CN217696204U - Cooking utensil that culinary art effect is good - Google Patents

Abstract

The utility model discloses a cooking utensil with good cooking effect, which comprises a pot body, wherein the pot body comprises a heat preservation cover, a heating plate and a centrifugal fan, the heating plate and the centrifugal fan are arranged in the heat preservation cover, and the centrifugal fan is positioned below the heating plate; the air-frying inner container is arranged in the heat-insulating cover and is positioned above the heating plate; the cooking utensil still includes air intake and the first air outlet that is used for forming the circulation air current, the air intake with the cover intercommunication that keeps warm, first air outlet sets up keep warm and cover last, the end of generating heat the dish is followed the lower surface and is less than the upper end of first air outlet is followed and is higher than the lower extreme of first air outlet is followed. The utility model discloses can make centrifugal fan release some heating air current that carries oil smoke or steam from first air outlet to supply external new trend through the air intake, form the circulation distinguished and admirable, avoid appearing oil smoke or steam and gather the condition in the culinary art chamber, improve the effect of culinary art.

Description

Cooking utensil that culinary art effect is good

Technical Field

The utility model belongs to the technical field of food processing, a cooking utensil that culinary art effect is good is related to.

Background

A heating plate and a fan are arranged in a heat-insulating cover of a pot body, and high-temperature airflow for cooking food is generated by the heating plate and the fan. However, because the air outlet of the cooking appliance is designed unreasonably, oil smoke, water vapor and the like generated in the cooking process are easy to accumulate in the cooking cavity, the cooking effect is affected, and the use experience of a user is reduced.

Disclosure of Invention

The utility model discloses problem to prior art existence provides a cooking utensil that culinary art effect is good, and aim at overcomes current cooking utensil air outlet position design unreasonable defect.

The utility model discloses a realize like this:

a culinary article for culinary preparation comprising:

the pot body comprises a heat-insulating cover, a heating disc and a centrifugal fan, wherein the heating disc and the centrifugal fan are arranged in the heat-insulating cover;

the air-frying inner container is arranged in the heat-insulating cover and is positioned above the heating plate;

the cooking utensil further comprises an air inlet and a first air outlet, the air inlet is used for forming circulating air flow, the air inlet is communicated with the heat preservation cover, the first air outlet is arranged on the heat preservation cover, and the lower surface of the edge of the end of the heating plate is lower than the upper edge of the first air outlet and higher than the lower edge of the first air outlet.

The centrifugal fan has the characteristics of axially supplying air and circumferentially discharging air, so that heating airflow generated by heating the heating disc below the heating disc can flow to the periphery of the centrifugal fan, and flows to the periphery of the heating disc along the lower surface of the heating disc through the end of the heating disc along the lower surface, because the end of the heating disc is positioned between the upper end edge and the lower end edge of the first air outlet along the vertical position of the lower surface, and the centrifugal fan is arranged below the heating disc, the heating airflow flowing to the periphery along the lower surface of the end of the heating disc and the first air outlet have corresponding relation, so that the centrifugal fan can more conveniently push out part of the heating airflow carrying oil smoke or steam from the first air outlet, and supplement external fresh air through the air inlet to form circulating airflow, avoid the condition that the oil smoke or the steam is accumulated in the cooking cavity, and improve the cooking effect; meanwhile, the centrifugal fan, the heating plate and the first air outlet are correspondingly convenient to cool the heating plate to a certain extent in the cooking process by utilizing the centrifugal fan, so that the situation that the heating plate can be lowered for a long time after the temperature rises is avoided, new heat balance can be quickly achieved in the heat-insulating cover, the fluctuation time of the temperature is reduced, and the temperature regulating capability of the cooking appliance is improved, so that the cooking appliance can perform accurate cooking operation on food materials; in addition, after the culinary art is finished, centrifugal fan can also carry out quick cooling to the dish that generates heat, avoids the high temperature to lead to the user to get to put in the heat preservation cover and is scalded when eating the material.

