JP2016114122A - Seal structure of valve, valve, liquid discharge device, and liquid coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealability.SOLUTION: A seal structure of a valve includes a cylinder having a valve seat, a shaft disposed in the cylinder, and a valve element disposed on the shaft. A through hole is formed on a part of the cylinder, one end portion of the shaft is passed through the through hole and disposed on the external of the cylinder, and a guide provided with a through passage for guiding the shaft, is disposed between a side face of the shaft and the through hole. A seal member having a hole through which the shaft is penetrated, and a pressing member for pressing the seal member are disposed on the end portion of the through hole of the cylinder successively toward one end portion of the shaft, the pressing member and the cylinder are fixed by a clamp member, the guide has a first recessed portion on a surface of the through passage of the guide at one end portion side of the shaft, and the first recessed portion is provided with a first spring seal member projecting at one end portion side of the shaft.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a valve seal structure, a valve, a liquid discharge apparatus, and a liquid coating apparatus.

  A liquid dropping device for dropping a small amount of liquid is known (Patent Document 1). This liquid dropping apparatus includes a syringe, a plunger rod that reciprocates in the syringe, and a spring seal member that seals a gap between the syringe and the plunger rod.

JP 2011-143362 A

  Patent document 1 is disclosing the technique which uses a spring seal, when sealing the clearance gap between a syringe and a plunger rod. When the spring seal disclosed in Patent Document 1 is used in the seal structure of this embodiment, the sealing performance may not be sufficiently maintained if there is no spring seal recess on the side from which the liquid flows out.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

(1) According to one aspect of the present invention, a valve seal structure is provided. The seal structure includes a cylinder having a valve seat, a shaft provided in the cylinder, and a valve body provided on the shaft. A through hole is provided in a part of the cylinder, and one end of the shaft is provided outside the cylinder through the through hole, and between the side surface of the shaft and the through hole. Comprises a guide provided with a through path for guiding the shaft. A seal member having a hole through which the shaft passes, and a pressing member that presses the seal member are sequentially provided at the end of the through hole toward the one end of the shaft, and the presser The member and the cylinder are fixed by a clamp member, and the guide has a first recess on the one end side of the shaft and on the surface of the guide passage, and the first recess A first spring seal member having a convex portion on the one end side of the shaft; According to this embodiment, since the first spring seal member has a convex portion on the one end side of the shaft, even if liquid leaks from the valve seat or the valve body side, the spring is expanded by the pressure of the liquid. As a result, the sealing performance is increased. Further, if the clamp member is removed, the seal member and the first spring seal member can be removed, so that the seal member and the first spring seal member can be easily removed and maintained.

(2) In the seal structure of the above aspect, the pressing member has a second recess on the seal member side and the shaft side, and the second spring seal in which the seal member side is convex in the second recess. A member may be provided. According to this aspect, since the second spring seal member is provided, the sealing performance can be improved. In addition, since the second spring seal member can be removed by removing the clamp member, the second spring seal member can be easily removed and maintained.

(3) In the seal structure of the above aspect, the guide may include a third recess on the valve seat side and the shaft side, and a third spring seal member may be provided in the third recess. According to this aspect, since the guide includes the third spring seal member on the valve seat side, the sealing performance can be improved.

  Note that the present invention can be realized in various modes. For example, it can be realized in the form of a valve, a liquid discharge device, a liquid coating device, etc. in addition to a valve seal structure.

Explanatory drawing which shows the catalyst ink coating apparatus of this embodiment. Explanatory drawing which shows the seal structure of 1st Embodiment. Explanatory drawing which shows operation | movement of a 1st spring seal part. Explanatory drawing which shows the seal structure of a reference example. Explanatory drawing which shows operation | movement of the 2nd spring seal part of a reference example. Explanatory drawing which shows the seal structure of 2nd Embodiment. Explanatory drawing which shows the seal structure of 3rd Embodiment.

  FIG. 1 is an explanatory view showing the catalyst ink coating apparatus of the present embodiment. The catalyst ink coating apparatus 10 is a liquid coating apparatus that coats the sheet 40 with the catalyst ink 30, and includes an ink tank 100, an ink supply pipe 110, a liquid feed pump 120, a first valve 20, and a first valve 20. 2 valve 21, ink delivery pipe 130, ink reflux pipe 135, die coater head 140, and roller 150.

  The ink tank 100 is a liquid tank that stores the catalyst ink 30 or a supply source. The catalyst ink 30 contains catalyst-carrying particles carrying a catalyst, an ionomer, and a solvent. As the catalyst, for example, platinum or a platinum alloy is used. For example, carbon particles such as carbon black are used as the catalyst-carrying particles. As the ionomer, for example, an ionic polymer such as perfluorocarbon sulfonic acid polymer is used. The solvent contains water and alcohol (for example, ethanol, 2-propanol (isopropyl alcohol)). The ink tank 100 may include a deaeration fan (not shown).

