TWI836632B - Safety valve with damping function - Google Patents

Abstract

According to an embodiment of the present invention, a safety valve with a damping function may include: a main body, which has a valve disc connected to the main shaft inside, and when the fluid flows in through the valve seat and reaches a set pressure, the valve disc rises and the fluid flows out through an outlet; a compression part, which has a spring and a lower plate, and the spring is connected to the main shaft so as to surround the main shaft on one side of a flange arranged on the main body, and is compressed when the main shaft and the valve disc rise together, and the lower plate is installed on an end of the spring facing the flange; and a damping part, which is arranged on the flange, and the internal space is formed as a chamber space with air, and when the lower plate descends, the descending speed of the lower plate is reduced by the resistance of the air existing in the chamber space.

Description

Safety valve with damping function

The present invention relates to a safety valve with a damping function. More specifically, it relates to a safety valve that reduces the descending speed through the damping part when the lower plate of the compression part descends, thereby reducing the degree of impact of the valve disc on the valve seat, and This safety valve can prevent parts from being damaged, and has a structure in which the damping part and the compression plate can be installed on the existing main body, thereby minimizing costs.

A safety valve is a valve that opens when the pressure in a fuel tank or pipeline rises and reaches a preset pressure, discharging the steam or gas inside to the outside to prevent the fuel tank or pipeline from being damaged or exploding due to high pressure.

This kind of safety valve can be divided into direct-acting type, pilot type, spring-operated type, etc. according to its shape or purpose.

Among them, the spring-operated safety valve is mainly used in situations where a relatively high set pressure is required, and has a structure that uses a spring installed in the valve to achieve the set pressure.

Existing safety valves generally have a structure in which fluid flows into the valve seat through an inlet of a nozzle provided on the valve body. When the pressure of the fluid exceeds a set pressure, the valve disc is instantly lifted and the fluid is discharged from the discharge port.

When manufacturing this kind of safety valve, it is extremely important to prevent leakage by grinding the valve disc and valve seat. It is also extremely important to prevent damage to the parts where the valve disc and valve seat come into contact with repeated opening and closing operations. important.

However, in existing safety valves, when the valve disc is momentarily lifted from the valve seat and then restored to its original state, the valve disc and the valve seat may be subjected to a temporary impact, so damage may occur to the valve disc, the valve seat, or the bracket surrounding the valve disc.

Therefore, there is a need to develop a safety valve with a new structure, which can prevent damage to parts by reducing the impact of the valve disc on the valve seat when the valve disc rises or falls relative to the valve seat.

As related prior art, there are Korean Patent Publication No. 10-2010-0013392 (invention name: spring-operated safety valve) and the like.

The embodiment of the present invention provides a safety valve with a damping function. When the lower plate of the compression part descends, the descending speed is reduced by the damping part, thereby reducing the impact of the valve disc on the valve seat and preventing parts from being damaged. Moreover, by having a structure in which the damping part and the compression plate can be installed on the existing main body, the cost can be minimized.

The problems to be solved by the present invention are not limited to the problems mentioned above. For other problems not mentioned, those of ordinary skill in the art will clearly understand from the following description.

According to the embodiment of the present invention, the safety valve with damping function may include: a main body, which has a valve disc connected to the main shaft inside, when the fluid flows in through the valve seat and reaches the set pressure, the valve disc rises and the fluid flows out through the outlet; a compression part, which has a spring and a lower plate, the spring is connected to the main shaft so that the main shaft is provided at the flange of the main body. One side surrounds the main shaft and is compressed when the main shaft and the valve disc rise together. The lower plate is installed on one end of the spring facing the flange; and the damping part is arranged on the flange, and the internal space is formed as a chamber space with air. When the lower plate descends, the resistance of the air in the chamber space is used to reduce the descending speed of the lower plate.

Moreover, the inner wall of the main body part on one side of the flange according to the embodiment of the present invention may be formed with a stepped groove in the wall thickness direction, and the side part of the damping part may be fitted in the stepped groove.

