US20130140417A1

US20130140417A1 - Thermal switch mounting clip

Info

Publication number: US20130140417A1
Application number: US13/309,935
Authority: US
Inventors: Alan Gerard Amore; Bryan Dague
Original assignee: Sensata Technologies Inc
Current assignee: Sensata Technologies Inc
Priority date: 2011-12-02
Filing date: 2011-12-02
Publication date: 2013-06-06

Abstract

Techniques disclosed herein include a mounting clip for use with large body thermal switches, which have can a length substantially longer than a diameter of refrigeration tubing. The mounting clip snaps onto the thermal switch, and then snaps or locks onto the refrigeration tubing as well. Embodiments can include a one-piece or two-piece mounting clip that removable presses and holds the thermal switch against a refrigeration tube by encompassing both the refrigeration tube and the thermal switch. The mounting clip can be sized small enough to fit within relatively small space constraints of evaporator units.

Description

BACKGROUND

The present disclosure relates to refrigeration systems, and particularly to thermostats or thermal switches of refrigeration systems.
Refrigeration systems include refrigerated bins and display cases. Such refrigerated display cases are common in convenience stores, grocery stores, and other commercial applications. For example, some display cases can include upright units with shelves to stock and display refrigerated food or frozen items.

SUMMARY

Such refrigeration systems for commercial display and storage can include an evaporator to chill surrounding air within a refrigeration unit. This evaporator typically includes refrigeration tubing, which can accumulate frost from prolonged use. To address the frost issue, a thermostat or thermal switch can be mounted to refrigeration tubing of the evaporator portion of the refrigeration system. This thermal switch then controls on-off cycles of a heater that removes or prevents frost from accumulating on the evaporator refrigeration tubing or coils.
Certain refrigeration systems can include a generally elongated evaporator unit having refrigeration tubing that runs back and forth within a length of the evaporator unit. The refrigeration tubing has U-bends (also known as return bends) at the ends of the evaporator unit. In other words, the refrigeration tubing coil runs within the evaporator space, looping back and forth into and out of the unit multiple times. Thus, there are several evaporator tube U-bends at the end of the evaporator unit. These U-bends are in relatively close proximity to each other, that is, they are tightly bended and bunched leaving little free space.
Space constraints of the evaporator create challenges both during manufacture of refrigeration systems, and for maintenance—especially when the evaporator unit is positioned tightly within the larger refrigeration system to minimize space used by components used in the refrigeration cycle. Specifically, such evaporator units have significant size constraints on the ends for adding a thermal switch. Adding the thermal switch to the end of an evaporator unit is preferred for subsequent access such as for replacement, as well as initial assembly. In addition to the relatively small space available for the thermal switch, this thermal switch needs to be ergonomically accessible both for assembly and for replacement. For example, in some refrigeration units, it is necessary to install the thermal switch using one hand.
Techniques disclosed herein include a mounting clip for use with so called large body thermal switches, which have a length substantially longer than a diameter of refrigeration tubing. Such thermal switches typically include one end having a semi-cylindrical surface area designed to contact and follow the shape of refrigeration tubing, thereby increasing surface area contact between the thermal switch and refrigeration tubing. As such, there are significant physical constraints for the clip both from the thermal switch size and the closely spaced U-bends.
One embodiment includes a mounting clip that provides an easy way to attach the thermal switch to the refrigeration tubing. For example, one embodiment includes a snap-fit design. The mounting clip snaps onto the thermal switch, and then snaps onto the refrigeration tubing as well. The mounting clip can be further sized to meet the space constraints defined by the evaporator unit end section. The mounting clip can be attached and removed with one hand, secures contact between the thermal switch and the refrigeration tube, and fits within the bounds of clustered return ends of refrigeration tubing.
Additionally, although each of the different features, techniques, configurations, etc., herein may be discussed in different places of this disclosure, it is intended that each of the concepts can be executed independently of each other or in combination with each other. Accordingly, the one or more present inventions, embodiments, etc., as described herein can be embodied and viewed in many different ways.
Also, note that this preliminary discussion of embodiments herein does not specify every embodiment and/or incrementally novel aspect of the present disclosure or claimed invention(s). Instead, this brief description only presents general embodiments and corresponding points of novelty over conventional techniques. For additional details and/or possible perspectives (permutations) of the invention(s), the reader is directed to the Detailed Description section and corresponding figures of the present disclosure as further discussed below.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, features, and advantages of the invention will be apparent from the following more particular description of preferred embodiments herein, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, with emphasis instead being placed upon illustrating the embodiments, principles, concepts, etc.

