A one-way valve assembly and a forced-blow-off one-way valve

Abstract

The present invention relates to a one-way valve assembly and a forced-purge one-way valve, which belong to the technical field of aerospace liquid oxygen-kerosene engines and involve a high-pressure gas valve used in the purge system of a cryogenic liquid rocket engine. Specifically, the present invention relates to a one-way valve assembly and a forced-purge one-way valve, comprising a stepped one-way valve body and a one-way valve core. A stepped through hole is provided at the center of the one-way valve body, and the one-way valve core is disposed in the stepped through hole. An external thread is provided on the outer peripheral surface of one end of the one-way valve body, which is the inlet end. The other end of the one-way valve body is the outlet end, and an internal thread matching the external thread is provided on the stepped hole on the outlet end. The internal thread at the outlet end of the present invention matches the external thread at the inlet end, and the one-way valve assembly can be connected in series, in parallel, or in series and parallel to form a single product or component to meet different operating requirements. The present invention greatly reduces the number of product-specific parts, simplifies the production process, and makes it possible to reduce the production and processing costs of commercial aerospace valve products.

Description

Technical Field

[0001] The present invention belongs to the technical field of aerospace liquid oxygen-kerosene engines, and relates to a high-pressure gas valve used in a blow-off system of a cryogenic liquid rocket engine, in particular to a one-way valve assembly and a forced blow-off one-way valve. Background Art

[0002] Liquid rocket engines typically consist of a propellant supply system, starting and ignition system, purge system, pressurization system, vacuum system, precooling system, and regulation system. High-pressure, staged-fired liquid oxygen-kerosene engines utilize an oxygen-enriched gas generator cycle, effectively addressing the carbon deposition and combustion instability issues inherent in the gas generator cycle. Therefore, their purge systems require various valve structures to purge the engine's internal cavity. Their primary functions include: 1) preventing water vapor from entering the engine's internal cavity during precooling, which can cause ice formation and valve or turbopump shaft jamming, nozzle blockage, and other faults; 2) preventing crosstalk between liquid oxygen and kerosene in the turbopump; 3) reducing the engine's shutdown aftereffect; and 4) facilitating post-test processing of the engine.

[0003] A check valve is a crucial component in the purge system of a liquid rocket engine. Its function during system purges is to prevent downstream high-pressure media from entering the system, potentially impacting the proper functioning of the system and downstream components, and potentially causing loss of functionality of the system or engine. It also fulfills the other on-off requirements of the purge system. Because the purge system requires purges at multiple locations, including the thrust chamber, generator, and turbopump, the purge pressures vary, and each purge path requires a separate check valve.

[0004] In the above-mentioned purge one-way valve of the liquid oxygen-kerosene engine, there is an enhanced purge one-way valve in the purge pipeline of the generator kerosene chamber. The valve is connected to both the purge nitrogen bottle and the purge helium bottle. When the engine is started, nitrogen is used for purge and helium is turned off; when the pressure of the purge outlet cavity is greater than the purge nitrogen inlet pressure, the purge is stopped; when the engine is shut down, after the pressure of the purge outlet cavity drops to a certain value, nitrogen and helium are used to purge the generator kerosene chamber at the same time; therefore, the valve can realize that only nitrogen is used for purge when the engine is started, and the remaining gas in the helium bottle is used to forcibly purge the generator kerosene chamber when the engine is shut down. In the purge system of the prior art, when the rocket reaches the predetermined orbit and the engine is shut down, the remaining gas in the gas cylinder is often seriously surplus. The excess gas stored in the gas cylinder is equivalent to the loss of part of the rocket's payload, thus making full use of the gas carried by the engine.

[0005] The valve not only has to meet the technical difficulties of the above-mentioned functional requirements, but also has to meet technical difficulties such as high-pressure redundant sealing requirements. Once the seal fails, it will greatly affect the normal operation of the engine. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem that the existing technology has problems in the structural implementation of the enhanced blow-off one-way valve of the kerosene chamber of the liquid oxygen-kerosene engine generator, and to solve the problem that small liquid rocket engines or reusable low-temperature small liquid rocket engines working under existing conditions cannot meet the requirements of small volume and weight, low cost and working reliability.

[0007] In order to solve the above technical problems, the present invention provides a one-way valve assembly and a forced-blowing one-way valve.

