JP3001771U - Pressure control valve - Google Patents

Abstract

(57) [Abstract] [Purpose] Providing a pressure adjustment valve for setting and adjusting the pressure of fluid such as gas or liquid. In a pressure regulating valve 1 in which a pressure set by a pressure regulating mechanism 4 having a compression spring means 30 is applied to one side of a diaphragm 17 that drives a valve rod 11 and a secondary pressure of the valve is applied to the other side, The spring means 30 includes compression springs 30a, 30b, 30c arranged in series, the spring constants of which are successively increased. The low pressure setting is set by the compression spring 30a having a substantially small spring constant, and the compression springs 30b and 30c having a larger spring constant are sequentially set as the pressure setting becomes higher. Therefore, the pressure setting can be finely and finely adjusted when the pressure is low, and the predetermined pressure can be quickly set even when the pressure is high.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure adjusting valve for accurately adjusting the pressure of a fluid such as gas or liquid over a wide range.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, there is known a pressure regulating valve in which one side of a diaphragm that drives a valve rod is applied with a set pressure by a pressure regulating mechanism having a compression spring means and the other side is applied with a secondary pressure of the valve. FIG. 4 shows an example of such a pressure regulating valve. The pressure regulating valve 1 is mainly composed of a valve body 2 and a casing 3 formed in a bottomed cylinder, and the casing 3 is provided with a pressure regulating mechanism 4. It is installed. The valve body 2 is provided with an upstream or primary side connection port 5 for fluid, a downstream or secondary side connection port 6 for fluid, a valve chamber 7 communicating with these connection ports 5, 6, and the valve chamber 7. A valve seat 8 and a passage 9 communicating with the connection port 6 on the secondary side.

A valve rod 11 having a first valve body 10 provided at a lower end thereof is arranged on the valve seat 8, and the valve rod 11 is slidably penetrated through a through hole provided at an upper portion of the valve body 2 and an upper end thereof is provided. Is provided with a second valve body 14 that constitutes the relief valve 13. A compression spring 10a for pushing the first valve body 10 upward is provided in the valve chamber 7 below the first valve body 10. A flange 15 is provided on the upper portion of the valve body 2, and is bolted (not shown) to a flange 16 provided on the lower end of the casing 3. A diaphragm 17 made of a material having flexibility and elasticity such as a metal plate such as a thin stainless plate or a rubber plate is sandwiched between the flanges 15 and 16 and is surrounded by the diaphragm 17 and the upper portion of the valve body 2. A back pressure chamber 18 communicating with the passage 9 is formed. A valve seat 19 constituting the relief valve 13 is arranged so as to pass through a hole provided at the center of the diaphragm 17.

The pressure adjusting mechanism 4 has an adjusting knob 20, a spring pressing member 22 pressed by a shaft 21 of the adjusting knob 20, and a diaphragm pressing member 23, and between the spring pressing member 22 and the diaphragm pressing member 23. A compression spring 24 is arranged. The shaft 21 of the adjusting knob 20 is screwed onto the upper part of the casing 3 to be rotatable, and is locked by a lock nut 25 so that the shaft 21 can be engaged and disengaged. A communication hole 26 is provided in the side wall of the casing 3 for opening the relief valve 13. The pressure adjusting mechanism of the pressure adjusting valve 1 will be described. First, the adjusting knob 20 is rotationally adjusted to compress the compression spring 24 with a force corresponding to the pressure setting value, and the setting force is applied via the diaphragm pressing member 23. Add to one side of diaphragm 17. Then, the valve rod 11 is moved downward to form a gap between the upper surface of the first valve body 10 and the valve seat 8.

On the other hand, the fluid that has flowed into the valve chamber 7 from the connection port 5 on the primary side passes through the gap between the valve seat 8 and the first valve body 10 and flows out from the connection port 6 on the secondary side. The pressure on the side is introduced into the back pressure chamber 18 through the passage 9, and the secondary pressure is applied to the lower side of the diaphragm 17, and a force for lifting it is applied. As a result, the diaphragm 17 is held at a position where the set force of the compression spring 24 and the secondary pressure are in equilibrium, and accordingly the position of the first valve body 10 is maintained. By this equilibrium action, the pressure on the secondary side of the pressure control valve 1 is adjusted to the pressure set by the adjustment knob 20. When the pressure on the secondary side rises excessively from the set pressure, the pressure in the back pressure chamber 18 rises, which causes the diaphragm 17 to be deformed upward much more than the normal range and the relief valve 13 opens. , The fluid is discharged into the casing 3. Then, due to the discharge, the secondary pressure is reduced to the set pressure by the compression spring 24 and is balanced. Further, if the adjusting knob 20 is further screwed to increase the pressure set value of the compression spring 24, the secondary pressure can be set to the set value. Therefore, the range in which the pressure can be set depends at least on the spring characteristics of the compression spring 24.

