High temperature and high pressure control valve with adaptive labyrinth flow channel structure

Abstract

The present invention discloses a high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure, which relates to the technical field of regulating valves. On the basis of a conventional labyrinth structure regulating valve, a labyrinth sleeve composed of a plurality of labyrinth layers is optimized and improved. On the one hand, the medium flow groove therein is utilized to actively change the flow mode of the medium fluid, control the fluid flow rate and reduce the cavitation problem caused by the liquid medium, and reduce the operating noise. On the other hand, the operation process of the labyrinth sleeve and the valve block is synchronous, and the labyrinth sleeve freely "fluctuates" according to the opening of the valve block. Its essence lies in: under the influence of high-pressure medium, the pressure of the medium itself directly acts on the plurality of labyrinth layers, so that the gap of the labyrinth layers can be freely adjusted in a small range. On the basis of not affecting the flow of the medium, the influence of medium erosion on the valve body is reduced in the two forms of "active pressure relief" and "passive movement".

Description

Technical Field

[0001] The invention relates to the technical field of regulating valves, and in particular to a high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure. Background Art

[0002] For control valves used for high-temperature / high-pressure fluids or high-pressure differential fluids, under high-temperature and high-pressure conditions, the fluid flow rate is high, which can easily cause erosion and corrosion inside the throttling components of the control valve. At the same time, cavitation, noise and vibration caused by cavitation may also occur, posing certain safety hazards.

[0003] At present, high-pressure regulating valves are classified according to the form of valve internals: multi-stage high-pressure regulating valves, labyrinth high-pressure regulating valves and single-seat sleeve load high-pressure regulating valves, etc. However, the current high-pressure regulating valves cannot effectively avoid the coexistence of cavitation and erosion, and have a short lifespan. The main reasons are: erosion is the main contradiction when working with a small opening, and cavitation is the main contradiction when working with a large opening.

[0004] This application proposes a solution to this problem. Summary of the invention

[0005] The purpose of the present invention is to provide a high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure. For the current regulating valves used for high-temperature / high-pressure or high-pressure difference fluids, the internal components cannot avoid the simultaneous existence of cavitation and erosion during the high-speed fluid flow process.

[0006] The object of the present invention can be achieved by the following technical solutions: a high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure, comprising a valve body, a drive assembly, and a central flow channel opened inside the valve body, wherein a labyrinth sleeve is arranged in an internal position of the valve body corresponding to the middle position of the central flow channel, a valve stem is installed at the output end position of the drive assembly, the valve stem penetrates into the interior of the valve body, and a valve block is installed at the end position of the valve stem, and the valve block is located in the internal position of the labyrinth sleeve;

[0007] The labyrinth sleeve is composed of an upper cooperating sleeve, a labyrinth layer and a lower fixed sleeve. The upper cooperating sleeve and the lower fixed sleeve are arranged in sequence from top to bottom. The labyrinth layer is located in the middle position between the upper cooperating sleeve and the lower fixed sleeve and is linearly equidistantly arranged in the vertical direction. Medium flow grooves are opened on the upper and lower surfaces of the labyrinth layer, and the medium flow grooves are arranged in a circular array along the center point of the labyrinth sleeve.

[0008] It is further configured that: the inner diameter of the labyrinth sleeve is equal to the outer diameter of the valve block.

[0009] It is further configured as follows: the lower fixed sleeve is fixedly connected to the position of the corresponding central flow channel of the valve body, and a vertically arranged directional slide rod is installed on the lower fixed sleeve, and the directional slide rod passes through the labyrinth layer and the upper cooperative sleeve in sequence upward.

[0010] It is further configured as follows: the directional slide bar is slidably connected to the labyrinth layer and the upper cooperative sleeve, and a connecting spring is provided at an outer position between the labyrinth layer at the upper position of the directional slide bar and the upper cooperative sleeve.

[0011] It is further configured as follows: a cooperative sleeve plate is installed on the position of the valve stem corresponding to the upper side of the labyrinth sleeve, and a plurality of pillars corresponding to the upper cooperative sleeve plate are installed on the lower surface of the cooperative sleeve plate.

[0012] It is further configured as follows: the medium flow grooves that fit each other in the labyrinth sheets between two adjacent positions form a medium flow channel, and the medium flow grooves are in a multi-directional right-angle bending state along the diameter direction of the labyrinth sheet.

[0013] It is further configured that: the end position of the medium flow channel corresponding to the labyrinth sleeve close to the inner curved surface of the valve block is configured as a front-valve inlet or a rear-valve outlet.

