Heat insulation unit for piping

Abstract

To provide a heat insulation unit for piping with a novel structure that makes it possible to adjust a temperature of a fluid flowing in piping.SOLUTION: A heat insulation unit 1 for piping has: a cylindrical outside pipe 3 which accommodates piping 2, and forms a pipe body inside flow passage K where a sub-fluid flows between itself and the piping; and a pair of joints 4 which retain both ends of the outside pipe. The joint comprises: a main body part 6 which is fitted with the piping and the outside pipe, and forms a joint inside flow passage T where the sub-fluid flows; a first fitting unit 7 through which the piping is inserted and which fits the piping to the main body part detachably; and a second fitting unit 8 through which the piping is inserted and which fits the outside pipe to the main body part detachably, wherein the joint inside flow passage communicates with the pipe body inside flow passage when the piping and the outside pipe are fitted to the main body part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heat insulation unit for pipes.

Background Art

[0002] A production apparatus for functional chemical products includes pipes through which solutions having various properties flow. Among the solutions, there are solutions that tend to crystallize (precipitate) due to temperature changes in the pipes. Solids generated by crystallization can accumulate in the pipes and impede the flow of the solution in the pipes. Therefore, in order to avoid crystallization of the solution, a method of insulating the pipes is used. However, the solution can be deteriorated by temperature changes. Therefore, it is necessary to adjust the temperature of the solution flowing through the pipes.

[0003] The heat insulation method disclosed in Patent Document 1 places urethane foam on the outer peripheral surface of the pipe to insulate the fluid flowing through the pipe. The heat insulation method using urethane foam reduces the influence of the outside temperature on the fluid flowing through the pipe. However, the heat insulation method using urethane foam cannot be heated (cooled), and it is difficult to keep the temperature of the fluid flowing through the pipe constant.

[0004] The heat insulation method disclosed in Patent Document 2 wraps a ribbon heater around the outer peripheral surface of the pipe to insulate the fluid flowing through the pipe. The heat insulation by the ribbon heater can keep the temperature of the fluid flowing through the pipe within a certain temperature range by heating the pipe. However, in the heat insulation method using the ribbon heater, unevenness can occur in the heated area depending on the winding method around the pipe. Therefore, it is difficult to accurately adjust the temperature of the fluid flowing through the pipe. Also, the heat insulation method using the ribbon heater cannot cool the fluid flowing through the pipe.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to provide a heat-insulating unit for pipes having a novel structure that enables temperature adjustment of a fluid flowing through a pipe.

Means for Solving the Problems

[0007] The heat-insulating unit for pipes according to the present invention is a heat-insulating unit for pipes that insulates a main fluid flowing through a pipe via the pipe, and includes a cylindrical outer pipe that houses the pipe and forms an internal flow path for a secondary fluid to flow between the outer pipe and the pipe, and a pair of joints that hold both ends of the outer pipe. The joint includes a main body portion to which the pipe and the outer pipe are attached and that forms an internal flow path for the secondary fluid to flow, a first attachment unit through which the pipe is inserted and that detachably attaches the pipe to the main body portion, and a second attachment unit through which the pipe is inserted and that detachably attaches the outer pipe to the main body portion. The main body portion includes a through hole through which the pipe can be inserted, a first attachment portion where an end on one end side of the through hole is disposed and to which the first attachment unit is attached, and a second attachment portion where an end on the other end side of the through hole is disposed and to which the second attachment unit is attached. When the pipe and the outer pipe are attached to the main body portion, the internal flow path of the joint communicates with the internal flow path of the pipe body. This is a characteristic.

Effects of the Invention

[0008] The present invention enables temperature adjustment of a fluid flowing through a pipe.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0010] Embodiments of the heat insulation unit for piping according to the present invention (hereinafter referred to as "this unit") will be described below together with the drawings.

[0011] ● Embodiment (1) of This Unit ● ● Configuration (1) of This Unit The configuration of this unit will be described below.

[0012] FIG. 1 is a schematic diagram showing an embodiment of this unit. FIG. 2 is an enlarged cross-sectional view of one joint included in this unit. FIG. 3 is an exploded enlarged cross-sectional view of one joint.

[0013] This unit 1 is arranged on a pipe 2 through which a solution having various properties (hereinafter referred to as "main fluid") flows in a production apparatus for functional chemical products.

[0014] The pipe 2 is arranged inside the production apparatus for functional chemical products or between apparatuses. The main fluid flows inside the pipe 2. The pipe 2 is tubular. The pipe 2 has a pipe outer peripheral surface 21 in the radial direction of the pipe 2.

[0015] This unit 1 insulates the main fluid flowing inside the pipe 2. The main fluid is insulated through the pipe 2. This unit 1 enables temperature adjustment of the main fluid flowing inside the pipe 2. This unit 1 includes an outer pipe 3 and a pair of joints 4, 4.

[0016] The outer pipe 3 houses the pipe 2. The outer pipe 3 is tubular. That is, the pipe 2 and the outer pipe 3 form a double pipe. A fluid different from the main fluid (hereinafter referred to as "sub-fluid") flows between the outer pipe 3 and the pipe 2. The space between the outer pipe 3 through which the sub-fluid flows and the pipe 2 forms an internal pipe flow path K.

[0017] The axial length of the outer pipe 3 is set according to the axial length of the pipe 2. The length of the outer pipe 3 is shorter than the length of the pipe 2. The thickness of the outer pipe 3 (the length in the radial direction of the pipe) can be freely set according to the thickness of the pipe 2. The thickness of the outer pipe 3 is thicker than the thickness of the pipe 2.

[0018] The "sub-fluid" has a predetermined temperature supplied from a supply source (not shown). The sub-fluid is a liquid or a gas. The sub-fluid is a medium that keeps the temperature of the main fluid constant through heat exchange with the main fluid. The supply source is, for example, a water heater.

[0019] The internal pipe flow path K is a flow path formed between the outer peripheral surface 21 of the pipe 2 and the inside of the outer pipe 3. The sub-fluid flows through the internal pipe flow path K.

[0020] A pair of joints 4, 4 hold both ends of the outer pipe 3 respectively. The pair of joints 4, 4 is detachably attached to the pipe 2. That is, the pair of joints 4, 4 and the outer pipe 3 are detachably attached to the pipe 2.

[0021] The outer conduit 5 introduces the sub-fluid from the supply source. The outer conduit 5 is tubular. The outer conduit 5 is detachably attached to the main body 6.

[0022] The joint 4 connects the pipe 2, the outer pipe 3, and the outer conduit 5 to each other.

[0023] Here, the pair of joints 4, 4 attached to both ends of the outer pipe 3 are of the same shape and have a common function. The pair of joints 4, 4 are attached symmetrically to both ends of the outer pipe 3. Therefore, the specific configuration of the joint 4 is described by one of the joints 4.

[0024] The joint 4 includes a main body portion 6, a first attachment unit 7, a second attachment unit 8, and a third attachment unit 9.