  The ink supply pipe 110 is a liquid flow path, the downstream side is branched into two, and is connected to the first valve 20 and the second valve 21, respectively. The liquid feed pump 120 is disposed on the ink supply pipe 110 at a position upstream of the branch point of the ink supply pipe 110. The first valve 20 is connected to the die coater head 140 via the ink delivery pipe 130. The die coater head 140 is a liquid discharge unit that forms a thin catalyst layer 35 on the sheet 40 conveyed on the roller 150. The second valve 21 is connected to the ink tank 100 via an ink reflux pipe 135 that is a reflux channel.

  The valves 20 and 21 have the same configuration, and include a cylinder 200, a valve body 210, a valve seat 220, a shaft 230, and a driving device 240, respectively. Hereinafter, the valve 20 will be described as an example. The cylinder 200 is a member having a substantially cylindrical space on the inner side. A valve seat 220 is formed on the inner wall of the cylinder 200. A shaft 230 is inserted into the cylinder 200, and a valve body 210 is connected to one end of the shaft 230. The other end of the shaft 230 protrudes to the outside of the cylinder 200 and is connected to the driving device 240. The driving device 240 drives the shaft 230 in a direction along the axis of the shaft 230. The portion where the shaft 230 protrudes from the cylinder includes a seal structure portion (hereinafter also referred to as “seal structure”).

  The first valve 20 and the second valve 21 have the same configuration, but operate in a state where the phases of the valve body 210 are different from each other. As shown in FIG. 1, when the valve body 210 of the first valve 20 is separated from the valve seat 220, the valve body 210 of the second valve 21 is seated on the valve seat 220. At this time, the catalyst ink 30 flows from the ink supply pipe 110 through the first valve 20 to the ink delivery pipe 130 and is discharged from the die coater head 140. On the other hand, the catalyst ink 30 flows from the ink supply pipe 110 to the second valve 21, but does not flow to the ink reflux pipe 135. Although not shown, conversely, when the valve body 210 of the first valve 20 is seated on the valve seat 220, the valve body 210 of the second valve 21 is separated from the valve seat 220. In this case, the catalyst ink 30 flows from the ink supply pipe 110 through the second valve 21 to the ink reflux pipe 135 and is returned to the ink tank 100. On the other hand, the catalyst ink 30 flows from the ink supply pipe 110 to the first valve 20, but does not flow to the ink delivery pipe 130. Accordingly, the catalyst ink 30 can be intermittently discharged from the die coater head 140 by alternately discharging the catalyst ink from the two valves 20 and 21.

Seal structure of the first embodiment:
FIG. 2 is an explanatory diagram showing a seal structure according to the first embodiment. A through hole 202 is provided in a part of the inside of the cylinder 200 and the shaft 230 passes therethrough. Between the side surface 232 of the shaft 230 and the through hole 202 of the cylinder 200, the shaft 230 is guided. A guide 260 having a through passage 262 is disposed. A Teflon packing 270 as a seal member is disposed on the drive device 240 (FIG. 1) side of the cylinder 200 and the guide 260 (“Teflon” is a registered trademark). The packing 270 need not be made of Teflon. The packing 270 is a perforated disk member (a perforated plate member) having a hole through which the shaft 230 passes. A pressing member 280 that presses the packing is arranged on the surface (the lower surface in FIG. 2) on the drive device 240 side of both surfaces of the packing 270. A flange 200 f is formed at the lower end of the cylinder 200 at a position in contact with the upper surface of the packing 270. The flange 200f is fixed by a clamp member 290 together with the pressing member 280. As the clamp member 290, for example, a sanitary clamp may be used.

  A first recess 264 is formed on the inner surface (that is, the shaft 230 side and the packing 270 side) of the lower end portion of the guide 260, and the first spring seal member 300 is disposed in the first recess 264. Has been. The shape of the first spring seal member 300 is formed of, for example, an annular plate material having a U-shaped cross section, and has a shape in which a convex portion corresponding to the U-shaped bottom portion protrudes toward the packing 270 side. That is, in this embodiment, the tip of the convex portion of the first spring seal member 300 is directed toward the packing 270 along the axial direction of the shaft 230, and the open side of the first spring seal member 300 is the shaft 230. It faces the side opposite to the pressing member 280 along the axial direction.

  In the first embodiment, if the clamp member 290 is removed, the pressing member 280, the packing 270, the first spring seal member 300, and the guide 260 can be easily removed, so Patent Document 1 (Japanese Patent Laid-Open No. 2011-143362). The maintainability is higher than the configuration shown in FIG.

