Pneumatic control valve, engine and control method for control valve

Abstract

This invention relates to the field of rocket engine technology, and discloses a pneumatic regulating valve, an engine, and a method for controlling the regulating valve. The pneumatic regulating valve includes a housing, an regulating component, and an elastic element. The housing has a gas passage, a mounting chamber, a connecting hole, and an air inlet. The connecting hole connects the gas passage and the mounting chamber, and the air inlet connects the mounting chamber and a gas source. The regulating component is disposed within the mounting chamber and divides the mounting chamber into a first chamber connecting the air inlet and a second chamber connecting the connecting hole. The pressure in the first chamber is adjustable to drive the regulating component closer to the connecting hole. The regulating component includes a valve stem that extends through the connecting hole to the gas passage, suitable for adjusting the throttling area of ​​the gas passage. The elastic element drives the regulating component away from the connecting hole. The regulating component also includes a cooling channel that extends along the valve stem and connects the first chamber and the gas passage. This invention provides pneumatic control adjustment of the throttling area and reduces the erosion effect of the gas on the valve stem.

Description

Technical Field

[0001] This invention relates to the field of rocket engine technology, specifically to a pneumatic regulating valve, an engine, and a regulating valve control method. Background Technology

[0002] In adjusting the thrust of rocket engines, related technologies often utilize gas regulating valves. These valves operate continuously in high-temperature environments of 500℃ to 700℃, placing high demands on the materials and precision of the valve body.

[0003] In related technologies, motor-driven control valves face structural deformation issues due to long-term ablation, leading to operational stagnation or even reduced control accuracy. To ensure control accuracy, higher requirements are placed on the temperature resistance of materials and electronic components, increasing implementation difficulty and cost. Summary of the Invention

[0004] In view of this, the present invention provides a pneumatic regulating valve, an engine, and a regulating valve control method to solve the problem of high-temperature erosion affecting the regulating accuracy of the regulating valve.

[0005] In a first aspect, the present invention provides a pneumatic regulating valve, comprising a housing, an regulating component, and an elastic element. The housing is provided with a gas passage, a mounting chamber, a connecting hole, and an air inlet. The connecting hole connects the gas passage and the mounting chamber. The air inlet connects the mounting chamber and a gas source. The regulating component is disposed in the mounting chamber and divides the mounting chamber into a first chamber connecting the air inlet and a second chamber connecting the connecting hole. The pressure in the first chamber is adjustable to drive the regulating component closer to the connecting hole. The regulating component includes a valve stem that extends through the connecting hole to the gas passage and is adapted to adjust the throttling area of ​​the gas passage. The elastic element drives the regulating component away from the connecting hole. The regulating component also includes a cooling passage that extends along the valve stem and connects the first chamber and the gas passage.

[0006] Beneficial effects: The pressure in the first chamber and the elastic force of the elastic element form a force balance. By adjusting the pressure in the first chamber, the regulating component can be actuated, thereby realizing the pneumatic control of the throttling area. The high-pressure gas entering the first chamber can be ejected from the valve stem along the cooling channel. On the one hand, it can exchange heat and cool the valve stem in the cooling channel. On the other hand, it can form a gas film around the outlet after being ejected, which plays a protective role, reduces the erosion effect of the gas on the valve stem, and reduces the impact of high temperature on the regulation accuracy.

[0007] In one optional embodiment, the regulating assembly further includes a bellows and a valve disc, the valve stem being disposed on the side of the valve disc facing the communication hole, one end of the bellows being connected to the side of the valve disc away from the communication hole, and the other end being connected to the wall of the mounting chamber, the interior of the bellows forming the first cavity.

[0008] Beneficial effects: Air pressure acts on the regulating component, driving the bellows to extend and simultaneously causing the valve disc to move towards the connecting hole. Using the bellows to construct the first chamber helps improve the sealing effect of the first chamber, preventing pressure leakage and improving the control accuracy of the pneumatic regulating valve. The valve disc provides a flat force-bearing surface, making the direction of the force more accurate and helping to make the movement of the valve stem smoother.

[0009] In one alternative embodiment, a first seal is further included, disposed between the wall of the connecting hole and the valve stem, for sealing the gap between the connecting hole and the valve stem.

