TWM678104U - Nozzle structure of fluid material spray cartridge - Google Patents

Abstract

This invention provides a nozzle structure for a fluid material spray cartridge. The fluid material spray cartridge is used to spray an appropriate amount of fluid material onto a substrate. The nozzle is disposed at the bottom end of the fluid material spray cartridge, corresponding to the substrate. It includes a main body, a screw connection, and a positioning shoulder. The main body has a flow channel inside, a flow guide portion at the bottom end, and a spray nozzle. The flow channel transports the fluid material, which is ejected from the spray nozzle through the flow guide portion. The screw connection portion is provided with… At the top of the main body, a mounting cavity is provided at the bottom of a valve body of a fluid material spray cartridge, allowing the main body to be detachably screwed in. A positioning shoulder is located on the outside of the main body and corresponds to a stepped portion on the inside of the mounting cavity, limiting the depth to which the main body is locked into the mounting cavity. Herein, a striker inside the valve body can move vertically into the flow channel and correspond to the flow guide portion, controlling the opening and closing of the spray nozzle. The fluid material is precisely sprayed from the spray nozzle onto the substrate via the control of the striker.

Description

Nozzle structure of a fluid material spray cartridge

This invention relates to a fluid material spraying apparatus used in semiconductor manufacturing processes, precision coating, or biomedical material dispensing; more specifically, it refers to one such apparatus.

Note that in conventional fluid dispensing technology, the most common method is time-pressure controlled feeding, which uses back pressure to continuously push the fluid to the nozzle. However, this method is highly susceptible to changes in fluid viscosity, ambient temperature, and unstable storage pressure, resulting in uneven dispensing and failing to meet the demands of semiconductor manufacturing processes for micro-dosage and high-precision coating.

In recent years, the industry has gradually developed a non-contact dispensing technology called "jetting dispenser." This technology utilizes a high-speed reciprocating plunger or ball within a valve to instantly generate pressure pulses, propelling the fluid material from the nozzle as droplets that fly through the air and land on the substrate. This technology eliminates the need for Z-axis lifting or leveling, making it particularly suitable for applications with warped substrates, densely packed components, or deep and narrow areas. Representative products include the Nordson ASYMTEK DJ series and the EFD PICO series. It can be applied to various epoxy resins, underfill materials, conductive adhesives, UV adhesives, silicones, and thermal interface materials.

Conventional spray applicators typically include: a fluid supply module (storage tank, piping, and pressure control system), a spray valve core module (actuator, striker, valve seat, and nozzle), a heating and control module (heater and temperature feedback control), a control electronics module (waveform controller and human-machine interface), a motion and positioning module (XYZ platform and vision alignment system), and auxiliary modules (filters, cleaning and environmental control devices), etc. A preferred example is shown in Republic of China Patent No. I741985. Although the technology disclosed in this patent can achieve high-speed micro-dispensing, it still has some shortcomings in practical use. For example, the nozzle (guide section and spray port) and nozzle housing are a two-piece assembly, requiring a nozzle retainer to join and seal them. However, nozzle retainers are mostly made of epoxy resin, which is prone to deterioration or damage under prolonged high temperatures. Furthermore, during high-speed operation of the ejector pin, the impact force transmitted to the retainer can easily cause fatigue damage, thus affecting sealing and spray stability. Incorrect nozzle positioning can also affect the operation of the ejector pin and the precise control of the fluid spray volume. Therefore, existing nozzle structures cannot fully meet the requirements for high precision and high reliability.

Therefore, existing technologies cannot completely solve the above problems, and their shortcomings highlight the necessity for improvement in this invention.

The primary objective of this invention is to provide a nozzle structure for a fluid material spray cartridge. Its simple structure and convenient assembly allow for precise positioning within the valve body's mounting cavity, ensuring nozzle stability and reliability. This enhances spray accuracy and consistency, preventing issues such as leakage, dead volume, and uneven droplet distribution. It also offers high application flexibility and long-term durability, making it a truly practical product.

Therefore, to achieve the aforementioned objective, this invention provides a nozzle structure for a fluid material spraying cartridge. The fluid material spraying cartridge is used to spray an appropriate amount of fluid material onto a substrate. The nozzle is disposed at the bottom of the fluid material spraying cartridge, corresponding to the substrate. It comprises a body, shaped as an upward-opening cylinder, with an internal flow channel, a flow guide portion at the bottom, and a spray port. The guide channel is used to transport fluid material, which is ejected from the nozzle through the guide section. A screw connection is provided at the top end of the main body, allowing the main body to be detachably screwed into an installation cavity at the bottom end of a valve body of the fluid material injection cartridge. A positioning shoulder is provided on the outer side of the main body, corresponding to a stepped portion on the inner side of the installation cavity, to limit the depth to which the main body is locked into the installation cavity.

Preferably, the spray nozzle comprises a large-diameter section and a small-diameter section, the large-diameter section connecting to the guide section and the small-diameter section connecting the large-diameter section to the outside.