[0006]

[Problems to be solved by the device]

 However, the conventional pressure control valve has a problem that the range of pressure that can be precisely adjusted is narrow due to the limitation due to the characteristics of the compression spring used. That is, in the case where the pressure can be adjusted over a wide range from low pressure to high pressure, both the setting accuracy and the pressure adjustment accuracy of the low pressure portion are usually low, and precise adjustment cannot be practically expected especially near zero. Therefore, when it is necessary to accurately adjust the range from near zero to high pressure, prepare a pressure control valve to control the low pressure range and a pressure control valve to control the high pressure range, and connect them to the pipe. Was installed in parallel to the. However, such a method has problems that the operation is complicated and costly, and the installation space for the pressure regulating valve and the piping space are wide. In view of the problems in the conventional pressure regulating valve as described above, an object of the present invention is to provide a pressure regulating valve capable of precisely regulating a wide range of pressure with a single valve.

[0007]

[Means for Solving the Problems]

 That is, the present invention is a pressure regulating valve in which one side of a diaphragm for driving a valve rod receives a set pressure by a pressure regulating mechanism having a compression spring means and the other side receives a secondary pressure of the valve. The compression spring means is configured such that its spring constant increases as the compression force increases. The pressure adjusting mechanism in the preferred embodiment of the present invention is provided with an adjusting knob, a spring pressing member pressed by the rotation of the adjusting knob, and a diaphragm pressing member. A compression spring means composed of a plurality of compression springs having different spring constants is arranged between the spring pressing member and the diaphragm pressing member. It is particularly preferable that the plurality of compression springs are arranged in series via movable intermediate members.

Further, in another preferred embodiment of the present invention, the plurality of compression springs arranged between the spring holding member and the diaphragm holding member as described above have a diameter proportional to the spring constant. Composed of a combination of compression springs. The compression bars are arranged concentrically in order from the smallest diameter to the largest diameter via an intermediate member made of a movable bottomed cylinder having a flange at the opening edge. Further, the end of the compression spring in contact with the intermediate member is brought into contact with the bottom surface of the bottomed tubular body, and the end of another compression spring adjacent thereto is brought into contact with the flange. Further, in another preferred embodiment of the present invention, as described above, the plurality of compression springs arranged between the spring pressing member and the diaphragm pressing member have different diameters, and the spring pressing members of the compression springs are different from each other. The respective end positions on the member side are sequentially displaced in the axial direction, and are arranged concentrically in order from the smaller diameter to the larger diameter.

[0009]

[Action / effect]

 The compression spring means for adjusting pressure in the present invention is constructed so that its spring constant increases as the compression force increases. Therefore, the relationship between the compression distance of the compression spring and the resulting compression force is not linear but nonlinear. That is, the compression distance required to increase the compression force is relatively large in the range where low compression force is generated, and the compression distance required to increase the compression force is relatively small value in the range where high compression force is generated. Become. Therefore, for example, when adjusting the pressure by rotating the adjustment knob, the scale expansion effect can be used when setting a low pressure, and fine adjustment can be performed accurately by a large rotation, while the compression effect can be adjusted when setting a high pressure. This makes it possible to quickly set the desired pressure with a few rotations.

Further, when the pressure is set to a low value, the spring constant becomes low accordingly. Therefore, the pressure is set in the same state as when a delicate spring having a relatively small compressive force adapted to the low pressure setting is used. Adjustments are made. As a result, the sensitivity is relatively improved, and even a slight pressure fluctuation can be accurately responded to, and more precise pressure adjustment can be performed. On the contrary, when the pressure is set to a high value, the spring constant increases accordingly, so the pressure is adjusted in the same state as when using a powerful spring with a relatively large compressive force that is suitable for a high pressure setting. . For this reason, the sensitivity is relatively lowered, and it is possible to perform stable pressure adjustment without following small pressure fluctuations. As described above, according to the pressure regulating valve of the present invention, it is possible to precisely regulate a wide range of pressure with a single valve.

[0011]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an example of the pressure regulating valve of the present invention. The only difference from the conventional pressure regulating valve shown in FIG. 4 is the shape of the casing and the compression spring portion of the pressure regulating mechanism 4, and the rest is substantially the same (note that the same elements as in FIG. No. is attached). The casing 3 is composed of a cylindrical main body 3a, an upper plate 3b, a lower ring plate 3c, and a plurality of fastening bolts 3d axially attached to the outer side thereof.

