JPS61149674A - Check valve - Google Patents

Abstract

PURPOSE:To prevent breakage due to an increase in flow by forming tapered pressure receive surfaces between cruciform projections of the outer peripheral surface of the cruciform portion formed by notching cross-shapedly. CONSTITUTION:A check valve is formed by elastic material, and is provided with an inflow port 3 for a fluid disposed at one end of passage 2 provided at the central portion thereof in the axial direction. At the other end of the passage 2, an outflow port 6 for preventing a back flow is reduced in diameter to be tapered and notched cross-shapedly in such a manner as to open when fluid pressure is applied from the inflow port 3. Tapered pressure receive surfaces 10 intersecting at right angles are formed between cruciform projections 8 of the outer peripheral surface of the cruciform portion 7. When a fluid flow ing in through the inflow port flows out, an open area almost equal to the area of a fluid inflow port can be ensured so that even if the flow of a fluid is increased, the valve is not damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a check valve that controls the direction of fluid flow, and is particularly advantageous when inserted into a pipe.

Conventional technology Conventional technology, 1983. -165370, it is made of a soft elastic material, has a fluid inlet at one end of the flow passage provided in the central axial direction, and has a tapered outlet for backflow prevention at the other end of the flow passage. There are check valves that have a minus-shaped cut in the diameter, but since the outlet of this check valve has a minus-shaped cut, when the fluid that has flowed in from the inlet flows out, the outlet is shaped like an ellipse. This is done through an opening in the form of a shape, which is extremely small compared to the area of the inlet, and the pressure difference between the inflow pressure from the inlet and the outflow pressure from the outlet is large, resulting in a large pressure loss. The tendency is that the higher the flow rate of the fluid, the more difficult it is to handle the problem.(The more the flow rate of the fluid increases, the more likely it will be difficult to withstand the increase in flow rate from the inlet, resulting in many accidents resulting in damage.)

Problems to be Solved by the Invention The present invention aims to eliminate the above-mentioned drawbacks by reducing the pressure difference between the fluid pressure flowing in from the fluid inlet and the fluid pressure flowing out from the fluid outlet. In this way, the present invention aims to provide a check valve that minimizes pressure loss and is less likely to be damaged even when the flow rate of fluid flowing in from the inlet increases. It is something.

Means for Solving the Problems In order to solve the above-mentioned problem, the present invention is made of a soft elastic material, and a fluid inlet is provided at one end of the flow passage provided in the axial direction of the central part. 9! ! , an outflow port for backflow prevention is tapered in diameter and cut into a cross shape at the end.
A tapered pressure receiving surface is formed between the cross-shaped protrusions on the outer peripheral surface of the cross-shaped portion.

As described above, the present invention is made of a soft elastic material, has a fluid inlet at one end of the flow passage provided in the axial direction of the central part, and has a tapered outlet at the other end of the flow passage for preventing backflow. The diameter is reduced to form a cross-shaped cut, and a tapered pressure receiving surface is formed between the cross-shaped protrusions on the outer peripheral surface of the cross-shaped part, so that when the fluid that flows in from the inlet flows out, This is done by opening the outflow port, which is cut into a cross shape, into a substantially circular shape, making it possible to secure an opening area that is almost the same as the area of the fluid inflow port, and the inflow pressure and flow from the fluid inflow port are The pressure difference with the outflow pressure from the outlet is small, minimizing the occurrence of pressure loss, and even if the fluid tILflll increases, damage is less likely to occur. Furthermore, when the fluid flows backward from the direction of the outlet, by receiving this backflow pressure on the tapered pressure receiving surface, a pressing force is applied to the outlet in the closing direction, thereby making it possible to prevent backflow.

EXAMPLE Below, one example of the present invention will be explained with reference to the drawings. (1)
is a cylindrical body made of a soft elastic material such as silicone rubber, 70% silicone rubber, or acrylonitrile butanoene rubber, and has a fluid inlet (3) at one end of a flow path (2) provided in the axial direction of the central part. ), and from the outer periphery of this inlet (3), a 7-run no. 5
) protrudes from the outer periphery. In addition, at the other end of the flow path (2), an outlet (6) for preventing backflow is tapered to reduce the diameter.
A cross-shaped incision is formed so as to open when fluid pressure is applied from the inlet (3) direction, and tapers intersect at right angles between the cross-shaped protrusions (8) on the outer peripheral surface of this cross-shaped part (7). A shaped pressure receiving surface (10) is formed.

