CN115674675A - Shower nozzle and three-dimensional inkjet printer - Google Patents

Abstract

The embodiment of the invention discloses a spray head and a three-dimensional printer, wherein the spray head comprises: the heating element is provided with a containing through cavity, and the containing through cavity penetrates through the heating element along a first direction; the throat pipe is provided with a first flow channel, one end of the throat pipe is connected into the accommodating through cavity from one end of the accommodating through cavity, and the throat pipe is used for conveying printing materials; the nozzle is provided with a second flow passage, one end of the nozzle is connected into the accommodating through cavity from the other end of the accommodating through cavity, and the ports of the first flow passage and the second flow passage at one end of the accommodating through cavity are in butt joint communication; the heat conducting part is arranged in the first flow passage, and heat emitted by the heating part is transferred to the heat conducting part through the throat pipe. Compared with the prior art that the printing material is heated through the inner wall of the throat pipe, the contact area between the printing material and the heating element can be increased by arranging the plurality of through holes, the heat transfer path can be shortened, the heating uniformity of the printing material can be improved, the printing material flowing to the nozzle is in a better molten state, and therefore the nozzle can extrude the printing material quickly.

Description

Shower nozzle and three-dimensional inkjet printer

Technical Field

The embodiment of the invention relates to the field of three-dimensional printing, in particular to a spray head and a three-dimensional printer.

Background

The three-dimensional printer is also called as a 3D printer, a three-dimensional model is manufactured by layering in a layer-by-layer stacking mode, and the working principle of the three-dimensional printer is that materials such as liquid photosensitive resin materials, molten plastic wires and gypsum powder are sprayed out by a nozzle device in a binder spraying or extruding mode, so that a three-dimensional entity formed by stacking and overlapping layer by layer is realized.

At present, the printing speed of a 3D printer is relatively low, and the time for printing a product by a user can be greatly reduced by high-speed printing. The printing speed is limited by the extrusion speed of the material, the heating efficiency of the print head. In the printing process, the material of shower nozzle is through heating the piece heating melting, and the material passageway center of nozzle leads to being close to the material melting of shower nozzle outer wall better because far away from the heating piece distance, and the material melting of keeping away from the shower nozzle outer wall is relatively poor, and the heating homogeneity is relatively poor, leads to can not carrying fully fused printing material to the shower nozzle, influences the printing speed simultaneously.

Disclosure of Invention

In view of the above problems, embodiments of the present invention provide a three-dimensional printer head and a three-dimensional printer, which overcome or at least partially solve the above problems.

In a first aspect, an embodiment of the present application provides a showerhead, including:

the heating element is provided with a containing through cavity, and the containing through cavity penetrates through the heating element along a first direction;

the throat pipe is provided with a first flow channel, one end of the throat pipe is connected into the accommodating through cavity from one end of the accommodating through cavity, and the throat pipe is used for conveying printing materials;

the nozzle is provided with a second flow passage, one end of the nozzle is connected into the accommodating through cavity from the other end of the accommodating through cavity, and the ports of the first flow passage and the second flow passage at one end of the accommodating through cavity are in butt joint communication;

the heat conducting piece is arranged in the first flow channel and provided with a plurality of through holes, the through holes penetrate through the heat conducting piece along the first direction, and printing materials in the throat pipe flow into the nozzle after passing through the through holes.

In one embodiment, the heat conducting member is at least partially located within the receiving cavity.

In one embodiment, the through holes include a first through hole, a second through hole and a third through hole, the first through hole and the third through hole are respectively located on two sides of the second through hole along the second direction, the first through hole and the third through hole are both arranged at an interval with the second through hole, and the second direction is perpendicular to the first direction.

In one embodiment, the width of the first through hole gradually increases from both ends toward the middle along the second direction;

along the second direction, the width of the third through hole gradually increases from the two ends to the middle.

In one embodiment, the width of the second through hole in the second direction gradually decreases from both ends toward the middle.

