JPH10122438A - Treatment tank provided with tube installing structure in joint system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a plastic tube for heat exchanging on a seal plate easily and in a condition in which high sealing performance is inhibited, and improve reliability of a reaction tank. SOLUTION: A socket 13 is fixed to a seal plate 10 by a screw 21. The circumferential surface of the socket 13 is welded to the seal plate 10. A sleeve 14 is fitted around an end part of a tube 6, a tube end is invaded outward, and the sleeve 14 is covered therewith so as to form a seal part 33. The sleeve 14 is housed in a seal chamber 19 in the socket 13. An union 15 is screwed into the seal chamber 19 through a screw 22. The seal part 33 and the sleeve 14 are held by a seal recessed part of a screwing start end inner surface of the union 15 and the socket 13, and the seal part 33 is compressed and deformed. A tool 16 for restricting rotation of a bolt and the like, is screwed into the socket 13 so as to prevent looseness of the union 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in the process of manufacturing chemical products such as chemical fibers and chemicals and intermediate products thereof, and has a reaction vessel and a heating vessel having a heat exchange tube in the vessel. The present invention relates to a processing tank such as a cooling tank, a plating tank, etc., in which a tube end mounting structure is improved.

[0002]

2. Description of the Related Art In this type of processing tank, it is essential that both the tank body and the tube have chemical resistance. For example, the inner surface of the tank body is lined with a fluorine resin sheet having excellent chemical resistance. The heat exchange tube is made of a fluororesin. The end of this tube is attached to a seal plate fixed to an entrance or exit of the tank body or a reducer, and in many cases, the seal plate is also formed of a fluororesin.

[0003] There are several forms of the conventional mounting structure of the tube to the seal plate. The connecting hole is passed through the seal plate, and the outer surface of the tube inserted into the connecting hole is welded to the seal plate from the outer surface side. It is expanded and deformed into a flange shape, and this expanded deformed part is clamped and fixed with a seal plate and a holding plate that is bolted to it, so to speak, a so-called clamping joint method, and a fluorine resin joint is attached to the tube end, and this joint is attached. A method of screwing into the seal plate from the inner side, so to speak, is a joint method.

[0004]

The tube mounting structure of the welding type can provide a considerable degree of reliability against liquid leakage and gas leakage from the mounting portion, but the welding operation is troublesome, and the tube is difficult to use. The disadvantage is that it cannot be replaced if it has deteriorated or been damaged. Since the sealing state is maintained only at the welded portion, there is a disadvantage that the sealing performance tends to vary depending on the skill level of the operator.

In the sandwiching and joining method, the tubes can be freely replaced and inspected. However, when a large number of tubes are connected to the seal plate, the fixing force of the mounting portion is apt to vary, and liquid leakage from the mounting portion or the like is difficult. It is difficult to obtain sufficient reliability against gas leakage. Since a group of tubes is sandwiched and fixed by a single holding plate and a seal plate, it is necessary to attach and detach the holding plate every time each tube is replaced, and the work for replacement and inspection is troublesome.

[0006] The joint type mounting structure makes it possible to easily replace individual tubes, and to reliably and easily mount the tubes to the seal plate without causing a difference in skill. The problem is that the thread of the joint is apt to be loosened due to the cold flow phenomenon peculiar to fluororesin, which causes a small gap between the joint and the tube, or between the joint and the seal plate, causing liquid leakage and gas leakage. The biggest drawback is the inviting, or lack of reliability.

SUMMARY OF THE INVENTION An object of the present invention is to ensure that a heat exchange tube is securely attached to a seal plate without causing a liquid leak or a gas leak, and a high degree of reliability can be obtained with respect to a sealing action at a tube mounting portion. Another object of the present invention is to provide a processing tank having a joint type tube mounting structure. Another object of the present invention is a joint-type tube mounting structure in which a tube for heat exchange can be replaced or inspected for each tube, and anyone can surely mount the tube to a seal plate. It is to provide a processing tank provided with. Another object of the present invention is to reduce the spacing between tubes when a large number of tubes are mounted on a seal plate, which is advantageous for reducing the size of a reducer or header adjacent to the seal plate. An object of the present invention is to provide a processing tank having a joint type tube mounting structure.

