A mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area

Abstract

The present invention discloses a mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area, comprising a nozzle housing, a nozzle holder, a nozzle valve core and an elastic member. The nozzle housing comprises a first cavity, a liquid inlet and a spray hole; the nozzle holder is arranged in the first cavity, and comprises a second cavity and a first through hole connected to the first cavity; the nozzle valve core comprises a main body and a tapered portion, the main body is at least partially arranged in the second cavity, and can move along the axial direction of the second cavity, the radial dimension of the lower part of the tapered portion is smaller than the radial dimension of the spray hole, so that the main body can drive the lower part of the tapered portion to move in the spray hole to adjust the flow cross-sectional area of ​​the spray hole; the elastic member is arranged between the other end of the main body and the nozzle holder in the axial direction, and is used to apply an elastic force to the main body toward the spray hole in the axial direction. According to the mechanical atomizing nozzle of the present invention, the flow cross-sectional area of ​​the spray hole can be automatically adjusted according to the flow rate of the liquid to be atomized, the adjustment range is large, and the adaptability to load changes is strong.

Description

Technical Field

[0001] The invention relates to the field of mechanical equipment, and in particular to a mechanical atomizing nozzle with a spray hole cross-sectional area capable of self-adjustment. Background Art

[0002] Mechanical atomizing nozzle is one of the effective ways to achieve liquid atomization. It mainly relies on the high-speed jet or swirl generated by the liquid working medium under the action of a high pressure difference to break the liquid into fine droplets. It has the advantages of simple structure, low power consumption and high atomization efficiency. Therefore, it is widely used in fuel burners, pesticide spraying, coal mine spray dust reduction and thermal power equipment deoxygenation and cooling.

[0003] Most of the existing mechanical atomizing nozzles are fixed cross-section nozzles, that is, the nozzle outlet cross-sectional area is fixed. This type of nozzle has a rated inlet pressure and inlet flow rate. Only when the rated inlet pressure is reached can good atomization quality be guaranteed. Under low inlet pressure conditions, the atomization effect of the nozzle is not ideal. When increasing the inlet pressure to increase the spray volume, it is often necessary to increase the inlet pressure by a large amount to obtain a small increase in the inlet pressure, resulting in a very limited adjustment range for this type of nozzle.

[0004] To this end, the present invention provides a mechanical atomizing nozzle with a self-adjustable spray hole cross-sectional area to at least partially solve the above-mentioned problem. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the present invention provides a mechanical atomizing nozzle with a self-adjustable spray hole cross-sectional area, comprising:

[0007] A nozzle housing, the nozzle housing comprising a first cavity and a liquid inlet and a spray hole both connected to the first cavity, the first cavity being used to contain liquid to be atomized;

[0008] a nozzle holder, the nozzle holder being arranged in the first cavity and comprising a second cavity and a first through hole, the first through hole being arranged outside the second cavity and communicating with the first cavity;

[0009] A nozzle valve core, the nozzle valve core comprising a main body and a tapered portion arranged at one end of the main body, the main body at least partially arranged in the second cavity and capable of moving along the axial direction of the second cavity, the radial dimension of the lower portion of the tapered portion being smaller than the radial dimension of the spray hole, the tapered portion being used to bear and transmit the pressure of the liquid to be atomized, so that the main body can move along the axial direction, so as to drive the lower portion of the tapered portion to move in the spray hole, thereby adjusting the flow cross-sectional area of ​​the spray hole;

[0010] An elastic member is disposed between the other end of the main body and the nozzle holder along the axial direction, and is used to apply an elastic force toward the spray hole to the main body along the axial direction.

