A refrigerator door with a built-in lock and a refrigerator

Abstract

The present invention relates to the field of refrigerator structures, and particularly to a refrigerator door with a built-in lock, comprising: in this application, a first square hole is opened on the lower end surface of the upper door body, and a second square hole is opened on the upper end of the lower door body. A first square block and a second square block are provided on the internal lock structure. By driving the internal lock structure to move upward, the first square block and the second square block are correspondingly inserted into the first square hole and the second square hole. Since the first square hole, the second square hole, the first square block and the second square block are all square structures, after they are connected in cooperation with each other, the first square hole and the second square hole correspondingly limit the rotation of the first square block and the second square block on the circumferential square, so as to realize the locking function of the upper door body and the lower door body. On the contrary, driving the internal lock structure to move downward can make the first square block and the second square block correspondingly disengage from the first square hole and the second square hole, thereby realizing the unlocking of the upper door body and the lower door body.

Description

Technical Field

[0001] The invention relates to the field of refrigerator structures, and in particular to a refrigerator door with a built-in lock. Background Art

[0002] Some existing refrigerators are equipped with refrigerator locks, which generally include a buckle chain on the refrigerator body and a lock buckle on the refrigerator door, and the refrigerator door and the refrigerator body are locked by the buckle chain and the lock buckle. Alternatively, a socket is provided on the refrigerator body, and a buckle is provided on the refrigerator door, and the refrigerator door and the refrigerator body are locked by inserting the buckle into the socket. Existing refrigerator locks are basically external to the refrigerator, which makes the refrigerator look unsophisticated. Figure 1 .

[0003] Therefore, the prior art still has deficiencies and needs further improvement. Summary of the invention

[0004] To solve the above problems, an object of the present invention is to provide a refrigerator door and a refrigerator with a built-in lock, and to solve the problem that the existing refrigerator locks are all externally mounted on the refrigerator by embedding the refrigerator lock in the refrigerator door.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] The present invention provides a refrigerator door with a built-in lock, comprising: 1. A refrigerator door with a built-in lock, characterized in that it comprises: an upper door body, a lower door body and an inner lock structure, one end of the inner lock structure is connected to the upper door body, and the other end is connected to the lower door body;

[0007] A built-in first square hole is opened on the lower end surface of the upper door body, a built-in second square hole is opened on the upper end surface of the lower door body, a first square block is arranged on the inner locking structure, and a second square block is arranged at one end of the inner locking structure away from the first square block;

[0008] When the upper door body and the lower door body are unlocked, the first square block is away from the first square hole, and the second square block is away from the second square hole; when the upper door body and the lower door body are locked, the first square block and the second square block are correspondingly inserted into the first square hole and the second square hole, and the first square hole limits the circumferential direction of the first square block, and the second square hole limits the circumferential direction of the second square block.

[0009] The inner locking structure includes a middle hinge shaft, a lock tongue and a lock plate, the lock tongue is arranged in the lower door body, the lock plate is movably arranged on the lower door body, and the first square block and the second square hole are arranged at both ends of the middle hinge shaft;

[0010] The lock piece is connected to the lock tongue, and the lock tongue is connected to the middle hinge shaft. The lock tongue is driven to move by the lock piece, and the middle hinge shaft is driven to move by the lock tongue, so that the corresponding first square block and second square block are inserted into or away from the first square hole and the second square hole.

[0011] The middle hinge shaft includes a middle part, and the diameter of the middle part is larger than the side lengths of the first square block and the second square block;

[0012] The first square block and the second square block are respectively arranged at both ends of the middle hinge shaft. The first square block is connected to the middle part, and the second square block is arranged at an interval from the middle part. The side length of the second square block is larger than the diameter of the part between the second square block and the middle part.