Preferably, the length of the major diameter segment is greater than that of the minor diameter segment.

Preferably, the bottom end of the main body, corresponding to the position of the small-diameter segment, is provided with a protruding opening, and the small-diameter segment passes through the protruding opening.

Preferably, the guide portion is recessed into the inner wall of the bottom end of the main body, and is in the shape of an inverted cone with a gradually decreasing cross-sectional area, so as to guide the fluid material to gradually converge to the injection port.

Preferably, the positioning shoulder is located at one end of the screw connection and abuts against the stepped portion.

10: Spraying lips

1: Valve body

2: Firing pin

3: Upper valve body

4: Lower valve body

5: Installation cavity

6: Step difference part

12: The Body

14:Screw joint

16: Positioning Shoulder

21: Protruding mouth

22: Flow channel

24: Airflow Guide Section

26: Spray nozzle

28: Major Track

30: Short Track

The first figure is a schematic diagram showing the combined appearance of some components of the learned fluid material spraying cartridge and this invention.

The second figure is a sectional view of the first figure.

Figure 3 is a sectional view of a preferred embodiment of this invention.

Below, we provide a preferred embodiment of this work, along with further detailed explanations and illustrations:

Please refer to Figures 1 to 3, which illustrate a preferred embodiment of the nozzle 10 structure of a fluid material jetting cartridge. This fluid material jetting cartridge is used to jet an appropriate amount of fluid material onto a substrate (not shown in the figures). The nozzle 10 is disposed at the bottom of the fluid material jetting cartridge, corresponding to the substrate. This fluid material jetting cartridge is a conventional jetting applicator. The dispensing device (or sprayer) is a non-contact dispensing device used in the conventional semiconductor packaging and electronic dispensing fields to spray fluid materials onto a substrate. It generally includes a fluid supply unit connected to a fluid material spray cartridge and a heating and control module (not shown in the figure). The detailed mechanism of the sprayer is not described in detail here. The fluid material can be various heat-sensitive fluid materials, such as epoxy resin, polysiloxane, or adhesives with temperature-dependent viscosity. The fluid material spray cartridge generally consists of a valve body 1, a nozzle 10, a firing pin 2 and an actuator, and a heating element (not shown in the figure). The valve body 1 is composed of an upper valve body 3 and a lower valve body 4 facing each other. The upper valve body 3 is connected to the fluid supply unit. The nozzle 10 is located at the bottom of the lower valve body 4. The striker 2 is reciprocally disposed inside the valve body 1 and extends into the nozzle 10. The actuator is controlled by the heating and control module to actuate the striker 2 to "spray" or "eject" the fluid material from the nozzle 10 onto the substrate. The heating element is disposed on one side of the valve body 1 and is controlled by the heating and control module to heat the fluid material spray box and the fluid material to maintain the flow of the fluid material and the target temperature and viscosity when it enters the nozzle 10. The valve body 1, the striking pin 2, the actuator, and the heating element are components of a conventional fluid material ejector cartridge; their detailed structures are not described in detail here. The nozzle 10 includes a body 12, a threaded connection 14, and a positioning shoulder 16.

The main body 12 is a cylindrical shape with its opening facing upwards. It has a protruding nozzle 21 at its bottom end, and internally includes a flow channel 22, a flow guide 24, and a spray nozzle 26. The flow channel 22 is used to transport fluid materials and to allow the impact pin 2 to extend into it. The flow guide 24 is recessed into the inner wall of the bottom end of the main body 12 and connects to the flow channel 22, with its cross-sectional area gradually decreasing from large to small. The nozzle is cone-shaped, used to guide the fluid material to gradually converge to the nozzle 26. The nozzle 26 passes through the guide section 24 and the nozzle 21 to connect to the outside. It includes a large-diameter section 28 and a small-diameter section 30. The large-diameter section 28 is connected to the guide section 24, and the small-diameter section 30 is connected to the large-diameter section 28 and passes through the nozzle 21 to connect to the outside. The large-diameter section 28 (with an inner diameter of approximately...) The length of the segment (approximately 0.27 mm, but not limited to) is greater than the minor diameter segment by 30 mm (length approximately 0.3 mm, inner diameter approximately...). (0.05, but not limited), the fluid material is ejected from the small diameter section 30 through the guide section 24.

The threaded portion 14, with external threads, is located on the outer top end of the body 12, allowing the body 12 to be detachably threaded into a mounting cavity 5 at the bottom end of the lower valve body 4.

The positioning shoulder 16, encircling the outer side of the body 12 and located at one end of the screw connection 14, allows the body 12 to be engaged with and fitted against a stepped portion 6 provided inside the mounting cavity 5 (an O-ring is provided between the two to prevent leakage) after it is locked into the mounting cavity 5, thereby limiting the depth to which the body 12 is locked into the mounting cavity 5.