[0014] It is further configured that: the medium flow channel is configured with the following three configuration states through the medium flow slot:

[0015] State 1: the groove surface of the medium flow groove is kept horizontal with the horizontal plane;

[0016] State 2: The cross section of the medium flow slot located on the upper surface of the labyrinth layer is in an upwardly curved arched state, and the cross section of the medium flow slot located on the lower surface of the labyrinth layer is in a downwardly curved arched state;

[0017] State three: the groove surface of the medium flow groove is inclined upward or downward along the diameter direction of the labyrinth layer.

[0018] The present invention has the following beneficial effects:

[0019] 1. Improvements are made to the conventional labyrinth control valve structure. On the basis of the labyrinth sleeve, the labyrinth layers inside the valve are improved and optimized. When the medium flows inside the valve body, the medium is "cut" into multiple parallel thin flows by the medium flow groove. The parallel thin flows form repeated right-angle turns. Multiple labyrinth layers with the flow channels are overlapped to form a sleeve. By changing the internal structure of the labyrinth sleeve, the flow rate of the fluid flowing through the valve trim is controlled, the cavitation caused by liquid cavitation is reduced, and the gas noise is reduced, which can effectively prolong the life of the control valve and ensure its performance;

[0020] 2. Combined with the above technical content, it is explained again that: based on the labyrinth sleeve in this document, the labyrinth layers therein can have a small range of movement ability compared with the conventional structure. Its essence is to be synchronized with the movement process of the valve block. The movement ability of each labyrinth layer is directly related to the opening of the valve block and the medium pressure. Its essence lies in: under the influence of high-pressure medium, the pressure of the medium itself directly acts on multiple labyrinth layers, so that the gap of the labyrinth layers can be freely adjusted in a small range. On the basis of not affecting the flow of the medium, the influence of medium erosion on the valve body is reduced through "active pressure relief" and "passive movement", and the groove surface shape of each medium flow groove is further improved and optimized, so as to better adapt to high-pressure fluids. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only 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.

[0022] Figure 1 This is a structural schematic diagram of a high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure proposed by the present invention;

[0023] Figure 2 The invention provides a high temperature and high pressure regulating valve with an adaptive labyrinth flow channel structure. Figure 1 A cross-sectional view of

[0024] Figure 3 The invention provides a high temperature and high pressure regulating valve with an adaptive labyrinth flow channel structure. Figure 1 sectional view of

[0025] Figure 4 This is a disassembled diagram of a labyrinth sleeve assembly in a high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure proposed by the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of a labyrinth sleeve in a high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure proposed by the present invention;

[0027] Figure 6 A schematic diagram of the structure of a labyrinth layer in a high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure proposed by the present invention;

[0028] Figure 7 The invention provides a high temperature and high pressure regulating valve with an adaptive labyrinth flow channel structure. Figure 6 A top view of

[0029] Figure 8 The invention provides a high temperature and high pressure regulating valve with an adaptive labyrinth flow channel structure. Figure 6 A partial cutaway view of

[0030] Fig. 9 The invention provides a high temperature and high pressure regulating valve with an adaptive labyrinth flow channel structure. Figure 6 A partial cross-sectional view of .

[0031] In the figure: 1. valve body; 2. drive assembly; 3. central flow channel; 4. cooperative sleeve; 5. valve stem; 6. valve block; 7. labyrinth sleeve; 701. upper cooperative sleeve; 702. labyrinth layer; 703. lower fixed sleeve; 704. directional slide rod; 705. connecting spring; 8. medium flow groove. DETAILED DESCRIPTION

[0032] The technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0033] Embodiment 1:

[0034] At present, high-pressure regulating valves are classified into the following types according to the valve internal parts: multi-stage high-pressure regulating valves, labyrinth high-pressure regulating valves and single-seat sleeve load high-pressure regulating valves. However, the current high-pressure regulating valves cannot effectively avoid cavitation and high-speed high-erosion phenomena, and have a short lifespan. The main reasons are: erosion is the main contradiction when working with a small opening, and cavitation is the main contradiction when working with a large opening. At present, the solution to this problem involves the internal structure of the regulating valve, which is the key. The following technical solutions are proposed:

[0035] Reference Figures 1 to 9 The high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure in this embodiment includes a valve body 1, a drive assembly 2, and a central flow channel 3 opened inside the valve body 1. A labyrinth sleeve 7 is arranged in the internal position of the valve body 1 corresponding to the middle position of the central flow channel 3. A valve stem 5 is installed at the output end of the drive assembly 2. The valve stem 5 penetrates into the interior of the valve body 1 and a valve block 6 is installed at the end of the valve stem 5. The valve block 6 is located in the internal position of the labyrinth sleeve 7.

