TWI778308B - Nozzle device - Google Patents

Abstract

A nozzle device includes a main body connected to an outer pipe, a nozzle connected to the main body, and a cover connected to the main body and surrounding a portion of the nozzle and defining an annular chamber. The body includes a surrounding wall defining a channel. This channel is suitable for passing through an inner tube. The surrounding wall has a hole communicating with the channel and the outside. The nozzle includes a large-diameter hole and a small-diameter hole communicating with the channel, a conical surface section connecting the end surfaces of the adjacent small-diameter holes, and a guide section connecting the end surfaces of the adjacent large-diameter holes. The large-diameter hole is sleeved with the inner tube. The small-diameter holes are used to cause the passing carbon dioxide gas to generate particles due to a phase change. When the compressed gas enters the annular chamber through the orifice, a helical airflow will be generated in the annular chamber through the orifice, and flow along the conical surface section, and entrain the external airflow and particles to be sprayed forward. Thereby, the annular chamber restricts the airflow to flow only along the conical surface section, which can not only improve the flow velocity, but also improve the collimation degree during spraying.

Description

Nozzle device

The present invention relates to a nozzle device, in particular to a nozzle device capable of spraying carbon dioxide particles.

Effect)挾帶外界氣流與二氧化碳顆粒向前噴射，進而提升流速，並產生更好的噴射效果。 Referring to FIG. 1 , a conventional nozzle device 1 disclosed in US Patent No. 20070164130 is illustrated, which mainly includes a main body 11 and a nozzle 12 connected to the main body 11 . The body 11 has an axial hole 111 through which the compressed gas passes, and an annular chamber 112 communicated with the axial hole 111 and the outside. The nozzle 12 is used to spray carbon dioxide particles. Therefore, when the compressed gas is ejected from the axial hole 111 to the outside through the annular chamber 112, it will be caused by the Coanda effect.

Effect) entrains the external air flow and carbon dioxide particles to spray forward, thereby increasing the flow rate and producing a better spray effect.

However, since the annular chamber 112 has multiple turns, the gas pressure will be reduced due to the turns during the process of the compressed gas being discharged from the outside world, and it is important that after the compressed gas is discharged from the outside world, although some of the gas will flow along the The gas flows along the outer surface of the nozzle 12, but another part of the gas will overflow to the outside when it leaves the main body 11. so that the effect of increasing the flow rate still needs to be improved.

Therefore, the purpose of the present invention is to provide a nozzle device capable of increasing the flow rate and improving the spray collimation.

Therefore, the nozzle device of the present invention is suitable for connecting an outer pipe for transporting compressed gas and an inner pipe for transporting carbon dioxide gas, and the nozzle device comprises: a body, a nozzle, and a cover.

The body is connected to the outer tube, and includes a surrounding wall surrounding an axis and defining a channel, the channel is suitable for passing through the inner tube, and the surrounding wall has at least one hole communicating with the channel and the outside.

The nozzle is connected to the body, and includes a large-diameter hole and a small-diameter hole extending from one end surface to the other end surface along the axis direction and communicated with the channel, and a conical surface connecting the end surfaces of the adjacent small-diameter holes The large-diameter hole is suitable for socketing the inner tube, and the small-diameter hole is suitable for allowing the passing carbon dioxide gas to generate carbon dioxide particles due to phase change.

The outer cover is connected to the main body and surrounds the guide section and part of the conical surface section of the nozzle to define an annular chamber communicating with the at least one orifice. When the compressed gas enters the annular chamber from the at least one orifice, it will A helical air flow is generated in the annular chamber, and flows along the conical surface section, and carries the external air flow and carbon dioxide particles in the opposite direction to the body injection.

The effect of the present invention is that the annular chamber restricts the airflow to flow only along the conical surface section, which can not only improve the flow velocity, but also improve the collimation degree during spraying.

2: Outer tube

3: Inner tube

4: Ontology

40: Channel

41: Surrounding the Wall

411: First connection segment

412: Second connection segment

413: Third connection segment

414: Rim

415: Tunnel

5: Nozzle

51: Large diameter hole

52: Small diameter hole

53: Abutment surface

54: Cone segment

55: Introductory segment

6: cover

60: Ring Room

7: Air tight gasket

X: axis

L1: length

L2: length

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: Figure 1 is a cross-sectional view illustrating a conventional nozzle device disclosed in US Patent No. 20070164130; Figure 1 2 is a cross-sectional view illustrating an embodiment of the nozzle device of the present invention; FIG. 3 is an exploded perspective view of the embodiment; FIG. 4 is a combined perspective view of the embodiment; A cross-sectional view taken; and FIG. 6 is a cross-sectional schematic view of this embodiment.