Preferably, the upper surface of the end edge of the heating plate is higher than the upper end edge of the first air outlet; the heating air current initial stage that centrifugal fan formed is in the dish below that generates heat, and the end of the dish that generates heat is higher than the upper end of first air outlet along the upper surface and is inclined to the top along the position that can let whole dish that generates heat correspond first air outlet, and first air outlet has bigger area to correspond the end that generates heat and follows lower surface below for centrifugal fan can discharge more oil smoke or steam from first air outlet, improves the culinary art effect.

Or the upper surface of the end edge of the heating plate is lower than the upper edge of the first air outlet, and the height difference between the upper surface of the end edge and the upper edge of the first air outlet is smaller than the height difference between the lower surface of the end edge and the lower edge of the first air outlet.

Preferably, the upper end of the fan blade of the centrifugal fan is higher than the lower end edge of the first air outlet. The vertical position of flabellum and first air outlet position have corresponding relation, are favorable to carrying the direct first air outlet of following of the heating air current of oil smoke or steam and discharge on its flow path, improve the effect of culinary art.

Preferably, the air output of the centrifugal fan per unit time is greater than the air output of the first air outlet per unit time. Set up like this and can make the heating air current of avoiding producing through the heating of dish heating all follow first air outlet and flow, guarantee the heating efficiency of culinary art in-process.

Preferably, the pot body comprises a shell, a second air outlet is formed in the shell, an air outlet channel is arranged between the first air outlet and the second air outlet, the air outlet channel is provided with a windward side face, and the windward side face inclines from outside to inside to the opposite side of the windward side face. Therefore, the inclination direction of the windward side face and the flowing direction of the heating airflow have a corresponding relation, when the heating airflow flows to the windward side face, the flowing direction of the heating airflow does not need to turn at a large angle, the heating airflow can directly flow to the second air outlet along the windward side face, the flowing difficulty of the heating airflow from the first air outlet and the second air outlet is reduced, and the cooking effect is further improved.

Preferably, the pot body comprises a shell, a second air outlet is formed in the shell, an air outlet channel is arranged between the first air outlet and the second air outlet, and the top surface of the air outlet channel inclines downwards from outside to inside. The transverse flow heating airflow can flow upwards under the guidance of the inner wall of the heat preservation cover, the upward flowing heating airflow acts on the top surface of the air outlet channel, the inclined direction of the top surface and the flowing direction of the heating airflow have a corresponding relation, when the heating airflow flows to the top surface, the flowing direction of the heating airflow does not need to turn at a large angle, the heating airflow can directly flow to the second air outlet along the top surface, the flowing difficulty of the heating airflow from the first air outlet and the second air outlet is reduced, and the cooking effect is further improved.

Preferably, the housing is provided with a grille at the second air outlet. The grid can block that the foreign matter gets into the air-out passageway, avoids the foreign matter to amass and influences the radiating effect in having the air-out passageway. The grid also can block that the foreign matter gets into in the heat preservation cover, avoids components and parts work such as foreign matter influence centrifugal fan.

Preferably, the casing is provided with a baffle at the second air outlet, and the baffle is detachably or movably mounted so that the second air outlet can be opened or closed. When the pressure cooker is used, the second air outlet can be closed, so that heat loss is avoided, and cooking energy consumption is reduced. When the air fryer is used, the second air outlet can be closed at the initial stage of heating of the heating plate, so that the heating airflow can be rapidly heated, and the second air outlet can be opened after the heating plate works for a specific time or the heating airflow reaches a specific temperature, so that the temperature of the heating airflow can be controlled.

Preferably, a communicating piece is detachably arranged on the shell, the air outlet channel and the second air outlet are located on the communicating piece, and the communicating piece is in butt joint with the edge of the first air outlet. The air outlet channel can be disassembled and assembled from the outer side of the shell, the air outlet channel is convenient to disassemble and assemble, and the assembling efficiency of the air outlet channel is improved.