Moreover, the lower plate according to the embodiment of the present invention may be formed with at least one air hole, so that when the lower plate is inserted into the chamber space of the damping part, the air in the chamber space flows out through the air hole, and at least a portion of the air hole toward the spring may be formed in a funnel shape, so that when the lower plate rises from the chamber space of the damping part, the air moves to the chamber space through the air hole.

Furthermore, a spiral groove may be formed in at least a part of the air hole according to an embodiment of the present invention for accelerating the moving speed of the air.

Moreover, the lower plate according to the embodiment of the present invention may include: a spring insertion portion inserted into one end of the spring; a circular plate portion formed as a whole with the spring insertion portion and inserted into the chamber space of the damping portion; and a plurality of air holes uniformly arranged at equal angles in the spring insertion portion and the plate portion.

Furthermore, the maximum outer diameter of the plate portion according to an embodiment of the present invention may be equal to or smaller than the maximum inner diameter of the side wall of the damping portion forming the chamber space.

Moreover, according to the embodiment of the present invention, the outer side of the lower end of the plate portion can be formed into an inclined surface that is processed by tilting, and the inner side of the upper end of the side wall of the damping portion can be formed into an inclined surface that is processed by tilting.

Moreover, the inclination angle of the inclined surface of the plate portion according to the embodiment of the present invention may be equal to or greater than the inclination angle of the inclined surface of the side wall of the damping portion.

Moreover, the flange according to the embodiment of the present invention may be formed with a negative pressure reducing groove, which is formed inward from the side where the lower plate is installed, and is used to reduce the negative pressure generated when the lower plate rises relative to the damping part.

Furthermore, the safety valve according to the embodiment of the present invention may further include a stopper in a stepped shape on the inner wall of the main body portion where the compression portion is disposed to limit the movement of the lower plate. rise to limit the shrinkage of the bellows mounted on the spindle at the lower part of the flange.

According to the embodiment of the present invention, when the lower plate of the compression part descends, the descending speed is reduced by the damping part, thereby reducing the impact of the valve disc on the valve seat and preventing parts from being damaged. Moreover, by having a structure in which the damping part and the compression plate can be installed on the existing main body, the cost can be minimized.

In addition, by having a structure that prevents the parts constituting the valve from being corroded by the fluid, the cost of replacement or maintenance can be reduced.

100, 200, 300: Safety valve

110, 310: Main body

111:Lower body

112: Entrance

113: Valve seat

114:Exit

115, 215: flange

117, 317: Upper body

118: Stairway

120: Valve plate

121: Valve disc bracket

130:Compression Department

131, 331: Spindle

133: Spring

134, 334: Bellows

135:On the board

136:Bearing

138: Adjustment screw

140, 240, 340: Lower plate

141: Spring insertion part

143: Plate part

143a: Inclined surface of plate part

145: Stoma

150, 250: Damping part

151: Side wall

151a: Inclined surface of the side wall

160:Compression ring

165: Leakage prevention part

215h: Negative pressure reduction tank

370: Stopper

FIG. 1 is a diagram showing the internal structure of a safety valve with a damping function according to an embodiment of the present invention.

Figure 2 is a partial enlarged view of Figure 1.

FIG3 is a diagram showing a state in which the lower plate of the compression part in FIG2 is lowered to the inside of the damping part.

FIG. 4 is a diagram illustrating air movement when the lower plate moves relative to the damping part using FIGS. 2 and 3 .

FIG5 is a diagram showing a safety valve according to another embodiment of the present invention having a hydraulic pressure reducing groove formed therein.

FIG. 6 is a diagram showing a safety valve equipped with a stopper according to another embodiment of the present invention.

Advantages and/or features of the present invention, as well as methods for achieving them, will become apparent with reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. These embodiments are only used to complete the disclosure of the present invention and provide general guidance to the field to which the present invention belongs. The invention is only defined by the scope of the claims to provide those skilled in the art with the full scope of the invention, and the same reference numerals refer to the same constituent elements throughout the specification.

