Air conditioning connection device

Abstract

To provide an air conditioning connection device capable of easily connecting an end of an air conditioning duct and an air conditioning equipment in an air conditioning installation of a building in a short time, and applicable to plural kinds of connection pipes with different materials, shapes and the like.SOLUTION: An end of an air conditioning duct 3 is connected to connection pipes 10, 20 of an air conditioning equipment 2 via an air conditioning connection device 4. A connection cylinder body 30 of the air conditioning connection part 4 is communicated with the end of the air conditioning duct 3 via the connection cylinder body 40, and the connection cylinder body 30 is fitted with an outer periphery of the connection pipe 10 or 20. A spiral fitting convex bar 33 projecting inward in a radial direction of the connection cylinder body 30 of an air conditioning connection device 4A is bitten into the connection pipe 10 made of foamed resin. An outer peripheral ring part 25 of the connection pipe 20 is fitted with an annular inner peripheral groove 35 provided away from the biting convex bar 33 of the connection cylinder body 30 of an air conditioning connection device 4B in a cylinder axial direction.SELECTED DRAWING: Figure 7

Description

【Technical Field】 【0001】 The present invention relates to a connection structure in a building air conditioning facility, and particularly to an air conditioning connection device that connects the end of an air duct to air conditioning equipment. 【Background Art】 【0002】 Generally, buildings such as houses, commercial buildings, and factories are equipped with air conditioning facilities for heating, cooling, and ventilation. For example, air ducts that form an air flow path are piped in the ceiling space. Short connection pipes protrude from the air conditioning equipment for heating, cooling, and ventilation. The end of the air duct is fitted around the outer periphery of the connection pipe. An adhesive tape or a band is wound around the outer peripheral side of the end of the air duct. Furthermore, the duct is prevented from coming off by pins, nails, staples, etc. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 10-197039 【Patent Document 2】 Japanese Patent Application Laid-Open No. 2016-035345 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the conventional air conditioning connection structure, the operations of winding an adhesive tape or a band and further driving pins, etc. are complicated, time-consuming, and require a certain degree of skill. As connection pipes for air conditioning equipment, those made of rigid resin or foamed resin have emerged, and such connection pipes cannot be driven with pins, etc. In view of such circumstances, an object of the present invention is to provide an air conditioning connection device that can easily connect the end of a duct to air conditioning equipment in a short time in a building air conditioning facility and can be used in common for a plurality of types of connection pipes having different specifications such as materials. 【Means for Solving the Problems】 【0005】 To solve the aforementioned problems, the present invention provides an air conditioning connection device for connecting the end of an air conditioning duct to a connecting pipe of an air conditioning unit, The air conditioning duct is connected to the end of the connecting pipe and includes a connecting cylinder that fits around the outer circumference of the connecting pipe. The connecting cylinder is characterized in that the inner circumference is formed with spiral-shaped engagement protrusions that can bite into the foamed resin and an annular inner groove of a constant width along its entire circumference, spaced apart from each other in the direction of the cylinder axis. 【0006】 By inserting a connecting pipe made of foamed resin into the aforementioned protruding groove, the air conditioning equipment having the connecting pipe made of foamed resin can be easily connected to the connecting cylinder. By fitting an outer ring portion with a width corresponding to the width of the annular inner groove into the annular inner groove, the air conditioning equipment having the connecting pipe on which the outer ring portion is formed can be easily connected to the connecting cylinder. 【0007】 Preferably, on the air conditioning duct side in the axial direction of the connecting cylinder, an annular wall is formed that protrudes radially inward from the recessing protrusion and the annular inner groove of the connecting cylinder, thereby restricting the insertion position of the connecting pipe. [Effects of the Invention] 【0008】 According to the air conditioning connection device of the present invention, the end of an air conditioning duct in a building's air conditioning system can be easily and quickly connected to an air conditioning unit, and it can be used for multiple types of connecting pipes that differ in material, shape, etc. [Brief explanation of the drawing] 【0009】 [Figure 1] Figure 1 is a plan view of an air conditioning system equipped with two