KR102688525B1 - Regulator for processing fuel - Google Patents

Abstract

In order to improve safety of use by blocking leakage, the present invention includes a lower decompression part where the fuel gas flowing in through the inlet port is first depressurized; A main body coupled to the upper part of the lower pressure relief unit and having a seat portion in the center and forming a narrowed through passage; A poppet part that selectively seals the lower end of the seat part upward is integrally connected to the lower part, an upper through-flow passage is formed inside the upper part to communicate with the upper space of the seat part through a radiation passage, and an inner peripheral surface of the main body is formed on the outer circumference of the lower part. An upper piston portion formed with an extension step that slides and moves up and down in a sealed manner; An upper cover coupled to the upper part of the main body; Provided is a fuel supply regulator including an upper spring provided between the upper cover and the upper surface of the extension step to provide downward elastic support.

Description

Regulator for fuel supply {Regulator for processing fuel}

The present invention relates to a fuel supply regulator, and more specifically, to a fuel supply regulator that is compact and improves safety of use by blocking fuel gas leakage.

In general, fuel supply regulators maintain the pressure on the output side within a certain range regardless of pressure fluctuations on the input side, and are used in various industrial fields such as chemistry, oil refining, and gas. For example, in the case of fuel cell vehicles, high-pressure tanks are used to increase driving range, so a high-pressure regulator is essential to reduce fuel pressure.

In particular, one of the important design elements for regulators for aircraft is to achieve a compact/lightweight structure while maintaining operational reliability and durability during three-dimensional movement.

Related to this, the conventional high pressure regulator includes a configuration in which a pressure reduction chamber is formed between the inlet and the outlet and the piston is resiliently supported by a spring, etc., and is configured in this way to perform a pressure reduction action while ensuring durability.

However, in the past, the operation direction of the piston and the penetration direction of the inlet were set differently, or the operation for pressure reduction was doubled using a separate electrical control device. Due to the structure of the pressure reduction chamber, the operational reliability and durability of the regulator were limited. There was a limitation in that it was difficult to miniaturize and lightweight for use as an aircraft while maintaining the .

As a result, it was difficult to fundamentally block the occurrence of fine leaks or leaks in conventional regulators when the supply of hydrogen fuel was stopped, and there was a risk of safety accidents or waste of hydrogen fuel cells due to high pressure at the rear end of the regulator due to continuous leakage. There was a problem that made it difficult to block.

Korean Patent No. 10-2399185

In order to solve the above problems, the present invention aims to provide a fuel supply regulator that is compact and blocks leakage of fuel gas.

In order to solve the above problem, the present invention includes a lower decompression part where the fuel gas flowing in through the inlet port is first depressurized; A main body coupled to the upper part of the lower pressure relief unit and having a seat portion in the center and forming a narrowed through passage; A poppet part that selectively seals the lower end of the seat part upward is integrally connected to the lower part, an upper through-flow passage is formed inside the upper part to communicate with the upper space of the seat part through a radiation passage, and an inner peripheral surface of the main body is formed on the outer circumference of the lower part. An upper piston portion formed with an extension step that slides and moves up and down in a sealed manner; An upper cover coupled to the upper part of the main body; It includes an upper spring provided between the upper cover and the upper surface of the expansion step to provide downward elastic support, and is pressurized by leaked fuel gas between the lower surface of the expansion step and the main body to press the expansion step upward. A back pressure space is formed, and the area of the lower surface of the extension step exposed to the back pressure space is formed to be larger than the cross-sectional area of the upper through passage, and an adjustment means for adjusting the elastic recovery force of the upper spring is located on the inner periphery of the upper cover. The adjustment means is screw-fastened to the inner periphery of the upper cover so as to adjust the position of the upper end of the upper spring, and the first support screw is hollow so that the narrowed cylindrical upper part of the upper piston part penetrates. and a second support screw screwed to the inner circumference of the upper cover so as to contact the upper surface of the first support screw to perform a loosening prevention function, and provided in a hollow shape so that the upper piston portion penetrates, wherein the second support screw is screwed to the inner circumference of the upper cover to perform a loosening prevention function. A fuel supply regulator is provided, characterized in that the upper surface of the first support screw is double coupled to the lower surface of the screw so that the upper surface is in surface contact with each other.

