] Specifically, referring to Figure 2 , the limiting groove 111f can be defined and formed by the first housing body 1111 and the third fixing block 1113 in the following text. A strip-shaped hole 111e is formed on the first housing body 1111, and a groove is formed at one end of the strip-shaped hole 111e located inside the first housing body 1111. A hole with the same shape and communication as the strip-shaped hole 111e is formed on the inner wall of the third fixing block 1113, and the outer wall of the third fixing block 1113 and the groove wall of the groove form the above-mentioned limiting groove 111f. Of course, the structure of the limiting groove 111f is not limited to the above solution.

[0132] Specifically in the embodiment, referring to Figure 17 , Figure 18 , Figure 19 and Figure 20 , the second hinge 120 includes a second housing 121 and a second door hinge portion 122. The second housing 121 is configured on the box body 200, and the second door hinge portion 122 is configured to be fixedly connected to the door body 300. The second door hinge portion 122 is coaxially arranged with the first door hinge portion 112. The second housing 121 has a second sliding groove 121a arranged along the second direction. The second door hinge portion 122 is movably and rotatably arranged in the second sliding groove 121a around the central axis. The two ends of the second sliding groove 121a in its own extending direction are respectively a first mating end 121a1 and a second mating end 121a2. When the second door hinge portion 122 is located at the first mating end 121a1, the door hinge wheel 1121 is located at the transmission position. When the second door hinge portion 122 is located at the second mating end 121a2, the door hinge wheel 1121 is located at the free position.

[0133] At this time, when the door hinge wheel 1121 follows the first door hinge 1122 (the first door hinge 1122 follows the door body 300) and moves from the transmission position to the free position, the second door hinge portion 122 moves from the first mating end 121a1 of the second chute 121a to the second mating end 121a2. In this way, the second door hinge portion 122 can move following the movement of the door body 300. Understandably, the second door hinge portion 122 is rotatably arranged at both the first mating end 121a1 and the second mating end 121a2 to follow the rotation of the door body 300 between the first angle and the second angle and between the second angle and the third angle.

[0134] Specifically, in a further embodiment, refer to Figure 20 , the second chute 121a further has a transition section 121a3 connecting the first mating end 121a1 and the second mating end 121a2. The projection position of the support surface of the transition section 121a3 on the central axis is closer to the first housing 111 than the projection positions of the support surfaces of the first mating end 121a1 and the second mating end 121a2 on the central axis, and the projection positions of the support surfaces of the first mating end 121a1 and the second mating end 121a2 on the central axis coincide. Correspondingly, the first door hinge 1122 is configured to have an initial position and a lifted position in the direction of the central axis. The initial position is closer to the second housing 121 than the lifted position. When the second door hinge portion 122 is controlled to move from the first mating end 121a1 to the transition section 121a3, the first door hinge 1122 is controlled to advance from the initial position to the lifted position. When the second door hinge portion 122 is controlled to move from the transition section 121a3 to the second mating end 121a2, the first door hinge 1122 is controlled to retreat from the lifted position to the initial position. The door hinge wheel 1121 follows the movement of the first door hinge 1122 at least when moving between the transmission position and when moving between the transmission position and the free position.

[0135] Taking the central axis being arranged in the vertical direction as an example for illustration. When the user acts on the door body 300 to rotate from the first angle to the second angle, the door hinge portion and the first door hinge 1122 rotate following the door body 300 at the transmission position, and the second door hinge portion 122 rotates following the door body 300 at the first mating end 121a1. When the user needs to increase the opening angle of the door body 300, an external force is provided to the door body 300 to move it in the second direction. At this time, the second door hinge portion 122 moves from the support surface of the first mating end 121a1 to the support surface of the transition section 121a3 and moves along the support surface of the transition section 121a3. During this process, since the projection position of the support surface of the transition section 121a3 on the central axis is higher than the projection position of the support surface of the first mating end 121a1 on the central axis, during the movement of the second door hinge portion 122 from the first mating end 121a1 to the transition section 121a3, the second door hinge portion 122 is lifted upward by a distance L1 (refer to Figure 27 and Figure 29), and then, through the door body 300, the height of the first door shaft 1122 and the door shaft wheel 1121 on the central axis is raised by a distance L3, and the distance L1 is equal to the distance L3. The raised door shaft wheel 1121 is not supported by the first housing 111, which avoids mutual wear between the door shaft wheel 1121 and the first housing 111 during movement, and helps to improve the service life of the first hinge 110. When the second door shaft portion 122 moves to the second mating end 121a2 (see Figure 31 ), the user cannot continue to move the door body 300, and the door body 300 is in place. At this time, when the user continues to rotate the door body 300 from the second angle to the third angle, the first door shaft 1122 and the second door shaft portion 122 rotate accordingly. During this process, since the projection position of the support surface of the second mating end 121a2 on the central axis is lower than the projection position of the support surface of the transition section 121a3 on the central axis, the second door shaft portion 122 descends by a distance L1, and through the door body 300, the first door shaft 1122 descends by a distance L3. At this time, the door shaft wheel 1121 can follow the first door shaft 1122 and descend by a distance L3, and rotate from the second angle to the third angle with the first door shaft 1122 and the door body 300, or it can not follow the first door shaft 1122 and descend, and does not rotate from the second angle to the third angle with the first door shaft 1122 and the door body 300.