In one embodiment, the heat conducting member includes a first partition part and a second partition part, the first partition part is located between the first through hole and the second through hole along a vertical direction of the second direction to partition the first through hole and the second through hole, and a width of the first partition part is 0.3 mm to 0.5 mm;

the second partition part is located between the third through hole and the second through hole along the vertical direction of the second direction to partition the third through hole and the second through hole, and the width of the second partition part is 0.3-0.5 mm.

In one embodiment, the width of the first partition and/or the second partition is 0.4 mm.

In one embodiment, the heat conducting member further comprises a first base body and a second base body, the first base body and the second base body are respectively located at two ends of the second through hole along the second direction, one sides of the first base body and the second base body, which are far away from the second through hole, are edges of the heat conducting member, and the widths of the first base body and the second base body are both 0.3-0.5 mm.

In one embodiment, the heat conducting member further comprises a third base and a fourth base, the third base is located on one side of the first through hole, which is far away from the second through hole, and the edge of the heat conducting member is located on one side of the third base, which is far away from the first through hole; the fourth base body is located on one side, away from the second through hole, of the third through hole, the edge of the heat conducting piece is located on one side, away from the third through hole, of the fourth base body, and the width of each of the third base body and the fourth base body ranges from 0.3 mm to 0.5 mm.

In one embodiment, the profiles of the first through hole, the second through hole and the third through hole are all in circular arc transition.

In one embodiment, the first through hole, the second through hole and the third through hole are all symmetrical about the second direction, and/or the first through hole, the second through hole and the third through hole are all symmetrical about the third direction, and the third direction, the second direction and the first direction are perpendicular to each other two by two.

In one embodiment, the through holes are circular holes, each through hole is distributed around the center of the heat conducting member at intervals, and the included angle between the centers of any two adjacent through holes and the connecting line of the centers of the heat conducting members is 120 degrees.

In one embodiment, the wall surface of the accommodating through cavity is provided with an internal thread, one end of the throat pipe is provided with a first external thread, and the throat pipe is in threaded connection with one end of the heating element through the matching of the first external thread and the internal thread; the nozzle is provided with a second external thread, and the nozzle is screwed with the other end of the heating element through the matching of the second external thread and the internal thread.

In one embodiment, the thermally conductive member is integrally formed with the throat.

In a second aspect, embodiments of the present application provide a three-dimensional printer comprising a spray head according to any one of the preceding claims.

The embodiment of the invention has the beneficial effects that: unlike the prior art, the showerhead of the present embodiment includes a heating member, a throat, a nozzle, and a heat-conducting member. The heating member is provided with accepts logical chamber, accepts to lead to the chamber and runs through the heating member along the first direction. The choke is provided with first runner, and the one end of choke is connected in acceping logical intracavity from the one end of acceping logical chamber, and the other end protrusion of choke is in the heating member. The throat is used for conveying printing materials. The nozzle is provided with a second flow channel, and one end of the nozzle is connected in the accommodating through cavity from the other end of the accommodating through cavity. The first flow channel and the second flow channel are in butt joint communication with each other at the end of the containing through cavity, so that the printing material in the first flow channel can flow into the second flow channel. The heat conducting part is arranged in the first flow channel and provided with a plurality of through holes, the through holes penetrate through the heat conducting part along the first direction, and the printing material in the first flow channel of the throat pipe firstly flows into the through holes and then flows into the second flow channel of the nozzle. Because the heat-conducting member is arranged in the first flow channel, the heat emitted by the heating member is transferred to the heat-conducting member through the throat pipe. Compared with the prior art that the printing material is heated through the inner wall of the throat pipe, the contact area between the printing material and the heating element can be increased by arranging the plurality of through holes, the heat transfer path can be shortened, the heating uniformity of the printing material can be improved, the printing material flowing to the nozzle is in a better molten state, and therefore the nozzle can extrude the printing material quickly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a front view of a showerhead in an embodiment of the present invention;

FIG. 2 is a side view of a showerhead in an embodiment of the invention;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is a perspective view of a thermally conductive member of the sprinkler head in an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a heat conductive member of the showerhead in an embodiment of the present invention;

FIG. 6 is a perspective view of a heat conductive member of a sprinkler head according to another embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a heat conductive member of a sprinkler head according to another embodiment of the present invention.