[0011] According to the mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area of ​​the present invention, the nozzle housing includes a first cavity and a liquid inlet and a spray hole both connected to the first cavity, so that the liquid to be atomized can enter the first cavity through the liquid inlet and be sprayed out through the spray hole to form atomized liquid; the nozzle holder is arranged in the first cavity, and includes a second cavity and a first through hole, the first through hole is arranged on the outside of the second cavity and connected to the first cavity, so that the liquid to be atomized can flow through the first through hole to the part of the first cavity close to the spray hole; the nozzle valve core includes a main body and a tapered portion arranged at one end of the main body, the main body is at least partially arranged in the second cavity, and can move along the axial direction of the second cavity, the liquid to be atomized in the first cavity can apply a certain pressure to the tapered portion, the tapered portion is used to bear and transmit the pressure of the liquid to be atomized, and under the action of the above pressure, the main body can move along the axial direction of the second cavity; the radial size of the lower part of the tapered portion is smaller than the radial size of the spray hole, so that when the main body moves along the axial direction of the second cavity, it can drive the lower part of the tapered portion to move in the spray hole. The nozzle moves in the hole, thereby adjusting the flow cross-sectional area of ​​the nozzle; and the change in the flow cross-sectional area of ​​the nozzle corresponds to the change in the flow rate of the liquid to be atomized in the first cavity, that is, the flow cross-sectional area of ​​the nozzle is automatically adjusted as the flow rate of the liquid to be atomized in the first cavity changes, that is, the flow cross-sectional area of ​​the nozzle is automatically adjusted as the inlet pressure of the liquid to be atomized changes, which can reduce the pressure difference on both sides of the nozzle with the change in the flow rate of the liquid to be atomized, and ensure the atomization effect while making the mechanical atomizing nozzle have a larger adjustment range, which is conducive to improving the adaptability of the mechanical atomizing nozzle to changes in operating loads; the elastic member is arranged between the other end of the main body and the nozzle holder along the axial direction of the second cavity, and is used to apply an elastic force to the main body toward the nozzle along the axial direction of the second cavity, so that when no liquid to be atomized flows into the first cavity, the main body of the nozzle valve core can move toward the nozzle along the axial direction of the second cavity under the action of the elastic force, so that the tapering portion can close the nozzle, and avoid the residual liquid to be atomized from leaking out of the nozzle when the relevant device is parked or jumped.

[0012] Optionally, the tapered portion is configured as a conical portion, and a conical angle α of the conical portion satisfies: 50°≤α≤100°.

[0013] Optionally, the lower portion of the first cavity is configured as a conical cavity, a conical angle β of the conical cavity is greater than a conical angle α of the conical portion, and a difference δ between β and α satisfies: 20°≤δ≤40°.

[0014] Optionally, the spray hole is a Venturi hole.

[0015] Optionally, the other end of the main body is provided with a first limiting groove, the nozzle holder includes a second limiting groove corresponding to the first limiting groove, and the elastic member is at least partially located in the first limiting groove and the second limiting groove.

[0016] Optionally, the nozzle valve core further comprises a valve stem and a fastener, wherein the valve stem is arranged at the other end of the main body and extends through the nozzle frame, and the fastener is arranged on a portion of the valve stem extending beyond the nozzle frame.

[0017] Optionally, it further comprises a first sealing member, which is arranged between the body portion and the nozzle holder along the radial direction of the second cavity, and along the axial direction, the first sealing member is adjacent to a side of the elastic member close to the spray hole;

[0018] and / or,

[0019] The invention also includes a second sealing member, which is arranged between the valve stem and the nozzle holder along the radial direction of the second cavity, and is adjacent to a side of the elastic member away from the spray hole along the axial direction.

[0020] Optionally, an atomizing element is further included, wherein the atomizing element is connected to the end of the tapered portion and is located outside the spray hole.

[0021] Optionally, a filter element is further included, which is connected to the nozzle housing and is arranged at the liquid inlet.

[0022] Optionally, a protective cover is further included, wherein the protective cover is arranged at a position of the nozzle rack close to the valve stem, and a portion of the valve stem extending beyond the nozzle rack is located within the protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0024] In the attached figure:

[0025] Figure 1 It is a schematic structural diagram of an atomizing nozzle with a self-adjustable spray hole cross-sectional area according to a preferred embodiment of the present invention, wherein the spray hole is in a closed state;

[0026] Figure 2 Another structural schematic diagram of an atomizing nozzle with a self-adjustable spray hole cross-sectional area according to a preferred embodiment of the present invention, wherein the spray hole is in an open state;

[0027] Figure 3 A schematic structural diagram of an atomizing element of an atomizing nozzle with a self-adjustable spray hole cross-sectional area according to a preferred embodiment of the present invention; and

[0028] Figure 4 It is a schematic structural diagram of an atomizing component of an atomizing nozzle with self-adjustable spray hole cross-sectional area according to another preferred embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 100: Mechanical atomizing nozzle 110: Nozzle housing

[0031] 111: First cavity 112: Liquid inlet

[0032] 113: spray hole 114: first side wall

[0033] 115: bottom wall 116: first limiting portion

[0034] 120: nozzle holder 121: second cavity

[0035] 122: first through hole 123: second side wall

[0036] 124: top wall 125: protrusion

[0037] 126: second limiting groove 127: second groove

[0038] 130: Nozzle valve core 131: Body

[0039] 132: Gradual shrinkage 133: First limiting groove

[0040] 134: Valve stem 135: Fastener

[0041] 136: first groove 140: elastic member

[0042] 151: first seal 152: second seal

[0043] 160 / 260: Atomizer 161: Connecting rod

[0044] 162: Connecting part 163 / 263: Atomizing teeth

[0045] 170: filter element 171: second limiting portion

[0046] 180: Protective cover DETAILED DESCRIPTION

[0047] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0048] In order to fully understand the present invention, a detailed structure will be presented in the following description to illustrate the present invention. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments and should not be construed as being limited to the embodiments presented here.

