RU2800135C1 - Capillary unit for transmission and spraying of liquid and spraying device - Google Patents

Abstract

FIELD: spraying devices.

SUBSTANCE: group of inventions relates to a capillary unit for passing and spraying liquid and a spraying device. The capillary unit for passing and spraying liquid includes a housing and a spray assembly located in the housing; at least one liquid inlet is formed in a side of the spray assembly, and a liquid suction capillary passage in communication with the liquid inlet is formed between the inside of the housing and the side on which the liquid inlet is located; the length direction of the liquid suction capillary passage extends along the height direction of the side on which the liquid inlet is located, and the two opposite ends of the liquid suction capillary passage extend respectively towards the upper side and the lower side of the liquid inlet to suck the liquid into the liquid inlet by capillary action. By placing the liquid suction capillary passage outside the liquid inlet, the liquid outside the spray assembly can be sucked into the liquid inlet by capillary effect, thus the liquid inlet need not be placed at the bottom of the liquid storage tank, thus to prevent fluid leakage. In addition, the liquid at the bottom of the liquid storage tank can be sucked into the liquid inlet by capillary effect, thus avoiding the dry burning problem caused by insufficient liquid supply.

EFFECT: no leakage and no dry burning.

12 cl, 11 dwg

Description

FIELD OF TECHNOLOGY

[0001] The present disclosure generally relates to areas of electronic spraying, and more specifically, to a capillary unit for passing and spraying liquid, as well as to a spray device.

BACKGROUND OF THE INVENTION

[0002] Electronic atomizers currently used in the field of electronic atomization in general can have problems with liquid leakage and insufficient liquid supply in their liquid supply systems. It is difficult to balance the requirement to prevent fluid leakage with the need for heat and atomization. Electronic spray devices are known, for example, from CN 109259313 (01/25/2019, CHINA TOBACCO HUNAN IND CO LTD), CN 110250576 (09/20/2019, SHENZHEN SMOORE CO LTD), CN 105192895 (12/30/2015, SHENZHEN MIKE WE IR CO LTD).

[0003] At present, in order to achieve complete liquid atomization, the liquid inlet of a spray device in the industry is generally located at the bottom of its liquid storage tank. Thus, the pressure of the liquid at the liquid inlet is relatively large, and accordingly the pressure of the liquid passing through the porous material is large, so that the liquid passes through the liquid-permeable porous member rather easily, resulting in the problem of liquid leakage. Liquid leakage can be eliminated by adjusting the pore size and pore density of the porous material. However, as the liquid in the liquid storage tank is sprayed and evaporated, the liquid becomes less and less, and the pressure of the liquid at the liquid inlet decreases accordingly. Thus, the speed of the liquid passing through the porous material and reaching the spray surface is reduced, which causes the problem of insufficient liquid supply and, furthermore, the problem of dry combustion. Both liquid leakage and dry burning greatly affect the user experience.

DISCLOSURE OF THE INVENTION

[0004] Thus, it is an object of the present invention to provide a capillary fluid transmission and atomization unit capable of sucking liquid by capillary effect, and a atomization device having a liquid transmission and atomization capillary unit.

[0005] A capillary unit for passing and spraying liquid, including a housing and a spray assembly located in the housing; wherein at least one liquid inlet is formed in the side of the spray unit, and the liquid suction capillary channel communicating with at least one liquid inlet is formed between the inner side of the casing and the side of the spray unit, on which at least one liquid inlet is located; And

[0006] The length direction of the liquid suction capillary passage extends along the height direction of the side of the spray assembly on which at least one liquid inlet is located, and the two opposite ends of the liquid suction capillary passage extend, respectively, towards the upper side and the lower side of at least one liquid inlet to suck liquid into the at least one liquid inlet due to capillary effect.

[0007] In one embodiment, the casing includes a tubular body with two open opposite ends, and the tubular body is put on and attached to the outer periphery of the spray assembly;

[0008] A side wall of the tubular body corresponding to at least one liquid inlet extends outward relative to the spray assembly to form a convex wall extending along the length direction of the tubular body, and a liquid suction capillary channel is formed between the inner surface of the convex wall and the side of the spray assembly.

[0009] In one embodiment, the outer periphery of the tubular body has a shape that matches the shape of the outer periphery of the spray assembly, and which may be round, polygonal, or oval.