2, 3 and 4, an embodiment of the nozzle device of the present invention is suitable for connecting an outer pipe 2 for conveying compressed gas and an inner pipe 3 for conveying carbon dioxide gas. The nozzle device includes a body 4 , a nozzle 5 , a cover 6 , and an airtight gasket 7 .

The body 4 includes a surrounding area surrounding an axis X and defining a channel 40 wall 41. The minimum diameter of the channel 40 is larger than the maximum outer diameter of the inner tube 3 , and is suitable for passing through the inner tube 3 . The surrounding wall 41 has a first connecting section 411 , a second connecting section 412 and a third connecting section 413 extending along the axis X direction, and is formed between the first connecting section 411 and the second connecting section 412 A rim 414. The first connecting section 411 is sleeved on the outer tube 2 . The outer diameter of the second connection segment 412 > the outer diameter of the third connection segment 413 . The third connecting section 413 has several holes 415 extending along the tangential direction and communicating with the channel 40 and the outside (as shown in FIG. 5 ). The rim 414 is adapted to abut the outer tube 2 .

The nozzle 5 is sleeved on the third connecting section 413 of the main body 4 and abuts against the ring edge 414 of the main body 4 , and includes a large nozzle extending from one end face to the other end face along the axis direction and communicating with the channel 40 . The diameter hole 51 and the small diameter hole 52, an abutment surface 53 defined between the large diameter hole 51 and the small diameter hole 52, a conical surface section 54 connecting the end face of the adjacent small diameter hole 52, and connecting A guide section 55 adjacent to the end face of the large diameter hole 51 . The large diameter hole 51 is suitable for socketing the inner tube 3 . The small-diameter holes 52 are suitable for generating carbon dioxide particles due to the phase change of the passing carbon dioxide gas. The abutting surface 53 abuts against the inner tube 3 to prevent the inner tube 3 from moving due to the internal compressed air pressure. The length L1 of the guide segment 55 along the axis X direction is greater than the length L2 of the tapered surface segment 54 along the axis X direction. And the outer diameter of the tapered surface section 54 gradually decreases from one end adjacent to the main body 4 to the other end away from the main body 4 .

The cover 6 is connected to the second connecting section 412 of the main body 4 and surrounds the guide section 55 and part of the conical section 54 of the nozzle 5 to define a communication with the holes 415 A ring of chamber 60. The outer cover 6 is tapered, and the outer diameter decreases from one end adjacent to the main body 4 to the other end away from the main body 4 .

The airtight gasket 7 is disposed between the large diameter hole 51 of the nozzle 5 and the second connecting section 412 of the main body 4 , and is suitable for blocking the compressed gas in the channel 40 of the main body 4 from entering the large diameter hole 51 of the nozzle 5 .

Referring to FIGS. 5 and 6 , when carbon dioxide gas flows through the inner tube 3 toward the small-diameter hole 52 of the nozzle 5, a phase change occurs due to the pressure difference and particles are generated, forming gaseous-solid coexisting carbon dioxide and carbon dioxide particles, and The carbon dioxide particles will roll larger and larger during the stroke of the small diameter hole 52 .

Effect)挾帶外界氣流依循該錐面段54朝遠離該本體4之方向流動，而與二氧化碳氣體匯集成流速更快、推進力更強、指向性更準直的氣流，同時挾帶二氧化碳顆粒噴射至外界。藉此，在切削製程中，可以藉由噴幅面積較小的噴射氣流與二氧化碳顆粒，順利地將工件表面的粉屑帶走，達到冷卻、清潔的效果。 When the compressed gas enters the channel 40 of the main body 4 through the outer pipe 2, the compressed gas will enter the annular chamber 60 from the channel 40 through the holes 415. Since the holes 415 extend along the tangential direction, relative to the The compressed gas sprayed by the outer cover 6 at an inclination angle will form a helical air flow that surrounds the axis X and follows the guide section 55 and the cone surface section 54 of the nozzle 5 under the condition of being obstructed by the outer cover 6 . After leaving the annular chamber 60, because of the Coanda effect (Coand

Effect) entraining the external air flow to follow the cone surface section 54 to flow away from the main body 4, and converging with the carbon dioxide gas to form an airflow with a faster flow rate, stronger propulsion, and more collimated directivity, while entraining carbon dioxide particles to spray to the outside world. In this way, in the cutting process, the jet air and carbon dioxide particles with a small spray area can smoothly take away the dust on the surface of the workpiece, so as to achieve the effect of cooling and cleaning.

