JPH0532881U - Flow rate switching valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a flow rate switching valve capable of easily and automatically switching the flow rate between large and small. A spherical valve seat 13 is provided in a valve box 2 having two connection ports 14 and 15, and a spherical valve body 3 is rotatably positioned in the spherical valve seat 13, and the spherical valve body 3 is provided with Connection port 1
A plurality of passages 21, 22 communicating with 4, 15 are arranged so as to intersect with the rotation direction of the spherical valve body 3 and one of the passages 21, 22.
22 is a flow rate switching valve that is provided so as to communicate with the connection ports 14 and 15 and has different passage cross-section sizes of the plurality of passages 21 and 22, and a plurality of passages 21 that communicate with the connection ports 14 and 15. , 22 is switched to obtain a flow rate corresponding to the passage cross-sectional areas of the passages 21 and 22.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flow rate switching valve that can easily and automatically switch the flow rate between large and small.

[0002]

[Prior Art]

 A general valve is designed to control the flow rate as well as turning the fluid on and off. The fluid is turned on and off by opening and closing the valve body, and the flow rate is adjusted by adjusting the opening degree of the valve body. That is, in order to obtain a specific flow rate of the fluid, it is necessary to open the valve body and adjust the opening to a specific degree. This adjustment of the opening degree will be explained using the ball valve shown in FIG. The ball valve 101 is provided with a spherical valve seat 105 in a valve box 104 in which two connection ports 102 and 103 are opened, and a spherical valve body 106 is rotatably located around the A axis in the spherical valve seat 105. The spherical valve body 106 is provided with a passage 107 communicating with the connection ports 102 and 103. When the center line of the connection ports 102 and 103 is a and the center line of the passage 107 is b, it is fully closed (OFF) when the angle between the center line a and the center line b is 90 °. When the angle between the center line b and the center line b is 0 °, it is fully open (ON), and the flow rate is adjusted by the size of the angle between the center line a and the center line b.

[0003]

[Problems to be solved by the device]

 The flow adjustment required for the valve does not necessarily have to be stepless, and depending on the type of piping system in which the valve is used, simply switching the flow rate between high and low may be sufficient. In this case, the above-mentioned ball valve is originally a valve suitable for turning on and off the fluid, and since the flow rate suddenly changes at a delicate angle of less than 90 ° when adjusting the flow rate, a cylinder device (not shown) can be used to control the predetermined amount of the spherical valve element 105. Even if the rotation angle is switched, there is a problem that the flow rate is unstable. As another valve suitable for flow rate adjustment, for example, there is a needle valve that adjusts the flow rate in the delicate gap between the valve seat of the conical hole and the valve element of the cone, but for adjusting the flow rate, a valve for raising and lowering the valve element is used. It is necessary to rotate the handle many times, and it is difficult to automate it easily. Further, a control valve for automatically detecting the pressure and driving the diaphragm to obtain a predetermined opening can be used, but the structure is complicated and the cost is high.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to switch a flow rate easily and automatically, for example, to a large or small flow rate. It is intended to provide a valve.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the flow rate switching valve according to the present invention is provided with a spherical valve seat in a valve box with two connection ports opened, and the spherical valve body is rotatably positioned in the spherical valve seat. The spherical valve body is provided with a plurality of passages communicating with the connection port so as to intersect the rotation direction of the spherical valve body and one of the passages communicates with the connection port. The size is different.

[0006]

[Action]

 A flow rate equivalent to the passage cross-sectional area of the passage can be obtained by simply switching the passages that communicate with the connection port.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a flow rate switching valve of the present invention, where (a) shows a large flow rate and (b) shows a small flow rate.

In FIG. 1A, a flow rate switching valve 1 mainly includes a valve box 2, a spherical valve element 3 located inside the valve box 2, and a cylinder device 4 for rotating the spherical valve element 3 at a predetermined angle. It is a part.

The valve box 2 has flanges 11 and 12, and a spherical valve seat 13 is formed in the center. Further, connection ports 14 and 15 penetrating the spherical valve seat 13 from the flanges 11 and 12 are opened, and packings 16 and 17 are mounted between the spherical valve seat 13 and the flanges 11 and 12. The spherical valve element 3 is rotatably located in the spherical valve seat 13 about the A axis. In this spherical valve element 3, a first passage 21 having an inner diameter D2 equal to the inner diameter D1 of the connection ports 14 and 15 intersects the first passage 21 at an angle of 90 ° in the rotational direction, and is smaller than the inner diameter D2. A second passage 22 having an inner diameter D3 is provided. In the illustrated state, the first passage 21 communicates with the connection ports 14 and 15, and the second passage 22 is blocked by the valve box 2. A valve rod (not shown) is erected on the A-axis of the spherical valve body 3, and a lever 23 is attached to the valve rod. The tip of the rod 24 of the cylinder device 4 is connected to the lever 23, and the spherical valve element 3 can take the position shown in the figure or the position rotated by 90 ° by the expansion and contraction of the rod 24 of the cylinder device 4.

