JP5641403B2 - SEAL CONNECTION STRUCTURE OF MULTI-TUBE BODY, HEAT EXCHANGER HAVING THE SAME, AND SEAL MEMBER USED FOR THE STRUCTURE - Google Patents

Description

  The present invention relates to a technique used to connect a plurality of pipe bodies to a desired connection target member, for example, when connecting a plurality of heat transfer tubes constituting a heat exchanger to a header for incoming water or hot water.

  For example, in a heat exchanger for a hot water supply apparatus, a plurality of heat transfer tubes are often connected to a header for entering or discharging water, and the header is used to allow water to enter or exit from the plurality of heat transfer tubes. It is. In such a connection structure of a plurality of heat transfer tubes and headers, it is necessary to consider so as not to cause water leakage. As a means for that purpose, there is a means using an O-ring (for example, FIG. 16 of Patent Document 1). And see FIG. Conventionally, when connecting a plurality of heat transfer tubes to a header, the basic structure is the same as the case where one tube is connected to one connection target member. More specifically, in the related art, a plurality of O-rings are individually fitted and attached to each of the plurality of heat transfer tubes, and a plurality of openings are formed in the header. It is set as the structure which makes a some heat-transfer tube approach into each of each part individually.

  However, there is still room for improvement in the prior art as described below.

  First, it is necessary to form a plurality of openings in the header for allowing a plurality of heat transfer tubes fitted with O-rings to enter. In addition, the plurality of openings must be provided at appropriate intervals. This is because if this interval is narrow, there is a problem that the strength of the portion between the plurality of openings (the partition wall portion of the adjacent openings) decreases, and it is necessary to avoid this. For this reason, the arrangement pitch of the plurality of openings tends to be relatively large, but the arrangement pitch of the heat transfer tubes is the same as the arrangement pitch of the plurality of openings. Therefore, conventionally, there are cases where it is difficult to reduce the arrangement pitch of the heat transfer tubes. In a heat exchanger, there is a case where it is desired to reduce the arrangement pitch of the heat transfer tubes for the purpose of increasing the heat exchange efficiency. However, conventionally, such a case may be difficult.

  Secondly, since it is necessary to mount a plurality of O-rings one by one on the plurality of heat transfer tubes, the mounting operation of the plurality of O-rings is complicated. In addition, the plurality of heat transfer tubes need to be individually entered into the plurality of openings provided in the header in a state where the O-ring is attached. Therefore, such work is also complicated. Furthermore, since it is necessary to prepare the same number of O-rings as the number of heat transfer tubes, the number of parts of the O-ring increases and the handling thereof becomes troublesome. For this reason, conventionally, the assembly workability when connecting a plurality of heat transfer tubes to the header is not so good, and there is still room for improvement in this respect.

JP 2006-317034 A

The present invention has been conceived under the circumstances as described above, and the arrangement pitch of a plurality of tubes such as heat transfer tubes of a heat exchanger can be made smaller than before, and It is an object of the present invention to provide a seal connection structure of a plurality of pipes that can be assembled with good workability, a heat exchanger provided with the structure, and a seal member used in the structure.

  In order to solve the above problems, the present invention takes the following technical means.

The multiple tube seal connection structure provided by the first aspect of the present invention includes a plurality of tubes, a connection target member having openings for allowing the plurality of tubes to enter, and the plurality of tubes. A plurality of O-ring portions that are externally fitted to each other, and a seal member for sealing a gap between the inner surface of the opening and the outer surface of the plurality of tubular bodies. are, a sealing connection structure of a plurality tube, the opening in the consolidated member, said plurality of tubes and the sealing member as a single opening which can be advanced within collectively The plurality of O-ring parts are integrally formed so as to be aligned on the same plane, and adjacent parts of the O-ring parts are connected integrally to each other. Is formed and the connection Is provided so as to be compressed between the plurality of tube bodies, and among the plurality of O-ring portions, the portions other than the connecting portions are the outer surfaces of the plurality of tube bodies and the inner surfaces of the opening portions. The plurality of O-ring portions are more radial than the portions other than the connection portions in a natural state where the plurality of O-ring portions are not attached to the plurality of pipe bodies. It is characterized by having a large width in the direction .