Description of reference numerals:

100. a spray head; 10. a heating element; 110. a containing through cavity; 20. a throat; 210. a first flow passage; 30. a nozzle; 310. a second flow passage; 40. a heat conductive member; 410. a through hole; 4110. a first through hole; 4120. a second through hole; 4130. a third through hole; 4140. a fourth via hole; 4150. a fifth through hole; 4160. a sixth via hole; 420. a first partition; 430. a second partition part; 440. a first substrate; 450. a second substrate; 460. a third substrate; 470. a fourth substrate; 480a, a first connecting part; 480b, a second connecting part; 480c, a third connecting part; 480d, and a fourth connection portion.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.

First embodiment

Referring to fig. 1 and 2, the head 100 includes a heating member 10, a throat 20, a nozzle 30, and a heat-conducting member 40. For convenience of description, the first direction is referred to as v1, the second direction is referred to as v2, and the third direction is referred to as v3, and any two of the first direction, the second direction, and the third direction are perpendicular to each other.

The heating member 10 is substantially in the form of a block, and the heating member 10 is used to generate heat. The heating member 10 is provided with a housing through cavity 110, and the housing through cavity 110 penetrates the heating member 10 in the first direction V1. In the present embodiment, the heating member 10 is energized to emit heat. The direction in which the heating member 10 generates heat is not limited to the manner in which electricity is applied to generate heat.

Referring to FIG. 3, the throat 20 is generally tubular. The throat 20 is provided with a first flow channel 210, and the first flow channel 210 is a through channel. One end of the throat pipe 20 is connected to the accommodating through cavity 110 from one end of the accommodating through cavity 110, and the other end of the throat pipe 20 protrudes out of the heating element 10. The throat 20 is used to convey printing material, and in particular, the throat 20 conveys printing material through the first flow channel 210, and the printing material includes, but is not limited to, photosensitive resin, ABS plastic, PLA plastic, and the like.

The nozzle 30 is provided with a second flow passage 310, and one end of the nozzle 30 is connected to the accommodating through-cavity 110 from the other end of the accommodating through-cavity 110. The ports of the first flow channel 210 and the second flow channel 310 at one end of the through cavity 110 are in butt communication, so that the printing material in the first flow channel 210 can flow into the second flow channel 310. The printing material flowing into the second flow channel 310 is extruded through the nozzle 30 for printing.

Referring to fig. 3 and 4, the heat-conducting member 40 is disposed in the first flow channel 210, the heat-conducting member 40 is provided with a plurality of through holes 410, the through holes 410 penetrate through the heat-conducting member 40 along the first direction v1, and the printing material in the first flow channel 210 of the throat 20 flows into the through holes 410 and then flows into the second flow channel 310 of the nozzle 30. Since the heat-conducting member 40 is disposed in the first flow passage 210, the heat generated from the heating member 10 is transferred to the heat-conducting member 40 through the throat 20. Compared with the prior art in which the printing material is heated through the inner wall of the throat pipe 20, the arrangement of the plurality of through holes 410 increases the contact area between the printing material and the heating element 10, shortens the heat transfer path, improves the heating uniformity of the printing material, and enables the printing material flowing to the nozzle 30 to be in a better molten state, thereby facilitating the nozzle 30 to rapidly extrude the printing material.

According to a heat conduction formula Q = delta T/R = delta T lambda S/L, wherein Q, delta T, R, L, lambda and S are heat quantity, temperature difference, thermal resistance, thickness, heat conductivity coefficient and heat conduction area respectively. In the present invention, Q may represent the heat obtained by the printing material, and when the heating power of the heat source (heat generating member) is constant, the more heat obtained by the printing material represents the higher heat conduction efficiency of the heat conducting member 40.