[0010] In one embodiment, the convex wall is provided with a vent in communication with a capillary passage for suction of liquid, and said vent is located above at least one liquid inlet.

[0011] In one embodiment, one end of the casing is closed to form a closed end, and the spray assembly is located on the inner end surface of the closed end;

[0012] the inner wall surface of the housing includes a first wall surface corresponding to a side of the spray assembly, on which at least one liquid inlet is located, and a gap formed between the side of the spray assembly and the first wall surface to form a capillary passage for suction of liquid;

[0013] the other inner wall surfaces of the housing form a second wall surface that is spaced apart from and corresponds to the other sides of the spray assembly; and the space between the other sides of the spray unit and the second wall surface defines a liquid storage cavity and a space communicating with the liquid suction capillary passage.

[0014] In one embodiment, a ledge is formed extending from the first wall surface, and a liquid suction capillary passage is formed between the side of the spray assembly, on which at least one fluid inlet is located, and the ledge.

[0015] In one embodiment, a support base is formed on the inner end surface of the closed end of the casing, and the spray assembly is located on the support base; and between the outer periphery of the support base and the inner wall surface of the case, a space is formed in communication with the liquid storage cavity.

[0016] In one embodiment, the top of the liquid suction capillary passage is flush with or above the top edge of the at least one liquid inlet; and the bottom of the liquid suction capillary passage is located below the at least one liquid inlet.

[0017] In one embodiment, the atomization assembly includes a liquid-permeable element, a sleeve fitted on the liquid-permeable element, and at least one heating element located in the liquid-permeable element, and at least one liquid inlet located in the sleeve;

[0018] An air flow hole is formed in the liquid-permeable element, which passes through two opposite ends of the liquid-permeable element, and the heating element is located on the inner wall surface of the air-flow hole.

[0019] In one embodiment, the heating element includes a heater and two electrode connecting parts connected to one end of the heater at intervals, and the electrode connecting parts extend from one end of the liquid-permeable element for connection to an external power source.

[0020] In one embodiment, the heater is in the form of a sheet or coil, and the electrode connection portion is an electrode lead or electrode contact.

[0021] The present invention also provides a spray device, including the above-mentioned capillary unit for passing and spraying liquid and a liquid storage tank located on the outer periphery of the capillary unit for passing and spraying liquid; and

[0022] the lower part of the liquid suction capillary passage of the liquid passing and spraying capillary unit is located above the lower surface of the liquid storage tank.

[0023] By placing the liquid suction capillary port outside the at least one liquid inlet, the liquid outside the spray assembly can be sucked into the at least one liquid inlet due to the capillary effect, thus at least one liquid inlet does not need to be placed at the bottom of the liquid storage tank, thus preventing liquid leakage. In addition, the liquid at the bottom of the liquid storage tank can be sucked into the at least one liquid inlet by capillary effect, thus avoiding the problem of dry burning caused by insufficient liquid supply.

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be described in more detail with reference to the embodiments and the accompanying drawings, in which:

[0025] in FIG. 1 is a three-dimensional view of a liquid transmission and atomization capillary unit according to the first embodiment of the present invention;

[0026] in FIG. 2 is an exploded view of the liquid transmission and atomization capillary assembly shown in FIG. 1;

[0027] in FIG. 3 is a sectional view of the liquid transmission and atomization capillary assembly shown in FIG. 1, for capillary liquid suction;

[0028] in FIG. 4 is a three-dimensional view of a liquid transmission and atomization capillary unit according to a second embodiment of the present invention;

[0029] in FIG. 5 is an exploded view of the liquid transmission and atomization capillary assembly shown in FIG. 4;

[0030] in FIG. 6 is a three-dimensional view of a liquid transmission and atomization capillary unit according to a third embodiment of the present invention;

[0031] in FIG. 7 is a three-dimensional view of a liquid transmission and atomization capillary unit according to a fourth embodiment of the present invention;

[0032] in FIG. 8 is a sectional side view of the liquid transmission and atomization capillary assembly shown in FIG. 7;

[0033] in FIG. 9 and 10 are sectional views, respectively, of the liquid transmission and atomization capillary unit shown in FIG. 7, in two different vertical directions; And

[0034] in FIG. 11 is a side sectional view of a liquid transmission and atomization capillary unit according to a fifth embodiment of the present invention.