[0008]

According to the present invention, a heat exchange tube 6 made of a plastic tube having chemical resistance is arranged inside a tank body 1 and both ends of the tube 6 are connected to the tank body 1. Seal plate 10 fixed to pipe outlet 8
First, it is assumed that the processing tanks are mounted via fittings of a joint type. The mounting fixture includes a seal plate 10.
A socket 13 screwed into and fixed to the socket 13 from the outer surface side, and a union 15 screwed and connected to the socket 13 in a separable manner.
The socket 13 and the union 1 housed in the socket 13
And a sleeve 14 clamped and fixed between the sleeve 5 and the sleeve 5. Tube 6 inserted into socket 13 from the side of seal plate 10
Of the tube 6 is sealed and connected with a sleeve 14 which is in close contact with the inner or outer surface of the tube 6. At least a part of the socket 13 is welded to the seal plate 10, and the union 15 is fastened and fixed to the socket 13 by the stopper 16.

More specifically, the insertion end of the tube 6 is turned outward to form a seal portion 33, and the seal portion 33 and the sleeve 14 mounted on the inner surface of the seal portion 33 are connected to the socket 13 and the union. 15 and fix it. Tube 6
Are sealed and connected by a sleeve 14 and a union 15.

A sleeve 14 having a swelling portion 38 having a diameter larger than the inner diameter of the tube 6 is internally fitted to the insertion end of the tube 6, and the sleeve 6 and the tube 6 circumscribing the swelling portion 38. Is fixed between the socket 13 and the union 15. Similarly, the tube 6 is sealed and connected by the sleeve 14 and the union 15.

A sleeve 14 having a sealing surface 43 whose diameter is smaller than the outer diameter of the tube 6 is externally fitted to the insertion end of the tube 6, and the sleeve 14 is clamped and fixed between the socket 13 and the union 15. Similarly, the tube 6 is sealingly connected to the inner surface of the sleeve 16.

The socket 13 is screwed and fastened with the seal plate 10 penetrating the seal plate 10 in and out.
Is welded to the seal plate 10 on the inner and outer surfaces. The rotation stopper 16 is formed of a bolt, and the rotation stopper 16 is inserted through an operation flange 24 projecting in the middle of the union 15, and is screwed and fixed in a screw hole 23 provided at an end of the socket 13. Each of the socket 13, the union 15, and the seal plate 10 is formed of a fluororesin.

[0013]

【Example】

(Embodiment 1) FIGS. 1 to 5 show an embodiment of a tube mounting structure according to the present invention. In FIG. 2, reference numeral 1 denotes a tank main body of the reaction tank, and 2 denotes a heat exchanger housed in the tank main body 1.

The heat exchanger 2 forms a support frame with a cylindrical baffle 4 arranged at the center of the tank body 1 and eight to nine tube sheets 5 radially arranged on the peripheral surface of the baffle 4. A group of tubes 6 introduced into the tank from a tube outlet (not shown) at the lower part of the main body 1 is wound around a support frame. The baffle 4 is fixedly supported by several supports fixed to the tank body 1. A large number of flow holes pass through the cylindrical wall.
The tube sheet 5 is formed of a vertically long rectangular plate, and its upper and lower edges are supported by brackets 7 fixed to the baffle 4. A group of holes is provided through the plate surface of the tube sheet 5, and the tubes are wound along the peripheral surface of the baffle 4 while passing through the individual tubes 6.

A group of tubes 6 made of fluororesin
Is led out of the tank via a pipe outlet 8 provided on one upper side of the tank body 1 and a reducer 9 connected to the pipe outlet 8.
Seal plate 10 fixed to the open end of reducer 9
Then, it is attached via a joint type attachment. The outer surface of the seal plate 10 is covered and sealed with a header-11. The heat exchange medium in the tube 6, for example, water as a refrigerant, flows from the lower part of the tank body 1 to the part of the heat exchanger 2 and gradually moves to the upper stage while circling along the baffle 4. The processing liquid contained in the tank is cooled. The processing liquid is stirred by a stirring blade (not shown) as necessary.

3 and 4, the fixture is a socket 13 mounted on a seal plate 10 and a socket 13
, A union 15 screwed and connected to the socket 13, and a rotation stopper 16 (see FIG. 1). Reference numeral 17 in FIG. 3 denotes a backup plate formed of an alloy steel having high corrosion resistance.

The socket 13 is formed in a multi-stage cylindrical shape.
On its inner surface, a seal chamber 19 and a tube insertion hole 20 having a smaller diameter than this are formed vertically adjacent to each other. A screw 21 made of a taper screw for a pipe is formed on the peripheral surface of the shaft portion in the middle stage, and a female screw 22 b is formed on the inner peripheral surface of the seal chamber 19. Further, a screw hole 23 is provided on the upper end surface of the socket 13. This screw hole 2
As shown in FIG. 5, six 3 are provided at regular intervals along the peripheral edge of the end face. The reason will be described later.

