JP3516180B2 - Fluid coupling and connection method thereof - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid coupling and a connecting method thereof, and is used as a joint for supplying a fluid, for example, fire-fighting water used in a fire. . [0002] A conventional water supply joint comprises a water supply joint and an intake joint connected to the water supply joint. [0003] The conventional water supply joint has the following problems. (1) When connecting the water supply joint and the intake joint, they must be firmly fixed using a support.
Therefore, the work of attaching and detaching the two becomes troublesome, and the equipment cost also increases. (2) A packing is interposed between the contact surfaces of the two joints to prevent water leakage. However, when this packing gets old, water leakage occurs,
Must be replaced. In addition, maintenance of the packing is troublesome because the degree of deterioration of the packing must be monitored. In view of the above circumstances, an object of the present invention is to make it possible to easily and reliably attach and detach a fluid coupling. Another purpose is to facilitate maintenance and inspection. According to the present invention, a contact surface of a supply tube and a contact surface of a receiving tube are brought into contact with each other, and the reduced discharge port of the supply tube and the receiving tube are provided. A fluid coupling communicating with a receiving port of the body, wherein a suction unit communicating with the discharge port and the receiving port is provided between a contact surface of the supply pipe and a contact surface of the receiving pipe; A fluid switch provided on the supply pipe or the receiving pipe with a microswitch that operates a control switch of a pump when a contact surface of the supply pipe and a contact surface of the reception pipe come into contact with each other; , To achieve the above object. The contact surface of the receiving pipe and the contact surface of the supply pipe are brought into contact with each other, so that the discharge port of the supply pipe and the receiving port of the receiving pipe communicate with each other. When pressure fluid is supplied to the supply tube, the pressure fluid is throttled at the outlet and the pressure energy is converted to velocity energy. Then, the fluid flows into the receiving port, is converted into pressure energy again in the receiving pipe, and is discharged. At this time, the fluid pressure in the vicinity of the discharge port and the receiving port is remarkably reduced and becomes negative pressure, so that the inside of the suction part also becomes negative pressure.
Therefore, the contact surface of the supply pipe and the contact surface of the receiving pipe strongly attract each other, and the two pipes are firmly connected and integrated. A first embodiment of the present invention will be described with reference to FIG. The fluid coupling 10 includes a supply pipe 20 and a receiving pipe 30. The supply passage 23 of the supply tube 20 is formed to have a diameter D, but the tip is narrowed down and has a truncated conical cross section. The diameter d of the discharge port 21 is greatly reduced as compared with the diameter D. The ratio d / D of the two diameters is appropriately determined as needed, and for example, d / D is selected to be 1/5. A flange 22 is provided at the tip of the supply pipe 20. The distal end surface of the supply pipe 20 is a contact surface 24.
However, the contact surface 24 is formed smooth and perpendicular to the axis C. The receiving pipe 30 is provided with a receiving passage 33, which gradually widens toward an outlet 36. The diameter w of the receiving port 31 is slightly larger than the diameter d of the discharging port 21. Ratio d of both diameters
/ W is appropriately selected as necessary, and for example, d / w is selected to be 0.9. The discharge port 21 and the receiving port 31 face each other, and the axes of both ports 21 and 31 are located on the axis C of the fluid coupling 10. At the rear end of the receiving pipe 30, a flange 32 is provided. The rear end surface of the receiving pipe 30 forms a contact surface 34. The contact surface 34 is smooth and
It is formed perpendicular to the axis C. The contact surface 34 is in contact with the contact surface 24 via an O-ring 35.
