JP2021139420A - Valve mechanism - Google Patents

Abstract

To provide a valve mechanism capable of easily and precisely disposing a valve seat and a valve body in a proper positional relationship, and accurately performing flow rate adjustment.SOLUTION: When assembling a bypass valve 1, a support shaft 5 is inserted in a bearing space 25 of a valve seat 2, thereby precisely deciding a positional relationship of a valve body 4 and a valve seat 2, and easily and certainly performing the centering of the valve body 4 and the valve seat 2. Therefore, a positional deviation of a valve port 21 of the valve seat 2 and the valve body 4 can be avoided, and the flow rate adjustment with high accuracy of the bypass valve 1 can be realized.SELECTED DRAWING: Figure 1

Description

The valve mechanism according to the present application relates to a technique for a valve structure for controlling a fluid flow.

As a valve mechanism for controlling the flow of fluid, there is a nozzle type steam trap disclosed in Patent Document 1 described later. This nozzle-type steam trap is installed in a steam piping system and discharges drain (condensed water) generated by heat exchange of steam to the outside of the piping, but the amount of drain discharge can be adjusted.

In the nozzle-type steam trap according to Patent Document 1, a nozzle 5 is arranged between the drain inlet 11 and the drain outlet 12, and the first drain chamber 15 and the first drain chamber 15 and the drain chamber 15 are located between the nozzle 5 and the outlet 12. A second drain chamber 17 is provided. A control valve 6 having a needle 62 is attached to the second drain chamber 17, and the tip of the needle 62 is arranged toward the port 18 communicating with the second drain chamber 17. The tip of the needle 62 has a conical shape.

The adjusting valve 6 can be operated from the outside of the steam trap, and by operating the adjusting valve 6, the needle 62 moves up and down in the figure. As the needle 62 moves forward and backward, the gap between the slope of the conical surface at the tip and the entrance of the port 18 changes, and the area of the entrance of the port 18 changes. Thereby, the flow rate of the drain passing through the port 18 can be adjusted (Patent Document 1, paragraph numbers [0022], [0023]).

Japanese Unexamined Patent Publication No. 2019-15341

In the above-mentioned nozzle type steam trap, the flow rate of the drain is adjusted by moving the needle 62 forward and backward to change the gap between the slope of the conical surface at the tip of the needle 62 and the inlet of the port 18. For this reason, when assembling the nozzle-type steam trap, if the needle 62 and the port 18 are arranged in a misaligned state, there is a disadvantage that the accuracy of the flow rate adjustment of the nozzle-type steam trap is lowered. ..

That is, for the valve mechanism that controls the flow rate of the fluid by moving the valve body with respect to the valve seat and adjusting the opening degree of the flow path formed in the valve seat, the valve seat is used to adjust the flow rate accurately. The positional relationship between the valve body and the valve body must be accurately arranged. However, when assembling in the manufacturing process of a product, it is difficult to accurately arrange the positional relationship between the valve seat and the valve body, and it is not easy to obtain a valve mechanism capable of adjusting the flow rate with high accuracy. In addition, during maintenance, the valve mechanism may be disassembled and assembled, and in this case, the positional relationship between the valve seat and the valve body may shift, and the accuracy of flow rate adjustment may decrease.

Therefore, in order to solve these problems, the valve mechanism according to the present application can easily and accurately arrange the valve seat and the valve body so as to have an appropriate positional relationship, and can adjust the flow rate with high accuracy. The task is to provide a mechanism.

The valve mechanism according to the present application is
The body through which the fluid passes inside,
A valve seat portion provided inside the main body and in which a valve seat flow path through which a fluid passes is formed.
A valve body means provided inside the main body, which moves toward the valve seat flow path of the valve seat portion and adjusts the opening degree of the valve seat flow path.
In the valve mechanism equipped with
Valve seat side connection formed on the valve seat,
Valve body side connection formed in the valve body means,
Is equipped with
The positional relationship between the valve seat and the valve body means is determined by the connection between the valve seat side connection and the valve body side connection.
It is characterized by that.

