Regulating valve, engine and rocket

Abstract

The invention relates to the technical field of rockets, in particular to a regulating valve, an engine and a rocket. The regulating valve comprises a first valve body and a second valve body, a fluid channel is formed in the first valve body, a first valve seat and a valve element are arranged in the fluid channel, a first grating structure is formed in the first valve seat, and a second grating structure is formed in the valve element; the driving mechanism is connected with the valve element and used for driving the second grating structure to move, and a flow channel with the overflowing area steplessly adjusted is formed between the second grating structure and the first grating structure. According to the regulating valve, the engine and the rocket, the driving mechanism drives the second grating structure to move, stepless regulation of the gas flow can be achieved, the regulation ratio of the regulating valve is increased, and therefore the requirement for precise control over the flow of a rocket propellant is met.

Description

Technical Field

[0001] The present invention relates to the field of rocket technology, and in particular to a regulating valve, an engine and a rocket. Background Art

[0002] When adjusting the thrust of a rocket engine, a gas regulating valve is often used in related technologies to adjust the thrust of the rocket engine. The outlet of the gas generator is connected to the turbine inlet and the gas regulating valve respectively. When the flow rate of the outlet of the gas generator is constant, the flow rate of the turbine is adjusted by adjusting the flow rate of the gas regulating valve to adjust the speed of the turbine, thereby finally adjusting the thrust of the engine.

[0003] However, in the related art, the gas regulating valve is mostly used to control the propellant flow, which can only achieve step adjustment through switching, and the adjustment ratio is low, and stepless adjustment cannot be achieved. However, in the process of engine thrust adjustment, the adjustment accuracy of the regulating valve is required to be high, so a gas regulating valve that can achieve stepless adjustment is needed. Summary of the invention

[0004] The present invention provides a regulating valve, an engine and a rocket, which are used to solve the defects of the prior art that a fuel gas regulating valve is used to control the propellant flow, the regulating ratio is low, and stepless regulation cannot be achieved.

[0005] The present invention provides a regulating valve, comprising: a first valve body, wherein a fluid passage is formed inside the first valve body, a first valve seat and a valve core are arranged in the fluid passage, a first grid structure is formed in the first valve seat, and a second grid structure is formed in the valve core; A driving mechanism is connected to the valve core and is used to drive the second grid structure to move, so that a flow channel with a stepless adjustment of the flow area is formed between the second grid structure and the first grid structure.

[0006] According to the regulating valve provided by the present invention, the valve body comprises: a first valve body and a second valve body, the first valve body is connected to the second valve body, the valve core is movably arranged between the first valve body and the second valve body, and the first valve seat is arranged inside the first valve body; A second valve seat is also provided in the fluid channel. The second valve seat is provided inside the second valve body. The second valve seat, the valve core and the first valve seat are sequentially connected along the fluid flow direction to form the flow channel.

[0007] The regulating valve provided by the present invention further includes: a first sealing structure and a second sealing structure; wherein, A first valve seat is provided in the first valve body, a second valve seat is provided in the second valve body, the first sealing structure is provided between the first valve seat and the inner wall of the first valve body, and the second sealing structure is provided between the second valve seat and the inner wall of the second valve body.

[0008] According to the regulating valve provided by the present invention, the first sealing structure comprises: a first sealing ring, the first sealing ring being arranged between the outer wall of the first valve seat and the inner wall of the first valve body; The second sealing structure includes: a second sealing ring, and the second sealing ring is arranged between the outer wall of the second valve seat and the inner wall of the second valve body.

[0009] According to the regulating valve provided by the present invention, the first sealing structure further comprises: a first gasket, a first elastic member and a first pressure ring, wherein the first gasket, the first elastic member and the first pressure ring are sequentially arranged along a direction from one end of the first sealing ring toward an end surface of the first valve seat; The second sealing structure further includes: a second gasket, a second elastic member and a second pressure ring, wherein the second gasket, the second elastic member and the second pressure ring are sequentially arranged along a direction from one end of the second sealing ring toward an end surface of the second valve seat.