[0049] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. The singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. The terms "upper", "lower", "front", "back", "left", "right" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

[0050] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0051] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings. These drawings show representative embodiments of the present invention and do not limit the present invention.

[0052] refer to Figure 1 and Figure 2 According to a preferred embodiment of the present invention, a mechanical atomizing nozzle 100 with a self-adjustable cross-sectional area of ​​a spray hole 113 includes a nozzle housing 110 , a nozzle holder 120 , a nozzle valve core 130 and an elastic member 140 .

[0053] The nozzle housing 110 includes a first cavity 111, a liquid inlet 112 and a spray hole 113. The liquid inlet 112 and the spray hole 113 are both connected to the first cavity 111, and the liquid to be atomized can enter the first cavity 111 through the liquid inlet 112 and be sprayed out through the spray hole 113 to form atomized liquid.

[0054] Specifically, the nozzle housing 110 may include a first side wall 114 and a bottom wall 115. The first side wall 114 is connected to the bottom wall 115 and extends from the periphery of the bottom wall 115 along the axial direction of the nozzle housing 110. The first side wall 114 and the bottom wall 115 together form a first cavity 111. The top of the first side wall 114 is open to form a liquid inlet 112. The spray hole 113 is provided on the bottom wall 115, such as being provided in the middle of the bottom wall 115. The center line of the spray hole 113 preferably coincides with the center line of the first cavity 111.

[0055] The nozzle holder 120 is connected to the nozzle housing 110 and is disposed in the first cavity 111. The nozzle holder 120 is preferably disposed coaxially with the nozzle housing 110. The nozzle holder 120 includes a second cavity 121 and a first through hole 122. The first through hole 122 is disposed outside the second cavity 121 and communicates with the first cavity 111. After the atomized liquid flows into the first cavity 111 from the liquid inlet 112, it can continue to flow to the portion of the first cavity 111 close to the nozzle hole 113 through the first through hole 122.

[0056] Specifically, the nozzle holder 120 may include a second side wall 123 and a top wall 124. The second side wall 123 is connected to the top wall 124 and extends from the periphery of the top wall 124 along the axial direction of the nozzle holder 120. The second side wall 123 and the top wall 124 together enclose a second cavity 121.

[0057] The portion of the second side wall 123 close to the top wall 124 has a protrusion 125 extending in the radial direction of the second cavity 121, and the first through hole 122 is provided on the protrusion 125. The number of the first through holes 122 can be 6 to 12, such as 8 or 10, and preferably they are evenly distributed along the circumference of the protrusion 125. Of course, the number and arrangement of the first through holes 122 can also be set according to actual needs.

[0058] The nozzle holder 120 is connected to the nozzle housing 110 via the protrusion 125. Specifically, a first internal thread may be provided at a position of the nozzle housing 110 corresponding to the protrusion 125. For example, in the illustrated embodiment, a first internal thread is provided on an inner surface of the first side wall 114 corresponding to the protrusion 125. A first external thread matching the first internal thread may be provided on an outer surface of the protrusion 125. The nozzle holder 120 may be connected to the nozzle housing 110 by meshing the first internal thread and the first external thread.

[0059] In order to ensure the stability of the threaded connection between the nozzle holder 120 and the nozzle housing 110, and to ensure that the installation position of the nozzle holder 120 in the first cavity 111 does not change, the nozzle housing 110 preferably further includes a first position limiting portion 116. In the illustrated embodiment, the first position limiting portion 116 is a position limiting boss formed on the inner surface of the first side wall 114, and the position limiting boss extends in the radial direction of the first cavity 111. Along the axial direction of the first cavity 111, the protrusion 125 can abut against the first position limiting portion 116 to ensure the stability of the installation of the nozzle holder 120.