[0010] Beneficial effects: The first seal can prevent gas leakage, thereby preventing gas in the gas passage from entering the second chamber, ensuring that the pressure in the second chamber remains stable, and improving the control accuracy of the pneumatic regulating valve.

[0011] In one alternative embodiment, the housing further includes a balancing hole that communicates with the second cavity.

[0012] Beneficial effect: The balance hole keeps the air pressure in the second chamber balanced, improving the control accuracy of the pneumatic regulating valve.

[0013] In one optional embodiment, a guide ring is further included, the guide ring being located in the second cavity, and the valve stem passing through the guide ring; the elastic element is sleeved on the valve stem, one end of the elastic element abutting against the adjusting assembly, and the other end abutting against the guide ring.

[0014] Beneficial effects: Using a guide ring for guidance helps make the movement of the valve stem smoother; the guide ring and valve stem are also used to install the elastic element, which can also fix the guide ring, thereby simplifying the overall structure of the pneumatic control valve and making the position of the elastic element more stable.

[0015] In one alternative embodiment, the gas passage includes an angled inlet section and an outlet section, the outlet section forming a throttling orifice, and the valve stem and the outlet section are arranged coaxially.

[0016] Beneficial effects: The valve stem can be moved closer to or further away from the throttling orifice to adjust the throttling area. The inlet and outlet sections are at an angle, thereby preventing the valve stem from interfering with the gas input.

[0017] In one alternative embodiment, the valve stem includes a head located at one end away from the first cavity, the diameter of which gradually decreases along the direction away from the first cavity.

[0018] Beneficial effects: The valve stem head adopts a tapered design, which can gradually reduce the cross-sectional area of ​​the gas passage, reduce the disturbance of the valve stem to the flow field, and reduce the flow resistance and deposition of the pneumatic regulating valve.

[0019] In one alternative embodiment, the regulating component is further provided with jet holes, a plurality of jet holes being arranged circumferentially around the head and inclined toward the downstream direction of the gas passage, the cooling passage communicating with the jet holes.

[0020] Beneficial effects: The jet orifice is located at the head, which better protects the valve stem and reduces the erosion effect of the gas on the valve stem. The inclined design of the jet orifice can reduce the disturbance of the flow field by the ejected jet and reduce the flow resistance of the pneumatic regulating valve.

[0021] Secondly, the present invention also provides an engine, including the pneumatic regulating valve provided by the present invention.

[0022] Beneficial effects: The engine includes the pneumatic regulating valve provided by the present invention, and therefore has the corresponding beneficial effects brought by the pneumatic regulating valve, which will not be elaborated here.

[0023] Thirdly, the present invention also provides a regulating valve control method, wherein the regulating valve control method uses the pneumatic regulating valve provided by the present invention, and the regulating valve control method includes: adjusting the pressure of the first chamber to adjust the throttling area of ​​the gas passage; and spraying gas along the cooling passage to cool the valve stem.

[0024] Beneficial effects: The regulating valve control method uses the pneumatic regulating valve provided by this invention, and therefore has the corresponding beneficial effects brought by the pneumatic regulating valve, which will not be elaborated here. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional schematic diagram of a pneumatic regulating valve according to an embodiment of the present invention, showing the state when the valve stem is retracted;

[0027] Figure 2This is a cross-sectional schematic diagram of a pneumatic regulating valve according to an embodiment of the present invention, showing the state when the valve stem is extended;

[0028] Figure 3 This is a schematic diagram of the shell structure according to an embodiment of the present invention;

