KR20240029807A - Check Valve used for Auxiliary Power Units - Google Patents

Abstract

The present invention is a chamber of the body formed of a metal material by integrally injection molding a fluorine silicon cap at the tip of a poppet that opens and closes the chamber, which is in close contact with the periphery of the chamber formed inside the body of the check valve. We provide a check valve used in auxiliary power devices that prevents fluid leakage by preventing direct contact between the chamber and the pocket and preventing wear and scratches due to contact between the chamber and the pocket.

Description

Check valve used for Auxiliary Power Units}

The present invention relates to a check valve used in an auxiliary power device. More specifically, the present invention is related to a check valve used in an auxiliary power device, and more specifically, a fluorine silicon cap is attached to the tip of a poppet that is in close contact with the periphery of a chamber formed inside the body of the check valve and opens and closes the chamber. It relates to a check valve used in an auxiliary power device that is integrally injection molded using the insert injection method to prevent direct contact between the chamber and pocket of the body part molded from a metal material.

Generally, an auxiliary power unit (APU) is a device designed to supply auxiliary power to an aircraft. Airborne Auxiliary Power Unit, abbreviated as Auxiliary Power Unit APU, refers to a small turbine engine mounted on the tail of an airplane. The main function of the APU is to provide power and gas sources, but small amounts of APU can also provide additional thrust to the aircraft. Specifically, before the airplane takes off from the ground, electricity is supplied through the APU to activate the main engine, so there is no need to activate the airplane by power or gas source vehicles on the ground. When on the ground, the APU also provides electrical power and compressed air to ensure lighting and air conditioning within the cabin and cockpit. The APU can be used as a backup power source when the airplane takes off. After the plane lands, power is still supplied through the APU to ensure lighting and air conditioning.

Additionally, the function of the APU is to provide power and air source, and some APUs may provide additional propulsion power to the aircraft. Specifically, before the aircraft takes off from the ground, the main engine can be operated through the power supply of the APU, allowing the aircraft to operate without relying on ground power and air source vehicles. Additionally, at ground level, the APU also provides electrical power and compressed air to ensure lighting and air conditioning within the aircraft cabin and cockpit. When an aircraft takes off, the APU can be used as a backup power source. After the aircraft lands, power is still supplied by the APU to ensure lighting and air conditioning. The function of the APU determines its operational stability, which also directly affects the aircraft's flight cost and service quality. Therefore, the function of the APU determines the stability of its operation and is related to the flight cost and service quality of the airplane. And if the ground power and gas source are not guaranteed and the APU breaks down, the airplane cannot be operated.

Meanwhile, vehicles, especially special vehicles such as military or transportation, are equipped with the aforementioned auxiliary power unit (APU) along with the main power unit driven by the engine.

That is, special vehicles are equipped with a main power unit and an auxiliary power unit, and a preheating device for preheating during low-temperature starting is connected to the main power unit.

The APU, which is an auxiliary power unit used in military vehicles, tanks, armored vehicles, self-propelled guns, etc., serves to supply power to auxiliary electrical devices when the main power unit does not operate because the engine is turned off.

The APU includes a power unit, a load unit, and an additional device unit. Among them, the power part mainly consists of a power compressor, turbine unit, and exhaust unit, the load part mainly consists of a load compressor, and the auxiliary equipment mainly consists of an additional gear box, starter, and generator.

Meanwhile, the APU is equipped with a valve that supplies fluid (fuel), and this valve frequently leaks oil after a certain period of time, requiring periodic replacement. If replacement is delayed, not only does energy efficiency decrease due to leakage during APU operation, but there is also a risk of explosion of the leaked fluid.

Document 1: Republic of Korea Intellectual Property Office Published Patent Publication No. 10-2004-0078156 Document 2: Republic of Korea Intellectual Property Office Published Patent Publication No. 10-2013-0086458 Document 3: Republic of Korea Intellectual Property Office Published Patent Publication No. 10-2020-0094666

Therefore, the purpose of the present invention to solve the above-mentioned problems is to adhere and break the peripheral area of the chamber formed inside the body of the check valve and insert a fluorine silicon cap at the tip of the poppet that opens and closes the chamber by insert injection method. The purpose of this product is to provide a check valve used in an auxiliary power device that is integrated and injection molded to prevent direct contact between the chamber and pocket of the body made of metal.

