CN211832829U

CN211832829U - Electronic atomization device and atomizer thereof

Info

Publication number: CN211832829U
Application number: CN201922383052.2U
Authority: CN
Inventors: 何丹充; 沈丕发
Original assignee: Shenzhen Smoore Technology Ltd
Current assignee: Shenzhen Smoore Technology Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-11-03
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses an electronic atomization device and atomizer thereof, this atomizer include the atomizing seat and install the casing on the atomizing seat, define out the stock solution chamber between atomizing seat and the casing, still include: the atomizing device comprises at least one clamping hole formed in the shell, at least one clamping part arranged on the atomizing base and in clamping fit with the clamping hole, and a ventilation channel communicated with the liquid storage cavity; the ventilation channel is also communicated with the outside through at least one clamping hole. Through implementing the utility model discloses, both be used for fixedly with the card hole, also be used for as the air inlet of the passageway of taking a breath, the passageway of taking a breath makes and is linked together through calorie hole and external world to reduce trompil on the casing, promote the aesthetic feeling, improve user experience.

Description

Electronic atomization device and atomizer thereof

Technical Field

The utility model relates to an atomizing device especially relates to an electronic atomizing device and atomizer thereof.

Background

At present, a plurality of clamping holes and air inlets for fixing are generally formed in the electronic cigarette, but the aesthetic feeling of the electronic cigarette is necessarily affected by the porous design of the electronic cigarette due to the general trend of miniaturization and beautification of the electronic cigarette, and the clamping holes are only used for fixing, so that the user experience is reduced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing an electronic atomization device and atomizer thereof.

The utility model provides a technical scheme that its technical problem adopted is: constructed an atomizer, including the atomizing seat and install casing on the atomizing seat, the atomizing seat with define out the stock solution chamber between the casing, still include:

the atomizing device comprises at least one clamping hole formed in the shell, at least one clamping part arranged on the atomizing base and in clamping fit with the clamping hole, and a ventilation channel communicated with the liquid storage cavity;

the ventilation channel is communicated with the outside through at least one clamping hole.

Preferably, in the atomizer of the present invention, an air inlet gap is formed between the locking hole and the fastening portion.

Preferably, in the atomizer of the present invention, the ventilation channel includes:

an air inlet communicated with the outside;

a cavity communicated with the air inlet;

the air exchange groove is communicated with the cavity and the liquid storage cavity;

the cavity is annular or a part of the annular, and one end of the cavity, which is close to the ventilation groove, has capillary force.

Preferably, in the atomizer of the present invention, when the liquid in the liquid storage chamber overflows to the cavity, the cavity is close to one end of the ventilation groove and locks the liquid by capillary force.

The utility model also constructs an electron atomizing device, include the atomizing seat and install casing on the atomizing seat, the atomizing seat with define out the stock solution chamber between the casing, its characterized in that still includes:

Preferably, in the electronic atomizer of the present invention, an air inlet gap is formed between the fastening hole and the fastening portion.

Preferably, in the electronic atomizer of the present invention, the ventilation channel includes:

an air inlet communicated with the outside;

a cavity communicated with the air inlet;

Preferably, in the electronic atomization device of the present invention, when the liquid in the liquid storage chamber overflows to the cavity, the cavity is close to one end of the ventilation groove and locks the liquid by capillary force.

Preferably, in the electronic atomization device of the present invention, the electronic atomization device further includes an atomization core, and the cavity surrounds or partially surrounds the atomization core.

Preferably, in the electronic atomizer of the present invention, the longitudinal cross section of the cavity has an inverted V-shape.