Therefore, the nozzle 10 of this invention, in conjunction with the lower valve body 4 and the ejector pin 2, forms a precisely controllable fluid ejection mechanism. Through the reciprocating opening and closing of the ejection port 26 by the ejector pin 2, the fluid material can be ejected onto the substrate under pressure pulses under high-precision conditions. This is suitable for applications such as colloid dispensing and micro-volume encapsulation material coating in semiconductor manufacturing processes. The cooperation between the positioning shoulder 16 and the stepped portion 6 within the mounting cavity 5 ensures that the nozzle 10 has an automatic alignment and stable positioning effect during assembly, further improving the stability and reliability of the fluid material ejection cartridge.

Secondly, the guide section 24 and the spray nozzle 26 of the nozzle 10 are located on the body 12. That is, the guide section 24 and the spray nozzle 26 are integrally formed with the body 12. This is different from the conventional fluid material spraying cartridges where the nozzle (with the guide section and spray nozzle located on the nozzle) and the nozzle shell (corresponding to the body 12 of this invention) are two-piece combinations. Therefore, the operation of the firing pin and the spraying of fluid materials will not be affected by the incorrect positioning of the nozzle. This invention eliminates issues such as spray volume control and eliminates the need for a nozzle retainer, a component in conventional fluid material spray cartridges, used to seal and hold the nozzle against the nozzle housing. It also avoids problems such as the nozzle retainer deteriorating (made of epoxy resin) due to prolonged exposure to high temperatures (and being damaged by the impact force transmitted from the nozzle to the retainer when struck by the firing pin). This innovation not only features a more streamlined overall structure, but also greater durability and a longer service life.

Furthermore, the larger diameter section 28 of the nozzle 26 is longer than the smaller diameter section 30, which reduces dummy run testing time and achieves a spray rate of 2.3 ug/spray.

In summary, the nozzle of the fluid material spray cartridge provided by this invention, through the coordinated design of the body, screw connection, and positioning shoulder, has a simple structure and is easy to assemble. It can be accurately positioned in the installation cavity of the valve body, ensuring the stability and reliability of the nozzle installation. In addition, with the guide part and the large and small diameter spray port structure, it can effectively guide the fluid material to converge and be sprayed stably, thereby improving the accuracy and consistency of spraying, avoiding problems such as leakage, dead volume, and uneven droplets, and has high application flexibility and long-term durability. Therefore, this invention not only improves upon the shortcomings of existing technologies but also has wide applicability in micro-dispensing and coating processes in the semiconductor, electronics, and optoelectronic industries, demonstrating genuine practical value. Consequently, this invention meets the requirements for a utility model patent, and thus, an application is filed in accordance with the law.

However, the above description is merely one preferred embodiment of this invention and should not be construed as limiting the scope of protection of this invention. Any simple equivalent changes or substitutions made based on the scope of this invention and the contents of the specification should still fall within the scope of protection covered by this invention.

12: The Body

14:Screw joint

16: Positioning Shoulder

21: Protruding mouth

22: Flow channel

24: Airflow Guide Section

26: Spray nozzle

28: Major Track

30: Short Track

Claims (6)

A nozzle structure for a fluid material spraying cartridge, the fluid material spraying cartridge being used to spray an appropriate amount of fluid material onto a substrate, the nozzle being disposed at the bottom end of the fluid material spraying cartridge and corresponding to the substrate, comprising: The device is a cylindrical body with its opening facing upwards. It has an internal flow channel, a flow guide section at the bottom, and a nozzle. The flow channel transports fluid material, which is ejected from the nozzle through the flow guide section. A threaded connection is provided at the top end of the main body, allowing the main body to be detachably threaded to a mounting cavity at the bottom end of a valve body of a fluid material injection cartridge; and A positioning shoulder, located on the outer side of the main body and corresponding to a stepped portion on the inner side of the mounting cavity, is used to limit the depth to which the main body locks into the mounting cavity and ensure accurate positioning of the main body; In this way, a striker inside the valve body can move vertically into the flow channel and correspond to the flow guide portion to control the opening and closing of the injection nozzle. The fluid material is precisely injected from the injection nozzle onto the substrate under the control of this striker. The nozzle structure of the fluid material spray cartridge as described in claim 1, wherein the spray port includes a large-diameter section and a small-diameter section, the large-diameter section being connected to the flow guide, and the small-diameter section being connected to the large-diameter section and the outside. The nozzle structure of the fluid material spray cartridge as described in claim 2, wherein the length of the large-diameter section is greater than that of the small-diameter section. The nozzle structure of the fluid material spray cartridge as described in claim 2, wherein a protruding nozzle is provided at the bottom end of the main body corresponding to the small-diameter section, and the small-diameter section penetrates the protruding nozzle. The nozzle structure of the fluid material spray cartridge as described in claim 1 or 2, wherein the guide portion is recessed into the inner wall of the bottom end of the body, and is in the shape of an inverted cone with a gradually decreasing cross-sectional area, so as to guide the fluid material to gradually converge to the spray nozzle. The nozzle structure of the fluid material spray cartridge as described in claim 1, wherein the positioning shoulder is located at one end of the screw connection and abuts against the stepped portion.