The sleeve 14 has an upper receiving wall 14a formed of a cylindrical wall and a tapered wall 14b extending toward the lower end through a step at the lower end of the receiving wall 14a. 1
The inside diameter of the tube 4 is set to be the same as the outside diameter of the tube 6. The upper end of the receiving wall 14a is rounded in a semicircular cross section to receive the inverted base of the tube 6.

The union 15 has an operation flange 24 formed in a square shape in a plan view. Shafts are provided on the upper and lower sides of the operation flange 24, and a taper screw for pipe is provided on a peripheral surface of the upper shaft. A male screw 25 is formed, and a male screw 22a corresponding to the female screw 22b of the seal chamber 19 is formed on the lower peripheral surface of the shaft. The pair of screws 22 a and 22 b constitute a screw 22 for connecting the union 15 to the socket 13. The inside of the union 15 is vertically penetrated by an upper opening 26 and a seal concave portion 27 opened on the lower surface side. The diameter of the passage 26 is set to the same size as the inner diameter of the tube 6.

The seal concave portion 27 is provided to press the seal portion 33 at the end of the tube in cooperation with the sleeve 14. For this purpose, the outer peripheral surface of the receiving wall 14a is formed to have a similar cross-sectional shape which is slightly larger. The arc surface at the upper end is the opening 26
Is provided so as to be located above the lower opening edge. The tapered wall 1 of the sleeve 14 is provided at the opening edge of the lower end of the sealing recess 27.
4b is provided with a tapered surface 28 closely fitted to the outside. Stopper 1
6 is a hexagon socket head bolt, and the insertion hole 29 for this is
It passes through one corner of the operation flange 24. The socket 13, sleeve 14 and union 15 are each formed of a plastic material having high chemical resistance and heat resistance, for example, polytetrafluoroethylene, perfluoroalkoxy, or another fluororesin.

The seal plate 10 is made of a disk made of the same material as the socket 13, and socket holes 31 of the number of the tubes 6 (several tens) are radially provided on the plate surface. The socket hole 31 is formed in a multistage shape with a screw hole corresponding to the screw 21 of the socket 13 and a support hole in which the lower shaft portion of the socket 13 fits closely. In FIG. 3, reference numeral 32 denotes a packing.

From the outer surface side of the seal plate 10,
By screwing the socket 13 into the socket hole 31,
The socket 13 is fixed to the seal plate 10. In the screwed state, the lower end of the lower shaft portion of the socket 13 projects toward the inner surface of the seal plate 10. The entire periphery of the projecting portion is welded to the seal plate 10, and the lower periphery of the upper shaft portion is welded to the outer surface of the seal plate 10. This is to prevent the socket 13 from loosening due to the cold flow phenomenon. In addition, each welding part is shown by the code | symbol W in FIG.

When attaching the tube 6, the tube 6
Is inserted into the socket 13 from the tube insertion hole 20 side. Next, the sleeve 14 is fitted over the end of the tube,
Both are held and fixed by a jig (not shown), and the tube end is turned outward to form a seal portion 33. Seal part 3
3 is in close contact with the receiving wall 14a of the sleeve 14, and
The tube wall which is continuous with the inner wall comes into close contact with the inner surface of the receiving wall 14a (see FIG. 1).

After the sleeve 14 in this state is accommodated in the seal chamber 19 of the socket 13, the union 15 is moved to the seal chamber 1.
Screw into 9. As the union 15 is screwed in, the seal recess 27 is fitted to and tightly attached to the seal portion 33, and the seal portion 33 and the sleeve 14 are pressed between the union 15 and the socket 13. When the union 15 is sufficiently screwed, the taper wall 14b of the sleeve 14 and the taper surface 28 of the union 15 come into close contact with each other. Therefore, the sleeve 14 is concentric with the union 15 and receives the clamping force acting on the seal portion 33 from the inner surface side. That is, the seal portion 38 is pressed inward and outward, deforms in the thickness direction, and
a and the seal concave portion 27, and exerts a sufficient sealing action. Thereafter, the union 15 is retightened to fit the insertion hole 29
Is positioned right above the nearest screw hole 23, and the rotation stopper 16 passed through the insertion hole 29 is screwed into the screw hole 23 to fix the union 15 so that it cannot be loosened. Insertion hole 29 at this time
The six screw holes 23 are provided in order to facilitate the positioning.

When the cap 6 in the form of a cap nut is screwed into the male screw 25, the tube 6 can be closed. If the tube 6 is broken inside the tank body 1 for any reason, it is convenient to take emergency measures. . Alternatively, the male thread 25 can be used to connect the inspection equipment to the union 15 when inspecting the individual tubes 6.

