MXPA99010337A - Emerging temperature indicator for use in a type 3-cd air compressor or similar device - Google Patents

Abstract

The present invention relates to a temperature indicator to indicate when a specified temperature has been exceeded in a flow of a fluid through a conduit, this conduit has an opening, the opening includes a rigid engageable portion, and the temperature indicator it can be mounted rigidly in this opening and coupled thereto, in such a way that the temperature indicator projects through said opening and into the fluid flow in the conduit, the temperature indicator is characterized in that it comprises: a housing; It substantially encloses an internal chamber, the housing having a bore that extends from the internal chamber to an external surface of the housing, an indicating member located at least partially within the internal chamber, the indicating member extends from the internal chamber and in the hole, a pusher element located inside the inner chamber and exerting a pushing force between the housing and the indicator member and urging the indicator member toward the bore and a bonding agent that forms a joint between the indicator member and the housing to thereby restrict the movement of the indicator member toward the borehole under the action of the pusher member, and a engageable portion capable of rigidly coupling with the rigid engageable portion of the opening so that the temperature indicator projects through the opening and into the fluid flow when the engageable portion of the temperature indicator is rigidly engages with the rigid engagable portion of the conduit, the adhesion agent is thermosensitive to practically free the joint between the indicator member and the housing when the temperature of the adhesion agent practically reaches the specified temperature, and the adhesion agent is placed on the indicator of temperature so that the adhesion agent is placed practically in direct contact with the fluid flow in the conduit when the coupling portion of the temperature indicator is rigidly coupled with the rigid engageable portion of the opening so that the temperature indicator projects through the opening and into the flow of fluid in the conduc

Description

EMERGING TEMPERATURE INDICATOR FOR USE ON A TYPE 3-CD AIR COMPRESSOR OR SIMILAR DEVICE CROSS REFERENCE WITH RELATED REQUESTS This application is related to a subject similar to the one disclosed in the Application for United States Patent Serial No., presented contemporaneously with this by Brian L.. Cunkelman and Jennifer Ray and entitled "Temperature Indicator for Use in a Pressurized Envi- ronment", and with the Patent Application of the United States Serial No., also presented contemporaneously with the present and entitled "Temperature Activated Fun Valve". Both of the aforementioned applications are assigned to the assignee of the present application and herein expressly incorporated herein by reference thereto.

FIELD OF THE INVENTION The present invention relates, in general, to a temperature indicator to provide a visual indication of whether a fluid (i.e., a gas or a liquid) has exceeded the specified design temperature and, more particularly, is invention is related to a temperature indicator P11 5 / 99MX which is adapted to be mounted in an aperture provided in a conduit that transports fluid and, even more particularly, the present invention relates to a temperature indicator to indicate whether the compressed air flowing in a conduit An air compressor of the two-stage type has exceeded the specified design temperature.

BACKGROUND OF THE INVENTION It is noted that the temperature indicator of the invention has particular application in the field of air compressors and, more particularly, with two-stage type air compressors that incorporate or utilize a heat exchange system. intermediate or intercooler system for cooling the already compressed air leaving the first low compression stage and before entering the second high compression stage. Even more particularly, and observes that the temperature indicator of the invention has application in an intercooler system controlled by thermostat incorporated in an air compressor of the type of two stages or used by it, where in order to avoid the excessive formation of condensed in the intercooler, at least a portion of the air leaving the first low compression stage is passed through the intermediate heat exchange apparatus or P1145 / 99MX intercooler and then mixes with the rest of the air that is diverted to the intercooler to reach a predetermined inlet temperature towards the second high compression stage.