[0029] Figure 4 This is a partial schematic diagram of the pneumatic regulating valve according to an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Housing; 101. Gas passage; 1011. Inlet section; 1012. Outlet section; 102. Installation chamber; 1021. First chamber; 1022. Second chamber; 103. Connecting hole; 104. Air inlet; 105. Balance hole; 106. First housing; 107. Second housing; 108. End cap; 2. Adjustment assembly; 201. Valve stem; 2011. Head; 202. Cooling passage; 203. Bellows; 204. Valve disc; 205. Jet hole; 3. Elastic element; 401. First seal; 402. Second seal; 403. Third seal; 5. Guide ring; 601. Air inlet connector; 602. Exhaust connector. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a," "an," and "comprising" as used herein may also mean including the plural forms. The terms "comprising," "including," and "having" are inclusive and therefore indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0034] Although terms such as "first," "second," etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Furthermore, in the description of this invention, unless otherwise expressly specified and limited, the terms "set up" and "connected" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection via an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "end," "length," "inner," "outer," etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation, in addition to those depicted in the figure. For example, if the mechanism in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The mechanism may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0036] Rocket engines maintain optimal performance by regulating the flow of combustion gases. High-temperature combustion gases can cause ablation and deposition in regulating valves, affecting their accuracy. In related technologies, needle valves and butterfly valves regulate flow through linear reciprocating motion. While the valve stem 201 exhibits good anti-deposition properties, it suffers from severe erosion and ablation.

[0037] In related technologies, motor-driven control valves may experience structural deformation of the valve stem 201 due to long-term ablation, leading to operational stagnation or even a decrease in control accuracy.

[0038] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0039] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4According to an embodiment of the present invention, a pneumatic regulating valve is provided, comprising a housing 1, a regulating component 2, and an elastic element 3. The housing 1 is provided with a gas passage 101, a mounting chamber 102, a connecting hole 103, and an air inlet 104. The connecting hole 103 connects the gas passage 101 and the mounting chamber 102. The air inlet 104 connects the mounting chamber 102 and a gas source. The regulating component 2 is disposed within the mounting chamber 102 and divides the mounting chamber 102 into a first cavity 1021 connecting the air inlet 104 and a connecting hole 104. The pressure of the second chamber 1022 of the first chamber 1021 is adjustable to drive the regulating component 2 closer to the connecting hole 103. The regulating component 2 includes a valve stem 201 that extends through the connecting hole 103 to the gas passage 101 and is suitable for adjusting the throttling area of ​​the gas passage 101. The elastic member 3 is used to drive the regulating component 2 away from the connecting hole 103. The regulating component 2 is also provided with a cooling passage 202 that extends along the valve stem 201 and connects the first chamber 1021 and the gas passage 101.

[0040] High-pressure gas can be injected into the first chamber 1021 through the air inlet 104. The pressure in the first chamber 1021 and the elastic force of the elastic element 3 form a force balance. By adjusting the pressure of the gas injected into the first chamber 1021, the regulating component 2 can be actuated, causing the valve stem 201 to move linearly along its own axis, thereby realizing the pneumatic control adjustment of the throttling area.

[0041] The high-pressure gas entering the first chamber 1021 can flow along the cooling channel 202 and be ejected from the valve stem 201. On the one hand, the high-pressure gas exchanges heat with the valve stem 201 in the cooling channel 202, cooling the valve stem 201. On the other hand, after being ejected, the high-pressure gas can form a gas film around the outlet, which plays a protective role, preventing the high-temperature gas from eroding the valve stem 201, thereby reducing the erosion effect of the gas on the valve stem 201 and reducing the impact of high temperature on the adjustment accuracy.

[0042] It is understood that in this invention, the valve stem 201 adjusts the throttling area through linear motion. Therefore, the pneumatic regulating valve can be a needle valve, a butterfly valve, or other regulating valves based on linear motion, and this invention does not limit this.

[0043] The high-pressure gas used in the regulation process is at a lower temperature than the combustion gas, thus achieving the effects of heat exchange and protection. Optionally, the high-pressure gas can be a room-temperature high-pressure gas, and the high-pressure gas can be nitrogen, helium, etc.

[0044] The regulating component 2 can construct a first cavity 1021 and a second cavity 1022 within the mounting chamber 102 in different ways. Optionally, in some embodiments, the regulating component 2 further includes a bellows 203 and a valve disc 204. The valve stem 201 is disposed on the side of the valve disc 204 facing the connecting hole 103. One end of the bellows 203 is connected to the side of the valve disc 204 away from the connecting hole 103, and the other end is connected to the wall of the mounting chamber 102. The interior of the bellows 203 forms the first cavity 1021.