[0008] The present invention provides a one-way valve assembly, comprising a stepped one-way valve body and a one-way valve core. A stepped through hole is provided at the center of the one-way valve body, the one-way valve core is disposed in the stepped through hole, an external thread is provided on the outer peripheral surface of one end of the one-way valve body, the end being the inlet end, and the other end of the one-way valve body being the outlet end, the stepped hole on the outlet end being provided with an internal thread matching the external thread;

[0009] A valve core guide seat is further provided in the stepped through hole, and the valve core guide seat is provided in one end of the stepped through hole close to the outlet end and is connected to the internal thread of the stepped through hole, and a side of the valve core guide seat facing the inlet end is sealedly connected to the step of the stepped through hole close to the outlet end;

[0010] The valve core guide seat is provided with a medium flow hole for medium circulation;

[0011] The one-way valve core includes a valve core head and a valve stem, the valve stem is fixedly connected to the valve core head, and the central axis of the valve stem is located on the same straight line as the central axis of the valve core head. The side of the valve core head facing the inlet end is sealed with the step of the stepped through hole near the inlet end. The end of the valve stem away from the valve core head extends toward the valve core guide seat and passes through the valve core guide seat.

[0012] The valve core head is connected to the valve core guide seat through a one-way valve spring.

[0013] Preferably, a surface of the valve core guide seat facing the inlet end and a step of the stepped through hole close to the outlet end form a conical sealing pair.

[0014] Preferably, a surface of the valve core head facing the inlet end and a step of the stepped through hole close to the inlet end form a conical sealing pair.

[0015] Preferably, an annular cylindrical guide cylinder is fixedly provided on one end of the valve core guide seat facing the valve core head, and the end of the valve stem away from the valve core head extends into the guide cylinder and extends from the valve core guide seat;

[0016] A spring fixing groove is provided on one end of the valve core head facing the valve core guide seat, one end of the one-way valve spring is provided in the spring fixing groove, and the other end is sleeved outside the guide cylinder and abuts against the valve core guide seat.

[0017] Preferably, the one-way valve spring is a cylindrical compression spring.

[0018] A forced-blow-off one-way valve comprises a valve body, wherein a one-way valve assembly is arranged in the valve body, wherein three one-way valve assemblies are provided, namely a first one-way valve assembly, a second one-way valve assembly and a third one-way valve assembly;

[0019] The valve body is provided with a stepped central through hole, the external thread on the inlet end of the first one-way valve assembly is matched and connected with the internal thread on the outlet end of the second one-way valve assembly, and the first one-way valve assembly and the second one-way valve assembly are both sealedly connected to the central through hole;

[0020] A fourth one-way valve core assembly is further connected to one end of the second one-way valve assembly away from the first one-way valve assembly. A central blind hole communicating with the inlet end of the second one-way valve assembly is provided at the center of the fourth one-way valve core assembly, and a connecting hole communicating with the central blind hole is provided on the circumference of the fourth one-way valve core.

[0021] One end of the fourth one-way valve core away from the second one-way valve assembly is sealed with a valve cover, and the valve cover is sealed and arranged at the end of the central through hole and is sealed and connected to the valve body;

[0022] The fourth one-way valve core is connected to the valve cover via a fourth one-way valve core spring. The fourth one-way valve core spring is sleeved on one end of the fourth one-way valve core, and one end of the fourth one-way valve core spring is fixedly connected to the valve cover, and the other end thereof abuts against a step on the fourth one-way valve core.

[0023] A first air inlet connector is provided on the valve body at a position corresponding to the fourth one-way valve core. When the first one-way valve assembly and the second one-way valve assembly push the fourth one-way valve core to reciprocate, the communicating hole connects the first air inlet connector and the central blind hole, or the communicating hole closes the first air inlet connector and the central blind hole.

[0024] A second air inlet connector is provided on the valve body at a position corresponding to the second one-way valve assembly, and a radial flow hole is provided on the one-way valve body of the second one-way valve assembly. The radial flow hole is provided on the one-way valve body between the valve core guide seat and the sealing connection between the valve core head and the stepped through hole;

[0025] The second air inlet connector is connected to the radial flow hole through a third one-way valve assembly.

[0026] Preferably, a dustproof and waterproof device is provided on the side of the valve cover away from the second one-way valve assembly, and the end of the fourth one-way valve core away from the second one-way valve assembly is sealed to the valve cover through a radial non-metallic dynamic sealing ring, and extends into the dustproof and waterproof device after passing through the valve cover.