According to the formula, on the premise that the change of materials is not considered (the materials mainly influence the heat conductivity coefficient lambda), the heat obtained by the printing materials is improved by increasing the heat conduction area S and reducing the thickness L.

Referring to fig. 3, the heat conduction member 40 is at least partially located in the accommodating through cavity 110, so that the distance between the heat conduction member 40 and a heat source (heating block) can be reduced, the distance L in the heat transfer process can be reduced, and the heating efficiency can be improved.

In another embodiment, the heat-conducting member 40 is entirely located in the receiving cavity 110, so as to further reduce the distance L during the heat transfer process, thereby improving the heating efficiency.

Referring to fig. 4 and 5, the through hole 410 includes a first through hole 4110, a second through hole 4120, and a third through hole 4130, the first through hole 4110 and the third through hole 4130 are respectively located at two sides of the second through hole 4120 along a second direction v2, and the second direction v2 is perpendicular to the first direction v 1.

In this embodiment, the first through hole 4110 is located on the left side of the second through hole 4120, and the third through hole 4130 is located on the right side of the second through hole 4120. The first through hole 4110 and the third through hole 4130 are spaced apart from the second through hole 4120, so that the printing material flowing through the heat conductive member 40 is divided into three streams, and the heat conductive member 40 heats each stream of the printing material.

Referring to fig. 5, along the second direction v2, the width of the first through hole 4110 gradually increases from two ends to the middle, that is, the first through hole 4110 is a substantially kidney-shaped hole. Along the second direction v2, the width of the third through hole 4130 gradually increases from the two ends to the middle, that is, the third through hole 4130 is a substantially kidney-shaped hole. The first through hole 4110 and the third through hole 4130 may be the same shape.

Referring to fig. 5, along the second direction V2, the width of the second through hole 4120 gradually decreases from the two ends to the middle, and the minimum width of the second through hole 4120, the maximum width of the first through hole 4110, and the maximum width of the third through hole 4130 are located on the same straight line along the third direction V3, so that the first through hole 4110, the second through hole 4120, and the third through hole 4130 having the above structure have a larger cross-sectional utilization ratio, which can reduce the influence of the thermal conductive member 40 on the flowing speed of the printing material, and meanwhile, since the printing material flowing out from the first through hole 4110, the second through hole 4120, and the third through hole 4130 has a better melting state, the nozzle 100 having the above structure can meet the requirement of high-speed printing.

Meanwhile, due to the fact that the printing material in the molten state is a non-Newtonian body, the two ends of the second through hole are wide, and the middle of the second through hole is narrow, the printing material is extruded towards the two ends by the middle of the second through hole, the printing material can be prevented from being gathered in the middle of the second through hole, the two ends of the second through hole are closer to a heat source, and the heating effect is better.

Referring to fig. 5, the heat-conducting member 40 includes a first partition 420 and a second partition 430. The first partition 420 is vertically positioned between the first through hole 4110 and the second through hole 4120 in the second direction v2 to partition the first through hole 4110 and the second through hole 4120. The thickness d1 of the first partition 420 is 0.3 mm to 0.5 mm. Because there is frictional force between printing material and the first separating part 420, the width of the first separating part 420 is too thin and can be damaged by the friction of the printing material, the width of the first separating part 420 is too thick, the flowing resistance of the printing material in a molten state is large, and the heating effect of the printing material can be reduced due to the large heat transfer distance L, so that the service life, the heating effect and the flowing resistance of the printing material of the first separating part 420 can be considered when the thickness d1 of the first separating part 420 is 0.3-0.5 mm, and a good balance is obtained among the three parts.