Here, the lower pressure reducing unit includes a lower body having an inlet port formed on a side and a hollow formed in the axial direction and coupled to the lower part of the main body, an inlet bush coupled to the hollow and having a through hole formed in the central portion, and the through hole. A lower piston part including an extension part integrally formed on the upper part of the lifting rod part, a lifting rod part having a sealing part at the lower part to selectively seal the upper part and being lifted and lowered in a slide-sealed manner, and providing an upward elastic support force to the lower piston part. It is desirable to include a lower spring.

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At this time, a lower through-flow passage is formed in the central part of the lifting rod, and the entrance of the lower through-flow passage is formed laterally, and a pressure-reducing expansion pipe communicating with the lower through-passage but expanded is formed in the expanded portion, and the lifting rod is formed. It is preferable that the cross-sectional area of the section is smaller than the cross-sectional area of the pressure reduction expansion tube.

Through the above solutions, the present invention provides the following effects.

First, the fuel supply regulator according to the present invention has a compact structure in which the primary and secondary pressure reducing structures are provided in series along the axial direction and can provide an efficient and pressure reducing effect.

Second, when the supply of fuel gas is stopped, the more leakage occurs due to a fine leak at the contact portion of the poppet portion and the seat portion, the greater the force of the poppet portion to press the seat portion upward, so that the poppet portion and the seat portion Safety performance can be improved by blocking continuous leakage between devices.

Third, the first support screw is screwed to the inner periphery of the upper cover so that the position of the upper end of the upper spring can be adjusted, so that the elastic restoring force of the upper spring can be easily adjusted, and the first support screw is attached to the upper surface of the first support screw. The second support screw is coupled in surface contact to prevent loosening of the first support screw due to external vibration, thereby improving operational reliability.

1 is a cross-sectional view showing a fuel supply regulator according to an embodiment of the present invention.
Figure 2 is an enlarged cross-sectional view of the main part of the fuel supply regulator in an open state according to an embodiment of the present invention.
Figure 3 is an enlarged cross-sectional view of the main part of the fuel supply regulator in a closed state according to an embodiment of the present invention.
Figure 4 is an enlarged cross-sectional view of the main part showing the pressure distribution in the closed state of the fuel supply regulator according to an embodiment of the present invention.

Hereinafter, a fuel supply regulator according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

The present invention provides a compact and lightweight fuel supply regulator that blocks leakage of hydrogen fuel gas and is suitable for use in aircraft.

Figure 1 is a cross-sectional view showing a fuel supply regulator according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view of the main part of the fuel supply regulator according to an embodiment of the present invention in an open state, and Figure 3 is an enlarged cross-sectional view of the main part of the fuel supply regulator according to an embodiment of the present invention. This is an enlarged cross-sectional view of the main part of the fuel supply regulator in a closed state according to an embodiment of the present invention, and Figure 4 is an enlarged cross-sectional view of the main part showing the pressure distribution in the closed state of the fuel supply regulator according to an embodiment of the present invention.

As shown in Figures 1 to 4, the fuel supply regulator 100 according to the present invention includes a lower pressure reducing part 5, a main body 20, an upper piston part 40, an upper cover 50, and an upper Includes spring 45.

Here, the lower pressure reducing unit 5 is provided at the lower part of the fuel supply regulator 100 to primarily depressurize the fuel gas flowing in through the inlet port. In detail, the lower pressure reducing unit 5 includes a lower body 10, an inlet bush 11, a lower piston unit 30, and a lower spring 25.

Here, an inlet port is formed on the side of the lower body 10, and a hollow 10a communicating with the inlet port is formed in the axial direction and is coupled to the lower part of the main body 20. At this time, the inlet port is connected to a high-pressure tank for storing fuel gas such as hydrogen, and a device is opened between the inlet port and the high-pressure tank only in the direction in which fuel gas such as hydrogen flows out from the high-pressure tank to the regulator side. 1 It is desirable that a check valve (15) is provided.

Referring to Figures 2 and 3, the inlet bush 11 is coupled to the hollow 10a and a through hole 11a is formed in the central portion. In addition, the lower piston part 30 includes a lifting rod part 31 that is slide-sealed and has a sealing part 30a at its lower end to selectively seal the upper end of the through hole 11a, and the lifting rod part 31 ) includes an expansion portion 33 integrally formed at the top of the.