[0010] The regulating valve provided by the present invention further comprises: a valve core bushing, a valve stem and a first connecting member, wherein the valve core bushing is arranged on the outer side of the valve core, the valve core bushing is connected to one end of the first connecting member, and the other end of the first connecting member is connected to the driving mechanism through the valve stem; wherein, An accommodating cavity is formed between the first valve body and the second valve body, and the valve core bushing is placed in the accommodating cavity and moves in the accommodating cavity.

[0011] According to the regulating valve provided by the present invention, an opening structure is formed on the valve core bushing, the first connecting piece is a T-shaped connecting piece, and the opening structure is clamped with one end of the T-shaped connecting piece.

[0012] The regulating valve provided according to the present invention also includes: a third sealing structure, which is arranged between the valve stem and the first valve body, and the third sealing structure includes: a packing assembly, a packing pressure ring and a packing pressure cover, and the packing assembly, the packing pressure ring and the packing pressure cover are arranged in sequence from the inside to the outside along the extension direction from the valve core to the valve stem.

[0013] The regulating valve provided by the present invention further includes: a sealing ring; wherein, The first valve body is provided with a mounting groove at a position where it is connected to the second valve body, and the sealing ring is arranged in the mounting groove.

[0014] The present invention also provides an engine, comprising: the regulating valve provided by the present invention.

[0015] The present invention also provides a rocket, comprising: the regulating valve provided by the present invention, or the engine provided by the present invention.

[0016] The present invention provides a regulating valve, comprising: a first valve body, a fluid channel formed inside the first valve body, a first valve seat and a valve core provided in the fluid channel, a first grid structure formed in the first valve seat, and a second grid structure formed in the valve core; a driving mechanism connected to the valve core, used to drive the second grid structure to move, and to form a flow channel with stepless adjustment of the flow area between the second grid structure and the first grid structure. The present invention provides a regulating valve, which can realize stepless adjustment of the gas flow by driving the second grid structure to move through the driving mechanism, and increases the adjustment ratio of the regulating valve, thereby meeting the need for precise control of the rocket propellant flow.

[0017] Furthermore, the present invention provides an engine, which includes the regulating valve in the above embodiment of the present invention, and therefore has the same advantages as above.

[0018] Furthermore, the present invention provides a rocket, which includes the regulating valve or engine in the above-mentioned embodiment of the present invention, and therefore has the same advantages as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of a regulating valve provided in one embodiment of the present invention.

[0021] Figure 2 It is a partial structural schematic diagram of a first sealing ring, a first gasket, a first elastic member and a first pressure ring provided in one embodiment of the present invention.

[0022] Figure 3 It is a schematic structural diagram of a first valve seat provided in one embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of a valve core provided in one embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of a valve core bushing provided in one embodiment of the present invention.

[0025] Reference numerals: 1: first sealing ring; 2: packing assembly; 3: second grid structure; 4: first valve body; 5: second valve body; 6: first valve seat; 7: valve core; 8: valve core bushing; 81: opening structure; 9: valve stem; 10: first connecting piece; 11: bracket; 12: second connecting piece; 13: packing gland; 14: second valve seat; 15: first elastic piece; 16: thermal insulation pad; 17: pin shaft; 18: first pressure ring; 19: packing pressure ring; 20: first gasket; 21: first grid structure; 22: sealing ring; 23: driving mechanism; 25: first screw; 26: second screw; 27: nut; 28: latch. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present embodiment.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this embodiment, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In this embodiment, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] Combine the following Figures 1 to 5 The present invention describes a regulating valve, which includes a first valve body 4 and a driving mechanism 23 .

[0032] Among them, a fluid channel is formed inside the first valve body 4, and a first valve seat 6 and a valve core 7 are provided in the fluid channel. A first grid structure 21 is formed in the first valve seat 6, and a second grid structure 3 is formed in the valve core 7; a driving mechanism 23 is connected to the valve core 7, and is used to drive the second grid structure 3 to move, so that a flow channel with stepless adjustment of the flow area is formed between the second grid structure 3 and the first grid structure 21.

[0033] Specifically, the interior of the first valve body 4 is a hollow structure for forming a fluid channel for gas or the like to pass through, and a first valve seat 6 and a valve core 7 are arranged in the fluid channel, wherein the first valve seat 6 is fixed inside the first valve body 4, and the valve core 7 is movably arranged inside the first valve body 4, and the power provided by the driving mechanism 23 enables the valve core 7 to move in a plane perpendicular to the straight line where the fluid channel is located.