Through implementing the utility model discloses, following beneficial effect has:

the utility model discloses a design one and the liquid storage chamber is linked together the passageway of taking a breath, both be used for fixedly with the card hole, also be used for as the air inlet of the passageway of taking a breath, the order passageway of taking a breath is linked together through calorie hole and external world to reduce trompil on the casing, promote the aesthetic feeling, improve user experience.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic perspective view of an atomizer according to a first embodiment of the present invention;

FIG. 2 is a schematic longitudinal sectional view of the atomizer shown in FIG. 1;

FIG. 3 is a schematic perspective exploded view of the atomizer of FIG. 1;

FIG. 4 is a schematic perspective exploded view of an atomizing base assembly of the atomizer of FIG. 3;

fig. 5 is a schematic perspective view of the upper base shown in fig. 4;

fig. 6 is a schematic perspective view of the upper housing shown in fig. 4 from another angle;

FIG. 7 is a schematic perspective longitudinal sectional view of the atomizer shown in FIG. 1;

fig. 8a-8c are enlarged views of the cavity and the aeration tank of the atomizer shown in fig. 2 in longitudinal section.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It should be understood that the orientations and positional relationships indicated by the terms "upper", "lower", "top", "bottom", and the like are constructed and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the technical solution, but do not indicate that the indicated device or element must have a specific orientation, and thus, should not be construed as limiting the present invention.

Fig. 1 and 2 show an atomizer according to a first embodiment of the present invention, which may form an electronic atomizer together with a battery device for providing atomization to liquid media such as tobacco smoke or liquid medicine. This atomizer includes atomizing seat 1 and installs casing 3 on atomizing seat 1, defines out stock solution chamber 4 between atomizing seat 1 and the casing 3, still includes: at least one clamping hole formed in the shell 3, at least one clamping part 118 arranged on the atomizing base 1 and in clamping fit with the clamping hole, and a ventilation channel communicated with the liquid storage cavity 4; the ventilation channel is also communicated with the outside through at least one clamping hole. In the present embodiment, an air inlet gap may be formed between the fastening hole and the fastening portion 118, and the ventilation channel is communicated with the outside through the air inlet gap. In other embodiments, a hole may be formed at the fastening portion 118 as an air inlet hole through which the ventilation channel communicates with the outside.

In this embodiment, the ventilation channel includes: an air inlet 63 communicating with the outside, a cavity 61 communicating with the air inlet 63, and an air exchange groove communicating the cavity 61 and the reservoir chamber 4. And, the card hole can regard as this air inlet 63 of taking a breath the passageway to with joint portion 118 snap-fit, form the gap that admits air, thereby reduce trompil on the casing, promote the aesthetic feeling, improve user experience.

In this embodiment, realize being linked together stock solution chamber and external world through this passageway of taking a breath, for stock solution chamber tonifying qi, realize gas-liquid balance, make the stock solution chamber lower liquid more unobstructed. In some embodiments, the cavity 61 is a ring or a part of a ring, one end of the cavity 61 close to the air exchanging groove 62 has a capillary force, when the liquid in the liquid storage cavity 4 overflows to the cavity 61, one end of the cavity 61 close to the air exchanging groove 62 locks the liquid through the capillary force, so that the liquid locking in the resting state is realized, and meanwhile, the leaked liquid in one end of the cavity 61 close to the air exchanging groove 62 in the suction state is recycled.

And the atomizer also comprises the atomizing core 20, the cavity 61 can be a closed loop or a section or a subsection of an annular shape, and the cavity 61 surrounds or partially surrounds the atomizing core 20, so that the space is fully utilized. In this embodiment, the cavity 61 is a closed loop.

In the present embodiment, the cavity 61 is gradually narrowed toward the ventilation slot 62, so that one end of the cavity 61 close to the ventilation slot 62 has capillary force. Also, the longitudinal cross-section of the cavity 61 is preferably inverted V-shaped.

The atomizer in the present embodiment may comprise an atomizing base 1 for mechanically and electrically connecting with a battery device, an atomizing assembly 2 mounted in the atomizing base 1, and a housing 3 sleeved on the atomizing base 1. Wherein, a liquid storage cavity 4 for storing liquid media is defined between the atomizing base 1 and the shell 3. Atomization component 2 is connected with the liquid storage cavity 4 drain to and atomizing seat 1 between be defined with the atomizing chamber, this atomizing chamber is used for heating atomizing medium and outside air mix behind the circular telegram with atomization component 2.

In the present embodiment, the cavity 61 is enclosed by the inner wall of the housing 3 and a part of the outer wall of the atomizing base 1. In other embodiments, the cavity 61 may also be formed inside the atomizing base 1, the atomizing base 1 and the housing 3 are closely sleeved to form an air inlet 63 communicated with the cavity 61, and the top of the atomizing base 1 is provided with a ventilation slot 62 communicated with the liquid storage cavity 4.

