CN114251901A

CN114251901A - A kind of refrigerator

Info

Publication number: CN114251901A
Application number: CN202011016442.7A
Authority: CN
Inventors: 张海鹏; 潘毅广; 孙敬龙; 丁龙辉; 齐聪山
Original assignee: Hisense Shandong Refrigerator Co Ltd
Current assignee: Hisense Shandong Refrigerator Co Ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2022-03-29
Anticipated expiration: 2040-09-24
Also published as: CN114251901B

Abstract

The invention discloses a refrigerator, relates to the technical field of storage equipment, and aims to solve the problems that in the prior art, external hot air is easy to enter a storage chamber through a drain pipe, the storage temperature is influenced, and the power consumption of the refrigerator is increased. The refrigerator comprises a shell, wherein a water outlet is formed in the shell; the top end of the drain pipe is communicated with the water outlet, and the bottom end of the drain pipe extends into the container for collecting the defrosting water; the ventilation pipe is arranged inside the water drainage pipe, the bottom end of the ventilation pipe is closed, the outer wall of the ventilation pipe is fixedly connected with the inner wall of the water drainage pipe through a connecting part, vent holes are formed in the connecting part along the radial direction of the ventilation pipe, the vent holes penetrate through the water drainage pipe and the pipe wall of the ventilation pipe, a water drainage channel is formed between the inner wall of the water drainage pipe and the outer wall of the ventilation pipe and is used for communicating a water drainage port with the container; the one-way valve is arranged at the top end of the ventilation pipe and enables air to circulate from bottom to top. The invention is used for storing food.

Description

A kind of refrigerator

Technical Field

The invention relates to the technical field of storage equipment, in particular to a refrigerator.

Background

The refrigerator is an indispensable electric appliance in daily life of people. The mainstream refrigerator that uses now is air-cooled refrigerator, including the door body and box, and the box includes the inside inner bag of shell and shell, and the inside storeroom that forms the refrigerator of inner bag still is provided with the wind channel apron in the inner bag, forms the wind channel between the back wall of wind channel apron and inner bag, is provided with evaporimeter and fan in the wind channel, is provided with the heater strip that is used for heating defrosting on the evaporimeter.

The air-cooled refrigerator utilizes air circulation to refrigerate, when high-temperature air flows through the evaporator in the air channel, the air temperature is high, the temperature of the evaporator is low, and therefore the air temperature and the evaporator exchange heat, the temperature of the air is reduced, then the cold air is blown into the storage chamber of the refrigerator through the fan, and the temperature in the storage chamber of the refrigerator is reduced through continuous air circulation. Because there is vapor in the air, when vapor's temperature reduced, vapor can condense, leads to frosting on the evaporimeter, consequently, when frosting on the evaporimeter, the accessible heater strip heating makes the frost on the evaporimeter melt, and the defrosting rivers after melting are to wind channel bottom to in the drain pipe through the inner bag below flows in the container of shell bottom, thereby accomplish the defrosting of evaporimeter.

After the refrigerator closes the door body, a closed space can be formed inside the inner container, and a certain negative pressure can be formed inside the inner container at the moment when the door body is closed or opened, so that the drain pipe is the only part capable of balancing the air pressure inside and outside the inner container, external air can be sucked through the drain pipe, and the air pressure inside and outside the inner container is balanced.

To above-mentioned problem, prior art is through seting up the through-hole on the lateral wall of drain pipe, when the inside negative pressure that produces of inner bag, the drain pipe can be through this through-hole suction outside air to balanced inside negative pressure avoids the water in the container to be adsorbed in the drain pipe, thereby eliminates the noise of absorbing water. However, after the through hole is formed in the side wall of the drain pipe, when the refrigerator works normally, external hot air can enter the drain pipe through the through hole and then enter the inner container, so that the storage temperature in the inner container is increased, the power consumption of the refrigerator is increased, and the preservation effect of the refrigerator is influenced.

