CN103660572B - Fluid jetting head - Google Patents

Abstract

The invention discloses a liquid spray head. The spray head includes a nozzle body. The nozzle body has a plurality of interconnected and independent pressure generating channels inside. The nozzle body has a liquid inlet port and a plurality of liquid spray ports. Each spray liquid The mouth is connected with a pressure generating channel; each pressure generating channel wall is connected with an actuator, and the inner bottom wall of each pressure generating channel is fixed with a valve that cooperates with the actuator and can increase or decrease the cross-sectional area of the pressure generating channel. The blocking block is located between the liquid inlet and the liquid ejection port and is set opposite to the actuator. Since the blocking block is located in the liquid jet channel, when the ink is filled, the deformation of the actuator increases the opening of the liquid jet channel to realize rapid ink supply, and when the ink is ejected, the deformation of the actuator reduces the opening of the liquid jet channel. Small, reduce the loss of ink, so as to achieve high-frequency inkjet.

Description

liquid nozzle

technical field

The invention relates to liquid ink jet printing technology, in particular to a liquid jet head.

Background technique

As shown in FIG. 1 , the liquid spray head is composed of a plurality of connected and independent pressure generating channels 12, and the liquid is passed into the pressure generating channels 12 through the liquid inlet 33, and the piezoelectric element 300 and the piezoelectric element 300 are used. The vibrating plate that is driven to generate displacement is used as an actuator to eject the liquid stored in the pressure generating channel 12 through the liquid ejection port 21. Currently, there are mainly two types:

One is that the piezoelectric element 300 and the vibrating plate form the top wall of the pressure generating channel, the vibrating plate is composed of the lower electrode film 60, the elastic film 50 and the insulator film 55, and the piezoelectric element 300 is outside the pressure generating channel, through the piezoelectric The deformation of the element and the vibrating plate changes the volume of the pressure generating passage, thereby ejecting the liquid from the liquid ejection port 21 . In such a liquid ejection head, a blocking member is generally provided in the ink supply flow path to limit the loss of ink. Referring to the patent document CN201010143225.4 titled "Manufacturing Method of Liquid Jetting Head, Liquid Jetting Head and Liquid Jetting Device", as shown in Figure 1: the liquid jetting channel 13 and one end of the pressure generating channel 12 in the length direction communicated, and has a smaller cross-sectional area than the pressure generating channel 12. The pressure generating passage 12 is narrowed in the width direction to form a liquid ejection passage 13 whose width is smaller than that of the pressure generating passage 12. The liquid ejection passage 13 is used to increase the flow path resistance of the ink flowing from the communication passage 14 into the pressure generating passage 12. . In this embodiment, the cross-sectional area of the communication path 14 is the same as that of the pressure generating channel 12 . However, the structure in the reference literature limits the ink supply speed while limiting the ink loss, thereby reducing the printing speed.

As shown in FIG. 2 , another kind of cantilever beam structure or bridge beam structure is formed by arranging the vibrating plate 52 and the piezoelectric element 300 inside the pressure generating channel 12. The element 300 applies a voltage to vibrate the vibration plate of the cantilever beam or bridge beam, and the liquid entering through the liquid inlet 33 and stored in the pressure generating channel 12 is ejected from the liquid ejection port 21 due to the vibration of the vibration plate 52 . However, in these designs, there is no blocking member in the liquid ejection channel 13, so the loss of ink is relatively large during the ink ejection process. The function of the blocking part in the patent document CN201010143225.4 is to keep the pressure of the ink flow path constant, not to reduce the loss of ink during the inkjet process, and the setting of the blocking part in this patent document is only applicable In the case of placing the piezoelectric element on the outer surface of the chamber, it is not suitable for the bridge beam or the cantilever beam where the piezoelectric element is placed inside the chamber.

Contents of the invention

The invention provides a liquid spray head, which is used to overcome the defects in the prior art, and can realize rapid ink supply when filling ink, and reduce ink loss when ejecting ink, so as to realize high-frequency ink jetting.