Referring to fig. 3 and 4 together, the atomizing base 1 in this embodiment includes a lower base 10 for mechanically and electrically connecting with the battery device, and an upper base 11 embedded on the top of the lower base 10, wherein the upper base 11 is used for carrying the atomizing assembly 2. Casing 3 cup joints on last pedestal 11 and lower pedestal 10, defines out stock solution chamber 4 and the passageway of taking a breath between casing 3 and the last pedestal 11, and the joint cooperation between casing 3 and the lower pedestal 10.

As shown in fig. 2 and 7, in particular, the upper seat 11 includes an outer peripheral surface, the housing 3 includes an inner peripheral surface corresponding to the upper seat 11, the ventilation channel includes a cavity 61 defined by the outer peripheral surface of the upper seat 11 and the inner peripheral surface of the housing 3, at least one ventilation slot 62 formed on the upper seat 11 or the housing 3, and at least one air inlet 63 formed on the housing 3. Wherein, the air exchanging groove 62 is communicated with the liquid storage cavity 4 and the cavity 61, and the air inlet 63 is communicated with the cavity 61 and the outside.

When a user sucks, the air pressure in the atomizing cavity is negative pressure, the air enters the atomizing cavity from the air inlet channel 100, and the control circuit starts the heating sheet to atomize the liquid medium adsorbed in the porous ceramic body. The liquid medium of the porous ceramic body is reduced, and under the action of capillary force, the porous ceramic body sucks oil liquid from the liquid storage cavity 4 and continues to atomize. The liquid medium of stock solution chamber 4 reduces, and the gas space increases, and too big negative pressure appears in stock solution chamber 4 atmospheric pressure, and the air enters into cavity 61 from the air inlet 63 of shell, then gets into stock solution chamber 4 through the groove 62 that breathes in, realizes gas-liquid balance to let the speed of lower liquid and liquid medium by atomizing speed looks adaptation.

As shown in fig. 5, 6 and 7, in the present embodiment, the upper portion of the upper seat 11 includes an inverted circular truncated cone-shaped outer peripheral surface, the housing 3 includes a cylindrical inner peripheral surface, the middle portion of the upper seat 11 is provided with an annular boss 116, the top of the inverted circular truncated cone-shaped outer peripheral surface and the outer peripheral surface of the boss 116 are respectively abutted against the cylindrical inner peripheral surface to form a cavity 61 gradually narrowing toward the ventilation slot 62, and the longitudinal cross section of the cavity is narrow at the top and wide at the bottom.

Referring to fig. 8a-8c, the liquid stored in the liquid storage chamber 4 entering the cavity 61 through the air exchange groove 62 is absorbed on the top of the inverted V shape due to the capillary force, so as to be stored in the cavity 61. When the user sucks, the liquid in the reservoir chamber 4 is reduced, the air pressure is reduced, and the tobacco tar adsorbed on the top of the inverted V shape flows back into the reservoir chamber 4 from the ventilation groove 62. The inverted V-shaped structure design can prevent the tobacco tar from flowing out of the shell on one hand, and on the other hand, the tobacco tar at the bottom of the cavity 61 can also flow back to the liquid storage cavity 4 along the inverted V-shaped structure. Wherein, a in fig. 8a-8c is the adsorption amount of the tobacco juice adsorbed on the top of the inverted V shape under different conditions, specifically:

fig. 8a shows that when the liquid storage chamber 4 is at the same internal pressure as the external pressure in the resting state, the smoke oil forms an oil film at the air exchange groove 62 to generate tension, so as to lock the liquid, and the liquid is in a vapor-liquid equilibrium state.