[0013] A first lock hole is provided on the lower end surface of the upper door body. A first cylindrical hole, a first square hole and a second cylindrical hole are sequentially arranged in the first lock hole. The first cylindrical hole is provided on the lower end surface of the upper door body; the side length of the first square hole is smaller than the diameter of the first cylindrical hole, and the side length of the first square hole is larger than the diameter of the second cylindrical hole;

[0014] A guiding cylinder extends from the first square block, and the guiding cylinder is inserted into the second cylindrical hole; when the upper door body and the lower door body are in an unlocked state, the first square block is located in the first cylindrical hole.

[0015] A through second lock hole is provided on the upper end surface of the lower door body. A third cylindrical hole, a second square hole and a fourth cylindrical hole are sequentially arranged in the second lock hole. The third cylindrical hole is located on the upper end surface of the lower door body; the fourth cylindrical hole is a through hole, and the lock tongue is connected to the middle hinge shaft through the fourth cylindrical hole;

[0016] The side length of the second square block is smaller than that of the fourth cylindrical hole. When the upper door body and the lower door body are in an unlocked state, the second square block is located in the fourth cylindrical hole.

[0017] The refrigerator door further includes a fixing plate. A shaft hole is provided on the fixing plate, and the middle hinge shaft passes through the shaft hole. The fixing plate is located between the upper door body and the lower door body.

[0018] The upper door body includes a first door body and a second door body. The first door body and the second door body are detachably connected. A first cylinder is provided on the second door body, and the first lock hole is provided on the first cylinder.

[0019] The lower door body includes a third door body and a fourth door body. The third door body and the fourth door body are detachably connected; a second cylinder is provided on the fourth door body, and the second lock hole is provided on the second cylinder.

[0020] A slide rail is provided on the upper door body, and the lock piece is movably arranged on the slide rail.

[0021] A refrigerator includes: a box body and the refrigerator door with an internal lock as described in any one of the above. The upper door body is installed on the upper part of the box body, and the lower door body is installed on the lower part of the box body.

[0022] The beneficial effects of the present invention are as follows: A first square hole is opened on the lower end surface of the upper door body, a second square hole is opened on the upper end of the lower door body, and a first square block and a second square block are arranged on the internal lock structure; by driving the internal lock structure to move upward, the first square block and the second square block are correspondingly inserted into the first square hole and the second square hole. Since the first square hole, the second square hole, the first square block and the second square block are all square structures, after they are connected in cooperation with each other, the first square hole and the second square hole correspondingly limit the rotation of the first square block and the second square block on the circumferential square, so as to correspondingly limit the rotation of the upper door body and the lower door body, so as to realize the locking function of the upper door body and the lower door body. On the contrary, driving the internal lock structure to move downward can make the first square block and the second square block correspondingly disengage from the first square hole and the second square hole, so as to realize the unlocking of the upper door body and the lower door body. Description of the Drawings

[0023] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 is a schematic structural diagram of the prior art;

[0025] Figure 2 is an assembly drawing of the refrigerator door with an internal lock according to the present invention;

[0026] Figure 3 is a structural diagram of the refrigerator door with an internal lock according to the present invention;

[0027] Figure 4 is a sectional structural diagram of the refrigerator door with an internal lock according to the present invention;

[0028] Figure 5 is an enlarged sectional view of the refrigerator door in the unlocked state according to the present invention;

[0029] Figure 6 is an enlarged sectional view of the refrigerator door in the locked state according to the present invention;

[0030] Figure 7 is a structural diagram of the third door body and the fourth door body according to the present invention;

[0031] Figure 8 is an assembly drawing of the third door body and the fourth door body according to the present invention;

[0032] Figure 9 is a partially enlarged view of the third door body according to the present invention;

[0033] Figure 10 is a partially enlarged view of the fourth door body according to the present invention;

[0034] Figure 11 is the internal lock structure diagram of the present invention;

[0035] Figure 12 is the assembly diagram of the internal lock structure of the present invention;

[0036] Figure 13 is the assembly diagram of the straight edge of the hinge shaft and the shaft hole of the fixing plate in the present invention;

[0037] Figure 14 is the sectional view of the assembly of the hinge shaft and the fixing plate in the present invention;

[0038] Figure 15 is the refrigerator structure diagram for installing the refrigerator door of the present application in the present invention.