In order to install and use the check valve formed in this way in the intended part, it is only necessary to position the inlet (3) in the direction of fluid inflow and the outlet (6) in the direction of fluid outflow. Pipe body (1
1) If you design an example of installation in Figure ff12, you can connect the outlet (1) from the opening (13) of the one-way restrictor pipe (12).
6), and engage the annular lip (5) with the annular recess (14) provided on the inner periphery of the one-way throttle tube (12), and engage the 7 rank (4) with the open end surface (15). By this,
Fixing the position Next, fit the other connecting pipe (1G) to the outer periphery of the one-way constriction pipe (12) and fix the fitting part (17), then the check valve will be connected to the one connecting pipe (12) and the other. It is irremovably fixed by the connecting tube (16).

In the structure formed as described above, the other connection 'ff(
When the fluid that has flowed in from the inlet (3) via the inlet (113) flows out from the outlet (6), the cross-shaped outlet (6) is opened in a substantially circular shape. It is possible to secure an opening area of the outlet (6) that is almost the same as that of the inlet (3), and the inflow pressure of the fluid from the inlet (3) and the outflow pressure of the fluid from the outlet (6) are equal to each other. Since the pressure difference is small, the occurrence of pressure loss can be minimized, and since the pressure difference is small, damage is less likely to occur even if the fluid flow rate is large.

The inflow pressure of the fluid from this inlet (3) and the outlet (6)
The pressure difference between the outflow pressure of the fluid from the inventive product and the check valve with the cross-shaped outflow port (6) and the conventionally known check valve with the minus-shaped outflow port are If compared, the result will be as shown in the flow rate characteristic graph in FIG. In FIG. 3, the circle mark is a check valve provided with a cross-shaped outlet (6) of the present invention, and the triangle mark is a check valve provided with a conventionally known minus-shaped outlet. The flow rate on the vertical axis uses a logarithmic scale. In addition, both of the above second check valves have an inner diameter of 3
, 41011. They are made of the same material and have the same dimensions except for the difference between a cross-shaped outlet and a minus-shaped outlet, and air is used as the fluid. As is clear from FIG. 3, the difference in the differential pressure between the two check valves is large. For example, at flow rate 1, the product implementing the present invention has a differential pressure of approximately 100 mmAg. On the other hand, the conventionally known product has approximately 400 mmAg, which is four times as large.

In addition, when fluid flows backward from the direction of the outlet (6), this backflow pressure is received by the tapered pressure receiving surface (10), so that a pressing force is applied to the outlet (6) in the closing direction, and the backflow can be prevented.

Effects of the Invention As described above, the present invention is made of a soft elastic material, has a fluid inlet at one end of the flow passage provided in the axial direction of the central part, and has an outlet for backflow prevention at the other end of the flow passage. It is formed by tapering the diameter and forming a cross-shaped cut, and forming a tapered pressure receiving surface between the cross-shaped protrusions on the outer peripheral surface of the cross-shaped part, so that the fluid that flows in from the inlet flows out. When this is done, the outflow port is cut into a cross shape and opened into a substantially circular shape. This makes it possible to secure an opening area that is almost the same as the area of the fluid inflow port, which reduces the inflow pressure from the fluid inflow port. It is possible to obtain a check valve that has a small pressure difference between the flow rate and the outflow pressure from the outflow port, minimizes the occurrence of pressure loss, and is less likely to be damaged even when the flow rate of fluid increases.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a perspective view, Fig. 2 is a cross-sectional view of the state installed in a pipe body, and Fig. MS3 shows a product implementing the present invention and a conventionally known product with a minus type outlet. This is a flow rate characteristic graph.

Claims (1)

[Claims] It is made of soft elastic material, has a fluid inlet at one end of the flow passage provided in the axial direction of the central part, and has an outlet for preventing backflow at the other end of the flow passage, which is tapered in diameter to form a cross shape. A check valve characterized in that a notch is formed and a tapered pressure receiving surface is formed between the cross-shaped protrusions on the outer peripheral surface of the cross-shaped part.