The second partition 430 is located between the third through hole 4130 and the second through hole 4120 in the vertical direction of the second direction v2 to partition the third through hole 4130 and the second through hole 4120. The thickness d2 of the second partition 430 is 0.3 mm to 0.5 mm. Because friction force exists between the printing material and the second separating part 430, the second separating part 430 is too thin and can be damaged by the friction of the printing material, the second separating part 430 is too thick and has large flow resistance to the printing material in a molten state, and the heating effect on the printing material can be reduced due to the large heat transfer distance L, so that the service life, the heating effect and the flow resistance of the printing material of the second separating part 430 can be considered when the thickness d2 of the second separating part 430 is 0.3-0.5 mm, and a good balance is obtained among the three parts.

In the prior art, the distance of heat transfer to the center of the throat 20 is a value corresponding to the radius of the throat 20, and in the present application, the distance of heat transfer to the center of the heat-conducting member is equal to one half of the width of the second through hole 4120 (for convenience of description, this value is denoted as S), and the heat-conducting member in the present application can significantly improve the heat-conducting efficiency because S is much smaller than the radius of the throat 20, and the loss of heat transfer in the heat-conducting member is not considered to be small.

Referring to fig. 5, the width of the first separating portion 420 and/or the second separating portion 430 is 0.4 mm, that is, the width d1 of the first separating portion 420 is 0.4 mm or the width d2 of the second separating portion 430 is 0.4 mm, and the width d1 of the first separating portion 420 and the width d2 of the second separating portion 430 are both 0.4 mm, so as to take into account the service life, the heating effect, and the flow resistance of the printing material of the first separating portion 420 and the second separating portion 430, and obtain a better balance among the three.

Referring to fig. 5, the heat-conducting member 40 further includes a first substrate 440 and a second substrate 450, and the first substrate 440 and the second substrate 450 are respectively located at two ends of the second through hole 4120 along the second direction v 2. The sides of the first substrate 440 and the second substrate 450 facing away from the second through hole 4120 are both edges of the heat-conducting member 40. In the present embodiment, the first base 440 is located above the second through hole 4120, and a side of the first base 440 facing away from the second through hole 4120 is an upper edge of the heat conducting member 40. The second base 450 is located below the second base 450, and a side of the second base 450 facing away from the second through hole 4120 is a lower edge of the heat-conducting member 40.

The widths of the first base 440 and the second base 450 are both 0.3 mm to 0.5 mm, the width of the first base 440 is equal to the widths of the first partition 420 and the second partition 430, and the width of the second base 450 is equal to the widths of the first partition 420 and the second partition 430. The width d3 of the first substrate 440 and the width d4 of the second substrate 450 are both 0.3 mm to 0.5 mm, which can reduce the probability that the first substrate 440 and the second substrate 450 are damaged by friction due to being too thin, and can also avoid the problem that heat is difficult to transfer to the printing material due to the first substrate 440 and the second substrate 450 being too thick.

Referring to fig. 5, the width d3 of the first substrate 440 and the width d4 of the second substrate 450 are 0.4 mm, so that the first substrate 440 and the second substrate 450 have a longer service life and lower heat loss.

Referring to fig. 5, the heat conducting element 40 further includes a third base 460 and a fourth base 470, the third base 460 is located on a side of the first through hole 4110 facing away from the second through hole 4120, and a side of the third base 460 facing away from the first through hole 4110 is an edge of the heat conducting element 40. In this embodiment, the third base 460 is located at the left side of the first through hole 4110, and an edge of the third base 460 facing away from the first through hole 4110 is a left edge of the heat conducting member 40.

The width d5 of the third substrate 460 is 0.3 mm to 0.5 mm, that is, the width d5 of the third substrate 460 is equal to the width d1 of the first partition 420 and the width d2 of the second partition 430, and the width d5 of the third substrate 460 is 0.3 mm to 0.5 mm, so that the probability that the third substrate 460 is damaged by friction due to being too thin can be reduced, and the problem that heat is difficult to transfer to the printing material due to the third substrate 460 being too thick can be avoided.