The present invention for achieving the above-mentioned purposes is a check valve installed in an auxiliary power device that is installed in a supply line that supplies fluid to the auxiliary power device and prevents backflow of fluid. It is fastened to the supply line and the rear side is opened. A body part configured, a first chamber formed inside the body part, a second chamber formed behind the first chamber of the body part and connected to the first chamber, a step formed between the first and second chambers, At least one inlet flow path is formed through the outer surface of the body, connects the first chamber and the supply line, and allows fluid supplied through the supply line to flow into the first chamber, and is in close contact with the inner surface of the second chamber of the body. A main body part that moves before and after the furnace and has a main body discharge passage formed therein, and is formed on one side of the main body part to have a diameter smaller than the diameter of the main body part, forming a separation space on the inner surface of the second chamber, and inside the main body part, the main body part discharge passage is formed. A poppet composed of a reduced portion formed with a reduced portion discharge passage connected to and communicating with the main body discharge passage, a spring installed in the second chamber and applying a tension force to the poppet to press the front of the reduced portion to the step of the body portion, the body It has a plug that is screwed to the open rear part of the part and compresses the spring to exert a tension force of the spring, a protrusion protruding from the front center of the reduced part of the poppet, and a fastening groove fitted into the protrusion, and has a triangular pyramid shape. It is molded in a shape whose diameter gradually widens from the front to the back, and is characterized by including a fluorine silicon cap that elastically adheres to the periphery of the step and prevents wear of the poppet or the step.

In the process of molding the poppet, the fluorine silicon cap is preferably molded integrally with the outer surface of the protrusion protruding from the front of the reduced portion of the poppet using an insert injection method.

The present invention is a chamber of the body formed of a metal material by integrally injection molding a fluorine silicon cap at the tip of a poppet that opens and closes the chamber, which is in close contact with the periphery of the chamber formed inside the body of the check valve. By preventing direct contact between the chamber and the pocket, it has the effect of preventing fluid leakage by preventing wear and scratches caused by contact between the chamber and the pocket.

1 is a three-dimensional view showing the configuration of a check valve installed in an auxiliary power device according to the present invention.
Figure 2 is a combined cross-sectional view showing an excerpt of the check valve shown in Figure 1.
Figure 3 is an exploded cross-sectional view of Figure 2.
Figure 4 is a view showing an excerpt of the fluorine silicon cap of Figure 2.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In the detailed description to be described later, representative embodiments of the present invention will be presented to achieve the above-described technical problem. And other embodiments that can be presented with the present invention are replaced with descriptions in the configuration of the present invention.

The attached Figure 1 is a three-dimensional drawing showing the configuration of a check valve installed in the auxiliary power device according to the present invention, Figure 2 is a combined cross-sectional view showing an excerpt of the check valve shown in Figure 1, and Figure 3 is a combined cross-sectional view. FIG. 2 is an exploded cross-sectional view, and FIG. 4 is a view showing an excerpt of the fluorine silicon cap of FIG. 2.

As shown in Figures 1 to 4, the auxiliary power unit (hereinafter referred to as APU) 200 is used in military vehicles, tanks, armored vehicles, self-propelled guns, etc., and is used in cases where the main power unit does not operate because the engine is turned off. It refers to a small turbine engine that plays the role of supplying power to devices.

When the main power unit fails, the APU 200 receives fluid (fuel), converts the fluid into energy, and supplies electrical energy to auxiliary electric devices such as military vehicles, tanks, armored vehicles, and self-propelled guns.

Meanwhile, the check valve 100 proposed in the present invention is installed in the supply line 210 of the APU 200.

The check valve 100 maintains the closed state when fluid is not supplied to one side of the supply line 210, and opens at the pressure when fluid is supplied to one side of the supply line 210. ), the fluid supplied from one side is discharged to the other side of the supply line 210, and the discharged fluid is supplied to the APU (200).

The check valve 100 includes a head portion 10, a body portion 20, a poppet 30, a spring 50, a plug 60, and a fluorine silicon cap 70.

The head portion 10 allows the body portion 20 to be installed at the fastening portion of the supply line 210 where the check valve 100 is installed.

The body portion 20 is integrally provided at the rear of the head portion 10 and has a cylindrical shape with a first chamber 22 and a second chamber 24 formed therein. The first chamber 22 is formed inside the body portion 20, and the second chamber 24 is located behind the first chamber 22 and connected to the first chamber 22. (i.e., the outlet of the first chamber and the inlet of the second chamber 24 are connected to each other), and the size of the second chamber 24 is larger than that of the first chamber 22. It is preferable to form it large so that a step 26 is formed at the point where the first chamber 22 and the second chamber 24 meet.

Additionally, at least one inlet flow path 28 is formed penetrating the outer surface of the body portion 20. The inlet flow path 28 connects the supply line 210 and the first chamber 22 of the body portion 20, and allows fluid flowing into the supply line 210 to the first chamber 22. Let it flow in.

At least one O-ring 29 is installed on the outer diameter of the body portion 20. The O-ring 29 maintains airtightness between the body portion 20 and the fastening portion of the supply line 210.