IMPLEMENTATION OF THE INVENTION

[0035] In order to provide a clearer understanding of the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0036] As shown in FIG. 1-3, the capillary unit for passing and atomizing liquid according to the first embodiment of the present invention includes a housing 10 and a spray assembly 20 disposed in the housing 10.

[0037] In the side of the node 20 spray has at least one inlet 200 for liquid. The liquid suction capillary passage 100 is formed between the inside of the case 10 and the side of the spray unit 20, in which the liquid inlet 200 is formed. The length direction of the liquid suction capillary passage 100 extends along the vertical direction of the side of the atomization unit 20 in which the liquid inlet 200 is formed. The liquid suction capillary port 100 communicates with the liquid inlet port 200, and the two opposite ends of the liquid capillary port 100 extend towards the upper side and the lower side of the liquid inlet port 200, respectively, so that liquid is sucked into the liquid inlet port 200 through the liquid suction capillary port 100 by capillary effect. The liquid entering the liquid inlet 200 is then heated and atomized by the atomization unit 20 to form smoke.

[0038] The width d of the liquid suction capillary passage 100 is 0.1 mm to 3 mm. The number of capillary passages 100 for liquid suction corresponds to the number of inlet openings 200 for liquid. For example, when one liquid inlet 200 is formed in one side of the spray unit 20, one liquid suction capillary passage 100 is accordingly formed. When two liquid inlet holes 200 are formed on two opposite sides of the atomization unit 20, respectively, two liquid suction capillary passages 100 corresponding to said two liquid inlet holes 200 are formed.

[0039] In this embodiment, the casing 10 includes a tubular body 11 with two open opposite ends. The tubular body 11 is put on the outer periphery of the spray unit 20 and attached to it.

[0040] A side wall of the tubular body 11 corresponding to the liquid inlet 200 extends outwardly from the atomization unit 20 to form a convex wall 12 extending along the length direction of the tubular body 11. A liquid suction capillary passage 100 is formed between the inner surface of the convex wall 12 and the side of the atomization unit 10.

[0041] The shape of the outer periphery of the tubular body 11 corresponds to the shape of the outer periphery of the spray unit 20, so that the tubular body 11 can closely contact the outer periphery of the spray unit 20. The shapes of the outer periphery of the tubular body 11 and the spray unit 20 may be, among others, a circle, a polygon, an ellipse, and the like. The shape of the convex wall 12 may be, among others, square or arcuate.

[0042] The spray assembly 20 may include a liquid-permeable element 21, a sleeve 22 fitted on the outer periphery of the liquid-permeable element 21, and at least one heating element 23 located in the liquid-permeable element 21.

[0043] The liquid-permeable member 21 is used to suck in the liquid to be sprayed. The fluid-permeable member 21 may be a porous fluid-permeable member made of a porous material, and its cross section may be polygonal, circular, or other shape. In the liquid-permeable member 21, an air flow hole 210 is formed which extends through two opposite ends thereof, and a heating element 23 is disposed on the inner wall surface of the air flow hole 210. The liquid is heated and atomized by the heating element 23 to form smoke, and the smoke exits through the air flow hole 210 .

[0044] The sleeve 22 fitted on the outer periphery of the fluid-permeable member 21 functions as a structural support and insulation. The liquid inlet 200 is disposed on the sleeve 22. A protrusion 211 corresponding to the liquid inlet 200 may be formed on the side of the liquid passage member 21 so that the liquid passage member 21 can suck liquid better and faster.

[0045] The heating element 23 may be attached to or built into the inner wall surface of the air flow hole 210 and one end of the heating element 23 extends from one end of the fluid-permeable element 21 for connection to an external power source. The heating element 23 may include a heater 231 and two electrode connecting parts 232 spaced apart and connected to one end of the heater 231. The electrode connecting parts 232 extend from the end of the fluid-permeable member 21 for connection to an external power source, and the two electrode connecting parts 232 are configured to be connected to the positive and negative poles of the power source, respectively.