[0045] Reference Figure 2 When it is necessary to reduce the throttling area, the air pressure of the first chamber 1021 is increased. The pressure acts on the regulating component 2. Due to the pressure difference between the first chamber 1021 and the second chamber 1022, the valve disc 204 is subjected to a force toward the connecting hole 103, thereby overcoming the elastic force of the elastic element 3 and approaching the connecting hole 103. At the same time, the bellows 203 extends to maintain the stability of the first chamber 1021.

[0046] Specifically, the bellows 203 can be welded to the valve disc 204 and the housing 1 respectively. Using the bellows 203 to construct the first cavity 1021 helps to improve the sealing effect of the first cavity 1021, prevent pressure leakage, and improve the control accuracy of the pneumatic regulating valve. The valve disc 204 provides a flat force-bearing surface, making the direction of the force more accurate and helping to make the movement of the valve stem 201 smoother.

[0047] In addition to the first cavity 1021 constructed based on the bellows 203, in some embodiments not shown, the valve disc 204 can also directly abut against the wall of the mounting chamber 102, with a dynamic seal between them, thereby using the valve disc 204 to separate the first cavity 1021 and the second cavity 1022. However, in this case, the machining accuracy of the wall surface is required to be high, and the linear movement of the adjusting component 2 will be subject to additional frictional resistance, which may have a negative impact on the temperature and pressure control of the mounting chamber 102.

[0048] In addition to the methods exemplified above, the adjustment component 2 can also construct the first cavity 1021 in other ways. For details, please refer to the relevant technologies, which will not be elaborated here.

[0049] Optionally, in some embodiments, the pneumatic regulating valve further includes a first seal 401 disposed between the wall of the connecting hole 103 and the valve stem 201, for sealing the gap between the connecting hole 103 and the valve stem 201.

[0050] It is understandable that the pneumatic regulating valve achieves the linear movement of the regulating component 2 through the pressure difference between the first chamber 1021 and the second chamber 1022. Therefore, the pressure in the second chamber 1022 needs to remain stable at all times to provide a reliable reference and ensure control accuracy. By using the first sealing element 401, gas leakage in the gas passage 101 can be reduced, thereby preventing gas in the gas passage 101 from entering the second chamber 1022, ensuring that the pressure in the second chamber 1022 remains stable, and improving the control accuracy of the pneumatic regulating valve.

[0051] Clearly, the first seal 401 forms a dynamic seal, preventing obstruction of the linear movement of the valve stem 201. The first seal 401 can be packing material; specifically, refer to... Figure 3 The wall of the connecting hole 103 is recessed with an annular sealing groove, and the first sealing element 401 is filled in the sealing groove and abuts against the valve stem 201 passing through the connecting hole 103.

[0052] Furthermore, in some embodiments, the housing 1 further includes a balancing hole 105, which connects to the second chamber 1022. The second chamber 1022 is used to communicate with an external constant pressure environment (e.g., the atmosphere). Even if the gas passage 101 leaks, or the gas in the second chamber 1022 expands or contracts due to temperature changes, the pressure in the second chamber 1022 can be compensated through the balancing hole 105 to ensure that the gas pressure in the second chamber 1022 remains stable over a long period of time.

[0053] In some embodiments, the pneumatic control valve further includes a guide ring 5 located in the second chamber 1022, through which the valve stem 201 passes. To meet the requirements of dynamic sealing, the fitting clearance between the valve stem 201 and the connecting hole 103 is appropriately increased, making it difficult to guide and position the valve stem 201 using only the connecting hole 103. By adding the guide ring 5 located in the second chamber 1022, the guide ring 5 serves as the second fulcrum of the valve stem 201, guiding the valve stem 201 and helping to make the movement of the valve stem 201 smoother.

[0054] Optionally, refer to Figure 2 and Figure 3 In some embodiments, the housing 1 further includes a positioning hole, which connects the second cavity 1022 and the connecting hole 103 and is coaxially arranged with the connecting hole 103. The junction of the positioning hole and the second cavity 1022 forms a positioning step. The guide ring 5 includes a sleeve and a flange surrounding the outer periphery of the sleeve. The sleeve is at least partially inserted into the positioning hole, thereby making the guide ring 5 and the connecting hole 103 coaxially arranged. The positioning step abuts against the flange, thereby positioning the guide ring 5 in the axial direction of the connecting hole 103.