[0036] The labyrinth sleeve 7 is composed of an upper cooperative sleeve 701, a labyrinth layer 702 and a lower fixed sleeve 703. The upper cooperative sleeve 701 and the lower fixed sleeve 703 are arranged in sequence from top to bottom. The labyrinth layer 702 is located in the middle position of the upper cooperative sleeve 701 and the lower fixed sleeve 703 and is linearly equidistantly arranged along the vertical direction. Medium flow grooves 8 are opened on the upper and lower surface positions of the labyrinth layer 702. The medium flow grooves 8 are arranged in a circular array along the center point of the labyrinth sleeve 7. The inner diameter of the labyrinth sleeve 7 is equal to the outer diameter of the valve block 6. The medium flow grooves 8 that fit each other in the labyrinth layer 702 between two adjacent positions form a medium flow channel. The medium flow grooves 8 are in a multi-directional right-angle bending state along the diameter direction of the labyrinth layer 702.

[0037] Basic principle: The operation process of the overall structure is consistent with the principle of conventional regulating valves: the valve block 6 is driven up and down by the driving component 2, and the valve block 6 corresponds to the labyrinth sleeve 7, so that the opening of the central flow channel 3 corresponding to the labyrinth sleeve 7 is changed by the valve block 6, and combined with Figure 4 and Figure 5 To illustrate: when the valve block 6 is located at the lowest position of the labyrinth sleeve 7, the central flow channel 3 is in a closed state. When the valve block 6 moves upward, the medium flow slots 8 in one or more labyrinth layers 702 are opened.

[0038] In this process, reference Figure 6 and Figure 7 When the medium flows through the medium flow groove 8, the medium is affected by the structural shape of the medium flow groove 8. Because there are multiple right-angle bends in the medium flow groove 8, the medium is divided into multiple parallel thin streams, and the parallel thin streams form repeated right-angle turns. Multiple labyrinth layers 702 with the flow path are overlapped to form a labyrinth sleeve 7. By changing the internal structure of the labyrinth sleeve 7, the flow rate of the medium flowing through the valve trim is restricted, the cavitation of the liquid is reduced, and the gas noise is reduced, which can effectively prolong the life of the regulating valve and ensure its performance.

[0039] Embodiment 2:

[0040] This embodiment is an improvement on the overall structure of the labyrinth sleeve in the first embodiment:

[0041] The lower fixed sleeve 703 is fixedly connected to the position of the valve body 1 corresponding to the central flow channel 3, and a vertically arranged directional slide rod 704 is installed on the lower fixed sleeve 703. The directional slide rod 704 passes through the labyrinth layer 702 and the upper cooperative sleeve 701 upward in sequence. The directional slide rod 704 is slidably connected to the labyrinth layer 702 and the upper cooperative sleeve 701, and a connecting spring 705 is arranged at an external position between the labyrinth layer 702 at the upper position of the directional slide rod 704 and the upper cooperative sleeve 701. A cooperative sleeve plate 4 is installed at a position on the upper side of the valve stem 5 corresponding to the labyrinth sleeve 7, and a plurality of pillars corresponding to the upper cooperative sleeve 701 are installed on the lower surface of the cooperative sleeve plate 4.

[0042] Solution Description: Combined Figure 2 Explanation: In the initial state, the driving assembly 2 drives the valve block 6 to move downward so that the entire labyrinth sleeve 7 is in a state of being completely blocked. It should be noted that the cooperative sleeve 4 and the valve stem 5 are in a synchronous operation state, so that the upper cooperative sleeve 701 is driven downward by the cooperative sleeve 4, and each connecting spring 705 is in a compressed state. The purpose is to make each labyrinth layer 702 be completely squeezed close. On the contrary, when the valve block 6 moves up to "open" the central flow channel 3, because the connecting spring 705 is in a released state, each labyrinth layer 702 is not in a state of being completely squeezed close. Its essence is that under the action of the medium's own pressure, the labyrinth layer 702 in the corresponding position is in a state of being moved upward "freely fluctuating", which can be understood as: the distance between the labyrinth layers 702 in each two adjacent positions fluctuates, so the volume of the medium flow channel changes.