FIG. 1 is a perspective view of a thermal switch mounting clip according to embodiments herein.

FIG. 2 is a front view of a thermal switch mounting clip according to embodiments herein.

FIG. 3 is a top view of a thermal switch mounting clip according to embodiments herein.

FIG. 4 is a side view of a thermal switch mounting clip according to embodiments herein.

FIG. 5 is a perspective view of a thermal switch mounting clip securing a thermal switch to refrigeration tubing according to embodiments herein.

FIG. 6 is a front view of a thermal switch mounting clip securing a thermal switch to refrigeration tubing according to embodiments herein.

FIG. 7 is a perspective view of a thermal switch mounting clip according to embodiments herein.

FIG. 8 is a front view of a thermal switch mounting clip according to embodiments herein.

FIG. 9 is a top view of a thermal switch mounting clip according to embodiments herein.

FIG. 10 is a side view of a thermal switch mounting clip according to embodiments herein.

FIG. 11 is a perspective view of a thermal switch mounting clip securing a thermal switch to refrigeration tubing according to embodiments herein.

FIG. 12 is a front view of a thermal switch mounting clip securing a thermal switch to refrigeration tubing according to embodiments herein.

FIG. 13 is a side view of a thermal switch mounting clip securing a thermal switch to refrigeration tubing according to embodiments herein.

