A damping constant flow valve

Abstract

This invention discloses a damping constant flow valve, comprising a valve body 1, one or more valve bodies 2 and 3 sequentially fitted together. Diaphragms 1 and 2 are installed at adjacent joints of valve bodies 1, 2, and 3. Diaphragms 1 and 2, combined with the inner wall of at least one valve body 2, form a sealed cavity. The outer side of diaphragm 1 forms cavity 1, and the outer side of diaphragm 2 forms cavity 2. Cavity 1 has an inlet for medium inflow, and cavity 2 has an outlet for medium outflow. A connecting channel is provided between cavity 1 and cavity 2. The valve also includes a valve core, which autonomously changes the flow area at the outlet under pressure differential. While achieving stable flow, the valve effectively utilizes the compressibility of the gas in the cavity to buffer pulsations by absorbing peaks and filling valleys, smoothing out sawtooth flow pulsations and eliminating over 90% of pulses. This greatly ensures the stability of instantaneous flow velocity, reduces the generation of impacts, vibrations, and noise, and improves reliability and lifespan.

Description

Technical Field

[0001] This invention relates to the field of pulsation damper technology, and in particular to a damping constant flow valve. Background Technology

[0002] In the field of media circulation, constant flow valves are usually used to stabilize the flow rate, so as to automatically stabilize the outlet flow rate within a certain pressure difference range and not be affected by the fluctuation of the inlet pressure.

[0003] Diaphragm constant flow valves are commonly used constant flow valves. They are essentially reciprocating positive displacement pumps that rely on the periodic reciprocating motion of a diaphragm to draw in and discharge liquid.

[0004] In practical applications, diaphragm-type constant flow valves in existing technologies generally exhibit high-frequency, small-amplitude sawtooth-shaped flow pulsations rather than absolutely flat and stable flow. This is determined by their working principle and structural characteristics. These sawtooth-shaped flow pulsations will cause a certain fluctuation in flow rate, especially the sudden changes in instantaneous flow velocity, leading to inaccurate metering and dispensing in precision applications. They will also cause periodic impacts, vibrations, and noise to pipelines, and may even cause leaks at joints, accelerate wear, and affect service life. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a rationally structured damping constant flow valve. This valve achieves stable flow while effectively utilizing the compressibility of the gas in the cavity to buffer pulsations by absorbing peaks and filling valleys. This smooths out sawtooth-shaped flow pulsations, greatly ensuring the stability of instantaneous flow velocity, reducing the generation of impacts, vibrations, and noise, and improving reliability and lifespan.

[0006] The technical solution adopted in this invention is as follows: A damping constant flow valve includes a valve body 1, one or more valve bodies 2 and 3 sequentially fitted together. A diaphragm 1 is installed at the junction of valve body 1 and valve body 2 or between adjacent valve bodies 2. A diaphragm 2 is installed at the junction of valve body 2 and valve body 3 or between adjacent valve bodies 2. The diaphragm 1 and diaphragm 2, together with the inner wall surface of at least one valve body 2, form a sealed cavity. The outer side of diaphragm 1 forms cavity 1, and the outer side of diaphragm 2 forms cavity 2. Cavity 1 has an inlet for medium to flow in, and cavity 2 has an outlet for medium to flow out. A connecting channel is provided between cavity 1 and cavity 2. The valve valve also includes a valve core arranged towards the outlet, which autonomously changes the flow area at the outlet under the action of pressure difference.

[0007] As a further improvement to the above technical solution: One end of the valve core is mounted on the diaphragm two via the mounting assembly, and the other end of the valve core is positioned facing the outlet; an elastic element is installed between the mounting assembly and the inner wall of the valve body three, and the elastic direction of the elastic element is consistent with the direction of the valve core facing the outlet.

[0008] The structure of the installation assembly is as follows: it includes pressure plate one and pressure plate two located on both sides of diaphragm two via fasteners, and a locking member passes through pressure plate one, diaphragm two, and pressure plate two to lock the valve core end. The locking member and valve core are located on both sides of pressure plate one and pressure plate two, respectively.

[0009] The first diaphragm is a convex membrane structure that protrudes towards the cavity, and the second diaphragm is a flat membrane structure.

[0010] The diameter of the valve core's end facing the outlet gradually decreases, and the flow area at the outlet is changed by the movement of the valve core toward or away from the outlet.

[0011] A pressure sensor is installed inside the cavity; an interface is provided on the valve body 2, through which air is injected into the cavity.