(Embodiment 2) FIG. 6 shows an embodiment in which a part of the embodiment 1 is modified. There, a concentric inner cylinder wall 35 and an outer cylinder wall 36 are provided on the union 15, and a female screw 22 b is formed on the inner surface of the outer cylinder wall 36. Correspondingly, a male screw 22a is formed on the peripheral surface of the upper shaft portion of the socket 13, and both screws 22a,
At 22b, a screw 22 for connecting the union 15 is formed. The inner cylinder wall 35 is fitted in the seal chamber 19 to form the seal portion 3.
3 is pinched. Stopper 1 for preventing union 15 from loosening
Reference numeral 6 denotes a spring pin, which is driven into the outer shaft wall 36 and the upper shaft portion of the socket 13. Of course, a bolt may be screwed between the both 13 and 36. Other parts are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals and description thereof will be omitted. The same applies to the following embodiments.

(Embodiment 3) In this embodiment, as shown in FIG. 7, on the outer surface of the lower half of the sleeve 14, a ball-shaped bulging portion 38 having a diameter larger than the inner diameter of the tube 6 is provided. Bulge 3
8 is fitted with the insertion end of the tube 6. Then,
The sleeve 14 is placed in the seal chamber 19, and the union 15 is screwed into the socket 13 to clamp and fix the sleeve 14.
The tube 6 is sealed at the inner bottom opening edge of the tube insertion hole 20 on the seal chamber 19 side.
Sealing is also performed at the seal portion 33 that contacts the par surface 39.

(Embodiment 4) In this embodiment, as shown in FIG. 8, the sleeve 14 is formed in a short cylindrical shape, and tapered sealing surfaces 40, 41 are provided on the upper and lower surfaces of the sleeve. The tube 6 is sandwiched between the sealing surfaces 40 and 41 and the taper surface 42 of the socket 13 and the taper surface 39 of the union 15 which are provided corresponding to the sealing surfaces 40 and 41 so as to be sealed and connected.

(Embodiment 5) In this embodiment, the sleeve 1
4 is externally fitted to the tube 6 to seal it. For this purpose, as shown in FIG. 9, a seal surface 43 having a diameter smaller than the outer diameter of the tube 6 is provided on the upper half of the inner surface of the cylindrical sleeve 14.
A tapered skirt wall 44 is provided in the lower half of the sleeve 14 so as to extend downward. When the union 15 is screwed into the socket 13, the skirt wall 44 is pressed against the taper surface 39 and comes into close contact with the tube 6. Further, the upper end of the sleeve 14 is elastically deformed to have a reduced diameter so that the sleeve 14 comes into close contact with the tube 6. as a result,
The peripheral wall of the tube 6 is deformed inward and outward so as to be in close contact with the sleeve 14.

(Embodiment 6) The attachment of this embodiment is basically the same as that of Embodiment 5, but as shown in FIG. 10, the lower sleeve 4 in which the sleeve 14 can be received by the socket 13.
5 and an upper sleeve 46 pressed by the union 15. When the unions 15 are screwed into the socket 13 after the sleeves 45 and 46 are fitted to the tube 6, the sealing surface 43 of the upper sleeve 46 comes into close contact with the tube 6.

In addition to the above, the tube 6 can be formed of a plastic tube other than a fluororesin, depending on the processing liquid contained in the tank body 1. When the number of tubes is small, the reducer 9 can be omitted and the seal plate 10 can be attached to the pipe outlet 8. Socket 13 is
Welding may be performed only on one of the inside and outside of the seal plate 10, and it is not always necessary to perform welding on the entire circumference.

[0032]

According to the present invention, after the sleeves 14 for sealing are mounted on the tube 6, these are sealed with the seal plate 1.
The tube 6 was sealed and connected to the seal plate 10 by being sandwiched between a socket 13 fixed to 0 and a union 15 screwed into the socket 13. Further, at least a part of the peripheral surface of the socket 13 was welded to the seal plate 10 and the union 15 was fixed with the stopper 16 to prevent the socket 13 and the union 15 from loosening due to the cold flow phenomenon. Thereby, the tube 6 is connected to the seal plate 1.
Thus, a highly reliable processing tank can be obtained that can be securely attached to the tube and does not cause liquid leakage or gas leakage from the tube mounting portion for a long period of time.

The sockets 13 corresponding to the individual tubes 6
And the union 15 are provided, so that the tube 6 can be easily replaced and inspected, and the assembly and re-attachment of the tube 6 can be performed by anyone without regard to the skill level of the worker. This is advantageous in that the maintenance work of can be simplified. Union 15 and socket 13
Most of the headers are outside the seal plate 10, that is, the temperature and pressure conditions are milder than those inside the reaction tank.
Since it is located inside 11, the deterioration of the union 15 and the socket 13 due to heat and high pressure can be suppressed, and the durability thereof can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a tube mounting structure.

FIG. 2 is a schematic sectional view of a reaction tank.

FIG. 3 is a sectional view of a main part of a seal plate.

FIG. 4 is a partially cutaway front view showing the attachment in an exploded state.

FIG. 5 is a sectional view taken along line AA in FIG. 1;

FIG. 6 is a cross-sectional view illustrating a fixture according to a second embodiment.

FIG. 7 is a cross-sectional view illustrating a fixture according to a third embodiment.

FIG. 8 is a cross-sectional view illustrating a fixture according to a fourth embodiment.

FIG. 9 is a cross-sectional view illustrating a mounting tool according to a fifth embodiment.

FIG. 10 is a cross-sectional view illustrating a fixture according to a sixth embodiment.

[Explanation of symbols]

1 ... tank body, 6 ... tube, 8 ... pipe outlet, 10 ... seal plate, 13 ... socket,
14 ... Sleep, 15 ... Union, 16 ...
Stopper, 19 ... Seal chamber, 20 ... Tube insertion hole, 21 ... Screw (13/10), 22 ... Screw (15/13), 33 ... Seal part, W ... …… Welding place.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenichi Honbo 4-3-131 Kitaeguchi, Higashiyodogawa-ku, Osaka-shi

Claims (7)

[Claims] A heat exchange tube made of a plastic tube having chemical resistance is disposed inside a tank body, and both ends of the tube are fixed to a pipe outlet of the tank body. A processing tank attached to the plate 10 via a fitting of a joint type, wherein the fitting is detachably screwed and connected to the socket 13 screwed and fixed to the seal plate 10 from the outer surface side. The union 15 includes a sleeve 14 housed in the socket 13 and held between the socket 13 and the union 15, and the insertion end of the tube 6 inserted into the socket 13 from the side of the seal plate 10 is At least a part of the socket 13 is sealed and connected by a sleeve 14 in close contact with the inner surface or the outer surface of the tube 6.
And the union 15 is fixed to the socket 13 with the rotation stopper 16.
A treatment tank provided with a joint-type tube mounting structure that is fastened and fixed to the tub. 2. A seal portion 33 is formed by inverting the insertion end of the tube 6 outward, and the seal portion 33 and the seal portion 3 are formed.
2. A joint type tube according to claim 1, wherein the sleeve mounted on the inner surface of the tube is clamped and fixed by the socket and the union, and the tube is sealed and connected by the sleeve and the union. Processing tank with mounting structure. 3. A sleeve 14 having a swelling portion 38 having a diameter larger than the inner diameter of the tube 6 is fitted inside the insertion end of the tube 6, and the sleeve 14 and the swelling portion 38 are fitted to the sleeve 14. The sealing portion 33 of the tube 6 to be circumscribed is clamped and fixed between the socket 13 and the union 15 so that the tube 6 is connected to the sleeve 14.
The processing tank provided with the joint-type tube mounting structure according to claim 1, wherein the processing tank is sealed and connected with the union 15. 4. A sleeve 14 having a sealing surface 43 having a smaller diameter than the outer diameter of the tube 6 is externally fitted to the insertion end of the tube 6, and the sleeve 14 is connected by the socket 13 and the union 15. 2. A processing tank provided with a joint type tube mounting structure according to claim 1, wherein the tube is sealed and connected to the inner surface of the sleeve by clamping and fixing. 5. The socket 13 is screwed and fastened in a state penetrating the seal plate 10 in and out, and the inner peripheral surface and the outer peripheral surface of the seal plate 10 are entirely welded to the seal plate 10. 2,
A processing tank comprising the joint type tube mounting structure according to 3 or 4. 6. The locking member 16 is formed of a bolt. The locking member 16 is inserted through an operation flange 24 projecting in the middle of the union 15 and screwed into a screw hole 23 provided at an end of the socket 13. Certain claims 1, 2, 3, 4 or 5
A processing tank provided with the tube mounting structure of the joint method described in the above. 7. A process provided with a joint type tube mounting structure according to claim 1, wherein each of the socket 13, the union 15, and the seal plate 10 is formed of a fluororesin. Tank.