JPH0960779A - Flexible joint with check valve function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible joint with a check valve function having a compact structure and capable of saving space by using the flexible joint concurrently as the check valve, or using the flexible joint concurrently as a silencer absorbing a water hammer action and the pressure pulsation of a pump in addition to the check valve. SOLUTION: A flexible joint section 8 is made of elastic rubber reinforced by reinforcing core wires, and its main body section is formed into a conical shape. A release preventing porous plate 12 is fitted to a large-diameter flange section 10 on the water feed side of the flexible joint section 8, a circular check valve seat 13 is arranged on the inside of the small-diameter flange section 11 of the flexible joint section 8, and a check valve ball 9 is stored in the flexible joint section 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint with a check valve function.

[0002]

2. Description of the Related Art FIG. 11 shows a general piping structure around a pump. The pump 1 driven by the motor 2 is connected to the pipes 4 and 4a through the flexible joints 3 and 3a. Reference numeral 5 is a check valve, and 6 is a sluice valve. In such a piping structure, when the flexible joint 3 for absorbing the vibration or the thermal expansion of the building equipment piping arranged between the pump 1 and the gate valve 6 and the water supply device are stopped, The check valves 5 for preventing the suction action and the like due to the pressure reduction were separate bodies.

[0003]

According to the present invention, the flexible joint 3 and the check valve 5 in such a conventional piping structure are used together, or the flexible joint and the check valve are used together, and further a water hammer action and a pump are provided. It is an object of the present invention to provide a flexible joint with a check valve function, which has a compact structure and can save space, while also having a silencer function of absorbing pressure pulsation.

[0004]

A flexible joint portion 8 made of elastic rubber reinforced by a reinforcing core wire and having a conical main body portion, and a large-diameter flange portion 10 of the flexible joint portion 8 on the water feeding side. The detachable perforated plate 12 is attached, and the small diameter flange portion 1 of the flexible joint portion 8 is attached.
1 has an annular check valve sheet 13 inside, and a check valve ball 9 inside the flexible joint 8.

A flexible joint portion 16 made of elastic rubber reinforced by a reinforcing core wire, which is composed of an annular portion 17 having an arcuate cross section in the central portion, and cylindrical portions 18 connected to both sides of the annular portion 17, and the flexible joint. The insertion tube 21 having a length half that of the flexible joint section 16 attached to the non-return side of the section 16
Reference numeral 1 is composed of a cylindrical portion and an end plate 23, and has a check valve body inside.
2 has a water passage hole 22 in the side and bottom of the cylindrical portion, and an end plate 23 has a central hole 24 through which water can be blocked by a check valve ball 25.

A flexible joint portion 26, which is made of elastic rubber reinforced by a reinforcing core wire and has a main body portion having an annular portion 28 having an arcuate cross section at the center portion and cylindrical portions 27, 27 connected to both sides of the annular portion 28, The flexible joint portion 26
Of the insertion pipe 31 attached to the non-return side of the flexible joint part 26 and having a length slightly shorter than that of the flexible joint part 26. The insertion pipe 31 includes a bottomless cylindrical portion 31a and an end plate 35. The ball 34 is built in, and the cylindrical portion 31
Water passage holes 3 provided in a at intervals substantially equal to the width of the annular portion 28.
2a and 32b are provided on the peripheral surface, and a check valve button is provided on the end plate 35.
It has a central hole 36 that can block the water flow by the nozzle 34.

A flexible joint portion 45, which is made of elastic rubber reinforced by a reinforcing core wire, has a main body portion having an annular portion 39 having an arcuate cross section at a central portion and cylindrical portions 44, 44 connected to both sides of the annular portion 39. The flexible joint portion 45
Of the insertion pipe 37 attached to the non-return side of the flexible joint portion 45 and having a length slightly shorter than that of the flexible joint portion 45. The insertion pipe 37 has a plurality of water passages at positions corresponding to the annular portion 39 on the side surface of the cylindrical portion. Bottomless cylindrical portion 37 having hole 40
a and an end plate 37b having a central hole 36 capable of blocking water flow by the check valve ball 41, and the check valve ball 41 is built in the cylindrical portion 37a. End plate 37b
And a ball stop plate 42 having a plurality of openings 43 provided on the water supply side of the flexible joint portion 45.

The insertion pipe was installed obliquely, and the built-in check valve ball was always biased toward the end plate by its own weight.

An elastic rubber reinforced by a reinforcing core wire, which is composed of an annular portion 49a having an arcuate cross section at a central portion and a flexible joint portion 49 composed of cylindrical portions 49b and 49b connected to both sides of the annular portion 49a. The interior of the portion 49a is obliquely partitioned by a guide partition 50, a check valve ball 51 is built in the upper check side of the guide partition 50, and a cylindrical portion 49b on the ball 51 and the check side. The provided check valve sheet 52 constitutes a check valve.

[0010]

1 is a sectional view of a flexible joint with a check valve function (hereinafter referred to as a check valve joint) 7 according to the present invention. The check valve joint 7 comprises a flexible joint portion 8 made of elastic rubber and a check valve ball 9. The flexible joint portion 8 has a conical shape with a large diameter portion on the water supply side, and has a large diameter flange portion 1 at one end.
0, and has a small diameter flange portion 11 at the other end. A perforated plate 12 is attached to the large-diameter flange portion 10 to prevent the ball 9 from coming off. A large number of holes 12a are formed in the perforated plate 12. Also, small diameter flange 11
A check valve sheet 13 having an arcuate cross section and formed in an annular shape is provided in the inner diameter portion on the side.

The flexible joint portion 8 is made of elastic rubber, has a reinforcing core material 14 made of synthetic resin fiber, and has a steel wire 15 on the large diameter flange portion 10 or the small diameter flange portion 11.
Reinforcing core material 14 made of synthetic resin fiber surrounding this
And (FIG. 2). By having this reinforcing core material, it is possible to have ^both a pressure resistance of 20 kg / cm ² and a heat resistance of 80 ° C. The shape of the flexible joint portion 8 is generally a conical shape as shown in FIG. 1 or 3 (a), but as shown in FIG. 3 (b), the large diameter portion and the small diameter portion may be eccentric.

FIG. 4 shows a flexible joint having a check valve function and a silencer function (hereinafter referred to as a check / silencer joint). In this case, the flexible joint portion 16 is not conical, but the cylindrical portions 18 on both sides,
18 and an annular portion 17 having an arcuate cross section in the middle thereof. A flange 19 is provided at the end of the cylindrical portion 18. The flange 19 is connected to the pipe connection flange 20.

The cylindrical portion 1 of the flexible joint portion 16
A cylindrical insertion tube 21 concentric with the insertion tube 21 is inserted in the tube 8. The insertion tube 21 is composed of a cylindrical portion and an end plate 23, has a water passage hole 22 on the side surface and the end surface of the cylindrical portion, and has an end plate fitted to the outer surface of the flange portion 19 of the flexible joint portion 16 on the inlet side end surface. 23 is attached. 24 is a central hole for water flow. A check valve ball 25 is loosely fitted in the insertion tube 21. This ball 25
The central hole 24 provided in the end plate 23 is opened and closed by. The end of the insertion tube 21 ends at the central position of the annular portion 17.

With this construction, the elasticity of the flexible joint portion 16 constitutes a flexible joint, and the check pipe is constituted by the insertion pipe 21 and the check valve ball 25 inside. The presence of the annular portion 17 constitutes a silencer portion which absorbs the water hammer action and the pressure pulsation of the pump due to the expansion of the water discharged from the hole 22 of the insertion pipe 21.

FIG. 5 shows another embodiment of the non-return silencer joint. Similar to FIG. 4, the flexible joint portion 26 is composed of cylindrical portions 27, 27 on both sides and an annular portion 28 sandwiched between them and having an arcuate cross section. A flange 29 is provided at the end of the cylindrical portion 27. This flange 29 is connected to the pipe connection flange 30.

A cylindrical insertion tube 31 concentric with the flexible joint portion 26 is inserted into the flexible joint portion 26. The side body of the insertion tube 31 is provided with two rows of holes 32a and holes 32b in a cylindrical shape at intervals in the annular portion 28 having an arcuate cross section. A ball stopper 33 is provided near the hole 32b to prevent the check valve ball 34 from coming off. An end plate 35 having a central hole 36 is attached to the inlet side of the insertion tube 31, and this is attached to the outer surface of the flange 29.

The water flowing in from the center hole 36 of the insertion pipe 31 pushes away the check valve ball 34, pushes the ball 34 against the ball stopper 33, and closes the insertion pipe 31. Then, it flows out from the hole 32a, goes out to the annular portion 28, then flows again into the insertion pipe 31 from the hole 32b, and is discharged from the other end of the flexible joint portion 26. When the reverse pressure is applied, the ball 34 closes the central hole 36 to form a check valve.

With this structure, the elasticity of the flexible joint portion 26 forms a flexible joint,
The insertion pipe 31 and the ball 34 inside constitute a check valve. Further, due to the presence of the annular portion 28, the hole 3 of the insertion pipe 31
The expansion of the water discharged from 2a provides a water hammer effect and a silencer function of absorbing pressure pulsation of the pump.

FIG. 6 shows still another example of the non-return silencer joint. In this embodiment, the construction of the insertion tube 37 is different from that in the case of FIG. Insert tube 37
Has a non-return end plate 38 having a central hole 36 at the inlet,
A plurality of holes 40 are equidistantly arranged at the center of the annular portion 39 at the intermediate position. The ball 41 in the insertion tube 37 is sealed by a ball stop plate 42 on the water supply side, and this stop plate is attached to the water supply side flange of the flexible joint portion. The ball stop plate 42 has a large number of openings 43.

With such a construction, the elasticity of the flexible joint portion constitutes a flexible joint, and the insertion pipe 37 and the check valve ball 41 constitute a check valve. Further, due to the existence of the annular portion 39, the hole 4 of the insertion pipe 37
The expansion of the water generated from 0 constitutes a silencer that absorbs the water hammer effect and the pressure pulsation of the pump.

FIG. 9 is a sectional view of the check valve balls 25, 34, 41. These balls are hollow and made of hard vinyl chloride.
Made of stainless steel or stainless steel, it has corrosion resistance / heat resistance (up to 100 ° C) and pressure resistance (up to 20 kg / cm ² ).

In the embodiments shown in FIGS. 4, 5 and 6, all the insertion pipes 21, 31 and 37 were horizontal. In FIG. 7, the insertion pipe 46 is obliquely provided. By doing so, the check valve ball 4 can be provided without backflow.
7 is always urged toward the end plate 48 by its own weight. And by making the specific gravity of the ball 47 larger than water,
When a check valve is needed, the ball 47 is always attached to the end plate 4.
Since the valve is biased toward 8, the check valve functions extremely quickly, and a check valve having excellent responsiveness can be obtained.

Further, as shown in FIG. 8, a flexible joint portion 49 having an annular portion 49a having an arcuate cross section is integrally provided with an oblique guide partition 50 instead of an insertion pipe, and a check valve body is provided thereon. As shown in FIG. 7, the valve 51 has a built-in valve 51 and is urged toward the check valve sheet 52 provided on the check side, so that the valve 51 has excellent responsiveness. Flexible joint with stop valve function can be obtained.

FIG. 10 shows a piping system having a conventional flexible joint and a check valve (FIG. 10 (a)) and a piping system having a flexible joint according to the present invention (FIG. 10).
10 (b) and FIG. 10 (c)) are compared. (a) is connected to the pump P, which is connected to the pipe via a suction side flexible joint, and is connected to the pump via a discharge side flexible joint, a check valve, and a gate valve. On the other hand, (b)
Is a pipe from the pump P through the non-return / silencer joint of the present invention, and (c) is also a pipe through a flexible joint with a check valve function. As is clear from the figure, the check valve, the flexible joint, and the silencer are also used as the silencer, but the installation space can be made smaller than in the conventional case.