Next, the operation of the above-described flow rate switching valve 1 will be described below. In FIG. 1A, when the rod 24 of the cylinder device 4 is shortened and the lever 23 is in the solid line position, the first passage 21 of the spherical valve body 3 and the connection ports 14 and 15 communicate with each other. Since the inner diameter D1 of the connection ports 14 and 15 and the inner diameter D2 of the first passage 21 are the same, there is no restriction by the flow rate switching valve 1 and the flow rate becomes a large flow rate determined by the line resistance. In FIG. 1B, when the rod 24 of the cylinder device 4 extends and the spherical valve body 3 rotates 90 ° via the lever 23, the second passage 22 of the spherical valve body 3 and the connection ports 14 and 15 communicate with each other. .. Since the inner diameter D3 of the second passage 22 is smaller than the inner diameter D1 of the connection ports 14 and 15, the flow rate is small due to the throttling effect determined by the cross-sectional area of the second passage 22. When it is desired to change the throttle of the second passage 22, as shown in FIG. 2, the orifice 25 can be screwed into the second passage 22 from the first passage 21 side. Then, by disassembling the flow rate switching valve 1 and replacing the orifice 25, a desired arbitrary flow rate can be obtained.

FIG. 3 is a sectional view of another flow rate switching valve of the present invention. The difference from FIG. 1 is that the number of passages of the spherical valve body 3 and the cylinder device 4 can be stopped at three positions. The spherical valve body 3 has a first passage 31 having an inner diameter D2 equal to the inner diameter D1 of the connection ports 14 and 15, and a second passage 32 and a third passage 33 at positions intersecting at 60 ° on both sides in the rotation direction of the first passage 31. And are provided. The inner diameter of the second passage 32 is D3 smaller than the inner diameter D1 of the connection ports 14 and 15, and the inner diameter of the third passage 33 is D4 smaller than the second passage 32. The cylinder device 4 has a series structure of a first stage cylinder 34 and a second stage cylinder 35. When the solenoid valve 37 is left as it is and the solenoid valve 36 is energized, the piston diameter of the first-stage cylinder 34 is large, so that the stroke of the first-stage cylinder 34 is extended and the lever 23 is moved from the position a. It is the middle b position. Regardless of the state of the solenoid valve 36, when the solenoid valve 37 is energized, the second-stage cylinder 35 extends by the amount of the stroke, and the lever 23 moves from the intermediate b position to the c position. Thus, the flow rate can be switched to a large flow rate, a small flow rate, or a minute flow rate by changing the three positions of the cylinder device 4. In addition, if the third passage 33 corresponding to a minute flow rate is left blind, the fluid can be turned on and off.

Next, an example of a piping system to which the flow rate switching valve of the present invention is applied will be described with reference to FIG. This is a system for injecting a predetermined amount of liquid A and liquid B into a mold device 41 from a first casting tank 42 and a second casting tank 43. The flow rate switching valves 46 and 47 of the present invention are attached to each of a pipe line 44 from the first casting tank 42 to the mold device 41 and a pipe line 45 from the second casting tank 43 to the mold device 41. .. The flow rate switching valves 46 and 47 correspond to those shown in FIG. 3, and the third passage 33 is made blind so that it can be turned on and off. When the flow rate switching valves 46, 47 are switched to a large flow rate (the first passage 31 in FIG. 3) all at once, the liquids A and B are injected from the first casting tank 42 and the second casting tank 43 at high speed. It Then, when the flow rate switching valves 46 and 47 are simultaneously switched to the small flow rate (the second passage 32 in FIG. 3) at a certain timing, the A liquid and the B liquid are injected at a low speed to reach a predetermined amount. In this way, when the flow rate is switched between high and low, the accuracy of injection into the mold device 41 is improved. Further, the discharge amount from the flow rate switching valves 46, 47 is determined by the cross-sectional area of the passage, and the discharge balance of the A liquid and the B liquid becomes constant.

[0013]

[Effect of the device]

 The flow rate switching valve in the present invention is such that a flow rate corresponding to the passage cross-sectional area of the passage can be obtained by simply switching a plurality of passages communicating with the connection port, and the spherical valve element is rotated by, for example, a cylinder device. With such a simple operation, the flow rate can be reliably switched between large and small, and automatic switching of a predetermined flow rate can be easily achieved. Further, the basic valve form is the same as that of a ball valve, and it is a very simple structure in which only a cylinder device is added to this, and an inexpensive flow rate switching valve can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a flow rate switching valve of the present invention.

FIG. 2 is a diagram showing another embodiment of the passage.

FIG. 3 is a sectional view of another flow rate switching valve of the present invention.

FIG. 4 is a diagram showing an example of a piping system to which the flow rate switching valve of the present invention is applied.

FIG. 5 is a sectional view of a conventional ball valve.

[Explanation of symbols]

 1 Flow switching valve 2 Valve box 3 Spherical valve body 13 Spherical valve seat 14, 15 Connection port 21 First passage 22 Second passage

Claims (1)

[Scope of utility model registration request] 1. A spherical valve seat is provided in a valve box having two connection ports open, a spherical valve body is rotatably positioned in the spherical valve seat, and the spherical valve body has a passage communicating with the connection port. A plurality of are provided so as to intersect with the rotation direction of the spherical valve body and one of the passages communicates with the connection port, and the sizes of the passage sections of the plurality of passages are made different. Switching valve.