[0136] Wherein, the "support surface" is the surface that supports the second door shaft portion 122.

[0137] Specifically, in a further embodiment, see Figure 2 、 Figure 14 and Figure 15 , the first housing 111 includes a first housing body 1111, a first fixing block 1112 and a first mounting ring 1114. The acting portion 113 is arranged inside the first housing body 1111. The first fixing block 1112 is arranged outside the first housing body 1111 and has an installation cavity 1112a. The first mounting ring 1114 is arranged along the central axis in the installation cavity 1112a. The first door shaft 1122 is rotatably arranged in the first mounting ring 1114. The first door shaft 1122 is rotatably and movably arranged along the direction of the central axis in the first mounting ring 1114. When the first door shaft 1122 moves in the first mounting ring 1114, it switches between a first rotation position and a second rotation position on the first mounting ring 1114, and the second rotation position is arranged closer to the second housing 121 than the first rotation position.

[0138] The cavity wall of the installation cavity 1112a has a first track 1112b. The first track 1112b includes an inclined section 1112d and a straight section 1112e that are obtusely angled. The straight section 1112e extends longitudinally along the second direction. One end of the inclined section 1112d facing away from the straight section 1112e is arranged farther from the first housing body 1111 than the straight section 1112e. The outer wall of the first mounting ring 1114 has a first mating portion 1114a that is slidably connected to the first track 1112b.

[0139] When the door shaft wheel 1121 is in the transmission position, the first mating portion 1114a is located at one end of the inclined section 1112d facing away from the straight section 1112e (hereinafter referred to as the starting end), and the first door shaft 1122 is in the first rotation position. When the door shaft wheel 1121 is in the free position, the first mating portion 1114a is located at one end of the straight section 1112e facing away from the inclined section 1112d (hereinafter referred to as the tail end), and the first door shaft 1122 is in the second rotation position.

[0140] During actual operation, refer to Figure 26 and Figure 28 , when the door body 300 rotates from the first angle to near the second angle, the first door shaft 1122 rotates at the second rotation position of the first mounting ring 1114 and drives the door shaft wheel 1121 to rotate. Initially, the first mating portion 1114a of the first mounting ring 1114 is located at the starting end. When approaching the second angle, the first door shaft 1122 rotates to the limit position within the first mounting ring 1114. When the first door shaft 1122 continues to rotate to the second angle, it drives the first mating portion 1114a of the first mounting ring 1114 to enter the straight section 1112e along the inclined portion from the starting end. When it just enters the straight section 1112e, the first door shaft 1122 reaches the second angle (at this time, the first door shaft 1122 is always in the second rotation position). Continuing to refer to Figure 30 , when the first door body 300 moves in the second direction following the door body 300 and moves from the transmission position to the free position, the first mating portion 1114a moves along the straight section 1112e. When in the free position, since the second door shaft portion 122 descends from the transition section 121a3 to the second mating end 121a2, the door body 300 drives the first door shaft 1122 to descend a distance L3. The first door shaft 1122 descends from the second rotation position within the first mounting ring 1114 to the first rotation position. The area where the first rotation position of the first mounting ring 1114 is located supports the first door shaft 1122 to rotate from the second angle to the third angle. At this time, when the first mounting ring 1114 slides from the inclined end to the straight section 1112e, the first door shaft 1122 advances or rises from the initial position to the lifting position, and when the first door shaft 1122 moves from the second rotation position to the first rotation position, the first door shaft 1122 retreats or descends from the lifting position to the initial position.

[0141] Understandably, the projected length of the inclined section 1112d on the central axis is equivalent to the distance L3 mentioned above. The second rotation area corresponding to the second rotation position in the first safety circle is only for the first door shaft 1122 to rotate within the range of the first angle and the adjacent second angle. The first rotation area corresponding to the first rotation position at least supports the first door shaft 1122 to rotate between the second angle and the third angle, and can be flexibly set specifically by setting the rotation ranges of the second rotation area and the first rotation area.

[0142] Preferably, referring to Figure 12 and Figure 13 , an outer wall of the first door shaft 1122 protrudes a first protrusion 1122a toward an inner wall of the first mounting ring 1114. The inner wall of the first mounting ring 1114 has a first sliding groove 1114b arranged around the central axis. The first sliding groove 1114b has two adjacent and identical sub-sliding grooves in the direction of the central axis. The first protrusion 1122a can slide along each sub-sliding groove, and the two sub-sliding grooves respectively correspond to the first rotation position and the second rotation position. In the projection range on the plane perpendicular to the central axis, the projection range of the sub-sliding groove corresponding to the second rotation position (hereinafter referred to as the second sub-sliding groove) is smaller than and located within the projection range of the sub-sliding groove corresponding to the first rotation position (hereinafter referred to as the first sub-sliding groove).