Here, the lower spring support portion 37 is provided with a penetrating portion 37a formed in the central portion that is aligned with the outer periphery of the lifting rod portion 31, and the lower spring 35 interpolated into the lower spring support portion 37 is provided as described above. It provides an elastic restoring force that presses the expansion portion 33 in an upward direction. Through this, the lower spring 35 provides an upward elastic restoring force to the lower piston unit 30. At this time, the slide-sealed lifting means that the lifting rod part 31 is in close contact with the O-ring 37b provided on the inner periphery of the penetrating part 37a during the selective lifting and lowering process, and the seal is maintained.

In addition, a lower through passage 31a is formed in the central portion of the lifting rod portion 31, and an inlet 31aa of the lower through passage 31a is formed laterally penetrating along the radial direction. In addition, a pressure-reducing expansion part 33a may be formed inside the expansion part 33 on the outlet side of the lower through passage 31a.

At this time, the cross-sectional area of the lifting rod part 31 is formed to be smaller than the cross-sectional area of the pressure-reducing expansion tube part 33a. In this way, since the cross-sectional area of the lifting rod part 31 is formed to be smaller than the cross-sectional area of the pressure reduction expansion tube 33a, the pressure in the lower space of the lifting rod part 31 and the inner space of the pressure reduction expansion tube 33a is If they are the same, a downward force may be applied to the lower piston portion 30 due to the difference in cross-sectional area. However, since the lower piston part 30 is provided with an upward elastic restoring force by the lower spring 35, the force balance is substantially equal on the upper and lower sides with respect to the sealing part 30a.

Of course, referring to FIG. 2, when the supply of the hydrogen fuel gas is interrupted, the elastic recovery force of the lower spring 35 is adjusted so that the sealing part 30a descends and seals the upper end of the through hole 11a. It is desirable to be

However, the hydrogen fuel gas flowing in through the first check valve 15 flows upward in a reduced pressure state by repeatedly opening and closing the sealing portion 30a that seals the upper end of the through hole 11a in the initial state.

After a certain period of time, as shown in FIG. 3, the upper end of the through hole 11a is slightly open due to the upward restoring force of the lower spring 35 applied to the lower piston part 30 and the pressure difference between the upper and lower parts. It can be maintained. Through this, the high pressure of fuel gas such as hydrogen can be primarily reduced and the fuel gas can be introduced to the upper side.

Meanwhile, the main body 20 is coupled to the upper part of the lower pressure reducing part 5, and a seat part 21 is provided at the center of the main body 20 to form a narrowed through passage.

In addition, a poppet part 41 is integrally connected to the lower end of the upper piston part 40 to selectively seal the lower inner circumference of the seat part 21 upward. In addition, an upper through passage (40a) is formed inside the upper part of the upper piston portion (40), which communicates with the upper space of the seat portion (21) through a radiation passage (40b).

In detail, the poppet portion 41 is integrated with the upper piston portion 40 by being inserted and fixed to the lower end of the upper through passage 40a and seals the lower end of the upper through passage 40a.

In addition, an extension step 42 is formed on the lower outer periphery of the upper piston part 40 and is slidably lifted along the upper inner peripheral surface of the main body 20. Here, the slide-closed lifting occurs in a process in which the sealing 25 provided on the inner circumference of the main body 20, which is rigidly coupled to the outer peripheral surface of the extension step 42, and the extension step 42 are selectively lifted and lowered. This means that they adhere closely to each other and remain airtight.

Here, a plurality of radiating passages (40b) penetrating radially and obliquely along the radial direction are formed inside the extension step (42) to communicate with the upper space of the seat portion (21) and the upper through passage (40a). You can.

And, the upper cover 50 is coupled to the upper part of the main body 20. A second check valve 85 connected to the fuel cell stack may be connected to the upper part of the upper cover 50.

Meanwhile, the upper spring 45 is provided between the upper cover 50 and the upper surface of the extension step 42 to provide downward elastic support. At this time, it is preferable that a sealing ring is provided between the outer peripheral surface of the extension step 42 and the inner surface of the main body 20. Therefore, it is desirable to prevent fuel gas from penetrating into the space where the upper spring 45 is provided while the upper piston unit 40 is raised and lowered.

