JP7041295B2 - Pipe fittings and air conditioning system - Google Patents

Description

The present invention relates to a pipe joint and an air conditioning system using the pipe joint.

In recent years, pipes that need to insulate the outer surface of the pipe, for example, drain pipes in air conditioning systems, have heat-insulated pipes in which a coating layer made of foamable resin is formed on the outer circumference of the pipe body in order to simplify the construction work. It is designed to be used as a drain pipe. Further, as a pipe joint for connecting heat-insulated pipes, a pipe joint made of synthetic resin that has been heat-insulated from the surrounding atmosphere has been used. As such a pipe joint, the one described in Patent Document 1 is known.

This pipe joint is provided with a joint body having a receiving port for inserting an insertion portion (hereinafter referred to as an outlet) of a heat insulating pipe to be connected and a body portion for communicating between the receiving ports, and is a heat insulating member formed as a separate member. Is mounted inside the joint body, and an air layer is formed between the outer surface of the mounted heat insulating member and the inner surface of the body. Further, in the heat insulating member mounted in the joint body, substantially the entire outer surface is formed as a recess in order to form an air layer between the heat insulating member and the inner surface of the body portion.

Japanese Unexamined Patent Publication No. 2016-23667

However, in the above-mentioned conventional pipe joint, one end of the heat insulating member is forcibly inserted into the joint body while being deformed by reducing the diameter, so that the concave portion on the outer surface of the heat insulating member corresponds to the predetermined inner surface of the body. It was necessary to adjust the position to. In addition, it was necessary to attach both ends of the recesses of the heat insulating member to the inner surface of the joint body in a watertight manner. As described above, the conventional one requires the work of forcibly inserting the heat insulating member into the joint body and the work of attaching both ends of the recesses of the heat insulating member to the inner surface of the joint body with high watertightness and accuracy, which is difficult. there were. For this reason, it has been required to further facilitate the assembly of the pipe joint itself in order to facilitate the construction work of the pipe using the heat insulating pipe.

The present invention has been made in view of the problems in the prior art, and provides a pipe fitting that facilitates the pipe construction work as a whole by facilitating the assembly work of the pipe joint itself having a heat insulating function. With the goal. Another object of the present invention is to provide an air conditioning system using such a pipe joint.

[1] The pipe joint that solves the above problems is a pipe joint for connecting heat insulating pipes having a coating layer made of foamable resin formed on the outer periphery of a pipe body made of hard resin, and should be connected. A joint body having a plurality of sockets for inserting and adhering outlets of a heat insulating pipe and a body portion connecting between the plurality of sockets, and covering the outer surface of the body portion from the outside of the joint body. The joint body and the cover member are configured to form a closed air layer between the inner surface of the cover member and the outer surface of the body portion. There is.

According to the pipe joint having such a configuration, by assembling the cover member from the outside of the joint body to the joint body to which the heat insulating pipe is connected, a heat insulating layer composed of a closed air layer is formed on the outer surface of the body of the joint body. Since it is formed, the assembly work of the pipe joint can be facilitated, and the pipe construction work using the heat insulating pipe can be facilitated as a whole.

[2] Further, it is preferable that the cover member is adhered to the outer surface of the socket with an adhesive so as to maintain the airtightness of the closed air layer.
According to such a configuration, the cover member can be easily and airtightly attached while forming a closed air layer on the outer surface of the body of the joint body, and the closed air layer can be easily formed.

[3] Further, the joint body is formed in a tubular shape having an outer diameter smaller than the outer diameter of the socket so that the outer surface of the body portion becomes a concave portion between the plurality of sockets, and the cover. It is preferable that the member is adhered to the outer surface of the receiving port so as to form the concave portion with the closed air layer.

According to such a configuration, by attaching the cover member, the concave portion on the outer surface of the body portion can be easily formed as a closed air layer. Further, since the cover member can also have a flat shape, the cover member can be simplified.

[4] Further, in the joint body, a heat insulating plate material made of an independent foamable resin is adhered to a wall portion forming the bottom of the mouth of the receiving port, and the surface of the heat insulating plate material is a spigot in a heat insulating pipe to be connected. It is preferable that the contact surface is formed.

According to such a configuration, since the heat insulating plate material made of an independent foamable resin is attached to the contact surface of the receiving port, the cooling of the joint body by the connected heat insulating pipe is relaxed, and dew condensation occurs on the outer surface of the joint body. Is relaxed. Further, since the heat insulating plate material is formed of the independent foamable resin, the infiltration of liquid such as water into the heat insulating plate material is avoided, and the cooling of the joint body is further relaxed. In addition, when the heat insulating plate material, the joint body, and the coating layer of the heat insulating pipe are all made of polyvinyl chloride resin material, they are mutually dissolved and swollen by the adhesive and fused, so that the watertightness performance is improved. improves.

[5] Further, it is preferable that the cover member is configured by adhering a plurality of divided covers.
According to such a configuration, by appropriately dividing the cover member, the cover member can be easily manufactured and the cover member can be easily attached.

[6] Further, the cover member is divided by two divided covers, a first divided cover and a second divided cover, which are divided by using a plane including a pipe shaft of a heat insulating pipe connected to the receiving port as a divided surface. It is preferable that the first divided cover and the second divided cover are bonded to each other at both divided end faces forming the divided surface.

According to such a configuration, the first split cover and the second split cover can have a symmetrical structure, and the flat surface including the pipe shaft of the heat insulating pipe connected to the socket can be formed with the split cover. Since the split surface of the mold to be molded can be used, the split cover can be easily manufactured.

[7] Further, in the cover member, a groove extending in the longitudinal direction of the divided end face is formed on the divided end surface of one of the divided first divided covers, and the divided end surface of the other second divided cover is said to be the same. A ridge portion to be fitted to the groove portion is formed, and the first split cover and the second split cover are combined so that the ridge portion fits into the groove portion, and the combined ridge portion is formed. It is preferable that an adhesive flow path is formed between the tip surface and the bottom surface of the groove to allow the adhesive to flow.

According to such a configuration, the adhesive can be distributed to the adhesive flow path in the groove portion, whereby the two divided covers to be bonded can be efficiently bonded. In particular, when the two divided covers to be bonded are made of the same material, for example, polyvinyl chloride, they can be bonded using a solvent-type adhesive (soluble adhesive). Further, as a result, the adhesive surfaces of both split covers can be melted and swollen in the groove portion, and the adhesive retention between the split covers (adhesion without rattling) can be ensured. Airtightness can be easily ensured.

[8] Further, the adhesive flow path is independent for each of the adhesive portions in the adhesive portions between the plurality of divided end faces formed by combining the first divided cover and the second divided cover. The adhesive flow path formed in the above-mentioned independently is opened to the outside from one end surface in the pipe axial direction of the cover member to be adhered to the outer surface of the receiving port. It is preferable that the other end is communicated with the adhesive portion between the inner surface of the cover member and the outer surface of the receiving port at the other end portion of the cover member in the pipe axis direction.

According to such a configuration, two split covers are combined so as to cover the outer surface of the body of the joint body, and in this combined state, the adhesive injector is inserted into the opening of the adhesive flow path that opens to the outside. When the adhesive is injected by inserting the needle-shaped injection part of the adhesive, the adhesive is adhered while avoiding the adhesive sticking to the operator's hand or the adhesive leaking to the outside of the adhesive flow path. It can be distributed in the agent flow path. This makes it possible to facilitate the work of injecting the adhesive.

[9] Further, the joint body is formed with an annular recess that is wider than the depth on the outer surface of the socket to form an adhesive portion between the cover member and the outer surface of the socket. In the cover member, the end portion in the pipe axial direction constitutes an adhesive portion with the outer surface of the receiving port, and the end portion of the cover member in the pipe axial direction has an end edge from the annular recess to the receiving port. A gap is formed between the edge of the cover member and the edge of the annular recess, and the gap is formed by surface tension so as not to squeeze out to the outer surface on the inlet side of the cover member. It is preferable that the adhesive is formed so as to prevent the outflow of the adhesive inside and to allow the needle-shaped injection portion of the adhesive injector to be inserted into the annular recess from the outside.

According to such a configuration, the operator assembling the pipe joint can inject the adhesive into the annular recess through the gap formed between the edge of the cover member and the edge of the annular recess. The time for injecting the adhesive into the annular recess can be shortened. Further, the adhesive injected into the annular recess leaks to the outer surface on the inlet side of the receiving port from the gap formed between the edge of the cover member and the edge of the annular recess due to the surface tension of the adhesive. Is suppressed.

[10] Further, in the joint body and the cover member, the closed air layer is formed between the inner surface of the cover member and the outer surface of the body portion, and the inner surface of the cover member and the socket. It is preferably configured to extend between the outer surface.

According to such a configuration, the contact portion between the cover member and the joint body can be located at a position away from the body portion, so that the cooling action from the body portion on the vicinity of the adhesive portion of the cover member can be alleviated. .. This makes it possible to further alleviate dew condensation in the vicinity of the bonded portion of the cover member.

[11] Further, the joint body has a first engaging portion for positioning that protrudes outward in the radial direction on the outer surface of the receiving port, and the cover member engages with the first engaging portion. It has a second engaging portion for positioning that protrudes inward in the radial direction, and the adhesive portion between the cover member and the outer surface of the socket is the end portion in the pipe axial direction on the inner surface of the cover member. It is preferable that the one formed between the above-mentioned receiving port and the outer surface of the receiving port is provided.

