Controllable piezoelectric ultrasonic sprayer

Abstract

The utility model discloses a controllable piezoelectric ultrasonic sprayer which comprises a shell, and a luffing mechanism, a gas flow guide mechanism and a liquid supply mechanism are arranged in the shell. A pair of first through holes are formed in the top of the shell, and a first flow guide gas pipe joint is arranged in one of the first through holes; by arranging the heat dissipation holes and the heat dissipation seams, on one hand, an air curtain cover is formed when high-pressure air is introduced from the first flow guide air pipe connector, the spraying shape can be effectively guaranteed, and paint splashing is avoided; and on the other hand, due to the existence of the heat dissipation holes and the heat dissipation seams, when the piezoelectric transduction sheet continuously works to generate heat, the heat is timely conveyed to the outside of the controllable piezoelectric ultrasonic spray head, so that the piezoelectric core element is ensured to work in a proper temperature interval; the situation that the controllable piezoelectric ultrasonic spray head has to stop working due to untimely heat dissipation is avoided, and the technical problems that in the prior art, a spray head is low in spraying efficiency and untimely in heat dissipation, and spraying points are scattered are solved.

Description

Technical Field

[0001] The utility model belongs to the field of automatic spraying and relates to a spray head, in particular to a controllable piezoelectric ultrasonic spray head. Background Art

[0002] Ultrasonic spraying is a highly efficient spraying technology and a spraying method based on ultrasonic atomization spraying technology. Compared with traditional pneumatic two-fluid spraying, ultrasonic atomization spraying can achieve better uniformity, thinner coating thickness, and higher precision. At the same time, since ultrasonic nozzles do not require air pressure assistance to atomize, the use of ultrasonic spraying can significantly reduce paint splashing during the spraying process, achieving the purpose of saving paint. The paint utilization rate of ultrasonic spraying is more than 4 times that of traditional two-fluid spraying. Ultrasonic nozzles use the energy of ultrasound to break up water or liquids, forming tiny particles ranging from a few microns to more than 100 microns in size, to achieve the purposes of air humidification, liquid granulation, mixing, promoting chemical reactions, spraying, and metal melt powdering.

[0003] The shell of the ultrasonic nozzle in the existing technology is a sealed shell, which results in the nozzle being unable to dissipate heat in time when working at high frequency. It needs to stop working to dissipate heat and then restart working, resulting in low spraying efficiency. In addition, the existing ultrasonic nozzle also has the problem of scattered spray points. Utility Model Content

[0004] The purpose of the utility model is to provide a controllable piezoelectric ultrasonic nozzle to solve the technical problems of low spraying efficiency, untimely heat dissipation of the nozzle and scattered spraying points in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A controllable piezoelectric ultrasonic nozzle comprises a housing, wherein an amplitude changing mechanism, a gas guiding mechanism and a liquid supply mechanism are provided in the housing;

[0007] The top of the housing is provided with a pair of first through holes, one of which is provided with a first air guide pipe joint, and the first air guide pipe joint is provided with a second air guide hole; the bottom of the housing is provided with a pair of heat dissipation holes;

[0008] The amplitude variation mechanism includes an amplitude variation rod extending from the housing at the bottom, a first cavity, a second cavity, and a guide air slit being connected to each other in the middle of the amplitude variation rod, the diameter of the first cavity being smaller than that of the second cavity, an axial core being disposed in the first cavity, a plurality of piezoelectric transducers disposed in parallel being sleeved in the axial middle of the axial core, and a conductive sheet being disposed between adjacent piezoelectric transducers; a drive signal line being connected to the piezoelectric transducer, an end of the drive signal line extending from another first through hole and connected to an external drive box; a heat dissipation slit being disposed on the surface of the housing in contact with the amplitude variation rod;

[0009] The gas diversion mechanism includes a diversion air path valve core with its bottom inserted into the top of the shaft core, a stepped cavity with a gradually smaller diameter is provided on the top of the diversion air path valve core, a second diversion air pipe joint is provided in the stepped cavity, a third diversion air hole is provided on the second diversion air pipe joint, and the third diversion air hole is connected to the stepped cavity, the center of the shaft core, the second cavity and the diversion air gap in sequence;

[0010] The liquid supply mechanism includes a liquid supply pipe joint arranged at the bottom of the shell, one end of the liquid supply pipe joint is connected to a liquid guide tube, there is a gap between the end of the liquid guide tube and the concave surface of the amplitude transformer, and the other end of the liquid supply pipe joint is connected to an external liquid supply system.