Disclosure of Invention

The embodiment of the invention provides a refrigerator, which can prevent external hot air from entering the interior of a refrigerator body when the refrigerator works normally, avoid the temperature rise of the interior of the refrigerator body and slow down the frosting of an evaporator, thereby reducing the power consumption of the refrigerator and ensuring the fresh-keeping effect of the refrigerator.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

an embodiment of the present invention provides a refrigerator, including:

the water outlet is formed in the shell;

the top end of the drain pipe is communicated with the water outlet, and the bottom end of the drain pipe extends into a container for collecting defrosting water;

the ventilation pipe is arranged inside the water drainage pipe, the bottom end of the ventilation pipe is closed, the outer wall of the ventilation pipe is fixedly connected with the inner wall of the water drainage pipe through a connecting part, vent holes are formed in the connecting part along the radial direction of the ventilation pipe, the vent holes penetrate through the water drainage pipe and the pipe wall of the ventilation pipe, a water drainage channel is formed between the inner wall of the water drainage pipe and the outer wall of the ventilation pipe and is used for communicating the water drainage port with the container;

the one-way valve is arranged at the top end of the ventilation pipe and enables air to circulate from bottom to top.

The refrigerator provided by the embodiment of the invention has the advantages that the vent pipe with the closed bottom end is arranged in the drain pipe, the vent pipe and the drain pipe are fixedly connected through the connecting part, the vent hole is formed in the connecting part, so that the vent pipe is communicated with the outside through the vent hole in the connecting part, then the one-way valve is arranged at the top of the vent pipe, air can enter the drain pipe through the one-way valve, the drain passage is arranged between the inner wall of the drain pipe and the outer wall of the vent pipe, defrosting water in the shell can flow to the lower end of the drain pipe through the drain passage and flow into the container for collecting the defrosting water, so that negative pressure generated in the shell is balanced through the vent hole, the defrosting water is discharged through the drain passage, the one-way valve is arranged at the top end of the vent pipe, when negative pressure is generated in the refrigerator, the one-way valve is opened under the pressure effect, so that the external air enters the drain pipe, and get into the shell inside to can balance the inside negative pressure of refrigerator, after the inside negative pressure balance of refrigerator, because the pressure differential between inside and outside refrigerator disappears, so the check valve closes, avoids inside external hot-air gets into the shell, thereby can avoid the inside temperature rise of refrigerator, can not influence the storage temperature and the consumption of refrigerator, is favorable to guaranteeing the fresh-keeping effect of refrigerator.

In some embodiments of the invention, the connecting part is a connecting block, and the connecting block is fixedly connected with the inner wall of the drain pipe and the outer wall of the ventilation pipe.

In some embodiments of the invention, the connecting blocks are provided in plurality and uniformly distributed around the circumferential direction of the ventilation pipe, and the drainage channel is formed between every two adjacent connecting blocks.

In some embodiments of the invention, each connecting block is provided with the vent hole.

In some embodiments of the present invention, the check valve is a duckbill valve, and the duckbill valve sleeve is disposed at the top end of the vent pipe and is in interference fit with the vent pipe.

In some embodiments of the present invention, the drain pipe includes an upper pipe and a lower pipe which are communicated with each other, the vent pipe is disposed at an upper end inside the lower pipe, and a lower end of the upper pipe is inserted between the lower pipe and the vent pipe.

In some embodiments of the invention, the upper tube and the lower tube are in an interference fit.

In some embodiments of the present invention, the lower end of the upper tube is of a throat structure, the inner diameter of the lower end nozzle of the upper tube is larger than the outer diameter of the ventilation tube, and the outer diameter of the lower end nozzle of the upper tube is smaller than the inner diameter of the top nozzle of the lower tube.

In some embodiments of the invention, one of the outer wall of the upper pipe and the inner wall of the lower pipe is provided with a protrusion, the other is provided with a clamping groove, and the upper pipe and the lower pipe are clamped through the protrusion and the clamping groove.