OBJECTS OF THE INVENTION An object of the present invention is the provision of a temperature indicator that provides an easily observable visual indication of whether a fluid contained in a container or reservoir or flowing through a conduit has exceeded, at any time, a specified temperature. Another object of the present invention is the provision of a temperature indicator that is reliable during operation, of rather simple design and, therefore, of relatively inexpensive manufacture. Another object of the present invention is the provision of said temperature indicator that can be used to monitor air communication in a conduit of an air compressor, particularly, a two-stage air compressor having an intercooler mechanism supplied between an air compressor. first cylinder of low pressure and a second cylinder of high pressure of the same and, in even more particular form, a compressor of air of two stages, P1145 / 99MX where the derivation of the intercooler mechanism is controlled by thermostat. In addition to the objects and advantages of the present invention described above, various other objects and advantages of the invention will be more readily apparent to those skilled in the relevant art from the following more detailed description of the invention, particularly, when this description be considered together with the Figures of the attached drawings and together with the appended claims.

SUMMARY OF THE INVENTION In one aspect, the invention generally presents a temperature indicator to indicate the time when a specified temperature has been exceeded in the flow of a fluid through a conduit, the conduit has an opening and the indicator of temperature can be mounted in this opening and coupled thereto, in such a way that the temperature indicator is projected through said opening and into the fluid flow in the conduit. The temperature indicator includes a housing that substantially encloses an internal chamber and has a bore that extends from the internal chamber to an external surface of the housing. An indicator member is located, at P1145 / 99MX less in part, inside the internal chamber and extending towards the hole. A pusher member is located within the inner chamber and exerts a thrust force between the housing and the indicator member and pushes the indicator member toward the borehole and a bonding agent that forms a bond between the indicator member and the housing for thus restricting the movement of the indicator member towards the borehole under the action of the pusher element. The bonding or adhesion agent is thermosensitive to substantially release the bond between the indicator member and the housing when the temperature of the adhesion agent reaches practically the specified temperature. In another aspect, the invention features a temperature indicator to indicate when a specified temperature in a fluid flow has been exceeded through a conduit of a two-stage air compressor. The air compressor includes at least one low pressure cylinder for receiving the air at ambient atmospheric pressure and for compressing said air at a first elevated pressure. The air compressor also has a high pressure cylinder for receiving the air at the first elevated pressure and for compressing the air which is at the first elevated pressure at a second elevated pressure, substantially higher than the first elevated pressure.

P1145 / 99MX and a duct to supply said air at the first elevated pressure to the high pressure cylinder. The temperature indicator is mounted on the duct in such a way that the temperature indicator projects through the duct and into the fluid flow in. the conduit. The temperature indicator includes a housing that virtually encloses an internal chamber, the housing has a bore that extends from the internal chamber towards an external surface of the housing and an indicator member located, at least partially, within the internal chamber and which it extends from the inner chamber and 'made the hole. A pusher member is located within the inner chamber and exerts a pushing force between the housing and the indicator member to push the indicating member toward the bore. An adhesion agent forms a joint between the indicator member and the housing to thereby restrict the movement of the indicator member towards the borehole under the action of the pusher element. The adhesion agent is thermosensitive to substantially release the bond between the indicator member and the housing when the temperature of the adhesion agent reaches practically the specified temperature. In a further aspect, the invention generally has an indicator unit for P1145 / 99MX temperature to indicate when a specified temperature has been exceeded in a flow of a fluid through a conduit. The conduit has an opening and the temperature indicating unit can be mounted in the opening and coupled thereto such that the temperature indicating unit projects through said opening and into the fluid flow in the conduit. The temperature indicating unit includes a cartridge holder for coupling with the opening in the channel. The cartridge holder includes a concavity formed therein and a hole that extends from the concavity towards an external surface of the cartridge holder. A cartridge is provided for connection to the cartridge holder. The cartridge includes a base member, a cylindrical portion extending outwardly from the base member and an indicator member having a piston portion and a portion of the rod extending outwardly from the piston portion. The piston portion of the indicator