The fourth base 470 is located on a side of the third through hole 4130 away from the second through hole 4120, and a side of the fourth base 470 away from the third through hole 4130 is an edge of the heat conduction member 40. In this embodiment, the fourth base 470 is located at the right side of the third through hole 4130, and an edge of the fourth base 470 facing away from the third through hole 4130 is a right edge of the heat conduction member 40.

The width d6 of the fourth substrate 470 is 0.3 mm to 0.5 mm, that is, the width d6 of the fourth substrate 470 is equal to the width d1 of the first partition 420 and the width d2 of the second partition 430, and the width d6 of the fourth substrate 470 is 0.3 mm to 0.5 mm, so that the probability that the fourth substrate 470 is damaged by friction due to being too thin can be reduced, and the difficulty in transferring heat to the printing material due to too thick the fourth substrate 470 can be avoided.

Referring to fig. 5, the width d5 of the third substrate 460 and the width d6 of the second substrate 450 are 0.4 mm, so that the third substrate 460 and the fourth substrate 470 have a longer service life and lower heat loss.

Referring to fig. 5, the heating element 10 further includes a first connection portion 480a, a second connection portion 480b, a third connection portion 480c, and a fourth connection portion 480d. The first connection portion 480a is located between the first base 440 and the fourth base 470, two ends of the first connection portion 480a are respectively connected with the first base 440 and the fourth base 470, one side of the first connection portion 480a is an edge of the heat conduction member 40, and the other side of the first connection portion 480a is connected with the first separation portion 420.

The second connection portion 480b is located between the fourth base 470 and the second base 450, both ends of the second connection portion 480b are connected to the fourth base 470 and the second base 450, respectively, one side of the second connection portion 480b is an edge of the heat conductive member 40, and the other side of the second connection portion 480b is connected to the second partition portion 430.

The third connection portion 480c is located between the second base 450 and the third base 460, two ends of the third connection portion 480c are respectively connected to the second base 450 and the third base 460, one side of the third connection portion 480c is an edge of the heat-conducting member 40, and the other side of the third connection portion 480c is connected to the first separation portion 420.

The fourth connection portion 480d is located between the third base 460 and the first base 440, two ends of the fourth connection portion 480d are respectively connected to the third base 460 and the first base 440, one side of the fourth connection portion 480d is an edge of the heat-conducting member 40, and the other side of the fourth connection portion 480d is connected to the first separating portion 420.

Referring to fig. 5, the first through hole 4110, the second through hole 4120, and the third through hole 4130 are all configured with arc transitions to reduce the resistance to the printing material, so that the printing material in a molten state can flow toward the nozzle 30 at a higher speed after being heated uniformly.

Referring to fig. 5, in some embodiments, the first through hole 4110, the second through hole 4120 and the third through hole 4130 are all symmetric with respect to the second direction v2, and/or the first through hole 4110, the second through hole 4120 and the third through hole 4130 are all symmetric with respect to the third direction v3, that is, the first through hole 4110, the second through hole 4120 and the third through hole 4130 are all symmetric with respect to the second direction v2 and the first through hole 4110, the second through hole 4120 and the third through hole 4130 are all symmetric with respect to the third direction v3, the first through hole 4110, the second through hole 4120 and the third through hole 4130 are all symmetric with respect to the second direction v2 or the first through hole 4110, the second through hole 4120 and the third through hole 4130 are all symmetric with respect to the third direction v3, so as to increase the utilization ratio of the cross section of the heat conduction member 40. Wherein any two of the first direction v1, the second direction v2 and the third direction v3 are perpendicular to each other.

Referring to fig. 3, the wall surface of the accommodating cavity 110 has an internal thread, one end of the throat 20 has a first external thread, the first external thread is matched with the internal thread, the throat 20 is screwed with one end of the heating element 10 by matching the first external thread and the internal thread, and the throat 20 is screwed with the heating element 10, so that the advantages of firm connection and easy assembly and disassembly are provided.

