KR20090007949A - 3-way control valve for high temperature fluid - Google Patents

Abstract

A 3-way control valve for high temperature fluid is provided to maintain surface pressure inside a valve body constant in case the volume of a conversion port is expanded due to thermal expansion and prevent fluid from being escaped to the outside by maintaining sealing properly in case of high temperature environment. A 3-way control valve for high temperature fluid comprises a valve body(100), and a converting port(200). The valve body has an inlet for fluid flow and a plurality of outlets(130). The conversion port is mounted to the center of a valve body in order to convert the stream of fluid running on the valve body. The conversion port has a channel(230) opened to the 3 way connected to the inlet and the outlets. The conversion port is installed to move inside the valve body depending on the volume variation due to thermal expansion.

Description

3-way control valve for high temperature fluid {3-WAY CONTROL VALVE FOR HIGH TEMPERATURE FLUID}

The present invention relates to a three-way valve that is installed on the flow path of the fluid set in three directions to change the flow path of the fluid as needed, in detail, the high temperature applied to the hot fluid (gas or liquid) flow path A three way control valve for fluids.

Three-way valves (or 3-way valves) are widely adopted to change the flow path of the fluid on pipes set in three directions. These three-way valves can be classified into manual and automatic depending on the operating medium.

The manual type allows the user to directly change the flow path of the fluid by applying external force to the valve port, and the automatic type converts the flow path of the fluid by rotating the conversion port by moving a step motor or a solenoid located at a low temperature part according to a control command. It is a structure that can be made. In the case of the automatic type, the driving mechanism is substantially the same as the manual type except for a configuration in which a driving medium such as a step motor or a solenoid is further added for port switching.

1A to 1B are flat cross-sectional views showing the structure and operating state of a general three-way valve.

Referring to this, the three-way valve 10 is a valve body 16 having a single inlet 12 and two outlets 14 through which fluid is introduced, and a switching port installed inside the valve body 16 ( 18). The switching port 18 controls the fluid flow path between the inlet 12 and the outlet 14 while rotating within an angular range defined by an adjustment member (not shown), for example, an operating lever or solenoid.

Specifically, the valve body 16 is usually made of a hexahedron or a cylindrical shape therein is provided with a predetermined space portion 20 for installing the conversion port 18. The inlet 12 through which fluid flows is formed at one side of the space 20, and the outlet 14 is perpendicular to the inlet 12, and has a structure in communication with the space 20.

The changeover port 18 is generally spherical or cylindrical so as to be free to rotate in a state located inside the valve body 16. This switching port 18 has a flow path 22 which is in communication at substantially right angles, which communicates the inlet 12 and one of the two outlets 14.

On the other hand, although not shown in the drawings, the adjustment member has an adjustment knob and a fixed length that is coupled to the adjustment knob and extends into the space portion 20 of the valve body 16 and engages the switching port 18. Contains the liver. The control section may be rotated in the horizontal direction in the 90 ° range.

In the conventional three-way valve described above, the fluid flows along the direction of the arrow in the initial state as shown in FIG. 1A in which the flow path 22 formed in the switching port 18 opens the inlet 12 and one side outlet. In the state as shown in FIG. 1B in which the switching port 18 is rotated 90 ° in a predetermined direction, one discharge port that has been in communication with the inlet 12 is closed, and the opposite outlet and the inlet 12 communicate with each other so that the fluid flows along the opposite outlet. do.

According to the above-described prior art, the structure of the switching port for controlling the flow path of the fluid is more directly affected by the heat energy when the energy contained in the fluid, for example, a high-temperature fluid as the working fluid than the valve body. Therefore, when the conventional three-way valve is applied on the flow path of the hot fluid, more heat is transferred to the switching port for controlling the flow path of the fluid than the valve body, and more thermal expansion may occur.

As such, when the thermal expansion of the switching port is larger, the surface pressure due to the valve body applied to the outer surface of the switching port in the limited space of the valve body is inevitably increased, resulting in an inoperability of the switching port or the thermal expansion rate of the switching port. When the endurance limit of the valve body is exceeded, it may cause deformation or breakage of the valve body. That is, the conventional three-way valve has a disadvantage that is not suitable for the high temperature environment in which the high temperature fluid is moved.

In addition, in the case of the conventional three-way valve, a sealing member made of rubber is generally interposed between the switching port and the valve body in order to prevent fluid leakage. However, such a general sealing member made of rubber is very sensitive to temperature change, especially in the above-mentioned high temperature environment (up to 750 ° C.), the volume change is severe and the proper sealing function is lost, and thus the fluid leaks to the outside. have.

The present invention is to solve the above problems, even if the switching port is increased in volume due to thermal expansion can maintain a constant surface pressure in the valve body, the proper sealing function is maintained even in a high temperature environment high temperature without external leakage of fluid Its purpose is to provide a three-way control valve for fluids.