member and the cylinder portion of the cartridge are slidably coupled for coaxial movement therebetween. A pusher member is located between the piston portion and the base member and urges the piston portion outwardly from the base member. An adhesion agent forms a bond between the indicator member and the cylinder portion to thereby restrict movement P1145 / 99MX of the indicator member away from the base member under the action of the pusher element. The bonding agent is thermosensitive to practically free the bond between the indicator member and the cylinder portion when the temperature of the adhesion agent practically reaches the specified temperature. The temperature indicator further includes a mechanism for releasably connecting the cartridge to the cartridge holder to thereby form an assembled structure and the rod portion of the indicator member extends into the borehole of the assembled structure. The present invention will now be described by a particular preferred embodiment, reference being made to the accompanying drawings, wherein: BRIEF DESCRIPTION OF THE DRAWINGS OR FIGURES Figure 1 is an elevation view in cross section through a pop-up temperature indicator constructed in accordance with the invention and representing a first configuration of the temperature indicator before it is exposed to a fluid that exceeds a specified design temperature. Figure 2 is a sectional elevation view. cross-section of the emerging indicator of P1145 / 99MX temperature of Figure 1, which shows the temperature indicator in a second configuration after it has been exposed to a fluid that exceeds the specified design temperature. Figure 3 is an elevation view in cross section of a cartridge component of the temperature indicator of the invention. * Figure 4 is an elevation view in cross section of a cartridge holder component of the temperature indicator of the invention. Figure 5 is a cross-section elevation view of the temperature indicator of the invention mounted in a conduit that transports the flow of a fluid, the temperature indicator is in the first configuration not exposed. Figure 6 is an elevation view in cross section of the temperature indicator of the invention, mounted on the conduit that transports the flow of the fluid, the temperature indicator is in the second exposed configuration and Figure 7 is a perspective view of the a two-stage air-cooled air compressor unit, showing the assembly of the temperature indicator of the invention in a duct therein with the purpose of monitoring the temperature of the air flow through the duct.

P1145 / 99MX DETAILED DESCRIPTION OF THE PREFERRED MODE Before proceeding to the more detailed description of the invention, it should be noted that the identical components having identical functions have been identified with identical reference numbers for reasons of clarity and understanding of the invention. Referring initially, more particularly, to Figures 1 and 2, a pop-up temperature indicator, generally designated 10 and constructed in accordance with the present invention, generally includes a housing, generally designated 12, that encloses practically inside it to the inner chamber 14. A hole 16 extends through the wall of the housing 12 from the inner chamber 14 towards an outer surface 18 of the housing 12. The housing 12 preferably has a two-piece construction and includes a first housing member 20 and a second housing member 22, which are preferably coupled by means of the supply of threaded coupling portions 24 provided therein. The coupling of the first and second housing members 20 and 22, respectively, by means of the threaded portions 24, in general encloses the inner chamber 1 practically.

P1145 / 99MX An indicating member, generally designated 26, is positioned substantially within the inner chamber 14 and includes a portion of rod 28 extending outward from a piston member 34 and toward the bore 16. A pusher element 30 it is located within the inner chamber 14 and caged between the piston member 26 and the second housing member 12. The pusher member 30 exerts a pushing force that urges the indicator member 26 toward the hole 16 and, therefore, the rod portion 28 further towards the bore 16. Preferably, the pusher member 30 is provided in the form of a coil spring or spring, as shown. Of course other well-known pushing elements can be used, for example, diaphragm springs, etc. An adhesion agent 32 is placed adjacent and in an adhesion coupling with both the indicator member 26 and the housing 12 (more particularly, with the second housing member). 22) to join them and thereby restrict the movement of the indicator member 26 to the borehole 16. The adhesion agent 32 can be deposited in the form of a fillet surrounding the indicator member 26, as shown. The adhesion agent 32 is a "heat sensitive" adhesion agent, in the sense that its P1145 / 99MX adhesion strength is significantly reduced as it reaches or reaches the specified design temperature, with the result that the indicator member 26 is practically released to move towards the bore 16 under the action of the pusher element 30. Preferably, the Adhesion agent 32 is from the family of thermosensitive adhesion agents of which, for example, the Indian (In) is a member. However, those of ordinary skill in the art will recognize that other thermosensitive adhesion agents may be used instead. Preferably, the adhesion agent includes Indium (In) and, even more preferably, the adhesion agent is an Indium (In) alloy. Indium (In) alloys are available, which