A high-pressure differential pressure-reducing and noise-reducing labyrinth disc for pressure-reducing valves

Abstract

The present invention relates to a high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve, comprising a disc base and at least two labyrinth flow channels distributed in an annular array on the disc base, each of the labyrinth flow channels comprising at least two inlet flow channels, at least one outlet flow channel, and a circuitous pressure-reducing flow channel connected between the inlet flow channels and the outlet flow channels; the circuitous pressure-reducing flow channel comprises two converging flow channels and one diverting flow channel, wherein the fluid input from the inlet flow channel converges in one of the converging flow channels, is then diverted and reconverged in the diverting flow channel and the other converging flow channel, and finally output from the outlet flow channel. The present invention greatly increases the number of pressure-reducing stages within a limited space, fully enables the fluid to be diverted and counteracted, improves the pressure-reducing stability and pressure-reducing amplitude of the pressure-reducing valve, reduces the generation of cavitation and cavitation, and is suitable for high-pressure differential and high-flow rate working conditions.

Description

Technical Field

[0001] The invention belongs to the field of valves, and in particular relates to a high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve. Background Art

[0002] In the field of industrial technology, there are more and more harsh working conditions such as high temperature, high pressure, high pressure difference, high flow rate, and large flow rate. The fluid flow rate under high pressure difference conditions is very high, which can easily lead to serious problems such as scouring, cavitation, vibration, and noise in the valve flow channel. For the labyrinth pressure reducing valve, although the existing disc design structure ideas are different, its labyrinth flow channel is mostly a single flow channel structure, either the number of pressure reduction stages under a certain size is small, the pressure reduction amplitude is small, or the space utilization rate is low and the scope of application is small. Similarly, the labyrinth disc with a spiral labyrinth channel structure, such as the labyrinth disc described in patent application CN202210038997.4, has a low degree of pressure reduction and low flow channel utilization.

[0003] In short, the throttling effect of existing labyrinth discs is limited and unsatisfactory under high temperature, high pressure differential, and high flow rate conditions. Therefore, how to effectively improve the pressure relief effect of the pressure reducing valve by changing the structure of the flow channel on the disc while minimizing noise is an urgent technical problem to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve in order to solve the above-mentioned problems, which greatly increases the number of pressure-reducing stages within a limited space, fully enables the fluid to be diverted and counteracted, improves the pressure-reducing stability and pressure-reducing amplitude of the pressure-reducing valve, reduces the generation of cavitation and cavitation, and is suitable for high-pressure differential and high-flow rate working conditions.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve comprises a disc base and at least two labyrinth flow channels distributed in an annular array on the disc base, each of the labyrinth flow channels comprising at least two inlet flow channels, at least one outlet flow channel, and a circuitous pressure-reducing flow channel connected between the inlet flow channel and the outlet flow channel;

[0007] The circuitous decompression channel includes two converging channels and one diverging channel. The fluid input from the inlet channel converges in one of the converging channels, is diverged in the diverging channel and the other converging channel, and then converges again before being output from the outlet channel.

[0008] The converging flow channel includes a first straight channel, a first multi-channel portion connected to both ends of the first straight channel, and a first throttling portion connected to the middle of the first straight channel, wherein the first multi-channel portion and the first throttling portion are the input end and the output end of the converging flow channel respectively;

[0009] The diversion channel includes a second straight channel, a second multi-channel portion connected in parallel on both sides of the middle of the second straight channel, and a second throttling portion connected to both ends of the second straight channel. The second multi-channel portion and the second throttling portion are the input end and output end of the diversion channel respectively.

[0010] As a further optimized solution of the present invention, the labyrinth flow channel is formed by a groove provided on the disc base, or is formed by a valley formed between a plurality of protrusions provided on the disc base.

[0011] As a further optimization solution of the present invention, the cross-sections of the inlet flow channel and the outlet flow channel are set to be rectangular or trumpet-shaped, and the output end widths of the trumpet-shaped inlet flow channel and outlet flow channel are both larger than the input end widths.

[0012] As a further optimization scheme of the present invention, the first multi-channel part and the second multi-channel part are both combined channels of straight segment channels and circular arc segment channels, the circular arc segment channels are connected in parallel with the straight segment channels, and the straight segment channels are collinearly arranged with the straight channel connected on one side.