According to such a configuration, the following effects can be obtained.
1stly, the opening part provided in the connection object member is set as the structure which makes a some pipe body and a sealing member enter into an inside collectively, and several opening part is made into a connection object member by appropriate space | interval. There is no need to provide it. For this reason, in the present invention, unlike the prior art, there is no dimensional restriction that occurs when a plurality of openings are provided at appropriate intervals, and it is easy to reduce the arrangement pitch of the plurality of tubes. Can be realized.
Secondly, since the seal member has a configuration in which a plurality of O-ring portions are connected, it is possible to reduce the number of parts of the seal member and make it easy to handle as compared with the conventional O-ring. In addition, the work of externally fitting and attaching the plurality of O-ring portions to the plurality of heat transfer tubes is facilitated. Furthermore, the plurality of heat transfer tubes only need to enter the openings at once, and the work is also easier compared to the conventional case where the heat transfer tubes are entered one by one into the plurality of openings. It becomes. For this reason, according to the present invention, the assembly workability when connecting the plurality of heat transfer tubes to the header can be made better than before.

Furthermore, according to the said structure, a sealing member can be made into a small size and a simple shape, and the manufacturing cost can be made cheap. Moreover, although a connection part is a part arrange | positioned between adjacent pipe bodies, it becomes possible to make the arrangement pitch of a pipe body smaller by reducing the width | variety of this connection part.

Furthermore, according to the said structure, the following effects are acquired. In other words, the connecting portion of the O-ring portion is a portion that is located between adjacent tube bodies and contacts the outer surface of these tube bodies. Therefore, when the radial width of the connecting portion is small and thin, the amount of compressive deformation of the connecting portion cannot be increased, and the connecting portion can be pressed against the outer surface of the tubular body with a large force. It becomes difficult. On the other hand, according to the said structure, it becomes possible to eliminate such a concern and to press-connect a connection part with the big force with respect to the outer surface of a tubular body. Therefore, it is preferable that the portion of the outer surface of the tubular body that comes into contact with the connecting portion is not inferior in sealing performance to other portions, and the sealing performance is excellent.

  In the present invention, preferably, in a natural state where the plurality of O-ring portions are not attached to the plurality of pipe bodies, the inner surface of the connecting portion has a curvature larger than the radius of curvature of the inner surface of a portion other than the connecting portion. It has a circular arc shape with a radius.

  According to such a configuration, the radial width of the connecting portion can be made larger than the width of the portion other than the connecting portion so as not to generate a portion where the inner surface shape greatly changes in each O-ring portion. . If there is a place where the shape of the inner surface of each O-ring part changes drastically, it will be difficult to bring this part into close contact with the outer surface of the tubular body, resulting in poor sealing performance. Is possible.

  In the present invention, preferably, a spacer is provided on the plurality of tubes so as to regulate relative displacement between the plurality of tubes, and the spacer includes the plurality of O-ring portions. It abuts on one side of each.

  According to such a configuration, since the relative displacement between the plurality of tube bodies is restricted due to the presence of the spacers, it is preferable for stably fixing the plurality of tube bodies. In addition, since the spacer is also used for positioning a plurality of O-ring portions, it is not necessary to separately use a positioning member for the O-ring portion, and the configuration thereof is reasonable.

  The heat exchanger provided by the second aspect of the present invention is connected to a plurality of heat transfer tubes and one end of the plurality of heat transfer tubes, and allows fluid to flow into or out of the plurality of heat transfer tubes. The heat exchanger includes a plurality of heat transfer tubes and a multi-tube seal connection structure provided by the first aspect of the present invention as the connection structure of the plurality of heat transfer tubes and the header. It is characterized by having.

  According to such a configuration, in the connection structure between the plurality of heat transfer tubes and the header, the same effect as described in the seal connection structure of the multiple tubes provided by the first aspect of the present invention can be obtained. It is optimal for reducing the arrangement pitch of a plurality of heat transfer tubes for the purpose of increasing the heat exchange efficiency of the heat exchanger.