[0143] At this time, after the first protrusion 1122a rotates to the limit position in the second sub-sliding groove (when reaching the adjacent second angle), it can retreat or descend (when reaching the free position) into the first sub-sliding groove to continue rotating. And restricting the projection range of the first sub-sliding groove to include and be larger than the projection range of the second sub-sliding groove is for the convenience of processing, and secondly, it can allow the first door shaft 1122 mentioned below to still rotate at a large angle when not in transmission connection with the acting part 113 at the second position, so as to be applicable to the use situation without obstacles and facilitate user operation.

[0144] Understandably, the width L2 of the first sliding groove 1114b on the central axis should not be less than the distance L3 mentioned above. The installation cavity 1112a is communicated with the strip-shaped hole 111e mentioned above. The first housing body 1111 and the first fixing block 1112 can be fixedly connected or integrally formed.

[0145] Specifically in some embodiments, referring to Figure 2 and Figure 16, the first door hinge 1122 and the door hinge wheel 1121 are configured to be selectively plugged in the direction of the central axis. The first housing 111 further includes a second mounting ring 1115. The second mounting ring 1115 and the first mounting ring 1114 are coaxially arranged in the mounting cavity 1112a. There is also a second track 1112c arranged in parallel with the first track 1112b in the mounting cavity 1112a. The second track 1112c is arranged closer to the first housing 111 than the first track 1112b. The second mounting ring 1115 is slidably arranged along the second track 1112c, and the door hinge wheel 1121 is only rotatably arranged on the second mounting ring 1115.

[0146] At this time, when the first door hinge 1122 advances or rises from the initial position to the lifting position, the first door hinge 1122 and the door hinge wheel 1121 are plugged in the direction of the central axis. The second mounting ring 1115 follows the door hinge wheel 1121 and is lifted, and moves from the inclined section 1112d of the second track 1112c to the straight section 1112e of the second track 1112c. When in the free position, due to the restriction of the second mounting ring 1115, if the first door hinge 1122 and the door hinge wheel 1121 are still connected, the first door hinge 1122 cannot follow the door body 300 and retreat or descend to the initial position, and thus cannot follow the door body 300 to continue rotating. Therefore, it is necessary to separate the first door hinge 1122 and the door hinge wheel 1121. The setting of the second mounting ring 1115 can support the door hinge wheel 1121, thereby improving the movement stability of the door hinge wheel 1121 when moving in the second direction after being lifted.

[0147] Specifically, the opposite ends of the first door hinge 1122 and the door hinge wheel 1121 are engaged in a concave-convex manner along the central axis. When the first door hinge 1122 follows the door body 300 and is lifted, it can be plugged into the door hinge wheel 1121, so that it can drive the door hinge wheel 1121 to move together when rotating in the reverse direction. When the first door hinge 1122 follows the door body 300 and descends, it can be disconnected from the door hinge wheel 1121, facilitating the first door hinge 1122 to continue to rotate forward following the door body 300. Among them, the opening angle of the door body 300 increases when rotating forward and decreases when rotating in the reverse direction.

[0148] Specifically and optionally, refer to Figure 16 , the inner wall of the second mounting ring 1115 has a second sliding groove 1115a arranged around the central axis. The outer wall of the second mounting ring 1115 has a second mating portion 1115b protruding towards the inner wall of the mounting cavity 1112a. The second mating portion 1115b is slidably engaged with the second track 1112c. The door hinge wheel 1121 has a second protruding portion 112b slidably engaged with the second sliding groove 1115a. The rotation range of the second sliding groove 1115a allows the door hinge wheel 1121 to rotate between a first angle and a second angle.

[0149] In some embodiments, refer to Figure 19 andFigure 20 , the second door shaft portion 122 includes a second door shaft 1221, a frustum 1222, and a protrusion 1223. The large-diameter end of the frustum 1222 is coaxially connected to one axial end of the second door shaft 1221. The protrusion 1223 protrudes from the small-diameter end of the frustum 1222 along the direction of the central axis and is eccentrically arranged with respect to the small-diameter end of the frustum 1222. Both the first mating end 121a1 and the second mating end 121a2 have a transition surface 12101 that mates with the tapered surface of the frustum 1222, a contact surface 12102 that mates with the small-diameter end of the frustum 1222, an avoidance space 12104 for the protrusion 1223 to move, and a transition inclined surface 12103 for the protrusion 1223 to perform a transitional movement between the avoidance space 12104 and the contact surface 12102. The transition section 121a3 transitionally connects the transition surface 12101 of the first mating end 121a1 and the transition surface 12101 of the second mating end 121a2. The transition inclined surface 12103, the transition surface 12101, the contact surface 12102, and the avoidance space 12104 are arranged in sequence along the direction of the central axis.

