Aerosol generating apparatus and microwave heating assembly thereof

Abstract

An aerosol generating apparatus and a microwave heating assembly (10) thereof. The microwave heating assembly (10) comprises: an outer conductor unit (1), which comprises a closed end (11), an open end (12) opposite the closed end (11), and a cavity (13) formed between the closed end (11) and the open end (12), an accommodating cavity (41) being formed in the cavity (13); and an inner conductor unit (2), which is arranged in the cavity (13), the inner conductor unit (2) comprising a radiation structure (21), and the radiation structure (21) being arranged around the periphery of the accommodating cavity (41). The aerosol generating apparatus comprises a microwave generating unit and the microwave heating assembly (10). The microwave heating assembly (10) further comprises a microwave feeding unit (3), which is connected to the microwave generating unit and feeds microwaves generated by the microwave generating unit into the cavity (13). The microwave heating assembly (10) uses a circumferential heating mode, and the radiation structure (21) is arranged around the periphery of the accommodating cavity (41) such that a relatively uniform circular strong field area may be formed while ensuring the feeding efficiency of the microwaves, so as to focus a microwave field. Rapid heating of an aerosol generating article (20) may be achieved and atomization efficiency may be improved.

Description

Aerosol generating device and microwave heating component thereof Technical Field

[0001] The present invention relates to the technical field of aerosol generation, and in particular to an aerosol generating device and a microwave heating component thereof. Background Art

[0002] In related aerosol generating devices, traditional heating methods such as conduction and radiation are usually used. Microwaves, as a more efficient, three-dimensional heating method with lower thermal inertia, have huge room for development in this field. However, using microwaves to heat aerosol-generating products requires a small cavity and a high-density energy field. In the related microwave field, similar scenarios (i.e., the local generation of high-energy-density microwave fields in small areas) generally occur in microwave plasma excitation. The most widely used is the related deformation structure based on the quarter-wavelength coaxial resonant cavity structure. Similar microwave field distribution is basically concentrated near the single or multiple tip positions of the inner conductor.

[0003] Therefore, it is crucial to design the cavity structure to match the shape of the aerosol-generating product within a small cavity. Problems with cavity matching can lead to a failure to feed microwaves or low microwave feeding efficiency. Furthermore, an inappropriate microwave field distribution within the cavity can easily lead to poor heating of the aerosol-generating product, such as slow atomization or partial burning. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an improved aerosol generating device and a microwave heating component thereof.

[0005] The technical solution adopted by the present invention to solve the technical problem is to construct a microwave heating component for an aerosol generating device, comprising:

[0006] an outer conductor unit comprising a closed end, an open end opposite to the closed end, and a cavity formed between the closed end and the open end; a receiving chamber for receiving the aerosol generating article is formed in the cavity; and

[0007] an inner conductor unit, which is disposed in the cavity;

[0008] The inner conductor unit includes a radiation structure, and the radiation structure is arranged around the circumference of the receiving cavity.

[0009] In some embodiments, the radiation structure includes a radiation element, and the radiation element is ring-shaped.

[0010] In some embodiments, the radiation structure includes at least two radiation elements, and the at least two radiation elements are arranged transversely in the circumferential direction of the receiving cavity.

[0011] In some embodiments, the longitudinal section of each of the radiation elements is T-shaped.

[0012] In some embodiments, the radiating element includes a main body portion and an extension portion, the main body portion is extended along an axis parallel to the outer conductor unit, and the cross-section of the main body portion is fan-shaped; the extension portion extends along an arc with a center falling on the axis of the outer conductor unit.

[0013] In some embodiments, the inner conductor unit further includes an inner conductor body, the inner conductor body including a fixed end and a free end opposite to the fixed end, the fixed end is fixed to the outer conductor unit and is in ohmic contact with the outer conductor unit; the radiating structure is connected to the free end.

[0014] In some embodiments, the inner conductor body includes a first conductor post, which is coaxially fixed to the outer conductor unit and is in ohmic contact with the outer conductor unit.

[0015] In some embodiments, the inner conductor body further includes a conductor disk, one end of which is connected to the first conductor post, the other end of which extends axially toward the outer conductor unit, and an outer diameter of the conductor disk is greater than an outer diameter of the first conductor post.

[0016] In some embodiments, the inner conductor body further includes at least one second conductor post, and the second conductor post and the first conductor post are fixed to the outer conductor unit at intervals and in ohmic contact with the outer conductor unit.

[0017] The present invention also constructs an aerosol generating device, including a microwave generating unit and the above-mentioned microwave heating component, wherein the microwave heating component also includes a microwave feeding unit connected to the outer conductor unit, and the microwave feeding unit is connected to the microwave generating unit and feeds the microwave generated by the microwave generating unit into the cavity.