The nozzle 30 is equipped with the second external screw thread, second external screw thread and internal thread looks adaptation, the nozzle 30 through the second external screw thread with the internal screw thread cooperation close and with the other end spiro union of heating member 10, the nozzle 30 has firm in connection and the advantage of the dismouting of being convenient for with the spiro union of heating member 10.

Referring to fig. 3, in some embodiments, the heat-conducting member 40 is integrally formed with the throat 20 such that the heat-conducting member 40 is fixed in the throat 20, thereby avoiding the need to install and fix the heat-conducting member 40. Meanwhile, the processing steps can be simplified, and the rapid production can be facilitated. The throat 20 and the heat conducting member 40 may be integrally formed by a 3D printing, injection molding or casting process.

Second embodiment

The present embodiment is different from the first embodiment only in the shape of the through hole 410 of the heat-conductive member 40, and the specific structure of the other components is the same as that of the first embodiment.

Referring to fig. 6 and 7, the through holes 410 are circular holes, and three through holes 410 are provided, wherein the three through holes 410 are a fourth through hole 4140, a fifth through hole 4150 and a sixth through hole 4160, respectively. The fourth through holes 4140, the fifth through holes 4150, and the sixth through holes 4160 are spaced around the geometric center of the cross-section of the heat conductive member 40, the center of any adjacent two through holes 410 and the center connecting line of the heat conductive member 40 have an included angle of 120 degrees, and the printing material flowing into the second flow channel 310 of the nozzle 30 first flows through the fourth through holes 4140, the fifth through holes 4150, and the sixth through holes 4160. The total surface area of the fourth through hole 4140, the fifth through hole 4150, and the sixth through hole 4160 is larger than the surface area of the inner sidewall of the first flow channel 210, so that the contact area with the printing material can be increased to improve the heating effect, and the heat conduction path is relatively shortened to further improve the heating effect.

In other embodiments, the through holes 410 are circular holes, the number of the through holes 410 is four or more, and the through holes 410 are disposed in a manner including, but not limited to, being spaced around the geometric center of the cross section of the heat-conducting member 40.

In summary, the showerhead 100 includes the heating member 10, the throat 20, the nozzle 30, and the heat-conducting member 40. The heating member 10 is provided with a receiving through cavity 110, and the receiving through cavity 110 penetrates the heating member 10 in the first direction v 1. The throat pipe 20 is provided with a first flow passage 210, one end of the throat pipe 20 is connected to the accommodating through cavity 110 from one end of the accommodating through cavity 110, and the other end of the throat pipe 20 protrudes out of the heating element 10. The throat 20 is used to convey printing material. The nozzle 30 is provided with a second flow passage 310, and one end of the nozzle 30 is connected to the accommodating through-cavity 110 from the other end of the accommodating through-cavity 110. The ports of the first flow channel 210 and the second flow channel 310 at one end of the through cavity 110 are in butt communication, so that the printing material in the first flow channel 210 can flow into the second flow channel 310. The heat-conducting member 40 is disposed in the first flow channel 210, the heat-conducting member 40 is provided with a plurality of through holes 410, the through holes 410 penetrate through the heat-conducting member 40 along the first direction v1, and the printing material in the first flow channel 210 of the throat 20 flows into the through holes 410 first and then flows into the second flow channel 310 of the nozzle 30. Since the heat-conducting member 40 is disposed in the first flow passage 210, the heat generated from the heating member 10 is transferred to the heat-conducting member 40 through the throat 20. Compared with the prior art that the printing material is heated through the inner wall of the throat pipe 20, the arrangement of the plurality of through holes 410 can increase the contact area between the printing material and the heating element 10, shorten the heat transfer path, improve the heating uniformity of the printing material, and enable the printing material flowing to the nozzle 30 to be in a better molten state, thereby facilitating the nozzle 30 to extrude the printing material quickly.