[0025] The main body portion 6 is a branch pipe. The pipe 2, the outer pipe 3, and the outer conduit 5 are detachably attached to the main body portion 6. The pipe 2 is attached to the main body portion 6 via the first attachment unit 7. The outer pipe 3 is attached to the main body portion 6 via the second attachment unit 8. The first attachment unit 7 and the second attachment unit 8 are attached to the main body portion 6. The main body portion 6 to which the pipe 2 and the outer pipe 3 are attached forms a joint internal flow path T through which the secondary fluid flows. The outer conduit 5 is attached to the main body portion 6 via the third attachment unit 9.

[0026] The joint internal flow path T is a flow path through which the secondary fluid flows inside the main body portion 6. When the unit 1 is attached to the pipe 2, the joint internal flow path T communicates with the pipe body internal flow path K. That is, when the pipe 2 and the outer pipe 3 are attached to the main body portion 6, the joint internal flow path T communicates with the pipe body internal flow path K.

[0027] The main body portion 6 includes a through hole 61h through which the pipe 2 is inserted. The through hole 61h penetrates the inside of the main body portion 6 from one end (first end) side of the main body portion 6 to the other end (second end) side. The main body portion 6 includes a communication hole 63h that opens to the outer peripheral surface 62 of the main body portion 6 and communicates with the through hole 61h. That is, the main body portion 6 has three openings. The main body portion 6 branches into three branches inside the main body portion 6.

[0028] The "one end side (first end side)" is the outer side in the axial direction of the outer pipe 3 in the unit 1. One end (first end) of the main body portion 6 is the end located on the outer side in the axial direction of the outer pipe 3 in the unit 1.

[0029] The "other end side (second end side)" is the inner side in the axial direction of the outer pipe 3 in the unit 1. The other end (second end) is the end located on the inner side in the axial direction of the outer pipe 3 in the unit 1.

[0030] The pipe 2 is inserted through the through-hole 61h and is disposed in the through-hole 61h. The outer pipe 3 is attached to the end portion on the other end side of the through-hole 61h. The outer conduit 5 is attached to the communication hole 63h. The main body portion 6 includes a first attachment portion 64, a second attachment portion 65, and a third attachment portion 66.

[0031] The first attachment portion 64 is disposed in the main body portion 6 at the end portion on one end side of the through-hole 61h. A first attachment unit 7 is attached to the first attachment portion 64. The first attachment portion 64 is cylindrical. The first attachment portion 64 includes an outer peripheral surface 641 and an inner peripheral surface 642. The first attachment portion 64 includes a female screw portion 64i disposed on the inner peripheral surface 642.

[0032] The second attachment portion 65 is disposed in the main body portion 6 at the end portion on the other end side of the through-hole 61h. A second attachment unit 8 is attached to the second attachment portion 65. The second attachment portion 65 is cylindrical. The second attachment portion 65 includes an outer peripheral surface 651 and an inner peripheral surface 652. The second attachment portion 65 includes a female screw portion 65i disposed on the other end side of the inner peripheral surface 652 and a frustum-shaped tapered surface 65t disposed on one end side of the inner peripheral surface 652 and expanding in diameter toward the other end side.

[0033] The third attachment portion 66 is disposed in the main body portion 6 at the end portion on the opening side of the communication hole 63h. A third attachment unit 9, which will be described later, is attached to the third attachment portion 66. The third attachment portion 66 is cylindrical. The third attachment portion 66 includes an outer peripheral surface 661 and an inner peripheral surface 662. The third attachment portion 66 includes a female screw portion 66i disposed on the inner peripheral surface 662.

[0034] The first attachment unit 7 has the pipe 2 inserted therethrough and is detachably attached to the main body portion 6. The first attachment unit 7 is detachably attached to the pipe 2. The first attachment unit 7 includes an annular first seal member 71 and a first pressing member 72.

[0035] The first seal member 71 prevents leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6. The first seal member 71 includes a frustum-shaped outer peripheral surface 711 that tapers toward one end side.

[0036] The first pressing member 72 is attached inside the first attachment portion 64. At this time, the first pressing member 72 presses the first sealing member 71 toward the pipe 2 side.

[0037] The first pressing member 72 includes a cylindrical outer peripheral surface 721 and an inner peripheral surface 722. The first pressing member 72 includes a male screw portion 72e disposed on the outer peripheral surface 721. The inner peripheral surface 722 of the first pressing member 72 is in the shape of a frustum of a cone that expands in diameter toward the other end side.

[0038] The female screw portion 64i of the first attachment portion 64 and the male screw portion 72e of the first pressing member 72 are fitted together, whereby the first pressing member 72 is attached to the first attachment portion 64. When the first pressing member 72 is attached to the first attachment portion 64, the outer peripheral surface 711 of the first sealing member 71 abuts against the inner peripheral surface 722 of the first pressing member 72.

[0039] The second attachment unit 8 has the pipe 2 inserted therethrough and is detachably attached to the main body portion 6. The second attachment unit 8 detachably attaches the outer pipe 3. The second attachment unit 8 includes an annular second sealing member 81 and a second pressing member 82.

[0040] The second sealing member 81 prevents leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6. The second sealing member 81 includes a frustum-shaped outer peripheral surface 811 that tapers toward one end side.

[0041] The second pressing member 82 is attached inside the second attachment portion 65. At this time, the second pressing member 82 presses the second sealing member 81 toward the outer pipe 3 side.

[0042] The second pressing member 82 includes a cylindrical outer peripheral surface 821 and an inner peripheral surface 822. The second pressing member 82 includes a male screw portion 82e disposed on the outer peripheral surface 821. The female screw portion 65i of the second attachment portion 65 and the male screw portion 82e of the second pressing member 82 are fitted together, whereby the second pressing member 82 is attached to the second attachment portion 65.

[0043] When the second pressing member 82 is attached to the second attachment portion 65, the outer peripheral surface 811 of the second seal member 81 abuts against the tapered surface 65t of the second attachment portion 65. That is, the second pressing member 82 presses the second seal member 81 against the outer tube 3 side by pressing the second seal member 81 toward one end side.

[0044] The third attachment unit 9 is detachably attached to the main body portion 6 with the outer conduit 5 inserted therein. The third attachment unit 9 detachably attaches the outer conduit 5. The third attachment unit 9 includes an annular third seal member 91 and a third pressing member 92.

[0045] The third seal member 91 prevents leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6. The third seal member 91 includes a frustum-shaped outer peripheral surface 911 that tapers toward the opening side of the communication hole 63h.

[0046] The third pressing member 92 is attached to the third attachment portion 66 and presses the third seal member 91 toward the outer conduit 5 inside the third attachment portion 66.

[0047] The third pressing member 92 includes a cylindrical outer peripheral surface 921 and an inner peripheral surface 922. The third pressing member 92 includes a male screw portion 92e disposed on the outer peripheral surface 921. The inner peripheral surface 922 of the third pressing member 92 is frustum-shaped and expands in diameter toward the through hole 61h side.