Fig. 8b shows that when the external environment changes, for example, external negative pressure occurs, and the internal pressure of the liquid storage chamber 4 is greater than the external pressure in the resting state, the liquid smoke further leaks from the ventilation groove 62 to the cavity 61, and the cavity 61 is in an inverted V-shaped structure, so that the liquid smoke is drawn by the maximum capillary force and the maximum tension at the top gap of the cavity 61, thereby achieving the liquid locking function. And the capillary force and the tension which go downwards are smaller to draw the tobacco tar until the tension is cut off, and then a small part of tobacco juice can be retained on the boss 116, so that the tobacco juice is prevented from flowing out of the air inlet 63 through the boss 116.

Fig. 8c is that when the suction state, the liquid medium of stock solution chamber 4 reduces, and the gas space increases, and too big negative pressure appears in stock solution chamber 4 atmospheric pressure, and when stock solution chamber 4 internal pressure was less than ambient pressure, thereby ambient pressure broke through the tension of the tobacco tar of gas exchange groove 62 department and make outside air get into stock solution chamber 4, the operation of taking a breath is accomplished. Meanwhile, the tobacco tar adsorbed on the top of the inverted V shape can be squeezed back to the liquid storage cavity 4, so that the leaked liquid can be recycled.

In some embodiments, the ventilation groove 62 is opened on the upper housing 11 or the housing 3 where the top of the outer peripheral surface of the inverted circular truncated cone abuts against the inner peripheral surface of the cylindrical shape. In the present embodiment, the ventilation groove 62 is opened in the upper seat body 11 where the top of the outer peripheral surface of the inverted circular truncated cone abuts against the inner peripheral surface of the cylindrical shape. The ventilation groove 62 is provided so that the groove depth gradually decreases toward the cavity 61, and the ventilation groove 61 is sufficiently small to have a capillary force. Preferably, the size of the opening at the top of the aeration tank 61 is 1.0mm by 0.3 mm.

In some embodiments, the air inlet 63 and the air exchanging groove 62 are arranged up and down and are staggered in the circumferential direction. Preferably, in the present embodiment, in order to further prevent the smoke liquid from flowing out of the air inlet 63, the air inlet 63 and the ventilation groove 62 are arranged opposite to each other in the circumferential direction, and the liquid medium enters the ventilation groove 62 and flows out of the air inlet 63, and a half-cycle distance is required for flowing, so that the smoke liquid can be prevented from flowing out to the maximum extent.

In the present embodiment, when the housing 3 is sleeved on the lower seat 10, the clamping portion 118 of the lower seat 10 is clamped in the air inlet 63 to form an air inlet gap, and the air inlet gap is communicated with the cavity 61. In the present embodiment, when the boss 116 is opposite to the air inlet 63, an air inlet groove 62 communicating with the cavity 61 may be formed at the boss 116, and the air inlet groove 62 communicates with the air inlet 63 or the air inlet gap.

The utility model discloses a design a passageway of taking a breath, include: an air inlet communicated with the outside; a cavity communicated with the air inlet; the air exchange groove is communicated with the cavity and the liquid storage cavity, so that the liquid storage cavity is communicated with the outside, air is supplied to the liquid storage cavity, air-liquid balance is realized, and liquid discharging of the liquid storage cavity is smoother. And the cavity is annular or a part of the annular, and one end of the cavity close to the air exchange groove has capillary force, so that liquid locking in a resting state and leakage recovery in a suction state are realized.

In addition, referring to fig. 3 and 4, in the present embodiment, the lower seat 10 is provided with an air inlet passage 100 communicating with the outside. The lower housing 10 includes a cylindrical housing having an inner cavity for receiving the lower portion of the upper housing 11. In this embodiment, the inner cavity of the lower seat 10 is divided by a vertically installed partition plate 101, the two side wall surfaces of the partition plate 101 are respectively provided with positive and negative pole pieces penetrating through the bottom wall of the lower seat 10, and the lower portion of the upper seat 11 has a cross-shaped groove. The first groove 119 is inserted into and matched with the partition 101 to clamp the upper seat 11 on the lower seat 10. The air inlet passage 100 may include a pair of air inlets formed on the sidewalls of the lower housing 10 and a cavity formed between the second groove 120 and the inner cavity of the lower housing 10 when the upper housing 11 is embedded in the lower housing 10.