Preferably, a directional mounting structure is provided between the communication member and the housing. Therefore, the installation direction of the communicating piece can be ensured, the installation direction of the communicating piece is unique, and the windward side surface and the top surface of the air outlet channel can be correctly installed; the directional mounting structure comprises first fixing holes which are distributed on the communicating piece in a triangular mode and second fixing holes which correspond to the first fixing holes in the shell; when the installation angle of the communicating piece is wrong, the first fixing hole and the second fixing hole are staggered, and the installation cannot be finished, so that the communicating piece can be ensured to be installed correctly; or the directional mounting structure comprises a positioning column positioned on the communicating piece and a positioning hole matched with the positioning column on the shell; or, the directional mounting structure comprises an arc-shaped part and a square part which are positioned on the communicating piece, and an arc-shaped groove and a square groove which are correspondingly matched with the arc-shaped part and the square part on the shell respectively.

Drawings

FIG. 1 is a schematic cross-sectional view of a cooking appliance;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of the structure of the heat-insulating cover;

FIG. 4 is a schematic view of the housing;

FIG. 5 is a schematic view of the structure of the communicating member;

FIG. 6 is a first angular cross-sectional structural schematic view of the communication member;

FIG. 7 is a second cross-sectional angular view of the communication member.

Reference is made to the accompanying drawings in which: 100. a pan body; 110. a heat-preserving cover; 111. a first air outlet; 120. a heating plate; 121. a heat generating tube; 122. the end edge lower surface; 123. an end edge upper surface; 130. a centrifugal fan; 140. a housing; 141. a second air outlet; 142. an air outlet channel; 143. the windward side; 144. a top surface; 145. a communicating member; 146. a grid; 147. an installation port; 148. a first fixing hole; 149. a second fixing hole; 200. air-frying the inner container; 210. a frying basket; 220. a wind shield.

Detailed Description

The following detailed description is made of specific embodiments of the present invention with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and master. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The embodiment provides a cooking utensil with good cooking effect, which comprises a pressure cooker function and an air fryer function. The utility model discloses a mainly to the improvement of the relevant structure of air fryer function, the structure schematic diagram when cooking utensil uses the air fryer function is shown in the figure. When the pressure cooker function is used, the pressure inner container is replaced by the air-frying component comprising the frying basket 210, the air-frying inner container 200, the wind shielding piece 220 and the like.

As shown in fig. 1-3, the cooking appliance comprises a pot body 100 and an air-frying liner 200, wherein the pot body 100 comprises a heat-preserving cover 110, a heating plate 120 and a centrifugal fan 130, the heating plate 120 is arranged in the heat-preserving cover 110, and the centrifugal fan 130 is positioned below the heating plate 120; the air-frying liner 200 is arranged in the heat-insulating cover 110 and is positioned above the heating plate 120; the cooking utensil further comprises an air inlet and a first air outlet 111, wherein the air inlet and the heat preservation cover 110 are communicated, the first air outlet 111 is formed in the heat preservation cover 110, and the end edge lower surface 122 of the heating plate 120 is lower than the upper end edge of the first air outlet 111 and higher than the lower end edge of the first air outlet 111.

Specifically, fry basket 210 can be installed in air-fried inner bag 200, place food on fry basket 210 during the culinary art, dish 120 that generates heat produces the heat transfer and gives the surrounding air, centrifugal fan 130 makes the air that is heated by dish 120 that generates heat flow formation heating air current, heating air current flows into to fry basket 210 through air-fried inner bag 200 and heats the food in fry basket 210, the air current after heating food flows back to dish 120 that generates heat downwards again, by dish 120 reheating that generates heat, so constantly relapse, thereby realize the air-fried culinary art effect.

