CN115384191A

CN115384191A - Pulsation damper and ink-jet printer

Info

Publication number: CN115384191A
Application number: CN202211024229.XA
Authority: CN
Inventors: 乔纳森·摩根
Original assignee: Wuhan Leadjet Science And Technology Development Co ltd
Current assignee: Wuhan Leadjet Science And Technology Development Co ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2022-11-25
Anticipated expiration: 2042-08-24
Also published as: CN115384191B

Abstract

The invention discloses a pulsation damper and an ink-jet printer, relating to the technical field of ink-jet printing, wherein the pulsation damper is used for supplying ink to the ink-jet printer and comprises: the base is provided with a blind hole; the shell is fixed on the base, and a cavity communicated with the blind hole is formed in the shell; the damping mechanism comprises a step-shaped elastic pressing and holding piece and a supporting platform, the bottom end of the supporting platform is fixed in the blind hole, the top end of the supporting platform extends into the cavity, and the elastic pressing and holding piece penetrates through the supporting platform and can move between the top end and the bottom end of the supporting platform; and the diaphragm is positioned in the cavity and comprises an upper film attached to the elastic pressing piece and a lower film attached to the supporting table, the joint of the upper film and the lower film is fixed on the step, and the lower film is also fixed between the base and the shell. The invention can ensure that the printing ink is supplied under constant pressure, can better avoid the rupture of the diaphragm and prolong the service life of the diaphragm.

Description

Pulsation damper and ink-jet printer

Technical Field

The invention relates to the technical field of ink-jet printing, in particular to a pulsation damper and an ink-jet printer.

Background

Ink jet printers form images by propelling ink droplets toward a substrate, ink jet printers form images by generating ink droplets from multiple nozzles when desired, while continuous ink jet printers use electrostatics to deflect charged ink droplets from a single nozzle to multiple locations.

It is worth noting that the process of forming ink drops and charging ink drops requires ink to be supplied at a constant pressure, ideally without pressure pulsation. The presence of the pressure pulsation as the ink is ejected from the nozzle changes the velocity of the ejected ink, and thus the distance and time at which the ink drops separate from the ejected stream. The effect of the pressure pulsation can be observed by looking at the formation of the ink droplets in the presence of a light source which strobes at the frequency of the generation of the ink droplets and displays the so-called "bouncing ink droplets". It is also said that the time at which an ink droplet breaks off from an ink stream varies with time. This small change in pressure pulsation affects the amount of charge on the ink droplets, which is to be avoided because it can adversely affect print quality if the ink droplet charge is not satisfactory.

For this reason, most continuous inkjet printers incorporate a pulsation damper. There are currently two main types of pulsation dampers: spring-loaded displacement dampers and energy-storing dampers.

In a spring-loaded displacement damper, the device is divided into two compartments. The ink is passed under pressure through a first compartment and a second compartment contains a spring. The two compartments are separated by a membrane. The spring is attached to a membrane separating the two compartments and is compressed by the ink pressure. When pressure pulsations enter the damper, the spring compresses or expands to counteract the pulsations, thereby reducing the pulsation pulses. The advantage of the spring damper is that it does not require a large amount of ink to operate, but is prone to failure when the membrane or diaphragm ruptures or tears. One way to solve this problem is by including the pulsation damper in a replaceable filter module, but this does not solve the problem and increases the cost.

The accumulator damper includes an orifice that flows into a large compartment for containing a body of pressurized ink. The accumulator damper is fed into the spray head which contains an outlet which is a nozzle which itself is an orifice. Any pressure pulsations are compensated by a large volume of pressurized fluid because the fluid flow is small compared to the accumulated pressurized fluid volume. A disadvantage of energy storing dampers is that they require a large amount of liquid, which is essentially static, which may cause sedimentation, especially in pigmented inks. In addition, the orifice is easily clogged, thereby reducing its reliability.

Disclosure of Invention

In view of the defects in the prior art, the first aspect of the invention provides a pulsation damper, which can ensure that ink is supplied under constant pressure, can better avoid the rupture of a diaphragm, and can prolong the service life of the diaphragm.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:

a pulsation damper for supplying ink to an ink jet printer, comprising:

the base is provided with a blind hole;

the shell is fixed on the base, and a cavity communicated with the blind hole is formed in the shell;

the damping mechanism comprises an elastic pressing and holding piece and a supporting platform, the elastic pressing and holding piece is in a step shape, the bottom end of the supporting platform is fixed in the blind hole, the top end of the supporting platform extends into the cavity, and the elastic pressing and holding piece penetrates through the supporting platform and can move between the top end and the bottom end of the supporting platform; and

the diaphragm is located in the cavity and comprises an upper film and a lower film, the upper film is attached to the elastic pressing piece, the lower film is attached to the supporting table, the joint of the upper film and the lower film is fixed to the step, and the lower film is further fixed between the base and the shell.