In this embodiment, the atomizing assembly 2 is supported in the upper housing 11. The upper seat body 11 may be an inverted circular truncated cone with an inner cavity, and a supporting portion 121 for supporting the bottom edge of the atomizing assembly 2 is disposed at the upper portion of the inner cavity of the upper seat body 11. The upper base body 11 may include a bottom wall 110, at least one air inlet hole 111 penetrating through the bottom wall 110 near an edge, an air flow collecting cavity 112 disposed in the middle of the bottom wall 110 for collecting and guiding out a mixture of air and mist overflowing from the atomizing surface, and a flow guide channel 113 extending from the air inlet hole 111 along an inner wall surface of the upper base body 11 for a distance and communicating with the air flow collecting cavity 112. Wherein, the air inlet hole 111 is communicated with the second groove 120 at the lower part of the upper seat body 11, thereby communicating with the air inlet channel 100.

As shown in fig. 5 and 6, in some embodiments, the bottom wall 110 of the upper seat 11 is provided with a section of arc-shaped wall 114 extending from the inner wall surface of the upper seat 11 to the middle of the bottom wall along the inward common tangential direction of the air inlet 111, a flow guiding channel 113 is defined between the arc-shaped wall 114 and the inner wall surface of the upper seat 11, and the flow guiding channel 113 corresponds to the atomizing surface of the atomizing assembly 2, so that the mist overflowing from the atomizing surface is mixed with the air from the outside through the flow guiding channel 113, and thus the flow guiding channel 113 forms the atomizing chamber of the atomizer. And, an airflow collecting chamber 112 having a diversion opening 115 is formed between the wall bodies 114 at the middle of the bottom wall, and the diversion passage 113 is communicated with the airflow collecting chamber 112 through the diversion opening 115. In some embodiments, there is a gap between the wall 114 at the air inlet hole 111 and the atomization surface, so as to avoid the contact between the atomization surface and the wall 114 and the overheating of the wall 114.

In this embodiment, the upper housing 11 includes two opposite air inlets 111 penetrating the edge of the bottom wall 110, and extends from the inner wall surface of the upper housing 11 to the central circle of the bottom wall 110 along the internal common tangential direction of the air inlets 111 to form two segments of arc-shaped walls 114, two flow guiding channels 113 are defined between the two segments of arc-shaped walls 114 and the inner wall surface of the upper housing 11, and the two segments of arc-shaped walls 114 form a cylindrical air flow converging cavity 112 with two opposite flow guiding ports 115 around the central circumference of the bottom wall 110. In some embodiments, the upper housing 11 is made of soft material such as silicon, and the lower housing 10 is made of hard material such as metal or plastic.

Referring to fig. 2 and fig. 7 together, the atomizing assembly 2 in this embodiment may include an atomizing core 20 supported in the upper seat 11, a first air outlet channel 21 longitudinally penetrating through the atomizing core 20, and a heat generating plate 22 disposed at the bottom of the atomizing core 20. In this embodiment, the first air outlet channel 21 in the atomizing core 20 is connected to the air flow collecting cavity 112 in an air guiding manner, the atomizing core 20 is an annular porous ceramic body, and is supported on the supporting portion 121 at the upper portion of the inner cavity of the upper seat body 11, the bottom of the atomizing core 20 that is not in contact with the upper seat body 11 is provided with an annular heat generating sheet, the annular heat generating sheet penetrates through the bottom wall 110 of the upper seat body 11 through a connecting pipe, and is electrically connected to the positive and negative plates on the lower seat body 10, and the positive and negative plates are connected to an external power supply device to generate heat, so as to atomize the liquid medium.

As shown in the figure, in the present embodiment, the housing 3 is sleeved on the upper seat 11 and the lower seat 10, the liquid storage cavity 4 is defined between the housing 3 and the upper seat 11, and the housing 3 is engaged with the lower seat 10. In this embodiment, a clamping portion 118 is disposed on a side wall of the lower seat 10, and cooperates with a clamping hole on the housing 3, so as to fix the housing 3 on the lower seat 10 in a sleeved manner, and in this embodiment, the clamping hole may be the air inlet 63. And a second air outlet channel 30 which is connected with the first air outlet channel 21 of the atomizing assembly 2 in an air guiding way is also arranged in the shell 3, and the two air outlet channels form a complete air outlet channel. The utility model discloses a flue gas transfer passage collects chamber 112, first air outlet channel 21 and second air outlet channel 30 including inlet channel 100, inlet port 111, water conservancy diversion passageway 113, the air current that communicates according to the preface.