It is worth noting that the outer pipe 2 is not limited to only transporting compressed gas. In other aspects of this embodiment, the outer pipe 2 can also be inserted through an intermediate pipe (not shown) for transporting lubricants. Therefore, the lubricant in the middle pipe (not shown in the figure) also enters the annular chamber 60 with the compressed gas in the outer pipe 2, and is mixed with the aforementioned gaseous-solid carbon dioxide and then sprayed to the outside, thereby achieving a lubricating effect, Improve the life of the machining tool and the smoothness of the workpiece surface.

Since those with ordinary knowledge in the art can infer the extended details according to the above description, no further description will be given.

Through the above description, the advantages of the foregoing embodiments can be summarized as follows:

1. Since the outer cover 6 surrounds the conical surface section 54 of the nozzle 5, the present invention can use the outer cover 6 and its annular chamber 60 to restrict the airflow to flow only along the conical surface section 54, thereby greatly reducing the overflow compression The gas can not only improve the flow rate of the jet airflow, but also more importantly, it can improve the collimation of the jet and reduce the spray width.

2. The inner tube 3 is fixed in the large diameter hole 51 of the nozzle 5, and the nozzle 5 is connected and fixed to the third connecting section 413 of the main body 4. Therefore, the stability between components can be enhanced and the shaking can be reduced. situation.

3. The holes 415 of the present invention extend along the tangential direction without any turning, which can reduce the loss of kinetic energy, and the generated spiral airflow can further reduce the spray width.

However, the above are only examples of the present invention, and should not be Limiting the scope of implementation of the present invention, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still within the scope of the patent of the present invention.

2: Outer tube

3: Inner tube

4: Ontology

40: Channel

41: Surrounding the Wall

411: First connection segment

51: Large diameter hole

52: Small diameter hole

53: Abutment surface

54: Cone segment

55: Introductory segment

6: cover

412: Second connection segment

413: Third connection segment

414: Rim

415: Tunnel

5: Nozzle

60: Ring Room

7: Air tight gasket

X: axis

L1: length

L2: length

Claims (10)

A nozzle device is suitable for connecting an outer pipe for transporting compressed gas and an inner pipe for transporting carbon dioxide gas, the nozzle device comprises: a body, connected to the outer pipe, and including a surrounding an axis and defining a channel. a wall, the channel is suitable for passing through the inner tube, the surrounding wall has at least one orifice communicating with the channel and the outside world; a nozzle is connected to the body, and includes extending from one end face to the other end face along the axis direction; A large-diameter hole and a small-diameter hole communicated with the passage, a conical surface section connecting the end face of the adjacent small-diameter hole, and a guide section connecting the end surface of the adjacent large-diameter hole, the large-diameter hole It is suitable for socketing the inner tube, the small diameter hole is suitable for the passing carbon dioxide gas to generate carbon dioxide particles due to phase change; and an outer cover connected to the main body and surrounding the guide section of the nozzle and part of the conical surface section, A ring chamber is defined that communicates with the at least one hole. When the compressed gas enters the ring chamber from the at least one hole, a helical airflow will be generated in the ring chamber, and flow along the conical surface section and carry the external airflow. The carbon dioxide particles are ejected against the direction of the body. The nozzle device according to claim 1, wherein the surrounding wall of the body has a first connecting section, a second connecting section and a third connecting section extending along the axis direction, and the first connecting section is sleeved on the The outer pipe, the second connecting section is sleeved on the outer cover, the third connecting section is sleeved on the nozzle, and has the at least one hole. The nozzle device according to claim 2, wherein the minimum hole diameter of the channel of the main body is greater than the maximum outer diameter of the inner tube, and the outer diameter of the second connecting section is greater than the The outer diameter of the third connecting segment. The nozzle device of claim 2, wherein the body further comprises an annular rim formed between the first connecting section and the second connecting section, the annular rim being adapted to abut against the outer tube. The nozzle device according to claim 2, further comprising an airtight gasket, which is arranged between the large-diameter hole of the nozzle and the second connecting section of the main body, and is suitable for preventing the compressed gas in the channel of the main body from entering The large diameter hole of the nozzle. The nozzle device of claim 1, wherein the nozzle further comprises an abutting surface defined between the large-diameter hole and the small-diameter hole, the abutting surface abutting against the inner tube. The nozzle device according to claim 6, wherein the length of the guide section of the nozzle along the axis direction is greater than the length of the cone section along the axis direction. The nozzle device according to claim 1, wherein the outer diameter of the conical surface section of the nozzle gradually decreases from one end adjacent to the body toward the other end away from the body. The nozzle device according to claim 1 or 8, wherein the outer cover is tapered, and the outer diameter decreases from one end adjacent to the main body toward the other end away from the main body. The nozzle device according to claim 1, wherein the surrounding wall of the body has several channels, and each channel extends in a tangential direction.

Images