In the case where the sealing member provided by the third aspect of the present invention connects a plurality of pipes and a connection target member having an opening capable of collectively entering the plurality of pipes, A seal member used to seal a gap between an inner surface of the opening and an outer surface of the plurality of tubes , and is inserted into the opening and is fitted to each of the plurality of tubes. A plurality of O-ring portions are connected in series, and the plurality of O-ring portions are integrally formed so as to be aligned on the same plane, and the adjacent O-ring portions are connected to each other. A connecting part in which the approaching parts are integrally connected is formed, the connecting part is compressible between the plurality of tubular bodies, and the connecting part among the plurality of O-ring parts. Other than the above, The plurality of O-ring portions are compressible between the outer surfaces of several tubular bodies and the inner surfaces of the openings, and in the natural state where the plurality of O-ring portions are not attached to the plurality of tubular bodies, It is characterized in that the radial direction width is larger than the portion other than the connecting portion .

  The seal member having such a configuration can be suitably used for implementing the multi-tubular seal connection structure provided by the first aspect of the present invention.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

(A) is a plane sectional view showing an example of the heat exchanger concerning the present invention, and (b) is the front sectional view. It is II-II sectional drawing of Fig.1 (a). FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a principal part disassembled perspective view of the heat exchanger shown to Fig.1 (a), (b). An example of the sealing member which concerns on this invention is shown, (a) is Va-Va sectional drawing of (b), (b) is a front view, (c) is Vc-Vc of (b). It is sectional drawing, (d) is Vd-Vd sectional drawing of (b). FIG. 6 is a partially enlarged explanatory view of FIG. An example of a spacer is shown, (a) is an exploded perspective view, and (b) is an exploded front view. It is a principal part perspective view which shows the other example of this invention. It is IX-IX sectional drawing of FIG. FIG. 9 is an exploded perspective view of FIG. 8. It is a principal part fracture perspective view of FIG. It is principal part sectional drawing which shows the other example of this invention. (A)-(c) is a front view which shows the other example of the sealing member which concerns on this invention.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

1 to 7 show an example of a heat exchanger having a multi-tubular seal connection structure to which the present invention is applied, and a configuration related thereto.
As clearly shown in FIG. 1, the heat exchanger HE of the present embodiment includes a substantially rectangular parallelepiped case 2, a plurality of heat transfer tubes 1 accommodated in the case 2, and a pair of headers 3 (3 </ b> A). 3B). As a means for connecting the pair of headers 3 and the plurality of heat transfer tubes 1, seal connection structures C1 and C2 having a plurality of tubes are adopted. Each heat transfer tube 1 corresponds to a specific example of the “tube” according to the present invention, and the header 3 corresponds to a specific example of the “member to be connected” according to the present invention.

  The plurality of heat transfer tubes 1 have a plurality of helical tube portions that are oval in plan view. The plurality of helical tube portions are different in size from each other and are arranged in a substantially concentric overlapping shape. The upper end side and the lower end side portion of each heat transfer tube 1 are formed as straight tubular body portions 10 a and 10 b that extend substantially horizontally, and the end portions of these straight tubular body portions 10 a and 10 b are connected to the header 3. . A heating medium for heating each heat transfer tube 1 can flow into the case 2. More specifically, for example, a combustion gas generated by a burner (not shown) is used as the heating medium, and this combustion gas enters the case 2 from the air supply port 21 of the rear wall portion 20a of the case 2. After that, it is discharged to the outside as exhaust gas from the exhaust port 22 of the front wall portion 20b. In such a progression process of the combustion gas, the combustion gas acts on each part of the plurality of heat transfer tubes 1, and hot water flowing through each heat transfer tube 1 is heated. The header 3 has an opening 30 for entering or discharging water. In this heat exchanger HE, hot water supplied to the opening 30 of the lower header 3 (3B) flows into each heat transfer tube 1 and is heated by heat exchange with the combustion gas. The heated hot water is discharged from the opening 30 of the upper header 3 (3A) to the outside and supplied to a desired hot water supply destination.

  As shown in FIGS. 2 to 4, in the seal connection structure C <b> 1, a seal member 4, a spacer 5, and a sheet-like packing 6 are used as a connection means between the plurality of heat transfer tubes 1 and the header 3.

The seal member 4 is made of an elastic material such as nitrile rubber (NBR) or other rubber. As shown in FIG. 5, the seal member 4 has a configuration in which a plurality of O-ring portions 40 are connected in a certain direction on the same plane and are integrally formed. The two O-ring portions 40 adjacent to each other have a connecting portion 40b that connects the mutually approaching portions. In each O-ring part 40, as shown in FIG. 5A, the non-joining part 40a has a circular cross section, whereas the joint part 40b has an elliptical cross section.