[0011] The utility model also includes the following technical features:

[0012] The housing includes an upper housing and a lower housing.

[0013] A pair of mounting brackets are provided at the bottom of the lower shell, and the liquid supply pipe joints are fixedly mounted on the mounting brackets.

[0014] The liquid supply pipe joint is fixed on the mounting bracket by means of a jackscrew.

[0015] A sealing ring is provided between the upper shell and the lower shell.

[0016] A back-tightening nut is provided on the outer side of the contact point between the guide air path valve core and the shaft core.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] (I) In the present invention, by providing heat dissipation holes and heat dissipation seams, on the one hand, an air curtain is formed when high-pressure gas is introduced from the first air guide pipe joint, which can effectively ensure the spraying shape and avoid paint splashing; on the other hand, due to the existence of the heat dissipation holes and the heat dissipation seams, the piezoelectric transducer generates heat during continuous operation and transfers the heat to the outside of the controllable piezoelectric ultrasonic nozzle in a timely manner, ensuring that the piezoelectric core component operates in a suitable temperature range, avoiding the situation where the controllable piezoelectric ultrasonic nozzle has to suspend its work due to untimely heat dissipation, and solving the technical problems of low nozzle spraying efficiency, untimely nozzle heat dissipation and scattered spraying points in the prior art.

[0019] (II) The present invention can realize controllable spraying frequency by controlling the driving frequency of the piezoelectric transducer. By adopting the on-demand feeding method, the spraying frequency can be automatically adjusted according to the movement speed of the spraying equipment and the requirements of the spraying workpiece, thereby effectively controlling the uniformity of the spraying film thickness and further improving the consistency of the spraying film thickness surface.

[0020] (III) In the present invention, since the aperture of the guide air slit is very small, the air flow rate and gas flow rate out of the guide air slit are greatly reduced, so that the spraying distance is less than 20 mm, avoiding a large amount of paint loss due to excessive spraying distance. This device is expected to control the loss within 5%, effectively avoiding environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a partial three-dimensional enlarged view of the present invention.

[0023] The meanings of the various reference numerals in the figure are: housing 1, amplitude-changing mechanism 2, gas flow guiding mechanism 3, liquid supply mechanism 4, first through hole 5, first flow guiding air pipe joint 6, heat dissipation hole 7, heat dissipation slit 8, back-tightening nut 9, second flow guiding air hole 10;

[0024] Upper shell 101, lower shell 102, mounting bracket 103, top screw 104, sealing ring 105;

[0025] Amplitude transformer 201, first cavity 202, second cavity 203, air guide slit 204, shaft core 205, piezoelectric transducer 206, conductive sheet 207, driving signal line 209;

[0026] The guide air path valve core 301, the stepped cavity 302, the second guide air pipe joint 303, and the third guide air hole 304;

[0027] Liquid supply pipe connector 401, liquid guide tube 402.

[0028] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0029] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0030] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the scope of protection of the present invention.

[0031] The utility model provides a controllable piezoelectric ultrasonic nozzle, such as Figures 1 to 2 As shown, it includes a shell 1, in which an amplitude changing mechanism 2, a gas flow guiding mechanism 3 and a liquid supply mechanism 4 are provided;

[0032] The top of the housing 1 is provided with a pair of first through holes 5, wherein a first air guide pipe joint 6 is provided in one of the first through holes 5, and a second air guide hole 10 is provided on the first air guide pipe joint 6; the bottom of the housing 1 is provided with a pair of heat dissipation holes 7;

[0033] The amplitude variation mechanism 2 includes an amplitude variation rod 201 extending from the bottom of the housing 1. A first cavity 202, a second cavity 203, and a guide air slit 204 are formed in the middle of the amplitude variation rod 201. The diameter of the first cavity 202 is smaller than that of the second cavity 203. An axial core 205 is provided in the first cavity 202. A plurality of piezoelectric transducers 206 arranged in parallel are sleeved in the axial middle of the axial core 205. A conductive sheet 207 is provided between adjacent piezoelectric transducers 206. A drive signal line 209 is connected to the piezoelectric transducer 206. The end of the drive signal line 209 extends from another first through hole 5 and is connected to the external drive box. A heat dissipation slit 8 is provided on the surface of the housing 1 in contact with the amplitude variation rod 201.