[0027] Preferably, the dustproof and waterproof device includes a screw plug, which is fixed and sealed to the valve cover through a sealing ring column. The screw plug is threadedly connected to the sealing ring column. An air flow hole is provided at the center of the screw plug, and a filter is provided on the air flow hole to prevent water vapor or dust in the air from entering.

[0028] Preferably, the first one-way valve assembly and the second one-way valve assembly are connected to the fourth one-way valve core at connections thereof and are sealed to the valve body via radial non-metallic dynamic sealing rings;

[0029] The third one-way valve assembly and the second one-way valve assembly are respectively sealed and connected to the valve body through static sealing rings.

[0030] Preferably, metal sealing gaskets are provided between the valve body and the valve cover, and between the second air inlet connector and the third one-way valve assembly.

[0031] The internal thread at the outlet end of the present invention matches the external thread at the inlet end, and two, three or more one-way valve assemblies can be connected in series, in parallel or in series and parallel to form a product or component to meet different working conditions.

[0032] The one-way valve assembly of the present invention has exactly the same structure. Except for the spring, its working principle and structural dimensions are the same. The spring parameters are set according to needs, thereby greatly reducing the types of product-specific parts and simplifying the production process, which makes it possible to reduce the production and processing costs of commercial aerospace valve products.

[0033] The present invention discloses a forced purge one-way valve, which adopts a four-way valve structure and can realize closing helium purge when the engine is started and using nitrogen purge. When the nitrogen purge is completed, the generator kerosene chamber can be purged with helium. Therefore, the present invention can realize using only nitrogen purge when the engine is started, and using the remaining gas in the helium cylinder to forcibly purge the generator kerosene chamber when the engine is shut down. In the purge system of the existing liquid oxygen-kerosene engine technology, when the rocket reaches the predetermined orbit and the engine is shut down, the remaining gas volume in the cylinder is often seriously surplus. The excess gas stored in the cylinder is equivalent to the loss of part of the rocket's payload. In this way, the gas carried by the engine is fully utilized. At the same time, after the engine is shut down, the inert gas helium is finally used to purge the liquid oxygen-kerosene engine generator kerosene chamber, which can partially solve the current problem of engine kerosene coking.

[0034] The present invention adopts a multi-check valve structure to achieve a redundant sealing function.

[0035] The first one-way valve assembly, the second one-way valve assembly and the third one-way valve assembly in the present invention have exactly the same structure. Except for the spring, their working principles and structural dimensions are the same, which greatly reduces the types of product-specific parts and simplifies the production process, making it possible to reduce the production and processing costs of commercial aerospace valve products.

[0036] The product of the present invention designs the seals at the connection between the valve body and the first one-way valve assembly, the second one-way valve assembly and the fourth valve core assembly, and the fourth one-way valve core and the valve cover as radial non-metallic dynamic seals, so that the sliding friction area between the moving pairs is greatly reduced, and the possibility of the valve body and valve core getting stuck under different temperature environments is better avoided, thereby improving the product's working reliability and life, reducing the overall axial size of the product, and making the product's volume and weight very small. By adjusting the thickness of the valve cover metal sealing gasket, an additional adjustment method is provided for the opening pressure and working stroke of the fourth one-way valve.

[0037] The most difficult part in the production process of the forced-blowing one-way valve in a liquid rocket engine is the precision machining of the inner hole of the valve body. The inner hole of the valve body motion friction pair in the present invention is a single-size precision-machined hole without steps, and the size of the mounting hole of the third one-way valve assembly above the valve body is also the same as the size of the hole. This can simplify the processing technology, reduce the variety and quantity of tooling and measuring tools for processing and measurement, and reduce the production and processing costs of the product.

[0038] The present invention provides a filter screen on the dustproof and waterproof device at the rear end of the valve cover to prevent water vapor or dust in the air from entering the moving surface of the valve core during the reciprocating motion of the valve core, thereby causing the valve to become stuck, thereby improving the reliability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of a one-way valve assembly.

[0040] Figure 2 This is a schematic diagram of two one-way valve assemblies connected in series.

[0041] Figure 3 This is a schematic diagram of two one-way valve assemblies connected in parallel.

[0042] Figure 4 This is a schematic diagram of three one-way valve assemblies connected in series.

[0043] Figure 5 The figure is a schematic diagram of three one-way valve assemblies connected in series and parallel.