melt and, therefore, reduce their adhesion strength, when they reach the various specified temperatures. One of the various sources of Indium (In) alloys is the Indium Corporation of America®, Preferably, as shown in Figure 1, the portion of shank 28 is dimensioned in such a way that, in the first configuration wherein the element Pusher 30 is compressed, the distal end of the shank portion 28 is substantially flush with the outer surface 18 of the first P1145 / 99MX housing member 20. Referring more particularly below to Figure 2, in the second configuration, where the temperature indicator 10 has been exposed to a temperature exceeding the design temperature specified, the adhesion element 32 ( Figure 1) has released the union of the indicator member 26 with the housing 12, with the result that the rod portion 28 projects beyond the outer surface 18. In the currently preferred particular mode, shown in Figures 1-6 , the indicator member 26 includes a piston portion 34 that slidably engages the cylinder portion 36 provided in the housing 12 to allow coaxial movement therebetween. Preferably, the cylinder portion 36 is in the form of a recess 38 provided in the second housing member 22. More preferably, this second housing member 22 includes a base member 40 from which a first structure 42 extends outwardly with rate or cup shape for forming the recess 38 in the second housing member 22. Further, the piston portion 34 of the indicator member 26 is provided as a second structure 44 in the form of a cup or cup. As can be seen in Figures 1 and 2, the supply of the first and second structures P1145 / 99MX second cup-shaped 42 and 44, respectively, forms a particularly good structure for enclosing or containing a helical spring as the pusher element 30 between them. In order to allow the adhesion element 32 to be easily exposed to the flow of fluid within the conduit, where the temperature indicator 10 is mounted and positioned, the housing 12 is provided with at least one, and preferably two or more, ports 46, these ports 46 preferably take the form of openings formed in the first housing member 20. The housing 12 is provided with a mounting mechanism to allow assembly of the temperature indicator 10 in the conduit containing the fluid flow. , preferably provided as an external thread portion 48 in the first housing member 20. To prevent the flow of the conduit from escaping through the internal chamber 14, a fluid-tight seal 50, preferably in the form of a surround, surrounds the rod portion 28 and is preferably positioned within a groove 52 provided in the wall of the hole 16. Figures 3 and 4 illustrate an aspect of the invention. tion, wherein the temperature indicator 10 of the invention is configured as a two-piece construction, which includes a cartridge, which can be P1145 / 99MX replaced by a new cartridge after exposure to a fluid flow that has a temperature that exceeds the specified design temperature and a cartridge holder to accept the cartridge. Thus, in Figures 3 and 4, by reference number 54, a replaceable cartridge is generally designated in accordance with this aspect of the invention, while the cartridge holder adapted to receive the cartridge 54 is generally designated by the reference number 56. The rest of the structural elements shown in Figures 3 and 4 correspond practically to those shown and designated in Figures 1 and 2, using like reference numbers. As indicated above, the temperature indicator 10 is particularly adapted for mounting in an aperture provided in a wall of the conduit containing therein the fluid flow. The mounting of the temperature indicator 10 on a conduit wall is illustrated more particularly in Figures 5 and 6, where a wall 58 of the conduit enclosing the flow of the fluid 60 is provided with a conduit opening 62, sized to receive and engage with the temperature indicator 10. To this end, the opening 62 of the conduit is provided with threads or cords 64 which are P1145 / 99MX attach to the mounting mechanism (e.g., to the threaded portion) 48 of the first housing member 20. When positioned in this manner, the adhesion agent 32 is exposed to fluid flow 60 through the ports 46 and the outer surface 18 of the first housing member 20 is positioned as an exposed surface 66, i.e., exterior to the wall 58 of the conduit. The temperature indicator 10 is provided with a torque transmitting portion to allow the temperature indicator 10 to be threaded or screwed into the cords 64 of the opening 62. Preferably, the torque transmitting portion adopts the shape of a hexagonal screw head 57 formed in the first housing portion 20, although it is clear that it can be replaced by other torque transmitting structures (eg, a screwdriver slot, etc.). The mounting of the temperature indicator 10 of the invention in the wall 58 of the conduit does not appreciably restrict the flow of fluid through the conduit, since the fluid is free to flow around the temperature indicator 10 and, additionally, since the fluid can flow through the temperature indicator 10 by itself through the ports 46 and an annular space 59 formed between the P1145 / 99MX indicator member 26 and the second housing member 22. In a preferred embodiment, the fluid flow 60 is a gas flow and, in a particularly preferred embodiment, the fluid flow 60 is an air flow through the conduit. In this particularly preferred embodiment, the temperature indicator 10 can be used to monitor the temperature of the air passing through a conduit of a two-stage air-compressing unit having