air conditioning connection structures, each including an air conditioning connection device according to one embodiment of the present invention. [Figure 2] Figure 2 is a plan cross-sectional view of the upstream of the two air conditioning connection structures mentioned above. [Figure 3] Figure 3 is a plan cross-sectional view of the downstream of the two air conditioning connection structures mentioned above. [Figure 4]Figure 4(a) is an exploded plan view showing the air conditioning connection device with its equipment-side connection cylinder and duct-side connection cylinder separated. Figure 4(b) is an exploded cross-sectional view of the air conditioning connection device in the separated state. [Figure 5] Figure 5 is a front cross-sectional view of the equipment-side connecting cylinder along the VV line in Figure 4(a). [Figure 6] Figure 6(a) is a front cross-sectional view of the equipment-side connecting cylinder along the line VIa-VIa in Figure 4(a). Figure 6(b) is a front cross-sectional view of the duct-side connecting cylinder along the line VIb-VIb in Figure 4(a). [Figure 7] Figure 7 is a plan view showing a portion of the air conditioning equipment in cross-section, in a state where elements of the air conditioning system are about to be connected. [Figure 8] Figure 8 is a front cross-sectional view along line VIII-VIII in Figure 7, showing the state after the connection has progressed to the position indicated by the dashed line in Figure 7. [Figure 9] Figure 9 is a front cross-sectional view along the line IX-IX in Figure 2. [Modes for carrying out the invention] 【0010】 One embodiment of the present invention will be described below with reference to the drawings. As shown in Figure 1, the air conditioning system 1 comprises two air conditioning units 2, an air conditioning duct 3, and two air conditioning connection devices 4. The two air conditioning units 2 are connected by the air conditioning duct 3. Furthermore, each air conditioning unit 2 and the air conditioning duct 3 are connected via the air conditioning connection device 4. In other words, both ends of the air conditioning duct 3 are connected to the air conditioning units 2 via the air conditioning connection device 4. Hereafter, when distinguishing between the two air conditioning units 2, the designations "A" and "B" will be added to their respective labels. When distinguishing between the two air conditioning connection devices 4, the one on the side of the first air conditioning unit 2A will be designated with the designation "A," and the one on the side of the second air conditioning unit 2B will be designated with the designation "B." 【0011】 Although detailed illustrations are omitted, the first air conditioner 2A is a box-shaped air conditioning chamber, and its outer surface is covered with a heat insulation cover 2c made of a rigid foam resin such as EPS. As shown in Fig. 2, a 1 connection pipe 10 protrudes from the air conditioner 2A. The connection pipe 10 is composed of a rigid foam resin integral with the heat insulation cover 2c. A step 10d is formed on the outer periphery of the connection pipe 10. The outer diameter of the pipe portion 12 on the tip side (right side in Fig. 2) from the step 10d is smaller than the outer diameter of the pipe portion 11 on the air conditioner 2A side (left side in Fig. 2) from the step 10d. A locking ring portion 13 protruding in the radial direction is provided on the outer periphery of the tip side pipe portion 12. 【0012】 As shown in Fig. 1, the second air conditioner 2B is a Y-shaped branch chamber. The conditioned air from the first air conditioner 2A is diverted in the second air conditioner 2A through the air duct 3. As shown in Fig. 3, a 2nd connection pipe 20 protrudes from the air conditioner 2B. The material of the connection pipe 20 is metal or non-foamed rigid resin. Two outer peripheral ring portions 24, 25 protruding in the radial direction are formed side by side on the outer periphery of the connection pipe 20. The outer peripheral ring portions 24, 25 are formed in a semi-circular cross section with a constant width over the entire circumference of the connection pipe 20. Therefore, the connection pipes 10, 20 of the air conditioners 2A, 2B are different from each other in terms of material and shape. Note that each air conditioner 2 is not limited to an air conditioning chamber or a branch chamber, and may be a heating and cooling module, an air outlet unit, a ventilation chamber, a duct, etc. 【0013】 As shown in Figs. 1 to 3, the air duct 3 is composed of, for example, a flexible duct that can be expanded, contracted, and bent, made of a spiral bellows pipe having a spiral rib portion 3a. Note that the air duct is not limited to this, and may be a flexible duct having a flexible heat insulation layer and a spiral core material, or a rigid (non-flexible) duct. 