According to such a configuration, the contact portion between the joint main body and the cover member, such as the positioning portion of the cover member with respect to the joint main body and the adhesive portion of the cover member, is passed through the wall body of the receiving port in contact with the closed air layer. Since the position can be set away from the portion, the cooling of the cover member can be alleviated, and the dew condensation can be further alleviated.

[12] Further, the joint body has a first engaging portion for positioning that protrudes outward in the radial direction on the outer surface of the receiving port, and the cover member engages with the first engaging portion. It has a matching second engaging portion for positioning that protrudes inward in the radial direction, and the adhesive portion between the cover member and the outer surface of the socket is a radial outer side formed on the mouth edge of the socket. The flange-shaped protrusion is formed between the flange-shaped protrusion protruding from the surface and the end surface of the cover member, and the flange-shaped protrusion has a connecting protrusion and a connecting hole for opening one end of the adhesive flow path to the outside. Is preferably provided.

According to such a configuration, the contact portion between the joint main body and the cover member, such as the positioning portion of the cover member with respect to the joint main body and the adhesive portion of the cover member, can be collected at the end near the mouth edge of the receiving port. Therefore, the contact portion between the joint body and the cover member can be located at a position away from the body portion via the wall body of the receiving port in contact with the closed air layer, so that the cooling of the cover member can be further relaxed and dew condensation can occur. Can be further alleviated.

[13] Further, the concave portion has a stepped surface in a direction intersecting the pipe axis at a boundary portion with the outer surface of the receiving port, and the cover member has the stepped surface from the radial outside with respect to the stepped surface. It is preferable to have a semi-cracked brim-shaped positioning protrusion that is inserted in a fitted state toward the inside of the concave portion and is inward in the radial direction.

According to such a configuration, the half-split brim-shaped positioning protrusion is fitted toward the inside of the concave portion on the stepped surface, so that the mounting position of the cover member can be properly set to a predetermined position with a relatively simple configuration. It can be regulated and the airtightness of the closed air layer can be improved.

[14] Further, it is preferable that the cover member is configured to form a gap between the tip surface of the positioning protrusion and the outer surface of the body.
According to such a configuration, it is possible to avoid direct contact between the tip surface of the positioning protrusion and the outer surface of the body portion of the joint body. As a result, the heat transfer action between the cover member and the low-temperature fluid circulating in the joint body can be reduced, the cooling of the cover member can be reduced, and the dew condensation on the outer surface of the cover member can be alleviated.

[15] Further, the joint body is formed of a transparent resin material, and in the cover member, the position of the end surface of the cover member fixed to the outer surface of the socket in the pipe axis direction is the contact surface of the socket. It is preferable that it is formed so as to be equivalent to the position of.

According to such a configuration, the adhesive portion between the inner surface of the socket and the outer surface of the heat insulating pipe is not covered by the cover member, and the joint body is formed of the transparent member, so that the inner surface of the socket and the heat insulating portion are insulated. It is possible to easily determine whether or not the state of adhesion between the outlet of the pipe and the outer surface is good.

[16] Further, the air conditioning system that solves the above problems includes a drain pipe made of a heat insulating pipe and the pipe joint that connects the drain pipes to each other.
According to the air conditioning system having such a configuration, since the pipe joint is used as the pipe joint of the drain pipe, the construction work of the drain pipe can be facilitated, and the construction work of the air conditioning system can be further facilitated. ..

[17] Further, in such an air conditioning system, the drain pipe has a pipe body made of a rigid resin and a coating layer made of a closed cell foam resin material that covers the outer surface of the pipe body. The coating layer is composed of a non-foaming hard surface layer portion formed on the outer surface and a foamed inner layer portion on the inner peripheral side of the surface layer portion. It is preferable that the portion and the inner layer portion are integrally formed.

According to such a configuration, since the coating layer is formed of a closed-cell foamed resin material, moisture is not absorbed by the coating layer, and high heat insulating performance can be maintained. Further, since the outer surface of the coating layer is formed on a non-foamed hard surface layer portion, it is not easily scratched and has a good appearance.

[18] Further, in such an air conditioning system, the outer diameter of the outlet in the drain pipe and the inner diameter of the socket in the pipe joint are formed in a correlation in which the outlet is press-fitted into the socket. It is preferable that the outlet is adhered to the socket with an adhesive in a state of being press-fitted into the socket.

According to such a configuration, since the outlet of the drain pipe is adhered to the receptacle with an adhesive in a state of being press-fitted into the socket, it is easy to avoid water leakage. In particular, when the foamed resin material constituting the coating layer of the drain pipe and the synthetic resin material constituting the joint body constituting the socket are polyvinyl chloride, the synthetic resin forming the coating layer and the joint body in the socket are used. Since the constituent synthetic resin is dissolved and swollen by the adhesive and fused, water leakage is more reliably avoided.

According to the main pipe joint, the assembly work of the pipe joint is facilitated, and the piping construction work is facilitated as a whole.

It is an external view of the pipe joint which concerns on Embodiment 1, (a) is a front view, (b) is a right side view, (c) is a left side view, (d) is a plan view. An exploded perspective view of the pipe joint. FIG. 1 is a cross-sectional view taken along the line CS1-CS1 in FIG. FIG. 2 is a cross-sectional view taken along the line CS2-CS2 in FIG. External perspective view of the heat insulating pipe connected to the pipe joint. Front vertical sectional view of the joint body in the same pipe joint. FIG. 6 is an enlarged view of part A in FIG. It is a drawing of the 1st division cover in the pipe joint, (a) is a front view, (b) is a left side view, (c) is a plan view, (d) is a rear view, (e) is this figure (e). FIG. 3 is a cross-sectional view taken along the line CS3-CS3 in a). It is a drawing of the 2nd division cover in the pipe joint, (a) is a front view, (b) is a left side view, (c) is a plan view, (d) is a rear view, (e) is this figure (e). The cross-sectional view of CS4-CS4 in d). 1 is a partially enlarged view, in which (a) is an enlarged view of part B, (b) is an enlarged view of part C, and (c) is an enlarged view of part D. It is an enlarged view of the adhesive part formed on the outer surface of the socket in the pipe joint, and is the figure which enlarged and upside down the E part of FIG. The front vertical sectional view of the pipe fitting which concerns on Embodiment 2. FIG. An exploded perspective view of the pipe joint. The front vertical sectional view of the pipe fitting which concerns on Embodiment 3. FIG. An exploded perspective view of the pipe joint. The front vertical sectional view of the pipe fitting which concerns on Embodiment 4. FIG. An exploded perspective view of the pipe joint. The front vertical sectional view of the pipe fitting which concerns on embodiment 5. An exploded perspective view of the pipe joint. The front vertical sectional view of the pipe fitting which concerns on Embodiment 6. An exploded perspective view of the pipe joint. The front vertical sectional view of the pipe fitting which concerns on Embodiment 7. An exploded perspective view of the pipe joint. It is an exploded perspective view of the pipe joint, and is the view seen from the right side in FIG. 23. FIG. 22 is a sectional view taken along line CS5-CS5 in FIG. FIG. 25 is a cross-sectional view taken along the line CS6-CS6 in FIG. The front vertical sectional view of the pipe fitting which concerns on Embodiment 8. An exploded perspective view of the pipe joint. It is an exploded perspective view of the pipe joint, and is the view seen from the right side in FIG. 28. FIG. 27 is a cross-sectional view taken along the line CS7-CS7 in FIG. FIG. 30 is a cross-sectional view taken along the line CS8-CS8 in FIG. An air conditioning system diagram as an application example of a main pipe joint.

Hereinafter, the pipe joint according to the embodiment of the present invention will be described. It should be noted that the present invention is not limited to the examples described below, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. To.

(Embodiment 1)
The pipe joint according to the first embodiment is in the middle of a pipe of a heat insulating pipe P having heat insulating performance, for example, a drain pipe of an air conditioning system, as shown in FIGS. 1 (a) to 1 (d) and FIG. It is a different diameter cheese 1 that connects drain pipes to each other. In the following description, the term "FIG. 1" means FIGS. 1 (a) to 1 (d).

As shown in FIGS. 1 to 4, the different diameter cheese 1 has a cover member 20 attached to the outside of the joint body 10. In the present specification, when the protruding direction of the branch receiving port 12 is upward, the different diameter cheese 1 has the front surface in the direction perpendicular to the pipe axis of the heat insulating pipe P to be connected. Further, in the description of the different diameter cheese 1, when referring to the vertical and horizontal directions, the direction with respect to the front surface is used.

As shown in FIG. 5, the heat insulating pipe P includes a pipe main body P1 and a covering layer P2 that covers the outer surface of the pipe main body P1. A rigid polyvinyl chloride-based resin material is used for the pipe body P1, and the coating layer P2 is formed of a closed-cell vinyl chloride-based foamed resin material.

There are several methods for forming the coating layer P2. For example, the selka process. The coating layer P2 adopting this selka process has a surface layer portion P21 forming a substantially non-foaming hard, smooth surface formed on the outer periphery, and a foamed inner layer portion P22 on the inner peripheral side of the surface layer portion P21. The surface layer portion P21 and the inner layer portion P22 are integrally formed.