[0044] Figure 6 This is a schematic diagram of the second connection type of three one-way valve assemblies connected in series and parallel.

[0045] Figure 7 This is a schematic diagram of the third connection of three one-way valve assemblies in series and parallel.

[0046] Figure 8 This is a schematic diagram of the connection of four one-way valve assemblies, two in series and two in parallel.

[0047] Figure 9 This is a schematic diagram of four one-way valve assemblies, two in series and two in parallel, and another type of connection.

[0048] Figure 10 This is a schematic diagram of the connection of four one-way valve assemblies, two in series and three in parallel.

[0049] Figure 11 This is a schematic diagram of the second connection of four one-way valve assemblies, two in series and three in parallel.

[0050] Figure 12 This is a schematic diagram of the connection of four one-way valve assemblies, two of which are connected to three and the third one.

[0051] Figure 13 This is a schematic diagram of the fourth connection of four one-way valve assemblies, two in series and three in parallel.

[0052] Figure 14 This is a schematic diagram of the structure of a forced-blow-off one-way valve.

[0053] Figure markings: 1- one-way valve body, 2- valve core guide seat, 3- one-way valve spring, 4- valve core head, 5- valve stem, 6- first one-way valve assembly, 7- second one-way valve assembly, 8- third one-way valve assembly, 9- fourth one-way valve core, 10- center through hole, 11- center blind hole, 12- valve cover, 13- fourth one-way valve core spring, 14- first air inlet connector, 15- second air inlet connector, 16- filter screen, 17- radial non-metallic dynamic sealing ring, 18- static sealing ring, 19- metal sealing gasket. DETAILED DESCRIPTION

[0054] The present invention provides a one-way valve assembly, comprising a stepped one-way valve body 1 and a one-way valve core. A stepped through hole is provided at the center of the one-way valve body 1, and the one-way valve core is disposed in the stepped through hole. An external thread is provided on the outer peripheral surface of one end of the one-way valve body 1, which is the inlet end. The other end of the one-way valve body 1 is the outlet end. The stepped hole on the outlet end is provided with an internal thread that matches the external thread.

[0055] A valve core guide seat 2 is further provided in the stepped through hole. The valve core guide seat 2 is provided in one end of the stepped through hole close to the outlet end and is connected to the internal thread of the stepped through hole. The side of the valve core guide seat 2 facing the inlet end is sealedly connected to the step of the stepped through hole close to the outlet end.

[0056] The valve core guide seat 2 is provided with a medium flow hole for medium circulation;

[0057] The one-way valve core includes a valve core head 4 and a valve stem 5. The valve stem 5 is fixedly connected to the valve core head 4, and the central axis of the valve stem 5 is located on the same straight line as the central axis of the valve core head 4. The side of the valve core head 4 facing the inlet end is sealed with the step of the stepped through hole near the inlet end. The end of the valve stem 5 away from the valve core head 4 extends toward the valve core guide seat 2 and passes through the valve core guide seat 2.

[0058] The valve core head 4 is connected to the valve core guide seat 2 through a one-way valve spring 3.

[0059] A conical sealing pair is formed between a surface of the valve core guide seat 2 facing the inlet end and a step of the stepped through hole close to the outlet end.

[0060] A surface of the valve core head 4 facing the inlet end forms a conical sealing pair with the step of the stepped through hole close to the inlet end.

[0061] An annular cylindrical guide cylinder is fixedly provided on one end of the valve core guide seat 2 facing the valve core head 4. The end of the valve stem 5 away from the valve core head 4 extends into the guide cylinder and extends from the valve core guide seat 2.

[0062] A spring fixing groove is provided on one end of the valve core head 4 facing the valve core guide seat 2 , one end of the one-way valve spring 3 is provided in the spring fixing groove, and the other end is sleeved outside the guide cylinder and abuts against the valve core guide seat 2 .

[0063] The one-way valve spring 3 is a cylindrical compression spring.

[0064] In actual use, multiple one-way valve bodies 1 of the same type can be assembled to form a new valve body according to different needs, for example:

[0065] Connect two one-way valve assemblies in series or in parallel to form a new valve body assembly, such as Figure 2 and Figure 3 shown.

[0066] Connect three one-way valve assemblies in series to form a new valve body assembly, such as Figure 4 shown.

[0067] First, connect two one-way valve assemblies in series and then connect them in parallel with one one-way valve assembly to form a new valve body assembly, such as Figure 5 shown.