[0034] A first grid structure 21 is machined in the first valve seat 6, and a second grid structure 3 is machined in the valve core 7. Since the first valve seat 6 is fixed, the first grid structure 21 is also fixed, and the valve core 7 can be moved by the driving mechanism 23, and the second grid structure 3 moves synchronously with the valve core 7. During the movement, the first grid structure 21 and the second grid structure 3 form different shielding relationships. Through the shielding relationship between the two, a flow channel for conveying gas with a flow area that can be steplessly adjusted is formed.

[0035] It can be understood that the first grid structure 21 and the second grid structure 3 are both composed of blocks and channels arranged alternately, the first grid structure 21 has a first channel for the gas to pass through, and the second grid structure 3 has a second channel for the gas to pass through.

[0036] In the specific implementation of the present invention, when the driving mechanism 23 drives the valve core 7 to move, there are at least two limit states: When the second flow channel is completely blocked by the block in the first grid structure 21, that is, Figure 1 In the structure shown, in this state, the regulating valve is completely closed and the gas cannot pass through; When the second flow channel completely overlaps with the first flow channel, in this state, the regulating valve is in a fully open state, and the gas flow in the regulating valve is maximum.

[0037] During the adjustment process of the above two states, the position of the second grid structure 3 is adjusted by the driving mechanism 23 so that the blocking relationship between it and the first grid structure 21 is adjustable, and the overlapping area of ​​the first flow channel and the second flow channel is the flow area of ​​the valve body.

[0038] Optionally, the driving mechanism 23 drives the valve core 7 to move in a direction perpendicular to the direction of the fluid channel, so as to ensure that the gas flow rate can be adjusted through the blocking relationship between the block and the flow channel in the first grid structure 21 and the second grid structure 3 .

[0039] Optionally, the driving mechanism 23 may adopt an external motor, a cylinder or an oil cylinder, etc. In this embodiment, an electric actuator is adopted.

[0040] It can be seen that the regulating valve provided by the present invention comprises: a first valve body 4, a fluid channel is formed inside the first valve body 4, a first valve seat 6 and a valve core 7 are provided in the fluid channel, a first grid structure 21 is formed in the first valve seat 6, and a second grid structure 3 is formed in the valve core 7; a driving mechanism 23 is connected to the valve core 7, and is used to drive the second grid structure 3 to move, so that a flow channel with stepless adjustment of the flow area is formed between the second grid structure 3 and the first grid structure 21. The regulating valve provided by the present invention can realize stepless adjustment of the gas flow rate by driving the second grid structure 3 to move through the driving mechanism 23, thereby increasing the adjustment ratio of the regulating valve, thereby meeting the need for precise control of the rocket propellant flow rate.

[0041] In one embodiment of the present invention, the regulating valve further includes: a second valve body 5. The first valve body 4 is connected to the second valve body 5, and the valve core 7 is movably disposed between the first valve body 4 and the second valve body 5, and the first valve seat 6 is disposed inside the first valve body 4. A second valve seat 14 is also disposed in the fluid passage, and the second valve seat 14 is disposed inside the second valve body 5. The second valve seat 14, the valve core 7 and the first valve seat 6 are sequentially connected along the fluid flow direction to form a flow channel, that is, the second valve seat 14 and the first valve seat 6 are respectively located on the left and right sides of the valve core 7. Specifically, if Figure 1 In the structure shown, the first valve body 4 is the right valve body, the second valve body 5 is the left valve body, and the valve core 7 is the middle valve core, which can move up and down under the drive of the driving mechanism 23 .