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

Fig. 1 is a diagram showing the internal structure of a safety valve with a damping function according to an embodiment of the present invention. Fig. 2 is a partial enlarged view of Fig. 1 . Fig. 3 is a lower plate showing the compression part in Fig. 2 FIG. 4 is a diagram showing the state of descending into the inside of the damping part, using FIGS. 2 and 3 to explain air movement when the lower plate moves relative to the damping part.

As shown in these figures, the safety valve 100 with a damping function according to an embodiment of the present invention is, for example, installed in a fuel tank or a pipe. When the internal pressure rises above the set pressure, it is temporarily opened to discharge the fluid to The external valve may include: a main body 110 forming a basic frame; a compression part 130 disposed on the upper side of the flange 115 provided on the main body 110; and a damping part 150 disposed on the flange 115 and disposed on the compression part 130 The lower plate 140 interacts to reduce the descending speed of the lower plate 140 .

Through the above structure, inside the main body 110, when the valve disc 120 rises and falls relative to the valve seat 113, especially when the valve disc 120 descends, the descending speed of the valve disc 120 can be reduced to prevent the valve seat 113 or the valve disc 120 from being damaged.

Each structure will be described below. The main body 110 of this embodiment, as shown in Figure 1 , forms a basic appearance and may include: a lower body 111 formed with an inlet 112 for fluid to flow in; and an upper body 117 that can be lifted and lowered to be installed. a compression part 130; a flange part 115 for connecting the lower body 111 and the upper body 117; and an outlet 114 formed in the side direction of the lower body 111 for discharging the fluid flowing in through the inlet 112.

The lower body 111 is provided with a valve seat 113 connected to the inlet 112 and allowing the fluid flowing in from the inlet 112 to pass through. The upper part of the valve seat 113 is provided with a valve disc 120 for opening and closing the valve seat 113 in a manner that can be raised and lowered. The valve disc 120 is provided at the lower part of the compression part 130 described later and can move together with the compression part 130 to open or close the valve seat 113.

The valve disc 120 basically remains closed relative to the valve seat 113. When the internal pressure in the main body 110 becomes higher than the set pressure, the valve disc 120 opens relative to the valve seat 113. When the internal pressure is lower than the set pressure, the valve disc 120 drops and closes relative to the valve seat 113.

However, when the valve disc 120 descends, if the transient descending speed is fast, a large impact may be exerted on the valve disc 120, the valve seat 113, and the valve disc bracket 121 surrounding the valve disc 120, which may cause damage to these. . Therefore, if a structure is provided to reduce the lowering speed while ensuring the lowering of the valve disc 120, the problem of parts damage can be solved.

Therefore, the present embodiment has a damping part 150 that can reduce the descending speed of the valve disc 120. Before explaining the damping part 150, in order to explain the descending principle of the valve disc 120, the structure of the compression part 130 used to operate the valve disc 120 is explained.

The compression part 130 of this embodiment may include: a main shaft 131, one end of which is installed on the valve disc 120; a spring 133, which is connected to the main shaft 131 so as to surround the main shaft 131 in the upper body 117; and a lower plate 140, which is installed in the direction of the spring 133. The lower end of the flange 115; the upper plate 135, mounted on the upper end of the spring 133; and the bellows 134 surrounding the main shaft 131 within the lower body 111.

In addition, referring to FIG. 1 , an adjustment screw 138 is installed at the upper end of the upper body 117 , and the main shaft 131 is disposed penetratingly inside the adjustment screw 138 . Therefore, when the main shaft 131 moves up and down, it can be accurately maintained. Spindle 131 s position.

Referring to FIG. 1 , the adjusting screw 138 can move up and down around the main shaft 131. At its lower part, the spring 133 surrounds the main shaft 131. The upper plate 135 mounted on the upper end of the spring 133 and the adjusting screw 138 are connected through the bearing 136 structure, so that the main shaft 131 can be smoothly and accurately lifted and lowered relative to the adjusting screw 138.