[0068] First, connect two one-way valve assemblies in series, and then connect a one-way valve assembly to the radial flow hole on one of the two one-way valve assemblies in series, such as Figure 6 、 Figure 7 shown.

[0069] Two one-way valve assemblies of the same type are connected in series to form a new valve body assembly, and two other one-way valve assemblies of the same type are connected in series to form a new valve body assembly, and then the two new valve body assemblies are connected in parallel. Figure 8 As shown, or connect the flow hole on a one-way valve assembly on a new valve body assembly to another new valve body assembly, as shown Figure 9 shown.

[0070] First connect two one-way valve assemblies in series, and then connect two one-way valve assemblies in parallel. Figure 10 As shown, or first connect two one-way valve assemblies of the same type in series, and then connect two one-way valve assemblies of the same type in parallel, as shown Figure 11 、 Figure 12 、 Figure 13 shown.

[0071] A forced-blow-off one-way valve comprises a valve body, wherein a one-way valve assembly is arranged in the valve body, wherein three one-way valve assemblies are provided, namely a first one-way valve assembly 6, a second one-way valve assembly 7 and a third one-way valve assembly 8;

[0072] The valve body is provided with a stepped central through hole 10, the external thread on the inlet end of the first one-way valve assembly 6 is matched and connected with the internal thread on the outlet end of the second one-way valve assembly 7, and the first one-way valve assembly 6 and the second one-way valve assembly 7 are both sealedly connected to the central through hole 10;

[0073] The end of the second one-way valve assembly 7 away from the first one-way valve assembly 6 is further connected to a fourth one-way valve core 9 assembly. A central blind hole 11 communicating with the inlet end of the second one-way valve assembly 7 is provided at the center of the fourth one-way valve core 9 assembly. A connecting hole communicating with the central blind hole 11 is provided on the circumference of the fourth one-way valve core 9.

[0074] One end of the fourth one-way valve core 9 away from the second one-way valve assembly 7 is sealed with a valve cover 12, and the valve cover 12 is arranged to block the end of the central through hole 10 and is sealed with the valve body;

[0075] The fourth one-way valve core 9 is connected to the valve cover 12 via a fourth one-way valve core spring 13. The fourth one-way valve core spring 13 is sleeved on one end of the fourth one-way valve core 9, and one end of the fourth one-way valve core spring 13 is fixedly connected to the valve cover 12, and the other end thereof abuts against the step on the fourth one-way valve core 9.

[0076] A first air inlet connector 14 is provided on the valve body at a position corresponding to the fourth one-way valve core 9. When the first one-way valve assembly 6 and the second one-way valve assembly 7 push the fourth one-way valve core 9 to reciprocate, the communicating hole connects the first air inlet connector 14 and the central blind hole 11 or blocks the first air inlet connector 14 and the central blind hole 11.

[0077] A second air inlet connector 15 is provided on the valve body at a position corresponding to the second one-way valve assembly 7. A radial flow hole is provided on the one-way valve body 1 of the second one-way valve assembly 7. The radial flow hole is provided on the one-way valve body 1 between the valve core guide seat 2 and the sealing connection between the valve core head 4 and the stepped through hole.

[0078] The second air inlet connector 15 is connected to the radial flow hole through the third one-way valve assembly 8 .

[0079] In one embodiment, a dustproof and waterproof device is provided on the side of the valve cover 12 away from the second one-way valve assembly 7, and the end of the fourth one-way valve core 9 away from the second one-way valve assembly 7 is sealed with the valve cover 12 through a radial non-metallic dynamic sealing ring 17, and extends into the dustproof and waterproof device after passing through the valve cover 12.

[0080] The dustproof and waterproof device includes a screw plug, which is fixed and sealed to the valve cover 12 through a sealing ring column. The screw plug is threadedly connected to the sealing ring column. An air flow hole is provided at the center of the screw plug, and a filter 16 is provided on the air flow hole to prevent water vapor or dust in the air from entering.

[0081] In another embodiment, the first one-way valve assembly 6, the second one-way valve assembly 7 and the fourth one-way valve core 9 are respectively connected to the valve body through a radial non-metallic dynamic sealing ring 17;

[0082] The third one-way valve assembly 8 and the second one-way valve assembly 7 are respectively sealed and connected to the valve body through static sealing rings 18.