[0150] During actual operation, when the second door shaft portion 122 rotates at the first mating end 121a1 or the second mating end 121a2, the frustum 1222 is supported on the contact surface 12102 and rotates along the transition surface 12101, and the protrusion 1223 moves within the avoidance space 12104. When the second door shaft portion 122 switches from the first mating end 121a1 to the transition section 121a3, the second door shaft 1221 rotates, and the protrusion 1223 enters the contact surface 12102 of the first mating end 121a1 from the transition inclined surface 12103 of the first mating end 121a1, causing the frustum 1222 to rise along the transition surface 12101. As the second door shaft 1221 continues to rotate, the second door shaft portion 122 rises to the transition section 121a3 (at this time, the first mounting ring 1114 moves from the inclined end to the straight section 1112e). When the door body 300 moves in the second direction, the second door shaft portion 122 moves from the transition section 121a3 toward the second mating end 121a2 (at this time, the first mounting ring 1114 moves toward the end of the straight end). When reaching the second mating end 121a2, the protrusion 1223 of the second door shaft portion 122 falls into the avoidance space 12104 through the transition surface 12101, the contact surface 12102, and the transition inclined surface 12103 of the second mating end 121a2 (at this time, the first door shaft 1122 descends).

[0151] It is understandable that since the second track 1112c is parallel to the first track 1112b, the second track 1112c has its own inclined section 1112d and straight section 1112e.

[0152] Specifically, in a further embodiment, refer to Figure 19, the second door shaft portion 122 further includes a first limiting ring 1224 and a second limiting ring 1225. The first limiting ring 1224 and the second limiting ring 1225 are coaxially sleeved on the second door shaft 1221, and there is a receiving groove between the first limiting ring 1224 and the second limiting ring 1225. The second housing 121 further has a third sliding groove 1213a, and the inner wall of the third sliding groove 1213a has an inner guide rail 1213b. The second door shaft 1221 is rotatably disposed in the third sliding groove 1213a. The end of the third sliding groove 1213a away from the second sliding groove 121a is limited in the receiving groove and can move along the receiving groove in the direction of the central axis. The first limiting ring 1224 is located outside the third sliding groove 1213a, the second limiting ring 1225 is located inside the third sliding groove 1213a, and the second limiting ring 1225 is supported on the inner guide rail 1213b.

[0153] At this time, the second door shaft 1221 is connected to the second fixing block 1213 by using the first limiting ring 1224 and the second limiting ring 1225. At the same time, the receiving groove between the first limiting ring 1224 and the second limiting ring 1225 can allow the second door shaft 1221 to lift and lower along the second fixing block 1213, and the inner guide rail 1213b is used for cooperation to support the second door shaft 1221, which can improve the movement stability of the second door shaft 1221. Understandably, the shape of the inner guide rail 1213b is adapted to the movement track of the second door shaft 1221 so that the second limiting ring 1225 is always supported on the inner guide rail 1213b.

[0154] Specifically, referring to Figure 18 , the second housing 121 includes a second housing body 1211, a second fixing block 1213 and a base 1212. The second housing body 1211 is configured in the box body 200. The second housing body 1211 has an installation groove, and the second fixing block 1213 and the base 1212 are coaxially installed in the installation groove. The base 1212 has a second sliding groove 121a, and the second fixing block 1213 has a third sliding groove 1213a. Among them, the second housing body 1211, the second fixing block 1213 and the base 1212 are detachably connected, and the second sliding groove 121a and the third sliding groove 1213a are respectively arranged on the base 1212 and the second fixing block 1213 for convenient replacement. Of course, in other embodiments, the second housing body 1211, the second fixing block 1213 and the base 1212 can also be integrally formed.

[0155] In some embodiments, referring to Figure 18 and Figure 22, the second hinge 120 further includes a door closing member 123. One side of the door closing member 123 has a mounting shaft 1231. The mounting shaft 1231 has a shaft hole 1231a, and the shaft hole 1231a is engaged with the second door shaft portion 122. The mounting shaft 1231 is configured to be fixedly connected to the door body 300. On the second housing 121, a hanging ear 1214 and a stop piece 1215 are respectively provided corresponding to the first angle and the second angle. The door closing member 123 has a hook 1232 and a stop block 1233. When the door body 300 is at the first angle, the hook 1232 is hooked to the hanging ear 1214. When the door body 300 is at the second angle, the stop block 1233 abuts against the stop piece 1215. During the process of the second door shaft portion 122 moving from the first mating end 121a1 to the second mating end 121a2, the stop block 1233 is separated from the stop piece 1215.

[0156] During actual operation, when the door body 300 is at the first angle, the hook 1232 is hooked to the hanging ear 1214, which can make the door body 300 tightly close the opening of the box body 200 (see Figure 23 ). When the door body 300 is at the second angle, the stop block 1233 abuts against the stop piece 1215, which can limit the door body 300 from driving the first door shaft 1122 at the transmission position to continue rotating (see Figure 24 ). When it is necessary to increase the opening angle of the door body 300, the door body 300 moves in the second direction. At this time, the door closing member 123 follows and moves in the second direction under the action of the second door shaft portion 122, so that the stop block 1233 is separated from the stop piece 1215. At this time, the door closing member 123 does not limit the door body 300 from continuing to rotate (see Figure 25 ). The setting of the door closing member 123 can limit the door body 300 to only rotate between the first angle and the second angle when the user does not need to increase the opening angle of the door body 300.