  The lateral width L1 of the constricted portion of the connecting portion 40b (the minimum width of the connecting portion 40b in the radial direction of each O-ring portion 40) is made larger than the width L2 of the non-connecting portion 40a. However, the connecting portion 40b has a shape in which some arc-shaped portions of two adjacent O-ring portions 40 overlap each other in a front view, and the lateral width L1 is smaller than a value obtained by doubling the width L2. Such a configuration is advantageous for reducing the center-to-center distance L3 of the plurality of O-ring portions 40. That is, compared with the case where two O-rings having the same size as the O-ring portion 40 are arranged, the distance between the centers can be made smaller in the present embodiment. This is preferable for reducing the arrangement pitch of the heat transfer tubes 1.

  The hole portion 48 of the O-ring portion 40 has a size corresponding to the outer diameter of the heat transfer tube 1, but is not formed in a perfect circle shape in the present embodiment. Specifically, as shown in FIG. 6, the curvature radius R1 of the inner surface of the connecting portion 40b of the O-ring portion 40 is larger than the curvature radius R2 of the inner surface of the non-connecting portion 40a. As a result, it is possible to make the lateral width L1 of the connecting portion 40b larger than the width L2, while avoiding as much as possible the location where the shape changes greatly on the inner surface of the O-ring portion 40. Preferably, the vertical width L4 of the connecting portion 40b is equal to or larger than the inner diameter D1 of each O-ring portion 40. As will be described later, the connecting portion 40b is a portion that is disposed between the heat transfer tubes 1 adjacent to each other and is in contact with the outer surface of the heat transfer tubes 1, so that the vertical width L4 is equal to or greater than the inner diameter D1. For example, the connecting portion 40b can be appropriately arranged so as not to be deficient over substantially the entire area between the heat transfer tubes 1.

  As shown in FIGS. 2 and 3, the seal member 4 is attached to the plurality of heat transfer tubes 1 so that each O-ring portion 40 is fitted on the end of each heat transfer tube 1. An end portion of each heat transfer tube 1 is inserted into a hole 23 provided in the side wall portion 20 c of the case 2 and drawn out of the case 2.

  In addition to the chamber 31 in which the opening 30 for hot water is formed, the header 3 includes a plurality of relatively short channels 32 connected to one end of the chamber 31, and the other ends of the channels 32. It has a connected opening 33. The opening 33 is a single opening formed so that the end portions of the plurality of heat transfer tubes 1, the seal member 4, and the spacer 5 can be collectively entered. Of the inner surface of the opening 33, the portion 33 a corresponding to the outer peripheral edge of the seal member 4 has the same shape as the contour of the outer peripheral edge of the seal member 4. It is comprised so that it may contact. In addition, a stepped portion 34 that abuts on one side of the seal member 4 is formed at the back of the opening 33 (to the right in FIGS. 2 and 3). The header 3 is attached to the side wall part 20c using the screw body 90 so as to press the packing 6 against the side wall part 20c of the case 2.

  The spacer 5 is for defining the relative positional relationship between the plurality of heat transfer tubes 1 and for positioning the seal member 4. As shown in FIG. 7, the spacer 5 is a combination of a pair of upper and lower pieces 50. The pair of pieces 50 are both resin molded products, and preferably have the same shape and size. The pair of pieces 50 have a plurality of semicircular recesses 51 that form through holes into which the plurality of heat transfer tubes 1 can be inserted when they are combined with each other. Further, the pair of pieces 50 also have a convex portion 52a and a concave portion 52b for positioning when they are combined, and an engaging protrusion 53a and an engaged portion 53b that can be engaged with each other. If such means are provided, the state in which the spacers 5 are attached to the plurality of heat transfer tubes 1 is appropriately maintained even before the spacers 5 are incorporated into the openings 33 of the header 3, and the assembly workability is improved. improves.