In some embodiments of the present invention, the clamping groove includes a vertical section disposed along an axial direction of the lower pipe and a horizontal section disposed along a circumferential direction of the lower pipe, one end of the vertical section is communicated with the horizontal section, the other end of the vertical section penetrates through an upper end face of the lower pipe or a lower end face of the upper pipe, and the protrusion is installed from the vertical section and clamped in the horizontal section.

Drawings

Fig. 1 is a schematic view of an overall structure of a refrigerator according to an embodiment of the present invention;

fig. 2 is a schematic partial sectional structure view of a refrigerator according to an embodiment of the present invention;

FIG. 3 is a schematic view of the overall structure of a drain pipe according to an embodiment of the present invention;

FIG. 4 is a schematic view of a first angled partial cross-section of a drain pipe according to an embodiment of the present invention;

FIG. 5 is a schematic view of a second angle partial cross-section of a drain pipe according to an embodiment of the present invention;

FIG. 6 is a schematic view of an overall structure of a lower pipe according to an embodiment of the present invention;

FIG. 7 is a top view of a down tube provided in accordance with an embodiment of the present invention;

FIG. 8 is a schematic view of a first angled partial cross-section of a downtube according to an embodiment of the present invention;

FIG. 9 is a second angle partial cross-sectional view of a lower tube according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a third angle partial cross-sectional structure of a lower tube according to an embodiment of the present invention.

Reference numerals: 100. a box body; 101. a storage chamber; 101A, a freezing chamber; 101B, a refrigerating chamber; 110. a housing; 111. an accommodating chamber; 112. a water outlet; 120. an inner container; 121. an air duct cover plate; 200. a door body; 200A; a freezing chamber door; 200B, a refrigerating chamber door; 300. a drain pipe; 310. feeding a pipe; 320. a lower pipe; 400. a vent pipe; 500. connecting blocks; 510. a vent hole; 520. a drainage channel; 600. a one-way valve; 700. a container.

Detailed Description

A refrigerator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 is a perspective view of an embodiment of a refrigerator according to the present invention, which has an approximately rectangular parallelepiped shape. The appearance of the refrigerator is defined by a storage chamber 101 defining a storage space, the storage chamber 101 being a cabinet 100 having an opening, and a plurality of door bodies 200 provided in the storage chamber 101, the storage chamber 101 being vertically partitioned into a lower freezing chamber 101A and an upper refrigerating chamber 101B. Each of the partitioned spaces may have an independent storage space.

In detail, the freezing chamber 101A is defined at a lower side of the storage chamber 101 and may be selectively covered by a drawer type freezing chamber door 200A. The space defined above the freezing chamber 101A is partitioned into left and right sides to define the refrigerating chamber 101B, respectively. The refrigerating compartment 101B is selectively opened or closed by a refrigerating compartment door 200B pivotably mounted on the refrigerating compartment 101B.

As shown in fig. 2, the cabinet 100 according to an embodiment of the present invention includes an outer casing 110 and an inner container 120 disposed inside the outer casing 110, the inner container 120 forms the storage chamber 101, an air duct cover 121 is disposed inside the inner container 120, a circulating air duct is formed between the air duct cover 121 and a rear wall of the inner container 120, an evaporator (not shown) is disposed in the circulating air duct, a receiving cavity 111 is formed by inward recessing a lower end of the rear wall of the outer casing 110, a water outlet 112 is disposed on a top surface of the receiving cavity 111, a container 700 (e.g., an evaporation pan) for collecting defrosted water is disposed on a bottom surface of the receiving cavity 111, a water drain pipe 300 is further disposed in the receiving cavity 111, a top end of the water drain pipe 300 is communicated with the water outlet 112, a bottom end of the water drain pipe extends into the container 700, when the evaporator in the circulating air duct defrosted water flows to a bottom end of the circulating air duct and enters the water drain pipe 300 through the water outlet 112, and then flows into the container 700, so that the defrosted water inside the case 100 can be collected.