  FIG. 3 is an explanatory view showing the operation of the first spring seal member 300. In the first spring seal member 300, the central curved plate 302 is made of metal, and a Teflon layer 304 is formed on both surfaces of the curved plate 302. The space between the shaft 230 and the pressing member 280 is sealed by a spring force that the opening side of the curved plate 302 tries to open. When pressure is applied to the catalyst ink 30 by the liquid feed pump 120 (FIG. 1), the catalyst ink 30 leaks from the guide 260. In the first embodiment, the first spring seal member 300 is open in the direction in which the catalyst ink 30 leaks. Therefore, the catalyst ink 30 enters the inside of the first spring seal member 300, and exerts a force F1 that opens the first spring seal member 300 more. As a result, the sealing performance by the first spring seal member 300 is enhanced.

Seal structure of reference example:
FIG. 4 is an explanatory view showing a seal structure of a reference example. The seal structure of the reference example is different from the seal structure of the first embodiment in the following points.
(I) The first recess 264 is not provided in the guide 260, and the first spring seal member 300 is not provided. (Ii) The second recess 284 is provided on the shaft 230 side and the packing 270 side of the pressing member 280. The second spring seal member 310 is disposed in the second recess 284.

  Also in the reference example, if the clamp member 290 is removed, the pressing member 280, the second spring seal member 310, the packing 270, and the guide 260 can be easily removed, so that the maintainability is the same as the seal structure of the first embodiment. However, the first embodiment is superior in terms of sealing performance, as will be described below.

  FIG. 5 is an explanatory view showing the operation of the second spring seal member 310 of the reference example. The second spring seal member 310 is substantially the same type as the first spring seal member 300, a central curved plate 312 is formed of metal, and a Teflon layer 314 is formed on both surfaces of the curved plate 312. However, the convex portion faces the packing 270, and the arrangement direction (U-shaped direction) is upside down. Therefore, the catalyst ink 30 flows from the convex side of the second spring seal member 310. Therefore, the catalyst ink 30 enters the gap between the second spring seal member 310 and the shaft 230 and the gap between the second spring seal member 310 and the pressing member 280, and the opening side of the second spring seal member 310 is narrow. A force F2 is applied. As a result, the sealing performance by the second spring seal member 310 is lowered.

  As described above, according to the seal structure of the first embodiment, if the clamp member 290 is removed, the pressing member 280, the packing 270, the first spring seal member 300, and the guide 260 can be easily removed. The maintainability is high, and the catalyst ink 30 enters the inside of the first spring seal member 300, and the force F1 that opens the first spring seal member 300 is applied, so that the seal performance by the first spring seal member 300 can be enhanced. .

Seal structure of the second embodiment:
FIG. 6 is an explanatory view showing a seal structure of the second embodiment. The seal structure of the second embodiment includes both the seal structure of the first embodiment and the seal structure of the reference example. That is, the guide 260 has a first recess 264 on the shaft 230 side and the packing 270 side, the first recess 264 includes the first spring seal member 300, and the holding member 280 has a first recess on the shaft 230 side and the packing 270 side. 2 recesses 284, and the second recesses 284 have a second spring seal member 310.

  According to the seal structure of the second embodiment, if the clamp member 290 is removed, the pressing member 280, the second spring seal member 310, the packing 270, the first spring seal member 300, and the guide 260 can be easily removed. High maintainability. Further, since the seal structure of the reference example is further provided in addition to the first seal structure, the seal performance of the seal structure of the second embodiment is equal to or greater than the seal performance of the seal structure of the first embodiment. .

Seal structure of the third embodiment:
FIG. 7 is an explanatory view showing a seal structure of the third embodiment. The seal structure of the third embodiment includes a third spring seal member 320 in addition to the seal structure of the second embodiment. That is, a third recess 268 is formed on the shaft 230 side of the guide 260 on the side opposite to the packing 270 (the valve body 210 and the valve seat 220 side in FIG. 1), and a third spring seal is formed on the third recess 268. A member 320 is provided. The shape of the third spring seal member 320 is the same as the shape of the first spring seal member 300 or the second spring seal member 310. The direction of the third spring seal member 320 may be convex upward (valve body 210, valve seat 220 side in FIG. 1) or convex downward (packing 270 side).

  Even in the seal structure of the third embodiment, if the clamp member 290 is removed, the pressing member 280, the second spring seal member 310, the packing 270, the first spring seal member 300, the guide 260, and the third spring seal member 320 are used. Since it can be easily removed, it is easy to maintain. Since the third spring seal member 320 is further provided in addition to the second seal structure, the seal performance of the seal structure of the third embodiment is the same as that of the seal structures of the first and second embodiments. It is equal or better.

  In the third seal structure, the second spring seal member 310 may not be provided. The maintainability does not change, and since the third spring seal member 320 is further provided in addition to the first seal structure, the seal performance is equal to or greater than the seal performance of the first seal structure.