As shown in Figures 1 and 2, the lower end of the main shaft 131 is surrounded by the bellows 134. When the main shaft 131 rises due to the compression of the spring 133, the bellows 134 is compressed. When the main shaft 131 returns to its original state, the bellows 134 also returns to its original state.

The compression part 130 can make the valve disc 120 rise and fall relative to the valve seat 113 according to the set pressure. As mentioned above, the compression part 130 interacts with the damping part 150, thereby reducing the descending speed of the valve disc 120. This prevents damage to parts.

As shown in FIG. 2 and FIG. 3 , the damping part 150 of this embodiment is arranged on the upper surface of the flange 115, and is generally formed into a cylindrical or annular shape with short upper and lower parts, and the internal space is formed into a chamber space 150S with air.

Therefore, when the lower plate 140 of the compression part 130 rises and then falls again, the lower plate 140 can be slowed down due to the resistance of the air in the chamber space 150S, thereby reducing the impact of the valve disc 120 on the valve seat 113.

As shown in FIG. 2 , the damping portion 150 can be coupled to the stepped groove 118 on the upper side of the flange 115 and under the upper body 117 of the main body 110 . The inner wall of the end is stepped. In other words, the stepped groove 118 corresponding to the side shape of the damping part 150 may be formed on the inner wall of the upper body 117, and the damping part 150 may be fitted into the stepped groove 118, so that the damping part 150 may maintain a stable position.

The upper body 117 may have the specifications of an existing safety valve, and the damping part 150 may be installed by forming the stepped groove 118 on the inner surface of the upper body 117, thereby reducing the cost or labor required for constructing the equipment.

In addition, referring to FIG. 4 , when a pressure higher than the set pressure is generated, the lower plate 140 rises from the damping part 150 , and when the set pressure is reduced, the lower plate 140 descends accordingly, and for this reason, the outer shape of the lower plate 140 and the shape of the chamber space 150S of the damping part 150 have corresponding shapes.

First, as shown in FIGS. 2 to 4 , the lower plate 140 of this embodiment may include: a spring insertion portion 141 inserted into the lower end of the spring 133; and a circular plate portion 143 formed as a whole with the spring insertion portion 141 and inserted into the chamber space 150S of the damping portion 150.

In addition, a plurality of air holes 145 are formed evenly at equal angles on the lower plate 140 to allow the air in the chamber space 150S to flow out to the outside, or conversely allow the air to re-enter the chamber space 150S.

Referring to FIG. 2 and FIG. 3 , the maximum outer diameter of the plate portion 143 may be equal to or smaller than the maximum inner diameter of the side wall 151 of the damping portion 150 forming the chamber space 150S, so that the lower plate 140 may smoothly descend or ascend toward the chamber space 150S.

Referring to FIG. 2 and FIG. 3 , when the lower plate 140 is inserted into the chamber space 150S, the air in the chamber space 150S moves through the plurality of air holes 145 formed in the lower plate 140. At this time, the air acts as a resistance to the lower plate 140. Therefore, when the lower plate 140 descends to the damping part 150, the air acts as a damper and flows out through the air holes 145, so that the lower plate 140 can be inserted into the chamber space 150S.

In addition, referring to FIG. 2 , when a pressure higher than the set pressure is generated, the lower plate 140 rises from the chamber space 150S. At this time, the air above the lower plate 140 moves into the chamber space 150S through the air holes 145 again, so that the chamber space 150S can maintain an air-filled state.

To this end, the air hole 145 may have a funnel shape as a whole as shown in FIG. 2 , and the air may move smoothly through the shape of the air hole 145 .

Although not shown, a spiral groove may be formed in at least a portion of the air hole 145, such as a funnel portion whose width gradually narrows downward, and the air movement speed may be increased by the spiral groove.