As shown in fig. 3 and 4, a ventilation pipe 400 is further disposed in the drainage pipe 300 according to an embodiment of the present invention, the bottom end of the ventilation pipe 400 is closed, the outer wall of the ventilation pipe 400 is fixedly connected with the inner wall of the drainage pipe 300 through a connecting portion, a vent hole 510 is disposed in the connecting portion along the radial direction of the ventilation pipe 400, the vent hole 510 penetrates through the drainage pipe 300 and the pipe wall of the ventilation pipe 400, as shown in fig. 5, a drainage channel 520 is formed between the inner wall of the drainage pipe 300 and the outer wall of the ventilation pipe 400, the drainage channel 520 is used for communicating the drainage port 112 with the container 700, a one-way valve 600 is disposed at the top end of the ventilation pipe 400, and air is circulated from bottom to top by the one-way valve 600.

The refrigerator provided by the embodiment of the invention is characterized in that the vent pipe 400 with the closed bottom end is arranged in the drain pipe 300 and fixedly connected with the drain pipe 300 through the connecting part, the connecting part is provided with the vent hole, so that the vent pipe 400 is communicated with the outside through the vent hole on the connecting part, then the top of the vent pipe 400 is provided with the one-way valve 600, air can enter the drain pipe 300 through the one-way valve 600, the drainage channel 520 is arranged between the inner wall of the drain pipe 300 and the outer wall of the vent pipe 400, defrosting water in the shell 110 can flow to the lower end of the drain pipe 300 through the drainage channel 520 and flow into the container 700 for collecting the defrosting water, so that the negative pressure generated in the shell 110 is balanced through the vent hole, the defrosting water is discharged through the drainage channel 520, the one-way valve 600 is arranged at the top end of the vent pipe 400, when the negative pressure is generated in the refrigerator, the one-way valve 600 is opened under the pressure action, make in the outside air gets into drain pipe 300 to inside getting into shell 110, thereby can balance the inside negative pressure of refrigerator, after the negative pressure balance of refrigerator inside, because the inside and outside pressure differential of refrigerator disappears, consequently check valve 600 closes, avoids inside external hot-air admission shell 110, thereby can avoid the inside temperature rising of refrigerator, can not influence the storage temperature and the consumption of refrigerator, is favorable to guaranteeing the fresh-keeping effect of refrigerator.

As shown in fig. 2 and 3, the drain pipe 300 according to the embodiment of the present invention includes an upper pipe 310 and a lower pipe 320 that are communicated with each other, and as shown in fig. 4 and 5, a ventilation pipe 400 is disposed at an upper end of an inside of the lower pipe 320, a lower end of the upper pipe 310 is inserted between the lower pipe 320 and the ventilation pipe 400, a top end of the upper pipe 310 is communicated with the drain opening 112, and a bottom end of the lower pipe 320 is communicated with the container 700. By arranging the drain pipe 300 as the upper pipe 310 and the lower pipe 320 and arranging the vent pipe 400 at the upper end of the lower pipe 320, the lower pipe 320 can be conveniently processed and manufactured, the processing difficulty can be reduced, and the production cost can be reduced.

The connection portion provided in the embodiment of the present invention may be a connection block 500, as shown in fig. 6 and 8, the connection block 500 is fixedly connected to both the inner wall of the lower tube 320 and the outer wall of the ventilation tube 400, and as shown in fig. 7 and 9, the drainage channel 520 is formed between the inner wall of the lower tube 320 and the outer wall of the ventilation tube 400 around the circumferential direction of the ventilation tube 400 where the connection block 500 is not disposed. Since the annular gap is formed between the inner wall of the lower pipe 320 and the outer wall of the ventilation pipe 400, the region in the annular gap where the connecting block 500 is not disposed can form the drainage channel 520 which enables the upper pipe 310 and the lower pipe 320 to be communicated up and down, so that the defrosting water can flow into the container 700 at the bottom end of the lower pipe 320, and the drainage channel 520 and the vent 510 are not communicated with each other, thereby preventing air from entering the drain pipe 300 along the drainage channel 520, further preventing air from entering the interior of the cabinet 100, and avoiding affecting the storage temperature and power consumption of the refrigerator.