【0014】 As shown in Fig. 1, the first air conditioning connection device 4A and the second air conditioning connection device 4B have the same structure as each other. As shown in Fig. 4(a), the air-conditioning connection device 4(4A, 4B) includes a connection cylinder body 30 on the equipment side and a connection cylinder body 40 on the duct side. As shown in Fig. 1, the connection cylinder body 30 on the equipment side is connected to the connection pipes 10, 20 of the air-conditioning equipment 2. The connection cylinder body 40 on the duct side is connected to the end of the air-conditioning duct 3. The connection cylinder bodies 30 and 40 are detachably connected to each other. The connection cylinder body 30 on the equipment side is continuous with the end of the air-conditioning duct 3 through the connection cylinder body 40 on the duct side. 【0015】 Specifically, as shown in Fig. 4(b), the connection cylinder body 30 on the equipment side has a large-diameter cylinder part 31 on the air-conditioning equipment 2 side (the left side in Fig. 4(b)) and a small-diameter cylinder part 32 on the air-conditioning duct 3 side (the right side in Fig. 4(b)). As shown in Figs. 2 and 3, the large-diameter cylinder part 31 is fitted on the outer periphery of the connection pipes 10, 20. The small-diameter cylinder part 32 is formed to have a smaller diameter than the connection pipes 10, 20. 【0016】 As shown in Figs. 4(a) and (b), on the large-diameter cylinder part 31, there are a biting ridge 33, an annular inner peripheral protrusion 34, an annular inner peripheral groove 35, an annular outer peripheral groove 36, an annular raised part 50 and a guide groove 53, which are arranged in this order in the cylinder axis direction (the left-right direction in Fig. 4) from the air-conditioning equipment 2 side (the left side in Fig. 4). 【0017】 As shown in Fig. 4(a), the end of the large-diameter cylinder part 31 on the air-conditioning equipment 2 side (the left side in Fig. 4(a)) constitutes an end ring part 31a. The end ring part 31a has a slightly larger diameter than the cylinder part 31b on the air-conditioning duct 3 side (the right side in Fig. 4(a)) from the end ring part 31a. 【0018】 As shown in Fig. 4(b), a biting ridge 33 is provided on the inner periphery of the end ring part 31a. The biting ridge 33 is formed with a pointed triangular cross-section, protrudes radially inward of the connection cylinder body 30 on the equipment side, and extends spirally. The diameter of the spiral top 33a of the biting ridge 33 is slightly smaller than the outer diameter of the pipe part 11 (Fig. 2). The biting ridge 33 can bite into the foamed resin such as EPS constituting the connection pipe 10. 【0019】 As shown in Figure 4(b), an annular inner circumferential projection 34 is positioned between the end ring portion 31a and the cylindrical portion 31b. As shown in Figure 5, the annular inner circumferential projection 34 forms an annular shape around the entire circumference of the equipment-side connecting cylindrical body 30 and protrudes radially inward. As shown in Figure 4(b), the cross-section of the annular inner circumferential projection 34 is trapezoidal. The wall portion 34a on the air conditioning equipment 2 side (left side in Figure 4(b)) of the annular inner circumferential projection 34 is inclined radially inward from the end ring portion 31a toward the air conditioning duct 3 side (right side in Figure 4(b)). 【0020】 As shown in Figure 4(b), the protruding end face 34b of the annular inner circumferential projection 34 protrudes radially inward from the recessed protrusion 33. As shown in Figure 5, the protruding end face 34b has a plurality (four in this case) of projections 34c that protrude further radially inward. Each projection 34c extends in an arc shape in the circumferential direction of the protruding end face 34b. The four projections 34c are spaced apart from each other in the circumferential direction. An arc-shaped notch 34e is formed between adjacent projections 34c. 【0021】 As shown in Figure 4(b), the annular inner groove 35 is positioned away from the recessed protrusion 33 in the axial direction of the cylinder and close to the air conditioning duct 3 side (right side in Figure 4(b)) of the annular inner projection 34. The annular inner groove 35 has a constant width around the entire circumference of the equipment-side connecting cylinder 30 and is recessed from the inner circumference to the outer circumference of the equipment-side connecting cylinder 30. The width of the annular inner groove 35 is slightly smaller than the width of the outer ring portion 25. The diameter at the bottom of the annular inner groove 35 is slightly smaller than the outer diameter of the outer ring portion 25. As shown in Figure 4(a), the portion of the annular inner groove 35 that is viewed from the outside of the equipment-side connecting cylinder 30 is an annular protrusion 35b. 【0022】 As shown in Figure 4(b), the annular outer groove 36 is positioned close to the air conditioning duct 3 side (right side in Figure 4(b)) of the annular inner groove 35, and is recessed inward along its entire circumference when viewed from the outside of the equipment-side connecting cylinder 30. The portion of the annular outer groove 36 that is positioned when viewed from the inside of the equipment-side connecting cylinder 30 is an annular protrusion 36b. As shown in Figure 9, a stopper 36s is provided at one location in the annular outer groove 36, protruding radially outward from the bottom of the groove. 