[0048] When the female screw portion 66i and the male screw portion 92e are engaged, the third pressing member 92 is attached to the third attachment portion 66. When the third pressing member 92 is attached to the third attachment portion 66, the outer peripheral surface 911 of the third seal member 91 abuts against the inner peripheral surface 922 of the third pressing member 92. That is, the third pressing member 92 presses the third seal member 91 downward to press the third seal member 91 toward the outer conduit 5 side.

[0049] ● Assembly of this unit (1) The assembly of this unit 1 will be described below.

[0050] In the following description, FIGS. 1-3 are referred to as appropriate.

[0051] First, the outer pipe 3 is attached to the pipe 2. The outer pipe 3 covers a predetermined region of the pipe 2. The pipe 2 is inserted inside the outer pipe 3. A double pipe is formed in the region of the pipe 2 to which the outer pipe 3 is attached.

[0052] Next, a pair of joints 4, 4 are respectively arranged at both ends of the outer pipe 3. A second attachment unit 8 is arranged at the end of the outer pipe 3. The second attachment unit 8 includes an annular second seal member 81 and a second pressing member 82. Following the outer pipe 3, the second pressing member 82 is inserted into the pipe 2. Following the second pressing member 82, the second seal member 81 is inserted into the pipe 2.

[0053] Following the second pressing member 82, the main body portion 6 is inserted into the pipe 2. The pipe 2 penetrates through the through hole 61h. A second attachment portion 65 is arranged on the side (the other end side) where the second attachment unit 8 is arranged.

[0054] A first attachment unit 7 is arranged on one end side of the main body portion 6. The first attachment unit 7 includes an annular first seal member 71 and a first pressing member 72. Following the main body portion 6, the first seal member 71 is inserted into the pipe 2. Following the first seal member 71, the first pressing member 72 is inserted into the pipe 2.

[0055] Next, the end of the outer pipe 3 is inserted from the opening of the second attachment portion 65 into the inside of the main body portion 6. The end of the outer pipe 3 is inserted to a predetermined position inside the main body portion 6.

[0056] Next, while pushing the second seal member 81 into the inside of the main body portion 6, the second pressing member 82 is inserted into the second attachment portion 65. The second attachment portion 65 is attached to the second attachment portion 65 by fitting the female screw portion 65i of the second attachment portion 65 and the male screw portion 82e of the second pressing member 82. At this time, the outer peripheral surface 811 of the second seal member 81 abuts against the tapered surface 65t of the second attachment portion 65.

[0057] The second pressing member 82 presses the second sealing member 81 against the outer tube 3 by pressing the second sealing member 81 against one end side. By this pressing force, the outer tube 3 is fixed to the main body portion 6. At the same time, the second sealing member 81 is also pressed against the tapered surface 65t. By this pressing force, the second sealing member 81 is deformed to prevent leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6.

[0058] Next, while pushing the first sealing member 71 into the main body portion 6, the first pressing member 72 is inserted into the first attachment portion 64. The first pressing member 72 is attached to the first attachment portion 64 by fitting the female screw portion 64i of the first attachment portion 64 and the male screw portion 72e of the first pressing member 72. At this time, the outer peripheral surface 711 of the first sealing member 71 abuts against the inner peripheral surface 722 of the first pressing member 72.

[0059] The first pressing member 72 presses the first sealing member 71 against the pipe 2 side. By this pressing force, the pipe 2 is fixed to the main body portion 6. At the same time, the first sealing member 71 is also pressed against the other end side. By this pressing force, the first sealing member 71 is deformed to prevent leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6.

[0060] Next, the end portion of the outer conduit 5 is inserted into the main body portion 6 through the opening of the third attachment portion 66. The end portion of the outer conduit 5 is inserted to a predetermined position inside the main body portion 6.

[0061] Next, while pushing the third sealing member 91 into the main body portion 6, the third pressing member 92 is inserted into the third attachment portion 66. The third pressing member 92 is attached to the third attachment portion 66 by fitting the female screw portion 66i of the third attachment portion 66 and the male screw portion 92e of the third pressing member 92. At this time, the outer peripheral surface 911 of the third sealing member 91 abuts against the inner peripheral surface 922 of the third pressing member 92.

[0062] The third pressing member 92 presses the third sealing member 91 toward the outer conduit 5. Due to this pressing force, the outer conduit 5 is fixed to the main body portion 6. At the same time, the third sealing member 91 is also pressed toward the through-hole 61h side. Due to this pressing force, the third sealing member 91 deforms, preventing the leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6.

[0063] Next, the outer conduit 5 is connected to a source for introducing the secondary fluid or a discharge path (not shown) for discharging the secondary fluid. The upstream outer conduit 5 is connected to the source. The downstream outer conduit 5 is connected to the drainage path.

[0064] "Upstream" refers to the upstream side where the fluid flows. That is, upstream refers to the source side in the flow of the secondary fluid from the source to this unit 1.

[0065] "Downstream" refers to the downstream side where the fluid flows. That is, downstream refers to the side of this unit 1 in the flow of the secondary fluid from the source to this unit 1.

[0066] Note that in the present invention, the downstream outer conduit may be connected to the source so that the secondary fluid circulates.

[0067] ● Method of using this unit (1) The method of using this unit 1 is described below.

[0068] First, the temperature-adjusted secondary fluid is supplied from the source to this unit 1 through the upstream outer conduit 5. The secondary fluid is supplied to enable precise temperature adjustment. In this unit 1, temperature adjustment of the main fluid is performed. At this time, the main fluid is heated. In this unit 1, heat exchange is performed between the main fluid and the secondary fluid. The temperature-adjusted secondary fluid is discharged to the discharge path through the downstream outer conduit 5.

[0069] The secondary fluid flows from the upstream side to the downstream side in the same manner as the main fluid flowing through the pipe 2. That is, the secondary fluid supplied from the supply source flows from the upstream outer conduit 5, through the internal flow path T of the upstream joint, the internal flow path K of the pipe body of the outer pipe 3, and the internal flow path T of the downstream joint, and then flows through the downstream outer conduit 5.

[0070] The secondary fluid flowing through the downstream outer conduit 5 is discharged to the outside of the main body 6 through the discharge path.

[0071] Since the unit 1 is provided with a detachable joint 4, it can be attached to the existing pipe 2. Since the unit 1 is provided with a detachable joint 4, it is also possible to remove the unit 1. When the manufacturing process of the functional chemical product is changed, the unit 1 can be arranged at the appropriate position of the pipe 2 according to the properties of the functional chemical product.