at least one integral intercooler. The assignee of the present patent application manufactures the air compressor unit and is referred to in the rail transportation industry as a "3-CD" Type Air Compressor, manufactured by the estinghouse Air Brake Company. This "3-CD" type Air Compressor unit is illustrated in Figure 7 and is further described in U.S. Patent No. 5,106,270, issued to Goettel et al., On April 21, 1992 and in the publication entitled "Instructions for Disassembly, Repair and Assembly of '3-CD' Air Compressors", with rights reserved from 1994 by the Westinghouse Air Brake Company, both this publication and the United States Patent No. 5,106,270, are expressly incorporated here as a reference, with the same result as if its content was P114S / 99MX fully expose here. As shown in Figure 7, a "3-CD" Type Air Compressor Unit 70 generally includes a pair of first stage or low pressure air compression cylinders or stages 72 and 74, which admit ambient air filtered at ambient atmospheric pressure and they compress this air at a first high pressure. The air compressor unit 70 also includes a high pressure or second stage air compression cylinder 76. As a result of the first compression step, air leaves the low pressure cylinders 72 and 74 at an elevated temperature. Instead of introducing the air exiting the low pressure compression cylinders 72 and 74 directly into the high pressure cylinder 76, it has been found that a more efficient compression is obtained by cooling the air between the first and second compression stages. . For this purpose, the air compressor unit 70 is provided with a pair of intermediate heat exchange elements or intercoolers 78 and 80, which receive the air exiting the low pressure cylinders 72 and 74, respectively, and cool this air before its introduction to the high pressure cylinder 76. The cooled air exiting from the intercoolers 78 and 80 is then introduced into a common conduit 82 and is P1145 / 99MX transported through this conduit to the elevated compression cylinder 76. The air compressor unit 70 is energized by means of an input crankshaft 84, whose torque can be supplied by various mechanical linkages (eg, belts and pulleys). ) through the power plant of the locomotive. However, it is becoming more common for the torque to be supplied to the crankshaft 84 by so-called direct drive motors and to activate only the air compressor unit 70 and, therefore, the drive motor, when required , that is, "on demand". Thus, it is common for the air compressor unit 70 to be operated in a pattern or repeated start / stop cycle. In this cycle, after a starting phase, the air can be cooled so that when leaving the intercoolers 78 and 80, an excess of condensation can form, since the air at the interstage pressure is not at a sufficiently high temperature for retain all its moisture in the vapor phase. The formation of this condensation in the intercoolers 78 and 80 can have deleterious results, for example, by leaking beyond the rings of the cylinder in the second stage of high pressure and towards the lubricant of the crankcase. In accordance with the above, it has P1145 / 99MX found desirable, particularly in the case where the air compressor unit 70 is operated in the form of starts / stops, providing a thermostatically controlled system to route at least a certain portion of the air flow, so that it is derived to the intercoolers 78 and 80 for a certain period of time after starting until the air exiting the low pressure cylinders 72 and 74 has reached a certain minimum temperature, whereupon the intercoolers 78 and 80 are then reintroduced to the flow path in order to provide an almost constant inter-cooler discharge temperature. One of these systems for thermostatically controlling the air flow through the intercoolers 78 and 80 which is used by the transferee of the present invention together with its "3-CD" compressors, is generally referred to as an "Intercooler System". Controlled by Thermostat "or" TCIS ". The temperature indicator 10 of the present invention finds a particularly referenced application when used in conjunction with a "3-CD" Type Air Compressor and, an even more particularly preferred application, when the "3-CD Type Air Compressor" is used. "is equipped with a" Thermostat Controlled Intercooler System "(ie, P1145 / 99MX a "TCIS") that controls the air flow through the intercoolers 78 and 80 depending on their temperature. In accordance with the above, in Figure 7, the reference number 86 indicates the currently preferred location for mounting the temperature indicator 10 of the invention. This location 86 is in a common high pressure intake manifold 82 of a "3-CD" Type Air Compressor. When mounted in this location 86, the temperature indicator 10 of the present invention provides a readily determinable and easily viewable indication of whether the temperature of the air flowing in the common high pressure intake manifold 82 has at some point exceeded the temperature of specified design and, thus, provides a good indication of whether the temperature controlled intercooler system ("TCIS") of the "3-CD" type air compressor unit 70 has malfunctioned, indicating the need of additional investigation and its possible repair, for example, examination and / or replacement of the thermostat. While the present invention has been described * by means of the detailed description of a particularly preferred embodiment, it will be readily apparent to those of ordinary skill in the art that various substitutions may be made.