A compression spring means 30 configured by combining a plurality of compression springs having different spring constants is arranged between the spring pressing member 22 and the diaphragm pressing member 23 in the pressure adjusting mechanism 4 of the pressure adjusting valve 1. In this example, three coil spring type compression springs 30a, 30b, 30c having a spring constant that is increased from top to bottom are arranged in series via metal intermediate members 31 and 32 each having a bottomed cylinder. Has been done. By using the intermediate members 31 and 32, the compressive force transmissibility of the compression springs 30a, 30b, and 30c can be improved. Further, by forming the intermediate members 31 and 32 as bottomed cylindrical bodies, the stability of the compression springs 30a, 30b and 30c in the lateral direction can be further enhanced. As the intermediate members 31 and 32, it is also possible to use a plate material provided on its surface with a projection for holding the end portion of the compression spring, a hooking portion, or the like.

Next, the operation of the pressure adjusting mechanism 4 will be described. When the adjusting knob 20 for setting the pressure is rotated to the pressure increasing side, the shaft 21 thereof descends relative to the casing 3 and presses the spring pressing member 22, thereby resisting the elastic force of the compression springs 30a, 30b, 30c. And compress them. At that time, when the pressure setting is low, the pressure is set substantially by the upper compression spring 30a having the smallest spring constant (however, the increase of the compression force is equally applied to each compression panel). The rotation of the adjusting knob 20 at this time becomes relatively large in accordance with the spring constant of the compression spring 30a, so that accurate pressure setting is possible. This state continues until the compression limit of the compression spring 30a, that is, the spring pressing member 22 contacts the upper intermediate member 31. When the spring retainer member 22 abuts on the upper intermediate member 31, a further set pressure is made substantially by the next compression spring 30b, and when the compression limit is exceeded, a higher pressure setting is made by the compression spring 30c. Done. As the pressure is set by the compression spring having a high spring constant, the change in the set pressure per rotation angle of the adjustment knob 20 increases, so that the change rate according to the level of the set pressure is set more quickly. The pressure can be set. When lowering the pressure setting, the reverse operation is performed.

FIG. 2 is a cross-sectional view showing another example of the pressure regulating valve of the present invention. The parts different from the example of FIG. 1 are the shapes of the compression springs 30a, 30b, 30c and the intermediate members 31, 32 and the mutual parts. Other than that, only the positional relationship is the same. In this example, the spring constant increases in the order of the compression springs 30a, 30b, 30c, but the diameter also increases accordingly. The diameter of the intermediate member 31 formed of a bottomed cylinder is set to an intermediate value between the diameters of the compression springs 30a and 30b, and the diameter of the intermediate member 32 is set to an intermediate value between the diameters of the compression springs 30b and 30c. Therefore, as shown in FIG. 2, the coil spring type compression springs are arranged concentrically so that at least some of them overlap in the axial direction. With this structure, the pressure adjusting mechanism 4 and the casing 3 can be shortened in comparison with the example of FIG. 1, so that the pressure adjusting valve can be made more compact. The operation of the pressure adjusting mechanism 4 in FIG. 2 is similar to that in the case of FIG. 1, and therefore its explanation is omitted.

FIG. 3 is a cross-sectional view showing still another example of the pressure regulating valve of the present invention, in which the shapes of the compression springs 30 a, 30 b and 30 c and their mutual positional relationship and the intermediate members 31 and 32 are replaced. 2 is different from the example of FIG. 2 in that the cylindrical support portions 35, 33, 34 are used, and the other configurations are the same. Also in this example, the spring constant is increased in the order of the compression springs 30a, 30b, 30c, and the diameter thereof is also increased accordingly. A cylindrical support member 34 is joined to the outer periphery of the cylindrical valve seat 19 of the relief valve 13 protruding upward from the center of the diaphragm 17 by fitting or the like. Further, a cylindrical support member 33 having a smaller diameter is integrally provided on the upper surface of the support member 34, and a cylindrical support member 35 having a smaller diameter is integrally provided on the upper surface of the support member 33. There is. The support members 35, 33, 34 can be integrally formed by cutting or the like, but they may be formed as separate parts and integrally formed by welding, bonding, or the like.