Because the air outlet position design of prior art is unreasonable, oil smoke and vapor etc. that produce among the air-fry culinary art are accumulated in the culinary art chamber easily, influence the culinary art effect. In the embodiment, by utilizing the characteristic that the centrifugal fan axially supplies air and circumferentially discharges air, the end of the heating plate is positioned between the upper end edge and the lower end edge of the first air outlet 111 along the vertical position of the lower surface 122, and the centrifugal fan 130 is arranged below the heating plate 120, so that the heating airflow flowing to the periphery along the lower surface 122 along the end of the heating plate has a corresponding relationship with the first air outlet 111, and the centrifugal fan 130 can more conveniently push out a part of the heating airflow carrying oil smoke or steam from the first air outlet 111 and supplement external fresh air through the air inlet to form circulating airflow, thereby avoiding the condition that the oil smoke or steam is accumulated in the cooking cavity and improving the cooking effect; meanwhile, the centrifugal fan 130, the heating plate 120 and the first air outlet 111 correspond to each other, so that the centrifugal fan 130 is conveniently utilized to cool the heating plate 120 to a certain extent in the cooking process, the situation that the heating plate can be lowered for a long time after the temperature rises is avoided, new heat balance can be achieved in the heat-insulating cover quickly, the temperature fluctuation time is shortened, the temperature adjusting capability of the cooking appliance is improved, and the cooking appliance can perform accurate cooking operation on food materials; in addition, after the culinary art is finished, centrifugal fan 130 can also carry out quick cooling to dish 120 that generates heat, avoids the high temperature to lead to the user to get to put in the heat preservation cover and is scalded when eating the material.

It should be noted that the specific position of the air inlet is not specifically limited, the air inlet can be arranged at the bottom of the pot body, or can be arranged at the side part of the pot body, or the cooking utensil is also provided with a pot cover covering the pot body, and the air inlet is arranged on the pot cover; of course, the air intake can set up alone, also can utilize assembly clearance to form the air outlet between each spare part of cooking utensil, the utility model discloses do not specifically restrict yet.

The heating plate 120 is provided with a heating tube 121, the lower surface of the heating plate 120 at the peripheral part of the heating tube 121 is an end edge lower surface 122, the end edge lower surface 122 is lower than the upper end edge of the first air outlet 111 and higher than the lower end edge of the first air outlet 111, and when the end edge lower surface 122 is inclined or concave-convex, the lowest position of the end edge lower surface 122 is lower than the upper end edge of the first air outlet 111 and higher than the lower end edge of the first air outlet 111.

As shown in fig. 1 and 2, an upper edge 123 of the end edge of the heating plate 120 is higher than an upper edge of the first air outlet 111. The initial stage of the heating airflow formed by the centrifugal fan 130 is located below the heating plate 120, the end edge of the heating plate 120, which is higher than the upper end edge of the first air outlet 111 along the upper surface 123, can make the whole heating plate 120 be inclined to the upper side in the position corresponding to the first air outlet 111, and the first air outlet 111 has a larger area and is located below the end edge lower surface 122 of the heating plate 120, so that the centrifugal fan 130 can discharge more oil smoke or steam from the first air outlet 111, and the cooking effect is improved.

In other optional embodiments, an upper edge surface 123 of the end edge of the heat generating tray 120 may also be lower than an upper edge of the first air outlet 111, and a height difference between the upper edge surface 123 and the upper edge of the first air outlet 111 is smaller than a height difference between a lower edge surface 122 and a lower edge of the first air outlet 111. Therefore, the position of the whole heating plate 120 corresponding to the first air outlet 111 is inclined upwards, and the air outlet effect of the first air outlet 111 is improved. In other alternative embodiments, the height difference between the upper edge surface 123 and the upper edge of the first air outlet 111 may also be greater than the height difference between the lower edge surface 122 and the lower edge of the first air outlet 111.

As shown in fig. 1, the upper end of the fan blade of the centrifugal fan 130 is higher than the lower edge of the first air outlet 111. The vertical position of flabellum and first air outlet 111 position have corresponding relation, are favorable to carrying the direct first air outlet of following of the heating air current of oil smoke or steam and discharge on its flow path, improve the effect of culinary art.

Preferably, an air volume of the centrifugal fan 130 per unit time is greater than an air volume of the first outlet 111 per unit time. Set up like this and can make the heating air current of avoiding producing through the heating of dish heating all follow first air outlet 111 and flow out, guarantee the heating efficiency among the culinary art process.