The liquid spray head provided by the present invention comprises a nozzle body, the liquid spray head comprises a nozzle body, the inside of the nozzle body has a plurality of interconnected and independent pressure generating passages, and the nozzle body has a pressure generating passage communicated with all the pressure generating passages. The liquid inlet port and the liquid ejection port equivalent to the number of pressure generating channels, each of the liquid ejecting ports is connected to a pressure generating channel; the top wall of each of the pressure generating channels is connected to a vibrating plate and a piezoelectric element. Actuator, each pressure generating channel inner bottom wall is fixed with a blocking block that cooperates with the actuator and can conduct and disconnect the cross-sectional area of the pressure generating channel, and the blocking block is located between the liquid inlet and the spray liquid between the ports and opposite to the actuator.

In the liquid nozzle provided by the present invention, since the blocking block is arranged in the pressure generating channel, and the blocking block is located in the liquid jet channel, when the ink is filled, the piezoelectric element drives the vibrating plate to protrude upward and deform, increasing the opening of the liquid jet channel, realizing Rapid ink supply, when the ink is ejected, the piezoelectric element drives the vibrating plate to deform concavely, reducing the opening of the liquid jet channel and reducing the loss of ink, thus realizing high-frequency inkjet.

Description of drawings

Fig. 1 is the structural representation of prior art 1;

Fig. 2 is the structural schematic diagram of prior art 2;

Figure 3 is a top view of the liquid spray head provided by the present invention;

Fig. 4 is a sectional view along the A-B direction in Fig. 3 of Embodiment 1;

Fig. 5 is the reference schematic diagram when liquid nozzle is supplied in embodiment 1;

Fig. 6 is a reference schematic diagram when the liquid nozzle sprays liquid in the first embodiment;

Fig. 7 is the schematic diagram of the three-dimensional structure of the nozzle plate;

Fig. 8 is a sectional view along the A-B direction in Fig. 3 of Embodiment 2;

Fig. 9 is a reference schematic diagram when the liquid nozzle is supplied in the second embodiment;

FIG. 10 is a schematic diagram for reference when the liquid nozzle sprays liquid in the second embodiment.

detailed description

Embodiment one

As shown in Figures 3-6, this embodiment provides a liquid spray head, which includes a nozzle body with a plurality of interconnected and independent pressure generating passages 12 inside the nozzle body. The mouth 33 and the number of liquid injection ports 21 equivalent to the number of pressure generation channels 12, the liquid inlet 33 communicates with all pressure generation channels 12, and each liquid injection port 21 is connected to a pressure generation channel 12; each pressure generation channel 12 An actuator 5 consisting of a vibrating plate 52 and a piezoelectric element 300 is connected to the top wall, and an actuator 5 is fixed on the inner bottom wall of each pressure generating channel 12, which cooperates with the actuator 5 and can conduct and disconnect the pressure generation. The blocking block 4 of the cross-sectional area of the channel 12 is located between the liquid inlet 33 and the liquid ejection port 21 and opposite to the actuator 5 . The relative arrangement here specifically means that the blocking block 4 is arranged opposite to the actuator 5 in the deformation direction of the actuator 5 .

In the liquid nozzle provided by the present invention, since the blocking block is arranged in the pressure generating channel, when the ink is filled, the piezoelectric element drives the vibrating plate to protrude upward and deform, driving the pressure generating channel to change suddenly on the top wall, so that the pressure generating channel opens in the height direction Increase the size to achieve fast ink supply to meet the needs of high-frequency inkjet; when the ink is ejected, the piezoelectric element drives the concave deformation of the vibrating plate, which drives the concave deformation of the top wall of the pressure generation channel, so that the opening of the pressure generation channel decreases in height. Small to prevent ink backflow and reduce ink loss. The cross section of the blocking block 4 can be trapezoidal, and the long bottom end of the blocking block and the inner bottom wall of the pressure generating channel 12 fix the first gap. When the ink is supplied, it has little effect on the flow blocking of the liquid in the pressure generating channel, and when the ink is ejected, the flow blocking can be realized quickly, and the effect is good. In addition, the cross section of the blocking block 4 can also adopt a semi-circular or semi-elliptical shape. When the actuator 5 is not deformed, there is a first gap 22 between the top surface of the blocking block 4 and the inner top wall of the pressure generating channel 12 , and the first gap 22 is smaller than or equal to the elastic deformation of the actuator 5 . As a specific embodiment, a plurality of partition walls 9 are arranged along the width direction inside the nozzle body to divide the interior of the nozzle body into a plurality of pressure generating channels 12; one end of the partition 9 is fixed on an inner end wall of the nozzle body, and the other end is connected to the other inner wall of the nozzle body. A communication part 1 connecting all the pressure generating channels 12 is formed between the end walls; a liquid inlet 33 is provided on the top surface of the spray head body and communicates with the communication part 1 . The structure is simple, easy to manufacture, and the cost is low.