[0018] The implementation of the present invention has the following beneficial effects: the present invention adopts a circumferential heating cavity method, and the radiation structure is arranged around the circumference of the receiving cavity, which can form a circle of relatively uniform strong field area while ensuring the feeding efficiency of the microwave to focus the microwave field, thereby realizing rapid heating of the aerosol-generating product and improving the atomization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] FIG1 is a schematic structural diagram of an embodiment of a microwave heating assembly of the present invention;

[0021] FIG2 is a cross-sectional view of an embodiment of a microwave heating assembly of the present invention;

[0022] FIG3 is a schematic structural diagram of the microwave heating assembly shown in FIG2 omitting the outer conductor unit;

[0023] FIG4 is a cross-sectional view of another embodiment of a microwave heating assembly of the present invention;

[0024] FIG5 is a schematic structural diagram of the microwave heating assembly shown in FIG4 omitting the outer conductor unit;

[0025] FIG6 is a cross-sectional view of another embodiment of a microwave heating assembly of the present invention;

[0026] FIG7 is a cross-sectional view of the microwave heating assembly shown in FIG6 from another perspective;

[0027] FIG8 is a schematic structural diagram of the microwave heating assembly shown in FIG6 omitting the outer conductor unit;

[0028] FIG9 is a cross-sectional view of another embodiment of a microwave heating assembly of the present invention;

[0029] FIG10 is a schematic structural diagram of the microwave heating assembly shown in FIG9 omitting the outer conductor unit;

[0030] FIG11 is a diagram of the microwave energy field distribution of the microwave heating assembly shown in FIG2 ;

[0031] FIG12 is a diagram showing the microwave energy field distribution of the microwave heating assembly shown in FIG4 ;

[0032] FIG13 is a diagram showing the microwave energy field distribution of the microwave heating assembly shown in FIG9 . DETAILED DESCRIPTION

[0033] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0034] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0036] Figures 1 to 10 illustrate aerosol-generating devices according to some embodiments of the present invention, which utilize microwaves to heat an aerosol-generating article 20 to generate aerosol for inhalation by a user. The microwave frequency of the present invention is approximately 2400 MHz to 2500 MHz.

[0037] As shown in Figure 1, in some embodiments, the aerosol generating device includes a microwave heating component 10 and a microwave generating unit (not shown), a control component (not shown) and a power supply component (not shown). The power supply component is used to provide electrical energy to the microwave heating component 10, the microwave generating unit and the control component. The control component is used to control the operation of the microwave heating component 10 and the microwave generating unit. The microwave generating unit can generate microwave signals and feed microwaves into the microwave heating component 10 by connecting to the microwave heating component 10. The microwave heating component 10 uses microwaves to heat the aerosol generating product 20.

[0038] In some embodiments, the microwave heating assembly 10 may be substantially cylindrical. Of course, the microwave heating assembly 10 is not limited to a cylindrical shape, and may also be in other shapes such as a square column or an elliptical column.

[0039] Referring to Figures 2 and 3 , the microwave heating assembly 10 includes an outer conductor unit 1, an inner conductor unit 2, and a microwave feed unit 3. The outer conductor unit 1 has a closed end 11 and an open end 12 opposite the closed end 11, and defines a semi-enclosed cavity 13. The cavity 13 includes a receiving chamber 41 for accommodating the aerosol-generating article 20. The outer conductor unit 1 can be made of metal or other highly conductive materials and is used to confine microwave energy within the cavity 13. The shape of the outer conductor unit 1 includes, but is not limited to, a cylinder and a rectangular parallelepiped, and the size of the outer shell can be adjusted according to the size of the aerosol-generating article 20.

[0040] In some embodiments, the microwave heating assembly 10 may further include a receiving seat 4, which is fixedly or detachably mounted at the open end 12 of the outer conductor unit 1. The receiving seat 4 may be roughly hollow cylindrical, and a receiving cavity 41 may be formed in the receiving seat 4. The receiving cavity 41 is located in the main area where the microwave field is formed.

[0041] The material of the receiving seat 4 may include polymer materials, ceramic materials, metal materials, or glass materials. Specifically, polymer materials may include polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polystyrene polymer (PPSU), polycarbonate (PC), ABS, polypropylene (PP), etc.; ceramic materials may include aluminum oxide, zirconium oxide, etc. In practical applications, polymer materials are preferred due to their advantages such as low cost and low thermal conductivity.