[0012] The number of connection channels is one or more; the connection channel is a pipeline structure externally connected between valve body one and valve body three, or the connection channel is a channel structure internally connected between valve body one and valve body three.

[0013] The cavity two outside the second diaphragm is provided with a space for the second diaphragm to float; the cavity one outside the first diaphragm is provided with a space for the first diaphragm to float, and the diaphragm is circumferentially attached to the inner wall of the valve body or has a gap.

[0014] The valve body, which is away from the second diaphragm, has through holes at its three ends, one inside and one outside. The inner opening of the through hole forms an outlet that mates with the valve core. Alternatively, a guide block is installed at the inner opening of the through hole. The guide block has a hole coaxial with the through hole that forms an outlet. The valve body also includes an insert that is embedded in the guide block and allows the valve core to pass through and be guided.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves stable flow rate while effectively utilizing the compressibility of the gas in the cavity to buffer the pulsation by absorbing peaks and filling valleys, causing the sawtooth flow pulsation to tend to flatten out, eliminating more than 90% of the pulses, greatly ensuring the stability of instantaneous flow rate, reducing the generation of impact, vibration, noise, etc., and improving the reliability and service life. The present invention also includes the following advantages: By setting up valve body one, valve body two, and valve body three, the effective and reliable installation of diaphragm one and diaphragm two is achieved, forming a cavity while ensuring its sealing performance. Furthermore, the interface on valve body two allows for convenient, quick, and reliable air replenishment into the cavity, meeting usage requirements, ensuring the reliability of actual use, and helping to improve the flexibility of use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention (Embodiment 1).

[0017] Figure 2 This is a schematic diagram of the structure of the present invention (Embodiment 2).

[0018] Figure 3 This is a simplified schematic diagram of the principle of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the present invention (Embodiment 3).

[0020] Figure 5 This is a schematic diagram illustrating the peak absorption and valley filling effect of the present invention in steady flow.

[0021] The components are as follows: 1. Valve body one; 2. Valve body two; 3. Valve body three; 4. Diaphragm two; 5. Diaphragm one; 6. Mounting assembly; 7. Valve core; 8. Elastic element; 9. Connecting channel; 10. Cavity one; 20. Cavity; 30. Cavity two; 40. Cavity three; 50. Guide block; 51. Gasket; 52. Insert; 60. Support; 11. Entrance; 31. Export. Detailed Implementation

[0022] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, a damping constant flow valve of this embodiment includes a valve body 1, one or more valve bodies 2 and 3 sequentially fitted together. A diaphragm 5 is installed at the junction of valve body 1 and valve body 2 or between adjacent valve bodies 2. A diaphragm 4 is installed at the junction of valve body 2 and valve body 3 or between adjacent valve bodies 2. The diaphragm 5 and diaphragm 4, together with the inner wall surface of at least one valve body 2, form a sealed cavity 20. The outer side of diaphragm 5 forms cavity 10, and the outer side of diaphragm 4 forms cavity 20. Cavity 10 has an inlet 11 for medium to flow in, and cavity 20 has an outlet 31 for medium to flow out. A connecting channel 9 is provided between cavity 10 and cavity 20. The valve also includes a valve core 7 arranged towards the outlet 31. The valve core 7 autonomously changes the flow area at the outlet 31 under the action of pressure difference to ensure a relatively constant flow rate.

[0024] In this embodiment, a flexible, hollow, and variable-volume sealed cavity 20 is formed by diaphragm 1 5, diaphragm 2 4, and at least one valve body 2. The cavity 20 is located between and separates cavity 10 and cavity 2 30. Cavity 1 10 has an inlet 11, and cavity 2 30 has an outlet 31. During the process of the medium flowing into cavity 10 from inlet 11, passing through connecting channel 9, and flowing out of cavity 2 30 from outlet 31, the valve core 7 will continuously jump relative to outlet 31 to change the flow area and stabilize the flow rate due to pressure difference fluctuations. Simultaneously, the cavity 20 itself will also experience volume changes due to the compressibility of the internal gas, autonomously adjusting the volume of cavity 10 and cavity 2 30 according to pressure difference changes. This provides a buffering effect of absorbing peaks and filling valleys under pulsating flow conditions, smoothing out the originally sawtooth-shaped flow pulsations. Figure 5 As shown.

[0025] In actual operation, nitrogen can be injected into cavity 20. The pre-charge pressure of nitrogen can be set according to actual usage requirements, such as 50%-70% of the pressure in the pipeline being used.