DETAILED DESCRIPTION

Techniques disclosed herein include a mounting clip for use with large body thermal switches, which can have a length substantially longer than a diameter of refrigeration tubing. Such thermal switches typically include one end having a concave semi-cylindrical surface area designed to contact and follow the shape of refrigeration tubing, thereby increasing surface area contact between the thermal switch and refrigeration tubing. As such, there are significant physical constraints for the clip both from the thermal switch size and the closely spaced U-bends.
In general, example embodiments can include a one-piece or two-piece mounting clip that removable presses and holds the thermal switch against a refrigeration tube by encompassing both the refrigeration tube and the thermal switch.
Referring now to FIGS. 1-6, one embodiment includes a thermal switch mounting clip 100 having an elongated member 110. The elongated member 110 (FIG. 1) includes a first end 111 and a second end 112. The elongated member 110 is bent at multiple points, which bending can be performed during the manufacturing process. The elongated member 110 is bent such that the elongated member 110 forms an approximately rectangular loop sized to pass around both a refrigeration tube 180 and a thermal switch 170 in contact with the refrigeration tube 180. The loop of mounting clip 100 is shown in FIGS. 1 and 2. The loop is shown with refrigeration tube 180 and thermal switch 170 in FIGS. 5 and 6.
In FIGS. 5 and 6, the thermal switch 170 has a substantially cylindrical body including a first end 171 and a second end 172. The first end 171 of the thermal switch is substantially flat, similar to the end of a cylinder. The second end 172 of the thermal switch 170 has a generally concave surface 174 shaped to conform to a portion of curvature of the refrigeration tube 180 for thermal contact between the thermal switch and the refrigeration tube, thereby increasing surface area contact. The thermal switch 170 controls defrost cycles of a refrigeration system. The thermal switch can be sized to conform to a U-bend or return bend of evaporator tubing. The thermal switch can include electrical wiring 176, 177, and 178 for signaling a corresponding heater to be switched on or off.
Referring now to FIG. 2, the loop defines a top portion 123, a bottom portion 124, a first side portion 121, and a second side portion 122. The first end 111 of the elongated member 110 and the second end 112 of the elongated member 110 are positioned at the first side 121 portion of the loop. In other words, the bending of the elongated member 110 is such that the ends terminate near each other on the first side 121 of the loop. The first end 111 of the elongated member 110 is configured to releasably interlock with the second end 112 of the elongated member 110 such that when interlocked, the elongated member 110 or mounting clip 100 presses the thermal switch 170 against the refrigeration tube 180 thereby securing thermal contact between the thermal switch 170 and the refrigeration tube 180. FIG. 6 illustrates the interlocking of the ends of the mounting clip 110, as well as showing the thermal switch 170 held against the refrigeration tube 180.
Note that top, bottom, and side portion labels are for distinction among/between parts of the mounting clip for clarity relative to each other but do not necessarily indicate orientation during use. During use of the mounting clip, such as when attached to an evaporation unit, the top portion of the loop may be oriented in a side (vertical) position relative to gravity, or otherwise oriented depending on a particular orientation of refrigeration tubing.
With the elongated member 110 formed from a material having some elastic or tensile properties (such as metal or plastic), the mounting clip 100 can be squeezed together or otherwise manipulated to separate the ends 111 and 112 such that the mounting clip is in an open position (not shown). In an open position, the mounting clip 100 can open or flex sufficiently to be passed over refrigeration tubing 180. After being passed over the refrigeration tubing 180, the ends 111 and 112 can be interlocked, the force of which secures the thermal switch 170 to the refrigeration tubing 180. Locking and interlocking the ends 111 and 112 can be performed either manually or using a locking/unlocking tool. In this example embodiment, the ends 111 and 112 are illustrated as having opposing bends adapted to form hooks that interlock with each other. Note that other latching mechanisms can be substituted for the elongated member to interlock with itself.
Returning to FIG. 1, the mounting clip 100 can include structural plate 130 attached to the top portion 123 of the loop. The structural plate 130 has multiple prongs (131, 132, 133, and 134) tensioned to releasably hold the thermal switch 170 within the loop of the elongated member 110. Note that by manufacturing the prongs using a metallic or plastic or equivalent material, the prongs can flex sufficiently to permit the second end 171 of the thermal switch to be pressed against the structure plate 130, and then hold the thermal switch 170 against the structural plate 130, and, by extension, hold the thermal switch 170 against or within the mounting clip 100. If the thermal switch 170 has a perimeter lip 173, then the prongs can flex sufficiently to pass over the lip 173, and then return towards an initial position and contact the cylindrical body of the thermal switch 170. In other words, the prongs enable the thermal switch to be walked on to the mounting clip (angled installation) or snapped on to the mounting clip. The structural plate can be spot welded, riveted, crimped, or otherwise attached to the elongated member. In other embodiments, the structural plate can be integral with the mounting clip, or have prongs that extend from the top portion 123 of the elongated member 110 without having a separate structural plate.