[0039] Among them, the reference numerals are: 100 - box body, 200 - box door, 300 - socket, 400 - latch;

[0040] 1 - upper door body, 101 - first door body, 102 - second door body, 103 - first cylinder, 104 - first lock hole, 105 - first cylindrical hole, 106 - first square hole, 107 - second cylindrical hole;

[0041] 2 - lower door body, 201 - third door body, 202 - fourth door body, 203 - second cylinder, 204 - second lock hole, 205 - third cylindrical hole, 206 - second square hole, 207 - fourth cylindrical hole,

[0042] 3 - internal lock structure, 301 - middle hinge shaft, 302 - lock tongue, 303 - lock piece, 304 - middle part, 305 - first square block, 306 - second square block, 307 - guiding cylinder, 308 - fixing plate, 309 - straight edge, 310 - notch. Detailed implementation manners

[0043] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Existing refrigerator locks are basically externally mounted on the refrigerator. Refer to Figure 1, a socket 300 is provided on the box body 100, and a buckle 400 is provided on the box door 200. The buckle 400 of the box door 200 is inserted into the socket 300 of the box body 100, so as to realize the locking of the box body 100 and the box door 200 of the refrigerator. This external setting method of the refrigerator lock makes the appearance of the refrigerator not concise enough. In addition, this external refrigerator lock is a convex structure, and there may be a possibility of collision with the human body, and the convex structure is more likely to cause harm to the human body compared with the flat structure.

[0045] In addition, this external refrigerator lock can only lock one door body. If it is necessary to lock both the upper door body 1 and the lower door body 2 of the refrigerator, two refrigerator locks need to be installed. This further makes the appearance of the refrigerator not concise enough, and the setting of two refrigerator locks also makes the cost higher.

[0046] Based on the above, referring to Figures 2 to 6 , the present invention provides a refrigerator door with an internal lock, including: an upper door body 1, a lower door body 2 and an internal lock structure 3. One end of the internal lock structure 3 is connected to the upper door body 1, and the other end is connected to the lower door body 2.

[0047] An internal first square hole 106 is opened on the lower end surface of the upper door body 1, and an internal second square hole 206 is opened on the upper end surface of the lower door body 2 (taking Figure 3 the up and down as the reference), a first square block 305 is provided on the internal lock structure 3, and a second square block 306 is further provided at one end of the internal lock structure 3 far from the first square block 305.

[0048] When the upper door body 1 and the lower door body 2 are in the unlocked state, referring to Figure 5 , the first square block 305 is far from the first square hole 106, and the second square block 306 is far from the second square hole 206. When the upper door body 1 and the lower door body 2 are in the locked state, referring to Figure 6 , the first square block 305 and the second square block 306 are correspondingly inserted into the first square hole 106 and the second square hole 206, and the first square hole 106 limits the circumferential direction of the first square block 305, and the second square hole 206 limits the circumferential direction of the second square block 306.

[0049] Specifically, referring to Figure 5 、 Figure 6 and Figure 8, at the upper and lower ends of the internal lock structure 3, a first square block 305 and a second square block 306 are correspondingly arranged. The first square block 305 is aligned with the first square hole 106, and the second square block 306 is aligned with the second square hole 206. When the upper door body 1 and the lower door body 2 are not locked, the first square block 305 does not contact the first square hole 106, and the second square block 306 does not contact the second square hole 206. The first square block 305 is located below the second square hole 206, and the second square block 306 is located below the second square hole 206. By driving the internal lock structure 3 to move upward, the first square block 305 and the second square block 306 are correspondingly inserted into the first square hole 106 and the second square hole 206. Since the first square hole 106, the second square hole 206, the first square block 305, and the second square block 306 are all square structures, when the square block structure is matched with the hole structure, the first square hole 106 plays a limiting role in the rotation of the first square block 305 on the circumferential square, and the second square hole 206 plays a limiting role in the rotation of the second square block 306 on the circumferential square, so that the internal lock structure 3 cannot rotate in the circumferential direction. And the first square hole 106 and the first square block are located on the upper door body 1 at 305, and the second square hole 206 and the second square block 306 are located on the lower door body 2, so that the upper door body 1 and the lower door body 2 cannot rotate, thereby realizing the locking function of the upper door body 1 and the lower door body 2.

[0050] Conversely, drive the internal lock structure 3 to move downward, so that the first square block 305 and the second square block 306 are correspondingly separated from the first square hole 106 and the second square hole 206. After the internal lock structure 3 has no limiting effect of the first square hole 106 and the second square hole 206, the upper door body 1 and the lower door body 2 can be rotated to open and close, thereby realizing the unlocking of the upper door body 1 and the lower door body 2.

[0051] It should be noted that the refrigerator door of the present application can be used on a refrigerator, but is not limited to being used only on a refrigerator. Any product that needs to install a door body structure and to which the refrigerator door of the present application is applicable can be installed with the refrigerator door of the present application.

[0052] In some embodiments, referring to Figure 5 , Figure 6 , Figure 10 and Figure 11 , the internal lock structure 3 includes a middle hinge shaft 301, a locking tongue 302, and a locking piece 303. A locking piece hole is provided on the lower door body 2, and the locking piece 303 is installed at the locking piece hole. The locking tongue 302 is arranged inside the lower door body 2. The locking piece 303 is connected to the locking tongue 302 through the locking piece hole, and the locking tongue 302 is connected to the middle hinge shaft 301. By moving upward (taking Figure 5Based on the upper and lower parts of [[ID=]], push the lock piece 303, so that the lock piece 303 pushes the lock tongue 302 to move upward. The upward-moving lock tongue 302 pushes the middle hinge shaft 301 to move. The upward movement of the middle hinge shaft 301 causes the first square block 305 and the second square block 306 to be correspondingly inserted into the first square hole 106 and the second square hole 206, completing the locking of the upper door body 1 and the lower door body 2. At this time, the upper door body 1 and the lower door body 2 cannot be opened. On the contrary, pull the lock piece 303 downward. The lock piece 303 drives the lock tongue 302 to move downward. Furthermore, the lock tongue 302 drives the middle hinge shaft 301 to move downward, causing the first square block 305 and the second square block 306 to correspondingly disengage from the first square hole 106 and the second square hole 206, completing the unlocking of the upper door body 1 and the lower door body 2. At this time, the upper door body 1 and the lower door body 2 can be opened or closed.

[0053] In some embodiments, specifically referring to Figure 10 and Figure 11 , the middle hinge shaft 301 includes an intermediate portion 304, and the diameter of the intermediate portion 304 is greater than the side lengths of the first square block 305 and the second square block 306. Herein, the intermediate portion 304 refers to the portion between the two ends of the middle hinge shaft 301, rather than the symmetric middle of the middle hinge shaft 301.

[0054] The first square block 305 and the second square block 306 are respectively arranged at both ends of the middle hinge shaft 301. And the first square block 305 is directly connected to the intermediate portion 304, and the second square block 306 is arranged at an interval from the intermediate portion 304. The side length of the second square block 306 is greater than the diameter of the portion between the second square block 306 and the intermediate portion 304.

[0055] In the state where the upper door body 1 and the lower door body 2 are not locked, referring to Figure 5 , the first square block 305 is away from the first square hole 106 and is aligned with the first square block 305; the portion between the second square block 306 and the intermediate portion 4 is located in the second square hole 206. When the inner lock structure 3 is pushed, referring to Figure 6 , the first square block 305 is moved into the first square hole 106, and the second square block 306 moves toward the upper door body 1 side, so that the second square block 306 is located in the second square hole 206, completing the locking of the upper door body 1 and the lower door body 2.

[0056] In some embodiments, referring to Figures 7 to 9, a first lock hole 104 is provided on the lower end surface of the upper door body 1, that is, on the lower end surface of the upper door body 1, a first lock hole 104 with a certain depth is provided in a direction away from the lower door body 2. The first square hole 106 is located within the first lock hole 104. A first cylindrical hole 105 is provided on one side of the first square hole 106, and a second cylindrical hole 107 is provided on the other side of the first square hole 106. That is, a first cylindrical hole 105, a first square hole 106, and a second cylindrical hole 107 are successively provided within the first lock hole 104, wherein the first cylindrical hole 105 is located on the lower end surface of the upper door body 1.

[0057] The side length of the first square hole 106 is smaller than the diameter of the first cylindrical hole 105, and the side length of the first square hole 106 is larger than the diameter of the second cylindrical hole 107. To cooperate with the structure provided within the first lock hole 104, a guiding cylinder 307 is extended and provided on the first square block 305. When the upper door body 1 is in an unlocked state, the first square block 305 is located within the first cylindrical hole 105, while the guiding cylinder 307 is always inserted within the second cylindrical hole 107. The guiding cylinder 307 provides guidance for the first square block 305 to insert into the first square hole 106. When it is necessary to lock the upper door body 1, the first square block 305 is inserted from the first cylindrical hole 105 into the first square hole 106 to complete the locking of the upper door body 1.

[0058] In some embodiments, referring to Figure 7 , Figure 8 and Figure 10 , a through second lock hole 204 is provided on the upper end surface of the lower door body 2, that is, on the upper end surface of the lower door body 2, a second lock hole 204 with a certain depth is provided in a direction away from the upper door body 1. The second square hole 206 is located within the second lock hole 204. A third cylindrical hole 205 and a fourth cylindrical hole 207 are also provided within the second lock hole 204, wherein the second square block 306 is located between the third cylindrical hole 205 and the fourth cylindrical hole 207. That is, a third cylindrical hole 205, a second square hole 206, and a fourth cylindrical hole 207 are successively provided within the second lock hole 204, wherein the third cylindrical hole 205 is located on the upper end surface of the lower door body 2, and the fourth cylindrical hole 207 is a through hole. The lock tongue 302 is connected to the middle hinge shaft 301 through the fourth cylindrical hole 207.

[0059] The side length of the second square block 306 is smaller than the fourth cylindrical hole 207. When the upper door body 1 and the lower door body 2 are in an unlocked state, the second square block 306 is located within the fourth cylindrical hole 207. When it is necessary to lock the upper door body 1 and the lower door body 2, the internal lock structure is pushed, such that the first square block 305 moves from the first cylindrical hole 105 into the first square hole 106, and the second square block 306 moves from the fourth cylindrical hole 207 into the second square hole 206 to complete the locking of the upper door body 1 and the lower door body 2.

[0060] In some embodiments, referring to Figure 11 and Figure 12 , the refrigerator door further includes a fixing plate 308. A shaft hole is provided on the fixing plate 308, and the middle hinge shaft 301 passes through the shaft hole. The fixing plate 308 is located between the upper door body 1 and the lower door body 2. When the upper door body 1 and the lower door body 2 are in a locked state, when the upper door body 1 is opened or closed, the upper door body 1 rotates on the fixing plate 308; similarly, when the lower door body 2 is opened or closed, the lower door body 2 rotates on the fixing plate 308. The fixing plate 308 spaces the upper door body 1 and the lower door body 2 apart, so that the upper door body 1 and the lower door body 2 do not directly contact at the inner lock structure 3. The rotation of both is in contact and sliding with the fixing plate 308, avoiding the direct relative contact and sliding between the upper door body 1 and the lower door body 2. Sliding along the fixing plate 308 can ensure that the sliding between the upper door body 1 and the lower door body 2 is more stable.

[0061] Furthermore, referring to Figure 11 , Figure 13 and Figure 14 , a straight edge 309 is provided in the shaft hole on the fixing plate 308, and a notch 310 is formed in the middle part 304 of the middle hinge shaft 301. When the middle hinge shaft 301 passes through the shaft hole on the fixing plate 308, the straight edge 309 of the shaft hole is aligned with the notch 310 on the middle part 304. The straight edge 309 and the notch 310 form a limiting structure. The straight edge 309 of the shaft hole can support and limit the middle hinge shaft 301, restricting the displacement distance of the middle hinge shaft 301 moving downward. At the same time, after the straight edge 309 of the shaft hole fits with the notch 310 on the middle hinge shaft 301, the rotation of both can be restricted, avoiding the middle hinge shaft 301 being driven to rotate when the upper door body 1 or the lower door body 2 rotates, and improving the stability of the inner lock structure 3.

[0062] In some embodiments, referring to Figure 3 , Figure 4 , Figure 7 and Figure 8 , the upper door body 1 includes a first door body 101 and a second door body 102. The upper door body 1 is provided with a cavity. The first door body 101 and the second door body 102 are detachably connected. After the first door body 101 and the second door body 102 are assembled, a cavity is formed inside. A first cylinder 103 is provided on the second door body 102, and a first lock hole 104 is provided inside the first cylinder 103. The detachable setting of the first door body 101 and the second door body 102 facilitates the assembly of the upper door body 1. A cavity is provided inside the upper door body 1, and this cavity can be used to install other internal components.

[0063] In some embodiments, Figure 3 , Figure 4 , Figure 7 and Figure 8, the lower door body 2 includes a third door body 201 and a fourth door body 202, and the third door body 201 and the fourth door body 202 are detachably connected. The inside of the lower door body 2 is provided with a cavity. The fourth door body 202 is installed on the third door body 201, and a second cylinder 203 is provided on the fourth door body 202, and a second lock hole 204 is provided on the second cylinder 203. The detachable setting of the third door body 201 and the fourth door body 202 facilitates the assembly of the upper door body 1. A cavity is provided inside the upper door body 1, and this cavity can be used to install other internal components.

[0064] In some embodiments, a slide rail is provided on the upper door body 1, and the lock piece 303 is movably arranged on the slide rail (not shown in the figure). By pushing the lock piece 303 to move towards the upper door body 1 side on the slide rail, the lock tongue 302 is driven to move towards the upper door body 1 side. The lock tongue 302 pushes the middle hinge shaft 301 to move towards the upper door body 1 side, so that the first square block 305 is inserted into the first square hole 106, and the second square block 306 is inserted into the second square hole 206 to complete the locking of the upper door body 1 and the lower door body 2. Conversely, pushing the lock piece 303 to move back (towards the lower door body 2 side) on the slide rail drives the lock tongue 302 to pull the middle hinge shaft 301 to move towards the lower door body 2 side, so that the first square block 305 and the second square block 306 are correspondingly disengaged from the first square hole 106 and the second square hole 206.

[0065] Furthermore, referring to Figure 11 , a cylinder is provided on the lock tongue 302, and a hole is provided on the cylinder. A cylinder is provided on one side of the lock piece 303. The connection between the lock piece 303 and the lock tongue 302 is realized by inserting the cylinder on the lock piece 303 into the hole on the cylinder of the lock tongue 302.

[0066] Furthermore, both the first square hole 106 and the second square hole 206 are square holes, and the first square block 305 and the second square block 306 are correspondingly configured as squares to fit the first square hole 106 and the second square hole 206.

[0067] Referring to Figure 15 , the present invention provides a refrigerator, including: a box body and a refrigerator door with a built-in lock as described in any one of the above. The refrigerator door is installed on the box body. Among them, the upper door body 1 is installed on the upper part of the box body, and the lower door body 2 is installed on the lower part of the box body.

[0068] By providing the above-mentioned refrigerator door on the refrigerator, the refrigerator of the present application can lock the refrigerator lock inside the refrigerator, so as to simplify the external structure of the refrigerator of the present application compared with the existing refrigerator lock structure.

[0069] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A refrigerator door with a built-in lock, characterized in that, Comprising: An upper door body, a lower door body and an internal locking structure, one end of the internal locking structure is connected to the upper door body, and the other end is connected to the lower door body; A first square hole is provided on the lower end surface of the upper door body, a second square hole is provided on the upper end surface of the lower door body, a first square block is provided on the internal locking structure, and a second square block is further provided at one end of the internal locking structure away from the first square block; When the upper door body and the lower door body are in an unlocked state, the first square block is away from the first square hole, and the second square block is away from the second square hole; when the upper door body and the lower door body are in a locked state, the first square block and the second square block are correspondingly inserted into the first square hole and the second square hole, and the first square hole limits the circumferential direction of the first square block, and the second square hole limits the circumferential direction of the second square block; The internal locking structure includes a middle hinge shaft, a locking tongue and a locking piece, the locking tongue is arranged in the lower door body, and the locking piece is movably arranged on the lower door body; The middle hinge shaft includes a middle part, and the diameter of the middle part is larger than the side lengths of the first square block and the second square block; The first square block and the second square block are respectively arranged at both ends of the middle hinge shaft, the first square block is connected to the middle part, the second square block is arranged at an interval from the middle part, and the side length of the second square block is larger than the diameter of the part between the second square block and the middle part; A first lock hole is provided on the lower end surface of the upper door body, a first cylindrical hole, the first square hole and a second cylindrical hole are sequentially arranged in the first lock hole, and the first cylindrical hole is provided on the lower end surface of the upper door body; the side length of the first square hole is smaller than the diameter of the first cylindrical hole, and the side length of the first square hole is larger than the diameter of the second cylindrical hole; A guiding cylinder extends from the first square block, and the guiding cylinder is inserted into the second cylindrical hole; when the upper door body and the lower door body are in an unlocked state, the first square block is located in the first cylindrical hole; A through second lock hole is provided on the upper end surface of the lower door body, a third cylindrical hole, the second square hole and a fourth cylindrical hole are sequentially arranged in the second lock hole, and the third cylindrical hole is located on the upper end surface of the lower door body; the fourth cylindrical hole is a through hole, and the locking tongue is connected to the middle hinge shaft through the fourth cylindrical hole; The side length of the second square block is smaller than the fourth cylindrical hole, and when the upper door body and the lower door body are in an unlocked state, the second square block is located in the fourth cylindrical hole.

2. The refrigerator door with a built-in lock according to claim 1, characterized in that, The locking piece is connected to the locking tongue, the locking tongue is connected to the middle hinge shaft, the locking tongue is driven to move by the locking piece, and the middle hinge shaft is driven to move by the locking tongue, so that the first square block and the second square block are correspondingly inserted into or away from the first square hole and the second square hole.

3. The refrigerator door with a built-in lock according to claim 1, characterized in that, The refrigerator door further includes a fixing plate, a shaft hole is provided on the fixing plate, the middle hinge shaft passes through the shaft hole, and the fixing plate is located between the upper door body and the lower door body.

4. The refrigerator door with a built-in lock according to claim 3, characterized in that, The upper door body includes a first door body and a second door body. The first door body and the second door body are detachably connected. A first cylinder is provided on the second door body, and the first lock hole is provided on the first cylinder.

5. The refrigerator door with a built-in lock according to claim 4, characterized in that, The lower door body includes a third door body and a fourth door body. The third door body and the fourth door body are detachably connected. A second cylinder is provided on the fourth door body, and the second lock hole is provided on the second cylinder.

6. The refrigerator door with a built-in lock according to any one of claims 2-5, characterized in that, A slide rail is provided on the upper door body, and the lock piece is movably arranged on the slide rail.

7. A refrigerator, characterized in that, Comprising: A box body and a refrigerator door with a built-in lock according to any one of claims 1 to 6. The upper door body is installed on the upper part of the box body, and the lower door body is installed on the lower part of the box body.

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