P1145 / 99MX or equivalents without deviating from the spirit or scope of the invention as set forth in the appended claims.

P1145 / 99MX

Claims (20)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following EIVINDICATIONS is claimed as property; 1. A temperature indicator to indicate when a specified temperature has been exceeded in a flow of a fluid through a conduit, this conduit has an aperture and the temperature indicator can be mounted in this aperture and attached to it, as such In such a way that the temperature indicator is projected through said opening and into the fluid flow in the conduit, the temperature indicator comprises: a housing; the housing contains practically an internal chamber; the housing has a bore that extends from the internal chamber to an external surface of the housing; • an indicator member located, at least partially, inside the internal chamber; the indicator member extends from the internal chamber and in the hole; a pusher element located inside the inner chamber and exerting a pushing force between the housing and the indicator member and that P1145 / 99MX pushes the indicator member toward the borehole and a bonding agent that forms a joint between the indicator member and the housing to thereby restrict the movement of the indicator member toward the borehole under the action of the pushing member; the adhesion agent is thermosensitive to practically free the union between the indicator member and the housing when the temperature of the adhesion agent reaches practically the specified temperature. A temperature indicator according to claim 1, wherein the indicator member includes a piston portion and a rod portion, the rod portion extends into the bore, the housing includes a cylinder portion, the cylinder portion of the indicator member and the cylinder portion of the housing are slidably coupled for substantially coaxial movement therebetween and, the pusher member is located substantially between the piston portion of the indicator member and the cylinder portion of the housing. 3. A temperature indicator according to claim 1, wherein the housing is provided with at least one port to provide fluid communication from the outside of the P1145 / 99MX housing to the inner chamber, when the temperature indicator is mounted in the opening and projects through it to the fluid flow. 4. A temperature indicator according to claim 2, wherein the housing includes: a first housing member that can be mounted and coupled to the conduit opening and a second separate and distinct housing member that can be connected to the first housing member; accommodation; and, wherein the cylinder portion of the housing includes a recess provided in the second housing member. 5. A temperature indicator according to claim 4, wherein the bonding agent is located adjacent to both the piston portion and the cylinder portion, thereby attaching the piston portion and portion of the piston portion. cylinder. 6. A temperature indicator according to claim 4, wherein the second housing member includes a base member and a first cup-shaped structure extending outwardly from the base member and contiguous thereto and the portion thereof. of cylinder includes the first cup-shaped structure, and wherein the portion of P1145 / 99MX piston includes a second cup-shaped structure that extends outwardly from the rod portion of the indicator member and contiguously thereto, the piston portion includes the second cup-shaped structure, and wherein the element The pusher is located at least partially within the first and second cup-shaped structures and exerts a pushing force between them. 7. A temperature indicator, according to claim 1, wherein the housing has an exposed surface when the temperature indicator is mounted in the opening of the conduit and the temperature indicator projects through said opening and into the fluid flow, and wherein the indicator of temperature has at least two configurations: the first configuration indicates the non-exposure of the adhesion agent to the fluid exceeding the specified temperature, the rod portion of the indicator member extends beyond the exposed surface of the housing a first distance in the First configuration and a second configuration indicating exposure of the adhesion agent to the fluid exceeding the specified temperature, the shank portion of the indicator member extends beyond the exposed surface of the housing a second P1145 / 99MX distance in the second configuration, the second distance is practically larger than the first distance. 