[0072] ● Summary (1) ● In the embodiment described above, the unit 1 includes a cylindrical outer pipe 3 that houses the pipe 2 and forms an internal flow path K for the secondary fluid to flow between the pipe 2, and a pair of joints 4 that hold both ends of the outer pipe 3. The joint 4 includes a main body 6, a first attachment unit 7, and a second attachment unit 8. The main body 6 has the pipe 2 and the outer pipe 3 attached thereto, and forms an internal flow path T for the secondary fluid to flow. The first attachment unit 7 has the pipe 2 inserted therethrough and detachably attaches the pipe 2 to the main body 6. The second attachment unit 8 has the pipe 2 inserted therethrough and detachably attaches the outer pipe 3 to the main body 6. The main body 6 includes a through hole 61h through which the pipe 2 can be inserted, a first attachment portion 64, and a second attachment portion 65. The first attachment portion 64 is disposed at an end on one end side of the through hole 61h. The first attachment unit 7 is attached to the first attachment portion 64. The second attachment portion 65 is disposed at an end on the other end side of the through hole 61h. The second attachment unit 8 is attached to the second attachment portion 65. When the pipe 2 and the outer pipe 3 are attached to the main body 6, the internal flow path T of the joint communicates with the internal flow path K of the pipe body. According to this configuration, the unit 1 enables temperature adjustment of the main fluid flowing through the pipe 2.

[0073] Also, in the embodiment described above, the first attachment portion 64 includes a female screw portion 64i disposed on the cylindrical inner peripheral surface 642. The first attachment unit 7 includes an annular first seal member 71 and a first pressing member 72 that presses the first seal member 71 toward the pipe 2 side. The first pressing member 72 includes a male screw portion 72e on the cylindrical outer peripheral surface 721. By fitting the female screw portion 64i and the male screw portion 72e, the first pressing member 72 is attached to the first attachment portion 64. According to this configuration, the first attachment unit 7 is detachably attached to the first attachment portion 64. The unit 1 is detachably attached to the pipe 2.

[0074] Furthermore, in the embodiment described above, the first seal member 71 includes a frustum-shaped outer peripheral surface 711 that tapers toward the other end side. The first pressing member 72 includes a frustum-shaped inner peripheral surface 722 that expands in diameter toward the other end side. When the first pressing member 72 is attached to the first attachment portion 64, the outer peripheral surface 711 of the first seal member 71 abuts against the inner peripheral surface 722 of the first pressing member 72. According to this configuration, since the first pressing member 72 presses the first seal member 71 toward the pipe 2 side, the pipe 2 is fixed to the main body portion 6. At the same time, since the first pressing member 72 presses the first seal member 71 toward the other end side, the first seal member 71 is deformed, preventing the leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6.

[0075] Moreover, in the embodiment described above, the second attachment portion 65 includes a female screw portion 65i disposed on the cylindrical inner peripheral surface 652. The second attachment unit 8 includes an annular second seal member 81 and a second pressing member 82 that presses the second seal member 81 toward the outer pipe 3 side. The second pressing member 82 includes a male screw portion 82e disposed on the cylindrical outer peripheral surface 821. By fitting the female screw portion 65i and the male screw portion 82e, the second pressing member 82 is attached to the second attachment portion 65. According to this configuration, the second attachment unit 8 is detachably attached to the second attachment portion 65. The outer pipe 3 is detachably attached to the pipe 2.

[0076] Furthermore, in the embodiment described above, the second seal member 81 includes a frustum-shaped outer peripheral surface 811 that tapers toward one end side. The second attachment portion 65 includes a female screw portion 65i disposed on the other end side of the inner peripheral surface 652 and a frustum-shaped tapered surface 65t disposed on the one end side of the inner peripheral surface 652 and expanding in diameter toward the other end side. When the second pressing member 82 is attached to the second attachment portion 65, the outer peripheral surface 811 of the second seal member 81 abuts against the tapered surface 65t of the second attachment portion 65. According to this configuration, since the second pressing member 82 presses the second seal member 81 toward the outer pipe 3 side, the outer pipe 3 is fixed to the main body portion 6. At the same time, since the second pressing member 82 presses the second seal member 81 toward the other end side, the second seal member 81 is deformed, preventing leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6.

[0077] Furthermore, in the embodiment described above, the joint 4 includes a third attachment unit 9 into which an outer conduit 5 for introducing the secondary fluid from the supply source of the secondary fluid is inserted and which detachably attaches the outer conduit 5 to the main body portion 6. The main body portion 6 includes a communication hole 63h that opens to the outer peripheral surface 62 of the main body portion 6 and communicates with the through hole 61h, and a third attachment portion 66. The third attachment portion 66 is disposed at the end on the opening side of the communication hole 63h and to which the third attachment unit 9 is attached. When the outer conduit 5 is attached to the main body portion 6, the through hole 61h and the communication hole 63h form the joint internal flow path T. According to this configuration, the unit 1 can introduce the secondary fluid from the supply source and enable precise temperature adjustment of the main fluid flowing through the pipe 2.

[0078] Furthermore, in the embodiment described above, the third attachment portion 66 includes a female screw portion 66i disposed on the cylindrical inner peripheral surface 662. The third attachment unit 9 includes an annular third seal member 91 and a third pressing member 92 that presses the third seal member 91 toward the outer conduit 5 side. The third pressing member 92 includes a male screw portion 92e disposed on the cylindrical outer peripheral surface 921. The third pressing member 92 is attached to the third attachment portion 66 by fitting the female screw portion 66i and the male screw portion 92e. According to this configuration, the third attachment unit 9 is detachably attached to the third attachment portion 66. The outer conduit 5 is detachably attached to the unit 1.

[0079] Furthermore, in the embodiment described above, the third seal member 91 includes a frustoconical outer peripheral surface 911 that tapers toward the opening side of the communication hole 63h. The third pressing member 92 includes a frustoconical inner peripheral surface 922 that expands in diameter toward the through hole 61h side. When the third pressing member 92 is attached to the third attachment portion 66, the outer peripheral surface 911 of the third seal member 91 abuts against the inner peripheral surface 922 of the third pressing member 92. According to this configuration, since the third pressing member 92 presses the third seal member 91 toward the outer conduit 5 side, the outer conduit 5 is fixed to the main body portion 6. At the same time, since the third pressing member 92 presses the third seal member 91 toward the through hole 61h side, the third seal member 91 is deformed, and leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6 is prevented.

[0080] ● Embodiment (2) of the unit ● Another embodiment of the unit described below (hereinafter referred to as "the second embodiment") will be mainly described with respect to the differences from the embodiment of the unit described above (hereinafter referred to as "the first embodiment"). For convenience of explanation, the same members as those in the first embodiment and the members having common functions are given the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.

[0081] The second embodiment is different from the first embodiment in the configuration of the first attachment unit attached to the first attachment portion and the configuration of the second attachment unit attached to the second attachment portion.

[0082] ● Configuration of this unit (2) in the second embodiment FIG. 4 is an enlarged cross-sectional view showing one joint in another embodiment of this unit. FIG. 5 is an exploded enlarged cross-sectional view of one joint.

[0083] The first attachment portion 64 includes a male screw portion 64e disposed on the outer peripheral surface 641.

[0084] The second attachment portion 65 includes a male screw portion 65e and an outer pipe holding portion 65g. The male screw portion 65e is disposed on one end side of the outer peripheral surface 651. The outer pipe holding portion 65g is disposed on the other end side of the outer peripheral surface 651 with respect to the male screw portion 65e.