[0025]

According to the invention of claim 1, a flexible joint can be obtained by a flexible joint portion made of elastic rubber and having a conical shape, and at the same time, an annular check valve seal provided on a small diameter portion of the conical shape. A check valve can be obtained with the check valve ball. That is, it is possible to obtain a flexible joint having two functions in a compact structure.

According to the second aspect of the present invention, the flexible joint portion is constituted by the central annular portion and the cylindrical portions on both sides thereof, and the insertion pipe having the check valve ball built therein from the check side. I put it on. With this structure, the check valve ball and the center hole of the insertion pipe perform the function of the check valve, and the hole provided on the side of the insertion pipe and the annular portion perform the silencer function by the expansion of the liquid. Can be made.

According to the third aspect of the present invention, the flexible joint portion is constituted by the central annular portion and the cylindrical portions on both sides thereof, and the insertion pipe having the check valve ball built therein from the check side. I put it on. With this structure, the check valve ball and the central hole of the insertion pipe perform the function of the check valve, and the hole provided in the cylindrical portion of the insertion pipe and the annular portion perform the silencer function by the expansion of the liquid. Can be made.

In the invention of claim 4, the flexible joint portion is composed of an annular portion in the central portion and cylindrical portions on both sides thereof, and an insertion pipe incorporating a check valve ball from the check side. I put it on. With this structure, the check valve ball and the central hole of the insertion pipe perform the function of the check valve, and the hole provided in the cylindrical portion of the insertion pipe and the annular portion perform the silencer function by the expansion of the liquid. Can be made.

According to the fifth aspect of the invention, since the check valve ball is urged toward the end plate, the check valve can be operated with extremely high responsiveness when the function of the check valve is required. .

In the invention of claim 6, since the flexible joint part is partitioned obliquely and the ball is built in the upper part thereof, the responsiveness is excellent and the structure can be simplified as in the case of claim 5. .

[Brief description of drawings]

FIG. 1 is a first example of a flexible joint with a check valve function, (a) is a sectional view, (b) is a side view of a water supply side, and (c) is a side view of a check side.

FIG. 2 is a sectional view of a flexible joint.

FIG. 3 shows a modified example of a flexible joint, (a) shows a concentric type, and (b) shows an eccentric type.

FIG. 4 shows a flexible joint with a check valve function with a silencer function, where (a) is a sectional view and (b) is a sectional view.
Is a side view of the non-return side.

5A and 5B show another example having the same function as in FIG. 4, in which FIG. 5A is a sectional view and FIG.

6A and 6B show still another example having the same function as in FIG. 4, in which FIG. 6A is a sectional view, FIG. 6B is a water supply side, and FIG.

FIG. 7 shows another embodiment in which the insertion pipe is obliquely installed.

FIG. 8 shows an embodiment in which a guide partition is provided in the flexible joint portion and an insertion pipe is omitted.

FIG. 9 is a sectional view of the ball.

FIG. 10 shows a comparative example of piping between the conventional type and the present invention.

FIG. 11 is a perspective view showing a general piping structure around a pump.

[Explanation of symbols]

1 Pump 2 Motor 3 Flexible Joint 4 Piping 5 Check Valve 6 Gate Valve 7 Flexible Joint with Check Valve Function (Check Valve Joint) 8 Flexible Joint 9 Ball for Check Valve 10 Large Diameter Flange 11 Small diameter flange 12 Perforated plate (for ball stop) 12a Hole 13 Check valve seat 14 Reinforcement core 15 Steel wire 16 Flexible joint 17 Annular part 18 Cylindrical part 19 Flange 20 Piping connection flange 21 Insertion pipe 22 Hole 23 End plate 24 Center hole 25 Check valve ball 26 Flexible joint part 27 Cylindrical part 28 Annular part 29 Flange 30 Piping connection flange 31 Insertion pipe 32a, 32b Hole 33 Ball stop 34 Check valve ball Rule 35 End plate 36 Center hole 37 Insert pipe 37a Cylindrical part 37b End plate 38 End plate 39 Annular part 40 hole 41 Check valve ball 42 Ball stop plate 43 Opening 44 Cylindrical part 45 Flexible joint part 46 Insert pipe 47 Reverse Valve for ball - le 48 end plate 49 flexible joint portion 49a annular portion 49b cylindrical portion 50 board for guiding partition 51 check valve - le 52 Gyakutomebenshi - DOO