The present invention also provides a three-dimensional printer (not shown), which includes the above-mentioned spray head 100, and the specific structure of the spray head 100 can be referred to above, and will not be described in detail herein.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (15)

1. A spray head, comprising:

the heating element is provided with a containing through cavity, and the containing through cavity penetrates through the heating element along a first direction;

the throat pipe is provided with a first flow channel, one end of the throat pipe is connected into the accommodating through cavity from one end of the accommodating through cavity, and the throat pipe is used for conveying printing materials;

the nozzle is provided with a second flow passage, one end of the nozzle is connected into the accommodating through cavity from the other end of the accommodating through cavity, and ports of the first flow passage and the second flow passage, which are positioned at one end of the accommodating through cavity, are in butt joint communication;

the heat conducting piece is arranged in the first flow channel and provided with a plurality of through holes, the through holes penetrate through the heat conducting piece along the first direction, and the printing material in the throat pipe flows into the nozzle after passing through the through holes.

2. The spray head of claim 1, wherein the thermally conductive member is at least partially positioned within the receiving through-cavity.

3. The nozzle as claimed in claim 1, wherein the through holes comprise a first through hole, a second through hole and a third through hole, the first through hole and the third through hole are respectively located at two sides of the second through hole along a second direction, the first through hole and the third through hole are both spaced apart from the second through hole, and the second direction is perpendicular to the first direction.

4. The spray head of claim 3,

along the second direction, the width of the first through hole is gradually increased from two ends to the middle;

along the second direction, the width of the third through hole gradually increases from two ends to the middle.

5. The spray head of claim 4, wherein the width of the second through hole in the second direction gradually decreases from end to end in a direction toward the middle.

6. The showerhead of claim 3, wherein the heat conductive member includes a first partition and a second partition, the first partition being located between the first through hole and the second through hole in a vertical direction of the second direction to partition the first through hole and the second through hole, the first partition having a width of 0.3 mm to 0.5 mm;

the second partition part is located between the third through hole and the second through hole along the vertical direction of the second direction to partition the third through hole and the second through hole, and the width of the second partition part is 0.3-0.5 mm.

7. The spray head of claim 6, wherein the first partition and/or the second partition has a width of 0.4 mm.

8. The spray head of claim 6, wherein the heat conducting member further comprises a first base and a second base, the first base and the second base are respectively located at two ends of the second through hole along the second direction, one sides of the first base and the second base, which are away from the second through hole, are both edges of the heat conducting member, and the widths of the first base and the second base are both 0.3 mm to 0.5 mm.

9. The spray head of claim 8, wherein the thermally conductive member further comprises a third base and a fourth base, the third base being located on a side of the first through hole facing away from the second through hole, the side of the third base facing away from the first through hole being an edge of the thermally conductive member; the fourth base body is located on one side, away from the second through hole, of the third through hole, the edge of the heat conducting piece is located on one side, away from the third through hole, of the fourth base body, and the width of each of the third base body and the fourth base body ranges from 0.3 mm to 0.5 mm.

10. The spray head of any of claims 3 to 9, wherein the first through hole, the second through hole and the third through hole all have a profile that transitions in a circular arc.

11. Spray head according to any of claims 3 to 9, wherein the first through hole, the second through hole and the third through hole are all symmetrical with respect to the second direction and/or the first through hole, the second through hole and the third through hole are all symmetrical with respect to a third direction, the second direction and the first direction being perpendicular to each other two by two.

12. The nozzle of claim 1, wherein the through holes are circular holes, each through hole is spaced around the center of the heat conducting member, and the included angle between the centers of any two adjacent through holes and the connecting line of the centers of the heat conducting members is 120 degrees.

13. The nozzle of claim 1, wherein the wall of the receiving cavity is provided with an internal thread, one end of the throat is provided with a first external thread, and the throat is screwed with one end of the heating element by matching the first external thread with the internal thread; the nozzle is provided with a second external thread, and the nozzle is in threaded connection with the other end of the heating element through the matching of the second external thread and the internal thread.

14. The spray head of claim 13, wherein the thermally conductive member is integrally formed with the throat.

15. A three-dimensional printer comprising a spray head according to any one of claims 1 to 14.

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