Next, as shown in FIGS. 3 and 6, the joint body 10 of the different diameter cheese 1 is provided with a main receiving port 11 on the left and right, respectively, and is provided with a branch receiving port 12 extending upward from an intermediate position of the main receiving port 11. It is formed symmetrically. The heat insulating pipe P connected to the main receiving port 11 has a nominal diameter of 30, for example, and the heat insulating pipe P connected to the branch receiving port 12 has a nominal diameter of 25, for example. Further, as shown in FIG. 3, the different diameter cheese 1 includes a body portion 13 that connects the two main receiving ports 11 and the branch receiving ports 12 to each other. The main receiving port 11 and the branch receiving port 12 are portions in the heat insulating pipe P into which the outlet is inserted.

Further, as shown in FIGS. 3 and 6, stepped wall portions are formed in the bottom portions 11a and 12a of the main receiving port 11 and the branch receiving port 12, and the heat insulating pipe P is formed in the center of the wall portions. A hole having the same diameter as the inner diameter is opened. The hole opened in the wall portion leads to the hole formed inside the body portion 13. Further, the heat insulating plate material 14 is adhered to the wall portion formed in the stepped shape, and the surface of the heat insulating plate material 14 forms the contact surfaces 11b and 12b of the end face of the outlet in the heat insulating pipe P.

The body portion 13 is a tubular member having holes inside the mouth bottom portions 11a and 12a of the main receiving port 11 and the branch receiving port 12, and the hole portion formed in the body portion 13 is the mouth bottom portion 11a. , 12a forms a communication passage 15 that communicates with each other. The inner diameter of the communication passage 15 is formed to be the same as the inner diameter of the heat insulating pipe P, and is configured so that a step does not occur between the inner diameter of the heat insulating pipe P connected to each receiving port. The holes forming the communication passage 15 are communicated in a T shape when viewed from the front.

As described above, the body portion 13 is configured to have a communication passage 15 by a tubular wall body having a substantially constant wall thickness. Therefore, the outer diameter of the tubular body portion 13 is formed to be smaller than the outer diameter of the adjacent receiving port. Therefore, stepped surfaces 16 and 17 in the direction intersecting the pipe axis of the heat insulating pipe P to be connected are formed at the boundary between the outer surface of the body portion 13 and the outer surface of each receiving port, and extend between the receiving ports. The outer surface of the existing body portion 13 is formed in a concave portion.

As shown in FIGS. 3 and 6, the main receiving port 11 and the branch receiving port 12 are tapered toward the bottom portions 11a and 12a so as to narrow and fit the outlet in the heat insulating pipe P to be inserted. It forms a hole in the shape, and is formed so that the hole diameter at the center of the taper is equal to the outer diameter of the outlet in the heat insulating pipe P. The main receiving port 11 and the branch receiving port 12 are also formed in a tapered shape whose outer shape is reduced in diameter toward the body portion like the hole portion, and the wall thickness between the inlet and the bottom portions 11a and 12a is formed. Is formed almost constantly. Since it is formed in this way, when the outlet in the heat insulating pipe P whose outer surface is coated with an adhesive is inserted into the main socket 11 or the branch socket 12, the end face of the outlet is the contact surface 11b, 12b. It is necessary to press fit until it comes into contact with.

Both the joint body 10 and the heat insulating pipe P are made of a polyvinyl chloride resin material. As a result, the outlets in the heat insulating pipe P press-fitted into the main receiving port 11 and the branch receiving port 12 are made of the main receiving port 11 and the branch receiving port 12 by using a solvent type adhesive (soluble adhesive). Adhesion is performed using melting and swelling with the inner surface as the adhesive surface. Further, by performing such adhesion, the watertightness of the adhesive portion between the main receiving port 11 and the inner surface of the branch receiving port 12 with the outlet of the heat insulating pipe P, and the adhesive holding property of the outlet (main receiving port 11). And the heat insulating pipe P is adhered without rattling at the branch receiving port 12).

As shown in FIG. 7, in the main receiving port 11 and the branch receiving port 12, an annular recess 18 that is wider than the depth is formed in the vicinity of the stepped surfaces 16 and 17 on the outer surface. The annular recess 18 is an injection portion for injecting an adhesive when adhering the end portion of the heat insulating pipe P to be connected in the cover member 20 in the pipe axial direction to the outer surface of the receiving port, and the adhesive is applied to the entire circumference of the receiving port. It is configured so that it can be distributed to. The annular recess 18 forms an adhesive portion that adheres the cover member 20 to the outer surface of the socket with an adhesive.

As shown in FIGS. 1 and 3, the cover member 20 has a shape in which a half-split cylindrical portion is joined in a T shape. Further, as shown in FIGS. 3 and 4, the cover member 20 is adhered to each end of the T-shaped pipe in the axial direction at the portion of the annular recess 18 on the outer surface of the main receiving port 11 and the branch receiving port 12. It is attached by being bonded with an agent. As a result, the cover member 20 forms a closed air layer 50 between the inner surface 21 of the cover member 20 and the outer surface 13a of the body portion 13, and covers the outside of the body portion 13.

As shown in FIGS. 1 and 2, the cover member 20 is divided into two parts in the front-rear direction in a plane including the pipe axis of the heat insulating pipe P to be connected to the receiving port. That is, the cover member 20 is a cover divided into two in the front and rear, and is composed of a first divided cover 30 located on the back side and a second divided cover 40 located on the front side.

As shown in FIGS. 8 (a) to 8 (e), the first divided cover 30 is a divided surface with the second divided cover 40, and when assembled as the cover member 20, the first divided cover 30 and the second divided cover 40 are attached. A groove portion 32 having a thickness corresponding to about 1/3 of the wall thickness of the divided end surface 31 is formed on the divided end surface 31 forming the adhesive surface of the above.

As shown in FIG. 8A, the divided end face 31 has a lower straight first end face 31a, an inverted L-shaped second end face 31b on the upper left, and an L-shaped third end face on the upper right. It has 31c, and a groove portion 32 is formed on each end face. As shown in the partially enlarged view in FIG. 4, the groove portion 32 internally fits the ridge portion 42 formed on the divided end surface 41 of the second divided cover 40, which will be described later. A gap is formed between the bottom surface of the groove portion 32 and the tip surface of the ridge portion 42. This gap forms an adhesive flow path 22 through which an adhesive flows when the first divided cover 30 and the second divided cover 40 are adhered to each other.

As can be seen from FIGS. 3 and 8 (a), the groove portion 32 formed in the linear first end surface 31a opens on the right end surface of the first division cover 30, and does not open on the left end surface, but on the left side. A branch path that opens into the annular recess 18 of the main receiving port 11 is formed in the vicinity of the end face. The groove portion 32 formed in the inverted L-shaped second end surface 31b opens in the left end surface of the first division cover 30, does not open in the upper end surface, and is an annular recess of the branch receiving port 12 in the vicinity of the upper end surface. A branch road opening to 18 is formed. The groove portion 32 formed in the L-shaped third end surface 31c opens in the upper end surface of the first division cover 30, does not open in the right end surface, and is an annular recess 18 of the branch receiving port 12 in the vicinity of the right end surface. A branch road is formed.

On the other hand, the second split cover 40 combined with the first split cover 30 is formed symmetrically with the first split cover 30 except that the ridge portion 42 is formed corresponding to the groove portion 32. That is, as shown in FIGS. 9 (a) to 9 (e), it is a divided surface with the first divided cover 30, and forms an adhesive surface with the first divided cover 30 when assembled as the cover member 20. The split end face 41 is formed with a ridge portion 42 having a thickness corresponding to about 1/3 of the wall thickness of the split end face 41.

The ridge portion 42 is fitted in the groove portion 32 as shown in FIG. Further, as shown in FIG. 9D, the split end face 41 is a fourth end face 41a, a fifth as end faces corresponding to the first end face 31a, the second end face 31b, and the third end face 31c of the first split cover 30. The end face 41b and the sixth end face 41c are formed.

Further, as shown in FIGS. 3 and 8A, the first division cover 30 is a heat insulating pipe P to be connected formed at a boundary between the outer surface 13a of the body portion 13 and the outer surface of each receiving port. It has a positioning protrusion 33 that is inserted into the recessed portion in a fitted state with respect to the stepped surfaces 16 and 17 in the direction intersecting the pipe axis. As can be clearly seen from FIG. 3, between the tip surface of the positioning protrusion 33 and the outer surface of the body portion 13, the tip surface of the positioning protrusion 33 does not directly touch the outer surface of the body portion 13. A gap is formed like this. Similarly, as can be seen from FIGS. 9A to 9E, the second split cover 40 corresponds to the positioning protrusion 33, and is fitted in the recessed portion with respect to the stepped surfaces 16 and 17. It has a positioning protrusion 43 to be inserted. Similar to the positioning protrusion 33, the positioning protrusion 43 is also between the tip surface of the positioning protrusion 43 and the outer surface of the body 13 so that the tip surface does not directly touch the outer surface of the body 13. A gap is formed.

In the first split cover 30 and the second split cover 40 configured as described above, the positioning protrusion 33 and the positioning protrusion 43 are inserted in a fitted state with respect to the inside of the stepped surfaces 16 and 17 toward the inside of the concave portion. As a result, the joint body 10 is assembled so as to be sandwiched from the front-rear direction. At this time, the ridge portion 42 of the second split cover 40 is fitted into the groove portion 32 of the first split cover 30. As a result, the butt-bonding surfaces of the first split cover 30 and the second split cover 40 are divided and formed at three locations, and an adhesive flow path 22 is formed in the groove 32 for each butt-bonding surface.