In some embodiments, the resilient pressure retaining member comprises:

the pressing piece is of a cylinder-shaped structure with a closed top and an open bottom;

and one end of the elastic piece is accommodated in the pressing piece and abuts against the top of the pressing piece, and the other end of the elastic piece penetrates through the top end of the supporting platform and abuts against the blind hole.

In some embodiments, a protrusion for fixing the elastic member is further disposed in the blind hole.

In some embodiments, the resilient member is a spring.

In some embodiments, the axial length of the pressure holding member is greater than the axial length of the cylindrical structure formed by the upper film.

In some embodiments, the material of the pressure holding member is polytetrafluoroethylene.

In some embodiments, a portion of the support platform extending into the cavity is truncated cone-shaped.

In some embodiments, the bottom end of the lower membrane is further provided with an ear extending between the base and the housing, and the ear is fixed between the base and the housing by a flange.

In some embodiments, the connection between the upper membrane and the lower membrane is fixed to the step by a flange.

A second aspect of the present invention provides an ink jet printer which can ensure ink supply at a constant pressure, and can preferably prevent a diaphragm from breaking, and prolong the life of the diaphragm.

In order to achieve the purpose, the invention adopts the technical scheme that:

an ink jet printer comprising a pulsation damper as claimed in any one of the above.

Compared with the prior art, the invention has the advantages that:

in summary, the pulsation damper of the present invention includes a damping mechanism and a diaphragm, wherein the damping mechanism includes a step-shaped elastic pressing member and a support platform, the diaphragm includes an upper membrane attached to the pressing member and a lower membrane attached to the support platform, a joint of the upper membrane and the lower membrane is fixed on the step, and the support platform has a diameter larger than that of the pressing member, so that the upper membrane and the lower membrane can form a step shape. So, when pressing the piece when holding, going up the membrane and receiving to warp along radial after the extrusion, because the diameter of pressing the piece is less, the extension space of going up the membrane is comparatively sufficient, so can be fine avoid taking place the friction with the cavity, avoid breaking, simultaneously, because the junction of going up membrane and lower membrane is fixed on the step, can adopt the flange to fix the two usually. When pressing and holding the piece pressurized, the flange can fold slightly to allow the diaphragm to freely roll when pressing and holding the piece and reciprocate, lower membrane mainly takes place deformation in the direction of perpendicular to step, because the space of step top is comparatively sufficient, so can avoid lower membrane and cavity to take place the friction well, prolonged the life of diaphragm well.

Drawings

FIG. 1 is a schematic structural view of a pulsation damper in an embodiment of the present invention;

fig. 2 is a schematic view of a structure of a diaphragm when pressed according to an embodiment of the present invention.

In the figure: 1. a base; 11. blind holes; 12. a protrusion; 2. a housing; 21. a cavity; 22. an ink inlet; 23. an ink outlet; 3. a support table; 4. a diaphragm; 41. coating a film; 42. film laying; 5. a pressing member; 6. an elastic member; 7. and a seal.

Detailed Description

The invention will now be described in further detail, including the preferred embodiments, with reference to the accompanying drawings and by way of illustration of some alternative embodiments of the invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Further, in this application, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Referring to fig. 1, the embodiment of the invention discloses a pulsation damper for supplying ink to an inkjet printer, which includes a base 1, a housing 2, a damping mechanism, and a diaphragm 4.

The base 1 is provided with a blind hole 11, the housing 2 is fixed on the base 1, a cavity 21 communicated with the blind hole 11 is arranged in the housing 2, and the housing 2 is further provided with an ink inlet 22 and an ink outlet 23 for ink to flow.

Damping mechanism presses including the elasticity that is the step form and holds piece and brace table 3, and the bottom mounting of brace table 3 is in blind hole 11, and the top stretches into cavity 21, and elasticity is pressed and is held piece and is passed brace table 3 to can remove between the top and the bottom of brace table 3.

The diaphragm 4 is positioned in the cavity 21, the diaphragm 4 comprises an upper film 41 attached to the elastic pressing piece and a lower film 42 attached to the supporting table 3, the joint of the upper film 41 and the lower film 42 is fixed on the step, and the lower film 42 is further fixed between the base 1 and the shell 2.