[0157] Specifically, on the outer wall of the second door shaft 1221, there is a clamping block 1226 extending axially. In the shaft hole 1231a, there is a notch 1231b that cooperates with the clamping block 1226. The second door shaft 1221 is movably connected to the shaft hole 1231a through the cooperation of the clamping block 1226 and the notch 1231b.

[0158] In the hinge assembly 100 provided in the embodiment of the present application, the first housing 111 is installed on the box body 200, and the first door axis portion 112 is installed on the door body 300. When the user acts on the door body 300 to make the door body 300 rotate around the box body 200, the door body 300 drives the first door axis portion 112 to rotate in the first housing 111. When the user acts on the door body 300 to make the door body 300 open the opening of the box body 200, the hindering force provided by the acting portion 113 can hinder the first door axis portion 112 from rotating with the door body 300, thereby hindering the door body 300 from rotating, thereby slowing down the rotation speed of the door body 300. When the user acts on the door body 300 with great force and opens the opening, the opening speed of the door body 300 is slowed down under the hindrance of the hindering force, and even the opening angle of the door body 300 is reduced, which can effectively avoid the risk of the door body 300 colliding with obstacles due to the user's inertia of opening the door at a large angle.

[0159] In one embodiment of the present application, a household appliance is further provided, comprising a box body 200, a door body 300 and a hinge assembly 100 provided in any of the above embodiments, wherein the door body 300 is arranged at the opening of the box body 200, the hinge assembly 100 connects the door body 300 and the box body 200, and the door body 300 opens and closes the opening under the action of an external force. Since the household appliance comprises the above hinge assembly 100, it comprises all the above beneficial effects, which are not described in detail here.

[0160] In some embodiments, the first door axis portion 112 includes a first door axis 1122, which is rotatably disposed on the first shell 111 and movably connected to the first shell 111 and the door body 300 along the central axis. The household appliance also includes a controller and a driving mechanism, the controller is communicatively connected to the driving mechanism, the driving mechanism is disposed on the door body 300 and is transmission-connected to the first door axis portion 112, and the driving mechanism drives the first door axis 1122 to have a first position and a second position in the direction of the central axis; the first door axis 1122 at the first position is transmission-connected to the action portion 113, and the first door axis 1122 at the second position is disconnected from the action portion 113. The controller is used to receive a switching signal triggered externally and drive the driving mechanism to work according to the switching signal, and the driving mechanism drives the first door axis 1122 to switch between the first position and the second position in response to the control of the controller.

[0161] In this embodiment, the user can choose whether to activate the obstacle protection according to the environment where the household appliance is located. When the household appliance is placed in a spacious space and there is no collision between the household appliance and obstacles, the user can trigger a switching signal to make the controller control the driving mechanism to drive the first door shaft 1122 to be in the second position. At this time, the first door shaft 1122 is disconnected from the acting part 113, and the acting part 113 does not hinder the opening of the door body 300, facilitating the user to open and close the door. When the household appliance is placed in a narrow space or there are other temporary items around the refrigerator hindering the opening of the door, the user can trigger a switching signal to make the controller control the driving mechanism to drive the first door shaft 1122 to be in the first position. At this time, the first door shaft 1122 is in transmission connection with the acting part 113, and the acting part 113 can provide a resistance force to hinder the opening of the door body 300 to avoid collision between the door body 300 and obstacles on the side of the box body 200. In this way, it greatly facilitates the user's use and also broadens the usage conditions of the household appliance.

[0162] Among them, when the first door shaft 1122 is in the first position, the second door shaft 1221 is in the initial position mentioned above. It should be noted that at this time, the width L2 of the first sliding groove 1114b on the central axis mentioned above should be greater than twice the distance L3 mentioned above. Since when the first door shaft 1122 is in the second position, the first protruding part 1122a in the first door shaft 1122 is located in the second sub-sliding groove, if the distance L2 is equal to the distance L3 at this time, when the door body 300 rises by a distance L1 under the lifting of the second door shaft part 122, the first protruding part 1122a will partially enter the first sub-sliding groove, which will further limit the rotation range of the first door shaft 1122 in the non-obstacle protection state. The distance L2 being greater than twice the distance L3 can prevent the first protruding part 1122a of the first door shaft 1122 from entering the first sub-sliding groove under non-obstacle protection, so that the door body 300 has a larger opening angle.

[0163] Among them, the household appliance can be an appliance such as a refrigerator or a disinfection cabinet.