2 , the outer side of the lower end of the plate portion 143 may be formed as an inclined processed surface 143 a, and the inner side of the upper end of the side wall 151 of the damping portion 150 may be formed as an inclined processed inclined surface 151 a.

Here, the inclination angle ∠P of the inclined surface 143a of the plate portion 143 may be equal to or greater than the inclination angle ∠D of the inclined surface 151a of the side wall 151 of the damping portion 150. Therefore, when the lower plate 140 is lowered and inserted into the damping portion 150, it is easy to adjust the position of the lower plate 140 relative to the damping portion 150, thereby preventing the lower plate 140 from shaking relative to the damping portion 150.

In other words, even if the lower plate 140 is slightly tilted laterally relative to the damping portion 150 , in other words, even if the axial centers of the damping portion 150 and the lower plate 140 are not completely consistent, When the lower plate 140 is lowered relative to the damping part 150, the inclined surface 143a of the lower plate 140 slides downward relative to the inclined surface 151a of the damping part 150, so that the alignment of the lower plate 140 relative to the damping part 150 can be accurately performed ( align).

On the other hand, as shown in FIG. 2 , the safety valve 100 of this embodiment may include a leak-proof portion 165 provided between the flange 115 and the lower body 111 to prevent fluid leakage.

Referring to Figure 2, a compression ring 160 for maintaining pressure may be provided between the flange 115 and the lower body 111, and a leak-proof portion 165 may be provided between the bellows 134 and the flange 115 at its lower portion to prevent leakage. The portion 165 can prevent the fluid flowing in through the valve seat 113 from leaking to the flange 115 or the upper body 117 or to the outside.

In addition, when the compression part 130 of this embodiment is in operation, the bellows 134 contracts or expands, thereby preventing the fluid from flowing into the internal main shaft 131 through the bellows 134, thereby preventing the parts from being corroded.

As mentioned above, according to an embodiment of the present invention, when the lower plate 140 of the compression part 130 descends, the descending speed is reduced by the damping part 150, thereby reducing the degree of impact of the valve disc 120 relative to the valve seat 113, and Damage to parts can be prevented, and the cost can be minimized by providing a structure in which the damping portion 150 and the compression plate can be installed on the existing main body portion 110 .

In addition, by having a structure that prevents parts constituting the valve from being corroded by the fluid, the cost of replacement or maintenance can be reduced.

In addition, the safety valve according to other embodiments of the present invention will be described below, but the description of the structure actually corresponding to the safety valve of the above-mentioned embodiment will be omitted.

FIG5 is a diagram showing a safety valve equipped with a hydraulic pressure reducing groove according to another embodiment of the present invention.

As shown in the figure, the flange 215 of the safety valve 200 in this embodiment may form a negative pressure reducing groove 215h, which is recessed from above to the inside for reducing the pressure on the lower plate 240 relative to the damping part 250. The negative pressure that occurs when lifting. The negative pressure reducing groove 215h may be formed as a cylindrical groove as a whole.

For example, when the safety valve 200 of this embodiment is closed by lowering the lower plate 240 and there is no negative pressure reducing groove 215h, if there is no air inside the damping part 150, the safety valve 200 will be opened by the air pressure. Negative pressure will be generated.

However, when the negative pressure reducing tank 215h is provided in this embodiment, since the air is stored in the negative pressure reducing tank 215h, the generation of negative pressure can be reduced, so that the opening and closing operation of the safety valve 200 can be performed more smoothly.

In addition, the safety valve according to other embodiments of the present invention will be described below, but the description of the structure actually corresponding to the safety valve of the above-mentioned embodiment will be omitted.

FIG. 6 is a diagram showing a safety valve equipped with a stopper according to another embodiment of the present invention.

As shown in the figure, the safety valve 300 of this embodiment includes a stopper 370, which is stepped in the inner wall of the upper body 317 of the main body 310 to limit the rise of the lower plate 340 to limit the flange. The lower part of 315 is installed on the main shaft 331 to shrink the bellows 334 at the speed.