There is a slight gap between them, and this gap forms the suction portion G. The suction portion G communicates with the discharge port 21 and the receiving port 31 and has the same pressure as the pressure between the two ports 21 and 31, that is,
It is negative pressure. The size of the area of the contact surfaces 24 and 34 is appropriately selected as needed, but the suction force increases as the area increases. Next, the operation of this embodiment will be described. The receiving pipe 30 </ b> A at the position indicated by the alternate long and short dash line is moved to apply the flange 32 to the flange 22 of the supply pipe 20, and
4, 34 are brought into contact. At the inlet 26 of the supply tube 20, a fluid, for example,
When the fire extinguishing water S is supplied at a pressure P1, the water S
3 and is squeezed at the outlet 21 and the water pressure P
1 is converted from the velocity head to the outlet 3
1 and is converted into a pressure head again in the receiving passage 33 and discharged from the outlet 36 at a pressure P3. At this time, the water discharge pressure P2 from the discharge port 21
Is obtained by the following equation based on Bernoulli's theorem. In ^{P2 = P1-Q 2 / 2gS} 1 2 [0019] This equation, Q is the flow rate of the outlet 21,
S ₁ indicates the cross-sectional area of the discharge port 21 and g indicates the gravitational acceleration. Accordingly, the flow rate Q, discharge pressure P2 if the pressure P1 is constant is a function of the cross-sectional area S ₁ of the outlet 21, can be a negative value for water discharge pressure P2 by selecting the cross-sectional area S ₁ . As described above, the water discharge pressure P 2 has the lowest pressure in the supply passage 23 and the supply passage 33. For example, when the pressure P1 in the supply path 23 is 10 kg / cm ² and the pressure P3 in the reception path 33 is 8 kg / cm ² , the water discharge pressure P2 is −1 kg / cm ² . Since the water discharge pressure P2 is the pressure of the suction portion G between the contact surfaces 24 and 34, the two contact surfaces 24 and 34 are strongly attracted and sucked via the suction portion G. As a result, the two tubes 20, 30 are firmly connected and integrated. Even if the two pipes 20, 30 are pulled in the opposite directions during the water supply, the two pipes 20, 30 cannot be separated due to the suction force at the suction portion G. However, when the supply of water to the supply pipe 20 is stopped, the suction force at the suction section G is lost, so that the suction is automatically released and the two pieces 20 and 30 are separated. A second embodiment of the present invention will be described with reference to FIGS. 2 and 3. The same reference numerals in FIG. 1 denote the same parts in the same name and function. This embodiment is a case where the fluid coupling is used for fire extinguishing equipment in a multistory parking lot. The main differences between this embodiment and the fluid coupling of the first embodiment are as follows: (1) When the receiving pipe and the supply pipe come into contact with each other, the division valve is automatically opened or a water supply pump (not shown) is used. ) Is turned on, and when the two are separated, the switches are turned off;
(2) The guide R is provided so that the flange 32 of the receiving pipe 30 can be easily brought into contact with the flange 22 while being aligned. In FIG. 3, reference numeral 20 denotes a supply pipe provided on a wall surface 47 facing the reception pipe 30 of the fluid coupling 10, and the supply pipe 20 stores a foam extinguishing agent via a partition valve 44. Unit (not shown). Reference numeral 41 denotes a vehicle J mounted thereon, and a motor 45 and three driven guide wheels 4.
8, a foam head mounted on the car mounting part 41 and connected to the receiving pipe 30 of the fluid coupling via a pipe 43;
The vehicle entrance 50 of 0 is a fire detector provided in the vehicle mounting portion 41 and connected to a fire receiver (not shown), for example, wirelessly. F is a fixing member provided on the vehicle mounting portion 41 which slidably supports the receiving pipe 30. CR is a cylinder of a piston PS. Pressing causes the receiving pipe 30 to expand and contract. MS is a microswitch that is turned on and off by the tip am of the arm. When a fire occurs in the vehicle mounting section 41A, the fire detector 50A operates and sends a fire signal to a fire receiver (not shown). Upon receiving the fire signal, the fire receiver determines the fire occurrence position, that is, the vehicle mounted portion 41A, based on the fire signal, and sends the information to a control panel (not shown). Based on the information, the control panel controls a partition valve 44A corresponding to the vehicle mounting portion 41A.
And a connection command to the cylinder CR. When the cylinder CR extends the piston PS in the direction of the arrow A, the arm AM does not rotate downward due to the action (tensile force) of the spring SP, but is pushed in the same direction to extend the receiving pipe 30 forward. The flange 32 of the receiving pipe 30 is guided by the guide R while the flange 2 of the
2 When the piston further extends in the same direction, the spring SP extends, and the tip am of the arm AM rotates downward and presses the microswitch MS. This turns on the pump (not shown). Then, the foam extinguishing agent is opened from its storage part (not shown), the division valve 44A and the fluid coupling 1 are opened.
The air is supplied through the supply pipe 20 and the reception pipe 30 of the vehicle, and is foamed and discharged by the foam head 42 of the vehicle mounting portion 41A. After the end of the fire extinguishing operation, when the piston PS moves in the direction opposite to the direction of the arrow A according to an instruction from the control panel, the microswitch MS is turned off and the receiving pipe 30 returns to the original position. In addition, a rod is provided through the contact surface 34 of the flange 32 of the receiving pipe 30, and a microswitch MS is provided on the contact surface 32 of the flange 22 of the feeding pipe 20. A pump (not shown) may be turned on in contact with the microswitch. In the present embodiment, the supply pipe 20 is provided with a microswitch by making the receiving pipe 30 extendable. On the contrary, the supply pipe 20 is made to be extendable and the microswitch is provided by the receiving pipe 30. May be provided. A third embodiment of the present invention will be described with reference to FIGS. In this embodiment, the fluid coupling 10 is used for a fire hydrant 61 as a water supply source. The main difference between this embodiment and the first embodiment is that the supply path 23 of the supply pipe 20 is sharply narrowed, and the ratio d / D of the diameter between the inlet 26 and the discharge port 21 is the second. Smaller than one example, for example d /
D means that it is formed in half. 4 and 5, a water supply source, for example, a fire hydrant 61 and a fire hose 60 connected to the fire hydrant 61 are shown.
When the water is introduced through the supply pipe 20 of the fluid coupling 10 provided at one end of the fire hydrant 61 and the supply pipe 30 of the fluid coupling provided at one end of the fire hose 60, the pipe 30 is They are connected in a state where there is no support to be fixed to the tube 20. This is because the supply pipe 20 of the fluid coupling 10 and the receiving pipe 30 of the flow coupling 10 are in the suction state G in the water-conducting state.
By attracting each other through For this reason, when the water supply in the hose is interrupted for any reason, such as stepping on the hose, the connection between the supply pipe 20 and the receiving pipe 30 is automatically released. Therefore, it is possible to prevent the hose 60 from being damaged by water pressure, and the supply pipe 20 and the receiving pipe 30 of the fluid coupling are automatically disconnected even when the water supply is stopped when the fire extinguishing operation is completed. , And you can easily do that. A fourth embodiment of the present invention will be described with reference to FIG. 6. This embodiment is different from the fluid coupling 10 of the second embodiment in that a through hole h communicating with the suction portion G is formed in the flange 32. That is, the through hole h is connected to the foam concentrate tank BT via the hose H. In this embodiment, the inlet 26 of the supply pipe 20 is
When the fire extinguishing water S is supplied to the tank, the pressure near the discharge port 21 becomes negative, the foam concentrate B in the foam concentrate tank BT is sucked into the suction part G through the through hole h, and the fire extinguishing enters the receiving port 31 from the discharge port 21. The water is mixed with the water S to form the foam SB. In the above embodiment, the case of supplying fire extinguishing water using a fluid coupling has been described. However, the application of the fluid coupling is not limited to this.
Of course, it can be used as a pipe joint for fluids such as gas. As described above, the present invention is configured as described above. When the pressure fluid is supplied to the supply pipe after the contact surface of the supply pipe and the contact surface of the receiving pipe are brought into contact with each other, the discharge is performed. The pressure near the outlet is negative, and the suction section is negative. Therefore, the two contact surfaces attract each other, so that the supply pipe and the reception pipe are firmly connected and integrated. When the supply of the pressurized liquid to the supply pipe is stopped, the suction section becomes atmospheric pressure, so that the suction force is lost and the two pipes are separated. Thus, according to the present invention,
Moreover, the fluid coupling can be reliably attached and detached. Further, maintenance and inspection of the joint are easier than in the conventional example.

[Brief description of the drawings] FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention. FIG. 3 is an enlarged view of a main part of FIG. 2; FIG. 4 is a side view showing a third embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view taken along line VV of FIG. 4; FIG. 6 is a longitudinal sectional view showing a fourth embodiment of the present invention. [Explanation of symbols] 10 Fluid coupling 20 Supply pipe 21 Outlet 23 Supply channel 24 contact surface 26 entrance 30 receiving pipe 31 Receiving port 33 Receiving route 34 contact surface Exit 36

Claims (1)

(57) [Claims 1] A contact surface of a supply tube and a contact surface of a receiving tube are brought into contact with each other. A fluid coupling communicating with a receiving port, wherein a suction unit communicating with the discharge port and the receiving port is provided between a contact surface of the supply pipe and a contact surface of the receiving pipe; A fluid coupling, comprising: a micro switch for operating a control switch of a pump when a contact surface of the supply pipe and a contact surface of the reception pipe contact the pipe or the receiving pipe.