JP3665847B2 - Structure that seals the connection end of the synthetic resin tube in an airtight or liquid tight manner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure in which a connecting end portion of a synthetic resin pipe is hermetically or liquid-tightly sealed in order to connect a synthetic resin pipe in which a fluid is circulated to a connected body.
[0002]
[Prior art]
Conventionally, when connecting a synthetic resin pipe to another pipe, a joint such as an elbow joint or a branch joint (so-called header), or a connected body such as a faucet, the connecting end of the synthetic resin pipe is airtight or Various structures have been devised as the liquid-tight sealing structure. For example, there is a structure disclosed in Japanese Utility Model Publication No. 3-5751. As shown in FIG. 9, when connecting the synthetic resin pipe to the connected body such as a steel pipe, the joint body connected to the connected body in an airtight or liquid-tight manner and the connecting end of the synthetic resin pipe A metal short tube inserted inside the portion, a metal packing formed in a so-called abacus bead shape in which the central portion bulges and shrinks toward both ends, and is attached to the outside of the synthetic resin tube, and this metal packing And a nut that plastically deforms and connects the synthetic resin pipe to the joint main body in an airtight or liquid-tight manner. According to such a sealing structure, even a synthetic resin pipe having inferior strength can be hermetically or liquid-tightly sealed at its connection end.
[0003]
[Problems to be solved by the invention]
However, the conventional seal structure has the following problems.
[0004]
First, the joint body and the synthetic resin tube are hermetically sealed or liquid-tight by plastic deformation of the metal packing, but the metal packing does not always deform uniformly in the circumferential direction over the entire circumference of the inner and outer diameters. In other words, the airtightness or liquid tightness in the circumferential direction varies. In the case of high-pressure piping, there is a possibility that leakage will occur from a portion having low airtightness or liquid tightness due to this variation.
[0005]
Secondly, it is preferable that the inner diameter of the metal packing is slightly larger than the outer diameter of the synthetic resin tube to be inserted, but these dimensions vary due to accuracy errors and the like. Here, if the inner diameter of the metal packing is smaller than the outer diameter of the synthetic resin tube, the metal packing cannot be inserted into the synthetic resin tube. Further, if the inner diameter of the metal packing is too larger than the outer diameter of the synthetic resin tube, it is impossible to ensure reliable airtightness or liquid tightness. Therefore, high dimensional accuracy is required for the outer diameter of the synthetic resin tube and the inner diameter of the metal packing.
[0006]
Thirdly, in order to plastically deform the metal packing, the joint body, the nut, and the short metal tube need to have a strength higher than that of the metal packing, and these cannot be formed of, for example, a synthetic resin.
[0007]
Fourthly, since the metal packing is plastically deformed once used, it cannot be used again, and the synthetic resin pipe once connected to the joint body has a metal packing plastically deformed at the end. Therefore, in order to remove the synthetic resin pipe from the joint body and reconnect it, the end portion must be cut to form a new end portion and a new metal packing must be used.
[0008]
Each of the present inventions has been made to solve the above-mentioned problems, and the object of the present invention is to provide uniform airtightness or liquidtightness over the entire outer periphery of the synthetic resin pipe connected to the connected body. Can be ensured, and does not require high-precision dimensions such as the outer diameter of the synthetic resin tube, and the member used for connection can be formed of a material such as synthetic resin. It is to provide a structure for sealing a connection end portion of a synthetic resin pipe that can be used repeatedly in an air-tight or liquid-tight manner with a simple structure.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the means employed by the present invention will be described with reference numerals used in the drawings.
“In order to connect the synthetic resin pipe B in which a fluid is circulated to the connected body A, the connection end of the synthetic resin pipe B is hermetically or liquid-tightly sealed,
A sleeve 10 having a connecting end portion abutting the collar portion 11 of the inserted inside the connection end portion of the synthetic resin pipe B Rutotomoni the synthetic resin tube B, helically wound to become the connecting end portion A coil member 20 mounted on the outside, and a compression member 30 mounted on the outside of the coil member 20 to reduce the diameter of the coil member 20,
It said compression member 30 is, I bisected two split cylindrical body der to be formed into a cylindrical shape circumferentially, to one end of the cylindrical body, engaged with the flange portion 11 of the sleeve 10 the A protrusion 31 for preventing the movement of the compression member 30 is provided, and a protrusion 32 for preventing the coil member 20 from coming out is provided at the other end of the cylindrical body, and the inner surface corresponds to the extension of the coil member 20. structure for sealing the connection end portion of the synthetic resin tube B, wherein Rukoto to have a space in an airtight or liquid-tight "
It is.