【0023】 As shown in Figure 4(a), an annular raised portion 50 is positioned at the end of the large-diameter cylindrical portion 31 on the side of the air conditioning duct 3 (right side in Figure 4(a)). The annular raised portion 50 is raised further outward than the adjacent annular protrusion 36b. As shown in Figure 6(a), the cross-section of the annular raised portion 50 is formed in an annular wave shape, with long wave portions 51 rising radially outward and short wave portions 52 concave radially inward alternating in the circumferential direction. Guide grooves 53 are formed by the radially outward-facing surfaces of the wave portions 52. Multiple (eight in this case) guide grooves 53 are formed in the annular raised portion 50. The eight guide grooves 53 are arranged at equal intervals in the circumferential direction of the annular raised portion 50. As shown in Figure 4(a), each guide groove 53 is concave from the outer circumferential surface of the annular raised portion 50 and crosses the annular raised portion 50 in the direction of the cylindrical axis. The bottom of the guide groove 53 is flush with and continuous with the bottom of the annular outer groove 36. As shown in Figure 9, the guide groove 53 is offset in the circumferential direction relative to the stopper 36s. 【0024】 As shown in Figure 4(b), an annular wall 37 is formed between the large-diameter cylindrical portion 31 and the small-diameter cylindrical portion 32 in the equipment-side connecting cylinder 30. Therefore, the annular wall 37 is positioned on the air conditioning duct 3 side (right side in Figure 4(b)) from the annular inner circumferential projection 34 and the annular convex portion 36b. The annular wall 37 protrudes radially inward from the annular inner circumferential projection 34 and the annular convex portion 36b, and the annular wall 37 is inclined toward the small-diameter cylindrical portion 32 side (right side in Figure 4(b)) as it extends radially inward. 【0025】 As shown in Figure 4(a), a small-diameter cylindrical portion 32 is connected to the radially inner end of the annular wall 37. A pressure-contact sealing portion 38 is formed on the small-diameter cylindrical portion 32. The pressure-contact sealing portion 38 is formed in a semicircular cross-sectional shape, protrudes radially outward from the small-diameter cylindrical portion 32, and extends in an annular shape around the entire circumference of the small-diameter cylindrical portion 32. 【0026】 As shown in Figure 4(a), the duct-side connecting cylinder 40 has an equipment-side cylinder 41 and a duct-side cylinder 42. As shown in Figure 6(b), the cross-section of the middle section of the equipment-side cylinder 41 is formed in an annular wave shape with long wave sections 61 that rise radially outward and short wave sections 62 that recess radially inward alternating in the circumferential direction. The short wave sections 62 constitute the locking projections 63. Eight (or more) locking projections 63 that protrude radially inward are formed in the middle section of the equipment-side cylinder 41. The eight locking projections 63 are arranged at equal intervals in the circumferential direction of the duct-side connecting cylinder 40. 【0027】 As shown in Figure 4(a), a trapezoidal constricted portion 47 is formed between the equipment-side cylindrical portion 41 and the duct-side cylindrical portion 42 of the duct-side connecting cylinder 40. As shown in Figure 4(b), the constricted portion 47 forms an annular shape around the entire circumference of the duct-side connecting cylinder 40 and protrudes inward. The protruding end of the constricted portion 47 facing radially inward constitutes a pressure-contact seal portion 48. The pressure-contact seal portion 48 has a cylindrical surface that is slightly smaller in diameter and wider than the pressure-contact seal portion 38. 【0028】 As shown in Figure 4(b), spiral ridges 49 are formed on the duct-side cylindrical portion 42. The spiral ridges 49 protrude radially inward from the inner circumferential surface 42a of the duct-side cylindrical portion 42. As shown in Figure 4(a), when the portion where the spiral ridges 49 are formed is viewed from the outside of the duct-side cylindrical portion 42, it appears as a spiral groove 49b. 【0029】 As shown in Figure 3, the inner diameter of the inner circumferential surface 42a of the duct-side cylindrical portion 42 is slightly larger than the outer diameter of the air conditioning duct 3. The spiral pitch of the spiral projection 49 is approximately equal to the spiral pitch when the spiral portion 3a of the air conditioning duct 3 is not expanding or contracting. 