Claims (6)

[Claims] 1. A flexible joint part made of elastic rubber reinforced by a reinforcing core wire, and having a conical main body part.
(8) and the perforated plate (12) for preventing the detachment from being attached to the large diameter flange (10) on the water supply side of the flexible joint (8),
The flexible joint (8) has an annular check valve seat (13) inside the small diameter flange (11), and the check valve ball (9) inside the flexible joint (8). Flexible joint with built-in check valve function. 2. A flexible body made of elastic rubber reinforced by a reinforcing core wire, which is composed of an annular portion (17) having an arc-shaped cross section at a central portion and cylindrical portions (18, 18) connected to both sides of the annular portion (17). It comprises a joint part (16) and an insertion pipe (21) having a length of about 1/2 of the flexible joint part (16) mounted on the non-return side of the flexible joint part (16).
(21) consists of a bottomed cylindrical part and an end plate (23), a check valve ball (25) is built inside, and a water passage hole (22) is provided on the side and bottom of the cylindrical part. In addition, a flexible joint having a check valve function and a silencer function, which has a central hole (24) in the end plate (23) for blocking water flow by the check valve ball (25). 3. An annular part (28) made of elastic rubber reinforced with a reinforcing core, the main body of which has a circular arc-shaped cross section at the center and the annular part (28).
A flexible joint portion (26) consisting of cylindrical portions (27, 27) connected to both sides of the flexible joint portion (26)
The insert pipe (31) attached to the non-return side of the flexible joint part (26) and having a length slightly shorter than the flexible joint part (26), the insert pipe (31) having a bottomless cylindrical part (31a) and the end plate (35). ) And a check valve ball (34) inside, and a cylindrical part (31
Water passage holes provided in a) at intervals approximately equal to the width of the annular portion (28).
(32a, 32b) on the peripheral surface, and a check valve ball on the end plate (35).
A flexible joint having a check valve function and a silencer function, which has a central hole (36) capable of blocking water flow due to (34). 4. An annular portion (39) made of elastic rubber reinforced by a reinforcing core, the main body of which has a circular arc-shaped cross section at the center and the annular portion (39).
Flexible joint part (45) consisting of cylindrical parts (44, 44) connected to both sides of the flexible joint part (45)
The insertion pipe (37) attached to the non-return side of the flexible joint part (45) and having a length slightly shorter than the flexible joint part (45), and the insertion pipe (37) corresponds to the annular part (39) on the side surface of the cylindrical part. Bottomless cylindrical part (37) with a plurality of water passage holes (40)
Central hole that can block water flow with a) and check valve ball (41)
(36) with an end plate (37b), the check valve ball (41) is built in the cylindrical portion (37a), the ball is an end plate (37b)
A flexible joint having a check valve function and a silencer function surrounded by a ball stop plate (42) having a plurality of openings (43) provided on the water supply side of the flexible joint section (45). 5. The check valve function according to claim 2, 3 or 4, wherein the insertion pipe is obliquely provided, and the built-in check valve ball is constantly urged toward the end plate by its own weight. And a flexible joint that has a silencer function. 6. A flexible structure made of elastic rubber reinforced by a reinforcing core wire, which is composed of an annular portion (49a) having an arc-shaped cross section in the central portion and cylindrical portions (49b, 49b) connected to both sides of the annular portion (49a). The joint part (49) and the annular part (49a) are diagonally partitioned by the guide partition (50), and the check valve ball (51) is provided on the upper check side of the guide partition (50). And a check valve function and a silencer function that constitute a check valve by the ball (51) and a check valve sheet (52) provided on the check side cylindrical portion (49b). A flexible joint that has.