[0043] Embodiment three:

[0044] This embodiment is a supplementary description of the first and second embodiments, specifically focusing on the medium flow troughs therein:

[0045] The medium flow channel corresponds to the labyrinth sleeve 7, and one end of the labyrinth sleeve 7 close to the inner curved surface of the valve block 6 is set as the valve front inlet or the valve rear outlet. The medium flow channel is set in the following three settings through the medium flow groove 8:

[0046] State 1: the groove surface of the medium flow groove 8 is kept horizontal with the horizontal plane;

[0047] State 2: The cross section of the medium flow slot 8 located on the upper surface of the labyrinth layer 702 is in an upwardly curved arched state, and the cross section of the medium flow slot 8 located on the lower surface of the labyrinth layer 702 is in a downwardly curved arched state;

[0048] State three: the groove surface of the medium flow groove 8 is inclined upward or downward along the diameter direction of the labyrinth layer 702 .

[0049] The following description is made in combination with Embodiment 1 and Embodiment 2:

[0050] S1: Each labyrinth layer 702 is numbered as i in order from bottom to top. When the overall regulating valve is in a small opening state, it means that 5 or less medium flow slots 8 in the labyrinth layer 702 are in an open state; on the contrary, when the overall regulating valve is in a large opening state, it can be represented that more than 5 medium flow slots 8 in the labyrinth layer 702 are in an open state.

[0051] S2: Combined with S1, explanation: if the thickness of the labyrinth sheet 702 is L, when the valve block 6 moves up by i*L, it can be said that the multiple labyrinth sheets 702 can move freely within the height range of i*L. However, it should be noted that no matter how the labyrinth sheets 702 move freely, only the medium flow slots 8 in the lower i labyrinth sheets 702 in the entire labyrinth sleeve 7 are in an open state, while the multiple labyrinth sheets 702 at the upper side are still in a blocked state;

[0052] Its key purpose is: it is mainly used for fluids such as high-pressure media. The high pressure of the fluid itself drives the i labyrinth sheets 702 at the lower position to move upward. In theory, the i labyrinth sheets 702 are all pushed upward. It can be understood that: the distance between the labyrinth sheet 702 No. 1 and the lower fixed sleeve 703 is the largest, but on the one hand, it is affected by the elasticity of the connecting spring 705, and on the other hand, the groove surface structure of the medium flow groove 8 allows the i labyrinth sheets 702 to move freely in the vertical direction to change the maximum volume of the medium flow groove;

[0053] S3: This is explained by combining S1 and S2: Under normal conditions, the groove surface of the medium flow groove 8 can be kept horizontal, so that the medium will only be divided into multiple thin streams when flowing through the medium flow channel. This part corresponds to the above-mentioned state 1;

[0054] However, considering the free movement process of the labyrinth layer 702 in the vertical direction, the groove surface of the medium flow groove 8 can be improved into state two and state three. The essence of state two is that the cross section of the groove surface of the medium flow groove 8 located on the upper surface of the labyrinth layer 702 is in an upward curved arch state, and the cross section of the groove surface of the medium flow groove 8 located on the lower surface of the labyrinth layer 702 is in a downward curved arch state. Then, in the medium flow channel formed when the two labyrinth layers 702 are completely close, the flow channel diameter in the middle part is smaller than the flow channel diameter at the two end positions, so that the flow velocity is further changed mainly by changing the diameter, which is further coordinated with the free movement process of the labyrinth layer 702.

[0055] As for state three, its essence is to change the diameters at both ends of the medium flow channel, specifically to change the inclination direction of the groove surface in the medium flow groove 8, such as making the diameter of one end of the medium flow channel close to the valve block 6 larger and the diameter of the other end smaller, in order to match the flow direction of the fluid in the central flow channel 3, so as to Figure 2 It can be understood that the fluid can diffuse to the outside through the center of the labyrinth sleeve 7, and vice versa, it can diffuse to the center through the outside of the labyrinth sleeve 7, and the adjustment requirements of different fluids can be met;

[0056] If the fluid is water or non-compressible liquid and needs to be high in and low out, the fluid will first pass through a large-diameter port to reduce pressure or speed, which can reduce the scouring of the valve core.

[0057] If the fluid is a compressible liquid such as steam or gas and needs to be low inlet and high outlet, the purpose of this consideration is because the fluid is a compressible fluid; and the pressure before the valve is greater than the pressure after the valve, so the fluid density before the valve is greater than the fluid density after the valve. Although the labyrinth sleeve 7 is an expansion flow channel, the combined influence causes the fluid flow rate entering the labyrinth sleeve 7 to be less than the fluid flow rate after exiting the labyrinth sleeve 7, which is exactly the opposite of incompressible fluid. Therefore, in order to reduce the scouring of the valve core, the groove surface of the medium flow groove 8 can be further improved.