[0083] Metal sealing gaskets 19 are provided between the valve body and the valve cover 12 , and between the second air inlet connector 15 and the third one-way valve assembly 8 .

[0084] When using, such as Figure 13As shown, the second air inlet connector 15 of the valve body is connected to the purge nitrogen bottle, and the first air inlet connector 14 of the valve body is connected to the purge helium bottle. When the engine is started, the fourth one-way valve core 9 moves leftward under the action of the helium pressure and the fourth one-way valve spring 3, and the connecting hole is closed, thereby closing the helium purge and using nitrogen purge. Nitrogen enters the stepped through hole of the third one-way valve assembly 8 from the inlet end of the third one-way valve assembly 8, and then enters the outlet end of the second one-way valve assembly 7, that is, the inlet end of the first one-way valve assembly 6, from the outlet end of the third one-way valve assembly 8 through the radial flow hole on the second one-way valve assembly 7, and then flows out from the outlet end of the first one-way valve assembly 6 to purge the generator kerosene chamber. As the purge process proceeds, the pressure in the purge chamber gradually increases. When it increases to a certain pressure, the nitrogen purge is completed. When the purge outlet pressure is greater than the purge nitrogen inlet pressure, the nitrogen purge is stopped. At this time, the first one-way valve assembly 6, the second one-way valve assembly 7, and the third one-way valve assembly 8 are closed under the action of the pressure difference. Because the pressure at the left end of the plunger assembly composed of the one-way valve assembly 6 and the second one-way valve assembly 7 is greater than the combined force of the helium pressure at the right end of the fourth one-way valve core 9 and the fourth one-way valve core spring 13, the plunger assembly drives the fourth one-way valve core 9 to move right, and the connecting hole is opened; when the engine is shut down, after the blow-off outlet pressure drops to a certain value, nitrogen and helium are simultaneously blown out of the generator kerosene chamber; therefore, a forced blow-off one-way valve of the present invention can achieve blow-off with only nitrogen when the engine is started, and use the remaining gas in the helium cylinder to forcibly blow out the generator kerosene chamber when the engine is shut down. In the blow-off system of the prior art, when the rocket reaches the predetermined orbit and the engine is shut down, the remaining gas in the cylinder is often seriously surplus. The excess gas stored in the cylinder is equivalent to the loss of part of the rocket's payload. In this way, the gas carried by the engine is fully utilized. At the same time, after the engine is shut down, the inert gas helium is finally used to blow out the kerosene chamber of the liquid oxygen-kerosene engine generator, which can solve part of the current problem of engine kerosene coking.