[0164] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0165] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A hinge assembly for connecting a door body (300) and a box body (200), the door body (300) being provided at an opening of the box body (200), the door body (300) opening and closing the opening under the action of an external force, characterized in that, The hinge assembly (100) includes a first hinge (110), and the first hinge (110) includes: A first housing (111) configured to be connected to the box body (200); A first door shaft portion (112) having a central axis and rotatably connected to the first housing (111) about the central axis. The first door shaft portion (112) is configured to be fixedly connected to the door body (300) and rotates relative to the first housing (111) following the door body (300) when the door body (300) opens and closes the opening; and An acting portion (113) disposed in the first housing (111) and drivingly connected to the first door shaft portion (112). The acting portion (113) is configured to provide a resistance force that hinders the first door shaft portion (112) from following the door body (300) to open the opening; The acting portion (113) includes a pre-tightening member (1131) and a transmission member (1132). The pre-tightening member (1131) is connected to the transmission member (1132). The transmission member (1132) is rotatably disposed in the first housing (111) about a direction parallel to the central axis, and the transmission member (1132) is drivingly connected to the first door shaft portion (112); During the process that the first door shaft portion (112) follows the door body (300) to open the opening, the transmission member (1132) is driven to rotate, and the pre-tightening member (1131) is configured to provide a resistance force that slows down the rotation speed of the transmission member (1132); The pre-tightening member (1131) includes a spring (1131a). The spring (1131a) is curled and arranged about a first direction parallel to the central axis. The two ends of the spring (1131a) in its curling direction are respectively a first end (1131a1) and a second end (1131a2). The first end (1131a1) is configured to be fixedly connected to the transmission member (1132), and the second end (1131a2) is connected to the first housing (111); During the process that the first door shaft portion (112) follows the door body (300) to open the opening, the first end (1131a1) rotates following the transmission member (1132) to cause the spring (1131a) to be tightened and generate the resistance force; The pre-tightening member (1131) further includes a spring mounting seat (1131b). The spring (1131a) is sleeved outside the spring mounting seat (1131b). The spring mounting seat (1131b) has a first mounting hole (1131b1) arranged along the first direction, and the transmission member (1132) is fixedly connected to the first mounting hole (1131b1); The first end (1131a1) is connected to the spring mounting seat (1131b), and the second end (1131a2) is connected to the first housing (111); The first housing (111) has a second mounting hole (111a) coaxially arranged with the first mounting hole (1131b1), and the mainspring (1131a) and the mainspring mounting seat (1131b) are located in the second mounting hole (111a); The hole wall of the second mounting hole (111a) comprises a first plug hole (111b), a first slide groove (111d) and a second plug hole (111c); the first slide groove (111d) is extended around the first direction; the first plug hole (111b) is located at one end in the extension direction of the first slide groove (111d) and passes through the bottom of the first slide groove (111d); the second plug hole (111c) is located at the other end in the extension direction of the first slide groove (111d) and passes through the bottom of the first slide groove (111d); the hole depth of the first plug hole (111b) is greater than the hole depth of the second plug hole (111c); the groove depth of the first slide groove (111d) gradually becomes shallower from the end where the first plug hole (111b) is located to the end where the second plug hole (111c) is located; In the process that the first end (1131a1) rotates to cause the mainspring (1131a) to tighten and generate the blocking force, the second end (1131a2) moves from the first insertion hole (111b) along the first sliding groove (111d) to the second insertion hole (111c); The first shell (111) has a transition portion, the transition portion extends in a direction parallel to the central axis, and the transition portion is configured to be rotatably connected to the box body (200).

2. The hinge assembly according to claim 1, characterized in that, The transmission member (1132) comprises a pre-tightening wheel (1132a), the pre-tightening wheel (1132a) is in transmission connection with the first door shaft portion (112), and one end of the pre-tightening wheel (1132a) is coaxially inserted into the first mounting hole (1131b1); In the process of the first door axis portion (112) following the door body (300) to open the opening, the pre-tensioning wheel (1132a) is driven to rotate, and the first end (1131a1) follows the pre-tensioning wheel (1132a) to rotate to cause the mainspring (1131a) to tighten and generate the blocking force.

3. The hinge assembly according to claim 1, wherein The invention also comprises a second hinge (120), wherein the second hinge (120) is used to connect the box body (200) and the door body (300), and to support the door body (300) to rotate relative to the box body (200); The first hinge (110) is arranged at one end of the door body (300) in the direction of the central axis, and the second hinge (120) is arranged at the other end of the door body (300) in the direction of the central axis.