In the valve mechanism according to the present application, the positional relationship between the valve seat portion and the valve body means is determined by the connection between the valve seat side connection portion and the valve body side connection portion. Therefore, the valve seat portion and the valve body means can be easily and accurately arranged so as to have an appropriate positional relationship, the accuracy of the valve seat flow path opening adjustment is improved, and the flow rate adjustment is performed with high accuracy. Can provide a valve mechanism capable of

It is a partial cross-sectional view of the bypass valve 1 which shows the 1st Embodiment of the valve mechanism which concerns on this application. It is a partial cross-sectional view of the bypass valve 1 which shows the state before attaching the valve seat 2 shown in FIG. 1 to a casing 11. It is a block diagram of the piping system for explaining the function of a bypass valve 1.

[Explanation of terms in the embodiment]
The main terms shown in the embodiments correspond to the following elements of the valve mechanism according to the present application, respectively.

Valve seat 2 ・ ・ ・ Valve seat part Valve body 4 ・ ・ ・ Valve body means Support shaft 5 ・ ・ ・ Valve body side connection part Casing 11 and casing lid 31 ・ ・ ・ Main body bearing space 25 ・ ・ ・ Valve seat side connection part Valve seat Inner flow path 29 ・ ・ ・ Valve seat flow path Center line L1 ・ ・ ・ Central axis drain or air, etc. ・ ・ ・ Fluid

[First Embodiment]
The first embodiment of the valve mechanism according to the present application will be described by taking a bypass valve as an example.

(Explanation of bypass valve function)
FIG. 3 is a block diagram of a piping system for steam transfer installed in an industrial plant or the like. The main pipe 70 transfers high-temperature and high-pressure steam to a predetermined supply destination facility. Drain is generated in the main pipe 70 by heat exchange of the transferred steam, and in order to discharge this drain, branch pipes 71 are connected to the main pipe 70 everywhere, and steam traps 79 are provided in each branch pipe 71. The steam trap 79 is an automatic valve that operates to properly discharge the drain to the outside of the pipe (not shown) and to prevent steam from leaking as much as possible.

There are various types of steam traps, but float traps have a hollow float built into the valve chamber. Normally, this float closes the drain outlet formed near the bottom of the valve chamber, but when drain flows into the valve chamber, this float floats as the drain stays, and the drain outlet is opened. Open.

Since the drain discharge port is opened, the drain accumulated in the valve chamber is automatically discharged from the drain discharge port toward the drain recovery pipe 72 in response to the high pressure in the pipe. After draining the drain, the float descends and returns to its original position, closing the drain outlet again.

Here, the branch pipe 71 is provided with a bypass pipe 73 connecting the front and rear of the steam trap 79, and the bypass valve 1 is attached to the bypass pipe 73. The bypass valve 1 backs up and assists the steam trap 79 provided on the branch pipe 71.

That is, when it becomes necessary to replace the steam trap 79 due to a device failure or the like, the on-off valves 74 and 75 arranged in front of and behind the steam trap 79 are closed and the replacement work is performed. It will not be possible to discharge. Therefore, the bypass valve 1 is opened, and the drain is discharged through the bypass pipe 73 while the steam trap 79 is being replaced.

Further, when the piping system is started, the piping is filled with initial air, and in order to eliminate the air binding (air obstruction) caused by the initial air, it is necessary to exhaust the initial air to the outside of the piping. In such a case, by fully opening the bypass valve 1, exhaust is promptly performed through the bypass pipe 73. Further, in order to supplement the drain discharge function of the steam trap 79, the degree of opening of the bypass valve 1 may be adjusted, and a small amount of drain may be discharged through the bypass pipe 73 at all times. Therefore, such a bypass valve 1 generally has a function of finely adjusting the flow rate of the fluid.

(Explanation of configuration and operation of bypass valve 1)
Next, the overall configuration of the bypass valve 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a partial cross-sectional view of the bypass valve 1, and FIG. 2 is a partial cross-sectional view of the bypass valve 1 showing a state before the valve seat 2 is attached to the casing 11.

