JPH0324376A - Proportional control valve - Google Patents

Abstract

PURPOSE:To completely close a valve with compact structure so as to simplify modification of a flow rate control range by integrating an actuator main shaft with a valve to provide a clearance between the columnar outer surface of the valve and the tubular inner surface of an orifice, and mounting an elastic seal to below the orifice, and also enabling exchange of the orifice. CONSTITUTION:When a columnar valve 7 falls down to its complete closing position an O-ring 11 in the valve main body 3 completely seals the space between the valve 7 and the main body 3 and so a flow passage from the inlet hole 3b of the main body 3 to the outlet hole 3a through a clearance 10 is blocked and no leakage occurs. When the valve 7 is pulled up by an actuator 12 the valve 7 is separated from the O-ring 11 and a fluid is allowed to pass through the clearance 10 between the columnar outer surface 7a of the valve 7 and the tubular inner surface 9a of an orifice 9 and through a notched channel 9c and flow from the inlet hole 3b to the outlet hole 3a. In this case, resistance that the fluid receives is different with the length of pullin-up of the valve 7 ie. the axial length of the clearance 10, so that the flow rate is varied. Also, because the orifice can be exchanged, the flow rate can be set in a required control range.

Description

[Detailed Description of the Invention] Gas and other gases and water. This is a proportional control valve that proportionally controls the flow rate of liquid such as oil by moving the valve body up and down using an actuator to obtain the required flow rate.It has a particularly compact structure and cannot be completely closed. This relates to a proportional control valve that can change the flow rate control range. (Prior art and its! B) Conventional proportional control valves have extremely diverse structures because the types and conditions of the fluids to be controlled are diverse, and the range of flow rates to be controlled is wide-ranging. was there. However, the common features of these products are that the actuator is attached to the valve using a bracket or connector, which means that they are large in size and require a large installation space, and that they cannot be completely closed in the fully closed position. Is it difficult?
It was necessary to create a structure that would apply a large amount of force to the valve body in order to completely close it. Furthermore, it is extremely difficult or extremely difficult to change the flow rate control range! l! It was a ceremonial task. The present invention aims to solve the problems of these conventional proportional control valves and provide a proportional control valve that is compact, can be completely closed, and can easily change the control range of flow rate. and 1. Means for Solving the Problems The present invention provides l! which the above-mentioned conventional proportional control valve has! ! In order to solve the problem, I configured it as follows. This is a proportional control valve that proportionally controls the flow rate by moving the valve body up and down using an actuator, the actuator part is directly attached to the valve part, and the main shaft of the actuator part and the valve body are integrally constructed. The valve body is cylindrical, and a required clearance is provided between the cylindrical outer surface of the valve body and the circular inner surface of a substantially cylindrical orifice installed in the valve body,
An elastic sealing member such as an O-ring is installed below the orifice in the valve body to seal between the valve body and the valve body when the valve body is lowered to the lowest fully closed position. I made it.

Also, the orifice can be replaced with one having the cylindrical inner surface of the required diameter. (Function) Since the proportional control valve of the present invention is constructed as described above, it functions as follows. First, when the cylindrical valve body is lowered to the lowest fully closed position, the O
An elastic sealing member such as a ring completely seals the gap between the valve body and the valve body, so there is no leakage. When the valve body is then pulled up by the actuator, the valve body separates from the elastic sealing member such as the O-ring, and fluid flows through the gap between the cylindrical outer surface of the valve body and the cylindrical inner surface of the orifice. In this case, the resistance that the fluid receives varies depending on the length of the valve body pulled up and the length in the axial direction of the gap between the cylindrical outer surface of the valve body and the cylindrical inner surface of the orifice, and the flow rate changes. In other words, if the length of the valve body pulled up is small, the fluid resistance is large and the flow rate is small, and if the length of the valve body pulled up is large,
The fluid resistance is small and the flow rate is large. Fluid pressure. viscosity.
Depending on whether the gas or liquid is used, the control range of the flow rate will differ if the same orifice is used, but since the orifice of the proportional control valve of the present invention can be replaced, select the orifice that brings the flow rate within the required control range and replace it. Then, the desired control range can be easily achieved.