The adhesive flow path 22 formed for each butt adhesive surface is formed so that one end is released at the end surface of the cover member 20 and the other end opens in the annular recess 18. As can be seen from FIG. 3, specifically, the adhesive flow path 22 on the lower butt adhesive surface when viewed from the front opens at one end to the right end surface of the cover member 20, and the other end is the main receiving port 11 on the left side. It opens in the annular recess 18 of the above. Further, one end of the adhesive flow path 22 on the butt adhesive surface on the upper left side when viewed from the front opens to the left end surface of the cover member 20, and the other end opens to the annular recess 18 of the upper branch receiving port 12. Further, one end of the adhesive flow path 22 on the butt adhesive surface on the upper right side when viewed from the front opens to the upper end surface of the cover member 20, and the other end opens to the annular recess 18 of the main receiving port 11 on the right side.

The portions B, C, and D in FIG. 1 are shown in FIGS. 10 (a), (b), and (c) when enlarged, respectively, and the adhesive flow path 22 is located at the end face of the cover member 20. Shows an opening to open. The opening of the adhesive flow path 22 serves as an injection port when the adhesive is injected after the first division cover 30 and the second division cover 40 are combined. As the adhesive injector, one provided with a needle-shaped injection portion is used, and the tip of the injection portion is inserted into the adhesive flow path 22 from the opening.

Further, as shown in FIG. 11, when the cover member 20 is attached to the joint body 10, the positions X of the left and right and upper end faces of the cover member 20 in the pipe axis direction (in the case of FIG. 11, the cover member 20). The position X) of the right end surface of the above is configured to substantially coincide with the contact surfaces 11b and 12b of the receiving port (the contact surface 11b in the case of FIG. 11). Therefore, since each receiving port is made of a transparent member, it is configured so that the adhesive state between the outlet of the heat insulating pipe P inside and each receiving port can be sufficiently observed from the outside.

Further, as shown in FIG. 11, the edge of the cover member 20 fixed to the outer surface of the receiving port is configured so as not to protrude from the annular recess 18 to the outer surface located on the inlet side of the receiving port. There is. The corners of the edge of the cover member 20 and the edge of the annular recess 18 are cut so as to form a gap S between the edge of the cover member 20 in the pipe axis direction and the edge of the annular recess 18. Has been done. The gap S is configured to such that the outflow of the adhesive injected into the annular recess 18 due to surface tension can be avoided. The annular recess 18 is for adhering the end portion of the cover member 20 in the pipe axis direction to the outer surface of the receiving port, and since one end of the adhesive flow path 22 is open to the annular recess 18, it is adhered. The excess adhesive injected into the agent flow path 22 is configured to flow into the annular recess 18. However, the injection of the adhesive into the annular recess 18 is insufficient only by the injection of this method. Therefore, a gap S is provided. The gap S is for allowing the adhesive to be directly injected into the annular recess 18 by the adhesive injector 60 having a needle-shaped injection portion.

The cover member 20 is made of the same polyvinyl chloride resin material as the joint body 10. Therefore, the adhesion between the groove portion 32 of the divided end faces 31 and 41 and the ridge portion 42, and the adhesion between the cover member 20 and the outer surface of the receiving port of the joint body 10 in the annular recess 18 are each a solvent type adhesive (soluble adhesive). Adhesive using the dissolution and swelling of the adhesive surface is performed by the agent).

(Action)
Next, as an explanation of the operation of the main pipe joint, an assembling work of the different diameter cheese 1 and a connecting work of the heat insulating pipe P using the different diameter cheese 1 will be described.

The assembling work of the different diameter cheese 1 is performed as follows by using the joint body 10 and the cover member 20 prepared in advance.
First, the positioning protrusion 33 and the positioning protrusion 43 of the first split cover 30 and the second split cover 40 are inserted into the inside of the stepped surfaces 16 and 17 of the joint body 10 in a fitted state toward the inside of the concave portion, and both are inserted. Assemble both split covers so that the split cover sandwiches the joint body 10 from the front-rear direction. By this assembly, the ridge 42 of the second split cover 40 is fitted into the groove 32 of the first split cover 30 at each of the three split end face adhesive portions of the two split covers, and is adhered to each adhesive portion. The agent flow path 22 is formed. One end of the adhesive flow path 22 of each adhesive portion opens to the end surface of the cover member 20, and the other end opens to an annular recess 18 forming an adhesive portion between the end portion of the cover member and the outer surface of the receiving port. Independently formed. Further, in the adhesive portion between the end portion of the heat insulating pipe P in the cover member in the pipe axis direction and the outer surface of the receiving port, a gap S is formed between the end edge of the cover member 20 and the end edge of the annular recess 18. To.

Next, in the adhesive flow path 22 of each adhesive portion, an opening portion opened at the end surface of the heat insulating pipe P in the cover member 20 in the pipe axial direction by using an adhesive injector 60 provided with a needle-shaped injection portion. The soluble adhesive is injected into the adhesive flow path 22. The adhesive overflowing from the adhesive flow path 22 due to this injection flows out into the annular recess 18. However, since it takes too much time to inject the required adhesive into the annular recess 18 due to this outflow action, the adhesive is injected into each annular recess 18 from the gap S. Also in the case of this injection, the adhesive injector 60 described above is used. By performing this injection, the two split covers are bonded in each adhesive flow path 22, and the cover member 20 bonded in each annular recess 18 is bonded to the joint body 10. Each bond is a strong bond that utilizes the melting and swelling of the bonded surface.

The work of connecting the heat insulating pipe P to the pipe joint assembled as described above is performed as follows.
As the heat insulating pipe P, as described above, a pipe body P1 made of a hard polyvinyl chloride resin material provided with a coating layer P2 made of a closed-cell vinyl chloride foam resin material is used on the outer surface of the pipe body P1. To. Then, a soluble adhesive is applied to the outlet of the heat insulating pipe P to be connected, and the outlet of the heat insulating pipe P coated with the soluble adhesive is sequentially inserted into the main receiving port 11 and the branch receiving port 12. This insertion is performed by press-fitting in a throttle-fitted state so that the tip of the outlet in the heat insulating pipe P abuts on the contact surfaces 11b and 12b. When press-fitted in this way, a taper is formed in the receiving port, so that excess adhesive escapes to the inlet side. Further, since the outlet in the heat insulating pipe P is pushed in in the throttle-fitted state, it is set so as not to move until the bonding. As a result, the outlet in the heat insulating pipe P is adhered to a predetermined state when a predetermined time has elapsed. It should be noted that this adhesion is also a strong adhesion utilizing the melting and swelling of the adhesive surface. Further, in this adhesion, since the receiving port of the joint body 10 is transparent and the end portion of the cover member 20 is formed so as to coincide with the contact surfaces 11b and 12b, the difference in the heat insulating pipe P in each receiving port is formed. The adhesive state of the mouth can be easily observed.

(Effect of Embodiment 1)
Since the pipe joint according to the first embodiment is configured as described above, the following effects can be obtained.

(1) By assembling the cover member 20 from the outside of the joint body 10 to the joint body 10 to which the heat insulating pipe P is connected, a heat insulating layer made of a closed air layer 50 can be formed. Therefore, the assembly work of the pipe joint (in this case, different diameter cheese 1) can be facilitated, and the pipe construction work using the heat insulating pipe P can be facilitated as a whole.

(2) Since the cover member 20 is adhered to the outer surface of the main receiving port 11 or the branch receiving port 12 with an adhesive, the cover member 20 can be easily and airtightly attached, and the closed air layer 50 can be easily attached. Can be formed.

(3) By attaching the cover member 20, the concave portion on the outer surface of the body portion 13 can be easily formed as the closed air layer 50. Further, since the cover member 20 can also have a flat shape, the cover member 20 can be simplified.

(4) Since the heat insulating plate material 14 is attached to the contact surfaces 11b and 12b of the receiving port, the cooling of the joint body 10 by the heat insulating pipe P is alleviated, and the dew condensation on the outer surface of the joint body 10 is alleviated. Further, since the heat insulating plate 14 is made of the independent foamable resin, the infiltration of a fluid such as water into the heat insulating plate 14 is avoided, and the cooling of the joint body 10 is further relaxed.

(5) Since the cover member 20 is composed of two divided covers, a first divided cover 30 and a second divided cover 40, the cover member 20 can have a symmetrical structure, and the divided cover can be easily manufactured. become.

(6) The adhesive portion between the first divided cover 30 and the second divided cover 40 can be distributed with an adhesive by the adhesive flow path 22, and the two divided covers to be adhered are efficiently adhered to each other. be able to.

(7) Since the joint body 10, the cover member 20, and the heat insulating pipe P are all made of a polyvinyl chloride resin material, the adhesive portions are bonded to each other with a solvent type adhesive (soluble adhesive). can do. As a result, each adhesive surface can be melted and swollen, and adhesive retention (adhesion without rattling) can be ensured, so that the airtightness of the closed air layer can be easily ensured.

(8) After temporarily fixing the first split cover 30 and the second split cover 40 to the joint body 10 in a combined state from the outside, the adhesive flow path 22 and the annular recess 18 have a needle-shaped injection portion. Since the adhesive is injected by the adhesive injector 60, it is possible to reduce the leakage of the adhesive and efficiently inject the adhesive into a predetermined place.

(9) Further, the gap S between the edge of the cover member 20 and the edge of the annular recess 18 is such that the outflow of the adhesive in the annular recess 18 is prevented by surface tension, and the adhesive is used. The needle-shaped injection portion of the injector can be inserted into the annular recess from the outside. Therefore, the injection time can be shortened by directly injecting into the annular recess 18. It is suppressed that the adhesive injected into the annular recess 18 leaks from the gap S to the outer surface on the inlet side of the main receiving port 11.