【0030】 Using two air conditioning connection devices 4, each air conditioning unit 2 and the air conditioning duct 3 are connected as follows, and consequently, air conditioning units 2A and 2B are connected to each other. First, as shown in Figure 7, the first air conditioning unit 2A and the equipment-side connecting cylinder 30 of the first air conditioning connection device 4A are connected. That is, the equipment-side connecting cylinder 30 of the air conditioning connection device 4A is fitted onto the outer circumference of the connecting pipe 10. At this time, the equipment-side connecting cylinder 30 is pushed toward the air conditioning unit 2A while rotating it in the same direction as the spiral direction of the biting projection 33. As a result, the biting projection 33 bites into the outer circumference of the pipe portion 11 of the connecting pipe 10 (Figure 2). Eventually, the annular step 10d abuts against the wall portion 34a of the annular inner projection 34, and the tip of the pipe portion 12 abuts against the annular wall 37, thereby restricting the fitting position of the equipment-side connecting cylinder 30 to the connecting pipe 10 (Figure 2). 【0031】 As shown in Figure 2, the annular step 10d is in close contact with the wall portion 34a around its entire circumference. Furthermore, the tip of the pipe portion 12 is in close contact with the annular wall 37 around its entire circumference. This ensures an airtight seal between the connecting pipe 10 and the equipment-side connecting cylinder 30. 【0032】 Furthermore, as shown in Figure 7, the second air conditioning unit 2B and the equipment-side connecting cylinder 30 of the second air conditioning connection device 4B are connected. That is, the equipment-side connecting cylinder 30 of the air conditioning connection device 4B is fitted onto the outer circumference of the connecting pipe 20. At this time, the equipment-side connecting cylinder 30 of the air conditioning connection device 4B is fitted onto the outer circumference of the connecting pipe 20 of the air conditioning unit 2B, and the equipment-side connecting cylinder 30 is pushed toward the air conditioning unit 2B. As a result, the tip-side outer circumference ring portion 25 overcomes the annular inner circumference projection 34 and fits into the annular inner circumference groove 35 (Figure 3). By intermittently arranging the projections 34c of the annular inner circumference projection 34 in the circumferential direction to form notches 34e (Figure 5), the tip-side outer circumference ring portion 25 can easily overcome the annular inner circumference projection 34. 【0033】 As shown in Figure 3, the outer peripheral ring portion 25 at the tip is in close contact with the inner surface of the annular inner groove 35 around its entire circumference. In addition, the tip of the connecting pipe 20 abuts against the annular wall 37 and is in close contact with the annular wall 37 around its entire circumference. This restricts the fitting position of the equipment-side connecting cylinder 30 to the connecting pipe 20 and ensures an airtight seal between the connecting pipe 20 and the equipment-side connecting cylinder 30. 【0034】 As shown in Figure 7, the duct-side connecting cylinders 40 of the air conditioning connection device 4 are connected to both ends of the air conditioning duct 3. Specifically, the duct-side cylindrical portion 42 of the duct-side connecting cylinder 40 of the first air conditioning connection device 4A is fitted onto the outer circumference of the end of the air conditioning duct 3 on the side of the first air conditioning equipment 2A. At this time, the spiral portion 3a and the spiral projection 49 are interlocked by fitting the duct-side connecting cylinder 40 while rotating it (Figure 2). Similarly, the duct-side cylindrical portion 42 of the duct-side connecting cylinder 40 of the second air conditioning connection device 4B is fitted onto the outer circumference of the end of the air conditioning duct 3 on the side of the second air conditioning equipment 2B while rotating it, so that the spiral portion 3a and the spiral projection 49 are interlocked (Figure 3). 【0035】 Subsequently, as shown in Figure 7, the air conditioning duct 3 is retracted, and the duct-side connecting cylinders 40 at both ends of the air conditioning duct 3 are fitted onto the outer circumference of the corresponding equipment-side connecting cylinder 30. At this time, as shown in Figure 8, the angle of the duct-side connecting cylinder 40 is adjusted so that the circumferential positions of the locking projection 63 and the guide groove 53 coincide. This allows the locking projection 63 to pass through the guide groove 53 in the direction of the cylinder axis, as shown by the dashed line in Figure 7. The locking projection 63 is then positioned on the outer circumference of the annular outer groove 36 (Figures 2 and 3). 【0036】 As shown in Figures 2 and 3, the tip 41e of the equipment-side cylindrical portion 41 abuts against the corner portion 34d (fitting restriction portion) formed by the wall portion 34a and the end ring portion 31a of the equipment-side connecting cylindrical body 30. Also, the constricted portion 47 of the trapezoidal cross-section abuts against the annular wall 37 (fitting restriction portion). This restricts the fitting position of the duct-side connecting cylindrical body 40 with the equipment-side connecting cylindrical body 30. Furthermore, the pressure-contact sealing portion 38 is in close contact with the pressure-contact sealing portion 48 around its entire circumference. This ensures an airtight seal between the cylindrical bodies 30 and 40. 