The poppet 30 is inserted into the second chamber 24 of the body 20 to be able to move forward and backward, moves forward by the tension force of the spring 50, and moves forward and moves in the first chamber 24 of the body 20. It is caught on the step 26 formed between the chamber 22 and the second chamber 24 and blocks the outlet of the first chamber 22 to connect the first chamber 22 and the second chamber 24. and disconnection. The poppet 30, which has this operation, blocks the outlet of the first chamber 22 with the pressure of the spring 50 to prevent fluid (fuel) from flowing back in the check valve.

The poppet 30 is composed of a main body 32 having the shape of a cylindrical pipe, and a reduced part 34 formed on one side of the main body 32 to have a diameter smaller than the diameter of the main body 32. .

The main body 32 moves forward and backward under the pressure of the spring 50 while being in close contact with the inner surface of the second chamber 24.

The front 44 of the reduced portion 34 is closed, and the rear of the main body 32 is open.

In addition, first and second discharge passages 36 and 38 are formed inside the reduced portion 34 and the main body portion 32 and are connected to each other, and the main body portion discharge passage 38 includes the main body portion 32. ) One end of the spring 50 is inserted through the open rear.

The front surface 44 of the reduced portion 34 is in close contact with the step 26 formed between the first chamber 22 and the second chamber 24 of the body portion 20. A protrusion 46 is formed protruding at the center of the front surface 44 of the reduced portion 34, and a fluorine silicon cap 70, which is an airtight packing means, is coupled to the protrusion 46. A detailed description of the fluorine silicon cap 70 is described again below.

The main body portion 32 constituting the poppet 30 moves forward and backward while being in close contact with the inner surface of the second chamber 24 of the body portion 20, and the reduced portion 34 of the poppet 30 Since it has a smaller diameter than the main body portion 32, a predetermined space 40 is created between the second chamber 24 of the body portion 20 and the reduced portion 34. As a result, the separation space 40 provides a space where the fluid flowing into the first chamber 22 can be temporarily stored.

At least one connection passage 42 is formed on the circumferential surface of the reduced portion 34 of the poppet 30. The connecting passage 42 connects the separation space 40 between the second chamber 24 and the reduced portion 34 and the reduced portion discharge passage 38 formed inside the reduced portion 34 to maintain the spaced space. The fluid filled in the space 40 flows into the reduced portion discharge passage 38. The fluid flowing into the reduced portion discharge passage 38 is discharged to the main body discharge passage 36 of the main body portion 32, and then passes through the discharge hole 62 formed in the plug 60 to the supply line 210. ) is discharged.

The spring 50 is accommodated in the second chamber 24 of the body portion 20, and one end is inserted into the main body discharge passage 36 of the poppet 30, and the other end is inserted into the body portion 20. It is in close contact with the plug 60 that is screwed to the open rear of the plug, and is compressed according to the screw-type fastening operation of the plug 60 and exerts a tension force to elastically push the poppet 30.

The plug 60 is screwed into the open rear part of the body 20 and closes the second chamber 24 of the body 20 and connects the other side of the spring 50. is pressed so that the spring 50 can exert tension.

At least one discharge hole 62 is formed in the plug 60, and the discharge hole 62 discharges the fluid discharged into the second chamber 24 to the supply line 210.

Meanwhile, the fluorine silicon cap 70 is a means provided for the purpose of maintaining airtightness between the poppet 30 and the first chamber 22 of the body portion 20.

The fluorosilicone cap 70 is preferably molded in a triangular pyramid shape so that the diameter gradually widens from the front 70a to the back 70b, which means that the fluorosilicone cap 70 is a part of the first chamber 22. The adhesion of the fluorosilicone cap 70 can be increased by allowing it to come into close contact with the periphery of the step 26 in the inserted state.

A fastening groove 72 is recessed inside the fluorosilicone cap 70, and the fluorosilicone cap 70 with the fastening groove 72 protrudes in front of the reduced portion 34 of the poppet 30 described above. It is inserted into the formed protrusion 46 and the fluorine silicon cap 70 is coupled to the front of the reduced portion 34 of the poppet 30.

Before the front of the reduced portion 34 of the poppet 30 is brought into close contact with the step 26 between the first and second chambers 22 and 24 by the tension force of the spring 50, the fluorosilicone cap 70 It adheres closely to the periphery of the step 26 and blocks direct contact between the front 44 of the reduced portion 34 of the poppet 30 and the step 26, thereby blocking the step 26 and the reduced portion of the poppet 30 ( 34) Prevent wear due to friction between the front surfaces (44) and prevent fluid leakage during use. That is, since the body portion 20 and the poppet 30 are molded from a metal material, if the contact between the poppet 30 and the step 26 continues for a long period of time, oil leakage may occur due to damage such as wear and scratches. Therefore, the fluorine silicon cap 70 blocks direct contact between the poppet 30 and the step 26 to prevent oil leakage.