In the proportional control valve invented by Mataki, the actuator section is attached directly to the valve section. Since the main shaft of the actuator and the valve body are integrated or configured to be integrated, there is no need to use brackets or connectors, and the external shape is compact and the installation space is small. (Example) An example of the proportional control valve of the present invention will be described based on the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the proportional control valve of the present invention. 'In figure M1, 1 is the actuator part, 2 is the valve part, N3 is the valve body, and 4 is the flange fixed to the valve body 3 with a lock nut 5 (note that the flange 4 may be molded integrally with the valve body 3). 6 is a bolt, and the actuator part 1 is connected to the flange 4 of the valve part 2 by the bolt 6.
It is attached directly to the 7 is a cylindrical valve body, and the valve body 7 is connected to the actuator section 2.
It is formed integrally with the main shaft 8 of. The valve body 7 and the main body 8 may be integrally formed by an appropriate method such as screwing them together and driving them together with a pin. Reference numeral 9 denotes a substantially cylindrical orifice, which is installed in the valve body 3, and a gap lO is provided between the cylindrical inner surface 9a of the orifice 9 and the cylindrical outer surface 7a of the valve body 7. FIG. 2 is a perspective view of the orifice 9.
As shown in FIGS. 1 and 2, the outer peripheral surface of the upper part is made into a reduced diameter surface 9b so that the clearance 10 communicates with the outflow hole 3a of the valve body 3, and the cut TI! I9c is provided. 11 is an O-ring (elastic sealing member), and the O-ring 11 is installed below the orifice 9 in the valve body 3, and the valve body 7 is lowered to the lowest fully closed position as shown in FIG. When this happens, the O-ring II seals between the valve body 7 and the valve body 3. Also, the proportional $1 control valve shown in Figure 1 has orifice 9.
can be replaced with one having the required cylindrical inner surface 9a. Next, the operation will be explained based on the embodiment shown in FIG. First, when the cylindrical valve body 7 is lowered to the lowest fully closed position as shown in FIG. 3, the flow path from the inflow hole 3b of the valve body 3 to the outflow hole 3a through the gap 10 is blocked and there is no possibility of water leakage. Next, when the valve body 7 is pulled up by the actuator 12, the valve body 7 separates from the O-ring 11, and the fluid passes through the gap 10 between the cylindrical outer surface 7a of the valve body 7 and the cylindrical inner surface 9a of the orifice 9, and flows through the cut groove 9C. and flows from the inflow hole 3b to the outflow hole 38. In this case, the resistance that the fluid receives varies depending on the length of the valve body 7 pulled up, and hence the length of the gap 10 in the axial direction, and the flow rate changes. That is, if the length of the valve body 7 pulled up is small, the fluid resistance is large and the flow rate is small, and if the pulled length is long, the fluid resistance is small and the flow rate is large. Fluid pressure and viscosity. Even if the same orifice 9 is used, the control range of the flow rate will differ depending on whether it is gas or liquid, but since the orifice can be replaced with the proportional control valve of the present invention, it is possible to select the orifice 9 that provides the desired control range for the flow rate. By replacing it, you can achieve the desired control range. Further, in the proportional control valve of the present invention, the actuator portion 1 is directly attached to the valve portion 2, and the main shaft 8 of the actuator portion 1 and the valve body 7 are configured to be integral or integral. Therefore, there is no need to use brackets or funectors, and the external shape is compact and the installation space is small. Since the proportional control valve of the present invention is constructed and operates as described above in detail, it has the following excellent effects. First, it has a compact exterior and requires only a small installation space. In addition, in the fully closed position, the fluid is completely closed and there is no leakage. Furthermore, the orifice can be replaced to achieve the desired flow rate control range. In addition, conventional actuators have a structure that uses a spring load to close the fluid when fully closed, but the sealing load must be applied to overcome the spring reaction force, which requires an actuator with a larger thrust force. On the other hand, the present invention does not require a seat spring or the like, so the thrust force of the actuator can be suppressed to the minimum necessary, so it has the advantage of being able to be miniaturized.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the proportional control valve of the present invention, and FIG. 2 is a perspective view showing the orifice of FIG. ! ...actuator part, 2...valve part, 3...
Valve body, 7... Valve body, 7a... Cylindrical outer surface, 8...
Main shaft, 9... Orifice, 9a... Cylinder inner surface, 10
...Gap, 11...0 ring (elastic sealing member)
, 12...actuator.

Claims (2)

[Claims] (1) A proportional control valve that proportionally controls the flow rate by moving the valve body up and down using an actuator, the actuator part is directly attached to the valve part, and the main shaft of the actuator part and the valve body are integrally connected. The valve body has a cylindrical shape, and a required clearance is provided between the cylindrical outer surface of the valve body and the cylindrical inner surface of a substantially cylindrical orifice installed in the valve body. An elastic seal member such as an O-ring is installed below the orifice in the valve body to seal between the valve body and the valve body when the valve body is lowered to the lowest fully closed position. A proportional control valve characterized by: (2) The proportional control valve according to claim 1, wherein the orifice is replaceable with one having the cylindrical inner surface of a desired diameter.