[0042] In one embodiment of the present invention, the valve body is made of a high-temperature alloy material, and the valve core structure can be made of a metal ceramic or hard alloy material with high temperature resistance, wear resistance, and erosion resistance, so that it can be used normally for a long time in an environment of high temperature, high pressure, high speed, and solid particle medium. Since the existing regulating valve changes from normal temperature in the assembly state to high temperature in the working state, the difference in expansion coefficients of different parts materials will cause the parts fitting clearance to increase, causing the valve to produce a return clearance, affecting the movement accuracy. In this embodiment, the second valve seat 14, the valve core 7, and the first valve seat 6 are preferably made of a high-temperature alloy matrix sprayed with zirconium oxide or chromium carbide, which is wear-resistant and erosion-resistant, and the matrix has good toughness and can withstand tension. The valve core 7 and the valve core bushing 8 are made of the same material or the two are an integrated structure, so there is no problem of the fitting clearance becoming larger after high temperature, and it has the advantages of small return clearance and high movement accuracy.

[0043] In one embodiment of the present invention, the regulating valve further includes: a first sealing structure and a second sealing structure. The first sealing structure is arranged between the first valve seat 6 and the inner wall of the first valve body 4, and the second sealing structure is arranged between the second valve seat 14 and the inner wall of the second valve body 5. Specifically, corresponding valve seats are arranged inside the first valve body 4 and the second valve body 5, and sealing structures are arranged between the outer wall of the valve seat and the inner wall of the valve body, so as to ensure the sealing of the valve body and avoid the danger of gas leakage.

[0044] In one embodiment of the present invention, the first sealing structure includes: a first sealing ring 1, which is arranged between the outer wall of the first valve seat 6 and the inner wall of the first valve body 4; the second sealing structure includes: a second sealing ring, which is arranged between the outer wall of the second valve seat 14 and the inner wall of the second valve body 5. Specifically, the two sealing structures mentioned above respectively include sealing rings, and the gap between the outer wall of the valve seat and the inner wall of the valve body is sealed by the sealing rings, thereby improving the air tightness of the inlet valve seat and the outlet valve seat of the valve body. Figure 2As shown, a partial schematic diagram of the first sealing ring 1 is provided. Similarly, the second sealing ring has a similar structure, but is arranged in a different position, so it will not be described in detail.

[0045] In one embodiment of the present invention, the first sealing structure also includes: a first gasket 20, a first elastic member 15 and a first pressure ring 18, and the first gasket 20, the first elastic member 15 and the first pressure ring 18 are arranged in sequence along the direction of one end of the first sealing ring 1 toward the end face of the first valve seat 6; the second sealing structure also includes: a second gasket, a second elastic member and a second pressure ring, and the second gasket, the second elastic member and the second pressure ring are arranged in sequence along the direction of one end of the second sealing ring toward the end face of the second valve seat 14.

[0046] Due to the size of the sealing ring, there may be a gap between the end of the sealing ring and the end face of the valve seat. In this embodiment, the gasket, elastic member and pressure ring are provided to not only provide a pre-tightening force for the radial sealing of the sealing ring, but also seal the end of the sealing ring and the end face of the valve seat. Specifically, the elastic member can be a disc spring, which squeezes the gasket and the pressure ring, the pressure ring presses the sealing ring, and the gasket presses the valve seat, thereby improving the sealing performance between the sealing ring and the valve seat. Figure 2 As shown, a partial schematic diagram of the first gasket 20, the first elastic member 15 and the first pressure ring 18 is provided. Similarly, the second gasket, the second elastic member and the second pressure ring are similar to the above structure, but the arrangement positions are different, so they will not be repeated.

[0047] In one embodiment of the present invention, the regulating valve further includes: a valve core bushing 8, a valve stem 9 and a first connecting member 10, the valve core bushing 8 is arranged on the outside of the valve core 7, the valve core bushing 8 is connected to one end of the first connecting member 10, and the other end of the first connecting member 10 is connected to the driving mechanism 23 through the valve stem 9. An accommodating cavity is formed between the first valve body 4 and the second valve body 5, and the valve core bushing 8 is placed in the accommodating cavity and moves in the accommodating cavity. Specifically, the second valve stem 9 is inserted into the first valve body 4, and the driving mechanism 23 drives the valve core 7 to move up and down through the valve stem 9, the first connecting member 10, and the valve core bushing 8. In this embodiment, the valve core bushing 8 is arranged on the outside of the valve core. If the valve core is made of ceramic or hard alloy as a whole, it cannot directly withstand the tensile force, and the force needs to be transmitted through the valve core bushing 8, so that the valve core can move in both the upward and downward directions without any problem. Therefore, an accommodating cavity for accommodating the valve core bushing 8 is provided between the left valve body and the right valve body. The valve core bushing 8 is provided around the valve core 7 and placed in the accommodating cavity. The valve core bushing 8 is then connected to the valve stem 9, and the valve stem 9 is connected to the external motor. While controlling the up and down movement of the valve core 7, the connection structure of the valve core and the external motor can be protected.