[0046] The heater 231 may be in the form of a sheet or a coil, and the electrode connecting portion 232 may be an electrode terminal or an electrode contact. As shown in FIG. 2, in this embodiment, the heater 231 is a coiled heating tube, and the electrode connecting portion 232 is an electrode lead that extends from one end of the heating tube or is welded to the end of the heating tube.

[0047] In addition, in this embodiment, the length of the sleeve 22 exceeds the length of the liquid-permeable element 21, so that the entire liquid-permeable element 21 can be accommodated in the sleeve 22. The length of the sleeve 22 also exceeds the length of the casing 10, and the casing 10 is put on the outer periphery of the sleeve 22 corresponding to the fluid inlet 200. The top of the casing 10 is flush with or above the top edge of the liquid inlet 200 such that the top of the liquid suction capillary 100 is flush with or above the top edge of the liquid inlet 200. The lower part of the case 10 is located below the liquid inlet 200 so that the lower part of the liquid capillary passage 100 is located below the liquid inlet 200, thus, through the opening in the lower part of the liquid capillary passage 100, the liquid below the liquid inlet 200 can be sucked and lifted to the liquid inlet 200, and the liquid entering the inlet 200 for liquid, is additionally sucked in by the liquid-permeable element 21.

[0048] As shown in FIG. 3, in the case of the liquid transmission and atomization capillary unit according to the present embodiment, the liquid storage tank 300 of the atomization device is located on the outer periphery of the liquid transmission and atomization capillary unit in the atomization apparatus. The liquid inlet 200 on the spray assembly 20 need not be located at the bottom of the liquid storage tank 300, but may be located at an intermediate position or elsewhere in the liquid storage tank 300. The lower part of the liquid suction capillary passage 100 is located in the liquid storage tank 300, i. e. the bottom of the liquid suction capillary passage 100 is located above the bottom surface of the liquid storage tank 300 . During operation of the atomizing device, liquid from the liquid storage tank 300 is sucked into the liquid suction capillary passage 100, and then enters the liquid passage member 21 through the liquid inlet 200.

[0049] As shown in FIG. 4 and 5, the capillary unit for passing and atomizing liquid according to the second embodiment of the present invention includes a housing 10 and a spray assembly 20 disposed in the housing 10.

[0050] Wherein, at least one liquid inlet 200 is formed in the side of the spray unit 20, a liquid suction capillary passage 100 is formed between the inside of the casing 10 and the side of the spray unit 20 on which the liquid inlet 200 is located. The length direction of the liquid suction capillary passage 100 is parallel to the height direction of the side of the spray unit 20 on which the liquid inlet 200 is located. The liquid suction capillary port 100 communicates with the liquid inlet port 200, and two opposite ends of the liquid capillary port 100 extend towards the upper side and the lower side of the liquid inlet port 200, respectively, so that liquid can be sucked into the liquid inlet port 200 through the capillary liquid suction port 100 by capillary effect. The liquid entering the liquid inlet 200 is then heated and atomized by the atomization unit to generate smoke.

[0051] The casing 10 includes a tubular body 11 with two open opposite ends, and the tubular body 11 is put on and attached to the outer periphery of the spray assembly 20. The side wall of the tubular body 11, corresponding to the liquid inlet 200, extends outward relative to the spray assembly 20, forming a convex wall 12 extending along the length direction of the tubular body 11. A liquid suction capillary passage 100 is formed between the inner surface of the convex wall 12 and the side of the spray assembly 10, on which the liquid inlet 200 is located.

[0052] The spray assembly 20 includes a liquid-permeable element 21, a sleeve 22 fitted on the outer periphery of the liquid-permeable element 21, and at least one heating element 23 located in the liquid-permeable element 21.

[0053] In this embodiment, the detailed arrangement of the casing 10 and the liquid suction capillary passage 100, the manner of interaction between the sleeve 22 and the liquid-permeable member 21, etc. may be the same as the above first embodiment and will not be repeated herein.

[0054] An air flow hole 210 is formed in the fluid-permeable member 21 passing through two opposite ends of the fluid-permeable member 21. The heating element 23 may be attached to or embedded in an inner wall surface of the air-flow hole 210. One end of the heating element 23 extends from one end of the liquid-permeable element 21 to be connected to an external power source. The fluid-permeable member 21 may include one or more airflow holes 210, and a plurality of airflow holes 210 may be spaced apart from each other. The spray assembly 30 may include one or more heating elements 23. A plurality of heating elements 23 may be independently mounted, respectively, on the inner wall surface of each air flow hole 210, or may be mounted on the inner wall surfaces on the same side of the plurality of air flow holes 210, crossing the plurality of air flow holes 210 in the transverse direction.