It should be noted that the diaphragm 4 in the embodiment of the present invention is divided into two parts, i.e., an upper film 41 and a lower film 42, wherein the upper film 41 is attached to the elastic pressing member, and the lower film 42 is attached to the support base 3.

In some embodiments, the elastic pressing and holding piece comprises a pressing and holding piece 5 and an elastic piece 6, wherein the pressing and holding piece 5 is of a cylinder-shaped structure with a closed top and an open bottom; one end of the elastic element 6 is accommodated in the pressing element 5 and abuts against the top of the pressing element 5, and the other end of the elastic element passes through the top end of the supporting platform 3 and abuts against the blind hole 11.

Since the upper film 41 is attached to the holding member 5, the upper film 41 is also substantially cylindrical. Referring to fig. 1, the support base 3 has a diameter larger than that of the pressure holding member 5, so that both can be formed in a stepped shape. Thus, when the pressing member 5 is pressed, the upper membrane 41 will deform in the radial direction after being pressed, and since the diameter of the pressing member 5 is small and the extending space of the upper membrane 41 is sufficient, the upper membrane can be prevented from rubbing against the cavity 21 and from breaking, it can be understood that the size of the cavity 21 will be designed to have enough space to cope with the deformation of the upper membrane 41.

Meanwhile, since the connection part of the upper and

lower films

41 and 42 is fixed to the step, a flange may be generally used to fix the two. When the pressing member 5 is pressed, the flange is slightly folded to allow the diaphragm 4 to freely roll when the pressing member 5 moves up and down, as can be seen in fig. 2, the lower film 42 is mainly deformed in a direction perpendicular to the step, and since the space above the step is sufficient, friction between the lower film 42 and the cavity 21 can be well avoided, preferably, the portion of the supporting platform 3 extending into the cavity 21 is in a circular truncated cone shape, because the lower film 42 is attached to the supporting platform 3, the radial distance between the lower film 42 and the cavity 21 is increased, so that the deformation caused by the lower film 42 can be better coped with.

In some embodiments, the bottom end of the lower membrane 42 is further provided with an ear portion extending between the base 1 and the housing 2, and the ear portion is fixed between the base 1 and the housing 2 by a flange, so that the lower membrane 42 can be well fixed. In addition, in order to increase the sealing performance of the pulsation damper, a circular seal 7 is further provided at the flange of the fixing ear.

Further, in some embodiments, the axial length of the pressure holding member 5 is greater than the axial length of the cylindrical structure formed by the upper film 41. For example, the holding member 5 may be disposed so that a part thereof still extends into the support base 3 when it is located at the topmost end, so that the holding member 5 can be always in close contact with the inner wall of the support base 3 when it slides along the support base 3. That is, the holding member 5 can always move in the axial direction, and the stability of the pulsation damper is ensured.

Furthermore, in order to reduce the friction between the pressing member 5 and the supporting platform 3, the pressing member 5 in the embodiment of the present invention is usually made of a material with a low friction coefficient, such as teflon.

In some embodiments, in order to ensure the stability of the elastic element 6, a protrusion 12 for fixing the elastic element 6 is further provided in the blind hole 11. Preferably, the elastic member 6 in the embodiment of the present invention is a spring, and as can be seen from fig. 1, the protrusion 12 can be clamped on the inner wall of the spring to avoid the spring from shaking when the spring is pressed, so that the stability of the pulsation damper is further improved.

In summary, the pulsation damper of the present invention comprises a damping mechanism and a diaphragm 4, wherein the damping mechanism comprises a step-shaped elastic pressing member and a support base 3, the diaphragm 4 comprises an upper membrane 41 attached to the pressing member 5 and a lower membrane 42 attached to the support base 3, and a joint of the upper membrane 41 and the lower membrane 42 is fixed on the step, because the diameter of the support base 3 is larger than that of the pressing member 5, the two can form a step shape. Thus, when the pressing member 5 is pressed, the upper membrane 41 will deform in the radial direction after being pressed, and since the diameter of the pressing member 5 is small and the extending space of the upper membrane 41 is sufficient, friction with the cavity 21 and cracking can be avoided well, and meanwhile, since the connection between the upper membrane 41 and the lower membrane 42 is fixed on the step, a flange can be usually used to fix the two. When the pressing and holding piece 5 is pressed, the flange can be slightly folded to allow the diaphragm 4 to freely roll when the pressing and holding piece 5 moves up and down, the lower film 42 is mainly deformed in the direction perpendicular to the step, and the friction between the lower film 42 and the cavity 21 can be well avoided due to the fact that the space above the step is sufficient, and the service life of the diaphragm 4 is well prolonged.