[0060] The nozzle valve core 130 is at least partially disposed in the second cavity 121, and is preferably coaxially disposed with the nozzle holder 120. The nozzle valve core 130 may include a body portion 131 and a tapered portion 132. The body portion 131 is generally configured as a cylinder, and is at least partially disposed in the second cavity 121, and is movable along the axial direction of the second cavity 121. A clearance fit is adopted between the body portion 131 and the second side wall 123 to ensure that the body portion 131 can move freely in the second cavity 121 without being stuck.

[0061] In order to prevent the liquid to be atomized in the first cavity 111 from entering the second cavity 121 through the gap between the body portion 131 and the second side wall 123 of the nozzle holder 120, a first sealing member 151 is preferably provided. Specifically, the first sealing member 151 is provided between the body portion 131 and the nozzle holder 120 along the radial direction of the second cavity 121, and along the axial direction of the second cavity 121, the first sealing member 151 is adjacent to the side of the elastic member 140 close to the spray hole 113.

[0062] In order to facilitate the arrangement of the first seal 151, in the illustrated embodiment, a first groove 136 is provided at a position of the body portion 131 corresponding to the first seal 151, the first groove 136 extends along the circumferential direction of the body portion 131, and the first seal 151 is arranged in the first groove 136. It can be understood that in an embodiment not shown, the first groove 136 can also be provided at a position of the second side wall 123 corresponding to the first seal 151 to accommodate the first seal 151.

[0063] The tapered portion 132 is disposed at one end of the main body 131, specifically at one end of the main body 131 close to the spray hole 113. The tapered portion 132 can be integrally formed with the main body 131. The liquid to be atomized in the first cavity 111 can exert a certain pressure on the tapered portion 132 away from the spray hole 113 in the axial direction of the second cavity 121. As in the illustrated embodiment, the mechanical atomizing nozzle 100 is in a vertical use state, and the liquid to be atomized in the first cavity 111 can exert a certain upward pressure on the tapered portion 132. The tapered portion 132 is used to withstand and transmit the above-mentioned pressure of the liquid to be atomized, and under the combined action of the above-mentioned pressure and the elastic force of the elastic member 140 to be mentioned below, the main body 131 can move along the axial direction of the second cavity 121.

[0064] The radial dimension of the lower portion of the tapered portion 132 is smaller than the radial dimension of the spray hole 113. When the main body 131 moves along the axial direction of the second cavity 121, the lower portion of the tapered portion 132 can be driven to move in the spray hole 113, so that the size of the gap between the lower portion of the tapered portion 132 and the spray hole 113 can be changed along the radial direction of the second cavity 121, thereby adjusting the flow cross-sectional area of ​​the spray hole 113. The change in the flow cross-sectional area of ​​the spray hole 113 corresponds to the change in the flow rate of the liquid to be atomized in the first cavity 111, that is, the flow cross-sectional area of ​​the spray hole 113 is automatically adjusted as the flow rate of the liquid to be atomized in the first cavity 111 changes, that is, the flow cross-sectional area of ​​the spray hole 113 is automatically adjusted as the liquid inlet pressure of the liquid to be atomized changes, and then the amount of atomized liquid sprayed from the spray hole 113 is automatically adjusted according to the flow rate of the liquid to be atomized, which can reduce the change in the pressure difference on both sides of the spray hole 113 with the change in the flow rate of the liquid to be atomized, and at the same time ensure the atomization effect. The mechanical atomizing nozzle 100 has a larger adjustment range, which is beneficial to improving the adaptability of the mechanical atomizing nozzle 100 to changes in operating load.

[0065] The tapered portion 132 is preferably configured as a conical portion to simplify the structure of the tapered portion 132. The cone angle α of the tapered portion preferably satisfies: 50°≤α≤100°, so as to ensure that the contact area between the tapered portion 132 and the liquid to be atomized in the first cavity 111 is within a suitable range, so as to facilitate control of the pressure exerted on the tapered portion 132 by the liquid to be atomized in the first cavity 111, and thus facilitate control of the movement of the main body 131, that is, the nozzle valve core 130, along the axial direction of the second cavity 121 according to the flow rate of the liquid to be atomized, so as to reasonably change the flow cross-sectional area of ​​the spray hole 113.

[0066] The cone angle α of the cone is designed to satisfy 50°≤α≤100°, which can also make the lower part of the cone have a suitable curved surface shape, so as to reasonably change the flow cross-sectional area of ​​the nozzle hole 113 during the movement of the lower part of the cone in the nozzle hole 113.