As shown in fig. 1, 2, 4, and 6, the pot 100 includes a casing 140, the casing 140 has a second air outlet 141, an air outlet channel 142 is disposed between the first air outlet 111 and the second air outlet 141, the air outlet channel 142 has a windward side 143, and the windward side 143 is inclined from outside to inside toward the opposite side of the windward side 143. Therefore, the inclination direction of the windward side 143 corresponds to the flowing direction of the heating airflow, and when the heating airflow flows to the windward side 143, the flowing direction of the heating airflow does not need to turn at a large angle, so that the heating airflow can directly flow to the second air outlet 141 along the windward side 143, the flowing difficulty of the heating airflow from the first air outlet 111 and the second air outlet 141 is reduced, and the cooking effect is further improved.

Taking fig. 6 as a perspective view, the centrifugal fan 130 rotates clockwise, the heating airflow is diffused all around and also rotates clockwise, the windward side surface 143 can guide the heating airflow to the lower right, and the angle at which the heating airflow needs to turn is reduced relative to horizontal direction or upper right direction, so that the heating airflow can be discharged from the second outlet 141 more smoothly along the windward side surface 143.

Further, as shown in fig. 7, the top surface 144 of the air outlet channel 142 is inclined downward from outside to inside. The transverse flowing heating airflow is guided by the inner wall of the heat preservation cover 110 to flow upwards and then flow into the air-frying liner 200, the upwards flowing heating airflow acts on the top surface 144 of the air outlet channel 142, the inclination direction of the top surface 144 and the flowing direction of the heating airflow have a corresponding relation, when the heating airflow flows to the top surface 144, the heating airflow is horizontal or inclined towards the right lower side relative to the top surface 144, the flowing direction of the heating airflow does not need to generate large-angle turning, the heating airflow can directly flow to the second air outlet 141 along the top surface 144, the outflow difficulty of the heating airflow from the first air outlet 111 and the second air outlet 141 is reduced, and the cooking effect is further improved.

As shown in fig. 5 and 7, the housing 140 is provided with a grille 146 at the second air outlet 141. The grille 146 can prevent the foreign matters from entering the air outlet channel 142, and the foreign matters are prevented from being accumulated in the air outlet channel 142 to influence the heat dissipation effect. The grille 146 can also prevent foreign matters from entering the heat-insulating cover 110, so as to prevent the foreign matters from affecting the operation of the components such as the centrifugal fan 130.

In other alternative embodiments, the housing 140 is provided with a baffle at the second air outlet 141, and the baffle is detachably or movably mounted to enable the second air outlet 141 to be opened or closed. When the pressure cooker is used, the second air outlet can be closed, so that heat loss is avoided, and cooking energy consumption is reduced. When the air fryer function is used, the second air outlet 141 can be closed at the initial stage of heating of the heating plate 120, so that the heating airflow can be rapidly heated, and after the heating plate 120 works for a specific time or the heating airflow reaches a specific temperature, the second air outlet 141 can be opened so as to facilitate the temperature control of the heating airflow.

As shown in fig. 1 to 7, a communication member 145 is detachably disposed on the housing 140, the air outlet channel 142 and the second air outlet 141 are located on the communication member 145, and the communication member 145 is abutted to an edge of the first air outlet 111. The housing 140 has a mounting opening 147 therein, and the communication member 145 is inserted into the mounting opening 147. Therefore, the air outlet channel 142 can be disassembled and assembled from the outer side of the shell 140, the air outlet channel 142 is convenient to disassemble and assemble, and the assembling efficiency of the air outlet channel 142 is improved. In other alternative embodiments, the communicating member 145 may be welded or integrally formed on the housing 140.

As shown in fig. 4 and 5, a directional mounting structure is provided between the communicating member 145 and the housing 140. This ensures the installation direction of the communication member 145, and ensures that the installation direction of the communication member 145 is unique, so that the windward side 143 and the top 144 of the outlet channel 142 can be correctly installed.

Specifically, the directional mounting structure includes first fixing holes 148 distributed in a triangular manner on the communicating member 145, and second fixing holes 149 corresponding to the first fixing holes 148 on the housing 140; one of the three first fixing holes 148 is located at the middle of the upper edge of the communicating member 145, and the other two are located at both ends of the lower edge of the communicating member 145, forming an isosceles triangle distribution. When the installation angle of the communication piece 145 is wrong, the first fixing hole 148 and the second fixing hole 149 are dislocated, and the installation cannot be completed, so that the communication piece 145 can be correctly installed, and the positions of the top surface 144 and the windward side surface 143 are correct.