[0034] The gas diversion mechanism 3 includes a diversion gas path valve core 301 whose bottom is inserted into the top of the shaft core 205. The top of the diversion gas path valve core 301 defines a stepped cavity 302 of gradually decreasing diameter. A second diversion gas pipe joint 303 is disposed in the stepped cavity 302. A third diversion gas hole 304 is defined in the second diversion gas pipe joint 303. The third diversion gas hole 304 is sequentially connected to the stepped cavity 302, the center of the shaft core 205, the second cavity 203, and the diversion gas gap 204.

[0035] The liquid supply mechanism 4 includes a liquid supply pipe joint 401 arranged at the bottom of the shell 1. One end of the liquid supply pipe joint 401 is connected to a liquid guide tube 402. There is a gap between the end of the liquid guide tube 402 and the concave surface 208 opened on the amplitude transformer 201. The other end of the liquid supply pipe joint 401 is connected to the external liquid supply system.

[0036] The working process of the ultrasonic nozzle is as follows:

[0037] The second guide air pipe joint 303 is connected to the external guide air circuit, and the pressure is set to 0.15Mpa, which is used to blow the scattered liquid onto the surface of the workpiece; the first guide air pipe joint 6 is connected to the air circuit, and the pressure is set to 0.08Mpa, which is used to dissipate heat and prevent the liquid from scattering; the drive signal line 209 is connected to the external drive box to connect the drive line. When the drive signal is triggered, the drive signal is applied to the piezoelectric transducer 206, and the piezoelectric transducer 206 drives the shaft core 205 to vibrate, thereby driving the amplitude rod 201 to vibrate, thereby driving the piezoelectric ultrasonic nozzle to work. At the same time, this trigger signal will also be given to the external liquid supply system, and the external liquid supply system will supply liquid to the nozzle as needed;

[0038] When the liquid flows out of the guide port from the liquid guide tube 402, the liquid surface just contacts the concave surface 208 of the amplitude transformer 201. At this time, under the action of gravity, the liquid falls along the concave surface 208 to the bottom surface of the amplitude transformer 201. Then, the high-frequency vibration amplified by the amplitude transformer 201 will break up the liquid at the bottom of the amplitude transformer 201 into atomized particles, and further, under the action of the guiding airflow ejected from the guide air slit 204, the atomized liquid particles are evenly blown onto the surface of the workpiece.

[0039] Preferably, the driving frequency is 102Khz, the driving voltage is 120V, and each time a driving waveform signal is sent, the ultrasonic nozzle works once, that is, the liquid is atomized once, and is evenly sprayed on the workpiece surface once under the action of the guiding airflow ejected from the guiding air slit 204.

[0040] Gas is supplied through the first air guide pipe joint 6, enters the housing 1 through the first air guide pipe joint 6, outputs the first air curtain through the heat dissipation hole 7, and then outputs the second air curtain through the heat dissipation slit 8, thereby taking out the heat generated by the ultrasonic nozzle when working at high frequency. At the same time, the two air curtains can also block the scattered liquid particles sprayed out of the nozzle, thereby preventing paint from splashing.

[0041] In the above technical solution, by setting the heat dissipation holes 7 and the heat dissipation seams 8, on the one hand, an air curtain is formed when high-pressure gas is introduced from the first air guide pipe joint 6, which can effectively ensure the spraying shape and avoid paint splashing; on the other hand, due to the existence of the heat dissipation holes 7 and the heat dissipation seams 8, the piezoelectric transducer 206 generates heat during continuous work and transfers the heat to the outside of the controllable piezoelectric ultrasonic nozzle in time, ensuring that the piezoelectric core component operates in a suitable temperature range, avoiding the situation where the controllable piezoelectric ultrasonic nozzle has to suspend work due to untimely heat dissipation, and solving the technical problems of low nozzle spraying efficiency, untimely nozzle heat dissipation and scattered spray points in the prior art.

[0042] By controlling the driving frequency of the piezoelectric transducer 206, the frequency of spraying can be controlled. By adopting the on-demand feeding method, the spraying frequency can be automatically adjusted according to the movement speed of the spraying equipment and the needs of the spraying workpiece, thereby effectively controlling the uniformity of the spray film thickness, thereby improving the consistency of the spray film thickness surface.