The connection part provided by the embodiment of the present invention may also be a connection pipe, both ends of the connection pipe are respectively fixedly connected to the inner wall of the lower pipe 320 and the outer wall of the ventilation pipe 400, and through holes communicated with the connection pipe are respectively formed on both the lower pipe 320 and the ventilation pipe 400, external air can enter the ventilation pipe 400 through the inside of the connection pipe, and further enter the inside of the box body 100 through the check valve 600, and a plurality of connection pipes may be provided, so that the air flow can be increased, and meanwhile, the plurality of connection pipes have intervals therebetween, and the drainage channel 520 may be formed through the intervals between the connection pipes, so that the defrosting water can flow into the container 700 at the lower end of the lower pipe 320.

In some embodiments, as shown in fig. 7 and 10, the connecting blocks 500 are provided in plurality and uniformly distributed around the circumference of the ventilation pipe 400, and the drainage channel 520 is formed between each two adjacent connecting blocks 500. Through the circumference evenly distributed with a plurality of connecting blocks 500 around ventilation pipe 400, can make the connection structure atress between lower pipe 320 and the ventilation pipe 400 more balanced, be favorable to improving overall structure and stable to all have the space between two adjacent connecting blocks 500, thereby can form a plurality of drainage channel 520, be favorable to changing in the frost water flows to container 700 fast, avoid forming ponding in the drain pipe 300.

In some embodiments, as shown in fig. 6, 8 and 10, each of the connection blocks 500 is provided with the vent 510. Through setting up a plurality of air vents 510, can increase gaseous flow, inside the entering box 100 that makes the air can be quick to can the quick balanced negative pressure, avoid producing the noise.

The check valve 600 provided by the embodiment of the invention can be check valves 600 with various structures, and in order to reduce the cost, as shown in fig. 4 and 5, the check valve 600 provided by the embodiment of the invention adopts a duckbill valve which is specially processed by elastic chloroprene rubber and artificial fiber and is similar to a duckbill in shape, so that the duckbill valve is called, under the condition of no internal pressure, the outlet of the duckbill valve is closed under the self elastic action, and when negative pressure is generated in the refrigerator, the pressure action is gradually increased at the outlet of the duckbill valve, so that external air can enter the refrigerator to balance the negative pressure. The duckbill valve has the advantages of no blockage, good sealing, long service life, convenient installation, low cost and the like, so that the duckbill valve can ensure good sealing performance and is favorable for reducing the cost.

In some embodiments, as shown in fig. 3, 4, and 5, an upper pipe 310 and a lower pipe 320 provided in the embodiments of the present invention are in an interference fit, and the upper pipe 310 and the lower pipe 320 are fixedly connected by the interference fit, so that other connecting components are not arranged between the upper pipe 310 and the lower pipe 320, and the structure is simpler and the installation is more convenient.

In some embodiments, as shown in fig. 3, 4 and 5, the lower end of the upper pipe 310 provided by the embodiments of the present invention is in a reduced structure, the inner diameter of the lower nozzle of the upper pipe 310 is greater than the outer diameter of the ventilation pipe 400, and the outer diameter of the lower nozzle of the upper pipe 310 is smaller than the inner diameter of the top nozzle of the lower pipe 320. Set up to the throat structure through the lower extreme with upper tube 310 to in being convenient for insert the upper end of low tube 320 with the lower extreme of upper tube 310, simultaneously, because the orificial internal diameter of lower extreme of upper tube 310 is greater than the external diameter of ventilation pipe 400, thereby when upper tube 310 inserts in low tube 320, upper tube 310 can overlap and locate on ventilation pipe 400, and upper tube 310 sets up between low tube 320 and ventilation pipe 400 promptly, and this throat structure makes the unit mount more convenient.