The fluorosilicone cap 70 may be fixed to the front of the reduced portion 34 of the poppet 30 in various ways, but in the present invention, it is inserted into the front of the poppet 30 during the process of molding the poppet 30. It is desirable to mold it integrally using an injection method. Through this insert injection method, the fluorosilicone cap 70 can be firmly fixed without being separated from the poppet 30 during use.

Hereinafter, the operation of the check valve having the above configuration will be described with reference to FIGS. 1 to 4.

First, the body part 20 of the check valve 100 is connected to the APU 200 and the fluid supply line 210 using the head part 10 of the check valve 100.

The check valve 100 fastened to the supply line 210 closes the supply line 210 until the fluid is supplied. When the fluid is supplied, the check valve 100 opens at the pressure at this time and allows the fluid to flow into the supply line 120. ensure that it can be supplied.

That is, the fluid supplied through the supply line 210 flows into the first chamber 22 of the body 20 through the inflow passage 28 of the body 20.

Subsequently, when a certain amount of fluid flows into the first chamber 22, the pressure of the fluid becomes higher than the tension force of the spring 50, and accordingly the poppet 30, which is elastically supported by the spring 50, is pushed rearward. do.

That is, when the poppet 30 is pushed rearward, the fluorosilicone cap 70 inserted into the front of the reduced portion 34 of the poppet 30 is inserted into the first and second chambers 22 of the body portion 20. 24) falls while in close contact with the periphery of the step 26 provided between them, and the fluid flowing into the first chamber 22 through this flows between the second chamber 24 and the reduced portion 34 of the poppet 30. It is discharged into the separation space 40 formed in .

The fluid discharged into the space 40 flows into the internal reduced portion discharge passage 38 of the reduced portion 34 through the connection passage 42 formed on the outer diameter of the reduced portion 34 of the poppet 30. Then, it passes through the main body discharge passage 36 connected to the reduced portion discharge passage 38 and is discharged into the second chamber 24 of the body portion 20, and then into the second chamber 24. ) is discharged into the supply line 210 through the discharge passage 62 of the plug 60, thereby opening the closed supply line 210 and releasing the fluid through the supply line 210 into the APU (200). can be supplied to users.

20: body part 22: first chamber
24: second chamber 26: step
28: Inlet flow path 30: Poppet
32: main body 34: reduced part
36: Main body discharge path 38: Reduced portion discharge path
40: Separation space 42: Connection passage
44: Front 46: Protrusion
50: spring 60: plug
70: Fluorine silicon cap 72: Fastening groove
100: check valve 200: APU
210: supply line

Claims (2)

In the check valve installed in the auxiliary power device to prevent backflow of fluid by being installed in the supply line 210 that supplies fluid to the auxiliary power device 200,
A body portion 20 connected to the supply line 210 and having an open rear portion;
A first chamber 22 formed inside the body portion 20;
a second chamber 24 formed behind the first chamber 22 of the body 20 and connected to the first chamber 22;
A step 26 formed between the first and second chambers 22 and 24;
At least one penetrating shape is formed on the outer surface of the body portion 20, connects the first chamber 22 and the supply line 210, and directs the fluid supplied through the supply line 120 to the first chamber 22. An inlet flow path (28) that flows into;
a main body portion 32 that moves forward and backward in close contact with the inner surface of the second chamber 24 of the body portion 20 and has a main body discharge passage 36 formed therein;
It is formed on one side of the main body 32 to have a diameter smaller than that of the main body 32, forming a space 40 on the inner surface of the second chamber 24, inside which the main body discharges. A poppet (30) composed of a reduced portion (34) formed with a reduced portion discharge passage (38) connected to and communicating with the flow path (36);
a spring 50 installed in the second chamber and applying a tension force to the poppet 30 to press the front surface 44 of the reduced portion 34 to the step 26 of the body portion 20;
A plug (60) screwed to the open rear of the body portion (20) and compressing the spring (50) to exert a tension force of the spring (50);
a protrusion 46 protruding from the center of the front surface 44 of the reduced portion 34 of the poppet 30;
It has a fastening groove 72 that is fitted into the protrusion 46, and is formed into a triangular pyramid shape with a diameter that gradually widens from the front side 70a to the back side 70b, so that it elastically adheres to the periphery of the step 26. A check valve used in an auxiliary power device, comprising a fluorine silicon cap (70) that prevents wear of the poppet (30) or the step (26).
According to clause 1,
In the process of molding the poppet 30, the fluorine silicon cap 70 is integrally molded by insert injection on the outer surface of the protrusion 46 protruding from the front of the reduced portion 34 of the poppet 30. A check valve used in an auxiliary power device characterized by: