JPH0132386B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a pipe connection device suitable for connecting pipes used, for example, as refrigerant fluid passages in cryogenic equipment.

Conventionally, piping connections are generally made with both ends open, but if the piping is connected in the above condition in a refrigeration circuit such as a cryogenic equipment, air and other contaminants may flow into the piping. However, there are problems such as the refrigerant fluid freezing in the refrigeration circuit. Further, the method of connecting the pipes by applying pressure from both sides of the pipes and blowing off the refrigerant fluid is accompanied by uncertainty, requires considerable skill, and is extremely troublesome.

In addition, as a device for connecting pipes with both ends closed, Japanese Patent Publication No. 15480, Japanese Patent Publication No. 40123, Sho 48, Publication No. 21770 of Utility Model No. 53, and Publication of Utility Model Publication No. 53 of Showa 53-
Publication No. 47405 discloses that a lift valve is provided at the opening of the connection part of the pipes so as to close the opening by the pressure of a spring, and by energizing the lift valve against the pressure of the spring at the time of connection, each pipe is made to communicate with each other. something is proposed. However, this configuration has the drawback that the lift valve is always present in the flow path within the pipe, and the conductance at the connection portion becomes small.

On the other hand, US Pat. No. 2,872,216 proposes a system in which ball valves are provided at the openings of the connecting portions of the pipes, and after the pipes are connected in a closed state, the two ball valves are rotated to connect the pipes. With this configuration, piping can be connected with both ends closed,
Furthermore, it is possible to prevent a decrease in conductance at the connection portion. However, two ball valves are required, which complicates the structure, and the two ball valves must be rotated, making operation difficult.

The present invention was made in consideration of the above circumstances, and
The purpose is to provide a piping connection device that can connect and disconnect piping connections with both ends closed, prevent conductance from decreasing at the connections, and simplify valve opening and closing operations. There is a particular thing.

That is, the present invention provides stop valves that are connected to each other to form a set of rotary valves when the respective pipes are connected, at each connection opening of two pipes to be connected, and also provides a stop valve that is connected to each other to form a set of rotating valves when the respective pipes are connected. The above objective is achieved by providing a rotating mechanism that rotates the rotating valve and connects each pipe.

Hereinafter, details of the present invention will be explained with reference to illustrated embodiments.

FIG. 1 is a sectional view showing a schematic structure of an embodiment of the present invention. In the figure, 1 and 2 are first and second pipes through which low-temperature fluid flows, one end of the first pipe 1 is inserted into a low-temperature container 3, etc., and one end of the second pipe 2 is connected to a refrigerator (not shown). etc. are inserted. Further, at each other end of the pipes 1 and 2, first and second pipes are provided.
Connecting mechanisms 4 and 5 are provided, respectively, and the pipes 1 and 2 are connected via these connecting mechanisms 4 and 5.

The first pipe 1 is composed of an inner pipe 11 made of stainless steel or the like and an outer pipe 12 surrounding the inner pipe 11, and a vacuum insulation layer is formed between the inner pipe 11 and the outer pipe 12. ing. Further, the first connection mechanism 4 includes a cylindrical body 41, a first stop valve 42,
It is composed of a valve stem 43, a bolt 44, an O-ring 45, a retaining ring 46, and the like. That is, one end of a cylindrical body 41 is attached to the other end opening of the first pipe 1, and a first stop valve 42 is housed inside this cylindrical body 41. The stop valve 42 is formed by dividing a spherical ball valve into two parts, and is rotatably supported by a valve stem 43 and bolts 44 attached to the top and bottom walls of the cylindrical body 41. There is. The outer peripheral surface of the stop valve 42 is brought into contact with the wall surface of one end of the cylindrical body 41, so that the opening of the piping 1 is hermetically blocked. Further, the valve stem 43 is inserted into the cylinder 41 through a through hole formed in the upper wall of the cylinder 41, and is rotatably attached to the through hole with a retaining ring 46. The gap between the valve stem 42 and the through hole is hermetically sealed with an O-ring 45. Also,
The bolt 44 is fastened to a through hole bored in the bottom wall of the cylindrical body 41.

On the other hand, the second connection mechanism 5 includes a cylindrical body 51, a second
It consists of a stop valve 52, a guide pin 53, cap nuts 54, 55, an O-ring 56, etc. That is, the outer diameter of the cylindrical body 51 is slightly smaller than the inner diameter of the cylindrical body 41, and the inner diameter is the second diameter.
The second stop valve 52 is provided at the opening at one end of the pipe 2. The stop valve 52 forms a ball valve together with the first stop valve 42, and is supported by a guide pin 53 fitted into a through hole bored in the wall of the cylindrical body 51.
That is, as shown in FIG.
An arc-shaped groove 52a is bored on the outer peripheral surface of the groove 5.
A guide pin 53 is connected to 2a so that the stop valve 52 is rotatably supported. Further, the second pipe 2 is inserted into the cylinder 51 from the other end of the cylinder 51. The gap between the pipe 2 and the cylindrical body 51 is hermetically sealed with an O-ring 56 by tightening the cap nut 54. And the cylinder body 5
1 is inserted into the cylindrical body 41 and connected to the cylindrical body 41 by tightening a cap nut 55.