[0042] Of course, the receiving seat 4 is not a necessary component in the present invention. The aerosol generating product 20 can also be directly inserted into the cavity 13 from the open end 12 of the outer conductor unit 1. The receiving seat 4 can protect the cavity 13 and the inner conductor body from being contaminated by mist or as little as possible.

[0043] As shown in Figures 2, 4, 6, 7 and 9, the outer conductor unit 1 may include a conductor side wall 14 and a conductor end wall 15. The conductor side wall 14 may be cylindrical, and the top of the conductor side wall 14 is open to form the open end 12 of the outer conductor unit 1. The bottom end of the conductor side wall 14 is also open to form the conductor end wall 15, which is integrally sealed to the bottom end of the conductor side wall 14 to form the closed end 11 of the outer conductor unit 1.

[0044] A feeding hole is formed on the conductor side wall 14, which is formed vertically through the conductor side wall 14 in a direction perpendicular to the central axis of the conductor side wall 14, for inserting the microwave feeding unit 3 into the cavity 13. Of course, the feeding hole can also be formed on the conductor end wall 15, and the microwave feeding unit 3 is inserted into the cavity 13 from the bottom of the microwave heating assembly 10.

[0045] The microwave feeding unit 3 is detachably mounted on the outer conductor unit 1 and is used to feed the microwaves generated by the microwave generating unit into the cavity 13, thereby forming a microwave field in the cavity 13 that can act on the aerosol generating product 20. The microwave field can act on the aerosol generating product 20 to achieve microwave heating thereof.

[0046] One end of the microwave feeding unit 3 is inserted into the cavity 13 from the feeding hole of the outer conductor unit 1 and is in ohmic contact with the inner conductor unit 2. In some embodiments, one side of the microwave feeding unit 3 is connected to the microwave generating device and is connected through a coaxial connector or a microstrip line, and the other side extends into the cavity 13 and forms an ohmic contact with the cavity 13. The microwave feeding unit 3 is made of metal material, preferably, it can be made of metal aluminum or copper. Furthermore, its outer surface can be coated with silver or gold. As shown in Figure 2, in some embodiments, the microwave feeding unit 3 includes an inner conductor 31, an outer conductor 32, and a dielectric layer 33 between the inner conductor 31 and the outer conductor 32.

[0047] The outer conductor may be cylindrical, and both ends of the outer conductor are open; during assembly, the outer peripheral side surface of the outer conductor is in ohmic contact with the inner wall surface of the feed hole.

[0048] The inner conductor 31 has a straight, needle-like structure. One end of the inner conductor 31 is a connection end, located within the outer conductor 32, for connecting to the microwave generating unit and receiving microwaves. The other end of the inner conductor 31 is a feed-in end, located outside the outer conductor 32. During assembly, it can extend into the cavity 13 and form a good ohmic contact with the inner conductor unit 2. Of course, the feed-in end of the inner conductor 31 is not limited to ohmic contact with the inner conductor unit 2; it can also form an ohmic contact directly with the outer conductor unit 1.

[0049] It is understandable that the shape of the inner conductor 31 is not limited to a straight line. The inner conductor 31 may also be L-shaped (not shown). For example, the inner conductor 31 may include a first section perpendicular to the central axis of the cavity 13 and a second section parallel to the central axis of the cavity 13. The first section is partially located in the outer conductor 32 and is integrally connected to one end of the second section. The other end of the second section is arranged outside the outer conductor 32 and is in direct ohmic contact with the conductor end wall 15 of the outer conductor unit 1.

[0050] The inner conductor unit 2 primarily serves as a microwave conductor. It is positioned within the cavity 13 of the outer conductor unit 1 and provides good ohmic contact with the outer conductor unit 1, coupling the energy introduced by the microwave feed unit 3 into the cavity 13. The inner conductor unit 2 includes a radiating structure 21, which is arranged around the circumference of the receiving cavity 41 to adjust the microwave field distribution and resonant frequency within the cavity 41. By utilizing a circumferential heating method within the cavity 13, a relatively uniform strong field region can be formed within a certain height range of the aerosol-generating article 20 while ensuring microwave feed efficiency, thereby heating the aerosol-generating article 20.

[0051] The inner conductor unit 2 also includes an inner conductor body, which is connected to the closed end 11 of the outer conductor unit 1 and is in ohmic contact with the conductor end wall 15, forming a short-circuit end of the microwave heating component 10. The radiation structure 21 is located in the cavity 13 but is not in direct contact with the outer conductor unit 1, forming an open-circuit end of the microwave heating component 10.