(10) At the stepped surfaces 16 and 17 located at the boundary between the body portion 13 and the receiving port, the positioning protrusions 33 and 43 of the cover member 20 are fitted from the outside toward the inside of the concave portion on the outer surface of the body portion 13. By inserting the cover member 20 in the combined state, the cover member 20 can be properly attached to a predetermined position. Thereby, the airtightness of the closed air layer 50 can be improved.

(11) Since a gap is formed between the tip surfaces of the positioning protrusions 33 and 43 of the cover member 20 and the outer surface of the body portion 13, transmission between the cover member 20 and the low-temperature fluid flowing in the joint body 10 is formed. The thermal action can be reduced, the cooling of the cover member 20 can be reduced, and the dew condensation on the outer surface of the cover member 20 can be alleviated.

(12) Since the adhesive portion between the inner surface of the main receiving port 11 or the branch receiving port 12 and the outer surface of the heat insulating pipe P is not covered by the cover member 20, and the joint body 10 is formed of the transparent member, the receiving port. It is possible to easily determine whether or not the adhesive state between the inner surface of the pipe and the outer surface of the outlet of the heat insulating pipe P is good or bad.

(Common matters concerning Embodiment 2 to Embodiment 4)
Although other embodiments will be described below, the second to fourth embodiments are different from the first embodiment only in that they are related to the difference in the type of the pipe joint, but the other embodiments are different from the first embodiment. The configuration is based on the first form. Therefore, in order to simplify the description of these embodiments, in the drawings according to each embodiment, the same reference numerals are given to the portions corresponding to the first embodiment, and the description thereof will be omitted or simplified. The pipe joint according to the second to fourth embodiments described below has the same function and effect as the pipe joint according to the first embodiment.

(Embodiment 2)
12 and 13 show the pipe fitting according to the second embodiment. As shown in FIG. 12, the pipe joint according to the second embodiment is a socket 101 that linearly connects heat insulating pipes P having the same diameter. Further, in the case of this socket 101, the direction perpendicular to the pipe axis of the heat insulating pipe P to be connected is the front surface.

The joint body 10 of the socket 101 is different from the case of the first embodiment in that the main receiving port 11 having the same diameter is provided on the left and right sides and the branch receiving port 12 is not provided. Therefore, the body portion 13 has a linear tubular shape with a constant wall thickness, and its outer surface is formed in a concave portion.

As shown in FIG. 13, the cover member 20 is attached to the outside of the joint body 10 so that the concave portion on the outer surface of the body portion 13 is the closed air layer 50. The cover member 20 is adhered in the annular recess 18 formed on the outer surface of the main receiving port 11. As shown in FIG. 13, the cover member 20 is divided into front and rear parts, and the first divided cover 30 located on the back side and the second divided cover 40 located on the front side are divided on the divided surface. It is glued. Therefore, as shown in FIGS. 12 and 13, the adhesive surface in this case is a linear first end surface 31a and a fourth end surface 41a formed downward and a linear second end surface 31b formed upward. And the fifth end surface 41b.

The socket 101 according to this embodiment has the material of the joint body 10 and the cover member 20, the shape of the main receiving port 11, the structure of the adhesive portion for adhering the cover member 20 to the joint body 10, and the groove portion in the first split cover 30. The structure of 32, the structure of the protrusion 42 in the second split cover 40, and the like are based on the first embodiment. Therefore, the bonding structure and bonding method between the divided covers and the bonding structure and bonding method of the difference port of the heat insulating pipe P in the main receiving port 11 are also based on the first embodiment.

(Embodiment 3)
14 and 15 show the pipe fitting according to the third embodiment. As shown in FIG. 14, the pipe joint according to the third embodiment is a socket similar to that of the second embodiment, but is a different diameter socket 102 having different diameters of the main receiving ports 11 formed on the left and right. be. In this embodiment, the diameter of the heat insulating pipe P connected to the main receiving port 11 on the left side is small.

Therefore, as compared with the second embodiment, the body portion 13 is reduced in diameter from the right side to the left side, and the cover member 20 is also reduced in diameter from the right side to the left side so as to match this. It is configured. Other points are the same as those in the second embodiment.

(Embodiment 4)
16 and 17 show the pipe fitting according to the fourth embodiment. As shown in FIG. 16, the pipe fitting according to the fourth embodiment is an elbow 103 unlike the case of the second embodiment. In the case of this elbow 103, in a state where one main receiving port 11 is opened toward the right and the other main receiving port 11 is opened downward, the heat insulating pipe P to be connected The direction perpendicular to the pipe axis is the front.

The joint main body 10 has two main receiving ports 11 and a body portion 13 having a substantially L-shape when viewed from the front, which connects between the main receiving ports 11. The body portion 13 is formed so that the inner diameter side of the L-shaped bent portion viewed from the front is bent at a substantially right angle and the outer diameter side is arcuate. Further, the body portion 13 is bent in this way and has a substantially constant wall thickness, and its outer surface is formed in a concave portion.

As shown in FIG. 16, the cover member 20 is attached to the outside of the joint body 10 so that the concave portion on the outer surface of the body portion 13 that bends in a substantially L shape is the closed air layer 50. As shown in FIG. 17, the cover member 20 is divided into front and rear parts, and the first divided cover 30 located on the back side and the second divided cover 40 located on the front side are divided on the divided surface. It is glued. The cover member 20 has a right-angled shape on the inside and an arc shape on the outside when viewed from the front. Therefore, as shown in FIGS. 16 and 17, the adhesive surface in this case is an L-shaped first end surface 31a and a fourth end surface 41a formed inside the bent portion, and an arc shape formed outside the bent portion. The second end surface 31b and the fifth end surface 41b of the above.

In the case of the elbow 103 according to the embodiment, the materials of the joint body 10 and the cover member 20, the shape of the main receiving port 11, and the cover member 20 are adhered to the joint body 10 as in the case of the second embodiment. The structure of the bonded portion, the structure of the groove portion 32 in the first split cover 30, the structure of the ridge portion 42 in the second split cover 40, and the like are based on the first embodiment. Therefore, the bonding structure and bonding method between the divided covers and the bonding structure and bonding method of the difference port of the heat insulating pipe P in the main receiving port 11 are also based on the first embodiment.

Since it is configured in this way, the inside of the bent portion of the body portion 13 is easily affected by thermal strain due to a temperature change, and the strength tends to be a problem, but the cover member 20 reinforces the strength of this portion. It also has a function.

(Common matters concerning Embodiment 5 to Embodiment 8)
The pipe fittings according to the fifth to eighth embodiments are intended to improve the weak points of the pipe fittings according to the first to fourth embodiments.

That is, in the case of the pipe joint according to the first to fourth embodiments, positioning is performed with respect to the stepped surfaces 16 and 17 formed at the boundary between the outer surface 13a of the body portion 13 and the outer surface of each receiving port. The protrusion 33 was fitted toward the inside of the concave portion. For this reason, since the wall body forming the stepped surfaces 16 and 17 cooled by the fluid flowing inside has a structure in which the cover member 20 is in direct contact with the cover member 20, the cover member 20 is easily cooled and the outer surface of the cover member 20 is easily cooled. There was a weakness that dew condensation was likely to occur.

On the other hand, in the pipe joint according to the fifth to eighth embodiments, the closed air layer 50 formed between the inner surface 21 of the cover member 20 and the outer surface 13a of the body portion 13 is provided with the body portion 13. It is formed so as to extend from the outer peripheral side of the cover member 20 to the inner surface 21 of the cover member 20 and the outer surface of the cylindrical portion of the main receiving port 11. Further, in the pipe joint according to the fifth to eighth embodiments, the closed air layer 50 is configured in this way, and the positioning portion of the cover member 20 requires contact between the cover member 20 and the joint body 10. And the position of the adhesive portion between the cover member 20 and the outer surface of the main receiving port 11 are separated from the body portion 13.

In these embodiments, the closed air layer 50 is formed so as to extend from the outer peripheral side of the body portion 13 between the inner surface 21 of the cover member 20 and the outer surface of the cylindrical portion in the main receiving port 11. As a result, the cover member 20 covers the outer peripheral side of the receiving port. Therefore, in order to confirm the adhesive state of the heat insulating pipe P to be connected in the receiving port, not only the joint body 10 but also the cover member 20 is made of a transparent resin material.

Hereinafter, each of the pipe fittings according to the fifth to eighth embodiments will be described focusing on the differences from the pipe fittings according to the first to fourth embodiments. In the drawings according to each embodiment described below, the parts corresponding to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified.

(Embodiment 5)
18 and 19 show the pipe fitting according to the fifth embodiment.
The pipe joint according to the fifth embodiment is an elbow similar to the fourth embodiment. The elbow 201 according to the fifth embodiment changes the position and structure of the positioning portion of the cover member 20 in the elbow 103 of the fourth embodiment, and has a structure of an adhesive portion between the end portion of the cover member 20 and the joint body 10. Is changed.

As shown in FIGS. 18 and 19, in the present embodiment, the position of the positioning portion of the cover member 20 is set to the intermediate position of the outer surface in the cylindrical portion of both main receiving ports 11.
In order to do so, the joint body 10 replaces the positioning protrusion 33 in the first to fourth embodiments, and is radially outwardly located at an appropriate intermediate position on the outer surface of the cylindrical portion of both main receiving ports 11. It has a first engaging portion 211 for positioning that projects like a flange.