[0055] Furthermore, in some embodiments, the elastic element 3 is also located in the second cavity 1022. The elastic element 3 is sleeved on the valve stem 201, with one end of the elastic element 3 abutting against the adjusting assembly 2 and the other end abutting against the guide ring 5. In this case, the elastic element 3 is a compression spring. The guide ring 5 and the valve stem 201 are also used to install the elastic element 3. The elastic element 3 can also press the guide ring 5 against the positioning step to achieve the positioning of the guide ring 5, thereby simplifying the overall structure of the pneumatic regulating valve and making the position of the elastic element 3 more stable.

[0056] Optionally, in some embodiments, the gas passage 101 includes an angled inlet section 1011 and an outlet section 1012, with the outlet section 1012 forming a throttling orifice. The valve stem 201 and the outlet section 1012 are arranged coaxially. The diameter of the outlet section 1012 first decreases and then increases, thereby forming a throttling orifice. The valve stem 201 is positioned close to or away from the throttling orifice to adjust the throttling area. The inlet section 1011 and the outlet section 1012 are angled to prevent the valve stem 201 from interfering with the gas input.

[0057] For example, refer to Figure 2 The entrance section 1011 and the exit section 1012 are arranged at right angles.

[0058] Furthermore, in some embodiments, the valve stem 201 includes a head 2011 located at the end away from the first cavity 1021, and the diameter of the head 2011 gradually decreases along the direction away from the first cavity 1021. In other words, the pneumatic regulating valve is a needle valve at this time, and the head 2011 of the valve stem 201 adopts a tapered design, which can gradually reduce the cross-sectional area of ​​the gas passage 101, reduce the disturbance of the flow field by the valve stem 201, and reduce the flow resistance and deposition of the pneumatic regulating valve.

[0059] In some embodiments, refer to Figure 4 The regulating component 2 is also provided with jet holes 205. Multiple jet holes 205 are arranged circumferentially around the head 2011 and are inclined towards the downstream direction of the gas passage 101. The cooling passage 202 is connected to the jet holes 205. The head 2011 and the throttling orifice cooperate to adjust the throttling area. Therefore, the gas flow velocity around the head 2011 is relatively fast, resulting in more severe scouring and erosion of the valve stem 201. By placing the jet holes 205 in the head 2011, a gas film can be formed in the head 2011 in a targeted manner, which better protects the valve stem 201 and reduces the erosive effect of the gas on the valve stem 201. The inclined design of the jet holes 205 can reduce the disturbance of the ejected jet on the flow field and reduce the flow resistance of the pneumatic regulating valve.

[0060] exist Figure 1 , Figure 2 , Figure 3 , Figure 4In the illustrated embodiment, the jet orifice 205 is only distributed at the head 2011 of the valve stem 201, so the pneumatic regulating valve only forms an air film at the head 2011. In other embodiments not shown, depending on the ablation situation, the jet orifice 205 may also be distributed at other parts of the valve stem 201, and the present invention does not limit this.

[0061] In some embodiments, refer to Figure 3 The housing 1 includes a first housing 106 and a second housing 107. A gas passage 101 is located in the first housing 106, and an installation chamber 102 is located in the second housing 107. A connecting hole 103 is located at one end of the second housing 107 and connects to the installation chamber 102. The housing 1 also includes a first mounting hole provided in the first housing 106. The first mounting hole is located at one end of the first housing 106, connects to the gas passage 101, and is coaxial with the outlet section 1012. The second housing 107 is inserted into the first mounting hole, so that the connecting hole 103 connects the gas passage 101 and the installation chamber 102.

[0062] Optionally, the pneumatic regulating valve further includes a second seal 402, which is disposed between the first housing 106 and the second housing 107. Clearly, the second seal 402 is a static seal, capable of sealing the gap between the first housing 106 and the second housing 107 to prevent gas leakage from the first mounting hole.