[0013] As a further optimization solution of the present invention, the straight segment channel and the arc segment channel have the same width, and the channel width is 0.5-1.25 times the width of the inlet flow channel.

[0014] As a further optimization solution of the present invention, the angle between the inlet flow channel and the straight section channel of the first multi-channel portion is a, and 45°≤a≤180°.

[0015] As a further optimization solution of the present invention, the center radius of the arc segment channel is 1-5 times the width of the inlet flow channel.

[0016] As a further optimization solution of the present invention, the distance between the outlet of the first multi-channel portion and the center of the first throttling portion is 1.5-8 times the width of the inlet flow channel.

[0017] As a further optimization solution of the present invention, the center distance between the first throttling portion and the second multi-channel portion is 3-8 times the width of the inlet flow channel.

[0018] As a further optimization solution of the present invention, the width of the outlet flow channel is 1-2.5 times the width of the inlet flow channel.

[0019] The beneficial effects of the present invention are:

[0020] 1) The present invention greatly extends the flow distance of the fluid through the labyrinth disk within a limited space by designing the circuitous decompression flow channel into a multi-channel circuitous structure, thereby increasing the number of pressure reduction stages of the flow channel, and making the step-by-step pressure reduction more stable;

[0021] 2) The labyrinth flow channel of the present invention causes the fluid medium to continuously divert and counteract in multiple multi-channel sections, continuously impacting and colliding to dissipate energy. Compared with related technologies, the labyrinth disc provided by the present invention has a strong and stable pressure reduction capability, can prevent the generation of cavitation, and reduce the probability of cavitation.

[0022] 3) The present invention optimizes the parameters by performing specific parameter settings on the labyrinth flow channel, making it easier to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the maze disc of the present invention.

[0024] Figure 2 It is a top view of the labyrinth flow channel on the labyrinth disk of the present invention.

[0025] Figure 3 A pressure distribution cloud diagram of a labyrinth flow channel in the labyrinth disc of the present invention.

[0026] Figure 4 It is the pressure distribution cloud diagram of the general comparative labyrinth flow channel.

[0027] In the figure: 1, disc base; 2, central cavity; 3, labyrinth flow channel; 31, inlet flow channel; 32, first multi-channel section; 33, first throttling section; 34, second multi-channel section; 35, second throttling section; 36, third multi-channel section; 37, third throttling section; 38, outlet flow channel. DETAILED DESCRIPTION

[0028] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] Example 1

[0030] like Figure 1 As shown, an embodiment of the present invention provides a high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve, comprising a disc base 1 and at least two labyrinth flow channels 3 distributed in an annular array on the disc base 1. The disc base 1 is annular and forms a central cavity 2 therein.

[0031] The labyrinth flow channel 3 is formed by a groove provided on the disc substrate 1, or by a valley formed between a plurality of protrusions provided on the disc substrate 1;

[0032] Each of the labyrinth channels 3 includes at least two inlet channels 31, at least one outlet channel 38, and a circuitous pressure-reducing channel connected between the inlet channels 31 and the outlet channels 38. In an embodiment of the present invention, the number of labyrinth channels 3 on the disc substrate 1 can be two, three, or even more. Generally speaking, when the fluid pressure at the inlet and outlet is fixed, as the number of labyrinth channels 3 increases, the flow rate of the fluid passing through the labyrinth channels 3 also increases, and the flow capacity of the labyrinth disc gradually increases. The labyrinth channels 3 are evenly arranged on the disc substrate 1. For ease of description, the following text will use the term "labyrinth channels 3" to describe the flow of fluid through the labyrinth channels 3. Figure 1 The disc substrate 1 shown in FIG is provided with fourteen labyrinth flow channels 3 as an example for description.

[0033] like Figure 2 As shown, the circuitous decompression flow channel includes a No. 1 converging flow channel, a No. 2 converging flow channel, and a diverting flow channel. The fluid input from the inlet flow channel 31 is merged in the No. 1 converging flow channel, and then successively diverges and converges in the diverting flow channel and the No. 2 converging flow channel, and finally outputs from the outlet flow channel 38, wherein the outlet flow channel 38 extends radially along the disc substrate 1;

[0034] The first converging flow channel includes a first straight channel, a first multi-channel portion 32 connected to both ends of the first straight channel, and a first throttling portion 33 connected to the middle of the first straight channel. The first multi-channel portion 32 and the first throttling portion 33 are the input end and output end of the first converging flow channel, respectively. The first multi-channel portion 32 is connected to the inlet flow channel 31, and the first throttling portion 33 is connected to the diverting flow channel.

