JP2016048155A - Sight glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the exfoliation of a transparent protection sheet which directly protects a transparent member (glass), and to prevent the lowering of visibility caused by the breakage and contamination of the transparent member.SOLUTION: A transparent protection material 10 which protects the glass 6 of side glass is constituted of a transparent protection sheet 12 (lower layer sheet) which is directly pasted on the glass 6, and a label sheet 11 (upper layer sheet) which is pasted on a surface of the transparent protection sheet 12. An annular step part 13 whose thickness is equivalent to a thickness t of the transparent protection sheet 12 is formed at an internal peripheral face of an attachment frame body 7 to which the glass 6 is attached, and the transparent protection sheet 12 is pasted on a surface of the glass 6 and a bottom of the step part 13. By this constitution, the surface of the transparent protection sheet 12 and an upper surface of the attachment frame body 7 becomes flush with each other substantially continuously, and the label sheet 11 at an upper layer side is flatly pasted so as to straddle the surface of the transparent protection sheet 12 and the upper surface of the attachment frame body 7.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a sight glass for monitoring the state of a fluid flowing in a pipeline, and more particularly to a sight glass suitable for preventing damage to a transparent member such as glass for visually confirming the state of a fluid.

  Conventionally, if moisture exists in the refrigerant in the refrigeration cycle, there is a risk of causing a malfunction of the refrigeration cycle. Therefore, the present inventor has already used the sight glass disclosed in Patent Document 1 as means for determining the state of the refrigerant. Invented and it has been published.

Patent Document 1 according to the inventor's invention provides a sight glass capable of quickly and accurately confirming the state of fluid and the presence of moisture in the fluid without obstructing the flow of fluid such as refrigerant. It is. The sight glass shown here has a refrigerant inlet and outlet, a main body having a flow path from the inlet to the outlet inside, a glass covering the upper opening of the main body, and moisture in the refrigerant is detected. Moisture indicator that is placed on one side of the flow path and supporting the moisture indicator in a state where a part of the moisture indicator is exposed in the coolant and the exposed part is close to the side facing the inside of the glass body And a supporting member. And since a moisture indicator, a support member, etc. do not prevent the movement of the refrigerant | coolant which passes through the said sight glass, a pressure loss is small.
This sight glass has a moisture indicator for confirming the state of the refrigerant and a viewing window fitted with glass in the opening for visually recognizing the moisture indicator, and the moisture indicator in the sight glass is confirmed from the viewing window. This makes it possible to confirm not only the state of the refrigerant passing through the sight glass but also the presence of moisture in the refrigerant.

JP 2011-43249 A

  By the way, the sight glass shown in Patent Document 1 has a structure in which the glass surface for confirming the passing refrigerant and the internal moisture indicator is directly exposed to the outside, so that the glass surface is susceptible to dirt, fine scratches and dirt. In addition, there remains a concern that the visibility when checking the passing refrigerant and the moisture indicator is reduced if the glass surface is stained or has fine scratches or dirt.

  As a method for preventing such a decrease in visibility, for example, as shown in FIG. 5 (a), a transparent protective sheet c is attached to the surface of the glass b that is mounted so as to close the viewing window a of the sight glass, When the surface of the transparent protective sheet c is damaged or dirty, it is conceivable to keep the visibility from the glass b in a good state by peeling the transparent protective sheet c and replacing it with a new transparent protective sheet c.

  However, simply by attaching a single transparent protective sheet c to the entire top surface of the sight glass, as shown in FIG. 5 (a), the outer peripheral portion of the opening d for attaching the glass b is obliquely upward. When the external force F is applied, the peripheral edge portion of the transparent protective sheet c may be partially curled and the transparent protective sheet c may be easily peeled off.

  In such a structure, even when the transparent protective sheet c is damaged, it is possible to peel the damaged transparent protective sheet c and replace the new transparent protective sheet c with the glass b. There is a concern that the surface of the glass b may become dirty or scratched between the time when c is peeled off and a new transparent protective sheet, and there is a problem that it is difficult to maintain the visibility of the moisture indicator for a long time. It remained.

  Therefore, the present invention has been made in view of the above-described conventional problems, and enhances the peel resistance of the transparent protective sheet material that protects the transparent member provided in the viewing window, and improves the visibility from the transparent member. An object of the present invention is to provide a sight glass that can be kept in a good state for a long time.