[0067] Further preferably, the cone angle α satisfies: 60°≤α≤90°. For example, α can be designed to be 70°, 80°, etc., so as to further reasonably control the pressure of the liquid to be atomized in the first cavity 111 applied to the tapered portion 132, and ensure that the lower part of the conical portion has a suitable curved surface shape, so as to ultimately reasonably change the flow cross-sectional area of ​​the spray hole 113.

[0068] Similarly, in order to ensure that the contact area between the tapered portion 132 and the liquid to be atomized in the first cavity 111 is within an appropriate range and to facilitate control of the pressure exerted by the liquid to be atomized in the first cavity 111 on the tapered portion 132, the lower portion of the first cavity 111 is preferably constructed as a conical cavity.

[0069] In the illustrated embodiment, the bottom wall 115 of the nozzle housing 110 is configured as an inverted cone structure, so that the lower portion of the first cavity 111 forms a cone-shaped cavity. It is understood that in an embodiment not shown, only the inner surface of the bottom wall 115 may be configured as an inclined surface inclined from the spray hole 113 to the first side wall 114, so that the lower portion of the first cavity 111 forms a cone-shaped cavity. The outer surface of the bottom wall 115 may be configured in a form such as a plane.

[0070] The cone angle β of the conical cavity is preferably greater than the cone angle α of the conical portion. On the one hand, it is convenient to reasonably control the pressure exerted by the liquid to be atomized in the first cavity 111 on the tapered portion 132. On the other hand, when the tapered portion 132 moves to the position of closing the spray hole 113, that is, when the spray hole 113 is in a closed state, the tapered portion 132 of the nozzle valve core 130 and the bottom wall 115 of the nozzle housing 110 are only in line contact rather than surface contact. For details, refer to Figure 1 This prevents the mechanical atomizing nozzle 100 from being started again, where the tapered portion 132 is tightly fitted to the bottom wall 115, making it difficult for the liquid to be atomized to enter between the tapered portion 132 and the bottom wall 115, thereby causing the mechanical atomizing nozzle 100 to fail.

[0071] Furthermore, the difference δ between β and α preferably satisfies: 20°≤δ≤40°, such as designing δ to be 25°, 30°, 35°, etc., so as to further reasonably control the pressure exerted by the liquid to be atomized in the first cavity 111 on the tapered portion 132, and facilitate the restart of the mechanical atomizing nozzle 100.

[0072] The spray hole 113 may specifically be a Venturi hole, that is, the spray hole 113 is designed to include a tapered portion, a throat portion and a gradually expanding portion that are connected in sequence, so as to cooperate with the lower portion of the conical portion, reasonably change the flow cross-sectional area of ​​the spray hole 113, and be beneficial to improving the atomization effect.

[0073] In order to further improve the atomization effect, an atomizer 160 may be provided. The atomizer 160 is connected to the end of the tapered portion 132 and is located outside the spray hole 113. The atomized liquid sprayed from the spray hole 113 can be further broken up when flowing through the atomizer 160, thereby achieving a finer atomization effect.

[0074] The atomizer 160 is preferably connected to the tapered portion 132 in a detachable manner, such as by screwing, so that a suitable atomizer 160 can be selected and installed according to different application environments and desired atomization effects.

[0075] Please refer to Figure 3 , which shows the structure of the atomizer 160 of the first preferred embodiment of the present invention. The atomizer 160 may include a connecting rod 161, a connecting portion 162 and an atomizing tooth 163. The connecting portion 162 is connected to one end of the connecting rod 161. The connecting portion 162 may be configured in a disc shape. The atomizing tooth 163 may be configured in a rectangular parallelepiped shape, and is spaced apart on the side of the connecting portion 162 and vertically connected to the above-mentioned side. The atomized liquid sprayed from the spray hole 113 can be further broken up by the action of the atomizing tooth 163, thereby achieving a finer atomization effect.

[0076] The other end of the connecting rod 161 may be provided with a second external thread, and the end of the tapered portion 132 may be provided with a second internal thread matching the second external thread. The atomizer 160 may be detachably connected to the tapered portion 132 through the engagement of the second external thread and the second internal thread.

[0077] Please refer to Figure 4 , which shows the structure of the atomizer 260 of the second preferred embodiment of the present invention. The difference from the atomizer 160 of the first preferred embodiment is that the atomizer teeth 263 are connected to the side of the connecting portion 162 and are inclined relative to the side.

[0078] It is understood that the structural form of the atomizer is not limited to the above two. The atomizer can be specifically designed according to needs by changing the number, shape, size and installation angle of the atomizer teeth with respect to the side surface of the connecting portion 162.