[0063] For example, in some embodiments, the end face of the first housing 106 is recessed with a second sealing groove, the end face of the second housing 107 is protruded with a first pressing ring, and the second sealing element 402 is a sealing ring (e.g., a graphite sealing ring). The sealing ring is disposed in the second sealing groove and is pressed by the first pressing ring to achieve a sealing effect.

[0064] Furthermore, in some embodiments, the housing 1 further includes an end cap 108 and a second mounting hole disposed on the second housing 107. The second mounting hole is located at the opposite end of the second housing 107 and the connecting hole 103, communicating with the mounting chamber 102, and is larger in size than the valve disc 204. The end cap 108 is detachably mounted on the second mounting hole. The adjustment component 2 is installed into the mounting chamber 102 through the second mounting hole, which facilitates maintenance of the adjustment component 2.

[0065] Optionally, in some embodiments, the pneumatic regulating valve further includes a third seal 403 disposed between the second housing 107 and the end cap 108.

[0066] For example, in some embodiments, the end face of the third housing 1 is recessed with a third sealing groove, the end face of the end cover 108 is protruded with a second pressing ring, and the third sealing element 403 is a sealing ring (e.g., a graphite sealing ring). The sealing ring is disposed in the third sealing groove and is pressed by the second pressing ring to achieve a sealing effect.

[0067] In addition to using sealing rings, the second seal 402 and the third seal 403 can also be sealed using packing.

[0068] Optionally, in some embodiments, one end of the bellows 203 is welded to the end cap 108. In other words, the pneumatic regulating valve first assembles the regulating component 2 based on the end cap 108 to construct the first cavity 1021, and then installs the end cap 108 onto the second housing 107 to seal the mounting chamber 102 and form the second cavity 1022. At this time, the regulating component 2 can be installed, disassembled, and maintained outside the mounting chamber 102, effectively improving the maintainability of the regulating component 2.

[0069] In some embodiments, the pneumatic regulating valve further includes an air inlet connector 601 and an air outlet connector 602. The air inlet connector 601 is disposed on the housing 1 (specifically on the end cap 108 in this embodiment) by welding or fastener connection and communicates with the air inlet 104. The air inlet connector 601 is used to connect to an air source (e.g., to an air pipe). The air outlet connector 602 is disposed on the housing 1 (specifically on the second housing 107 in this embodiment) by welding or fastener connection and communicates with the balance hole 105. The air outlet connector 602 is used to connect to a constant pressure environment (e.g., to an air pipe).

[0070] Overall, in Figure 1 In the illustrated embodiments, the pneumatic regulating valve of the present invention has the following advantages:

[0071] 1. Compared to motor-driven control valves, the pneumatic control valve of this invention eliminates the need to consider high-temperature insulation issues for the motor, making the entire pneumatic control valve suitable for high-temperature environments. It also boasts high space utilization, a simple structure, and a simple manufacturing process. Eliminating the motor also improves reliability and economy, facilitating mass production and customization.

[0072] 2. High-pressure gas can be introduced into the gas passage 101 to cool the valve stem 201, improve the working environment temperature of the first seal 401 and the head 2011, and increase the product life.

[0073] 3. The high-pressure secondary flow injected into the head 2011 can change the pressure and flow rate at the throttling position, forming a wall shear layer and reducing the erosion effect of the gas on the head 2011.

[0074] 4. The pneumatic regulating valve has a simple structure and is relatively easy to control, which is conducive to achieving precise regulation of fuel flow in the fuel supply system.

[0075] Secondly, the present invention also provides an engine, including the pneumatic regulating valve provided by the present invention.

[0076] The engine includes the pneumatic regulating valve provided by the present invention, and therefore has the beneficial effects brought by the pneumatic regulating valve, which will not be elaborated here.

[0077] The present invention also provides a control method for a regulating valve, which uses the pneumatic regulating valve provided by the present invention and includes the following steps:

[0078] Step S110: Adjust the pressure of the first chamber 1021 to adjust the throttling area of ​​the gas passage 101.

[0079] Specifically, an external air source delivers high-pressure gas to the first chamber 1021 through the air inlet connector 601. The pressure of the air source is adjusted according to the target throttling area, so that the valve disc 204 is closer to or further away from the connecting hole 103.