  In order to achieve the above object, a sight glass according to the present invention includes a main body having an inflow port and an outflow port of fluid to form the flow path of the fluid therein, and a fluid passing through the flow path. A mounting frame provided with a viewing window for observation; a transparent member that seals the opening of the viewing window; and a transparent protective material attached to a surface of the transparent member, the transparent protective material being the transparent It is composed of a transparent lower layer sheet to be attached to the surface of the member and a transparent upper layer sheet to be attached to the lower layer sheet, and the upper layer sheet includes the outer peripheral edge of the opening so as to cover the surface of the lower layer sheet. It is characterized by being pasted.

  The sight glass according to the present invention is characterized in that the lower layer sheet is larger than the transparent member, and the upper layer sheet is larger than the lower layer sheet.

  Further, the sight glass according to the present invention has an annular step portion having a depth corresponding to the thickness t of the lower layer sheet at the inner peripheral edge of the mounting frame and substantially the same as the outer diameter of the lower layer sheet. The transparent member is fitted to the inner peripheral surface of the opening so that the bottom of the step and the upper surface of the transparent member are substantially flush with each other, and straddles the transparent member and the step. The lower layer sheet is pasted, and the upper layer sheet is pasted so as to straddle the lower layer sheet and the outer surface of the opening of the mounting frame.

  Moreover, the sight glass according to the present invention is characterized in that the upper layer sheet is replaceable.

  In addition, the sight glass according to the present invention further includes a moisture indicator for detecting moisture of the fluid passing through the flow path, and the moisture content detected by the moisture indicator is determined on an outer peripheral side of the upper layer sheet. A comparison display unit is formed.

  According to the sight glass of the present invention, the transparent protective material protecting the transparent member is composed of two layers of sheets (upper sheet and lower layer sheet) that are stacked one on top of the other, thereby increasing the thickness of the transparent protective material. The impact resistance to the member can also be improved.

  In addition, the lower layer sheet is attached to the surface of the transparent member in a state where the peripheral edge portion is not directly exposed to the outside but within the stepped portion formed on the inner peripheral surface of the opening, and the upper layer sheet is attached to the surface of the lower layer sheet. Therefore, even if an external force F is applied to the upper surface of the mounting frame, the external force F acts only on the upper sheet and the tip of the mounting frame, and the external force F is not directly applied to the lower sheet. Therefore, the lower layer sheet that protects the transparent member is not peeled off. For this reason, even if the periphery of an upper layer sheet peels off, the surface of a transparent member can be reliably protected by a lower layer sheet, and the visibility of a transparent member can be maintained stably over a long period of time. This effect is exhibited even when only one upper layer sheet is attached.

  Further, when the upper layer sheet is damaged or soiled, it can be replaced, and a reduction in visibility can be prevented.

1 is an overall sectional view of a sight glass showing an embodiment of the present invention. It is a top view of the sight glass which shows one Example of this invention. It is the perspective view which expanded the viewing window which shows one Example of this invention, and notched one part. FIG. 4A is an enlarged sectional view of a viewing window showing an embodiment of the present invention, FIG. 4A is a diagram for explaining an external force applied to a transparent protective material, and FIG. 4B is a diagram in which a label sheet is peeled off by the action of the external force. FIG. FIG. 5A is an enlarged cross-sectional view of a viewing window showing a conventional example of the present invention, FIG. 5A is a diagram for explaining an external force applied to the transparent protective material, and FIG. 5B is a diagram showing the transparent protective material peeled off by the action of the external force. FIG.

  Hereinafter, examples of the present invention will be described by taking the case where the present invention is applied to a sight glass used in a refrigeration cycle such as an air conditioner as an example.

  1 to 4 show an embodiment of the sight glass 1 of the present invention. As shown in the figure, the sight glass 1 sandwiches a hollow main body 2 having a flow path 2d through which the refrigerant C passes, a moisture indicator 3 for detecting moisture in the refrigerant C, and the moisture indicator 3. First and second support members 4, 5, a transparent member (specifically glass) 6 attached to a viewing window 2 c provided on the upper part of the main body 2, and a mounting frame for attaching the glass 6 to the main body 2 A body 7 and fluid ports 20 and 21 connected to the piping of the refrigeration cycle.

  A short tubular tube portion 8 for attaching the glass 6 is connected to the upper portion of the main body 2 so as to communicate with the flow path 2 d, and the mounting frame body 7 is attached to the upper end edge of the tube portion 8. ing. An opening 7a serving as a viewing window 2c is formed in the center of the mounting frame 7, and the opening 7a is sealed with the glass 6 by fitting the glass 6 to the inner peripheral surface of the opening 7a. ing.