[0079] Continue to refer Figure 1 and Figure 2, the elastic member 140 is arranged between the other end of the main body 131 and the nozzle holder 120 along the axial direction of the second cavity 121. As in the illustrated embodiment, the elastic member 140 is arranged between the top wall 124 of the nozzle holder 120 and the end of the main body 131 away from the tapered portion 132. The elastic member 140 is preferably arranged coaxially with the nozzle holder 120. The elastic member 140 can apply an elastic force toward the spray hole 113 to the main body 131 along the axial direction of the second cavity 121, so that when no liquid to be atomized flows into the first cavity 111, the main body 131 of the nozzle valve core 130 can move toward the spray hole 113 along the axial direction of the second cavity 121 under the action of the elastic force, so that the tapered portion 132 can close the spray hole 113, for specific reference. Figure 1 , so as to prevent the residual liquid to be atomized from leaking out of the spray hole 113 when the relevant device is parked or jumped.

[0080] The elastic member 140 may be configured as a spring to simplify the structure of the elastic member 140 and facilitate control of the elastic force applied by the elastic member 140 to the body portion 131 toward the spray hole 113 .

[0081] In order to position the elastic member 140 and ensure that the elastic member 140 does not deviate in the radial direction of the second cavity 121 during the process of expanding and contracting in the axial direction of the second cavity 121, the end of the body 131 away from the tapered portion 132 is preferably provided with a first limiting groove 133. The nozzle holder 120 preferably includes a second limiting groove 126 corresponding to the first limiting groove 133. In the illustrated embodiment, the second limiting groove 126 is provided on the inner surface of the top wall 124 of the nozzle holder 120. The elastic member 140 is at least partially located in the first limiting groove 133 and the second limiting groove 126.

[0082] Further, the nozzle valve core 130 preferably further includes a valve stem 134 and a fastener 135. The valve stem 134 is disposed at the other end of the body portion 131 and extends through the nozzle holder 120. The fastener 135 is disposed on the portion of the valve stem 134 extending beyond the nozzle holder 120. When the body portion 131 of the nozzle valve core 130 drives the tapered portion 132 to move to a position closing the spray hole 113 along the axial direction of the second cavity 121 of the nozzle holder 120, that is, when the spray hole 113 is in a closed state, the fastener 135 preferably abuts against the nozzle holder 120 to prevent the nozzle valve core 130 from slipping off the nozzle holder 120.

[0083] Specifically, the valve stem 134 is disposed at the end of the body portion 131 away from the tapered portion 132. The valve stem 134 is preferably disposed coaxially with the body portion 131. A second through hole for the valve stem 134 to pass through may be provided on the top wall 124 of the nozzle holder 120. The valve stem 134 passes through the elastic member 140 and the second through hole, and extends out of the nozzle holder 120.

[0084] An external thread may be provided on the portion of the valve stem 134 extending out of the nozzle holder 120, and the fastener 135 may be configured as a locking nut, which can cooperate with the external thread to be fixedly connected to the valve stem 134. The radial dimension of the fastener 135 such as a locking nut should be greater than the radial dimension of the second through hole.

[0085] In order to prevent the liquid to be atomized entering from the liquid inlet 112 from entering the second cavity 121 through the gap between the second through hole and the valve stem 134, a second sealing member 152 is preferably provided. Specifically, the second sealing member 152 is provided between the valve stem 134 and the nozzle holder 120 along the radial direction of the second cavity 121, and along the axial direction of the second cavity 121, the second sealing member 152 is adjacent to the side of the elastic member 140 away from the spray hole 113. That is to say, along the axial direction of the second cavity 121, the second sealing member 152 and the first sealing member 151 mentioned above are respectively located on both sides of the elastic member 140 to seal the nozzle valve core 130 and the nozzle holder 120, so as to prevent the liquid to be atomized from entering the second cavity 121.

[0086] In order to facilitate the arrangement of the second sealing member 152, in the illustrated embodiment, a second groove 127 is provided at a position of the top wall 124 of the nozzle holder 120 corresponding to the second sealing member 152, and the second sealing member 152 is arranged in the second groove 127. It can be understood that in an embodiment not shown, the second groove 127 can also be provided at a position of the valve stem 134 corresponding to the second sealing member 152, and extend along the circumferential direction of the valve stem 134 to accommodate the second sealing member 152.

[0087] In order to prevent the portion of the valve stem 134 extending beyond the nozzle rack 120 and the fastener 135 from being immersed in the liquid to be atomized for a long time, a protective cover 180 is preferably provided at a position of the nozzle rack 120 close to the valve stem 134, and the portion of the valve stem 134 extending beyond the nozzle rack 120 and the fastener 135 are both located in the protective cover 180.