The invention of claim 2
“In order to connect the synthetic resin pipe B in which a fluid is circulated to the connected body A , the connection end of the synthetic resin pipe B is hermetically or liquid-tightly sealed,
A sleeve 10 having a connecting end portion abutting the collar portion 11 of the inserted inside the connection end portion of the synthetic resin pipe B Rutotomoni the synthetic resin tube B, helically wound to become the connecting end portion comprising a coil member 20 which is mounted outside, and a compression member 30 to reduce the diameter of the coil member 20 is mounted on the outside of the coil member 20,
Said compression member 30 in cross section I formed cylindrical body Der substantially C-shape, one end portion of the cylindrical body, the movement of the compression member 30 engages a flange portion 11 of the sleeve 10 Rukoto projection 31 is provided to prevent the other end portion of the cylindrical body, the protrusion 32 is provided to prevent the escape of the coil member 20, which on the inner surface, having a space corresponding to the elongation of the coil member 20 A structure in which the connection end of the synthetic resin tube B is hermetically or liquid tightly sealed. "
It is.
[0010]
Next, the invention of claim 3
“The coil member 20 is sharply formed on the inner side, and the connection end portion of the synthetic resin tube B according to claim 1 or 2 is hermetically or liquid-tightly sealed”.
It is.
[0011]
Next, the invention of claim 4
The connecting end of the synthetic resin pipe B according to any one of claims 1 to 3, wherein the coil member 20 is configured to expand when the diameter reduction by the compression member 30 is released. Structure that seals airtight or liquid tightly ”
It is.
[0012]
Next, the invention of claim 5
The sleeve 10 is formed integrally with the body A to be connected, and the connection end of the synthetic resin pipe B according to any one of claims 1 to 4 is hermetically or liquid-tightly sealed. Structure to do "
It is.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a structure for sealing the connection end portion of the synthetic resin pipe B according to the present invention in an airtight or liquid tight manner will be described in detail with reference to the drawings. In each of the following examples, an example in which the synthetic resin pipe B is connected to another pipe such as a steel pipe is shown. However, the present invention is not limited thereto, and other pipes for branching the pipe into a plurality of pipes, for example. In addition, a joint such as an elbow joint or a branch joint (so-called header) or a faucet or the like is used as a body A to be connected, and this can be applied when the synthetic resin pipe B is connected to the body A to be connected.
[0017]
FIG. 1 shows an example of an embodiment of a seal structure according to the present invention. One end side of the sleeve 10 is formed to have an outer diameter slightly smaller than the inner diameter of the connected body A such as a steel pipe, and the sleeve 10 is inserted into the connected body A and connected to it in an airtight or liquid-tight manner. Here, an O-ring 40 is mounted between the connected body A and the sleeve 10, and airtightness or liquid-tightness between the connected body A and the sleeve 10 is ensured. Further, the connected body A is provided with two pin holes 51 which are formed from the side surface of the connected body A and exposed to the inner surface of the connected body A on the end side of the mounting portion of the O-ring 40. In the outer surface of the sleeve 10, a groove 12 is provided at a portion corresponding to the pin hole 51. Then, as shown in FIG. 2, the groove 12 of the sleeve 10 is locked by inserting a locking pin 50 bent in a substantially U shape into the two pin holes 51 from the side surface of the connected body A. The pin 50 is locked and the sleeve 10 is prevented from being detached from the connected body A. A recess 52 is provided between the two pin holes 51 on the outer surface of the connected body A, and a locking pin 50 inserted into the pin hole 51 is inserted into the recess 52 with a tool such as a minus driver. It can be easily removed by pulling it out.
[0018]
On the other hand, the other end side of the sleeve 10 is fitted inside the synthetic resin tube B. Here, the outer peripheral surface of the sleeve 10 is formed in a sawtooth shape in cross section so that the sleeve 10 is not easily detached from the synthetic resin tube B. A flange 11 is provided at the center of the sleeve 10. The flange portion 11 functions as a stopper of the synthetic resin tube B inserted into the other end side of the sleeve 10 and functions as a movement prevention of the compression member 30 as will be described later.