In some embodiments, a thickness of the elongated member and loop geometry can be selected such that the loop is sized to fit between U-bends of adjacent refrigeration tubing, such as bunched return bends on the end of an evaporator unit.
Referring now to FIGS. 7-13, another embodiment includes a thermal switch mounting clip 200 having an elongated member 210. The elongated member 210 (FIG. 7) includes a first end 211 and a second end 212. The elongated member 210 is bent at multiple points, which bending can be performed during the manufacturing process. The elongated member 210 is bent such that the elongated member 210 forms a loop sized to pass around both a refrigeration tube 180 and a thermal switch 170 in contact with the refrigeration tube 180. The loop can be approximately rectangular in shape. The loop of mounting clip 200 is shown in FIGS. 7 and 8. The loop is shown with refrigeration tube 180 and thermal switch 170 in FIGS. 11-13.
In FIGS. 11-13, the thermal switch 170 has a substantially cylindrical body including a first end 171 and a second end 172. The first end 171 of the thermal switch is substantially flat, similar to the end of a cylinder. The second end 172 of the thermal switch 170 has a generally concave surface 174 shaped to conform to a portion of curvature of the refrigeration tube 180 for thermal contact between the thermal switch and the refrigeration tube, that is, to increase surface area contact. The thermal switch 170 controls defrost cycles of a refrigeration system. The thermal switch can be sized to conform to a U-bend or return bend of evaporator tubing. The thermal switch can include electrical wiring 176, 177, and 178 for signaling a corresponding heater to be on or off.
Referring now to FIG. 8, the loop defines a top portion 223, a bottom portion 224, a first side portion 221, and a second side portion 222. The top portion of the loop having a thermal switch securing mechanism 230 that releasably holds the thermal switch 170 relative to the elongated member 210 using multiple spring tension prongs (231, 232, 233, and 234). The multiple spring tension prongs adapted to releasably hold the thermal switch 170 to the elongated member 210.
Note that by manufacturing the prongs using a metallic or plastic or equivalent material, the prongs can flex sufficiently to permit the second end 171 of the thermal switch to be pressed against the mounting clip 200, and then hold the thermal switch 170 against the or within the mounting clip 200. If the thermal switch 170 has a perimeter lip 173, then the prongs can flex sufficiently to pass over the lip, and then return towards an initial position and contact the cylindrical body of the thermal switch 170. In other words, the prongs enable the thermal switch to be walked or worked on to the mounting clip (angled installation) or snapped on to the mounting clip without angled installation. The thermal switch can be snapped onto the mounting clip prior to attaching the mounting clip to the refrigeration tube. In an alternative embodiment, the mounting clip 200 can include a structural plate that is spot welded, riveted, crimped, or otherwise attached to the elongated member. The structure plate then includes the prongs instead of the elongated member 210.
The first end 211 of the elongated member 210 and the second end 212 of the elongated member are positioned at the bottom portion 224 of the loop. In other words, the bending of the elongated member 210 is such that the ends terminate near each other on the bottom side 224 of the loop. The first end 211 of the elongated member and the second end 212 of the elongated member are configured to define a separable opening 227 to the loop such that the elongated member 210 and the thermal switch 170 can be pressed onto the refrigeration tube 180 via the separable opening 277. Accordingly, the first end 211 of the elongated member 210 and the second end 212 of the elongated member 212 move apart from each other when pressed over the refrigeration tube 180 and then return to an approximate initial position after passing the refrigeration tubing 180. In one configuration, ends 211 and 212 can be bent at an angle that assists the loop to separate when the opening 227 is pressed with sufficient force against the refrigeration tube 180. With the elongated member 210 formed from a material having some elastic or tensile properties (such as metal or plastic), the mounting clip 200 can be pressed over the refrigeration tube 180, causing the ends 211 and 212 to separate widening the opening 227 to allow passage of the loop over the refrigeration tube 180.
In some embodiments, the a thickness of the elongated member and loop geometry can be selected such that the loop is sized to fit between U-bends of adjacent refrigeration tubing, such as bunched return bends on the end of an evaporator unit.
While this invention has been particularly shown and described with references to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present application as defined by the appended claims. Such variations are intended to be covered by the scope of this present application. As such, the foregoing description of embodiments of the present application is not intended to be limiting. Rather, any limitations to the invention are presented in the following claims.