  The moisture indicator 3 is made of disk-shaped paper or the like, and changes its color due to moisture in the refrigerant C that has come into contact. The first support member 4 for supporting the moisture indicator 3 includes a cylindrical portion 4a, and integrally forms a strip-shaped rib 4b so as to connect the central portion of the lower end of the cylindrical portion 4a in the diametrical direction. A flange 4c is integrally formed from the upper end of 4a to the outside. The second support member 5 is provided to press and hold the moisture indicator 3 accommodated in the recess formed in the rib 4 b of the first support member 4 from above, and is placed on the first support member 4. By holding the moisture indicator 3 while being pressed from above by the second support member 5, the moisture indicator 3 is held between the first and second support members 4, 5 with the upper surface exposed.

  Moreover, the collar part 4c of the 1st support member 4 is mounted in the cylinder part 8 of the main body 2, and fixes the attachment frame body 7 to which the glass 6 was mounted | worn to the cylinder part 8 via the collar part 4c. Thus, the moisture indicator 3 is supported in a state of being opposed to the inner surface of the glass 6, and the presence of moisture can be confirmed by observing the color of the upper surface of the moisture indicator 3 through the glass 6.

  A transparent protective material 10 for protecting the glass 6 is attached to the surface of the glass 6 for confirming the moisture indicator 3. This transparent protective material 10 is composed of upper and lower two-layer sheets (seal), and a lower transparent protective sheet (lower layer sheet) 12 is directly attached to the surface of the glass 6 and is an upper layer label having a comparison display section to be described later. A sheet (upper sheet) 11 is attached to the surface of the mounting frame 7 including the transparent protective sheet 12.

  Further, as shown in FIG. 2, the label sheet 11 has a transparent portion 14 at the center for visually recognizing the moisture indicator 3, and a comparison such as “WET”, “DRY”, etc. is provided around the label portion. The display portion 15 is formed, and the display color of the “WET” portion corresponds to the color that changes when moisture in the refrigerant C of the moisture indicator 3 is detected, and the color of the “DRY” portion is the moisture indicator 3 Corresponds to the display color corresponding to the original color (color when there is no moisture). That is, on the outer peripheral side of the label sheet 11, a comparison display unit 15 for determining the amount of moisture detected by the moisture indicator 3 is formed. Thereby, when checking the moisture indicator 3 through the transparent part 14 and the transparent protective sheet 12 of the label sheet 11, and the glass 6, the presence or absence of moisture in the refrigerant C can be instantaneously determined by the comparison display part 15.

  Thus, in the best embodiment of the present invention, the glass 6 is protected by the two-layer transparent protective material 10, the surface of the glass 6 is protected by the lower transparent protective sheet 12, and the transparent protective sheet 12 is further protected. Is protected by the upper label sheet 11. Further, the upper layer side label sheet 11 is formed larger than the lower layer side transparent protective sheet 12, and when the label sheet 11 is affixed, the label sheet 11 is also provided on the front end surface of the mounting frame 7 including the periphery of the transparent protective sheet 12. 11 is affixed. At this time, an annular surface corresponding to the thickness t of the transparent protective sheet 12 is provided on the inner peripheral surface of the opening 7a to which the glass 6 is attached so that the transparent protective sheet 12 and the front end surface of the mounting frame 7 are continuous. The step portion 13 is formed, and the glass 6 is fitted to the opening portion 7a so that the bottom portion of the step portion 13 and the surface of the glass 6 are flush with each other. Thereby, when the surface of the glass 6 and the bottom part of the level | step-difference part 13 continue as a substantially identical plane and the transparent protective sheet 12 is affixed on the bottom part of the glass 6 and the level | step-difference part 13, the surface of the transparent protective sheet 12 and an attachment frame The top surface of the body 7 is flush with the front surface of the body 7, and the upper-layer label sheet 11 has no difference in level at the boundary between the transparent protection sheet 12 and the mounting frame 7, and It is affixed flat so as to straddle the surface and the front end surface of the mounting frame 7.

  The adhesive layer of the upper label sheet 11 is set to a peelable adhesive force. If the label sheet 11 is damaged or soiled, it can be easily replaced by removing the label sheet 11 and applying a new label sheet 11. It is also possible to configure so as to be able to. Thereby, the label sheet 11 which protects the glass 6 can always be kept in a clear state. At this time, a stronger adhesive can be used for the adhesive layer of the lower transparent protective sheet 12.