In order to achieve the above object, the present invention provides a three-way valve, comprising: a valve body having an inlet and a plurality of outlets for fluid movement; And a switching port having a three-way open flow path installed in the center of the valve body for switching the fluid flow flowing through the valve body and communicating with the inlet and the plurality of outlets, wherein the switching port has a cross section due to thermal expansion. It provides a three-way control valve for high-temperature fluid, characterized in that the device is installed to be movable in the valve body by expansion.

According to an aspect of the present invention, a space portion in the center of the valve body in which the changeover port is to be installed and a changeover port provided in the space portion have a cross section extending toward the lower portion of the valve body. In this case, when the switching port is thermally expanded due to the influence of the high temperature fluid, the switching port may be moved downward in the space due to the mutually inclined contact by the cross-sectional expansion.

According to another aspect of the present invention, the space portion in the center of the valve body in which the switching port is to be installed and the switching port provided in the space portion have a cross section which is enlarged toward the top of the valve body. In this case, when the switching port is thermally expanded due to the influence of the high temperature fluid, the switching port may be moved upward in the space due to mutual inclined contact by the cross-sectional expansion.

Preferably, a sealing member for sealing with the valve body is provided on the upper and lower portions of the port. The sealing member is held in the valve body by a flange fastened to the valve body.

The sealing member may be preferably made of a graphite material. As such, when the sealing member of graphite material is applied, a sealing performance suitable for the high temperature environment can be maintained.

According to the present invention, when the volume of the changeover port increases due to thermal expansion, the changeover port moves downwardly or upwardly in the space of the valve body by the volume increase amount to secure a more space, and thus the changeover port in the valve body. The surface pressure acting on the outer surface can be kept constant at all times. As a result, it is possible to prevent the deformation or breakage of the valve body caused by the inability to rotate the switching port caused by the increase in the surface pressure due to thermal expansion, and also when the thermal expansion rate of the switching port exceeds the endurance limit of the valve body. Have

In addition, according to the application of the sealing member of the graphite material, there is an advantage that the appropriate sealing function is maintained even in a high temperature environment there is no external leakage of the fluid. That is, it has an advantage that is very suitable for high temperature environment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is an exploded perspective view showing the overall configuration of the three-way control valve for high temperature fluid according to the first embodiment of the present invention, Figure 3 is a combined cross-sectional view of the three-way control valve shown in FIG.

2 to 3, the three-way control valve includes a valve body 100 and a switching port 200 installed in the valve body 100 to switch a flow path of the fluid. The switching port 200 has a control shaft 210 integrally extended to the outside of the valve body 100, the control shaft 210 extending to the outside of the valve body 100 is located in the low temperature portion away from the valve For example, in combination with a step motor or a solenoid, it rotates within a predetermined angle range. The configuration of the present invention as described above will be described in more detail.

4 is a sectional view of the valve body according to the first embodiment of the present invention shown in FIG. 2, and FIG. 5 is a cross-sectional view of the switching port according to the first embodiment of the present invention shown in FIG. 6 is a cross-sectional view taken along the line A-A according to FIG. 5 for showing the shape of the flow path formed in the switching port.

First, referring to FIG. 4, a space portion 110 having a predetermined area for mounting a switching port is provided at the center of the valve body 100. The space portion 110 according to the first embodiment has a cross section thereof downward. It has an expanding structure. An inlet 120 through which a fluid flows is provided on the center line of the valve body 100 which communicates with the space part 110 up and down with respect to the space part 110, and is perpendicular to the inlet 120. Two outlet 130 is in communication with the space portion 110 to the left and right. Accordingly, the fluid introduced into the valve body 100 through the inlet 120 flows to one outlet side selectively opened by the switching port 200 among the two outlets 130.

The switching port 200 is located in the central space 110 formed in the valve body 100 to control the flow path of the fluid, as shown in Figures 5 to 6, the center of the lower conversion port 200 The first flow path 220 perforated up and down to and the second flow path 230 having a structure in which two flow paths are branched at substantially right angles on the same plane with respect to one end of the first flow path 220. Has The first flow path 220 is always in communication with the inlet 120 of the above-described valve body 100 after the valve assembly, the second flow path 230 to the valve body 100 in accordance with the rotation of the switching port 200 It is selectively in communication with any one of the two outlets 130 formed. Therefore, the fluid introduced through the valve body inlet 120 passes through the first flow path 220 and the second flow path 230, and through the outlet of any one selectively communicated with the second flow path 230. Get out.

The changeover port 200 has a size and an appearance corresponding to the space portion formed in the valve body 100. That is, the conversion port 200 also has a structure that the cross section is extended toward the lower portion. Accordingly, in the valve assembly state, the switching port 200 and the valve body 100 maintain the inclined contact relationship with each other. As such, when the two components maintain the inclined contact relationship, when the switching port 200 is thermally expanded due to the influence of a high temperature fluid, the switching port 200 is pushed downward in the space part 110 to have a larger space. Since the surface pressure acting on the outer surface of the conversion port 200 can be kept constant at all times.