As shown in FIGS. 1 and 2, the bypass valve 1 includes a casing 11 and a casing lid 31, and the casing 11 and the casing lid 31 are fixed by bolts 69. A cylindrical downstream inner chamber 10 that opens toward the upper part is formed in the casing 11, and the casing lid 31 is attached so as to cover the upper opening of the downstream inner chamber 10. A gasket 30 is interposed between the casing 11 and the casing lid 31, so that the airtightness of the downstream inner chamber 10 and the like is maintained.

Further, in the casing 11, the inflow port 12 and the outflow port 13 are formed coaxially, and a bypass pipe 73 (FIG. 3) is connected to each of them. The inflow port 12 communicates with the upstream passage 15 and the upstream inner chamber 16 in the casing 11. The upstream inner chamber 16 is arranged below the downstream inner chamber 10 described above and communicates with the downstream inner chamber 10. The downstream inner chamber 10 further communicates with the outflow port 13 via the downstream passage 17. The upstream inner chamber 16 is open toward the bottom of the casing 11.

A cylindrical valve seat 2 is located at a communication portion between the downstream inner chamber 10 and the upstream inner chamber 16. A valve seat internal flow path 29 is formed inside the valve seat 2, and the central axis of the valve seat internal flow path 29 is located on the center line L1 which is the reference line of the bypass valve 1. The flow path 29 in the valve seat is open toward the upper end side of the valve seat 2, and this opening portion is the valve opening 21. In addition, according to the flow direction of the fluid, the lower side of the valve port 21 is the upstream side and the upper side is the downstream side in FIGS. 1 and 2.

A valve seat screw portion 2a is formed on the outer circumference of the lower end of the valve seat 2, and the valve seat 2 is screwed into the casing screw portion 11a formed on the inner circumference of the bottom opening of the casing 11 so that the valve seat 2 is formed in the casing 11. Attached to. Gaskets 61 and 62 are attached to the outer periphery of the valve seat 2 to maintain the airtightness of the upstream inner chamber 16 and the like and the downstream inner chamber 10 and the like, respectively.

A plurality of flow path holes 22 are formed on the side portion of the valve seat 2 toward the flow path 29 in the valve seat. Further, a bearing space 25 communicating with the flow path 29 in the valve seat is formed on the lower end side of the valve seat 2. The bearing space 25 is formed so that the central axis is located on the center line L1.

As shown in FIGS. 1 and 2, a casing lid hole 31a is formed in the casing lid 31 so that the central axis is located on the center line L1, and a bar-shaped operating member 50 is formed in the casing lid hole 31a. It is arranged in a penetrating state. The central axis of the operating member 50 is also located on the center line L1. The operation member 50 includes an operation bar 51 on which a screw portion 50b is formed, and the screw portion 50b is screwed into a screw groove formed on the inner surface of the casing lid hole 31a and attached.

Further, an operation groove 50a is formed at the rear end of the operation bar 51. Then, when the tool is fitted into the operation groove 50a and the rotation operation is performed, the operation member 50 moves up and down in the directions of arrows 95 and 96 according to the screw mechanism of the screw portion 50b. A cap 38 is screwed and attached to the upper part of the casing lid 31, and the cap 38 is located so as to cover the rear end of the operation bar 51. The cap 38 prevents rotation of the operation bar 51 due to erroneous operation.

The diameter of the upper part of the casing lid hole 31a is slightly larger, and the packing 36 is fitted therein. Then, the packing 36 is pressurized by screwing the pressing member 37, and the airtightness inside the casing 11 is maintained. The operation bar 51 of the operation member 50 penetrates the central hole of the packing 36 and the pressing member 37.

A valve body 4 is fixed to the tip end side of the operation bar 51. The central axis of the valve body 4 is located along the center line L1. The valve body 4 has a cylindrical portion 40 having a shape corresponding to the valve opening 21 of the valve seat 2, and a valve body flange portion 42 larger than the valve opening 21 is provided above the cylindrical portion 40. I have. Further, the valve body 4 has a valve body slope portion 41 whose diameter gradually decreases downward.