[0085] The first attachment unit 7 includes a first fixing member 73 and a first seal member 71A.

[0086] The first fixing member 73 surrounds the outer peripheral surface 641 of the first attachment portion 64. The first fixing member 73 includes a ring plate-shaped base portion 731 and a cylindrical portion 732. The cylindrical portion 732 projects from the outer edge portion of the base portion 731 toward the other end side. The cylindrical portion 732 includes a cylindrical inner peripheral surface 733 and a female screw portion 73i disposed on the inner peripheral surface 733.

[0087] The first seal member 71A is annular. The first seal member 71A surrounds the outer peripheral surface 21 of the pipe 2. The first seal member 71A is an O-ring made of an elastic body.

[0088] The first fixing member 73 is attached to the first attachment portion 64 by fitting the male screw portion 64e of the first attachment portion 64 and the female screw portion 73i of the cylindrical portion 732. The first seal member 71A is pressed by the first attachment portion 64, the first fixing member 73, and the pipe 2.

[0089] The second attachment unit 8 includes a second fixing member 83.

[0090] The second fixing member 83 surrounds the outer peripheral surface 651 of the second mounting portion 65. The second fixing member 83 includes a ring plate-shaped base portion 831 and a cylindrical portion 832. The base portion 831 includes an outer pipe pressing portion 83p that abuts against the outer pipe 3 on the inner peripheral surface 833. The cylindrical portion 832 protrudes from the outer edge portion of the base portion 831 toward one end side. The cylindrical portion 832 includes a cylindrical inner peripheral surface 833. The inner peripheral surface 833 includes an internal thread portion 83i.

[0091] The second fixing member 83 is attached to the second mounting portion 65 by fitting the male thread portion 65e of the second mounting portion 65 and the female thread portion 83i of the cylindrical portion 832. The outer pipe holding portion 65g is inserted into the end portion inside the outer pipe 3. The end portion of the outer pipe 3 is pressed between the outer pipe holding portion 65g and the outer pipe pressing portion 83p. Therefore, the outer pipe 3 is attached to the joint 4.

[0092] ● Assembly of this unit (2) The assembly of the unit 1 in the second embodiment will be described below.

[0093] In the following description, FIGS. 4 and 5 are referred to as appropriate.

[0094] First, the outer pipe 3 is attached to the pipe 2.

[0095] Next, the pair of joints 4, 4 are respectively arranged at both end portions of the outer pipe 3. The second mounting unit 8 is arranged at the end portion of the outer pipe 3. The second mounting unit 8 includes the second fixing member 83. The second fixing member 83 includes the base portion 831 and the cylindrical portion 832. Following the outer pipe 3, the second fixing member 83 is inserted into the pipe 2.

[0096] Following the second fixing member 83, the main body portion 6 is inserted into the pipe 2.

[0097] On one end side of the main body portion 6, a first attachment unit 7 is arranged. The first attachment unit 7 includes a first fixing member 73 and a first seal member 71A. Following the main body portion 6, the first seal member 71A is inserted into the pipe 2. Following the first seal member 71A, the first fixing member 73 is inserted into the pipe 2.

[0098] Next, the second attachment portion 65 of the main body portion 6 is inserted into the outer pipe 3. The end of the outer pipe 3 rides over the outer pipe holding portion 65g and is inserted to a predetermined position of the main body portion 6. The outer pipe holding portion 65g is inserted inside the outer pipe 3.

[0099] Next, the second fixing member 83 is attached so as to cover the outer peripheral surface 651 of the second attachment portion 65. The second fixing member 83 is attached to the second attachment portion 65 by fitting the male screw portion 65e of the second attachment portion 65 and the female screw portion 83i of the cylindrical portion 832. At this time, the end of the outer pipe 3 is pressed between the outer pipe holding portion 65g and the outer pipe pressing portion 83p.

[0100] Next, while pushing the first seal member 71A into the inside of the main body portion 6, the first fixing member 73 is attached so as to cover the outer peripheral surface 641 of the first attachment portion 64. The first fixing member 73 is attached to the first attachment portion 64 by fitting the male screw portion 64e of the first attachment portion 64 and the female screw portion 73i of the cylindrical portion 732. At this time, the first seal member 71A is pressed by the first attachment portion 64, the first fixing member 73, and the pipe 2. When the first seal member 71A is deformed, the pipe 2 is fixed to the main body portion 6, and leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6 is prevented.

[0101] ●Summary (2)● In the embodiment described above, the first attachment portion 64 includes a male screw portion 64e disposed on the cylindrical outer peripheral surface 641. The first attachment unit 7 includes a first fixing member 73 that surrounds the outer peripheral surface 641 of the first attachment portion 64, and an annular first seal member 71A. The first fixing member 73 includes a ring plate-shaped base portion 731 and a cylindrical portion 732. The cylindrical portion 732 includes a female screw portion 73i disposed on the cylindrical inner peripheral surface 733. The first fixing member 73 is attached to the first attachment portion 64 by fitting the male screw portion 64e and the female screw portion 73i. The first seal member 71A is pressed by the first attachment portion 64, the first fixing member 73, and the pipe 2. According to this configuration, the first attachment unit 7 is detachably attached to the first attachment portion 64. The present unit 1 is detachably attached to the pipe 2.

[0102] Also, in the embodiment described above, the second attachment portion 65 includes a male screw portion 65e disposed on one end side of the cylindrical outer peripheral surface 651, and an outer pipe holding portion 65g disposed on the other end side of the outer peripheral surface 651 with respect to the male screw portion 65e. The second attachment unit 8 includes a second fixing member 83 that surrounds the outer peripheral surface 651 of the second attachment portion 65. The second fixing member 83 includes a ring plate-shaped base portion 831 and a cylindrical portion 832. The cylindrical portion 832 includes a female screw portion 83i disposed on one end side of the cylindrical inner peripheral surface 833, and an outer pipe pressing portion 83p disposed on the other end side of the inner peripheral surface 833 with respect to the female screw portion 83i and having a reduced diameter compared to the female screw portion 83i. The second fixing member 83 is attached to the second attachment portion 65 by fitting the male screw portion 65e and the female screw portion 83i. The outer pipe holding portion 65g is inserted into the outer pipe 3, and the end portion of the outer pipe 3 is pressed between the outer pipe holding portion 65g and the outer pipe pressing portion 83p. According to this configuration, the second attachment unit 8 is detachably attached to the second attachment portion 65. The outer pipe 3 is detachably attached to the pipe 2.

[0103] ● Embodiment (3) of the present unit ● Another embodiment of the present unit described below (hereinafter referred to as "the third embodiment") will be described centering on the differences from the embodiment of the present unit described above (hereinafter referred to as "the first embodiment"). For convenience of explanation, the same members as those in the first embodiment and the members having common functions are denoted by the same reference numerals as those in the first embodiment, and detailed descriptions thereof are omitted.

[0104] The third embodiment is different from the first embodiment in the configuration of the second mounting unit attached to the second mounting portion. The third embodiment is different from the second embodiment in the configuration of the first mounting unit attached to the first mounting portion and the configuration of the second mounting unit attached to the second mounting portion.

[0105] ● Configuration of the present unit (3) FIG. 6 is an enlarged cross-sectional view showing one joint in still another embodiment of the present unit. FIG. 7 is an exploded enlarged cross-sectional view of one joint.

[0106] The second mounting portion 65 includes an annular groove 653 disposed on the inner peripheral surface.

[0107] The second mounting unit 8 includes an annular second seal member 81A for preventing leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body portion 6. The second seal member 81A is disposed in the annular groove 653 of the second mounting portion 65. The second seal member 81A is an O-ring made of an elastic body. When the outer tube 3 is disposed in the second mounting portion 65, the second seal member 81A is disposed between the outer peripheral surface 31 of the outer tube 3 and the annular groove 653. The second seal member 81A is pressed between the outer peripheral surface 31 of the outer tube 3 and the annular groove 653.

[0108] ● Assembly of the present unit (3) The assembly of the present unit 1 in the third embodiment will be described below.

[0109] In the following description, FIGS. 6 and 7 are appropriately referred to.

[0110] First, the outer pipe 3 is attached to the pipe 2.

[0111] Next, a pair of joints 4, 4 are respectively arranged at both ends of the outer pipe 3. A second attachment unit 8 is arranged at the end of the outer pipe 3. The second attachment unit 8 includes a second seal member 81A. Following the outer pipe 3, the second seal member 81A is inserted into the pipe 2.

[0112] Following the second seal member 81A, the main body 6 is inserted into the pipe 2. The second attachment portion 65 has an annular groove 653 formed on its inner peripheral surface.

[0113] Next, the second seal member 81A is arranged in the annular groove 653.

[0114] Next, the end of the outer pipe 3 is inserted from the second attachment portion 65 into the inside of the main body 6. The end of the outer pipe 3 is inserted to a predetermined position inside the main body 6 while expanding the diameter of the second seal member 81A.

[0115] Next, the second seal member 81A is attached so as to cover the outer peripheral surface 31 of the outer pipe 3. The second seal member 81A is arranged between the outer peripheral surface 31 of the outer pipe 3 and the annular groove 653. At this time, the second seal member 81A is pressed between the outer peripheral surface 31 of the outer pipe 3 and the annular groove 653. When the second seal member 81A is deformed, the outer pipe 3 is fixed to the main body 6, and leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body 6 is prevented.

[0116] ●Summary (3)● In the embodiment described above, the second attachment unit 8 includes an annular second seal member 81A that prevents leakage of the secondary fluid flowing through the joint internal flow path T to the outside of the main body 6. The second attachment portion 65 has an annular groove 653 arranged on its inner peripheral surface. When the outer pipe 3 is arranged at the second attachment portion 65, the second seal member 81A is arranged between the outer peripheral surface 31 of the outer pipe 3 and the annular groove 653 and is pressed between the outer peripheral surface 31 of the outer pipe 3 and the annular groove 653. According to this configuration, the second attachment unit 8 is detachably attached to the second attachment portion 65. The outer pipe 3 is detachably attached to the pipe 2.

[0117] ●Other embodiments of this unit In the present invention, the functional chemical product is not limited to a liquid. That is, the functional chemical product may be, for example, a gas.

[0118] Also, in the present invention, this unit is not limited to heating the main fluid. That is, this unit may, for example, cool the main fluid.

[0119] Furthermore, in the present invention, the flowing direction of the secondary fluid is not limited to the same direction as the flowing direction of the main fluid. That is, the flowing direction of the secondary fluid may be, for example, the opposite direction to the flowing direction of the main fluid.

[0120] ●Features of this unit● The features of this unit described so far are summarized as follows.

[0121] This unit is a pipe heat insulation unit (for example, this unit 1) that thermally insulates the main fluid flowing in a pipe (for example, pipe 2) through the pipe, a cylindrical outer pipe (for example, outer pipe 3) that houses the pipe and forms an internal flow path (for example, internal flow path K) of the pipe body through which the secondary fluid flows between the pipe and the outer pipe, a pair of joints (for example, joint 4) that hold both ends of the outer pipe, and has The joint is a main body part (for example, main body part 6) to which the pipe and the outer pipe are attached to form an internal flow path (for example, internal flow path T) of the joint through which the secondary fluid flows, a first attachment unit (for example, first attachment unit 7) through which the pipe is inserted and detachably attaches the pipe to the main body part, a second attachment unit (for example, second attachment unit 8) through which the pipe is inserted and detachably attaches the outer pipe to the main body part, and includes The main body part is A through hole (61h) that penetrates the main body portion so that the pipe can be inserted therethrough, A first attachment portion (for example, the first attachment portion 64) where one end portion of the through hole is disposed and the first attachment unit is attached, A second attachment portion (for example, the second attachment portion 65) where the other end portion of the through hole is disposed and the second attachment unit is attached, and when the pipe and the outer pipe are attached to the main body portion, the internal flow path of the joint communicates with the internal flow path of the pipe body, characterized in that.

[0122] In this unit, the first attachment portion has a cylindrical inner peripheral surface (for example, the inner peripheral surface 642), and a female screw portion (for example, the female screw portion 64i) disposed on the inner peripheral surface, and the first attachment unit has an annular first seal member (for example, the first seal member 71) that prevents leakage of the secondary fluid flowing through the internal flow path of the joint, and a first pressing member (for example, the first pressing member 72) that is attached to the first attachment portion and presses the first seal member toward the pipe side inside the first attachment portion, and the first pressing member has a cylindrical outer peripheral surface (for example, the outer peripheral surface 721), and a male screw portion (for example, the male screw portion 72e) disposed on the outer peripheral surface, and the first pressing member is attached to the first attachment portion by fitting the female screw portion and the male screw portion, which may be the case.

[0123] In this unit, the first seal member has a frustum-shaped outer peripheral surface (for example, the outer peripheral surface 711) that tapers toward the one end side, and The first pressing member has a frustum-shaped inner peripheral surface (for example, the inner peripheral surface 722) that expands in diameter toward the other end side, and when the first pressing member is attached to the first attachment portion, the outer peripheral surface of the first seal member abuts against the inner peripheral surface of the first pressing member. This may be the case.

[0124] In this unit, the first attachment portion has a cylindrical outer peripheral surface (for example, the outer peripheral surface 641) and a male screw portion (for example, the male screw portion 64e) disposed on the outer peripheral surface, and the first attachment unit has a first fixing member (for example, the first fixing member 73) that surrounds the outer peripheral surface of the first attachment portion and an annular first seal member (for example, the first seal member 71A) that surrounds the outer peripheral surface of the pipe, and the first fixing member has a ring plate-shaped base portion (for example, the base portion 731) and a cylindrical portion (for example, the cylindrical portion 732) that projects from the outer edge portion of the base portion toward the other end side, and the cylindrical portion has a cylindrical inner peripheral surface (for example, the inner peripheral surface 733) and a female screw portion (for example, the female screw portion 73i) disposed on the inner peripheral surface, and by fitting the male screw portion and the female screw portion, the first fixing member is attached to the first attachment portion, and the first seal member is pressed by the first attachment portion, the first fixing member, and the pipe. This may be the case.

[0125] In this unit, the second attachment portion has a cylindrical inner peripheral surface (for example, the inner peripheral surface 652) and The female screw portion (for example, female screw portion 65i) disposed on the inner peripheral surface, and includes, The second mounting unit, An annular second seal member (for example, second seal member 81) that prevents leakage of the secondary fluid flowing through the joint internal flow path, A second pressing member (for example, second pressing member 82) that is attached to the second attachment portion and presses the second seal member toward the outer pipe side inside the second attachment portion, and includes, The second pressing member, A cylindrical outer peripheral surface (for example, outer peripheral surface 821), A male screw portion (for example, male screw portion 82e) disposed on the outer peripheral surface, and includes, The second pressing member is attached to the second attachment portion by fitting the female screw portion and the male screw portion, It may be such.

[0126] In this unit, The second seal member, A frustum-shaped outer peripheral surface (for example, outer peripheral surface 811) that tapers toward the one end side, and includes, The second attachment portion, The female screw portion (for example, female screw portion 65i) disposed on the other end side of the inner peripheral surface, A frustum-shaped tapered surface (for example, tapered surface 65t) disposed on the one end side of the inner peripheral surface and having a diameter that expands toward the other end side, and includes, When the second pressing member is attached to the second attachment portion, the outer peripheral surface of the second seal member abuts against the tapered surface of the second attachment portion, It may be such.

[0127] In this unit, The second attachment portion, A cylindrical outer peripheral surface (for example, outer peripheral surface 651), A male screw portion (for example, male screw portion 65e) disposed on the one end side of the outer peripheral surface, Among the outer peripheral surfaces, an outer tube holding portion (for example, the outer tube holding portion 65g) disposed on the other end side of the male screw portion; is provided with The second attachment unit a second fixing member (for example, the second fixing member 83) surrounding the outer peripheral surface of the second attachment portion; is provided with The second fixing member a ring plate-shaped base portion (for example, the base portion 831); a cylindrical portion (for example, the cylindrical portion 832) protruding from the outer edge portion of the base portion toward the one end side; is provided with The cylindrical portion a cylindrical inner peripheral surface (for example, the inner peripheral surface 833); a female screw portion (for example, the female screw portion 83i) disposed on the one end side of the inner peripheral surface; an outer tube pressing portion (for example, the outer tube pressing portion 83p) disposed on the other end side of the inner peripheral surface with respect to the female screw portion and having a reduced diameter compared to the female screw portion; is provided with By fitting the male screw portion and the female screw portion, the second fixing member is attached to the second attachment portion, The outer tube holding portion is inserted into the end portion of the outer tube, The end portion of the outer tube is pressed between the outer tube holding portion and the outer tube pressing portion. It may be such.

[0128] In this unit, The second attachment unit an annular second seal member (for example, the second seal member 81A) for sealing the joint internal flow path; is provided with The second attachment portion an annular groove (for example, the annular groove 653) disposed on the inner peripheral surface; is provided with The second seal member When the outer tube is disposed on the second attachment portion, the second seal member Disposed between the outer peripheral surface of the outer tube (e.g., the outer peripheral surface 31 of the outer tube) and the annular groove, Pressed between the outer peripheral surface of the outer tube and the annular groove, may be used.

[0129] In this unit, the joint is equipped with a third mounting unit (e.g., the third mounting unit 9) for removably attaching an outer conduit (e.g., the outer conduit 5) for introducing the secondary fluid from the source of the secondary fluid into the main body portion, and includes the main body portion has a communication hole (e.g., the communication hole 63h) that opens to the outer peripheral surface of the main body portion (e.g., the outer peripheral surface 62 of the main body portion) and communicates with the through hole, and a third mounting portion (e.g., the third mounting portion 66) where the end portion on the opening side of the communication hole is disposed and the third mounting unit is attached, and includes When the outer conduit is attached to the main body portion, the communication hole and the through hole form the internal flow path of the joint, which may be used.

[0130] In this unit, the third mounting portion has a cylindrical inner peripheral surface (e.g., the inner peripheral surface 662), and a female screw portion (e.g., the female screw portion 66i) disposed on the inner peripheral surface, and includes the third mounting unit includes an annular third seal member (e.g., the third seal member 91) for preventing leakage of the secondary fluid flowing through the internal flow path of the joint, and a third pressing member (e.g., the third pressing member 92) that presses the third seal member toward the outer conduit side inside the third mounting portion when disposed in the third mounting portion, and includes the third pressing member has a cylindrical outer peripheral surface (e.g., the outer peripheral surface 921), The male screw portion (for example, male screw portion 92e) disposed on the outer peripheral surface, comprising, by fitting the female screw portion and the male screw portion, the third pressing member is attached to the third mounting portion, may be.

[0131] In this unit, the third sealing member, has a frustum-shaped outer peripheral surface (for example, outer peripheral surface 911) that tapers toward the opening side of the communication hole, comprising, the third pressing member, has a frustum-shaped inner peripheral surface (for example, inner peripheral surface 922) that expands in diameter toward the through hole side, comprising, when the third pressing member is attached to the third mounting portion, the outer peripheral surface of the third sealing member abuts against the inner peripheral surface of the third pressing member, may be.

Explanation of Reference Numerals

[0132] 1 Heat-insulating unit for piping 2 Pipe 21 Outer peripheral surface of pipe 3 Outer pipe 31 Outer peripheral surface of outer pipe 4 Joint 5 Outer conduit 6 Body portion 61h Through hole 62 Outer peripheral surface of body 63h Communication hole 64 First mounting portion 641 Outer peripheral surface 642 Inner peripheral surface 64i Female screw portion 64e Male screw portion 65 Second mounting portion 651 Outer peripheral surface 652 Inner peripheral surface 653 Annular groove 65i Female screw portion 65e Male screw portion 65t Tapered surface 65g Outer tube holding part 66 Third mounting part 661 Outer peripheral surface 662 Inner peripheral surface 66i Female screw part 7 First mounting unit 71 First sealing member (71A) 711 Outer peripheral surface 72 First pressing member 721 Outer peripheral surface 722 Inner peripheral surface 72e Male screw part 73 First fixing member 731 Base part 732 Cylindrical part 733 Inner peripheral surface 73i Female screw part 8 Second mounting unit 81 Second sealing member (81A) 811 Outer peripheral surface 82 Second pressing member 821 Outer peripheral surface 822 Inner peripheral surface 82e Male screw part 83 Second fixing member 831 Base part 832 Cylindrical part 833 Inner peripheral surface 83i Female screw part 83p Outer tube pressing part 9 Third mounting unit 91 Third sealing member 911 Outer peripheral surface 92 Third pressing member 921 Outer peripheral surface 922 Inner peripheral surface 92e Male screw part K Inner flow path of the tube body T Inner flow path of the joint

Claims

1. A pipe heat insulation unit for heat-insulating a main fluid flowing in a pipe through the pipe, comprising: a cylindrical outer pipe that houses the pipe and forms an internal flow path for a secondary fluid to flow between the pipe and the outer pipe; a pair of joints that hold both ends of the outer pipe; and having the joint a main body portion to which the pipe and the outer pipe are attached and that forms an internal flow path for the secondary fluid to flow; a first attachment unit through which the pipe is inserted and that detachably attaches the pipe to the main body portion; a second attachment unit through which the pipe is inserted and that detachably attaches the outer pipe to the main body portion; and comprising the main body portion a through hole through which the pipe can be inserted; a first attachment portion where one end of the through hole is disposed and to which the first attachment unit is attached; a second attachment portion where the other end of the through hole is disposed and to which the second attachment unit is attached; and comprising when the pipe and the outer pipe are attached to the main body portion the internal flow path of the joint communicates with the internal flow path of the pipe body; characterized in that the pipe heat insulation unit.

2. The first attachment portion has a cylindrical inner peripheral surface; and a female thread portion disposed on the inner peripheral surface; and comprising the first attachment unit an annular first seal member that prevents leakage of the secondary fluid flowing through the internal flow path of the joint; and a first pressing member that is attached to the first attachment portion and presses the first seal member toward the pipe side inside the first attachment portion; and comprising the first pressing member has a cylindrical outer peripheral surface; and a male thread portion disposed on the outer peripheral surface; and comprising by fitting the female thread portion and the male thread portion, the first pressing member is attached to the first attachment portion; The pipe heat insulation unit according to Claim 1.

3. The first seal member has a frustoconical outer peripheral surface that tapers toward the one end side; and comprising the first pressing member has a frustoconical inner peripheral surface that expands in diameter toward the other end side; and comprising when the first pressing member is attached to the first attachment portion, the outer peripheral surface of the first seal member abuts against the inner peripheral surface of the first pressing member; The pipe heat insulation unit according to Claim 2.

4. The first attachment portion has a cylindrical outer peripheral surface; and a male thread portion disposed on the outer peripheral surface; and comprising the first attachment unit a first fixing member that surrounds the outer peripheral surface of the first attachment portion; and an annular first seal member that surrounds the outer peripheral surface of the pipe; and comprising the first fixing member A ring plate-shaped base portion, a cylindrical portion protruding from the outer edge portion of the base portion toward the other end side, and comprising the cylindrical portion has a cylindrical inner peripheral surface, and a female screw portion disposed on the inner peripheral surface, and comprising by fitting the male screw portion and the female screw portion, the first fixing member is attached to the first attachment portion, the first seal member is pressed by the first attachment portion, the first fixing member, and the pipe. The heat-insulating unit for pipes according to claim 1.

5. The second attachment portion has a cylindrical inner peripheral surface, and a female screw portion disposed on the inner peripheral surface, and comprising the second attachment unit comprises an annular second seal member for preventing leakage of the secondary fluid flowing through the joint internal flow path, and a second pressing member attached to the second attachment portion and pressing the second seal member toward the outer pipe side inside the second attachment portion, and comprising the second pressing member has a cylindrical outer peripheral surface, and a male screw portion disposed on the outer peripheral surface, and comprising by fitting the female screw portion and the male screw portion, the second pressing member is attached to the second attachment portion, The heat-insulating unit for pipes according to claim 1.

6. The second seal member has a frustum-shaped outer peripheral surface that tapers toward the one end side, and comprising the second attachment portion comprises the female screw portion disposed on the other end side of the inner peripheral surface, and a frustum-shaped tapered surface disposed on the one end side of the inner peripheral surface and expanding in diameter toward the other end side, and comprising when the second pressing member is attached to the second attachment portion, the outer peripheral surface of the second seal member abuts against the tapered surface of the second attachment portion. The heat-insulating unit for pipes according to claim 5.

7. The second attachment portion has a cylindrical outer peripheral surface, a male screw portion disposed on the one end side of the outer peripheral surface, and an outer pipe holding portion disposed on the other end side of the outer peripheral surface relative to the male screw portion, and comprising the second attachment unit comprises a second fixing member surrounding the outer peripheral surface of the second attachment portion, and comprising the second fixing member has a ring plate-shaped base portion, and a cylindrical portion protruding from the outer edge portion of the base portion toward the one end side, and comprising the cylindrical portion has a cylindrical inner peripheral surface, a female screw portion disposed on the one end side of the inner peripheral surface, and an outer pipe pressing portion disposed on the other end side of the inner peripheral surface relative to the female screw portion and having a diameter smaller than that of the female screw portion, and comprising by fitting the male screw portion and the female screw portion, the second fixing member is attached to the second attachment portion, The outer pipe holding portion is inserted into the end portion of the outer pipe, The end portion of the outer pipe is pressed between the outer pipe holding portion and the outer pipe pressing portion, The heat insulation unit for pipes according to claim 1.

8. The second mounting unit, An annular second sealing member for sealing the joint internal flow path, Comprising, The second mounting portion, An annular groove disposed on the inner peripheral surface, Comprising, The second sealing member, When the outer pipe is disposed in the second mounting portion, the second sealing member, Is disposed between the outer peripheral surface of the outer pipe and the annular groove, Is pressed between the outer peripheral surface of the outer pipe and the annular groove, The heat insulation unit for pipes according to claim 2.

9. The joint, A third mounting unit for removably attaching an outer conduit for introducing the secondary fluid from the source of the secondary fluid to the main body portion, Comprising, The main body portion, A communication hole that opens on the outer peripheral surface of the main body portion and communicates with the through hole, A third mounting portion where the end portion on the opening side of the communication hole is disposed and the third mounting unit is attached, Comprising, When the outer conduit is attached to the main body portion, The communication hole and the through hole form the joint internal flow path, The heat insulation unit for pipes according to claim 1.

10. The third mounting portion, A cylindrical inner peripheral surface, A female screw portion disposed on the inner peripheral surface, Comprising, The third mounting unit, An annular third sealing member for preventing leakage of the secondary fluid flowing through the joint internal flow path, When disposed in the third mounting portion, a third pressing member that presses the third sealing member toward the outer conduit side inside the third mounting portion, Comprising, The third pressing member, A cylindrical outer peripheral surface, A male screw portion disposed on the outer peripheral surface, Comprising, By fitting the female screw portion and the male screw portion, the third pressing member is attached to the third mounting portion, The heat insulation unit for pipes according to claim 9.

11. The third sealing member, A frustum-shaped outer peripheral surface that tapers toward the opening side of the communication hole, Comprising, The third pressing member, A frustum-shaped inner peripheral surface that expands in diameter toward the through hole side, Comprising, When the third pressing member is attached to the third mounting portion, the outer peripheral surface of the third sealing member abuts against the inner peripheral surface of the third pressing member, The heat insulation unit for pipes according to claim 10.

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