[0035] The diverter flow channel includes a second straight channel, a second multi-channel portion 34 connected in parallel on both sides of the middle portion of the second straight channel, and a second throttling portion 35 connected to both ends of the second straight channel. The second multi-channel portion 34 and the second throttling portion 35 are the input end and the output end of the diverter flow channel respectively. The second multi-channel portion 34 is connected to the first throttling portion 33, and the second throttling portion 35 is connected to the second converging flow channel.

[0036] The second converging flow channel includes a third linear channel, a third multi-channel portion 36 connected to both ends of the third linear channel, and a third throttling portion 37 connected to the middle of the third linear channel. The third multi-channel portion 36 and the third throttling portion 37 are the input and output ends of the second converging flow channel, respectively. The third multi-channel portion 36 is connected to the second throttling portion 35, and the third throttling portion 37 is connected to the outlet flow channel 38.

[0037] The first multi-channel portion and the second multi-channel portion 34 are both combined channels of straight segment channels and arc segment channels. The arc segment channels are connected in parallel with the straight segment channels, and the straight segment channels are collinearly arranged with the straight channel connected on one side.

[0038] The width of the inlet channel 31 is set to b, then

[0039] The width of the straight section of the two converging flow channels and one diverging flow channel is m, 0.5≤m / b≤1.25;

[0040] The width of the arc section of the two converging flow channels and one diverging flow channel is n, 0.5≤n / b≤1.25;

[0041] The center radius of the arc section of the two converging flow channels and one diverging flow channel is r, 1≤n / b≤5;

[0042] The distance between the outlet of the first multi-pass section and the center of the first throttling section is p, 1.5≤p / b≤8;

[0043] The center distance between the first throttling portion and the second multi-pass portion 34 is q, 3≤q / b≤8;

[0044] The width of the outlet flow channel 38 is d, 1≤d / b≤2.5;

[0045] The angle between the inlet flow channel 31 of the labyrinth channel and the straight section channel of the first multi-channel portion is a, 45°≤a≤180°;

[0046] The sum of the inlet widths of the two input ends of the converging flow channel connected to the outlet flow channel 38 is equal to the width of the outlet flow channel 38 .

[0047] Generally speaking, the cross-sections of the inlet flow channel 31 and the outlet flow channel 38 are set to be rectangular, that is, the cross-sectional shape and size of the inlet flow channel 31 remain unchanged in the extension direction of the inlet flow channel 31, and the cross-sectional shape and size of the outlet flow channel 38 also remain unchanged in the extension direction of the outlet flow channel 38.

[0048] Of course, in some embodiments, the inlet flow channel 31 and the outlet flow channel 38 can also be designed to be trumpet-shaped, that is, the width of the outlet end of the inlet flow channel 31 is greater than the width of the inlet end of the inlet flow channel 31, and the width of the outlet end of the outlet flow channel 38 is greater than the width of the inlet end of the outlet flow channel 38.

[0049] like Figure 3 、 Figure 4 As shown, by comparing the labyrinth flow channel 3 with similar design, it can be found that under the same inlet pressure and the same flow channel inlet size, the labyrinth flow channel 3 of the present invention reduces the pressure by combining a number of multi-channel parts and throttling parts, so that the fluid directly faces the arc segment channel inlet, and at the same time, due to the setting of chamfers at the bend of the flow channel, a part of the fluid flows through the straight segment channel. Through the reasonable arrangement of the circular arc segment channel and the straight segment channel, the fluid medium on the cross section of the labyrinth flow channel 3 of the present invention is more evenly distributed, and there are fewer local high-pressure areas.

[0050] also, Figure 3 、 Figure 4 By comparison, the present invention allows the fluid medium to experience a certain pressure drop with each turn. This step-by-step pressure reduction reduces the likelihood of flash evaporation and cavitation, achieving true graded pressure reduction. Furthermore, under this high-pressure condition, each confluence causes the fluid to flow a certain distance within the straight-line channel, resulting in a more uniform pressure drop compared to the control. This effectively utilizes the space within the labyrinthine flow channel 3 for stable pressure reduction. Furthermore, the flow channels are rationally arranged on the disc, resulting in higher space utilization and a significant pressure reduction effect. This makes it suitable for use under high-temperature, high-pressure differential, and high-flow rate conditions.