Note that 61 in FIG. 1 is a sealing member that airtightly seals the space between the cylindrical bodies 41 and 51. Further, reference numeral 62 in the figure represents a valve seat made of fluororesin or the like, which airtightly seals between the cylindrical bodies 41, 51 and the stop valves 42, 52, respectively.

The operation of this device configured in this way will be explained. Now, assuming that the first and second pipes 1 and 2 are in a disconnected state, the first and second stop valves 42 and 52 are in a state in which the cylinder bodies 41 and 51 are respectively closed, as shown in FIG. is maintained. Therefore, each opening of the pipes 1 and 2 is both in a closed state.

Next, when connecting the first and second pipes 1 and 2, the cylindrical body 51 is first inserted into the cylindrical body 41 and the cap nut 55 is fastened to the threaded portion 41a of the cylindrical body 41. This connects the first and second stop valves 42, 52 to form a ball valve as shown in FIG. And the valve stem 43
When the ball valves 42 and 52 are rotated by 90 degrees, the ball valves 42 and 52 rotate together, and the through holes of the ball valves are connected to the respective pipes 1, 52 as shown in FIG.
Connects with 2. In other words, the pipes 1 and 2 are in communication with each other. Note that in this state, the second pipe 2 is connected to the first pipe 2.
The pipe 1 is inserted into the pipe 1 and used for transferring a low-temperature fluid such as liquid helium. In addition, when separating the first and second pipes 1 and 2, perform the operation opposite to that described above, that is, rotate the valve stem 43 in the opposite direction, then loosen the cap nut 55 and remove the pipe from the cylinder body 41. body 51
By pulling out the pipes 1 and 2, the openings of the pipes 1 and 2 are separated in a closed state. In this way, the pipes 1 and 2 can be attached and detached with both ends closed.

In this way, in this device, stop valves 42 and 52 are provided at each connection opening of the two pipes 1 and 2 to be connected, respectively, and are connected to each other to form a ball valve when the pipes 1 and 2 are connected. , 2, then connect the stop valves 42, 52.
The pipes 1 and 2 are made to communicate with each other by rotating together. Therefore, the pipes 1 and 2 can be connected with both ends closed, and it is possible to prevent air, impurities, and the like from entering the pipes 1 and 2 during connection. Therefore, when transferring a refrigerant fluid such as liquid helium, it is possible to prevent the refrigerant fluid from freezing inside the pipes 1 and 2.
Furthermore, the above connection can be reliably and easily made by simply tightening the cap nut 55 and rotating the valve stem 43.

Furthermore, since a ball valve is used as the valve body and the hole diameter of the ball valve is approximately the same as the inner diameter of the pipe, conductance at the connecting portion does not decrease. Further, unlike the case in which a ball valve is provided at each opening of a connecting portion of a pipe, the opening can be opened and closed by rotating one ball valve, so there is an advantage that operation can be facilitated.

Note that this invention is not limited to the embodiments described above. For example, the shape of the rotary valve formed by connecting the two stop valves is not limited to a sphere, but may be cylindrical or flat spherical. Furthermore, any shape may be used as long as the openings of the respective pipes can be closed in the divided state and form a rotary valve in the connected state. Moreover, the rotation mechanisms of the valve stem, bolt, guide pin, etc. can be changed as appropriate according to specifications. Furthermore, it goes without saying that the present invention can be applied not only to refrigerant fluids such as liquid helium, but also to piping that transports various liquids that do not want to be contaminated with air or other impurities. In addition, various modifications can be made without departing from the gist of the invention.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a schematic structure of an embodiment of the present invention, Fig. 2 is a plan view showing the main structure of the above embodiment, and Figs. 3 and 4 respectively show the operation of the above embodiment. FIG. 3 is a sectional view showing the valve in the closed state, and FIG. 4 is a sectional view showing the valve in the open state. 1, 2... Piping, 4, 5... Connection mechanism, 41,
51... cylinder body, 42, 52... stop valve,
43... Valve stem, 53... Guide pin.

Claims (1)

[Scope of Claims] 1. Two pipes to be connected, and a set of rotary valves that are provided at the openings of the respective connection parts of these pipes so as to close the openings, and that are connected to each other when the respective pipes are connected. 1. A piping connection device comprising: a stop valve that forms a stop valve; and a rotation mechanism that rotates the rotation valve to connect the piping when the piping is connected. 2 The stop valve is configured such that the rotary valve is
The piping connection device according to claim 1, characterized in that it is formed by dividing it. 3. The pipe connection device according to claim 1, wherein each of the pipes is connected to each other, and one of the pipes is inserted into the other through the rotary valve.