Each of the compression springs 30a, 30b, 30c is of a coil spring type, and the lower inner peripheral portions of the compression springs 30a, 30b, 30c are fitted to and supported by the outer peripheral portions of the supporting portions 35, 33, 34, respectively, and are concentric with each other. It is arranged. Therefore, the positions of the respective upper end portions of the compression springs 30a, 30b, 30c on the side of the spring pressing member 22 are shifted so as to approach the side of the spring pressing member 22. FIG. 3 shows a state in which the pressure is set relatively low. Only the end of the compression spring 30a at the uppermost end is brought into contact with the spring pressing member 22, and the upper ends of the other compression springs 30b and 30c are pressed against the spring pressing member. It is separated from 22. A communication hole 32a is provided in the central portion of each of the support portions 35, 33, 34 in the axial direction so that the fluid when the relief valve 13 operates can be discharged into the casing.

Next, the operation of the pressure adjusting mechanism 4 will be described. When the adjusting knob 20 for setting the pressure is rotated to the pressure increasing side, the shaft 21 thereof is lowered relative to the casing 3, thereby pressing the spring pressing member 22 and resisting the elastic force of the compression spring 30a. Compress it. The rotation of the adjusting knob 20 at this time becomes relatively large in accordance with the compression spring 30a at the uppermost end having the smallest spring constant, so that accurate pressure setting is possible. This state continues until the compression limit of the compression spring 30a, that is, the spring pressing member 22 contacts the upper end of the compression spring 30b. When the set value of the pressure is further increased, the spring pressing member 22 abuts on the upper end of the intermediate compression spring 30b, and the further set pressure is substantially exerted by the compression spring 30b. When the set value of the pressure is further increased, the compression spring 30b exceeds its compression limit, and the set pressure beyond that is substantially made by the compression spring 30c. As the pressure is substantially set by the compression springs having the higher spring constants in this manner, the change in the set pressure per rotation angle of the adjustment knob 20 increases, so that the rate of change according to the level of the set pressure becomes higher. The predetermined pressure can be set quickly. Note that when lowering the pressure setting, the operation is reverse to the above.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a pressure regulating valve of the present invention.

FIG. 2 is a sectional view showing another example of the pressure regulating valve of the present invention.

FIG. 3 is a sectional view showing still another example of the pressure regulating valve of the present invention.

FIG. 4 is a sectional view showing an example of a conventional pressure regulating valve.

[Explanation of symbols]

 1 Pressure Control Valve 2 Valve Body 3 Casing 3a Body 3b Upper Plate 3c Lower Ring Plate 3d Fastening Bolt 4 Pressure Regulator 5 Primary Side Connection Port 6 Secondary Side Connection Port 7 Valve Chamber 8 Valve Seat 9 Passage 10 First Valve Body 10a Compression spring 11 Valve rod 13 Relief valve 14 Second valve body 15 Flange 16 Flange 17 Diaphragm 18 Back pressure chamber 19 Valve seat 20 Adjustment knob 21 Shaft 22 Spring holding member 23 Diaphragm holding member 24 Compression spring 25 Lock nut 26 Communication hole 30 compression spring means 30a compression spring 30b compression spring 30c compression spring 31 intermediate member 32 intermediate member 32a communication hole 33 support member 34 support member 35 support member

Claims (5)

[Scope of utility model registration request] 1. A pressure regulating valve in which a set pressure by a pressure regulating mechanism 4 having a compression spring means 30 is applied to one side of a diaphragm 17 which drives a valve rod 11, and a secondary pressure of the valve is applied to the other side, The pressure regulating valve, wherein the compression spring means 30 is configured so that its spring constant increases as the compression force increases. 2. The pressure adjusting mechanism 4 is provided with an adjusting knob 20, a spring pressing member 22 that is pressed by the rotation of the adjusting knob 20, and a diaphragm pressing member 23, and between the spring pressing member 22 and the diaphragm pressing member 23. 2. The pressure regulating valve according to claim 1, further comprising a compression spring means 30 formed by combining a plurality of compression springs 30a, 30b, 30c having different spring constants. 3. A plurality of compression springs 30a, 30b, 30c.
Are arranged in series via movable intermediate members 31 and 32, respectively. 4. A plurality of compression springs 30a, 30b, 30c.
Are configured by combining those having diameters proportional to their respective spring constants, and each compression spring has a small diameter via intermediate members 31 and 32 each of which is a movable bottomed cylinder having a flange at the opening edge. The compression springs are arranged in concentric circles in order from the largest to the largest, and the ends of the compression springs in contact with the intermediate members 31, 32 are in contact with the bottom surface of the bottomed tubular body, and the ends of other compression springs adjacent thereto are The pressure regulating valve according to claim 2, which is in contact with the collar. 5. A plurality of compression springs 30a, 30b, 30c.
Have different diameters, and the respective end positions of the compression springs on the side of the spring pressing member 22 are sequentially displaced in the axial direction, and are arranged concentrically in order from the smaller diameter to the larger diameter. 2 pressure regulating valve.