On the other hand, the cover member 20 has the same basic structure in which the first divided cover 30 located on the back side and the second divided cover 40 located on the front side are adhered to each other on the divided surface, but the implementation is carried out. Instead of the positioning protrusions 33 and 43 in the first to fourth embodiments, the second engaging portion 212 for positioning is provided so as to project inward in the radial direction. The second engaging portion 212 is a thick portion having a certain thickness formed at the end portion of the cover member 20 in the pipe axis direction. The cover member 20 is positioned with respect to the joint body 10 so that the side surface of the second engaging portion 212 on the body 13 side in the pipe axis direction is on the side surface of the first engaging portion 211 on the inlet side into which the heat insulating pipe P is inserted. It is done by abutment engagement. As described above, the joint body 10 and the cover member 20 in the present embodiment are provided with such a positioning structure portion.

Further, the second engaging portion 212 having the end portion of the cover member 20 as a thick portion has a half-divided cylindrical shape, and has an inner surface having a radius equivalent to the outer surface of the cylindrical portion of the main receiving port 11. Has 213. An annular recess 18 for adhering the inner surface 213 to the outer surface of the main receiving port 11 is formed in the cylindrical portion of the outer surface of the main receiving port 11 facing the inner surface 213. Further, the end portion of the cover member 20 and the annular recess 18 constituting the second engaging portion 212 are not shown in an enlarged view here, but in the same manner as described with reference to FIG. 11 with respect to the first embodiment. It is configured so that the adhesive can be injected into the gap between the inner surface 213 and the annular recess 18. As described above, the cover member 20 and the outer surface of the main receiving port 11 in the present embodiment are provided with an adhesive portion having a structure in which the inner surface 213 is adhered to the annular recess 18.

Since the pipe joint according to the fifth embodiment is configured as described above, the cover member 20 includes a positioning portion for setting the mounting position of the cover member 20 and an adhesive portion between the cover member 20 and the joint body 10. The contact position with the joint body 10 and the body portion 13 are separated from each other by a wall constituting the cylindrical portion of the main receiving port 11 that touches the closed air layer. As a result, cooling of the outer surface of the cover member 20 can be suppressed and dew condensation can be alleviated. In this embodiment, the contact position between the cover member 20 and the joint body 10 can be appropriately selected within the range of the length of the wall body constituting the cylindrical portion of the main receiving port 11.

(Embodiment 6)
20 and 21 show the pipe fitting according to the sixth embodiment.
The pipe joint according to the sixth embodiment is the same elbow as the fifth embodiment. The elbow 202 according to the present embodiment is the elbow 201 according to the fifth embodiment in order to avoid sink marks in the resin molding process. In addition, the corner portion of the second engaging portion 212 is a lightening portion 214, whereby the thickness of the end portion of the cover member 20 is adjusted. As a result, the end portion of the cover member 20 has a shape that is bent into a key shape, and the groove portion 32 at the end portion of the first split cover 30 and the second split cover 40 are matched to this shape. The shape of the ridge 42 at the end of the cover is bent into a key shape. The other configurations are the same as those in the fifth embodiment.

(Embodiment 7)
22 to 26 show the pipe fitting according to the seventh embodiment.
As shown in FIGS. 22 to 24, the pipe joint according to the seventh embodiment is the same socket as that of the second embodiment. In the socket 203 of the second embodiment, the socket 203 according to the seventh embodiment has a positioning portion of the cover member 20 and an adhesive portion between the cover member 20 and the joint body 10 on the inlet side of the outer surface of the main receiving port 11. It was collected near the rim of the mouth. That is, in the socket 203 according to the seventh embodiment, the closed air layer 50 extending between the cover member 20 and the outer surface of the main receiving port 11 is made to cover substantially the entire outer peripheral side of the main receiving port 11 and the cover member. The positions of the positioning portion and the adhesive portion of the 20 are configured to be as far as possible from the body portion 13. The socket 203 according to the seventh embodiment has such a configuration so that dew condensation on the outer surface of the cover member 20 can be further alleviated.

In order to do so, the joint body 10 is provided with a flange-shaped protrusion 221 protruding outward in the radial direction at the rims of both main receiving ports 11. Further, the flange-shaped protrusion 221 is formed so that both side surfaces of the heat insulating pipe P located on the pipe axis direction side are substantially perpendicular to the pipe axis.

Further, the joint body 10 is provided with a first engaging portion 211 for positioning that protrudes radially outward from the outer surface of the main receiving port 11 on the center side of the left and right flange-shaped protrusions 221 in the pipe axis direction. Has been done. The first engaging portion 211 is provided in place of the positioning protrusion 33 in the first to fourth embodiments, and is connected to the side surface of the flange-shaped protrusion 221.

On the other hand, the cover member 20 is formed in a substantially half-divided cylindrical shape that fits between the flange-shaped protrusions 221 at both ends with respect to the joint body 10, and projects radially inward on the inner surface 21 thereof. A second engaging portion 212 for positioning is provided. Although the structures of the first engaging portion and the second engaging portion in this embodiment and the first engaging portion and the second engaging portion in the fifth and sixth embodiments are slightly different, Since they have a common function in positioning the cover member 20, they have the same name and reference numeral.

As shown in FIG. 22, in the cover member 20, the side surface of the second engaging portion 212, more specifically, the side surface of the second engaging portion 212 on the inlet side of the main receiving port 11 is the left and right first. It is attached so as to fit between the engaging portions 211. The socket 203 has such a configuration as the configuration of the positioning unit. Further, in the cover member 20 and the joint body 10, when the cover member 20 is attached in this way, the end portion of the inner surface 21 of the half-divided cylindrical portion of the cover member 20 is on the outer surface of the first engaging portion 211. It is set to overlap from the outside. Further, the outer diameter dimension and thickness of the substantially half-divided cylindrical portion of the cover member 20, the radial height of the first engaging portion 211, and the outer diameter dimension of the outer surface of the flange-shaped protrusion 221 are the cover member 20. Is attached, the outer surface of the cover member 20 and the outer surface of the flange-shaped protrusion 221 are configured to be substantially the same.

Further, as shown in the partially enlarged view in FIG. 22, the cover member 20 and the joint body 10 have the end face of the cover member 20 and the flange-shaped protrusion 221 in the pipe axis direction in the state where the cover member 20 is attached in this way. The side surface 222 on the body side is set to face each other while maintaining a gap of a predetermined dimension L. The adhesive portion between the cover member 20 and the outer surface of the main receiving port 11 has such a structure, and as shown in the partially enlarged view in FIG. 22, the end face and the side surface 222 of the cover member 20 An adhesive is injected into the gap using an adhesive injector 60 so that the two companies are adhered to each other.

As shown in the partially enlarged views, FIGS. 25 and 26 in FIG. 22, the adhesive flow path 22 in the present embodiment projects at one end from the side surface 222 of the flange-shaped protrusion 221 on the tube axial trunk side. It is configured to open to the outside through a rectangular parallelepiped-shaped connecting protrusion 223 and a connecting hole 224 formed inside the connecting protrusion 223.

More specifically, as can be seen from FIGS. 25 and 26, the end of the groove portion 32 of the first division cover 30 on the connecting protrusion 223 side is a large groove portion 225 that allows the connecting protrusion 223 to be stored from the back surface. There is. As can be seen from FIG. 26, the tip surface of the connecting protrusion 223 is configured to abut on the stepped boundary surface between the large groove portion 225 and the groove portion 32. Further, as can be seen from FIG. 25, the position of the connecting hole 224 and the size of the cross section are formed to be larger than the size of the cross section of the adhesive flow path 22 and are connected to the entire cross section of the adhesive flow path 22. It is configured to do.

On the other hand, as shown in FIG. 22, the adhesive flow path 22 is an adhesive portion that adheres the end surface of the cover member 20 and the side surface 222 of the flange-shaped protrusion 221 on the tube axial direction body side at the other end, that is, the adhesive portion. It is configured to communicate between the end surface of the cover member 20 and the side surface 222 of the flange-shaped protrusion 221.

Since the pipe joint according to the seventh embodiment is configured as described above, the cover member 20 includes a positioning portion for setting the mounting position of the cover member 20 and an adhesive portion between the cover member 20 and the joint body 10. The position of the contact portion with the joint main body 10 and the body portion 13 are configured to be separated as much as possible from each other through the wall constituting the cylindrical portion of the main receiving port 11 in contact with the closed air layer. In the pipe joint according to the seventh embodiment, cooling of the outer surface of the cover member 20 is suppressed in this way, and dew condensation is alleviated.

(Embodiment 8)
27 to 31 show the pipe fitting according to the eighth embodiment.
As shown in FIGS. 27 to 29, the pipe fitting according to the eighth embodiment is the same socket as that of the seventh embodiment. The socket 204 according to the eighth embodiment reduces dew condensation on the cover member 20 in the same manner as the socket 203 according to the seventh embodiment. For this purpose, the socket 204 has a positioning portion for setting the mounting position of the cover member 20 with respect to the joint body 10 and an adhesive portion for adhering the cover member 20 to the outer surface of the main receiving port 11. The contact portions between the cover member 20 and the joint main body 10 are collected near the rim on the entrance side so as to be separated from the body portion 13 as much as possible. However, the pipe joint according to the eighth embodiment has an adhesive portion for adhering the cover member 20 and the outer surface of the main receiving port 11 in order to facilitate manufacturing as compared with the one of the seventh embodiment. The structure has been changed. In the following description, the parts common to the seventh embodiment are designated by the same reference numerals, and the description thereof will be simplified or omitted.