The stopper 370 can prevent the compression of the bellows 334 by limiting the rise of the lower plate 340, thereby preventing the bellows 334 from being deformed and damaged, and can also prevent fluid leakage, thereby preventing additional risks caused by damage or leakage of parts.

The specific embodiments according to the present invention have been described above, but various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the illustrated embodiments, but should be defined by the scope of the claims and their equivalents.

As mentioned above, although the present invention has been described through limited embodiments and drawings, the present invention is not limited to the above-mentioned embodiments, and those of ordinary skill in the art to which the present invention belongs can make various modifications and variations. Therefore, it should be understood that the spirit of the present invention should be understood only by the scope of the patent application, and modifications that are equivalent or equivalent thereto shall fall within the spirit of the present invention.

100: Safety valve

110: Main part

111:Lower body

112:Entrance

113: Valve seat

114:Export

115:Flange

117: Upper body

118: Stairway

120: Valve plate

121: Valve disc bracket

130: Compression section

131: Main axis

133:Spring

134: Bellows

135: Go up to the board

136:Bearing

138:Adjustment screw

140: Lower board

150: Damping part

160:Compression ring

165: Leakage prevention part

Claims (9)

A safety valve with a damping function is characterized in that it comprises: a main body, in which a valve disc connected to a main shaft is provided, when a fluid flows in through a valve seat and reaches a set pressure, the valve disc rises, and the fluid flows out through an outlet; a compression part, which comprises a spring and a lower plate, wherein the spring is connected to the main shaft so as to surround the main shaft at one side of a flange arranged on the main body and be compressed when the main shaft and the valve disc rise together, and the lower plate is mounted on the spring. an end portion facing the flange; a damping portion, which is arranged on the flange, and the internal space is formed as a chamber space with air. When the lower plate descends, the lowering speed of the lower plate is reduced by the resistance of the air in the chamber space; and a stopper, which is stepped on the inner wall of the main body portion where the compression portion is arranged, and limits the rise of the lower plate to limit the degree of contraction of the bellows installed on the main shaft at the lower part of the flange. The safety valve with a damping function according to claim 1, wherein a stepped groove in the wall thickness direction is formed on the inner wall of the main body on one side of the flange, and the The side portion of the damping portion is fitted in the stepped groove. The safety valve with damping function as claimed in claim 1 is characterized in that at least one air hole is formed in the lower plate, so that when the lower plate is inserted into the chamber space of the damping part, the air in the chamber space flows out through the air hole, and at least a part of the air hole facing the spring is formed into a funnel shape, so that when the lower plate rises from the chamber space of the damping part, the air moves to the chamber space through the air hole. The safety valve with damping function as described in claim 3 is characterized in that a spiral groove is formed in at least a portion of the air hole to speed up the movement of the air. The safety valve with damping function as described in claim 1 is characterized in that the lower plate includes: a spring insertion portion inserted into one end of the spring; a circular plate portion formed as a whole with the spring insertion portion and inserted into the chamber space of the damping portion; and a plurality of air holes uniformly arranged at equal angles in the spring insertion portion and the plate portion. The safety valve with damping function according to claim 5, wherein the maximum outer diameter of the plate portion is equal to or smaller than the maximum inner diameter of the side wall of the damping portion forming the chamber space. The safety valve with a damping function according to claim 6, wherein the outer side of the lower end of the plate portion is formed as an inclined surface, and the inner side of the upper end of the side wall of the damping portion is formed as an inclined surface. Inclined surface. The safety valve with damping function as described in claim 7 is characterized in that the inclination angle of the inclined surface of the plate portion is equal to or greater than the inclination angle of the inclined surface of the side wall of the damping portion. The safety valve with damping function according to claim 1, characterized in that a negative pressure reducing groove is formed on the flange, and the negative pressure reducing groove is formed inward from the side on which the lower plate is installed. To reduce the negative pressure generated when the lower plate rises relative to the damping portion.

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