4. The hinge assembly according to claim 3, wherein The first door shaft portion (112) is configured to be controlled to rotate around the central axis between a first angle, a second angle and a third angle that increase in sequence, and to be controlled to move between a transmission position and a free position in a second direction perpendicular to the central axis; When the first door axis portion (112) rotates between the first angle and the second angle, the first door axis portion (112) is located at the transmission position and is transmission-connected to the action portion (113); when the first door axis portion (112) rotates between the second angle and the third angle, the first door axis portion (112) is located at the free position and is disconnected from the action portion (113); Correspondingly, the second hinge (120) is configured to allow the door body (300) to move along itself in the second direction; The first door axis portion (112) includes a door axis wheel (1121) and a first door axis (1122) coaxially matched along the central axis. When an external force acts on the door body (300) to move along the second direction, the door axis wheel (1121) is driven by the first door axis (1122) to move between the transmission position and the free position; the second hinge (120) includes a second shell (121); The first shell (111) includes a first shell body (1111), a first fixing block (1112) and a first mounting ring (1114); the action portion (113) is arranged in the first shell body (1111); the first fixing block (1112) is arranged outside the first shell body (1111) and has a mounting cavity (1112a); the first mounting ring (1114) is arranged in the mounting cavity (1112a) along the central axis; and the first door shaft (1122) is rotatably arranged on the first mounting ring (1114); The first door shaft (1122) is rotatably and movably arranged on the first mounting ring (1114) along the direction of the central axis, and the first door shaft (1122) switches between a first rotation position and a second rotation position on the first mounting ring (1114) when the first mounting ring (1114) moves, and the second rotation position is arranged closer to the second shell (121) than the first rotation position; The cavity wall of the installation cavity (1112a) is provided with a first track (1112b), the first track (1112b) comprises an inclined section (1112d) and a straight section (1112e) connected at an obtuse angle, the straight section (1112e) extends longitudinally along the second direction, and an end of the inclined section (1112d) away from the straight section (1112e) is arranged farther from the first shell body (1111) than the straight section (1112e); the outer wall of the first installation ring (1114) has a first matching portion (1114a) slidably connected to the first track (1112b); When the door axle wheel (1121) is located at the transmission position, the first matching portion (1114a) is located at the end of the inclined section (1112d) away from the straight section (1112e), and the first door axle (1122) is located at the first rotation position; when the door axle wheel (1121) is located at the free position, the first matching portion (1114a) is located at the end of the straight section (1112e) away from the inclined section (1112d), and the first door axle (1122) is located at the second rotation position; The first door shaft (1122) has a first protrusion (1122a) protruding toward the inner wall of the first mounting ring (1114), and the inner wall of the first mounting ring (1114) has a first sliding groove (1114b) arranged around the central axis, and the first sliding groove (1114b) has two adjacent and identical layers of sub-sliding grooves in the direction of the central axis, and the first protrusion (1122a) can slide along each of the sub-sliding grooves, and the two layers of the sub-sliding grooves correspond one by one to the first rotation position and the second rotation position; In terms of the projection range on a plane perpendicular to the central axis, the projection range of the sub-sliding groove corresponding to the second rotational position is smaller than and located within the projection range of the sub-sliding groove corresponding to the first rotational position.

5. The hinge assembly according to claim 4, wherein, The first door shaft (1122) is configured to be fixedly connected to the door body (300) and rotatably connected to the first shell (111); the door shaft wheel (1121) is rotatably disposed on the first shell (111) and is transmission-connected to the action part (113).

6. The hinge assembly according to claim 5, wherein, The first shell (111) has a strip-shaped hole (111e) extending along the central axis, the length direction of the strip-shaped hole (111e) corresponds to the second direction, and the door shaft wheel (1121) is rotatably and movably arranged in the strip-shaped hole (111e); The transmission position and the free position correspond to two ends of the strip-shaped hole (111e) in its own length direction.

7. The hinge assembly according to claim 6, characterized in that, The first shell (111) further has a limiting groove (111f), the limiting groove (111f) is arranged around the outer circumference of the strip-shaped hole (111e), and the limiting groove (111f) comprises a first arc segment, a straight segment, and a second arc segment connected in sequence; The door axle wheel (1121) is provided with a limiting portion (1121a), and the limiting portion (1121a) is movably arranged along the limiting groove (111f); when the door axle wheel (1121) is in the transmission position, the limiting portion (1121a) is located in the first circular arc segment; when the door axle wheel (1121) moves between the transmission position and the free position, the limiting portion (1121a) moves along the straight section; when the door axle wheel (1121) is in the free position, the limiting groove (111f) is located in the second circular arc segment.

8. The hinge assembly according to claim 5, wherein, The second hinge (120) includes a second door shaft portion (122). The second housing (121) is disposed in the box body (200). The second door shaft portion (122) is configured to be fixedly connected to the door body (300), and the second door shaft portion (122) and the first door shaft portion (112) are coaxially arranged. The second housing (121) has a second chute (121a) arranged along the second direction. The second door shaft portion (122) is movably and rotatably disposed in the second chute (121a) around the central axis. The two ends of the second chute (121a) in its own extending direction are respectively a first mating end (121a1) and a second mating end (121a2). When the second door shaft portion (122) is located at the first mating end (121a1), the door shaft wheel (1121) is located at the transmission position. When the second door shaft portion (122) is located at the second mating end (121a2), the door shaft wheel (1121) is located at the free position.

9. The hinge assembly according to claim 8, wherein The second chute (121a) further has a transition section (121a3) connecting the first mating end (121a1) and the second mating end (121a2). The projection position of the support surface of the transition section (121a3) on the central axis is closer to the first housing (111) than the projection positions of the support surfaces of the first mating end (121a1) and the second mating end (121a2) on the central axis. The projection positions of the support surfaces of the first mating end (121a1) and the second mating end (121a2) on the central axis coincide. Correspondingly, the first door shaft (1122) is configured to have an initial position and a lifted position in the direction of the central axis. The initial position is closer to the second housing (121) than the lifted position. When the second door shaft portion (122) is controlled to move from the first mating end (121a1) to the transition section (121a3), the first door shaft (1122) is controlled to advance from the initial position to the lifted position. When the second door shaft portion (122) is controlled to move from the transition section (121a3) to the second mating end (121a2), the first door shaft (1122) is controlled to retreat from the lifted position to the initial position. The door shaft wheel (1121) follows the movement of the first door shaft (1122) at least when moving between the transmission position and when moving between the transmission position and the free position.