[0052] As shown in Figure 3, the inner conductor body includes a fixed end 221 and a free end 222 opposite the fixed end 221. The fixed end 221 is fixed to the outer conductor element 1 and forms ohmic contact therewith. The radiating structure 21 can be coupled to the free end 222 of the inner conductor body. The end of the inner conductor body away from the open end 12 of the outer conductor element 1 is the fixed end 221, which can be fixedly connected to the bottom of the outer conductor element 1. The end of the inner conductor body closer to the open end 12 is the free end 222, which extends toward the open end 12 of the outer conductor element 1.

[0053] The inner conductor body includes a first conductor post 223, which can be cylindrical or polygonal (e.g., square). The first conductor post 223 is coaxially arranged with the outer conductor unit 1 and fixed to the conductor end wall 15 of the outer conductor unit 1, and is in ohmic contact with the outer conductor unit 1.

[0054] The microwave coupling between the inner conductor unit 2 and the microwave feeding unit 3 can be a direct contact electrical connection as shown in FIG2 , an electrical coupling as shown in FIG4 , a magnetic coupling as shown in FIG6 , FIG7 and FIG9 , or other structures that can achieve microwave matching.

[0055] In some embodiments, as shown in Figures 2 and 3, the inner conductor body can be formed by splicing together multiple cylinders of different shapes. In this embodiment, the inner conductor body includes a first conductor post 223 and a conductor disc 224. One end of the conductor disc 224 can be connected to the first conductor post 223, and the other end of the conductor disc 224 extends axially in the outer conductor unit 1. The conductor disc 224 can have a different shape and / or size than the first conductor post 223. The conductor disc 224 can be coaxially coupled to the top of the first conductor post 223, with an outer diameter greater than that of the first conductor post 223 and smaller than the diameter of the cavity 13. The radial distance between the conductor disc 224 and the inner wall of the cavity 13 is much smaller than the radial distance between the first conductor post 223 and the inner wall of the cavity 13. It is understood that in this embodiment, the free end 222 is formed at the end of the conductor disc 224 near the open end 12. The inner conductor body further includes a connecting portion 225 , through which the conductor disk 224 is connected to the radiation structure 21 . The connecting portion 225 is coupled to an end of the conductor disk 224 close to the open end 12 .

[0056] In other embodiments, as shown in Figures 4 and 5, the inner conductor body includes a first conductor post 223 and at least one second conductor post 226. The second conductor post 226 and the first conductor post 223 are fixed to the conductor end wall 15 of the outer conductor unit 1 at intervals and form ohmic contact with the outer conductor unit 1. It will be appreciated that in this embodiment, the free end 222 is formed at the end of the second conductor post 226 that is closest to the open end 12. In this embodiment, the second conductor post 226 can have a regular columnar shape, such as a circular cylinder or a square cylinder.

[0057] In yet other embodiments, as shown in Figures 6 to 8 , the inner conductor body also includes a first conductor post 223 and at least one second conductor post 226. The second conductor post 226 and the first conductor post 223 are fixed to the conductor end wall 15 of the outer conductor unit 1 at intervals and in ohmic contact with the outer conductor unit 1. However, unlike the embodiment shown in Figure 3 , the second conductor post 226 can have an irregular shape, such as a cylinder with a T-shaped longitudinal cross-section. As long as it meets the requirements for microwave field transmission, its shape can be modified as needed and is not specifically limited here.

[0058] The radiating structure 21 is electrically connected to the inner conductor unit 2. As shown in Figures 2 to 5, in some embodiments, to achieve circumferential heating, the radiating structure 21 can be annular. To match the shape of the receiving seat 4, the radiating structure 21 can be annular, used to generate a circumferential strong field region around the aerosol-generating article 20, corresponding to the circumferential heating effect on the aerosol-generating article 20. It can be understood that the radiating structure 21 in this case includes a radiating element 211, and the radiating element 211 is annular.

[0059] As shown in Figures 6 to 8 , the radiation structure 21 includes at least two radiation elements 211, which are arranged transversely around the circumference of the receiving cavity 41. Specifically, the at least two radiation elements 211 can be arranged transversely along the same horizontal line to form a relatively uniform strong field region for heating the aerosol-generating article 20. It will be appreciated that in this embodiment, the number of radiation elements 211 can be adjusted based on their shape and size to ensure that a relatively uniform strong field region is formed around the circumference of the receiving cavity 41. Therefore, the distance between adjacent radiation elements 211 can also be adjusted based on actual conditions.