[0026] In this embodiment, the materials of diaphragm 5 and diaphragm 4 can be conventional diaphragm materials, such as PTFE (polytetrafluoroethylene) and fluororubber. They can be combined with valve body 2 to form cavity 20. While the volume can change as the gas is affected by the pressure difference, the two side cavities 10 and 30 are separated into independent spaces.

[0027] In actual operation, the thickness of diaphragm 5 and diaphragm 4 can be set according to different head requirements to ensure pressure resistance and service life under actual use conditions.

[0028] exist Figure 1 In the first embodiment shown, a second valve body 2 is provided between valve body 1 and valve body 3, and diaphragm 5 and diaphragm 4 are respectively provided on both sides of valve body 2 and between valve body 1 and valve body 3.

[0029] exist Figure 2 In the second embodiment shown, two valve bodies 2 are provided between valve body 1 and valve body 3, diaphragm 5 is provided between adjacent valve bodies 2, and diaphragm 5 is provided between valve body 3 and valve body 2.

[0030] In practical use, the number of valve bodies 2 can be set according to the requirements of pressure, diaphragm 5 floating space, etc., so that at least one valve body 2 can be combined between diaphragm 5 and diaphragm 4 to form a cavity 20.

[0031] One end of the valve core 7 is mounted on the diaphragm 4 via the mounting assembly 6, and the other end of the valve core 7 is arranged facing the outlet 31; thereby realizing the effective installation of the valve core 7 in the cavity 30, and making the moving direction of the valve core 7 face the outlet 31 so that the real-time flow area at the outlet 31 can be changed as the valve core 7 moves.

[0032] An elastic element 8 is installed between the mounting component 6 and the inner wall of the valve body 3. The elastic direction of the elastic element 8 is consistent with the direction of the valve core 7 toward the outlet 31. Thus, after the valve core 7 moves relative to the outlet 31 due to the pressure difference, the energy stored in the elastic element 8 can cause the valve core 7 to reset.

[0033] In actual operation, the elastic element 8 can be one or more springs, as long as they can satisfy the reset of the valve core 7.

[0034] In one embodiment, the elastic element 8 can be sleeved on the outer periphery of the valve core 7 to effectively ensure that the valve core 7 is reliably, effectively, and stably reset by the elastic element 8.

[0035] In one embodiment, the elastic element 8 that drives the valve core 7 to reset acts directly on the mounting assembly 6, which can effectively ensure the accurate and timely reset of the valve core 7, and at the same time effectively avoid damage to the diaphragm during long-term use.

[0036] The structure of the mounting assembly 6 is as follows: it includes a pressure plate 1 and a pressure plate 2 located on both sides of the diaphragm 2 4 via fasteners, and a locking member passing through the pressure plate 1, the diaphragm 2 4, and the pressure plate 2 to lock the valve core 7 at the end. The locking member and the valve core 7 are located on both sides of the pressure plate 1 and the pressure plate 2, respectively. Thus, the mounting assembly 6 achieves reliable and effective installation of the valve core 7 on the diaphragm 2 4.

[0037] In one embodiment, a sealing ring can be press-fitted between the first pressure plate and the second diaphragm 4, and between the second pressure plate and the second diaphragm 4. The fasteners can be common structures such as bolts and nuts, thereby realizing the installation and pressing of the first pressure plate and the second pressure plate on both sides of the second diaphragm 4 and ensuring effective sealing of the connection.

[0038] In this embodiment, the locking component can be a long bolt, which passes through pressure plate 1, diaphragm 2 4, and pressure plate 2 and is then locked to the end of valve core 7.

[0039] Diaphragm 5 is a convex membrane structure that protrudes towards cavity 10, and diaphragm 4 is a flat membrane structure; thus, while forming cavity 20 and satisfying the use of pulsation buffer, it can effectively realize and ensure the reliable installation and use of valve core 7.

[0040] In one embodiment, the inlet 11 and outlet 31 are both positioned directly opposite the cavity 20, effectively ensuring the effect of pulsation buffering.

[0041] The diameter of the end of the valve core 7 facing the outlet 31 gradually decreases, and the flow area at the outlet 31 is changed by the movement of the valve core 7 toward or away from the outlet 31.

[0042] A pressure sensor is installed inside the cavity 20 to monitor the internal pressure of the cavity 20 in real time.

[0043] In one embodiment, the pressure sensor can be installed on the wall of valve body 2 and positioned facing the cavity 20, effectively ensuring the reliable use of the pressure sensor.

[0044] The valve body 2 is provided with an interface, through which air is injected into the cavity 20.