[0043] Since the aperture of the guide air slit 204 is very small, the air flow rate and gas flow out of the guide air slit are greatly reduced, so that the spraying distance is less than 20mm, avoiding a large amount of paint loss due to excessive spraying distance. This device is expected to control the loss within 5%, effectively avoiding environmental pollution.

[0044] The housing 1 includes an upper housing 101 and a lower housing 102 , which facilitates installation and removal of components within the housing 1 .

[0045] A pair of mounting brackets 103 are provided at the bottom of the lower housing 102 , and a liquid supply pipe connector 401 is fixedly mounted on the mounting brackets 103 .

[0046] The liquid supply pipe joint 401 is fixed to the mounting bracket 103 via a top screw 104 .

[0047] A sealing ring 105 is provided between the upper shell 101 and the lower shell 102 .

[0048] In the above technical solution, the provision of the sealing ring 105 can effectively ensure the pressure inside the shell.

[0049] A tightening nut 9 is provided on the outer side of the contact portion between the guide air path valve core 301 and the shaft core 205 , for fixing the guide air path valve core 301 and the shaft core 205 .

Claims

1. A controllable piezoelectric ultrasonic nozzle, characterized in that: It comprises a housing (1), wherein an amplitude changing mechanism (2), a gas flow guiding mechanism (3) and a liquid supply mechanism (4) are provided in the housing (1); A pair of first through holes (5) are provided on the top of the housing (1), a first air guide pipe joint (6) is provided in one of the first through holes (5), and a second air guide hole (10) is provided on the first air guide pipe joint (6); a pair of heat dissipation holes (7) are provided on the bottom of the housing (1); The amplitude-changing mechanism (2) comprises an amplitude-changing rod (201) whose bottom extends out of the housing (1); a first cavity (202), a second cavity (203) and a flow-guiding air gap (204) are provided in the middle of the amplitude-changing rod (201); the diameter of the first cavity (202) is smaller than that of the second cavity (203); an axis core (205) is provided in the first cavity (202); a plurality of piezoelectric transducers (206) arranged in parallel are sleeved in the axial middle of the axis core (205); a conductive sheet (207) is provided between adjacent piezoelectric transducers (206); a driving signal line (209) is connected to the piezoelectric transducer (206); an end of the driving signal line (209) extends from another first through hole (5) and is connected to an external driving box; a heat dissipation gap (8) is provided on the surface of the housing (1) in contact with the amplitude-changing rod (201); The gas flow guiding mechanism (3) comprises a flow guiding air path valve core (301) whose bottom is inserted into the top of the shaft core (205); a stepped cavity (302) with a gradually smaller diameter is provided on the top of the flow guiding air path valve core (301); a second flow guiding air pipe joint (303) is provided in the stepped cavity (302); a third flow guiding air hole (304) is provided on the second flow guiding air pipe joint (303); the third flow guiding air hole (304) is connected to the stepped cavity (302), the center of the shaft core (205), the second cavity (203) and the flow guiding air gap (204) in sequence; The liquid supply mechanism (4) comprises a liquid supply pipe joint (401) arranged at the bottom of the housing (1); one end of the liquid supply pipe joint (401) is connected to a liquid guide tube (402); a gap exists between the end of the liquid guide tube (402) and a concave surface (208) provided on the amplitude rod (201); and the other end of the liquid supply pipe joint (401) is connected to an external liquid supply system.

2. The controllable piezoelectric ultrasonic nozzle according to claim 1, characterized in that: The housing comprises an upper housing (101) and a lower housing (102).

3. The controllable piezoelectric ultrasonic nozzle according to claim 2, characterized in that: A pair of mounting frames (103) are provided at the bottom of the lower shell (102), and the liquid supply pipe joint (401) is fixedly mounted on the mounting frames (103).

4. The controllable piezoelectric ultrasonic nozzle according to claim 3, characterized in that: The liquid supply pipe joint (401) is fixed to the mounting frame (103) via a top screw (104).

5. The controllable piezoelectric ultrasonic nozzle according to claim 2, characterized in that: A sealing ring (105) is provided between the upper shell (101) and the lower shell (102).

6. The controllable piezoelectric ultrasonic nozzle according to claim 1, characterized in that: A back-tightening nut (9) is provided on the outer side of the contact point between the guide air path valve core (301) and the shaft core (205).

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