Variations:
In the catalyst ink coating apparatus 10 of the present embodiment, two valves 20 and 21 are provided, and the catalyst ink 30 is intermittently ejected by alternately ejecting the catalyst ink, whereby the catalyst ink 30 is ejected onto the sheet 40. When the ink was not discharged, the catalyst ink 30 was refluxed to the ink tank 100. Here, the configuration may be such that only one valve 20 is provided instead of two. The catalyst ink can be discharged continuously. Further, by controlling the operation of the driving device 240 so as to increase the time during which the valve body 210 is in contact with the valve seat 220, intermittent discharge of the catalyst ink 30 is possible with one valve.

  In the present embodiment, the valve 20 does not transmit the catalyst ink 30 while the valve body 210 is in contact with the valve seat 220, and transmits the catalyst ink 30 while the valve body 210 is not in contact with the valve seat 220. Conversely, the catalyst ink 30 is allowed to pass through while the valve body 210 is in contact with the valve seat 220, and the catalyst ink 30 is allowed to pass while the valve body 210 is not in contact with the valve seat 220. The structure which does not permeate | transmit may be sufficient.

  In the present embodiment liquid, the valve 20 and the valve 21 have the same configuration, but the sizes of the valve 20 and the valve 21 may be different. The length of the intermittent application period and the non-application period can be adjusted. The length of the intermittent application period and the non-application period may be controlled by the driving device 240.

  In the present embodiment, the catalyst ink coating apparatus 10 has been described as an example. However, the described seal structure can be applied to the valve 20 alone or a liquid discharge apparatus that can discharge liquid.

  The embodiments of the present invention have been described above based on some examples. However, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and limit the present invention. It is not a thing. The present invention can be changed and improved without departing from the spirit and scope of the claims, and it is needless to say that the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Catalyst ink coating apparatus 20 ... 1st valve 21 ... 2nd valve 30 ... Catalyst ink 35 ... Catalyst layer 40 ... Sheet 100 ... Ink tank 110 ... Ink supply pipe 120 ... Liquid feed pump 130 ... Ink delivery pipe 135 ... Ink return pipe 140 ... Die coater head 150 ... Roller 200 ... Cylinder 200f ... Flange 202 ... Through hole 210 ... Valve element 220 ... Valve seat 230 ... Shaft 232 ... Side 240 ... Drive device 260 ... Guide 262 ... Through passage 264,268 ... concave portion 270 ... packing 280 ... pressing member 284 ... concave portion 290 ... clamp member 300 ... first spring seal member 302 ... curved plate 304 ... teflon layer 310 ... second spring seal member 312 ... curved plate 314 ... teflon layer 320 ... third Spring seal member F1 ... force F2 ... force

Claims (7)

A valve seal structure,
A cylinder having a valve seat;
A shaft provided in the cylinder;
A valve body provided on the shaft;
With
A through hole is provided in a part of the cylinder,
One end of the shaft is provided outside the cylinder through the through hole,
Between the side surface of the shaft and the through hole, provided with a guide provided with a through path for guiding the shaft,
At the end of the through hole,
A seal member having a hole through which the shaft passes;
A pressing member that presses the sealing member;
Are provided in order toward the one end of the shaft,
And the said pressing member and the said cylinder are being fixed by the clamp member,
The guide is
A first recess on the one end side of the shaft and on the surface of the through-passage of the guide;
A valve sealing structure comprising a first spring seal member in which the one end side of the shaft is convex in the first recess. The valve seal structure according to claim 1,
The pressing member has a second recess on the seal member side and the shaft side,
The second recess is provided with a second spring seal member that is convex on the seal member side,
Valve seal structure. The valve seal structure according to claim 1 or 2,
The guide is
A third recess on the valve seat side and the shaft side;
The third recess includes a third spring seal member.
Valve seal structure. A valve,
The valve seal structure according to any one of claims 1 to 3,
A driving device provided outside the pressing member and provided at the other end of the shaft, for driving the shaft;
With a valve. A liquid ejection device comprising:
A liquid flow path having one end connected to a liquid supply source;
The valve according to claim 4 connected to the other end of the liquid channel;
A liquid discharge unit connected to the valve;
Comprising
Liquid ejection device. A liquid ejection device comprising:
A liquid tank,
A liquid flow path branched into two on the downstream side, and a liquid flow path with an upstream end connected to the liquid tank;
A first valve and a second valve respectively connected to two downstream ends of the liquid flow path;
A liquid ejection unit connected to the first valve;
A reflux flow path connected to the second valve and the liquid tank;
With
The first valve and the second valve are the valves according to claim 4,
Liquid ejection device. A liquid coating apparatus,
A liquid ejection device according to claim 5 or 6,
A die coater head as the liquid discharge unit;
A liquid coating apparatus comprising:

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