10. The hinge assembly according to claim 9, wherein, The second door shaft portion (122) includes a second door shaft (1221), a frustum (1222), and a protrusion (1223). The large-diameter end of the frustum (1222) is coaxially connected to one axial end of the second door shaft (1221). The protrusion (1223) protrudes along the direction of the central axis from the small-diameter end of the frustum (1222) and is eccentrically arranged with respect to the small-diameter end of the frustum (1222). Both the first mating end (121a1) and the second mating end (121a2) have an adapter surface (12101) that mates with the conical surface of the frustum (1222), a contact surface (12102) that mates with the small-diameter end of the frustum (1222), an avoidance space (12104) for the protrusion (1223) to move, and a transition slope (12103) for the protrusion (1223) to transition between the avoidance space (12104) and the contact surface (12102); The transition section (121a3) transitionally connects the adapter surface (12101) of the first mating end (121a1) and the adapter surface (12101) of the second mating end (121a2), and the transition slope (12103), the adapter surface (12101), the contact surface (12102), and the avoidance space (12104) are arranged in sequence in the direction of the central axis.

11. The hinge assembly according to claim 10, wherein The second door shaft portion (122) further includes a first limiting ring (1224) and a second limiting ring (1225). The first limiting ring (1224) and the second limiting ring (1225) are coaxially sleeved on the second door shaft (1221), and there is a receiving groove between the first limiting ring (1224) and the second limiting ring (1225); The second housing (121) further has a third sliding groove (1213a). The inner wall of the third sliding groove (1213a) has an inner guide rail (1213b). The second door shaft (1221) is rotatably arranged in the third sliding groove (1213a). One end of the third sliding groove (1213a) away from the second sliding groove (121a) is limited in the receiving groove and can move along the receiving groove in the direction of the central axis. The first limiting ring (1224) is located outside the third sliding groove (1213a), the second limiting ring (1225) is located inside the third sliding groove (1213a), and the second limiting ring (1225) is supported on the inner guide rail (1213b).

12. The hinge assembly according to claim 11, characterized in that, The second housing (121) includes a second housing body (1211), a second fixing block (1213), and a base (1212). The second housing body (1211) is configured in the box body (200); The second housing body (1211) has an installation groove. The second fixing block (1213) and the base (1212) are coaxially installed in the installation groove. The base (1212) has the second sliding groove (121a), and the second fixing block (1213) has the third sliding groove (1213a).

13. The hinge assembly according to claim 8, wherein The second hinge (120) further includes a door closing member (123). One side of the door closing member (123) has a mounting shaft (1231). The mounting shaft (1231) has a shaft hole (1231a). The shaft hole (1231a) is engaged with the second door shaft portion (122), and the mounting shaft (1231) is configured to be fixedly connected to the door body (300); On the second housing (121), lugs (1214) and stoppers (1215) are respectively arranged corresponding to the first angle and the second angle. On the door closing member (123), there are hooks (1232) and stoppers (1233); when the door body (300) is at the first angle, the hook (1232) is hooked to the lug (1214), and when the door body (300) is at the second angle, the stopper (1233) abuts against the stopper (1215); During the process that the second door shaft portion (122) moves from the first mating end (121a1) to the second mating end (121a2), the stopper (1233) is separated from the stopper (1215).

14. The hinge assembly according to claim 4, wherein, The first door shaft (1122) and the door shaft wheel (1121) are configured to be selectively inserted in the direction of the central axis; The first housing (111) further includes a second mounting ring (1115). The second mounting ring (1115) and the first mounting ring (1114) are coaxially arranged in the mounting cavity (1112a). In the mounting cavity (1112a), there is also a second track (1112c) arranged in parallel with the first track (1112b). The second track (1112c) is arranged closer to the first housing (111) than the first track (1112b). The second mounting ring (1115) is slidably arranged along the second track (1112c); The door shaft wheel (1121) is only rotatably arranged on the second mounting ring (1115).

15. A household appliance, characterized in that, It includes a box body (200), a door body (300) and a hinge assembly (100) according to any one of claims 1 to 14. The door body (300) is arranged at the opening of the box body (200). The hinge assembly (100) connects the door body (300) and the box body (200). The door body (300) opens and closes the opening under the action of an external force.

16. The household appliance according to claim 15, characterized in that, The first door shaft portion (112) includes a first door shaft (1122). The first door shaft (1122) is rotatably arranged on the first housing (111) and movably connects the first housing (111) and the door body (300) along the central axis; The household appliance further includes a controller and a driving mechanism. The controller is communicatively connected with the driving mechanism. The driving mechanism is arranged on the door body (300) and is in transmission connection with the first door shaft portion (112). The driving mechanism drives the first door shaft (1122) to have a first position and a second position in the direction of the central axis; the first door shaft (1122) at the first position is in transmission connection with the acting portion (113), and the first door shaft (1122) at the second position is disconnected from the acting portion (113); The controller is configured to receive an externally triggered switching signal and drive the driving mechanism to operate according to the switching signal, and the driving mechanism responds to the control of the controller to drive the first door shaft (1122) to switch between the first position and the second position.

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