  As shown in FIG. 2, the spacer 5 is attached to the plurality of heat transfer tubes 1 such that each heat transfer tube 1 is sandwiched from above and below by a pair of pieces 50. As shown in FIG. 3, a part of the spacer 5 (a convex portion 51 a between the plurality of recesses 51 shown in FIG. 7) is interposed between the plurality of heat transfer tubes 1. Thus, the relative movement of the plurality of heat transfer tubes 1 in their arrangement direction is restricted. Of course, the relative movement of the plurality of heat transfer tubes 1 in the vertical direction is also restricted by the spacer 5. The spacer 5 is inserted into the opening 33 of the header 3, and the spacer 5 and the header 3 are positioned by this insertion.

  Each heat transfer tube 1 is provided with a convex portion 15 formed by flare processing. On the other hand, the inner surface of the spacer 5 is formed with a concave portion 55 for allowing the convex portion 15 to enter the inside. The positioning of the heat transfer tubes 1 and the spacers 5 is achieved by the engaging action of the concave portions 55 and the convex portions 15. One side surface 56 of the spacer 5 can abut on one side of the seal member 4 (one side opposite to the side on which the stepped portion 34 abuts). Thus, the seal member 4 is positioned in the longitudinal direction of the heat transfer tube 1.

  The spacer 5 is provided with a convex portion 57 that fits into the hole 23 provided in the side wall portion 20 c of the case 2. Due to the fitting action of the convex portion 57 and the hole portion 23, the spacer 5 can be positioned more accurately. As shown in FIG. 4, the hole 23 is formed as a single hole through which the plurality of heat transfer tubes 1 can be inserted. The same applies to the hole 60 formed in the sheet-like packing 6.

  The seal coupling structure C1 has the above-described configuration, but the other seal coupling structure C2 has the same basic configuration. In the drawings, the elements corresponding to each other of the seal coupling structures C1 and C2 are denoted by the same reference numerals, and redundant description is omitted.

  Next, the operation of the heat exchanger HE provided with the seal coupling structures C1 and C2 having the above-described configuration will be described.

  First, as described above, the opening 33 of the header 3 is formed as a single opening that allows the plurality of heat transfer tubes 1, the seal member 4, and the spacer 5 to enter the inside at once. In addition, a plurality of openings for individually entering the plurality of heat transfer tubes 1 and the O-rings externally fitted thereto are not provided at appropriate intervals. For this reason, according to the present embodiment, it is possible to reduce the arrangement pitch P of the plurality of heat transfer tubes 1 without being subjected to restrictions imposed when a plurality of openings are provided at appropriate intervals (FIG. 3). See). In the heat exchanger HE, there is a case where it is desired to reduce the arrangement pitch P of the plurality of heat transfer tubes 1 for the purpose of increasing the heat exchange efficiency. Suitable for. As shown in FIG. 3, the header 3 is provided with a plurality of flow paths 32 corresponding to the plurality of heat transfer tubes 1, but each flow path 32 enters the heat transfer tubes 1 and the O-ring portion 40. It is not for making it small, and a small diameter is sufficient. Therefore, there is no problem that the effect of reducing the arrangement pitch P cannot be obtained due to the provision of the plurality of flow paths 32.

  As described with reference to FIG. 5, the seal member 4 has a configuration in which a plurality of O-ring portions 40 are connected, but the lateral width L1 of the connecting portion 40b is larger than the width L2. By being made relatively small, the center-to-center distance L3 between the two O-ring portions 40 adjacent to each other can be made relatively short. Therefore, the arrangement pitch P of the plurality of heat transfer tubes 1 can be further reduced by this.

The non-connecting portion 40a of the seal member 4 is compressed between the outer surface of each heat transfer tube 1 and the inner surface of the opening 33 of the header 3, but the connecting portion 40b is between the two heat transfer tubes 1 adjacent to each other. In position, it is compressed by these two heat transfer tubes 1. On the other hand, since the lateral width L1 of the connecting portion 40b is larger than the width L2 of the non-connecting portion 40a, the amount of compression of the connecting portion 40b is increased to make the connecting portion 40b adjacent to each other. It is possible to press the outer surfaces of the heat transfer tubes 1 with a sufficiently large force. Therefore, there is no problem that the location where the connecting portion 40b abuts on the outer peripheral surface of each heat transfer tube 1 is a location where the sealing performance is inferior to other locations.