Meanwhile, the embodiment of the invention also discloses an ink-jet printer which comprises a pulsation damper, wherein the pulsation damper comprises a base 1, a shell 2, a damping mechanism and a diaphragm 4.

The base 1 is provided with a blind hole 11; the shell 2 is fixed on the base 1, and a cavity 21 communicated with the blind hole 11 is arranged in the shell 2.

And the diaphragm 4 is positioned in the cavity 21, the diaphragm 4 comprises an upper film 41 attached to the elastic pressing piece and a lower film 42 attached to the supporting table 3, the joint of the upper film 41 and the lower film 42 is fixed on the step, and the lower film 42 is further fixed between the base 1 and the shell 2.

Further, the elastic pressing member includes a pressing member 5 and an elastic member 6.

The pressing piece 5 is of a cylinder-shaped structure with a closed top and an open bottom; one end of the elastic element 6 is accommodated in the pressing element 5 and is pressed against the top of the pressing element 5, and the other end passes through the top end of the support platform 3 and is pressed against the blind hole 11.

Further, a protrusion 12 for fixing the elastic member 6 is disposed in the blind hole 11.

Further, the elastic member 6 is a spring.

Further, the axial length of the pressure holding member 5 is larger than that of the cylindrical structure formed by the upper film 41.

Further, the material of the holding-down member 5 is polytetrafluoroethylene.

Further, the portion of the support platform 3 extending into the cavity 21 is in the shape of a circular truncated cone.

Further, the bottom end of the lower film 42 is provided with an ear portion extending between the base 1 and the housing 2, and the ear portion is fixed between the base 1 and the housing 2 by a flange.

Further, the joint of the upper film 41 and the lower film 42 is fixed to the step by a flange.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pulsation damper for supplying ink to an ink jet printer, comprising:

the base (1) is provided with a blind hole (11);

the shell (2) is fixed on the base (1), and a cavity (21) communicated with the blind hole (11) is formed in the shell (2);

the damping mechanism comprises a step-shaped elastic pressing and holding piece and a supporting table (3), the bottom end of the supporting table (3) is fixed in the blind hole (11), the top end of the supporting table extends into the cavity (21), and the elastic pressing and holding piece penetrates through the supporting table (3) and can move between the top end and the bottom end of the supporting table (3); and

diaphragm (4), it is located in cavity (21), diaphragm (4) are including pasting and establishing last membrane (41) on the elasticity pressure holding piece and pasting and establishing lower membrane (42) on brace table (3), the junction of going up membrane (41) and lower membrane (42) is fixed on the step, just lower membrane (42) still are fixed between base (1) and casing (2).

2. The pulsation damper according to claim 1, wherein said elastic pressing member comprises:

the pressing piece (5) is of a cylinder-shaped structure with a closed top and an open bottom;

and one end of the elastic piece (6) is accommodated in the pressing piece (5) and abuts against the top of the pressing piece (5), and the other end of the elastic piece penetrates through the top end of the supporting platform (3) and abuts against the blind hole (11).

3. A pulsation damper as claimed in claim 2, characterized in that: and a protruding part (12) for fixing the elastic piece (6) is also arranged in the blind hole (11).

4. A pulsation damper as claimed in claim 2, characterized in that: the elastic piece (6) is a spring.

5. A pulsation damper as claimed in claim 2, characterized in that: the axial length of the pressing piece (5) is larger than that of a cylindrical structure formed by the upper film (41).

6. A pulsation damper as claimed in claim 2, characterized in that: the material of the pressing and holding piece (5) is polytetrafluoroethylene.

7. A pulsation damper as claimed in claim 1, characterized in that: the part of the supporting platform (3) extending into the cavity (21) is in a circular truncated cone shape.

8. A pulsation damper as claimed in claim 1, characterized in that: the bottom of lower membrane (42) still is equipped with and extends to ear between base (1) and casing (2), ear passes through the flange to be fixed between base (1) and casing (2).

9. A pulsation damper as claimed in claim 1, characterized in that: the joint of the upper membrane (41) and the lower membrane (42) is fixed on the step through a flange.

10. An ink jet printer characterized by: comprising a pulsation damper as claimed in any one of claims 1 to 9.