[0088] exist Figure 1 and Figure 2 In the illustrated embodiment, the longitudinal section of the protective cover 180 is configured to be U-shaped so as to form a space for accommodating the portion of the valve stem 134 extending beyond the nozzle holder 120 and the fastener 135. The protective cover 180 is connected to the top wall 124 of the nozzle holder 120. Specifically, a third external thread may be provided at the top wall 124 of the nozzle holder 120, and a third internal thread matching the third external thread may be provided at a position of the protective cover 180 connected to the top wall 124. The protective cover 180 may be connected to the top wall 124 of the nozzle holder 120 through the engagement of the third internal thread and the third external thread.

[0089] In order to ensure the stability of the threaded connection between the protective cover 180 and the top wall 124 , a step portion is preferably provided at the top wall 124 , and the third external thread is provided at the step portion so that the protective cover 180 can abut against the step portion when being threaded to the top wall 124 .

[0090] In addition, in order to prevent impurities that may exist in the liquid to be atomized from clogging the spray hole 113 , a filter 170 is preferably provided at the liquid inlet 112 , and the filter 170 is connected to the nozzle housing 110 .

[0091] Specifically, a fourth internal thread may be provided at a position of the nozzle housing 110 corresponding to the filter element 170, such as at Figure 1 and Figure 2 In the illustrated embodiment, the inner surface of the first side wall 114 corresponding to the filter element 170 is provided with a fourth internal thread. The outer surface of the filter element 170 may be provided with a fourth external thread that matches the fourth internal thread, and the filter element 170 may be connected to the nozzle housing 110 through the engagement of the fourth internal thread and the fourth external thread.

[0092] In the illustrated embodiment, the longitudinal section of the filter element 170 is configured to be U-shaped so as to form a space for accommodating the protective cover 180 and avoid interference with the protective cover 180 during installation.

[0093] In order to ensure the stability of the threaded connection between the filter element 170 and the nozzle housing 110 and to ensure that the installation position of the filter element 170 does not change, the filter element 170 preferably further includes a second limiting portion 171. In the illustrated embodiment, the second limiting portion 171 is a limiting boss formed on the outer surface of the filter element 170, and the limiting boss extends in the radial direction of the filter element 170. Along the axial direction of the nozzle housing 110, the second limiting portion 171 can abut against the nozzle housing 110 to ensure the stability of the installation of the filter element 170.

[0094] During actual use of the mechanical atomizing nozzle 100 with self-adjustable cross-sectional area of ​​the spray hole 113 according to the present invention, when the liquid to be atomized flows in through the liquid inlet 112, the liquid to be atomized enters the first cavity 111 of the nozzle housing 110 close to the spray hole 113 through the first through hole 122 of the nozzle holder 120, and applies a certain pressure along the axial direction of the second cavity 121 away from the spray hole 113 to the tapered portion 132 of the nozzle valve core 130. When the pressure is greater than the elastic force applied by the elastic member 140 to the main body 131 along the axial direction of the second cavity 121 toward the spray hole 113, the nozzle valve core 130 moves along the axial direction of the second cavity 121 toward a direction away from the spray hole 113, and compresses the elastic member 140 until the above pressure is balanced with the above elastic force. During this process, the lower portion of the tapered portion 132 moves in the spray hole 113 along the axial direction of the second cavity 121 toward a direction away from the spray hole 113, so as to move the spray hole 113 from the closed state (refer to Figure 1 ) to the open state (reference Figure 2 ), so that the liquid to be atomized is sprayed out from the gap between the lower part of the tapered portion 132 and the spray hole 113, and is further dispersed into fine atomized droplets by the atomizing element 160.

[0095] When the flow rate of the liquid to be atomized increases, the pressure generated by the liquid to be atomized on the tapered portion 132 increases accordingly, the nozzle valve core 130 continues to move in the direction away from the spray hole 113, and the elastic member 140 continues to be compressed until the above pressure and the elastic force of the elastic member 140 reach a balance again, the radial gap between the lower part of the tapered portion 132 and the spray hole 113 increases, the flow cross-sectional area of ​​the spray hole 113 increases, and the amount of sprayed atomized liquid increases accordingly.