[0055] The heating element 23 may include a heater 231 and two electrode connecting portions 232 connected to one end of the heater 231 at intervals. Electrode connecting parts 232 extend from one end of the fluid-permeable member 21 to connect to an external power supply, and the two electrode connecting parts 32 correspond to the positive and negative poles of the power supply.

[0056] The difference between the second embodiment and the first embodiment is that the heater 231 according to the second embodiment is sheet-shaped, and if necessary, through holes can also be formed in the sheet-shaped heating element 231 to form a hollow sheet. The electrode connection portion 232 may be an electrode lead as shown in FIG. 5, or may be an electrode contact connected to or formed on the heating element 231.

[0057] The liquid transmission and atomization capillary unit according to the present embodiment can be used in the atomization device, and the method of liquid capillary transmission in the atomization device is the same as in the above-mentioned first embodiment shown in FIG. 3 and is illustrated in the corresponding description of the above first embodiment.

[0058] In addition, in the above first embodiment, the outer periphery of the spray unit 20 may be round as shown in FIG. 1 and 2, or may have a different shape, such as a square. The outer periphery of the spray unit 20 in the second embodiment may be square, as shown in FIG. 4 and 5, or has a different shape, such as round.

[0059] As shown in FIG. 6, the capillary unit for passing and atomizing liquid according to the third embodiment of the present invention includes a housing 10 and a spraying assembly 20 located in the housing 10. The difference of the third embodiment from the above-mentioned first and second embodiments is that the convex wall 12 of the tubular body 11 is provided with a vent hole 130 communicating with the capillary passage 100 for sucking liquid. The number of vents 130 may be one or more. In the vertical direction, the vent 130 is located above the liquid inlet 200. The vent hole 130 may be positioned so as to prevent air from escaping from the liquid suction capillary passage 100, resulting in the liquid not being well absorbed by the air pressure capillary effect.

[0060] As shown in FIG. 7-10, the capillary unit for passing and atomizing liquid according to the fourth embodiment of the present invention includes a case 10 and a spray assembly 20 disposed in the case 10.

[0061] In this case, at least one liquid inlet 200 is formed in the side of the spray unit 20, and the liquid suction capillary passage 100 is formed between the inside of the casing 10 and the side of the spray unit 20, on which the liquid inlet 200 is located. The length direction of the liquid suction capillary passage 100 extends along the vertical direction of the side of the atomization unit 20 in which the liquid inlet 200 is formed. The liquid suction capillary passage 100 communicates with the liquid inlet 200, and the two opposite ends of the liquid suction capillary passage 100 extend towards the upper side and the lower side of the liquid inlet 200, respectively, so that liquid can be sucked into the liquid inlet 200 by capillary effect. The liquid entering the liquid inlet 200 is then heated and atomized by the atomization unit 20 to generate smoke.

[0062] The width d of the liquid suction capillary passage 100 is 0.1 mm to 3 mm. The number of capillary passages 100 for liquid suction corresponds to the number of inlet openings 200 for liquid.

[0063] In this embodiment, the housing 10 has a generally tubular structure, one end of which is closed to form a closed end 110, and the spray assembly 20 is located on the inner end surface of the closed end 110. The outer periphery of the spray assembly 20 does not contact the inner wall surface of the housing 10.

[0064] In particular, the inner wall surface of the case 10 includes a first wall surface 101 corresponding to the side of the spray unit 20 on which the liquid inlet 200 is located. A gap is formed between the side of the spray unit 20 and the first wall surface 101, and a liquid suction capillary passage 100 is formed between the side of the spray unit 20 and the first wall surface 101. The first wall surface 101 may be a flat surface or a surface having the same shape as the side of the spray assembly 20, such as a curved surface or a flat surface.

[0065] The other inner wall surfaces of the case 10 form a second wall surface 102 corresponding to and spaced apart from the other sides of the spray assembly 20; the space between the other sides of the spray unit 20 and the second wall surface 102 forms a liquid storage cavity 103, and the liquid storage cavity 103 communicates with the liquid suction capillary passage 100.