Further, a bar-shaped (for example, round bar-shaped) support shaft 5 is formed so as to protrude from the lower center of the valve body 4. The central axis of the support shaft 5 is arranged so as to be located on the center line L1. Then, the support shaft 5 penetrates the flow path 29 in the valve seat of the valve seat 2 and is positioned in a state of being inserted into the bearing space 25 formed on the lower end side of the valve seat 2 as shown in FIG. In addition, in FIGS. 1 and 2, the operation member 50, the valve body 4, and the support shaft 5 are shown not as a cross-sectional view but as a side view showing an appearance.

Since the bearing space 25 is formed long in the vertical direction, the integrally configured operating member 50, the valve body 4, and the support shaft 5 can slide up and down along the directions of arrows 95 and 96. The diameter of the cross section of the support shaft 5 is substantially the same as the inner diameter of the bearing space 25, and rattling in the lateral direction is prevented.

The bypass valve 1 having the above configuration adjusts the flow rate of a fluid such as drain or air by the following operations. Drain, air, etc. flowing in from the inflow port 12 enter the upstream inner chamber 16 from the upstream passage 15 along the direction of arrow 91, and further enter the upstream inner chamber 16 from the flow path hole 22 formed in the valve seat 2 to enter the valve seat inner flow path 29. Inflow to. Then, drain, air, and the like flow out from the valve port 21 of the valve seat 2 to the downstream inner chamber 10 along the direction of arrow 92, and are further discharged from the bypass valve 1 through the downstream passage 17 and the outflow port 13.

FIG. 1 shows a state in which the integrally configured operating member 50, the valve body 4, and the support shaft 5 are moved up to the limit position in the direction of arrow 96. Therefore, the valve port 21 of the valve seat 2 is completely open, and the flow rate of drain, air, etc. is maximized. Since the diameter of the cross section of the support shaft 5 is formed to be sufficiently smaller than the diameter of the flow path 29 in the valve seat, the support shaft 5 does not actually interfere with the flow of drain, air, etc. ..

To adjust the flow rate of the bypass valve 1, first remove the cap 38 above the bypass valve 1, insert a tool into the operation groove 50a formed at the rear end of the operation bar 51, and tighten the operation bar 51. .. According to this tightening operation, the operating member 50, the valve body 4, and the support shaft 5 are integrally lowered in the direction of arrow 95.

Then, after the valve body slope portion 41 of the valve body 4 enters the valve opening 21, the opening area of the valve opening 21 gradually decreases according to the inclination of the valve body slope portion 41 (not shown), which corresponds to this. As a result, the flow rate of drainage and air decreases. When the operating member 50, the valve body 4, and the support shaft 5 are lowered to the limit positions, the valve port 21 is closed by the valve body flange portion 42 of the valve body 4 and completely closed (not shown). When the operation bar 51 is loosened in the reverse direction from this valve closed state, the operation member 50, the valve body 4, and the support shaft 5 are integrally gradually raised along the direction of arrow 96, and the opening area of the valve port 21 is increased. It gradually increases according to the inclination of the body slope 41, and the flow rate of drain, air, etc. increases correspondingly.

That is, the gap between the valve port 21 and the valve body 4 can be adjusted according to the rotation operation of the operation bar 51, thereby controlling the opening degree of the valve port 21 and arbitrarily setting the flow rate of drain, air, etc. can do. Since the opening degree of the valve port 21 is controlled by the valve body slope portion 41 formed on the valve body 4, the flow rate can be finely adjusted.

Here, during the assembly work in the manufacturing process of the bypass valve 1, the support shaft 5 can be inserted into the bearing space 25 of the valve seat 2 to accurately determine the positional relationship between the valve body 4 and the valve seat 2. It is possible to easily and surely center the valve body 4 and the valve seat 2.