Claims

1. A two part thermal switch mounting clip comprising:

an elongated member having a first end and a second end, the elongated member being bent at multiple points such that the elongated member forms a loop sized to pass around both a refrigeration tube and a thermal switch in contact with the refrigeration tube, the loop defining a top portion, a bottom portion, a first side portion, and a second side portion, the thermal switch having a substantially cylindrical body including a first end and a second end, the first end of the thermal switch being substantially flat, the second end of the thermal switch having a generally concave surface shaped to conform to a portion of curvature of the refrigeration tube for thermal contact between the thermal switch and the refrigeration tube, the thermal switch controlling defrost cycles of a refrigeration system, the first end of the elongated member and the second end of the elongated member positioned at the first side portion of the loop, the first end of the elongated member configured to releasably interlock with the second end of the elongated member such that when interlocked the elongated member presses the thermal switch against the refrigeration tube securing contact between the thermal switch and the refrigeration tube; and

a separate structural plate attached to the top portion of the loop, the structural plate having multiple prongs tensioned to releasably hold the thermal switch within the loop of the elongated member.

2. The two part thermal switch mounting clip of claim 1, wherein the thermal switch having a generally concave surface shaped to conform to a portion of curvature of the refrigeration tube includes being sized to conform to a U-bend of evaporator tubing.

3. The two part thermal switch mounting clip of claim 2, wherein a thickness of the elongated member and loop geometry are selected such that the loop is sized to fit between U-bends of adjacent refrigeration tubing

4. The two part thermal switch mounting clip of claim 1, wherein the first end of the elongated member and the second end of the elongated member interlock by being bent to each form a hook.

5. The two part thermal switch mounting clip of claim 1, wherein the separate structure plate includes at least three prongs adapted to releasably hold the two-part thermal switch.

6. The two part thermal switch mounting clip of claim 1, wherein the separate structural plate is spot welded to the elongated member.

7. The two part thermal switch mounting clip of claim 1, wherein the separate structural plate is riveted to the elongated member.

8. The two part thermal switch mounting clip of claim 1, wherein the separate structural plate is crimped to the elongated member.

9. A thermal switch mounting clip comprising:

an elongated member having a first end and a second end, the elongated member being bent at multiple points such that the elongated member forms a loop sized to pass around both a refrigeration tube and a thermal switch in contact with the refrigeration tube, the loop defining a top portion, a bottom portion, a first side portion, and a second side portion, the thermal switch having a substantially cylindrical body including a first end and a second end, the first end of the thermal switch being substantially flat, the second end of the thermal switch having a generally concave surface shaped to conform to a portion of curvature of the refrigeration tube for thermal contact between the thermal switch and the refrigeration tube, the thermal switch controlling defrost cycles of a refrigeration system, the top portion of the loop having a thermal switch securing mechanism that releasably holds the thermal switch relative to the elongated member using multiple spring tension prongs, the multiple spring tension prongs adapted to releasably hold the thermal switch to the elongated member, the first end of the elongated member and the second end of the elongated member positioned at the bottom portion of the loop, the first end of the elongated member and the second end of the elongated member configured to define a separable opening to the loop such that the elongated member and the thermal switch can be pressed onto the refrigeration tube via the separable opening such that the first end of the elongated member and the second end of the elongated member move apart from each other when pressed over the refrigeration tube and then return to an approximate initial position after passing the refrigeration tubing.

10. The thermal switch mounting clip of claim 9, wherein the thermal switch securing mechanism includes the elongated member having multiple spring tension prongs located at the top portion of the loop.

11. The thermal switch mounting clip of claim 9, wherein the thermal switch securing mechanism includes a structural plate attached to the top portion of the loop, the structural plate having multiple prongs tensioned to releasably hold the thermal switch within the loop of the elongated member.

12. The thermal switch mounting clip of claim 11, wherein the structure plate includes at least three prongs adapted to releasably hold the thermal switch.

13. The thermal switch mounting clip of claim 11, wherein the structural plate is spot welded to the elongated member.

14. The thermal switch mounting clip of claim 11, wherein the structural plate is riveted to the elongated member.

15. The thermal switch mounting clip of claim 11, wherein the structural plate is crimped to the elongated member.

16. The thermal switch mounting clip of claim 9, wherein the thermal switch having a generally concave surface shaped to conform to a portion of curvature of the refrigeration tube includes being sized to conform to a U-bend of evaporator tubing.

17. The thermal switch mounting clip of claim 16, wherein a thickness of the elongated member and loop geometry are selected such that the loop is sized to fit between U-bends of adjacent refrigeration tubing

18. The thermal switch mounting clip of claim 9, wherein the first end of the elongated member and the second end of the elongated member define the separable opening by each being bent at an angle that causes the loop to separate when the opening is pressed sufficiently against the refrigeration tube.