In other alternative embodiments, the directional mounting structure may be implemented by matching positioning posts with positioning holes, and the directional mounting structure includes positioning posts located on the communicating member 145 and positioning holes on the housing 140 matching with the positioning posts, and the communicating member 145 must be correctly mounted to match the positioning posts with the positioning holes.

In other alternative embodiments, the directional mounting structure may also be an asymmetric structure of the communicating member 145 and the mounting opening 147, and specifically, the directional mounting structure includes an arc portion and a square portion on the communicating member 145, and an arc groove and a square groove on the housing 140, which are respectively correspondingly matched with the arc portion and the square portion.

In the description of the present invention, it is to be understood that the terms "central", "lateral", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, 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 specifically limited otherwise. In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It should be understood by those skilled in the art that, although the embodiments of the present invention have been described above, the embodiments are only used for understanding the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Any person skilled in the art to which the embodiments of the present invention pertain will be able to make modifications and changes in form and details of implementation without departing from the spirit and scope of the embodiments of the present invention, but the scope of the embodiments of the present invention is to be accorded the full scope defined in the appended claims.

Claims (10)

1. A culinary article for culinary preparation comprising:

the pot body comprises a heat-insulating cover, a heating disc and a centrifugal fan, wherein the heating disc and the centrifugal fan are arranged in the heat-insulating cover;

the air-frying inner container is arranged in the heat-insulating cover and is positioned above the heating plate;

the cooking utensil is characterized by further comprising an air inlet and a first air outlet, wherein the air inlet and the first air outlet are used for forming circulating air flow, the air inlet is communicated with the heat preservation cover, the first air outlet is arranged on the heat preservation cover, and the end edge of the heating plate is lower than the upper end edge of the first air outlet and higher than the lower end edge of the first air outlet.

2. The cooking utensil of claim 1, wherein the top edge of the heating plate is higher than the top edge of the first air outlet;

or the upper surface of the end edge of the heating plate is lower than the upper edge of the first air outlet, and the height difference between the upper surface of the end edge and the upper edge of the first air outlet is smaller than the height difference between the lower surface of the end edge and the lower edge of the first air outlet.

3. The cooking utensil of claim 1 wherein the centrifugal fan has an upper end higher than a lower edge of the first outlet.

4. The cooking utensil of claim 1 wherein the centrifugal fan delivers more air per unit time than the first outlet.

5. The cooking utensil of claim 1, wherein the pot includes a housing, the housing has a second outlet, an outlet channel is disposed between the first outlet and the second outlet, the outlet channel has a windward side, and the windward side is inclined from outside to inside toward the opposite side of the windward side.

6. The cooking utensil of claim 1, wherein the pot body comprises a casing, the casing is provided with a second air outlet, an air outlet channel is arranged between the first air outlet and the second air outlet, and the top surface of the air outlet channel is inclined downwards from outside to inside.

7. A culinary effective cooking utensil according to claim 5 or 6 wherein the housing is provided with a grill at the second air outlet.

8. The cooking utensil of claim 5 or 6 wherein the housing has a baffle at the second air outlet, the baffle being removably or movably mounted to enable the second air outlet to be opened or closed.

9. The cooking utensil of claim 5 or 6 wherein the housing is detachably provided with a communication member, the outlet channel and the second outlet are located on the communication member, and the communication member is abutted to the edge of the first outlet.

10. The culinary article of claim 9, wherein a directional mounting arrangement is provided between the communication member and the housing;

the directional mounting structure comprises first fixing holes which are distributed on the communicating piece in a triangular mode and second fixing holes which correspond to the first fixing holes in the shell;

or the directional mounting structure comprises a positioning column positioned on the communicating piece and a positioning hole matched with the positioning column on the shell;

or, the directional mounting structure comprises an arc-shaped part and a square part which are positioned on the communicating piece, and an arc-shaped groove and a square groove which are correspondingly matched with the arc-shaped part and the square part on the shell respectively.

Images