  When assembling the seal coupling structures C1 and C2 of this embodiment, since the seal member 4 is configured as a single seal member, compared to a case where a plurality of O-rings are externally fitted to the heat transfer tube 1, The mounting work becomes easy. In addition, since the plurality of heat transfer tubes 1 and the seal member 4 may be inserted into the opening 33 of the header 3 at once, the operation is also easy. Therefore, the workability when assembling the seal coupling structures C1 and C2 is good, and the manufacturing cost of the heat exchanger HE can be reduced. In addition, the spacer 5 is preferable for stably supporting the plurality of heat transfer tubes 1 in order to perform the relative positioning and fixing of the plurality of heat transfer tubes 1. Further, since the spacer 5 is also used as a positioning means for the seal member 4, the number of parts can be reduced and the manufacturing cost can be further reduced as compared with the case where another member dedicated to the spacer 5 is used. . Further, the spacer 5 together with the sheet-like packing 6 also exerts a role of appropriately preventing combustion gas from leaking out from the hole 23 of the case 2.

  8 to 13 show another embodiment of the present invention. In these embodiments, elements that are the same as or similar to those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the embodiment shown in FIGS. 8 to 11, the positioning member 7 having a plurality of comb-like protrusions 70 is used. The header 3 is formed with a holding portion 38 that can hold the positioning member 7. The holding part 38 has a narrow hole 38a having an upper opening shape, and the positioning member 7 can be inserted into the hole 38a from above. The holding portion 38 is formed with an opening 33 into which a plurality of heat transfer tubes 1 and the seal member 4 can be inserted at a time. A locking projection 38b is also provided for preventing the positioning member 7 from coming off upward. As clearly shown in FIG. 11, the plurality of protrusions 70 of the positioning member 7 are positioned between the plurality of heat transfer tubes 1 and can contact the plurality of heat transfer tubes 1. Further, as shown in FIG. 9, the plurality of protrusions 70 can contact one end of the spacer 5A.

  According to this embodiment, the position restriction of the plurality of heat transfer tubes 1 and the position restriction of the spacer 5 can be appropriately achieved by the positioning member 7. In the present embodiment, for example, even if the spacer 5A is provided in a state in which the spacer 5A can be somewhat displaced with respect to the header 3, the positioning member 7 can accurately prevent the plurality of heat transfer tubes 1 from moving in the horizontal direction or the like. Is done. In addition, as shown in FIG. 10, the spacer 5A used in this embodiment is not a vertically divided form, but a form in which a plurality of cylindrical portions are connected in series (a form similar to the seal member 4). It is said that. The spacer referred to in the present invention can also be configured as such a single member. When the spacer 5A is attached to the heat transfer tube 1, the spacer 5A is fitted on the heat transfer tube 1 in advance, and then the heat transfer tube 1 is flared to form a convex portion 15 as shown in FIG. That's fine. A concave portion 55 is formed in advance on the inner surface of the spacer 5 </ b> A, and the spacer 5 </ b> A can be positioned and fixed with respect to the heat transfer tube 1 by the action of the convex portion 15 engaging with the concave portion 55.

  In the embodiment shown in FIG. 12, the heat transfer tube 1 is pre-flared to form a convex portion 15, and the spacer 5 </ b> B is externally fitted to the heat transfer tube 1 from the front end side. . One end of the spacer 5 </ b> B can be brought into contact with the comb-shaped protrusion 70 of the positioning member 7. Even with such a configuration, the spacer 5B can be positioned using the positioning member 7 well.

  The seal member 4A shown in FIG. 13A has a configuration in which two O-ring portions 40 are connected. In the case of targeting two pipe bodies, this seal member 4A can be suitably used. As will be understood from the present embodiment, the specific number of the O-ring portions of the seal member may be plural, and is not limited.

  In the seal member 4B shown in FIG. 13B, a plurality of O-ring portions 40 are connected not only in the horizontal direction but also in the vertical direction. Although the figure shows two horizontal rows, the number of rows can be further increased. As in the present embodiment, in the present invention, the direction in which the plurality of O-ring portions are arranged is not limited to one direction, and may be configured in two vertical and horizontal directions.

  In the sealing member 4C shown in FIG. 13C, a plurality of O-ring portions 40 are connected in a staggered arrangement. As understood from this embodiment, in the present invention, the plurality of O-ring portions 40 do not necessarily have to be arranged in a straight line.