As shown in Figures 4-6, the actuator is located outside the pressure generating channel and is fixed on the outer top wall of the pressure generating channel. The pressure generating channel forms a liquid jet flow channel 13, and the liquid injection port 21 and the blocking block 4 are all located at the pressure generating channel. The bottom wall of the channel is generated, that is, the nozzle plate 3 . The structure of the nozzle plate 3 is shown in FIG. 7 .

The liquid flows into the communication part 1 from the liquid inlet 33 and then is divided into each independent pressure generating channel 12 separated by the partition wall 9 , as shown in FIG. 4 , the actuator is in a static state at this time. As shown in FIG. 5 , when a voltage is applied to the piezoelectric element 300, the actuator 5 is far away from the blocking block 4 to realize the pull-up process. At this time, the first gap 22 between the actuator 5 and the blocking block 4 on the nozzle plate becomes Larger, that is, the channel cross-sectional area between the top wall of the pressure generating channel under the actuator and the blocking block 4 becomes larger, and the liquid flows into the pressure generating channel 12 at a faster speed, thereby realizing high-speed filling of ink. After the pressure generating channel 12 is filled with ink, apply a voltage in the opposite direction to that shown in Figure 5 to the piezoelectric element 300, causing the piezoelectric element 300 to deform as shown in Figure 6, and the actuator drives the top of the pressure generating channel connected to it. As the wall approaches the nozzle plate, the actuator squeezes the ink in the pressure-generating channel 12 to eject the ink from the ejection orifice 21 . In this process, the first gap 22 between the actuator and the blocking block 4 on the nozzle plate becomes smaller, and even blocks the liquid jet flow channel 13, that is, the pressure below the actuator generates the inner wall of the channel 12 and the blocking block The cross-sectional area of the liquid spray channel 13 between 4 becomes smaller, preventing excessive liquid from backflowing back to the communication part 1, reducing the loss caused by the backflow liquid, so that more liquid is sprayed from the liquid spray hole 21.

Embodiment two

As a modification of Embodiment 1, as shown in Figures 8-10, the actuator is placed inside the pressure generating channel and fixed on the inner top wall of the pressure generating channel, the bottom surface of the actuator 5 is in contact with the inner bottom wall of the pressure generating channel Form the liquid jet flow channel 13; here the connection structure between the actuator and the pressure generating channel 12 is preferred. One end of the actuator 5 is suspended on the inner top wall of the pressure generating channel through the support seat 51, and the other end is fixed on the inner wall of the pressure generating channel. ; As shown in Figure 8, there is a second gap 23 between the top surface of the actuator 5 and the inner top wall of the pressure generating channel 12, the second gap 23 is greater than the deformation of the actuator 5, and the bottom surface of the actuator 5 is in contact with the stopper. There is a third gap 24 between the top surfaces of the block 4, and the third gap 24 is smaller than or equal to the deformation amount of the actuator.