[0058] In combination with the above-mentioned S3 content, the groove surface design structure of the medium flow groove 8 needs to be combined with the regulation requirements of the fluid, specifically including the above-mentioned state two and state three. Due to the regulation requirements of the fluid itself, the groove surface structure of the above-mentioned medium flow groove 8 is not directly limited in the present invention, and only includes the above-mentioned state one, state two and state three.

[0059] In summary: On the basis of the conventional labyrinth structure regulating valve, the labyrinth sleeve composed of multiple labyrinth layers is optimized and improved. On the one hand, the medium flow groove is used to actively change the flow mode of the medium fluid, control the fluid flow rate, thereby reducing the cavitation problem caused by the liquid medium and reducing the operating noise. On the other hand, the operation process of the labyrinth sleeve and the valve block is synchronous, and the labyrinth sleeve "fluctuates" freely according to the opening of the valve block. Its essence lies in: under the influence of high-pressure medium, the pressure of the medium itself directly acts on multiple labyrinth layers, so that the labyrinth layers can freely adjust the gap in a small range. On the basis of not affecting the flow of the medium, the influence of medium erosion on the valve body is reduced through "active pressure relief" and "passive movement".

[0060] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-temperature and high-pressure regulating valve with an adaptive labyrinth flow channel structure, comprising a valve body (1), a drive assembly (2), and a central flow channel (3) provided inside the valve body (1), characterized in that: A labyrinth sleeve (7) is arranged in an internal position of the valve body (1) corresponding to the middle position of the central flow channel (3); a valve stem (5) is installed at the output end of the drive assembly (2); the valve stem (5) penetrates into the interior of the valve body (1) and a valve block (6) is installed at the end of the valve stem (5); the valve block (6) is located in an internal position of the labyrinth sleeve (7); The labyrinth sleeve (7) is composed of an upper cooperative sleeve (701), a labyrinth layer (702) and a lower fixed sleeve (703), wherein the upper cooperative sleeve (701) and the lower fixed sleeve (703) are arranged in sequence from top to bottom, the labyrinth layer (702) is located in the middle of the upper cooperative sleeve (701) and the lower fixed sleeve (703) and is linearly equidistantly arranged in the vertical direction, and medium flow grooves (8) are provided on the upper and lower surfaces of the labyrinth layer (702), and the medium flow grooves (8) are arranged in a ring array along the center point of the labyrinth sleeve (7); The lower fixed sleeve (703) is fixedly connected to the position of the valve body (1) corresponding to the central flow channel (3), and a directional sliding rod (704) arranged vertically is installed on the lower fixed sleeve (703). The directional sliding rod (704) passes through the labyrinth layer (702) and the upper cooperative sleeve (701) in sequence upwards. The directional sliding rod (704) is slidably connected to the labyrinth layer (702) and the upper cooperative sleeve (701), and the directional sliding rod (704) is connected to the labyrinth layer (702) at the upper position. A connecting spring (705) is provided at an external position in the middle of the upper cooperative sleeve (701); a cooperative sleeve plate (4) is installed at a position on the valve stem (5) corresponding to the upper side of the labyrinth sleeve (7); a plurality of pillars corresponding to the upper cooperative sleeve (701) are installed at a position on the lower surface of the cooperative sleeve plate (4); medium flow grooves (8) that fit each other in the labyrinth layer (702) between two adjacent positions form a medium flow channel; and the medium flow grooves (8) are in a multi-directional right-angle bending state along the diameter direction of the labyrinth layer (702).

2. The high temperature and high pressure regulating valve with an adaptive labyrinth flow channel structure according to claim 1, characterized in that: The inner diameter of the labyrinth sleeve (7) is equal to the outer diameter of the valve block (6).

3. The high temperature and high pressure regulating valve with an adaptive labyrinth flow channel structure according to claim 1, characterized in that: An end position of the medium flow channel corresponding to the labyrinth sleeve (7) close to the inner curved surface of the valve block (6) is set as a front-valve inlet or a rear-valve outlet.

4. The high temperature and high pressure regulating valve with an adaptive labyrinth flow channel structure according to claim 1, characterized in that: The medium flow channel is provided with the following three setting states through the medium flow groove (8): State 1: the groove surface of the medium flow groove (8) remains horizontal with the horizontal plane; State 2: the cross section of the groove surface of the medium flow groove (8) located on the upper surface of the labyrinth layer (702) is in an upwardly curved arched state, and the cross section of the groove surface of the medium flow groove (8) located on the lower surface of the labyrinth layer (702) is in a downwardly curved arched state; State three: the groove surface of the medium flow groove (8) is arranged in an upward or downward inclined state along the diameter direction of the labyrinth layer (702).

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