Claims

1. A forced blow-off one-way valve, comprising a valve body, characterized in that: A one-way valve assembly is provided in the valve body, and the one-way valve assembly comprises a stepped one-way valve body (1) and a one-way valve core, a stepped through hole is provided at the center of the one-way valve body (1), and the one-way valve core is provided in the stepped through hole, and is characterized in that an external thread is provided on the outer peripheral surface of one end of the one-way valve body (1), and the end is the inlet end, and the other end of the one-way valve body (1) is the outlet end, and an internal thread matching the external thread is provided on the stepped hole on the outlet end; A valve core guide seat (2) is further provided in the stepped through hole. The valve core guide seat (2) is provided in one end of the stepped through hole close to the outlet end and is connected to the internal thread of the stepped through hole. The side of the valve core guide seat (2) facing the inlet end is sealedly connected to the step of the stepped through hole close to the outlet end. The valve core guide seat (2) is provided with a medium flow hole for medium circulation; The one-way valve core comprises a valve core head (4) and a valve stem (5), the valve stem (5) is fixedly connected to the valve core head (4), and the central axis of the valve stem (5) and the central axis of the valve core head (4) are located on the same straight line, the side of the valve core head (4) facing the inlet end is sealedly connected to the step of the stepped through hole near the inlet end, and the end of the valve stem (5) away from the valve core head (4) extends toward the valve core guide seat (2) and passes through the valve core guide seat (2); The valve core head (4) is connected to the valve core guide seat (2) via a one-way valve spring (3); The one-way valve assembly is provided in three parts, namely a first one-way valve assembly (6), a second one-way valve assembly (7) and a third one-way valve assembly (8); The valve body is provided with a stepped central through hole (10), the external thread on the inlet end of the first one-way valve assembly (6) is matched and connected with the internal thread on the outlet end of the second one-way valve assembly (7), and the first one-way valve assembly (6) and the second one-way valve assembly (7) are both sealed and connected to the central through hole (10); A fourth one-way valve core (9) component is further connected to the end of the second one-way valve component (7) away from the first one-way valve component (6); a central blind hole (11) communicating with the inlet end of the second one-way valve component (7) is provided at the center of the fourth one-way valve core (9); and a connecting hole communicating with the central blind hole (11) is provided on the circumferential surface of the fourth one-way valve core (9); One end of the fourth one-way valve core (9) away from the second one-way valve assembly (7) is sealed with a valve cover (12), and the valve cover (12) is arranged to block the end of the central through hole (10) and is sealed with the valve body; The fourth one-way valve core (9) is connected to the valve cover (12) via a fourth one-way valve core spring (13), the fourth one-way valve core spring (13) is sleeved on one end of the fourth one-way valve core (9), and one end of the fourth one-way valve core spring (13) is fixedly connected to the valve cover (12), and the other end abuts against the step on the fourth one-way valve core (9); A first air inlet connector (14) is provided on the valve body at a position corresponding to the fourth one-way valve core (9); when the first one-way valve assembly (6) and the second one-way valve assembly (7) push the fourth one-way valve core (9) to move back and forth, the communicating hole connects the first air inlet connector (14) and the central blind hole (11), or the communicating hole closes the first air inlet connector (14) and the central blind hole (11); A second air inlet connector (15) is provided on the valve body at a position corresponding to the second one-way valve assembly (7), and a radial flow hole is provided on the one-way valve body (1) of the second one-way valve assembly (7), wherein the radial flow hole is provided on the one-way valve body (1) between the valve core guide seat (2) and the valve core head (4) and the sealed connection with the stepped through hole; The second air inlet connector (15) is connected to the radial flow hole via a third one-way valve assembly (8).

2. A forced blow-off one-way valve as claimed in claim 1, characterized in that: A surface of the valve core guide seat (2) facing the inlet end forms a conical sealing pair with the step of the stepped through hole close to the outlet end.

3. A forced blow-off one-way valve as claimed in claim 2, characterized in that: A surface of the valve core head (4) facing the inlet end forms a conical sealing pair with a step of the stepped through hole close to the inlet end.

4. A forced blow-off one-way valve as claimed in claim 3, characterized in that: An annular cylindrical guide cylinder is fixedly provided on one end of the valve core guide seat (2) facing the valve core head (4); an end of the valve stem (5) away from the valve core head (4) extends into the guide cylinder and extends from the valve core guide seat (2); A spring fixing groove is provided on one end of the valve core head (4) facing the valve core guide seat (2); one end of the one-way valve spring (3) is provided in the spring fixing groove, and the other end is sleeved outside the guide cylinder and abuts against the valve core guide seat (2).

5. A forced blow-off one-way valve as claimed in claim 4, characterized in that: The one-way valve spring (3) is a cylindrical compression spring.

6. A forced blow-off one-way valve as claimed in claim 1, characterized in that: A dustproof and waterproof device is provided on the side of the valve cover (12) away from the second one-way valve assembly (7), and the end of the fourth one-way valve core (9) away from the second one-way valve assembly (7) is sealed and connected to the valve cover (12) through a radial non-metallic dynamic sealing ring (17), and extends into the dustproof and waterproof device after passing through the valve cover (12).

7. A forced blow-off one-way valve as claimed in claim 6, characterized in that: The dustproof and waterproof device comprises a screw plug, which is fixed and sealed to the valve cover (12) via a sealing ring column, the screw plug is threadedly connected to the sealing ring column, an air flow hole is provided at the center of the screw plug, and a filter (16) is provided on the air flow hole for preventing water vapor or dust in the air from entering.

8. A forced blow-off one-way valve as claimed in claim 7, characterized in that: The connection points between the first one-way valve assembly (6), the second one-way valve assembly (7) and the fourth one-way valve core (9) are respectively sealed and connected to the valve body via radial non-metallic dynamic sealing rings (17); The third one-way valve assembly (8) and the second one-way valve assembly (7) are respectively connected to the valve body in a sealing manner via a static sealing ring (18).

9. A forced blow-off one-way valve as claimed in claim 8, characterized in that: Metal sealing gaskets (19) are provided between the valve body and the valve cover (12), and between the second air inlet connector (15) and the third one-way valve assembly (8).

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