In some embodiments, as shown in fig. 3, 4, and 5, a protrusion is disposed on one of an outer wall of an upper tube 310 and an inner wall of a lower tube 320 provided in an embodiment of the present invention, and a locking groove is disposed on the other, and the upper tube 310 and the lower tube 320 are locked to each other by the protrusion and the locking groove. The upper pipe 310 and the lower pipe 320 are mutually clamped through the protrusions and the clamping grooves, a detachable structure can be formed, and the interior of the drain pipe 300 can be cleaned conveniently.

It should be noted that the protrusions and the locking grooves may be disposed around the circumference of the drain pipe 300 to form a ring structure, or may be disposed around the circumference of the drain pipe 300 in a plurality and uniformly distributed, and therefore, the specific number and shape of the protrusions and the locking grooves are not limited.

In some embodiments, as shown in fig. 3, 4, and 5, the card slot provided in the embodiments of the present invention includes a vertical section disposed along an axial direction of the lower tube 320 and a horizontal section disposed along a circumferential direction of the lower tube 320, one end of the vertical section is communicated with the horizontal section, the other end of the vertical section penetrates through an upper end surface of the lower tube 320 or a lower end surface of the upper tube 310, and the protrusion is installed by the vertical section and is clamped in the horizontal section. Through setting up the draw-in groove into vertical section and horizontal segment, thereby when the installation, with protruding along the terminal surface department of upper tube 310 or lower tube 320 in the vertical section of packing into, when the protruding other end that slides to vertical section, with upper tube 310 and lower tube 320 relative rotation can make protruding card go into in the horizontal segment, thereby can restrict along axial alternate segregation between upper tube 310 and the lower tube 320, when needs are dismantled, only need to rotate upper tube 310 and lower tube 320 to opposite direction relatively earlier, make protruding rotation to the crossing point department between vertical section and the horizontal segment, then with upper tube 310 and lower tube 320 to the direction removal of keeping away from each other, can make upper tube 310 and lower tube 320 alternate segregation, thereby be convenient for installation and dismantlement between upper tube 310 and the lower tube 320.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A refrigerator, characterized by comprising:

the water outlet is formed in the shell;

2. The refrigerator according to claim 1, wherein the connection part is a connection block, and the connection block is fixedly connected to both the inner wall of the drain pipe and the outer wall of the ventilation pipe.

3. The refrigerator according to claim 2, wherein the connecting blocks are provided in plurality and are uniformly distributed around the circumferential direction of the ventilation pipe, and the drain channel is formed between each two adjacent connecting blocks.

4. The refrigerator as claimed in claim 3, wherein each of the connection blocks is provided with the vent hole.

5. The refrigerator of any one of claims 1 to 4, wherein the check valve is a duckbill valve, and the duckbill valve sleeve is provided at a top end of the vent pipe and is in interference fit with the vent pipe.

6. The refrigerator as claimed in any one of claims 1 to 4, wherein the drain pipe includes an upper pipe and a lower pipe communicating with each other, the vent pipe is disposed at an upper end of an inside of the lower pipe, and a lower end of the upper pipe is interposed between the lower pipe and the vent pipe.

7. The refrigerator of claim 6, wherein the upper tube and the lower tube are in an interference fit.

8. The refrigerator as claimed in claim 7, wherein the lower end of the upper tube is of a throat structure, the lower end nozzle of the upper tube has an inner diameter greater than an outer diameter of the ventilation tube, and the lower end nozzle of the upper tube has an outer diameter smaller than an inner diameter of the top end nozzle of the lower tube.

9. The refrigerator as claimed in claim 6, wherein a protrusion is formed on one of the outer wall of the upper tube and the inner wall of the lower tube, and a locking groove is formed on the other, and the upper tube and the lower tube are locked to each other by the protrusion and the locking groove.

10. The refrigerator according to claim 9, wherein the locking groove includes a vertical section provided along an axial direction of the lower tube and a horizontal section provided along a circumferential direction of the lower tube, one end of the vertical section communicates with the horizontal section, the other end of the vertical section penetrates an upper end surface of the lower tube or a lower end surface of the upper tube, and the protrusion is fitted into the vertical section and locked in the horizontal section.