As shown in FIG. 27, the joint body 10 of the socket 204 according to the eighth embodiment has a flange-shaped protrusion that protrudes radially outward from the rims of both the left and right main receiving ports 11 as in the seventh embodiment. 221 is provided. Further, the flange-shaped protrusion 221 in the present embodiment is formed so that the side surface 231 on the inlet side into which the pipe is inserted in the pipe axis direction is substantially perpendicular to the pipe axis, while the body portion 13 side in the pipe axis direction. The side surface 232 of the above is formed on an inclined surface inclined toward the pipe axis.

Further, the joint body 10 has a first engaging portion 211 for positioning that protrudes radially outward from the outer surface of the main receiving port 11 on the body portion 13 side in the pipe axis direction of both flange-shaped protrusions 221. It is provided. These first engaging portions 211 are provided in place of the positioning protrusions 33 in the first to fourth embodiments, and are flange-shaped protrusions at a portion closer to the pipe axis than the lowest point of the inclined side surface 232. It is combined with 221 and integrated.

On the other hand, the cover member 20 is formed in a substantially half-divided cylindrical shape that fits between the flange-shaped protrusions 221 at both ends with respect to the joint body 10, and projects radially inward on the inner surface 21 thereof. A second engaging portion 212 for positioning is provided. The first engaging portion and the second engaging portion in this embodiment and the first engaging portion and the second engaging portion in the seventh embodiment are slightly different in size and position, but have a structure and a function. It is almost the same in that.

In the cover member 20, as in the case of the seventh embodiment, the side surface of both second engaging portions 212 on the inlet side of the main receiving port 11 is fitted between the left and right first engaging portions 211. Attached to. The socket 204 has such a configuration as the configuration of the positioning unit. Further, in the cover member 20 and the joint body 10, when the cover member 20 is attached in this way, the end portion of the inner surface 21 of the half-divided cylindrical portion of the cover member 20 is on the outer surface of the first engaging portion 211. It is set to overlap from the outside. Further, the outer diameter dimension and thickness of the substantially half-divided cylindrical portion of the cover member 20, the radial height of the first engaging portion 211, and the outer diameter dimension of the outer surface of the flange-shaped protrusion 221 are the cover member 20. Is attached, the outer surface of the cover member 20 and the outer surface of the flange-shaped protrusion 221 are configured to be substantially the same.

Further, as shown in the partially enlarged view in FIG. 27, the end surface 233 of the cover member 20 has a side surface 232 that is inclined toward the body portion 13 of the flange-shaped protrusion 221 in a state where the cover member 20 is attached in this way. It is set to an inclined surface so as to hold a gap of a predetermined dimension L and face each other. As shown in the partially enlarged view in FIG. 27, the cover member 20 and the outer surface of the main receiving port 11 are located in the gap between the side surface 232 of the flange-shaped protrusion 221 on the body portion 13 side and the end surface 233 of the cover member 20. On the other hand, the adhesive is injected by injecting the adhesive from the adhesive injector 60 to adhere the adhesive.

As shown in the partially enlarged views, FIGS. 30 and 31, in FIG. 27, the adhesive flow path 22 in the present embodiment is provided at one end on the side surface 232 of the flange-shaped protrusion 221 on the central side in the pipe axis direction. It is configured to be opened to the outside by the connecting protrusion 223 and the connecting hole 224 penetrating from the central surface of the connecting protrusion 223 to the side surface 231 on the inlet side of the flange-shaped protrusion 221. The connecting protrusion 223 is formed so that the height is equal to the dimension L of the gap and the planar shape is rectangular.

In order to make such a configuration, as shown in the enlarged view of FIG. 27, the end surface 233 of the cover member 20 is configured to abut on the surface of the connecting protrusion 223. Further, as shown in FIGS. 30 and 31, the position of the connecting hole 224 and the size of the cross section are formed to be larger than the size of the cross section of the adhesive flow path 22, and the cross section of the adhesive flow path 22 is formed. It is configured to connect with the whole. Further, the surface shape and size of the connecting protrusion 223 are such that the contact between the end surface 233 of the cover member 20 and the surface of the connecting protrusion 223 can maintain the communication between the adhesive flow path 22 and the connecting hole 224. It is formed. In the present embodiment, since the adhesive portion is configured in this way, when the adhesive is injected into the adhesive flow path from the side surface 231 of the flange-shaped protrusion 221 using the adhesive injector 60, the end surface 233 and the adhesive portion are formed. It is configured so that the adhesive does not leak from between the front surface of the connecting protrusion 223.

On the other hand, as shown in FIG. 27, the adhesive flow path 22 is an adhesive portion that adheres the end surface 233 of the cover member 20 and the side surface 232 of the flange-shaped protrusion 221 on the tube axial direction body side at the other end, that is, the adhesive portion. , It is connected between the end surface of the cover member 20 and the side surface 222 of the flange-shaped protrusion 221 on the body side in the pipe axial direction.

(Embodiment 9 ... System example to which the main joint is applied)
Next, the ninth embodiment will be described with reference to FIG. 32. Embodiment 9 shows an example in which the main joint is applied to the drain pipe of the air conditioning system.

The air conditioning system shown in FIG. 32 is a multi air conditioning system for buildings attached to a building 70 such as an office building. An outdoor unit 71 is installed on the roof of a building, and a plurality of indoor units 72 are connected to the outdoor unit 71 by a refrigerant pipe 73. The indoor unit 72 is a ceiling-embedded air conditioner embedded in the ceiling 74. Refrigerant pipes 73 connecting indoors and outdoors are gathered from each indoor unit 72 through the ceiling to the shaft 75 of the building 70, and are guided from the pigeon hut 76 installed on the roof of the building 70 to the outdoor unit 71. ..

The drain generated in the indoor unit 72 is discharged by the drain pump installed in each indoor unit 72. The discharge pipe 77 for discharging the drain from each indoor unit 72 is connected to the lateral running pipe 78 arranged in the ceiling by the different diameter cheese 1 according to the first embodiment, and the different diameter cheese 1, elbow 103, etc. It is connected to a vertically running collective pipe 79 arranged in the shaft 75. The drain discharged from each room is discharged to the outside by such a vertically running collective pipe 79. As shown in this embodiment, the drain pipe in the air conditioning system installed in a general office building is composed of a discharge pipe 77, a horizontal running pipe 78, a vertical running collective pipe 79, etc., and these drain pipes are connected to each other. It is connected by different diameter cheese 1, elbow 103, etc.

According to the air conditioning system having such a configuration, it is not necessary to insulate the pipes and pipe joints at the construction site of the drain pipe, and the work man-hours can be reduced.
In addition, since the work of assembling the pipe joint having the heat insulating function is easier than in the past, the work man-hours of the air conditioning system are reduced as a whole.

Further, since the drain pipe is provided with a coating layer P2 formed of a closed cell foam resin material on the outer surface of the pipe body P1 made of a rigid resin, moisture may be absorbed by the coating layer P2. It is possible to maintain high heat insulation performance. Further, since the outer surface of the coating layer P2 is formed on a substantially non-foamed hard surface layer portion, it is not easily scratched and has a good appearance.

Further, since the outlet of the drain pipe is adhered to the receptacle by the adhesive in a state of being press-fitted into the socket, it is easy to avoid water leakage. In particular, when the foamed resin material constituting the coating layer P2 of the drain pipe and the synthetic resin material constituting the joint body 10 constituting the socket are polyvinyl chloride, the synthetic resin forming the coating layer P2 in the receptacle is used. Since the synthetic resin constituting the joint body 10 is melted and swollen by the adhesive and fused, water leakage is more reliably avoided.

(Modification example)
The description of each of the above embodiments is an example of a possible form of the pipe joint according to the present invention, and is not limited to the form. It should be noted that a form in which at least two modifications that do not contradict each other may be combined may be used.

(1) Further, the structure of the positioning portion of the cover member 20 and the adhesive portion between the cover member 20 and the outer surface of the main receiving port 11 shown in the fifth and sixth embodiments is the same as that of the different diameter cheese 1 of the first embodiment. , The closed air layer 50 may be extended between the cover member 20 and the outer surface of the main receiving port 11 by applying to the socket 101 of the second embodiment and the different diameter socket 102 of the third embodiment. Similarly, the structure of the positioning portion of the cover member 20 and the adhesive portion between the cover member 20 and the outer surface of the main receiving port 11 shown in the seventh and eighth embodiments is the same as that of the first embodiment of the different diameter cheese 1. The sealed air layer 50 may be extended between the cover member 20 and the outer surface of the main receiving port 11 by applying to the different diameter socket 102 of the third embodiment and the elbow 103 of the fourth embodiment.

(2) The technical idea of the main pipe joint is not applied only to some of the joints shown in the above embodiment, and other types of pipe joints, for example, the main receiving port 11 and the branch receiving port 12 are applied. Of course, it can also be applied to cheeses with the same diameter, 45 ° elbows, Y-shaped pipe fittings, elbows with different diameters, and the like.

(3) In each embodiment, the cover member 20 is divided into two parts in the front-rear direction in the plane including the pipe axis of the heat insulating pipe P to be connected, but as long as the cover member 20 is not hindered in manufacturing and assembling. The divided portion may be changed, and the number of divided portions may be 3 or more. For example, in the first embodiment, the portion around the branch socket 12, that is, the portion forming a tubular shape in the vertical direction and the portion forming a horizontal tubular shape connecting between the main sockets 11 are made separate members. It may be divided into two. Further, the divided portion in each direction may be further divided into two parts in the front-rear direction and divided into four parts in diameter.