[0066] In addition, the support base 120 is located on the inner end surface of the closed end 110 of the casing 10, and the spray assembly 20 is located on the support base 120. A space 104 is formed between the outer periphery of the support base 120 and the inner wall surface of the casing 10, and the space 104 communicates with the liquid storage cavity 103.

[0067] A through hole 105 is formed in the closed end 110 and the support base 120, and passes through two opposite ends of the support base 120 and the closed end 110. The through hole 105 is connected to and communicates with the air flow hole 210 of the spray assembly 20.

[0068] The spray assembly 20 in this embodiment may be the same as the spray assembly 20 in the aforementioned first embodiment or second embodiment, and its description will not be repeated here. In this case, the lower end of the sleeve 22 of the spray assembly 20 can be put on the upper end of the support base 120 and can be tightly connected to the support base 120.

[0069] As shown in FIG. 11, the capillary unit for passing and atomizing liquid according to the fifth embodiment of the present invention includes a housing 10 and a spraying unit 20 located in the housing 10. The housing 10, the spraying unit 20, the liquid suction capillary passage 100, and so on. are the same as in the fourth embodiment described above, and their description will not be repeated here.

[0070] The difference between the fifth embodiment and the aforementioned fourth embodiment is that a ledge 106 is formed on the first wall surface 101 of the case 10, and a capillary passage 100 is formed between the ledge 106 and the side of the atomization unit 20, on which the liquid inlet 200 is located, for suction of the liquid. The surface of the ledge 106 may be flat or may have the same shape as the side of the spray assembly 20, such as a curved surface or a flat surface.

[0071] In the fourth and fifth embodiments described above, the liquid suction capillary passage 100 is mainly formed between two surfaces, and at least three surfaces of the liquid suction capillary passage 100 are open and communicate with the liquid storage cavity 103 such that liquid suction can occur through these three open surfaces of the liquid suction capillary passage 100 by capillary effect.

[0072] With reference to FIG. 3, the atomizing device according to the present disclosure includes a liquid passing and atomizing capillary unit and a liquid storage tank 300 disposed at the outer periphery of the liquid passing and atomizing capillary unit.

[0073] In one embodiment, the capillary assembly for passing and spraying liquid is the assembly shown in FIG. 1, FIG. 4 or FIG. 6. In this embodiment, the atomizing device also includes a sheath, a capillary unit for passing and atomizing liquid is located in the sheath, a liquid storage reservoir 300 is formed between the sheath and a capillary unit for passing and atomizing liquid, and the liquid storage reservoir may be annular.

[0074] In yet another embodiment, the capillary unit for passing and spraying liquid is the unit shown in FIG. 7 or FIG. 11. In this embodiment, the housing 10 of the capillary for passing and atomizing the liquid forms the shell of the spray device, and the liquid storage cavity 103 of the capillary for passing and atomizing the liquid forms the reservoir 300 for storing the liquid of the spray device.

[0075] During operation of the atomizing device, liquid from the liquid storage tank 300 is sucked into and into the liquid suction capillary passage 100, and then enters the liquid passage member 21 through the liquid inlet 200. The heating element 23 is energized to generate heat and sprays the liquid passed to the heating element 23 to generate smoke. The smoke exits the atomizing device through the air flow opening 210 .

[0076] The above are only some of the embodiments of the present invention, which do not limit the scope of the patent of the present disclosure. Any equivalent construction or equivalent transformation of the procedure made using the present description and the present images appended to this disclosure, directly or indirectly using the present description and these images annexed to this disclosure, in other relevant technical fields, is within the scope of patent protection of the present invention.