In the present embodiment, the atomizer may further include a sealing member 5, and one end of the sealing member 5 is embedded in the first air outlet channel 21 of the atomizing assembly 2, abuts against the wall body 114 at the middle portion of the bottom wall 110 of the upper seat 11, i.e. abuts against the wall body 114 forming the air flow collecting cavity 112, and is communicated with the air flow collecting cavity 112. The other end of the sealant 5 is sleeved on the top of the atomizing core 20, is inserted into the second air outlet channel 30 of the housing 3 for air guiding connection, and defines a liquid suction groove 51 with the inner wall surface of the upper seat 11, and the atomizing core 20 sucks the liquid medium in the liquid storage cavity 4 through the liquid suction groove 51. In some embodiments, the seal 5 is a soft material.

Through implementing the utility model discloses, during the user's suction, can make the air follow the inlet port and enter the back, through one section distance back of water conservancy diversion passageway guide air current flow along the atomizing face, collect the air with the mixture of the fog that overflows from the atomizing face and collect the chamber at the air current, then derive to furthest takes the fog out, increases the smog volume that every take out a mouthful of cigarette and bring, improves the satisfaction of suction person.

And, this application guides the air current to flow a section distance back along the atomizing face through the water conservancy diversion passageway, with the air with from the atomizing face after the fog intensive mixing that overflows, collect and collect the chamber at the air current, then derive, can also furthest reduce the formation of condensate, avoid the user to inhale the condensate, promote user's experience.

In a second embodiment, the present invention further provides an electronic atomizer integrated with a battery device, all the above embodiments are applicable to the embodiment of the electronic atomizer integrated with the battery device, and the electronic atomizer includes all the above implementation manners related to the atomizer, which is not repeated herein.

It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. The utility model provides an atomizer, includes atomizing seat (1) and installs casing (3) on atomizing seat (1), atomizing seat (1) with liquid storage chamber (4) are defined out between casing (3), its characterized in that still includes:

the atomizing device comprises at least one clamping hole formed in the shell (3), at least one clamping part (118) arranged on the atomizing base (1) and matched with the clamping hole in a clamping mode, and a ventilation channel communicated with the liquid storage cavity (4);

2. A nebulizer as claimed in claim 1, wherein an air intake gap is formed between the latch aperture and the catch (118).

3. A nebulizer as claimed in claim 1, wherein the ventilation channel comprises:

an air inlet (63) communicating with the outside;

a cavity (61) communicating with the air inlet (63);

the air exchange groove (62) is communicated with the cavity (61) and the liquid storage cavity (4);

wherein the cavity (61) is annular or a part of annular, and one end of the cavity (61) close to the ventilation groove (62) has capillary force.

4. A nebulizer as claimed in claim 3, wherein when liquid in the reservoir (4) overflows into the cavity (61), the end of the cavity (61) near the venting groove (62) captures the liquid by capillary force.

5. The utility model provides an electronic atomization device, includes atomizing seat (1) and installs casing (3) on atomizing seat (1), atomizing seat (1) with liquid storage chamber (4) are defined out between casing (3), its characterized in that still includes:

6. The electronic atomizer device according to claim 5, wherein an air inlet gap is formed between said snap hole and said snap portion (118).

7. The electronic atomization device of claim 5 wherein the ventilation channel comprises:

an air inlet (63) communicating with the outside;

a cavity (61) communicating with the air inlet (63);

8. The electronic atomizer device according to claim 7, wherein when the liquid in the reservoir (4) overflows into the cavity (61), an end of the cavity (61) near the air exchange groove (62) holds the liquid by capillary force.

9. The electronic atomization device of claim 7, further comprising an atomization core (20), wherein the cavity (61) surrounds or partially surrounds the atomization core (20).

10. Electronic atomisation device according to claim 9, characterised in that the longitudinal cross section of the cavity (61) is inverted V-shaped.