8. A temperature indicator according to claim 7, wherein the first distance is practically zero. 9. A temperature indicator according to claim 1, wherein the adhesion agent comprises at least one of Indium and an Indian alloy and the pusher element comprises a coil spring. A temperature indicator according to claim 1, wherein the temperature indicator further includes: a mounting means for removably mounting the temperature indicator in the opening, such that the temperature indicating member is projected to through said opening and towards the flow of the fluid; and a connecting means or connection for releasably connecting the second housing member with the first housing member. .eleven. A temperature indicator according to claim 1, wherein the temperature indicator further includes a fluid-tight seal surrounding the rod portion of the indicator member and which is located within the borehole. P1145 / 99MX 12. A temperature indicator to indicate at which point a specified temperature has been exceeded in a flow of a fluid through a conduit of a two-stage air compressor, wherein the air compressor includes at least one low pressure cylinder for receiving air at atmospheric atmospheric pressure and for compressing said air at a first elevated pressure, and a high pressure cylinder for receiving the air at the first elevated pressure and for compressing the air that is at the first elevated pressure at a second substantially elevated pressure higher than the first elevated pressure and a duct for supplying air at the first elevated pressure to the high pressure cylinder, a temperature indicator is mounted in the duct, such that the temperature indicator projects through the duct and towards the flow of fluid in the conduit, the temperature indicator comprises: a housing, the housing substantially encloses a inner chamber and the housing has a bore that extends from the internal chamber towards an external surface of the housing; an indicator member located, at least partially, within the internal chamber of the housing, the indicating member extends from the internal chamber and towards the bore; P1145 / 99MX a pusher element located inside the i. inner chamber and that exerts a pushing force between the housing and the indicator member and pushes the indicator member toward the hole and an adhesion agent that forms a joint • between the indicator member and the housing to thereby restrict the movement of the indicator member towards the borehole under the action of the pusher element, the adhesion agent is thermosensitive to practically release the connection between the indicator member and the housing when the temperature of the indicator Adhesion agent reaches practically at the specified temperature. A temperature indicator according to claim 12, wherein the indicating member includes a piston portion and a portion of the rod extending into the bore and the housing includes a cylinder portion, the piston portion of the indicator member and the cylinder portion of the housing are slidably coupled for substantially coaxial movement therebetween, the pusher member being located substantially between the piston portion of the indicator member and the cylinder portion of the housing and the housing is provided with at least one port to provide communication of the fluid flow in the conduit from the outside of the housing with the inner chamber. P1145 / 99MX 14. A temperature indicator according to claim 13, wherein the housing includes a first housing member and a second separate and distinct housing member that can be connected to the first housing member and the cylinder portion of the housing includes a recess provided in the housing. second housing member and the adhesion agent is located adjacent to both the piston portion and the cylinder portion to attach or adhere in this manner to the piston portion and the cylinder portion, and the second housing member includes a base member and a first cup-shaped structure that extends outwardly from the base member and formed contiguous thereto, the cylinder portion includes a first cup-shaped structure and portion thereof. The piston includes a second cup-shaped structure that extends from the rod portion of the indicator member and is contiguous with it, the piston portion includes the second cup-shaped structure and the pusher member is at least partially located within the piston portion. the first and second cup-shaped structures and exerts between them an e punch force. 15. A temperature indicator according to claim 12, wherein the adhesion agent includes at least one of either, Indian or an alloy P1145 / 99MX from Indio and the housing has an exposed surface visible from the outside of the conduit and the temperature indicator has at least two configurations, a first configuration indicating the non-exposure of the adhesion agent to the fluid exceeding the specified temperature, the portion of the indicator member extends beyond the exposed surface of the housing a first distance in the first configuration and a second configuration indicating the exposure of the adhesion agent to the fluid exceeding the specified temperature, the portion of the indicator member shank * extends beyond the exposed surface of the housing a second distance in the second configuration, the second distance is substantially greater than the first distance and the pusher element is a helical spring and the temperature indicator additionally includes a connecting means for connecting in removable form to the second member of housing with the first housing member and a fluid tight seal surrounding the rod portion of the indicator member located within the borehole. 