That is, as shown in FIG. 2, the valve seat 2 is screwed in from the bottom opening of the casing 11 and attached. In this case, the support shaft 5 is inserted into the bearing space 25 of the valve seat 2. As described above, since the central axis of the support shaft 5 and the valve body 4 and the central axis of the bearing space 25 are all located on the center line L1, the central axis of the valve body 4 and the central axis of the valve seat 2 Can be easily and accurately matched. As a result, it is possible to avoid a misalignment between the valve port 21 of the valve seat 2 and the valve body 4, and it is possible to realize highly accurate flow rate adjustment of the bypass valve 1.

In addition, during maintenance, the valve seat 2 may be removed from the bypass valve 1 and the valve seat 2 may be reattached. In this case as well, the support shaft 5 is inserted into the bearing space 25 of the valve seat 2 and the valve is valved. The positional relationship between the body 4 and the valve seat 2 can be accurately determined, and the valve body 4 and the valve seat 2 can be centered easily and reliably. Therefore, it is possible to avoid the misalignment between the valve port 21 of the valve seat 2 and the valve body 4 due to maintenance.

In the present embodiment, a cap portion screwed into the bottom opening of the casing 11 is integrally formed with the valve seat 2. Therefore, the valve seat 2 can be taken out at the same time only by removing the cap portion from the bottom opening of the casing 11, and it is not necessary to remove the casing lid 31 when taking out the valve seat 2, and the maintenance work efficiency can be improved.

Further, in the present embodiment, since the central axes of the support shaft 5 and the bearing space 25 are located on the center line L1, only by providing the pair of support shafts 5 and the bearing space 25, the valve body 4 and the valve seat are provided. Centering of 2 can be performed reliably.

[Other Embodiments]
In the above-described embodiment, the bypass valve 1 has been exemplified as the valve mechanism, but the present invention is not limited to this, and the valve body means moves toward the valve seat flow path of the valve seat portion, and the valve seat flow path The valve mechanism according to the present application can be applied to a valve having another structure and function as long as the opening degree is adjusted.

Further, in the above-described embodiment, the valve seat 2 and the bearing portion 25 are exemplified as the valve seat portion and the valve seat side connecting portion, respectively, and the valve body 4 and the support shaft 5 are exemplified as the valve body means and the valve body side connecting portion, respectively. However, the present invention is not limited to this, and other configurations can be adopted for each.

For example, in the above-described embodiment, the support shaft 5 is integrally fixed to the valve body 4 side to form the bearing portion 25 on the valve seat 2 side, but conversely, the support shaft 5 is supported on the valve seat 2 (valve seat portion) side. The shaft 5 may be fixed as the valve seat side connection portion, and the bearing portion 25 may be formed as the valve body side connection portion on the valve body 4 (valve body means) side. Further, as long as both can be connected, a valve body side connection portion and a valve seat side connection portion having a shape and structure different from those of the support shaft 5 and the bearing portion 25 can be adopted.

Further, in the above-described embodiment, the pair of support shafts 5 (valve side connection portion) and the bearing portion 25 (valve seat side connection portion) are arranged along the center line L1, but two or more pairs of valve body side connection portions are arranged. And a valve seat side connection portion can also be provided. In this case, the valve body side connection portion and the valve seat side connection portion do not necessarily have to be arranged along the center line L (center axis).

2: Valve seat 4: Valve body 5: Support shaft 11: Casing 31: Casing lid
25: Bearing space 29: Flow path in valve seat L1: Center line

Claims (2)

The body through which the fluid passes inside,
A valve seat portion provided inside the main body and in which a valve seat flow path through which a fluid passes is formed.
A valve body means provided inside the main body, which moves toward the valve seat flow path of the valve seat portion and adjusts the opening degree of the valve seat flow path.
In the valve mechanism equipped with
Valve seat side connection formed on the valve seat,
Valve body side connection formed in the valve body means,
Is equipped with
The positional relationship between the valve seat and the valve body means is determined by the connection between the valve seat side connection and the valve body side connection.
A valve mechanism characterized by that. In the valve mechanism according to claim 1,
The valve seat side connection portion and the valve body side connection portion are arranged along the central axis of the valve seat portion and the valve body means, respectively.
A valve mechanism characterized by that.

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