JPS61192992A - Piping joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a piping joint having a control surface for liquid flow.

(Prior Art) Conventionally, the one shown in FIG. 2 is known as this type of piping joint. That is, 10a and 10b are pipes through which water flows;
Reference numeral 20 denotes a pipe joint that connects the pipes 10a and 10b, which includes a cylindrical connecting tube 21, a cylindrical connecting fitting 22 connected to the inflow side of the connecting tube 21, and a through hole connected to the outflow side of the connecting tube 21. 23a. Also,
Inside the connecting tube 21 is a rod-shaped element 24 that accommodates a brazing material 24a that expands and contracts depending on the water temperature, a support fitting 25 that bulges toward the outflow side and abuts the tip of the element 24, and one end of the support fitting 25. A spring 26 comes into contact with the spring 26, a valve 27 is provided with a through hole 27a that communicates the inflow side and the outflow side, and is formed sharply toward the tip on the outflow side;
A valve seat 28 having an N through hole 28a into which the tip of the valve 7 is inserted is arranged sequentially from the inflow side to the outflow side.

According to this piping joint 20, the brazing material 24a expands and contracts due to the temperature of the water flowing in the connecting tube 21, and the support fitting 25 moves. With this movement, the spring 26 expands and contracts, moving the valve 27, and the tip of the valve 27 controls the gap between the through hole 28a of the valve seat 28. As a result, the water flowing from the inflow side pipe 10a is controlled, and as shown by the arrow, the water flows through the connecting fitting 22, the connecting tube 21, and the discharge fitting 2.
3 is sequentially distributed and is discharged to the outflow side piping 10b. - (Problems to be solved by the invention) As mentioned above, the conventional piping joints not only require a large number of parts for flow control, but also have a very complicated structure and high manufacturing costs. In addition, the large number of parts causes the piping joint to become larger, which in turn leads to the problem of increasing the size of the equipment that uses the piping joint.

(Object of the Invention) In view of the above-mentioned conventional problems, the present invention aims to provide a piping joint that has a simple structure, is small in size, and is inexpensive to manufacture.

(Means for Solving the Problems) In order to achieve the above object, the present invention discharges the liquid when the temperature of the liquid in contact is high to reduce the volume thereof, and
A flow control member 32 is attached to the inner peripheral surface of the joint body 30 through which the liquid flows, which has the property of absorbing the liquid and increasing its volume when the liquid 1ff is low.

(Function) According to the present invention, since only the flow rate control material is attached to the inner circumferential surface of the joint body, it is possible to form a piping joint with a simple structure and a small size.

(Example) Figures 1(a) and (b) show an example of the present invention.
Components that are the same as those of the conventional example are represented by the same reference numerals. That is,
10a is a pipe on the inflow side, and 10b is a pipe on the outflow side.

Reference numeral 30 denotes a cylindrical pipe joint body, whose outer circumferential surfaces on both sides are screwed onto the inner circumferential surfaces of the ends of the pipes 10a and 10b, respectively, to connect the pipes 10a and 10b. In addition, the joint body 3o
An annular groove 31 having a predetermined width is provided on the central inner peripheral surface of the
A ring-shaped flow rate control member 32 is attached to the groove 31 .

The flow rate control material 32 is a gelatinized crosslinkable polymer based on an acrylamide derivative, and changes its volume depending on the temperature of the liquid it comes into contact with. That is, when wet, it releases liquid, such as water, to reduce its volume, and when it is at a low temperature, it absorbs water and increases its volume.

Mitsui Toatsu Chemical Co., Ltd.'s water absorbing and desorbing polymer rM-100J is known as a water absorbing and depleting polymer that bends.
According to M-100J, when the water temperature changes from 10°C to 55°C, 80% of water enters and exits the gel, resulting in a volume change.

As described above, the present invention uses a flow rate control material 32 on the inner circumferential surface of the joint body 30, which has the property of releasing water and reducing the volume when the temperature is high, and absorbing water and increasing the volume when the temperature is low. Since it is provided in the groove 31, when the temperature of the water flowing in the joint body 30 is high, the flow rate control material 32 releases water and its volume decreases, as shown in FIG. The inner diameter of the main body 3° becomes larger, and a large amount of water flows from the pipe 10a to the pipe 1°b. Conversely, when the temperature is low, the flow rate control material 32 absorbs water and its volume increases, as shown in FIG.
Since the inner diameter of the portion 1 is made smaller, the amount of water flowing through the pipe 10b is smaller than the amount of water flowing through the pipe 10a. Therefore, for example, when used as a piping joint for a filtered water distribution pipe used for floor heating in a heating system (not shown), when high temperature water is flowing, a large amount of water is circulated to perform floor heating, and when low temperature water is flowing, it is In this case, the circulation of the flowing water is reduced to prevent the bed temperature from becoming low.

(Effects of the Invention) As explained above, the piping joint according to the present invention discharges the liquid to reduce the volume when the temperature of the liquid in contact is high, and also discharges the liquid when the temperature of the liquid is low. Since a flow rate control material that has the property of absorbing and increasing volume is attached to the inner peripheral surface of the joint body through which the liquid flows, the flow rate of the liquid is controlled according to the temperature of the liquid flowing through the piping joint. Of course, since only the flow ffl #1lill material is attached to the inner peripheral surface of the joint body, it is possible to form a piping joint with a simple structure and small size, and furthermore, it is possible to reduce the cost. This has the advantage of being able to provide inexpensive piping joints.

[Brief explanation of drawings]

The drawings are provided to explain the present invention, and include FIGS. 1(a) and (b).
) shows the piping joint according to the present invention, and FIG.
) is a cross-sectional view showing the state when the water temperature is high, and Figure 1 (
b) is a sectional view showing a state when the water temperature is low, and FIG. 2 is a sectional view showing a conventional piping joint. In the figure, 30...piping joint body, 32...flow control material.

Claims (1)

[Claims] When the temperature of the liquid in contact is high, the liquid is released and the volume is reduced, and when the temperature of the liquid is low, the flow rate control material has the property of absorbing the liquid and increasing the volume. A piping joint characterized by being attached to the inner peripheral surface of the joint body.