In addition, a back pressure space 22 is formed between the lower surface of the extension step 42 and the upper part of the main body 20 to the seat portion 21 to pressurize the extension step 42 upward by being pressurized by fuel gas. do. Here, it is preferable that a stopping step 23 is formed on the outer edge of the back pressure space 22 to restrict the extension step 42 downward.

At this time, the area of the lower surface of the extended step 42 exposed to the back pressure space 22 is formed to be larger than the cross-sectional area of the upper through passage 40a. Here, the cross-sectional area of the upper through passage 40a can be understood as the cross-sectional area of the upper end of the upper piston portion 40.

In this way, since the cross-sectional area of the upper through passage 40a is formed to be smaller than the area of the lower surface of the extended step 42 exposed to the back pressure space 22, the upper through passage 40a and the extended step 42 ), if the pressure in the space on the lower side of the piston is the same, an upward force may be applied to the upper piston unit 40 due to the difference in cross-sectional area. That is, excluding the restoring force of the upper spring 45, if the upper and lower sides have the same pressure balance, an upward force is applied to the upper piston portion 40 so that the poppet portion 41 closes the seat portion 21. It can be.

At this time, since the upper piston part 40 is provided with a downward elastic restoring force by the upper spring, the force balance is substantially equal on the upper and lower sides with respect to the seat part 21. However, the pressure of the introduced hydrogen fuel gas flows upward in a reduced state by repeatedly pressing and opening and closing the poppet portion 41 that seals the lower end of the seat portion in the initial state. After a certain period of time, the seat part 21 will be maintained in a slightly open state as shown in FIG. 3 due to the downward elastic recovery force of the upper spring 45 applied to the upper piston part 40 and the pressure difference between the upper and lower parts. You can. Through this, the high pressure of fuel gas such as hydrogen can be secondaryly reduced and the fuel gas can flow into the upper side.

As such, the fuel supply regulator according to the present invention has a compact structure in which the primary and secondary pressure reducing structures are provided in series, and can provide an efficient pressure reducing effect.

Meanwhile, the structure in which continuous leakage due to leakage is stably prevented while the supply of fuel gas is stopped by the fuel supply regulator 100 according to the present invention is described as follows.

Referring to Figures 3 and 4, the poppet part 41 for selectively sealing the lower end of the seat part 21 is raised from the lower side to the upper side of the seat part 21 to seal it. At this time, the poppet part 41 is integrated and fixed to the lower end of the upper piston part 40, so when an upward force is applied to the upper piston part 40, the poppet part 41 is also raised.

Meanwhile, the pressure of the back pressure space 22 and the pressure of the upper through passage 40a may be substantially equal to each other. However, since the cross-sectional area of the upper through passage 40a is smaller than the area of the lower surface of the extended step 42 exposed to the back pressure space 22, the force generated by the pressure on the upper through passage 40a (P3) is formed to be smaller than the force (P2) generated by the pressure on the lower surface of the expansion step (42). In addition, the force (Ps) of the elastic restoring force applied downward by the upper spring 45 and the force (P1) due to the pressure applied upward to the lower end of the poppet portion 41 must be taken into consideration.

That is, the forces applied to the upper cylinder part 40 in the upward direction are P1 and P2, and the forces applied in the downward direction are P3 and Ps. Therefore, in order for the seat part 21 to be sealed by the poppet part 41 when the supply of fuel gas is stopped, the force of at least P1 + P2 must be greater than the force of P3 + Ps.

However, when the supply of fuel gas is stopped and the gas flow at the upper end of the fuel supply regulator is locked, leakage due to a fine leak occurs at the contact portion between the poppet portion 41 and the seat portion 21. , the pressure of the back pressure space 22 increases due to the pressure of the leaked fuel gas. As a result, the force P2 applied to the lower surface of the extension step 42 exposed to the back pressure space 22 may increase, thereby increasing the force raising the upper piston portion and the poppet portion.

Accordingly, when the supply of fuel gas is stopped, as leakage due to a fine leak occurs at the contact portion between the poppet portion 41 and the seat portion 21, the pressure in the back pressure space 22 increases. Accordingly, the force of the poppet portion 41 to press upward and seal the seat portion 21 becomes greater, so leakage can be blocked more reliably.

Through this, the safety performance of the device can be further improved by blocking continuous leakage of the poppet portion 41 and the seat portion 21 while the supply of fuel gas is stopped.