[0051] In summary, when the fluid medium flows in the labyrinth flow channel 3 of the present invention and flows through the multi-channel sections in the circuitous pressure-reducing flow channel, the straight channel and the arc channel continuously divert the fluid medium. At the intersection of the two, due to the bending and swirling of the arc channel, the medium flow direction of the arc channel intersects with the medium of the straight channel, generating turbulence, causing internal resistance loss of the medium, reducing its energy and lowering its pressure. The fluid medium at the throttling section can also reduce pressure due to the counter-pressure dissipation of energy. The substantial pressure reduction in the flow channel mainly depends on the multi-channel section, and this structure can also be added to other throttling areas.

[0052] It should be noted that when technical personnel in this field design multiple multi-channel parts, after the fluid flows out of the multi-channel part, it should be verified based on advanced fluid simulation software and should flow through a certain length of straight channel to allow the fluid medium to fully develop and ensure that the pressure and velocity distribution on the flow cross-section of the flow channel to the next throttling part is uniform, so as to achieve a better pressure reduction effect.

[0053] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve, comprising a disc base and at least two labyrinth flow channels distributed in an annular array on the disc base, characterized in that: Each of the labyrinth flow channels comprises at least two inlet flow channels, at least one outlet flow channel, and a circuitous pressure-reducing flow channel connected between the inlet flow channels and the outlet flow channels; The circuitous decompression channel includes two converging channels and one diverging channel. The fluid input from the inlet channel converges in one of the converging channels, is diverged in the diverging channel and the other converging channel, and then converges again before being output from the outlet channel. The converging flow channel includes a first straight channel, a first multi-channel portion connected to both ends of the first straight channel, and a first throttling portion connected to the middle of the first straight channel, wherein the first multi-channel portion and the first throttling portion are the input end and the output end of the converging flow channel respectively; The diverter channel includes a second linear channel, a second multi-channel portion connected in parallel on both sides of the middle portion of the second linear channel, and a second throttling portion connected to both ends of the second linear channel, wherein the second multi-channel portion and the second throttling portion are the input end and the output end of the diverter channel respectively; The second throttling portion is connected to the second converging flow channel, and the second converging flow channel includes a third straight channel, a third multi-channel portion connected to both ends of the third straight channel, and a third throttling portion connected to the middle of the third straight channel. The third multi-channel portion and the third throttling portion are the input end and output end of the second converging flow channel respectively. The third multi-channel portion is connected to the second throttling portion, and the third throttling portion is connected to the outlet flow channel. The first multi-channel portion and the second multi-channel portion are both combined channels of straight-line segments and circular-arc segment channels, the circular-arc segment channels are connected in parallel with the straight-line segments, and the straight-line segments are collinearly arranged with the straight-line channel connected on one side; Under high pressure, each confluence makes the fluid flow a certain distance in the straight section channel to improve the uniformity of pressure drop.

2. The high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve according to claim 1, characterized in that: The labyrinth flow channel is formed by a groove provided on the disc base, or by a valley formed between a plurality of protrusions provided on the disc base.

3. The high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve according to claim 1, characterized in that: The cross sections of the inlet flow channel and the outlet flow channel are set to be rectangular or trumpet-shaped, and the output end widths of the trumpet-shaped inlet flow channel and the outlet flow channel are both larger than the input end widths.

4. The high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve according to claim 1, characterized in that: The straight section channel and the arc section channel have the same width, and the channel width is 0.5-1.25 times the width of the inlet flow channel.

5. The high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve according to claim 1, characterized in that: The angle between the inlet flow channel and the straight section channel of the first multi-channel portion is a, and 45°≤a≤180°.

6. The high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve according to claim 1, characterized in that: The center radius of the arc segment channel is 1-5 times the width of the inlet flow channel.

7. The high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve according to claim 1, characterized in that: The center distance between the outlet of the first multi-channel portion and the first throttling portion is 1.5-8 times the width of the inlet flow channel.

8. The high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve according to claim 1, characterized in that: The center distance between the first throttling portion and the second multi-channel portion is 3-8 times the width of the inlet flow channel.

9. The high-pressure differential pressure-reducing and noise-reducing labyrinth disc for a pressure-reducing valve according to claim 1, characterized in that: The width of the outlet flow channel is 1-2.5 times the width of the inlet flow channel.

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