As shown in Figure 9, when the actuator 5 is suddenly deformed, the third gap 24 increases, and the opening of the liquid jet channel 13 increases to realize rapid ink supply to meet the high-frequency inkjet requirements. There will be no contact between the vibrating plate 52 and the inner top wall of the pressure generating channel, the actuator will not be constrained by the pressure generating channel during the deformation process, and the deformation requirement can be achieved by applying a relatively small voltage to the piezoelectric element; As shown in FIG. 10 , when ink is ejected, the actuator 5 is concavely deformed, the third gap 24 is reduced, and the opening of the liquid jet flow channel 13 is reduced or even blocked, so as to prevent reverse flow of ink and reduce ink loss. In addition, the actuator can also be attached to the inner top wall of the pressure generating channel, that is, the second gap is zero. This connection structure must apply a relatively large voltage to the piezoelectric element to drive the pressure generating channel attached to it. The wall produces a sudden upward deformation or a concave deformation.

As shown in FIG. 3 , the liquid flows into the communication part 1 from the liquid inlet 33 and then is distributed to each pressure generating channel 12 separated by the partition wall 9 , as shown in FIG. 8 : the actuator is in a static state at this time. As shown in Figure 9: when the voltage is applied to the piezoelectric element 300, the actuator moves away from the nozzle plate to realize the process of pulling up, at this time, the third gap 24 between the bottom surface of the actuator and the top surface of the blocking block 4 on the nozzle plate becomes Larger, that is, the cross-sectional area of the liquid jet channel 13 becomes larger, and the liquid flows into the pressure generating channel 12 at a faster speed, thereby realizing high-speed filling of ink. After the pressure generation channel is filled with ink, apply the opposite voltage to the actuator as shown in Figure 9, so that the deformation of the piezoelectric element is shown in Figure 10, and the actuator approaches the nozzle plate 3, and the actuator squeezes the pressure generation channel 12, the ink is ejected from the liquid ejection port 21, and in this process, the third gap 24 between the bottom surface of the actuator and the top surface of the stopper 4 on the nozzle plate becomes smaller, that is, the cut-off of the liquid jet channel 13. The area becomes smaller, and even the liquid spray channel 13 is blocked to prevent excessive liquid backflow to the communication part 1 and reduce the loss caused by the backflow liquid, so that more liquid is ejected from the liquid spray port 21 .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (5)

1. a fluid jetting head, this fluid jetting head comprises a head body, this head body inside has manyIndividual being interconnected and pressure independent of each other generation passage, described head body has one and produces with all pressureThe inlet that raw passage is all communicated with and the mouth spray suitable with pressure generation number of channels, described inlet is establishedOn the end face of described head body, described mouth spray is located on the diapire of pressure generation passage, Mei GesuoState pressure of the corresponding connection of mouth spray and produce passage; Each described pressure produces on passage roof and all connectsOne actuator being made up of oscillating plate and piezoelectric element, is characterized in that, each pressure produces the end in passageOn wall, being all fixed with one coordinates with actuator and can strengthen and reduce stopping of pressure generation cross-sectional areaPiece, described stopper is oppositely arranged between inlet and mouth spray and with actuator.

2. fluid jetting head according to claim 1, is characterized in that, described actuator is fixed on instituteState pressure and produce on the outer roof of passage, stopper end face and pressure produce between passage inner roof wall to be had and is less thanOr equal the first gap of actuators deform amount.

3. fluid jetting head according to claim 1, is characterized in that, described actuator is fixed on pressurePower produces on passage inner roof wall, and described actuator is elongated; Hang by supporting seat described actuator one endBe located at pressure and produce on passage inner roof wall, the other end is fixed on pressure and produces in vias inner walls; Described actuatingDevice end face and pressure produce between passage inner roof wall, have be more than or equal to actuators deform amount second betweenGap, has the actuators deform amount that is less than or equal between described actuator bottom surface and described stopper end faceThird space.

4. according to the arbitrary described fluid jetting head of claim 1-3, it is characterized in that described head bodyInner broad ways is arranged with multiple next doors and is divided into multiple described pressure generation passages; One end, next doorBe fixed in head body one inner end wall, between another inner end wall of the other end and head body, form and be communicated with instituteThere is pressure to produce the interconnecting part of passage; Inlet is located on this head body end face and with this interconnecting part and is communicated with.

5. according to the arbitrary described fluid jetting head of claim 1-3, it is characterized in that described stopper horizontal strokeIt is trapezoidal that cross section is, described in stop that block length base end and pressure produce diapire in passage and fixes.