Meanwhile, it is preferable that an adjusting means 60 is provided on the inner periphery of the upper cover 50 to adjust the spring recovery force of the upper spring 45. The adjusting means 60 includes a first support screw 61 and Includes a second support screw (62).

In detail, the first support screw 62 is provided in a hollow shape so as to penetrate the narrowed cylindrical upper part of the upper piston part 40, and the upper is adjusted so that the position of restraining the upper end of the upper spring 40 is adjusted. It is screwed to the female thread formed on the inner periphery of the cover 50. Through this, the size of the elastic restoring force of the upper spring 45 can be easily adjusted by adjusting the fastening position of the first adjustment screw 61.

In addition, the second support screw 62 is provided in a hollow shape so that the upper piston portion 40 penetrates, and is formed on the inner periphery of the upper cover 50 in contact with the upper surface of the first support screw 61. It is screwed into the female thread. Through this, the upper surface of the first support screw 61 is double coupled to the lower surface of the second support screw 62 so that the first support screw 61 has a function of preventing loosening due to external vibration. This can improve operational reliability.

At this time, terms such as “include,” “comprise,” or “equipped” described above mean that the corresponding component may be present, unless specifically stated to the contrary, excluding other components. It should be interpreted as being able to include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

As explained above, the present invention is not limited to the above-described embodiments, and modifications and implementations can be made by those skilled in the art without departing from the scope of the claims of the present invention. And such modifications fall within the scope of the present invention.

5: lower pressure relief unit 10: lower body
11: Inlet bush 20: Main body
21: seat part 22: decompression space
30: lower piston part 30a: sealing part
35: lower spring 33a: pressure reduction expansion part
40: upper piston part 45: upper spring
40a: upper penetration passage 40b: radiation passage
50: Upper cover 17: Upper sealing groove
20: Adapter part

Claims (5)

a lower decompression section where the fuel gas flowing in through the inlet port is first depressurized;
A main body coupled to the upper part of the lower pressure relief unit and having a seat portion in the center and forming a narrowed through passage;
A poppet part that selectively seals the lower end of the seat part upward is integrally connected to the lower part, an upper through-flow passage is formed inside the upper part to communicate with the upper space of the seat part through a radiation passage, and an inner peripheral surface of the main body is formed on the outer circumference of the lower part. An upper piston portion formed with an extension step that slides and moves up and down in a sealed manner;
An upper cover coupled to the upper part of the main body;
It includes an upper spring provided between the upper cover and the upper surface of the extension step to provide downward elastic support,
A back pressure space is formed between the lower surface of the expansion step and the main body to pressurize the expansion step upward by being pressurized by leaked fuel gas, and the cross-sectional area of the expansion step exposed to the back pressure space is greater than that of the upper through passage. The lower surface area is formed larger,
An adjustment means is provided on the inner periphery of the upper cover to adjust the spring recovery force of the upper spring, and the adjustment means is
A first support screw screwed to the inner circumference of the upper cover to adjust the position of the upper end of the upper spring and provided in a hollow shape so that the narrowed cylindrical upper part of the upper piston part penetrates;
A second support screw is screwed to the inner circumference of the upper cover so as to contact the upper surface of the first support screw to perform a loosening prevention function and is hollow so that the upper piston part penetrates,
A fuel supply regulator, characterized in that the upper surface of the first support screw is double coupled to the lower surface of the second support screw so that the upper surface of the first support screw is in surface contact with each other. delete delete According to claim 1,
The lower pressure reducing unit
A lower body having an inlet port formed on the side and a hollow body formed in the axial direction and coupled to the lower part of the main body;
An inlet bush coupled to the hollow and having a through hole formed in the center,
A lower piston part including an elevating rod part with a lower end and a sealing part to selectively seal the upper end of the through hole and being lifted and lowered in a slide-sealed manner, and an expansion part formed integrally with the upper part of the elevating rod part;
A fuel supply regulator comprising a lower spring that provides upward elastic support to the lower piston portion. According to claim 4,
A lower through-flow passage is formed in the center of the lifting rod portion, and the inlet of the lower through-flow passage is formed laterally, and a pressure-reducing expansion pipe in communication with the lower through-passage but expanded is formed in the expanded portion,
A fuel supply regulator, characterized in that the cross-sectional area of the lifting rod portion is formed to be smaller than the cross-sectional area of the pressure reduction expansion pipe portion.