[0019]
A coil member 20 that is spirally wound is attached to the outside of the synthetic resin tube B into which the sleeve 10 is inserted. Here, the coil member 20 is formed by winding a wire having a trapezoidal cross section, and the inner side is sharply formed as in the invention of claim 2. In order to sharpen the inside of the coil member 20, not only using a trapezoidal cross-section wire, but also using a wire with a triangular cross-section or a wire with a partly sharp cross-section, these wires, What is necessary is just to wind so that a sharp side may become an inner side.
[0020]
The coil member 20 is formed of a spring steel material or a synthetic resin excellent in restoring force. As in the invention of claim 3, when the reduced diameter by the compression member 30 described later is released, the restoring force causes It is configured to expand to its original shape. When such a coil member 20 is employed, for example, when the synthetic resin tube B connected to the connected body A is removed and reconnected, the coil member 20 once used for connection is removed from the synthetic resin tube B. It can be easily removed, and the removed coil member 20 can be used again.
[0021]
A compression member 30 that compresses the coil member 20 in the circumferential direction is mounted on the outer side of the coil member 20. By the compression by the compression member 30, the coil member 20 is reduced in diameter to tighten the synthetic resin tube B in the circumferential direction, and the sleeve 10 and the synthetic resin tube B are firmly and airtightly or liquid tightly connected. Here, since the diameter of the coil member 20 is uniformly reduced in the circumferential direction, the synthetic resin tube B is uniformly tightened over the entire outer periphery, and therefore the airtightness between the sleeve 10 and the synthetic resin tube B or Liquid tightness is uniform in the circumferential direction. Further, since the inside of the coil member 20 is sharply formed as described above, the coil member 20 bites into the outer surface of the synthetic resin tube B and is firmly attached, and reliable airtightness or liquid tightness is obtained.
[0022]
By the way, it is preferable that the inner diameter of the coil member 20 is slightly larger than the outer diameter of the synthetic resin tube B. However, since the coil member 20 itself can be enlarged or reduced in diameter, the inner diameter of the coil member 20 is made of synthetic resin. Even if it is smaller than the outer diameter of the tube B, the coil member 20 can be securely attached to the synthetic resin tube B by expanding the diameter of the coil member 20. Even if the inner diameter of the coil member 20 is larger than the outer diameter of the synthetic resin tube B, the coil member 20 is reduced in diameter in accordance with the compression force by the compression member 30. The resin tube B can be securely tightened.
[0023]
The shape of the compression member 30 is not particularly limited as long as it can compress the coil member 20 in the circumferential direction and reduce the diameter of the coil member 20. cylinder, for example, as shown in FIG. 3, the cylindrical body or two split which is bisected is formed into a cylindrical shape in the circumferential direction, as shown in FIG. 4, the cross-sectional surface is formed into a substantially C-shaped Examples include the body. For example, as shown in the figure, such a compression member 30 is contracted in the circumferential direction by tightening a screw 33 to reduce the diameter of the coil member 20. Among such compression members 30, the compression member 30 as shown in FIG. 3 is divided into two in the circumferential direction. Therefore, when connecting the synthetic resin tube B to the body A, the synthetic resin tube B is previously connected. There is no need to attach, and the attachment workability to the synthetic resin tube B is excellent. Since the compression member 30 as shown in FIG. 4 has a substantially C-shaped cross section, when the compression member 30 is tightened, the entire circumferential direction is reduced due to the blockage of the C-shaped notch. Excellent tightening workability.
[0024]
3 and 4, protrusions 31 and 32 projecting inward are provided at both end portions of the compression member 30. As shown in FIG. 1, first, the protrusion 31 on one end side is a groove formed by the end portion of the connection body A and the flange portion 11 of the sleeve 10 when mounted on the outside of the coil member 20. This is for preventing inadvertent movement from the mounting portion of the compression member 30. Then, the protrusion 32 on the other end side closes the gap between the synthetic resin tube B and the compression member 30 and prevents the coil member 20 from inadvertently coming out of the compression member 30. Since the entire length of the coil member 20 slightly extends due to the reduced diameter, the compression member 30 has a space on the inner surface thereof that can sufficiently accommodate the elongation of the coil member 20.