[0048] In one embodiment of the present invention, an opening structure 81 is formed on the valve core bushing 8, and the first connector 10 is a T-shaped connector, and the opening structure 81 is clamped with one end of the T-shaped connector. Figure 5 As shown, the head of the T-type connector is larger than its tail, and its tail is connected to the valve stem 9, and its head is clamped in the opening structure 81 on the valve core bushing 8, so as to realize the stable connection between the T-type connector and the valve core bushing 8. Of course, other structures can also be set, for example, the lower end of the valve stem 9 is provided with an "Ω"-shaped structure, and the valve core bushing 8 is provided with a matching ball head structure. Through the assembly of the ball head structure and the "Ω"-shaped structure, the above-mentioned T-type connector can be replaced, and the requirements of fixed connection and up and down movement can also be realized.

[0049] In one embodiment of the present invention, the regulating valve further includes: a third sealing structure, which is arranged between the valve stem 9 and the first valve body 4, and includes: a packing assembly 2, a packing pressure ring 19 and a packing gland 13, and the packing assembly 2, the packing pressure ring 19 and the packing gland 13 are arranged in sequence from the inside to the outside along the extension direction from the valve core 7 to the valve stem 9. In this embodiment, a third sealing structure is arranged between the valve stem 9 and the valve body to prevent the valve stem 9 from leaking gas from the gap between the valve stem 9 and the first valve body 4 during movement. Specifically, the third sealing structure includes a packing assembly 2, a packing pressure ring 19 and a packing gland 13, and a packing assembly 2 is filled between the valve stem 9 and the first valve body 4 for sealing, and a packing pressure ring 19 and a packing gland 13 are arranged in sequence on the packing assembly 2 to provide a tight sealing force.

[0050] In one embodiment of the present invention, it further comprises: a sealing ring 22; wherein the first valve body 4 is provided with a mounting groove at the position where it is connected to the second valve body 5, and the sealing ring 22 is arranged in the mounting groove. Preferably, the sealing ring 22 can be a graphite ring, and the first valve body 4 is provided with an annular mounting groove, and the annular graphite ring is fixed in the annular mounting groove to ensure the sealing performance between the first valve body 4 and the second valve body 5.

[0051] In one embodiment of the present invention, the first valve body 4 and the second valve body 5 are fixedly connected by a first screw 25, a bracket 11 is provided between the first valve body 4 and the driving mechanism 23, and a heat insulation pad 16 is provided between the bracket 11 and the upper end surface of the first valve body 4 to prevent heat from being transferred to the driving mechanism 23 and causing damage to the driving mechanism 23, and the driving mechanism 23, the bracket 11, the heat insulation pad 16 and the first valve body 4 are fixedly connected by a second screw 26. The fixed bracket 11 is a square frame structure.

[0052] In one embodiment of the present invention, the driving mechanism 23 is connected to the valve stem 9 through the pin 17 and the second connecting member 12. The pin 17 and the output shaft of the driving mechanism 23 are prevented from coming out by a latch 28. The second connecting member 12 and the valve stem 9 are engaged and connected by a nut 27. The purpose of the nut 27 is that due to the influence of tolerance, the valve stem 9 and the second connecting member 12 cannot be directly screwed together, and the depth of the screwing of the two needs to be adjustable. Therefore, the two are loosely connected, and the thread gap between the two needs to be eliminated by tightening the nut.

[0053] The present invention further provides an engine, which comprises: the regulating valve in the above embodiment of the present invention.

[0054] The present invention provides an engine, which includes the regulating valve in the above embodiment of the present invention, and therefore has the same advantages as above.

[0055] The present invention further provides a rocket, which comprises: the regulating valve in the above embodiment of the present invention, or the engine in the above embodiment of the present invention.