(4) In each embodiment, the materials of the joint body 10, the cover member 20, and the heat insulating pipe P are unified into a polyvinyl chloride resin material, enabling adhesion with a solvent-type adhesive (soluble adhesive). However, other resin materials may be used from the viewpoint of cost reduction and the like.

(5) The heat insulating pipe P and the pipe joint are not only used for drain pipes as in the air conditioning system according to the ninth embodiment, but also convey other low-temperature fluids, for example, cold water as a cooling source. It can also be applied to piping systems and other piping systems for transporting cold fluids. Further, as the pipe joint, not only the one exemplified in this embodiment 9 but also other types may be appropriately used.

P Insulation piping P1 Pipe body P2 Coating layer P21 Surface layer P22 Inner layer S Gap X End face position 1 Different diameter cheese 10 Joint body 11a Mouth bottom 11b Contact surface 12a Mouth bottom 12b Contact surface 13 Body 13a (of the body) Surface 14 Insulation plate 16 Stepped surface 17 Stepped surface 18 Annular recess 20 Cover member 21 (of the cover member) Inner surface 22 Adhesive flow path 30 First split cover 31 Split end face 32 Groove 33 Positioning protrusion 40 Second split cover 41 Split End face 42 Protrusion 43 Positioning protrusion 50 Sealed air layer 60 Adhesive injector 211 First engagement part 212 Second engagement part 221 Joint protrusion 223 Connection protrusion 224 Connection hole

Claims (19)

A pipe joint for connecting heat insulating pipes (P) having a coating layer (P2) made of foamable resin formed on the outer periphery of a pipe body (P1) made of a rigid resin.
A joint body (10) having a plurality of receiving ports for inserting and adhering the outlets of the heat insulating pipe (P) to be connected, and a body portion (13) for connecting between the plurality of receiving ports.
It has a cover member (20) attached so as to cover the outer surface (13a) of the body portion (13) from the outside of the joint body (10).
The joint body (10) and the cover member (20) have a closed air layer (50) between the inner surface (21) of the cover member (20) and the outer surface (13a) of the body portion (13). ) Is configured to form
The cover member (20) is attached to the receiving port of the joint body (10) so that the heat insulating pipe (P) is connected to the joint body (10) and does not cover the heat insulating pipe (P) . A pipe fitting that extends to the outer surface and is adhered to the outer surface of the socket with an adhesive so as to maintain the airtightness of the closed air layer (50). The pipe joint according to claim 1, wherein the joint body (10) and the cover member (20) are made of a transparent resin material. The joint body (10) is formed in a tubular shape having an outer diameter smaller than the outer diameter of the socket so that the outer surface of the body portion (13) becomes a concave portion between the plurality of sockets.
The pipe joint according to claim 1 or 2, wherein the cover member (20) is adhered to the outer surface of the socket so as to form the concave portion with the closed air layer (50). In the joint body (10), a heat insulating plate material (14) made of an independent foamable resin is adhered to a wall portion forming the mouth bottom portions (11a, 12a) of the receiving port, and the surface of the heat insulating plate material (14) is formed. The pipe joint according to claim 3, wherein the contact surface (11b, 12b) of the outlet in the heat insulating pipe (P) to be connected is formed. The pipe joint according to claim 4, wherein the cover member (20) is formed by adhering a plurality of divided covers. The cover member (20) includes a first divided cover (30) and a second divided cover (40) divided by using a plane including a pipe axis of the heat insulating pipe (P) connected to the receiving port as a divided surface. The first divided cover (30) and the second divided cover (40) are bonded to each other at both divided end faces (31, 41) forming the divided surface. Item 5. The pipe fitting according to Item 5. In the cover member (20), a groove portion (32) extending in the longitudinal direction of the divided end face (31) is formed on the divided end surface (31) of the first divided cover (30), and the other second division is formed. A ridge portion (42) fitted to the groove portion (32) is formed on the split end surface (41) of the cover (40), and the first split cover (30) and the second split cover (40) are formed. Is combined so that the ridge portion (42) fits into the groove portion (32), and is adhered between the front end surface of the combined ridge portion (42) and the bottom surface of the groove portion (32). The pipe joint according to claim 6, wherein an adhesive flow path (22) that allows the agent to flow is formed. The adhesive flow path (22) is an adhesive portion between a plurality of the divided end faces (31, 41) formed by combining the first divided cover (30) and the second divided cover (40). Is formed so as to be independent for each of the adhesive portions.
The adhesive flow path (22) formed so as to be independent has one end opened to the outside from one end surface in the pipe axial direction of the cover member (20) bonded to the outer surface of the receiving port. 7. The other end of the cover member (20) communicates with the adhesive portion between the cover member (20) and the outer surface of the socket at the other end portion of the cover member (20) in the pipe axis direction. Pipe joint. The joint body (10) has an annular recess (18) that is wider than the depth on the outer surface of the socket for forming the adhesive portion between the cover member (20) and the outer surface of the socket. ) Is formed,
In the cover member (20), the end portion in the pipe axial direction constitutes the adhesive portion with the outer surface of the receiving port.
The end portion of the cover member (20) in the pipe axial direction is formed so that the end edge does not protrude from the annular recess (18) to the outer surface on the inlet side of the receiving port, whereby the cover member (20) is formed. A gap (S) is formed between the edge of the member (20) and the edge of the annular recess (18).
The gap (S) is such that the outflow of the adhesive in the annular recess (18) is avoided due to surface tension, and the needle-shaped injection portion in the adhesive injector (60) is annularly formed from the outside. The pipe joint according to claim 8, which is formed to such an extent that it can be inserted into the recess (18). In the joint body (10) and the cover member (20), the closed air layer (50) has an inner surface (21) of the cover member (20) and an outer surface (13a) of the body portion (13). The pipe joint according to any one of claims 1 to 9, which is configured to extend between the inner surface (21) of the cover member (20) and the outer surface of the socket. .. The joint body (10) has a first engaging portion (211) for positioning that protrudes outward in the radial direction on the outer surface of the receiving port.
The cover member (20) has a second positioning portion (212) for positioning that protrudes inward in the radial direction, which engages with the first engaging portion (211).
The adhesive portion between the cover member (20) and the outer surface of the socket is formed between the end portion in the pipe axial direction on the inner surface of the cover member (20) and the outer surface of the socket. The pipe fitting according to claim 8 or 9. The joint body (10) has a first engaging portion (211) for positioning that protrudes outward in the radial direction on the outer surface of the receiving port.
The cover member (20) has a second positioning portion (212) for positioning that protrudes inward in the radial direction, which engages with the first engaging portion (211).
The adhesive portion between the cover member (20) and the outer surface of the socket is a flange-shaped protrusion (221) formed on the mouth edge of the socket and protruding outward in the radial direction and the cover member (20). Formed between the end face of
The pipe joint according to claim 8, wherein the flange-shaped protrusion (221) is provided with a connecting protrusion (223) and a connecting hole (224) for opening one end of the adhesive flow path to the outside. .. The recessed portion has a stepped surface (16, 17) in a direction intersecting the pipe axis at a boundary portion with the outer surface of the receiving port.
The cover member (20) is inserted in a fitted state from the outside in the radial direction toward the inside of the concave portion with respect to the stepped surface (16, 17). , 43) The pipe fitting according to claim 8 or 9. 13. The pipe according to claim 13, wherein the cover member (20) is configured to form a gap between the tip surface of the positioning protrusion (33, 43) and the outer surface of the body portion (13). Fittings. The joint body (10) is made of a transparent resin material and is formed of a transparent resin material.
In the cover member (20), the position (X) of the end surface of the cover member (20) fixed to the outer surface of the socket in the pipe axis direction is the contact surface (11b, 12b) of the socket. The pipe fitting according to claim 13 or 14, which is formed so as to be equivalent to the position. A pipe joint for connecting heat insulating pipes (P) having a coating layer (P2) made of foamable resin formed on the outer periphery of a pipe body (P1) made of a rigid resin.
A joint body (10) having a plurality of receiving ports for inserting and adhering the outlets of the heat insulating pipe (P) to be connected, and a body portion (13) for connecting between the plurality of receiving ports.
It has a cover member (20) attached so as to cover the outer surface (13a) of the body portion (13) from the outside of the joint body (10).
The joint body (10) and the cover member (20) have a closed air layer (50) between the inner surface (21) of the cover member (20) and the outer surface (13a) of the body portion (13). ) Is configured to form
The joint body (10) and the cover member (20) are pipe joints formed of a transparent resin material. Drain piping consisting of heat insulating piping (P) and
An air conditioning system provided with the pipe joint according to any one of claims 1 to 16 for connecting the drain pipes to each other. The drain pipe includes a pipe body (P1) made of a rigid resin and a coating layer (P2) made of a closed cell foam resin material that covers the outer surface of the pipe body (P1). It is a heat insulating pipe (P)
The coating layer (P2) is composed of a non-foaming hard surface layer portion (P2) formed on the outer surface and a foamed inner layer portion (P22) on the inner peripheral side of the surface layer portion (P21). The air conditioning system according to claim 17, wherein the surface layer portion (P21) and the inner layer portion (P22) are integrally formed. The outer diameter of the outlet in the drain pipe and the inner diameter of the socket in the pipe joint are formed so that the outlet is press-fitted into the socket.
The air conditioning system according to claim 18, wherein the outlet is adhered to the socket with an adhesive in a state of being press-fitted into the socket.

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