Claims (12)

1. A capillary block for passing and spraying liquid, containing a casing (10) and a spray assembly (20) located in the casing (10); wherein at least one inlet (200) for liquid is formed in the side of the node (20) spray, and the capillary channel (100) for suction of liquid, communicating with at least one inlet (200) for liquid, is formed between the inner side of the casing (10) and the side of the node (20) spray, which is located at least one inlet (200) for liquid; and the length direction of the liquid suction capillary channel (100) runs along the height direction of the side of the spray assembly (20) on which at least one liquid inlet (200) is located, and the two opposite ends of the liquid suction capillary channel (100) extend, respectively, towards the upper side and the lower side of at least one liquid inlet (200) for suction of the liquid into at least one liquid inlet (200) due to the capillary effect . 2. The capillary unit for passing and spraying liquid according to claim 1, in which the casing (10) contains a tubular body (11) with two open opposite ends, and the tubular body (11) is put on the outer periphery of the spray assembly (20) and attached to it; the side wall of the tubular body (11), corresponding to at least one inlet (200) for the liquid, extends outward relative to the spraying unit (20), forming a convex wall passing along the length direction of the tubular body (11), and the capillary channel (100) for suction of the liquid is formed between the inner surface of the convex wall (12) and the side side of the spraying unit (20). 3. A capillary block for passing and spraying liquid according to claim 2, in which the outer periphery of the tubular body (11) has a shape that corresponds to the shape of the outer periphery of the spray assembly (20), which can be round, polygonal or oval. 4. The capillary block for passing and spraying liquid according to claim 2, in which the convex wall (12) is provided with a vent (130) communicating with the capillary channel (100) for suction of liquid, and said vent (130) is located above at least one inlet (200) for liquid. 5. The capillary block for passing and spraying liquid according to claim 1, in which one end of the casing (10) is closed to form a closed end (110), and the spray assembly (20) is located on the inner end surface of the closed end (110); the inner wall surface of the casing (10) contains the first surface (101) of the wall corresponding to the side side of the spraying unit (20), on which at least one inlet (200) for liquid is located, and a gap is formed between the side of the spraying unit (20) and the first wall surface (101) with the formation of a capillary channel (100) for liquid suction; other inner wall surfaces of the casing (10) form a second wall surface (102), which is located at a distance from the other sides of the spray assembly (20) and corresponds to them; and the space between the other sides of the spray assembly (20) and the second wall surface (102) forms a liquid storage cavity (103) communicating with the liquid suction capillary channel (100). 6. A capillary block for passing and spraying liquid according to claim 5, in which a ledge (106) is formed extending from the first surface (101) of the wall, and a capillary channel (100) for suction of liquid is formed between the side of the spray assembly (20), on which at least one inlet (200) for liquid is located, and the ledge (106). 7. A capillary block for passing and spraying liquid according to claim 5, in which a support base (120) is formed on the inner end surface of the closed end (110) of the casing (10), and the spray assembly (20) is located on the support base (120); and between the outer periphery of the support base (120) and the inner wall surface of the casing (10), a space (104) is formed in communication with the liquid storage cavity (103). 8. The capillary unit for passing and spraying liquid according to claim 1, in which the upper part of the capillary channel (100) for suction of liquid is flush with the upper edge of at least one inlet (200) for liquid or above it; and the lower part of the liquid suction capillary channel (100) is located below at least one liquid inlet (200). 9. Capillary block for passing and spraying liquid according to any one of paragraphs. 1-8, in which the spray assembly (20) comprises a liquid-permeable element (21), a sleeve (22) fitted on the liquid-permeable element (21), and at least one heating element (23) located in the liquid-permeable element (21), and at least one liquid inlet (200) is located in the sleeve (22); in the liquid-permeable element (21), an air-flow hole (210) is formed, which passes through two opposite ends of the liquid-permeable element (21), and the heating element (23) is located on the inner surface of the wall of the air-flow hole (210). 10. The capillary unit for passing and spraying liquid according to claim 9, in which the heating element (23) contains a heater (231) and two connecting (232) parts of the electrodes connected to one end of the heater (231) at intervals, and the connecting parts (232) of the electrodes come out of one end of the liquid-transmitting element (21) for connection to an external power source. 11. The capillary fluid transmission and atomization unit of claim 10, wherein the heater (231) is in the form of a sheet or coil and the electrode connection (232) is an electrode lead or electrode contact. 12. A spray device containing a capillary unit for passing and spraying liquid according to any one of paragraphs. 1-11 and a liquid storage tank (300) located on the outer periphery of the capillary unit for passing and spraying liquid; wherein the lower part of the liquid suction capillary channel (100) of the liquid passing and spraying capillary unit is located above the lower surface of the liquid storage tank (300).