  As described above, in the best embodiment of the present invention, by protecting the glass 6 with the two-layer label sheet 11 and the transparent protective sheet 12, the thickness of the transparent protective material 10 itself is increased and the resistance to the glass 6 is improved. Impact properties can be increased. Furthermore, the transparent protective sheet 12 on the lower layer side is affixed to the surface of the glass 6 in a state where the transparent protective sheet 12 is not exposed directly to the outside but is accommodated in the stepped portion 13 formed on the inner peripheral surface of the mounting frame 7. 4 (a), even if an external force F is applied to the tip portion of the mounting frame 7 (the outer peripheral edge of the opening 7a), the external force F acts directly on the transparent protective sheet 12 on the lower layer side. There is no. That is, the region A (shown in FIG. 4B) from the outer periphery of the stepped portion 13 to the outer peripheral edge of the mounting frame 7 becomes a buffer region, and the transparent protective sheet 12 that directly protects the glass 6 is peeled off by the external force F. There is no. For this reason, even if the peripheral edge of the upper layer side label sheet 11 is peeled off by the external force F, the transparent protective sheet 12 can be kept attached to the surface of the glass 6, and the resistance of the transparent protective sheet 12 that directly protects the glass 6. By improving the peelability, the glass 6 can be stably protected over a long period of time. Further, the label sheet 11 can prevent damage and dirt of the transparent protective sheet 12, and the label sheet 11 directly exposed to the outside can be easily replaced when it is damaged or dirty. Can keep good.

Although the best embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention.
That is, in the above-described embodiment of the present invention, the case where the sight glass is used for observing the refrigerant in the refrigeration cycle or detecting the moisture present in the refrigerant is exemplified, but it goes without saying that the present invention is applicable to any fluid circuit. .
Moreover, although the example which used glass as a transparent member was shown, the transparent material etc. should just be a transparent material which can confirm the passage fluid and the moisture indicator 3 in summary.
Furthermore, the attachment structure of the moisture indicator 3 and the basic configuration of the sight glass 1 are not limited to the above-described embodiments, and can be applied to various types.
Furthermore, in the present invention, the moisture indicator does not necessarily have to be provided, and it is naturally possible to only observe the fluid passing through the sight glass.

1 Sight Glass 2 Main Body 2a Inlet 2b Outlet 2d Channel 3 Moisture Indicator 6 Glass (Transparent Member)
7 Mounting frame 7a Opening 10 Transparent protective material 11 Label sheet (upper sheet)
12 Transparent protective sheet (lower layer sheet)
13 Stepped portion 15 Comparison display portion C Refrigerant

Claims (5)

A main body having a fluid inlet and outlet and forming the fluid flow path therein;
A mounting frame provided with a viewing window for observing the fluid passing through the flow path;
A transparent member that seals the opening of the viewing window;
A transparent protective material pasted on the surface of the transparent member,
The transparent protective material is composed of a transparent lower layer sheet that is attached to the surface of the transparent member, and a transparent upper layer sheet that is attached to the lower layer sheet.
The sight glass, wherein the upper layer sheet is attached so as to cover the surface of the lower layer sheet including the outer peripheral edge of the opening.   The sight glass according to claim 1, wherein the lower layer sheet is larger than the transparent member, and the upper layer sheet is larger than the lower layer sheet.   An annular step portion having a depth corresponding to the thickness t of the lower layer sheet is formed on the inner peripheral edge of the mounting frame, and the annular step portion is substantially the same as the outer diameter of the lower layer sheet, and the bottom portion of the step portion and the transparent member The transparent member is fitted to the inner peripheral surface of the opening so that the upper surface of the opening is substantially flush with the upper surface, and the lower layer sheet is pasted so as to straddle the transparent member and the stepped portion, and The sight glass according to claim 1 or 2, wherein the upper layer sheet is pasted so as to straddle the lower layer sheet and the outer surface of the opening of the mounting frame.   The sight glass according to any one of claims 1 to 3, wherein the upper layer sheet is replaceable. A moisture indicator for detecting the moisture content of the fluid passing through the flow path;
The sight glass according to any one of claims 1 to 4, wherein a comparison display unit for determining the amount of moisture detected by the moisture indicator is formed on an outer peripheral side of the upper layer sheet. .

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