16. A temperature indicating unit to indicate at which point a specified temperature has been exceeded in a fluid flow through a conduit, said conduit has a P1145 / 99MX opening and the temperature indicating unit can be mounted in the opening and attached to it, so that the temperature indicating unit projects through the opening and into the fluid flow of the duct, the indicator unit The temperature comprises: a cartridge holder for coupling with the opening in the channel, the cartridge holder has a concavity formed therein; a hole that extends from the concavity towards an external surface of the cartridge holder; a cartridge to connect to the cartridge holder, the cartridge includes; a base member, a cylinder portion extending outwardly from the base member, an indicator member, the indicator member includes a piston portion and a portion of the rod extending outward from the piston portion, the piston portion of the indicator member and the portion of the cylinder are slidably coupled for coaxial movement therebetween; . a pusher element located between the piston portion and the base member and urging the piston portion away from the base member; an adhesion agent that forms a union P1145 / 99MX between the indicator member and the cylinder portion to thereby restrict the movement of the indicator member away from the base member under the action of the pusher member, the adhesion agent is thermosensitive to practically release the joint between the indicator member and the cylinder portion when the temperature of the adhesion agent reaches practically the specified temperature and the temperature indicator further includes a means for releasably connecting the cartridge to the cartridge holder to thereby form an assembled structure, the stem portion of the cartridge. Indicator member extends into the hole in the assembled structure. 17. A temperature indicating unit according to claim 16, wherein the cartridge holder is provided with at least one port for providing fluid communication from the outside of the cartridge holder with the adhesion agent when the temperature indicating unit is mounted on the aperture and projects therethrough to the fluid flow and the adhesion agent is located adjacent to both the piston portion and the cylinder portion to thereby attach to the piston portion and portion of the piston portion. cylinder. 18. A temperature indicating unit, according to claim 17, wherein the portion of P1145 / 99MX cylinder includes a first cup-shaped structure that extends outward from the base member and that is contiguous with it, the piston portion includes a second cup-shaped structure which extends outwardly from the rod portion and which is contiguous with it and the pusher element is located, at least partially, within the first and second structures in the shape of cup and exert between them a force of push. 19. A temperature indicating unit according to claim 18, wherein the cartridge holder has an exposed surface when the assembled structure of the temperature indicating unit is mounted in the opening of the conduit, such that the temperature indicating unit is projected through the opening and into the flow of the fluid and the temperature indicating unit has at least two configurations, a first configuration indicating no exposure of the adhesion agent to the fluid exceeding the specified temperature, the portion of the indicator member shank extends beyond the exposed surface of the cartridge carrier a first distance in the first configuration and a second configuration indicating the exposure of the adhesion agent to the fluid exceeding the specified temperature, the portion of the indicator member extends beyond the surface P1145 / 99MX exposed from the cartridge holder a second distance in the second configuration and the second distance is practically greater than the first distance. 20. A temperature indicating unit according to claim 19, wherein the adhesion agent includes at least one of Indium or an Indian alloy and the pusher element is a coil spring and the first distance is practically equal to zero and the unit The temperature indicator further includes a mounting means for removably mounting the temperature indicating unit in the opening, such that the temperature indicating unit member projects through the opening and into the fluid flow and a medium. connection for releasably connecting the second housing member with the first housing member and a fluid tight seal surrounding the shank portion of the indicator member located within the bore. P1145 / 99MX