[0025]
FIG. 5 shows another example of the embodiment of the seal structure according to the present invention. As in the invention of claim 4, the sleeve 10 is integrally formed at the end of the connected body A such as a steel pipe, and the synthetic resin pipe B is formed on the sleeve 10 and the coil member 20 and the compression member as described above. 30 is firmly and airtight or liquid tightly connected. In this way, by forming the sleeve 10 integrally with the connected body A, it is possible to ensure firm integrity and airtightness or liquid tightness between the connected body A and the sleeve 10. Further, the connection work between the connected body A and the sleeve 10 can be omitted, and the connection work between the connected body A and the synthetic resin tube B can be simplified. In this example, a compression member 30 such as a split cylinder as shown in FIG. 3 or a compression member 20 such as a C-shaped cylinder as shown in FIG. 4 is employed. Therefore, a groove is formed between the synthetic resin pipe A and the sleeve 10 formed integrally with the synthetic resin pipe A to lock the projection 31 on one side of the compression member 30 and functions as a stopper for the synthetic resin pipe B to be connected. A flange portion 11 is provided.
[0026]
FIG. 6 shows still another example of the above embodiment. This is a compression member 30, a female screw 34 on one end side inner surface, and a nut having a tapered surface 35 whose diameter decreases at the other end to the other end inner surface. Thus, by using the compression member 30 as a nut, the diameter of the coil member 20 can be easily reduced by tightening the nut, and the connection work between the connected body A and the synthetic resin tube B can be simplified. . In this example, the sleeve 10 formed separately from the connected body A such as a steel pipe is adopted, and the connected body A and the sleeve 10 are connected in an air-tight or liquid-tight manner via the O-ring 40. However, the sleeve 10 may be integrally formed at the end of the connected body A as in the invention of claim 4 described above. Further, in this example, an example is shown in which a male screw 36 to be engaged with the female screw 34 of the compression member 30 is provided on the outer surface of the end of the connected body A, and the compression member 30 is screwed to the connected body A. However, the present invention is not limited to this. For example, a male screw 36 may be provided on the flange portion 11 of the sleeve 10 and the compression member 30 may be screwed onto the sleeve 10.
[0027]
Figure 7 shows a modification Katachirei, reduced in diameter coil member 20 by forcibly exterior to the tubular compression member 30 having a tapered surface 35 on the inner surface to cover the outer periphery of the coils members 20 After that, the holding member 37 is mounted on the outer periphery of the compression member 30 and the female screw 34 thereof is screwed to the male screw 36 of the connected body A to connect the synthetic resin tube B to the connected body A and the compression member. 30 may be prevented from being pulled out .
[0028]
Finally, FIG. 8 shows still another example of the embodiment of the seal structure according to the present invention. In the sealing structure as shown in FIG. 1 described above, concave portions 13 and 38 in which the coil member 20 is accommodated are provided in the outer peripheral portion of the sleeve 10 and the inner peripheral portion of the compression member 30, respectively. Thus, if the recessed part 38 which accommodates the coil member 20 in the compression member 30 is provided, the accommodation of the coil member 20 with respect to the inner surface of the compression member 30 will become favorable, and the full length of the coil member 20 will extend too much carelessly, and the full length direction It is possible to prevent uneven tightening force from occurring. When the concave portion 13 for accommodating the coil member 20 is provided in the sleeve 10, not only does the coil member 20 fit into the sleeve 10, but the sleeve 10 and the coil member 20 are sandwiched at the gap portion of the concave portion 13. The formed synthetic resin tube B is bent, and the sleeve 10 and the synthetic resin tube B are firmly fixed.
[0029]
【The invention's effect】
According to the present inventions configured as described above, the following effects can be obtained.
[0030]
First, since the synthetic resin tube is tightened by compressing the coil member wound spirally in the circumferential direction to reduce the diameter, a uniform tightening force can be obtained in the circumferential direction of the synthetic resin tube. Uniform air-tightness or liquid-tightness can be ensured over the entire outer periphery of the resin tube.
[0031]
Secondly, since the coil member itself can be expanded and contracted, the coil member can be securely attached to the synthetic resin tube even if the inner diameter of the coil member is smaller than the outer diameter of the synthetic resin tube. In addition, even if the inner diameter of the coil member is too larger than the outer diameter of the synthetic resin tube, the synthetic resin tube can be securely tightened by the coil member, and high dimensional accuracy is not required for the synthetic resin tube or the coil member.
[0032]
Third, because the coil member can be reliably reduced in diameter even with a slight compressive force of the compression member, members such as sleeves and compression members are also formed of a synthetic resin having a lower strength than a metal such as steel. It is economical and has excellent mass productivity.