[0060] In some embodiments, each radiating element 211 has a T-shaped longitudinal cross-section. Specifically, the radiating element 211 may include a main body 2111 and an extension 2112. The main body 2111 extends parallel to the axis of the outer conductor unit 1 and may be coupled to the free end 222. The main body 2111 may have a fan-shaped cross-section. The extension 2112 extends along an arc centered on the axis of the outer conductor unit 1. Of course, the shape of the radiating element 211 is not limited to a T-shaped longitudinal cross-section. It may also be a semi-circular ring. For example, two semi-circular ring-shaped radiating elements 211 are arranged transversely around the circumference of the receiving cavity 41 to form a relatively uniform strong field region. Alternatively, multiple radiating elements 211 of different shapes may be freely combined to generate a circumferential strong field around the aerosol generating article 20. The shape of the radiating element 211 can be modified as needed and is not specifically limited here.

[0061] Understandably, in order to further focus the microwave field, as shown in FIG9 and FIG10 , in some further embodiments, a ring-shaped radiation element 211 may be arranged axially side by side with at least two radiation elements 211 having a T-shaped longitudinal section.

[0062] As shown in Figures 11 to 13, there are respectively shown the microwave energy field distribution diagrams of some embodiments of the present invention. In this test, the radiation structure 21 is arranged around the circumference of the receiving cavity 41, so that the microwave energy is focused around the aerosol generating product, so that the aerosol generating product 20 is heated evenly, and rapid heating of the aerosol generating product 20 can be achieved.

[0063] In summary, the present invention can achieve efficient microwave feeding in a small-sized cavity 13. By setting the radiation structure 21 around the circumference of the receiving cavity 41, a relatively uniform circle of strong field distribution area is formed to focus the microwave field, thereby achieving rapid heating of the aerosol-generating product 20 and improving the atomization efficiency.

[0064] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A microwave heating assembly for an aerosol generating device, characterized in that: include: An outer conductor unit (1) comprising a closed end (11), an open end (12) opposite to the closed end (11), and a cavity (13) formed between the closed end (11) and the open end (12); a receiving cavity (41) for receiving an aerosol generating product (20) is formed in the cavity (13); and An inner conductor unit (2) arranged in the cavity (13); The inner conductor unit (2) comprises a radiation structure (21), and the radiation structure (21) is arranged around the circumference of the accommodation cavity (41).

2. The microwave heating assembly according to claim 1, characterized in that: The radiation structure (21) comprises a radiation element (211), and the radiation element (211) is in a ring shape.

3. The microwave heating assembly according to claim 1, characterized in that: The radiation structure (21) comprises at least two radiation elements (211), and the at least two radiation elements (211) are arranged transversely in the circumferential direction of the receiving cavity (41).

4. The microwave heating assembly according to claim 3, characterized in that: The longitudinal section of each radiation element (211) is T-shaped.

5. The microwave heating assembly according to claim 4, characterized in that: The radiation element (211) comprises a main body portion (2111) and an extension portion (2112); the main body portion (2111) is extended along an axis parallel to the outer conductor unit (1), and the cross section of the main body portion (2111) is fan-shaped; the extension portion (2112) extends along an arc whose center falls on the axis of the outer conductor unit (1).

6. The microwave heating assembly according to any one of claims 1 to 5, characterized in that: The inner conductor unit (2) further comprises an inner conductor body, the inner conductor body comprising a fixed end (221) and a free end (222) opposite to the fixed end (221), the fixed end (221) being fixed to the outer conductor unit (1) and in ohmic contact with the outer conductor unit (1); the radiating structure (21) is connected to the free end (222).

7. The microwave heating assembly according to claim 6, characterized in that: The inner conductor body comprises a first conductor column (223), the first conductor column (223) being coaxially fixed to the outer conductor unit (1) and being in ohmic contact with the outer conductor unit (1).

8. The microwave heating assembly according to claim 7, characterized in that: The inner conductor body further comprises a conductor disc (224), one end of the conductor disc (224) being connected to the first conductor post (223), the other end of the conductor disc (224) extending in the axial direction of the outer conductor unit (1), and the outer diameter of the conductor disc (224) being greater than the outer diameter of the first conductor post (223).

9. The microwave heating assembly according to claim 7, characterized in that: The inner conductor body further comprises at least one second conductor post (226), wherein the second conductor post (226) and the first conductor post (223) are fixed to the outer conductor unit (1) at intervals and are in ohmic contact with the outer conductor unit (1).

10. An aerosol generating device, characterized in that: The microwave heating component (10) comprises a microwave generating unit and any one of claims 1 to 9, wherein the microwave heating component (10) further comprises a microwave feeding unit (3) connected to the outer conductor unit (1), wherein the microwave feeding unit (3) is connected to the microwave generating unit and feeds the microwave generated by the microwave generating unit into the cavity (13).

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