[0045] In this embodiment, the arrangement of valve body 1, valve body 2, and valve body 3 enables the effective, reliable, and convenient installation of diaphragm 5 and diaphragm 4, forming cavity 20 while ensuring its sealing performance. Furthermore, the interface on valve body 2 allows for convenient, rapid, and reliable air replenishment into cavity 20, meeting usage requirements, ensuring reliability in actual use, and enhancing the flexibility of use.

[0046] In actual operation, a structure of long bolts combined with nuts can be used to lock and tighten the flange parts of valve body 1, valve body 2, and valve body 3 in sequence, effectively ensuring their effective connection and reliable installation of diaphragm 5 and diaphragm 4.

[0047] The number of connecting channels 9 is one or more; the connecting channel 9 is a pipeline structure externally connected between valve body 1 and valve body 3, or the connecting channel 9 is a channel structure internally connected between valve body 1 and valve body 3, satisfying the medium flow between cavity 10 and cavity 30.

[0048] In one embodiment, such as Figure 1 As shown, a connecting channel 9 is provided, and the two ends of the connecting channel 9 are respectively connected to the sides of cavity 10 and cavity 2 30 via connectors.

[0049] exist Figure 4 In the embodiment shown, the connecting channel 9 is located inside valve body 1, valve body 2, and valve body 3, and can connect between cavity 10 and cavity 30.

[0050] exist Figure 1 In the illustrated embodiment, a space for the diaphragm 4 to float is provided in the cavity 30 outside the diaphragm 4. A space for the diaphragm 5 to float is provided in the cavity 10 outside the diaphragm 5, and the diaphragm 5 is circumferentially attached to the inner wall of the valve body 1 or has a gap.

[0051] In one embodiment, such as Figure 1As shown, a T-shaped hole is provided on the end face of valve body 1, and diaphragm 5 is fitted and installed on the large end of the T-shaped hole, with the protruding part of diaphragm 5 extending into the small hole of the T-shaped hole.

[0052] In another embodiment, such as Figure 2 As shown, a gap is provided between the diaphragm 5 and the end face of the valve body 1.

[0053] A hollow support 60 is provided in the cavity 10 located outside the diaphragm 5. The support 60 is arranged in a contoured manner with the diaphragm 5, such as... Figure 3 As shown.

[0054] In this embodiment, the support member 60 provides limiting support for the diaphragm 5, especially during the pressurization process toward the cavity 20, effectively preventing the diaphragm 5 from being damaged due to excessive pressure.

[0055] In this embodiment, the support 60 can be a mesh structure or other structural forms, as long as it can provide limiting support for the diaphragm 5 without affecting the passage of the medium through the support 60.

[0056] A through hole is provided at the end of the valve body 3 opposite to the diaphragm 4, and the inner orifice of the through hole forms the outlet 31 that cooperates with the valve core 7.

[0057] In one embodiment, a cavity 340 is provided on the outer side of the outlet 31. For example, as Figure 1 As shown, the through hole located outside the outlet 31 forms cavity 340; as Figure 3 As shown, a baffle can be installed on the valve body 3, and a hole that mates with the valve core 7 is opened on the baffle to form an outlet 31. The outer side of the baffle forms a cavity 40.

[0058] exist Figure 2 and Figure 4 In the embodiment shown, a guide block 50 is installed at the inner orifice of the three through holes of the valve body. The guide block 50 has a hole coaxial with the through hole to form an outlet 31. It also includes an insert 52 embedded in the guide block 50 for the valve core 7 to pass through and guide. Thus, while the actual flow area of ​​the outlet 31 is adjusted by the action of the valve core 7, the reliability and consistency of the action of the valve core 7 are effectively guaranteed.

[0059] In this embodiment, a gasket 51 is press-fitted at the contact point between the guide block 50 and the through hole opening.

[0060] In this embodiment, the guide block 50 has a cross-shaped hole, and an insert 52 that is fitted through the valve core 7 is installed at one of the holes. The hole directly opposite the valve core 7 forms the outlet 31.

[0061] This embodiment effectively utilizes the compressibility of gases and Boyle's law to stabilize pipeline pressure and flow rate, especially the instantaneous flow rate, through "peak absorption and valley filling". Its specific operating principle is as follows.

[0062] In actual use, there are both discharge and intake strokes.

[0063] During the discharge stroke, the outlet pressure of the buffer increases, and the medium pushes the valve core 7 upward. The gas in the cavity 20 is compressed and its volume decreases, and more medium is stored inside the cavity 10, thereby reducing the peak flow rate.

[0064] During the suction stroke, the outlet pressure of the buffer decreases, the gas in the cavity 20 expands, and the medium is pushed downward by the valve core 7, causing the medium to be released, thereby filling the flow trough.