[0056] The present invention provides a rocket, which includes the regulating valve or engine in the above-mentioned embodiment of the present invention, and therefore has the same advantages as above.

[0057] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed over multiple units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those of ordinary skill in the art may understand and implement the present invention without creative effort.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A regulating valve, characterized in that: include: A first valve body (4), wherein a fluid passage is formed inside the first valve body (4), a first valve seat (6) and a valve core (7) are provided in the fluid passage, a first grid structure (21) is formed in the first valve seat (6), and a second grid structure (3) is formed in the valve core (7); A driving mechanism (23), the driving mechanism (23) being connected to the valve core (7) and used for driving the second grid structure (3) to move, so that a flow channel with a steplessly adjustable flow area is formed between the second grid structure (3) and the first grid structure (21).

2. The regulating valve according to claim 1, characterized in that: Also includes: a second valve body (5), the first valve body (4) being connected to the second valve body (5), the valve core (7) being movably arranged between the first valve body (4) and the second valve body (5), and the first valve seat (6) being arranged inside the first valve body (4); A second valve seat (14) is also provided in the fluid channel. The second valve seat (14) is provided inside the second valve body (5). The second valve seat (14), the valve core (7) and the first valve seat (6) are connected in sequence along the fluid flow direction to form the flow channel.

3. The regulating valve according to claim 2, characterized in that: Also includes: A first sealing structure and a second sealing structure; wherein, The first sealing structure is provided between the first valve seat (6) and the inner wall of the first valve body (4), and the second sealing structure is provided between the second valve seat (14) and the inner wall of the second valve body (5).

4. The regulating valve according to claim 3, characterized in that: The first sealing structure comprises: a first sealing ring (1), the first sealing ring (1) being arranged between an outer wall of the first valve seat (6) and an inner wall of the first valve body (4); The second sealing structure comprises: a second sealing ring, wherein the second sealing ring is arranged between the outer wall of the second valve seat (14) and the inner wall of the second valve body (5).

5. The regulating valve according to claim 4, characterized in that: The first sealing structure further comprises: a first gasket (20), a first elastic member (15) and a first pressure ring, wherein the first gasket (20), the first elastic member (15) and the first pressure ring are arranged in sequence along a direction from one end of the first sealing ring (1) toward an end surface of the first valve seat (6); The second sealing structure further comprises: a second gasket, a second elastic member and a second pressure ring, wherein the second gasket, the second elastic member and the second pressure ring are arranged in sequence along a direction from one end of the second sealing ring toward the end surface of the second valve seat (14).

6. The regulating valve according to claim 2, characterized in that: Also includes: A valve core bushing (8), a valve stem (9) and a first connecting member (10), wherein the valve core bushing (8) is arranged on the outside of the valve core (7), the valve core bushing (8) is connected to one end of the first connecting member (10), and the other end of the first connecting member (10) is connected to the driving mechanism (23) via the valve stem (9); wherein: An accommodating cavity is formed between the first valve body (4) and the second valve body (5), and the valve core bushing (8) is placed in the accommodating cavity and moves in the accommodating cavity.

7. The regulating valve according to claim 6, characterized in that: An opening structure (81) is formed on the valve core bushing (8), the first connecting piece (10) is a T-shaped connecting piece, and the opening structure (81) is clamped to one end of the T-shaped connecting piece.

8. The regulating valve according to claim 6, characterized in that: Also includes: A third sealing structure, the third sealing structure is arranged between the valve stem (9) and the first valve body (4), the third sealing structure comprises: a packing assembly (2), a packing pressure ring (19) and a packing pressure cover (13), the packing assembly (2), the packing pressure ring (19) and the packing pressure cover (13) are arranged in sequence from the inside to the outside along the extension direction from the valve core (7) to the valve stem (9).

9. The regulating valve according to any one of claims 2 to 8, characterized in that: Also includes: Sealing ring (22); wherein, The first valve body (4) is provided with a mounting groove at a position where it is connected to the second valve body (5), and the sealing ring (22) is arranged in the mounting groove.

10. An engine, characterized in that: include: A regulating valve as claimed in any one of claims 1 to 9.

11. A rocket, characterized in that: include: The regulating valve according to any one of claims 1 to 9, or, The engine of claim 10.

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