【0037】 After the initial fitting, the duct-side connecting cylinder 40 is rotated relative to the equipment-side connecting cylinder 30, as shown in Figure 9. This causes the locking projection 63 to shift away from the guide groove 53 and face the annular protrusion 50 in the direction of the cylinder axis (perpendicular to the plane of the paper in Figure 9). Therefore, when attempting to pull the duct-side connecting cylinder 40 away from the equipment-side connecting cylinder 30, the locking projection 63 strikes the annular protrusion 50 and locks in the direction of the cylinder axis. This prevents the duct-side connecting cylinder 40 from coming out of the equipment-side connecting cylinder 30. Furthermore, the locking projection 63 abuts against the stopper 36s. This prevents the duct-side connecting cylinder 40 from rotating relative to the equipment-side connecting cylinder 30. 【0038】 In this way, the equipment-side connecting cylinder 30 and the duct-side connecting cylinder 40 can be easily connected. Consequently, the connecting pipes 10 and 20 of each air conditioning unit 2 and the air conditioning duct 3 can be easily and quickly connected via the air conditioning connection device 4. 【0039】 As shown in Figures 1 and 7, the two air conditioning connection devices 4 have the same structure, so there is no need to distinguish between the air conditioning connection device 4 for the first air conditioning unit 2A and the air conditioning connection device 4 for the second air conditioning unit 2B. In other words, one air conditioning connection device 4 can be used for both connecting the first air conditioning unit 2A to the air conditioning duct 3 and connecting the second air conditioning unit 2B to the air conditioning duct 3. Whether the connecting pipe of the air conditioning unit 2 is a foamed resin pipe 10 or a rigid pipe 20, it can be easily connected to the air conditioning duct 3 via the air conditioning connection device 4. Therefore, the air conditioning connection device 4 can be used for multiple types of connecting pipes 10 and 20 with different specifications such as material and shape. 【0040】 The present invention is not limited to the embodiments described above, and various modifications can be made without departing from its spirit. For example, the connecting cylinder 30 may have a duct connection portion that is directly connected to the air conditioning duct 3, and the duct-side connecting cylinder 40 may be omitted. The recessed protrusion 33 may be positioned on the air conditioning duct 3 side of the annular inner groove 35 in the equipment-side connecting cylinder 30. [Industrial applicability] 【0041】 This invention is applicable to air conditioning systems in buildings. [Explanation of Symbols] 【0042】 1 Air conditioning equipment 2(2A,2B) Air conditioning equipment 10 connecting pipes 20 connecting pipes 25. Outer ring portion at the tip (outer ring portion) 3. Air conditioning ducts 3a Spiral section 4(4A,4B) Air conditioning connection device 30 Equipment side connection cylinder (connection cylinder) 33 Indented protrusions 33a Spiral top 34 Circumferential projection of annularity 34a wall 34b Projecting end surface 34c protrusion 34d corner 34e Notch 35 Annular inner groove 36 Annular outer groove 37 Ring Wall 38 Pressure-sealed section 40 Duct-side connecting cylinder 48 Pressure-sealed section 49 Spiral ridges

Claims

[Claim 1] An air conditioning connection device for connecting the end of an air conditioning duct to a first connecting pipe made of rigid foamed resin of an air conditioning unit, or a second connecting pipe made of metal or non-foamed rigid resin with an outer ring portion formed on its outer circumference, The air conditioning duct is connected to the end of the air conditioning duct and includes a connecting cylinder that fits onto the outer circumference of the first connecting pipe or the outer circumference of the second connecting pipe, An air conditioning connection device characterized in that the inner circumference of the connecting cylinder has a spiral-shaped engagement projection that can bite into the first connecting pipe made of rigid foamed resin, and an annular inner groove of a constant width that extends around the entire circumference into which the outer ring portion can be fitted, both of which are spaced apart in the direction of the cylinder axis. [Claim 2] The air conditioning connection device according to claim 1, characterized in that an annular wall is formed on the air conditioning duct side in the direction of the cylinder axis from the recessing protrusion and the annular inner groove of the connecting cylinder, protruding radially inward from the recessing protrusion to restrict the fitting position of the first connecting pipe or the second connecting pipe.

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