[0065] like Figure 3 As shown, the buffer flattens the pulsation curve during the steady-state process, thus playing a role in absorbing peaks and filling valleys to buffer the pulsation.

[0066] This invention achieves stable flow rate while effectively utilizing the compressibility of the gas in the cavity to buffer the pulsation by absorbing peaks and filling valleys, causing the sawtooth flow pulsation to tend to flatten out, eliminating more than 90% of the pulses, greatly ensuring the stability of instantaneous flow rate, reducing the generation of impact, vibration, noise, etc., and improving the reliability and service life.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0068] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A damping constant flow valve, characterized in that: The system includes a valve body 1 (1), one or more valve bodies 2 (2), and a valve body 3 (3) that are sequentially fitted together. A diaphragm 1 (5) is installed at the junction of valve body 1 (1) and valve body 2 (2) or between adjacent valve bodies 2 (2). A diaphragm 2 (4) is installed at the junction of valve body 2 (2) and valve body 3 (3) or between adjacent valve bodies 2 (2). The diaphragm 1 (5) and diaphragm 2 (4) together with the inner wall of at least one valve body 2 (2) form a sealed cavity (20). The outer side of the diaphragm (4) forms cavity one (10), and the outer side of the diaphragm (4) forms cavity two (30); cavity one (10) is provided with an inlet (11) for the medium to flow in, and cavity two (30) is provided with an outlet (31) for the medium to flow out. A connecting channel (9) is provided between cavity one (10) and cavity two (30); it also includes a valve core (7) arranged towards the outlet (31), and the valve core (7) changes the flow area at the outlet (31) autonomously under the action of pressure difference.

2. The damping constant flow valve as described in claim 1, characterized in that: One end of the valve core (7) is mounted on the diaphragm (4) via the mounting assembly (6), and the other end of the valve core (7) is arranged facing the outlet (31); an elastic element (8) is installed between the mounting assembly (6) and the inner wall of the valve body (3), and the elastic direction of the elastic element (8) is consistent with the direction of the valve core (7) facing the outlet (31).

3. The damping constant flow valve as described in claim 2, characterized in that: The structure of the installation component (6) is as follows: it includes pressure plate one and pressure plate two located on both sides of diaphragm two (4) by fasteners, and locking member passes through pressure plate one, diaphragm two (4) and pressure plate two to lock the valve core (7) end, and the locking member and valve core (7) are located on both sides of pressure plate one and pressure plate two respectively.

4. The damping constant flow valve as described in claim 1, characterized in that: The first diaphragm (5) is a convex membrane structure that protrudes toward the first cavity (10), and the second diaphragm (4) is a flat membrane structure.

5. A damping constant flow valve as described in claim 1, characterized in that: The diameter of the end of the valve core (7) facing the outlet (31) gradually decreases, and the flow area at the outlet (31) is changed by the movement of the valve core (7) toward or away from the outlet (31).

6. The damping constant flow valve as described in claim 1, characterized in that: A pressure sensor is installed inside the cavity (20); an interface is provided on the valve body (2) to inflate the cavity (20) through the interface.

7. A damping constant flow valve as described in claim 1, characterized in that: The number of the connecting channels (9) is one or more; the connecting channel (9) is a pipeline structure externally connected between valve body one (1) and valve body three (3), or the connecting channel (9) is a channel structure internally connected between valve body one (1) and valve body three (3).

8. A damping constant flow valve as described in claim 1, characterized in that: The cavity 2 (30) outside the diaphragm 2 (4) is provided with a space for the diaphragm 2 (4) to float; the cavity 1 (10) outside the diaphragm 1 (5) is provided with a space for the diaphragm 1 (5) to float, and the diaphragm 1 (5) is circumferentially attached to the inner wall of the valve body 1 (1) or has a gap.

9. A damping constant flow valve as described in claim 1, characterized in that: A hollow support (60) is provided in the cavity (10) located outside the diaphragm (5), and the support (60) is arranged in a similar pattern to the diaphragm (5).

10. A damping constant flow valve as described in claim 1, characterized in that: A through hole is provided at the end of the valve body three (3) away from the diaphragm two (4), and the inner opening of the through hole forms an outlet (31) that cooperates with the valve core (7); or, a guide block (50) is installed at the inner opening of the through hole, and a hole coaxial with the through hole is provided on the guide block (50) to form an outlet (31), and also includes an insert (52) embedded in the guide block (50) for the valve core (7) to pass through and guide.

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