[0080] Step S120: Gas is ejected along the cooling channel 202 to cool the valve stem 201.

[0081] Specifically, since the first chamber 1021 is under high pressure, the gas will be ejected from the cooling channel 202 under the action of pressure difference. On the one hand, it cools the valve stem 201, and on the other hand, it forms a gas film at the ejection part to separate the valve stem 201 from the high-temperature gas and reduce the erosion of the valve stem 201 by the high-temperature gas.

[0082] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A pneumatic regulating valve, characterized in that, include: The housing (1) is provided with a gas passage (101), an installation chamber (102), a connecting hole (103) and an air inlet (104). The connecting hole (103) connects the gas passage (101) and the installation chamber (102), and the air inlet (104) connects the installation chamber (102) and the gas source. An adjustment component (2) is disposed in the mounting chamber (102) and divides the mounting chamber (102) into a first chamber (1021) communicating with the air inlet (104) and a second chamber (1022) communicating with the connecting hole (103). The pressure of the first chamber (1021) is adjustable to drive the adjustment component (2) closer to the connecting hole (103). The adjustment component (2) includes a valve stem (201) that extends through the connecting hole (103) to the gas passage (101) and is adapted to adjust the throttling area of ​​the gas passage (101). An elastic element (3) is used to drive the adjustment assembly (2) away from the connecting hole (103). The regulating component (2) is also provided with a cooling channel (202), which extends along the valve stem (201) and connects the first chamber (1021) and the gas passage (101). The gas passage (101) includes an angled inlet section (1011) and an outlet section (1012), the outlet section (1012) forming a throttle orifice, and the valve stem (201) and the outlet section (1012) being arranged coaxially; The gas passage (101) is used to transport high-temperature gas. The gas source is used to inject high-pressure gas into the first chamber (1021) through the air inlet (104). The temperature of the high-pressure gas is lower than that of the high-temperature gas. It can flow along the cooling passage (202) and be ejected from the valve stem (201) to form a gas film around the outlet, thereby preventing the high-temperature gas from scouring the valve stem (201).

2. The pneumatic regulating valve according to claim 1, characterized in that, The regulating assembly (2) further includes a bellows (203) and a valve disc (204). The valve stem (201) is disposed on the side of the valve disc (204) facing the connecting hole (103). One end of the bellows (203) is connected to the side of the valve disc (204) away from the connecting hole (103), and the other end is connected to the wall of the mounting chamber (102). The interior of the bellows (203) forms the first cavity (1021).

3. The pneumatic regulating valve according to claim 1 or 2, characterized in that, It also includes a first seal (401), which is disposed between the wall of the connecting hole (103) and the valve stem (201) for sealing the gap between the connecting hole (103) and the valve stem (201).

4. The pneumatic regulating valve according to claim 3, characterized in that, The housing (1) also includes a balancing hole (105) that connects to the second cavity (1022).

5. The pneumatic regulating valve according to claim 1, characterized in that, It also includes a guide ring (5), which is located in the second cavity (1022), and the valve stem (201) passes through the guide ring (5); the elastic element (3) is sleeved on the valve stem (201), one end of the elastic element (3) abuts against the adjusting assembly (2), and the other end abuts against the guide ring (5).

6. The pneumatic regulating valve according to claim 1, characterized in that, The valve stem (201) includes a head (2011) located at one end away from the first cavity (1021), and the diameter of the head (2011) gradually decreases along the direction away from the first cavity (1021).

7. The pneumatic regulating valve according to claim 6, characterized in that, The regulating component (2) is also provided with jet holes (205), a plurality of jet holes (205) are arranged circumferentially around the head (2011) and tilted towards the downstream direction of the gas passage (101), and the cooling passage (202) communicates with the jet holes (205).

8. An engine, characterized in that, Includes the pneumatic regulating valve according to any one of claims 1 to 7.

9. A method for controlling a regulating valve, characterized in that, The regulating valve control method uses the pneumatic regulating valve according to any one of claims 1 to 7, and the regulating valve control method includes: Adjust the pressure in the first chamber (1021) to adjust the throttling area of ​​the gas passage (101); Gas is ejected along the cooling channel (202) to cool the valve stem (201).

Images