[0033]
In particular, according to the inventions of claims 2 to 5 , the following effects can be obtained.
[0034]
First, according to the invention of claim 2, since the inside of the coil member is sharply formed, when the diameter of the coil member is reduced, the inside of the coil member bites into the outer periphery of the synthetic resin tube and is firmly attached, The air tightness or liquid tightness between the sleeve and the synthetic resin tube can be improved.
[0035]
Next, according to the invention of claim 3, even if the coil member is used once, if the compression by the compression member is released, the coil member expands its diameter by its own restoring force. The coil member and the synthetic resin tube can be used again.
[0036]
Next, according to the invention of claim 4, since the sleeve is integrally formed on the connected body, the airtightness or liquid-tightness between the connected body and the sleeve can be secured, Since the connection work between the connecting body and the sleeve can be omitted, the work of connecting the synthetic resin pipe to the connected body can be simplified.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view showing an example of a seal structure according to the present invention.
FIG. 2 is a perspective view showing an insertion state of a locking pin.
FIG. 3 is a perspective view showing an example of a compression member used in the invention of claim 1 ;
4 is a perspective view showing an example of a compression member used in the invention of claim 2. FIG.
5 is a cross-sectional side view showing an example of a seal structure according to the invention of claim 4. FIG.
6 is a cross-sectional side view showing another example of the seal structure of FIG . 1 ;
7 is a cross-sectional side view showing a modification of the seal structure of FIG.
8 is a cross-sectional side view showing still another example of the seal structure of FIG . 1. FIG.
FIG. 9 is a sectional side view showing a conventional seal structure.
[Explanation of symbols]
A Connected Body B Synthetic Resin Tube 10 Sleeve 11 Gutter 12 Groove 13 Recess 20 Coil Member 30 Compression Member 31 Protrusion 32 Protrusion 33 Screw 34 Female Screw 35 Tapered Surface 36 Male Screw 37 Taper Member 38 Recess 40 O Ring 50 Locking Pin 51 Pin hole 52 Recess

Claims (5)

In order to connect a synthetic resin pipe through which a fluid is circulated to a connected body, the connection end of the synthetic resin pipe is hermetically or liquid-tightly sealed,
A connection end portion of the inserted inside the connection end portion of the synthetic resin pipe Rutotomoni the synthetic resin tube and a sleeve having a contact with the flange portion is mounted on the outside of the connection end portion becomes wound helically A coil member, and a compression member that is attached to the outside of the coil member to reduce the diameter of the coil member,
It said compression member, I bisected two split cylindrical body der to be formed into a cylindrical shape circumferentially, to one end of the cylindrical body, of the compression member engaged with the flange portion of the sleeve protrusions to prevent movement is provided at the other end of the cylindrical body, the protrusion is provided to prevent the escape of the coil member, the inner surface, characterized Rukoto to have a space corresponding to the elongation of the coil member The connection end of the synthetic resin tube is sealed airtight or liquid tightly. In order to connect a synthetic resin pipe through which a fluid is circulated to a connected body, the connection end of the synthetic resin pipe is hermetically or liquid-tightly sealed,
A connection end portion of the inserted inside the connection end portion of the synthetic resin pipe Rutotomoni the synthetic resin tube and a sleeve having a contact with the flange portion is mounted on the outside of the connection end portion becomes wound helically A coil member, and a compression member that is attached to the outside of the coil member to reduce the diameter of the coil member,
It said compression member in cross section I formed cylindrical body Der substantially C-shape, one end portion of the cylindrical body, engaged with the flange portion of the sleeve projection to prevent movement of the compression member provided, at the other end of the cylindrical body, the protrusion is provided to prevent the escape of the coil member, the inner surface, the synthetic resin tube, wherein Rukoto to have a space corresponding to the elongation of the coil member A structure that seals the connection end in an air-tight or liquid-tight manner.   The structure for sealing the connection end of the synthetic resin pipe according to claim 1 or 2 in an airtight or liquid tight manner, wherein the coil member is sharply formed on the inner side.   The coil member is configured to expand when the diameter reduction by the compression member is released, or the connection end of the synthetic resin pipe according to any one of claims 1 to 3, wherein the coil member is airtight or Liquid-tight sealing structure. Structure sleeve, to seal airtightly or liquid-tightly connecting end of the synthetic resin tube according to any one of claims 1 to 4, characterized in that it is integrally formed on the object to be connected.

Images