  The present invention is not limited to the contents of the above-described embodiment. The specific structure of each part of the seal connection structure of a plurality of tubular bodies according to the present invention, the heat exchanger provided with the structure, and the seal member can be changed in various ways.

  The seal member according to the present invention is only required to have a configuration in which a plurality of O-ring portions for externally fitting to each of a plurality of tubular bodies are connected in series, and the plurality of O-ring portions described above. You may connect in aspects other than embodiment. What is necessary is just to change suitably the specific size of each O-ring part according to the size of the tubular body used as application object.

  The multi-tube seal connection structure according to the present invention can be used for applications other than the connection structure between a heat transfer tube and a header of a heat exchanger. Therefore, the tubular body referred to in the present invention is not limited to the heat transfer tube, and various tubular bodies can be applied. The tube body is not limited to a liquid that circulates inside, but may be a gas that circulates, for example. As the connection target member in the present invention, various members other than the header can be applied.

HE heat exchangers C1, C2 Multi-tube seal connection structure 1 Heat transfer tube (tube)
3 Header (member to be connected)
4, 4A-4C Seal member 5, 5A, 5B Spacer 33 Opening (of the member to be connected)
40 O-ring part 40a Non-connected part (O-ring part)
40b Connecting part (O-ring part)

Claims (5)

Multiple tubes,
A connection target member having an opening for allowing the plurality of tubes to enter; and
A sealing member for sealing a gap between the inner surface of the opening and the outer surface of the plurality of tubular bodies , and having a configuration in which a plurality of O-ring portions that are externally fitted to the plurality of tubular bodies are connected in series. When,
A multi-tubular seal connection structure comprising:
The opening of the connection target member is configured as a single opening capable of allowing the plurality of tube bodies and the seal member to collectively enter the interior ,
The plurality of O-ring portions are integrally formed so as to be aligned on the same plane, and adjacent O-ring portions are formed with connecting portions in which the mutually approaching portions are integrally connected. ,
The connecting portion is provided so as to be compressed between the plurality of tubular bodies, and the portions other than the connecting portion among the plurality of O-ring portions are the outer surfaces of the plurality of tubular bodies and the openings. Provided to be compressed between the inner surface of the part,
The plurality of O-ring portions are configured such that, in a natural state where the plurality of O-ring portions are not attached to the plurality of pipe bodies, the connecting portion has a radial width larger than a portion other than the connecting portion. A multi-tube seal connection structure. In a natural state where the plurality of O-ring portions are not attached to the plurality of pipe bodies, the inner surface of the connecting portion has an arc shape having a larger radius of curvature than the radius of curvature of the inner surface of the portion other than the connecting portion. The multi-tubular seal connection structure according to claim 1. A spacer attached to the plurality of tubes so as to regulate relative displacement between the plurality of tubes;
The spacer, each of the one side of the plurality of O-ring portion in contact with the sealing connection structure of multi-tube body according to claim 1 or 2. A plurality of heat transfer tubes;
A header connected to one end of the plurality of heat transfer tubes, and for causing the fluid to flow into or out of the plurality of heat transfer tubes;
A heat exchanger comprising:
A heat exchanger, wherein the plurality of heat transfer tubes and the header are connected with each other by using the multi-tube seal connection structure according to any one of claims 1 to 3. In the case of connecting a plurality of tubular bodies and a connection target member having an opening through which the plurality of tubular bodies can be collectively entered, the inner surface of the opening and the outer surface of the plurality of tubular bodies A seal member used to seal the gap,
A plurality of O-ring portions inserted into the openings and externally fitted to the plurality of tubular bodies are connected in series;
The plurality of O-ring portions are integrally formed so as to be aligned on the same plane, and adjacent O-ring portions are formed with connecting portions in which the mutually approaching portions are integrally connected. ,
The connecting portion is compressible between the plurality of tube bodies, and among the plurality of O-ring portions, portions other than the connecting portions are an outer surface of the plurality of tube bodies and an inner surface of the opening portion. And can be compressed between
The plurality of O-ring portions are configured such that, in a natural state where the plurality of O-ring portions are not attached to the plurality of pipe bodies, the connecting portion has a radial width larger than a portion other than the connecting portion. A sealing member.

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