The sealing member 300 is interposed between the valve body 100 and the switching port 200. The sealing member 300 is maintained within the valve body 100 through a flange 400 assembled from the upper and lower valve body 100, the flange 400 is fastening member (not shown) Through the valve body 100 can be disassembled / assembled. Therefore, when the sealing member 300 loses its function due to wear or breakage, the flange 400 may be separated from the valve body 100 to simply replace the worn or damaged sealing member 300.

Preferably, the sealing member 300 may be a sealing member made of graphite (graphite) material having almost no volume change or shape deformation even in a high temperature environment. When the sealing member of graphite material is applied in this way, it is preferable to intervene the elastic member S, for example, an elastic washer (or compression spring), between the sealing member and the switching port 200 (partially enlarged view of FIG. 3). Reference). In this case, the switching port 200 has the elastic force spaced apart from the sealing member 300 in the valve body 100 by the elastic member (S).

Reference numeral 410 denotes a flange coupled to both sidewalls of the valve body outlet side, and 420 denotes a socket integrally provided on the flange.

According to the first embodiment of the present invention, when the switching port is thermally expanded in a high temperature environment, the switching port 200 has a cross section in the space 110 of the valve body 100 by the volume change amount due to the thermal expansion. The expansion naturally pushes down along the slope, resulting in more space. That is, due to the flow of the changeover port 200, the surface pressure between the changeover port 200 and the valve body can always be kept constant.

Accordingly, the valve body generated when the inability to rotate the switching port 200 caused by the increase in the surface pressure due to thermal expansion or the expansion rate due to the thermal expansion of the switching port 200 exceeds the endurance limit of the valve body 100. Shape deformation or breakage of the 100 can be prevented.

In addition, according to the present invention, the sealing member 300 of graphite material is applied, so that an appropriate sealing function may be maintained even in a high temperature environment. As a result, even when the target fluid for flow control is a high temperature, proper sealability is maintained so that the fluid does not leak to the outside.

On the other hand, Figure 7 is a cross-sectional view of a three-way valve according to a second embodiment of the present invention, the space portion 110 formed in the center of the valve body 100 and the switching port 200 is provided in the space portion 110 The configuration and operation are the same as those of the above-described first embodiment except for the configuration having an enlarged cross section over the valve body 100. Therefore, detailed description thereof will be omitted.

What has been described above is only some embodiments for carrying out the present invention, and the present invention is not limited to the above-described embodiments, and the present invention may be made without departing from the gist of the present invention as claimed in the following claims. Anyone with ordinary knowledge in the field will have the technical spirit of the present invention to the extent that various modifications can be made.

1a to 1b is a sectional view showing the structure and operating state of a conventional three-way valve.

Figure 2 is an exploded perspective view showing the overall configuration of the three-way valve for high temperature fluid according to the first embodiment of the present invention.

3 is a cross-sectional view of the three-way valve shown in FIG.

4 is a cross-sectional view of the valve body according to the first embodiment of the present invention shown in FIG.

5 is a cross-sectional view of the conversion port according to the first embodiment of the present invention shown in FIG.

6 is a cross-sectional view taken along the line A-A according to FIG.

7 is a cross-sectional view of a three-way control valve for high temperature fluid according to a second embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100.Valve body 110 ... Space

120 Exit 130 Exit

200 ... Switching port 210 ... Control shaft

220 ... first euro 230 ... second euro

300 ... sealing member 400 ... flange

Claims (7)

In the three-way valve, A valve body having an inlet and a plurality of outlets for fluid movement, A switching port having a three-way open flow path in the center of the valve body for diverting fluid flow flowing through the valve body and in communication with the inlet and the plurality of outlets, The switching port is a three-way control valve for high temperature fluid, characterized in that the device is movable in the valve body in accordance with the volume change due to thermal expansion. The method of claim 1, The space in the center of the valve body where the switching port is to be installed and the switching port installed in the space have a structure in which the cross section is extended toward the lower portion of the valve body. When the switching port is thermally expanded, the inclined contact between the cross sections is expanded. The three-way control valve for high temperature fluid, characterized in that the switching port is moved downward in the space. The method of claim 1, The space in the center of the valve body in which the switching port is to be installed and the switching port installed in the space have a structure in which a cross section expands toward the upper portion of the valve body, and when the switching port is thermally expanded, The three-way control valve for high temperature fluid, characterized in that the switching port is moved up in the space. The method of claim 1, Three-way control valve for high temperature fluid, characterized in that the sealing member for sealing the valve body is installed on the upper and lower portions of the switching port. The method of claim 4, wherein Sealing member is a three-way control valve for high temperature fluid, characterized in that the restrained state is maintained in the valve body by a flange fastened to the valve body. The method according to claim 4 or 5, Three-way control valve for high temperature fluid, characterized in that the sealing member is made of graphite material. The method of claim 6, When the sealing member of the graphite material is applied, the three-way control valve for high temperature fluid, characterized in that the elastic member is interposed between the sealing member and the switching port.

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