[0096] When the flow rate of the liquid to be atomized decreases, the pressure generated by the liquid to be atomized on the tapered portion 132 decreases accordingly, and the elastic member 140 stretches until the above pressure and the elastic force of the elastic member 140 reach a balance again, and the radial gap between the lower part of the tapered portion 132 and the spray hole 113 decreases, the flow cross-sectional area of ​​the spray hole 113 decreases, and the amount of sprayed atomized liquid decreases accordingly.

[0097] When the corresponding device stops or jumps and no atomized liquid flows in, the pressure acting on the tapered portion 132 gradually decreases to zero, and the elastic member 140 naturally stretches, so that the nozzle valve core 130 moves to the tapered portion 132 abuts against the bottom wall 115 of the nozzle housing 110, so as to open the spray hole 113 from the open state (refer to Figure 2 ) to the closed state (reference Figure 1 ), and avoids the residual liquid to be atomized from leaking out of the spray hole 113.

[0098] According to the mechanical atomizing nozzle 100 with self-adjustable cross-sectional area of ​​the spray hole 113 of the present invention, the flow cross-sectional area of ​​the spray hole 113 is directly proportional to the flow rate of the liquid to be atomized. Therefore, in the process of adjusting the flow rate of the liquid to be atomized, the pressure difference before and after the spray hole 113 can be reduced as the flow rate of the liquid to be atomized changes, thereby achieving a larger adjustment range even at a lower liquid inlet pressure and strong adaptability to changes in operating load.

[0099] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "parts" and "pieces" appearing in this article may represent either a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing in this article may represent either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0100] The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area, characterized in that: include: A nozzle housing, the nozzle housing comprising a first cavity and a liquid inlet and a spray hole both connected to the first cavity, the first cavity being used to contain liquid to be atomized; a nozzle holder, the nozzle holder being arranged in the first cavity and comprising a second cavity and a first through hole, the first through hole being arranged outside the second cavity and communicating with the first cavity; A nozzle valve core, the nozzle valve core comprising a main body and a tapered portion arranged at one end of the main body, the other end of the main body being provided with a first limiting groove, the main body being at least partially arranged in the second cavity and being able to move along the axial direction of the second cavity, the radial dimension of the lower portion of the tapered portion being smaller than the radial dimension of the spray hole, the tapered portion being used to bear and transmit the pressure of the liquid to be atomized, so that the main body can move along the axial direction, so as to drive the lower portion of the tapered portion to move in the spray hole, thereby adjusting the flow cross-sectional area of ​​the spray hole; as well as an elastic member, the elastic member being arranged between the other end of the body portion and the nozzle holder along the axial direction, and being used for applying an elastic force toward the spray hole to the body portion along the axial direction; in The tapered portion is configured as a conical portion, and a conical angle α of the conical portion satisfies: 50°≤α≤100°; The lower portion of the first cavity is configured as a conical cavity, a conical angle β of the conical cavity is greater than a conical angle α of the conical portion, and a difference δ between β and α satisfies: 20°≤δ≤40°.

2. The mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area according to claim 1, characterized in that: The spray hole is a Venturi hole.

3. The mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area according to claim 1, characterized in that: The nozzle holder comprises a second limiting groove corresponding to the first limiting groove, and the elastic member is at least partially located in the first limiting groove and the second limiting groove.

4. The mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area according to any one of claims 1 to 3, characterized in that: The nozzle valve core further comprises a valve stem and a fastener, wherein the valve stem is arranged at the other end of the body portion and extends through the nozzle frame, and the fastener is arranged on a portion of the valve stem extending beyond the nozzle frame.

5. The mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area according to claim 4, characterized in that: Also includes a first sealing member, the first sealing member is disposed between the body portion and the nozzle holder along the radial direction of the second cavity, and along the axial direction, the first sealing member is adjacent to a side of the elastic member close to the spray hole; and / or, The invention also includes a second sealing member, which is arranged between the valve stem and the nozzle holder along the radial direction of the second cavity, and is adjacent to a side of the elastic member away from the spray hole along the axial direction.

6. The mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area according to any one of claims 1 to 3, characterized in that: The invention also comprises an atomizing element, which is connected to the end of the tapered portion and is located outside the spray hole.

7. The mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area according to any one of claims 1 to 3, characterized in that: It also includes a filter element, which is connected to the nozzle housing and is arranged at the liquid inlet.

8. The mechanical atomizing nozzle with self-adjustable spray hole cross-sectional area according to claim 4, characterized in that: The invention also comprises a protective cover, which is arranged at a position of the nozzle holder close to the valve stem, and a portion of the valve stem extending beyond the nozzle holder is located in the protective cover.

Images