High filtration precision large damping pressure drop throttling device

Abstract

The utility model discloses a kind of high filtration precision big damping pressure drop throttling device, the device includes throttling seat and spiral throttling device, throttling seat inside is equipped with intercommunication flow channel, its import end is provided with filter unit to realize high-precision filtration, outlet end is provided with sealing unit and is sealed;Spiral throttling device is assembled in intercommunication flow channel, its outer spiral groove is formed spiral path flow channel with flow channel cooperation, rotation turbulence is generated when fluid flows through to realize big damping pressure drop.The utility model is through the multiple effect of "filtering first throttling" and "lengthening path+enhancing disturbance+high filtration precision", with high filtration precision, stable damping pressure drop and fast working condition response capability, applicable to hydraulic, precision lubrication and other need accurate pressure control scene.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, specifically to a high-filtration-precision, high-damping-pressure-drop throttling device. Background Technology

[0002] A throttle is a device used in hydraulic fluid systems to control the flow rate, pressure, or energy of fluids, especially in large reciprocating motion components. Currently, the most widely used throttle devices are orifice throttles and capillary throttles. Orifice throttles control flow rate or pressure by utilizing the local resistance of a small orifice, while capillary throttles utilize the flow resistance characteristics of a long, thin capillary tube. Both of these structures, in principle, can achieve the purpose of throttling and pressure reduction.

[0003] However, the characteristics of small-orifice flow restrictors are determined by their orifice diameter and length. Once manufactured, their flow resistance is essentially fixed, making it difficult to adapt to significant changes in system load, pressure, and other operating conditions. They also suffer from high sensitivity to media cleanliness and limited dynamic response. Similarly, the flow resistance of capillary flow restrictors is primarily determined by their pipe diameter and length. Once manufactured, the flow resistance is fixed, making it difficult to adjust the flow rate externally. They cannot adapt to significant changes in operating conditions and are prone to clogging and slow dynamic response. Therefore, there is an urgent need for a high-precision, high-damping pressure-drop flow restrictor. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a high-precision filtration device with large damping pressure drop throttling.

[0005] This utility model discloses a high-precision filtration device with large damping pressure drop throttling, comprising:

[0006] The throttle seat has a connecting channel running through it along its axial direction. One end of the connecting channel is the inlet end of the connecting channel, and the other end is the outlet end of the connecting channel. A filter unit is installed at the inlet end, and a sealing unit is installed near the outlet end. The sealing unit is used to seal the throttle seat with the external mounting structure.

[0007] A spiral throttle is assembled inside the connecting channel. A spiral groove is provided on its outer circumference along its axial direction. The spiral groove and the connecting channel cooperate to form a spiral path channel. When the fluid filtered by the filter unit flows through the spiral path channel, it generates rotational turbulence to achieve damping pressure drop.

[0008] As a further improvement of this utility model, the outer peripheral surface of the spiral throttle and the inner peripheral surface of the connecting channel are both conical surfaces, and their tapers are consistent, both being 1:30±0.02.

[0009] As a further improvement of this utility model, the outer diameter of the large taper end of the spiral throttle is smaller than the inner diameter of the large taper end of the connecting channel, and the difference between the two is 0.05 to 0.08 mm.

[0010] As a further improvement of this utility model, when high-pressure oil flows through the conical mating surface of the spiral throttle and the throttle seat, the pressure of the high-pressure oil drives the spiral throttle to move axially along the conical surface of the throttle seat, so that the tightness of the conical surface of the two increases with the increase of pressure, thereby achieving dynamic enhancement of sealing performance.

[0011] As a further improvement of this utility model, the length of the spiral throttle is 7-9 mm, and the total spiral length of the spiral groove is 10-11 turns.

[0012] As a further improvement of this utility model, the continuous concave section of the spiral groove constitutes a throttle channel, and the width and depth of the throttle channel are 0.3±0.06mm.

[0013] As a further improvement of this utility model, the filtration unit is a stainless steel filter element, which is welded and fixed to the inlet end of the throttle seat; the mesh size of the stainless steel filter element is in the range of 650 to 800 mesh.

[0014] As a further improvement of this utility model, the sealing unit is an O-ring, and a sealing groove is provided around the throttle seat near the outlet end. The O-ring is fitted inside the sealing groove and is used to seal the installation gap between the throttle seat and the external mounting structure.

[0015] As a further improvement of this utility model, the throttle seat has a threaded portion on the side near the inlet end, and the threaded portion cooperates with the external mounting structure to realize the installation of the throttle seat and the external mounting structure.

[0016] As a further improvement of this utility model, the end of the spiral throttle near the inlet end of the throttle seat is recessed to form a threaded hole for an auxiliary screw to be screwed in; by striking the auxiliary screw screwed into the threaded hole, the spiral throttle is installed into the throttle seat.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention utilizes a spiral throttling device, combined with a throttling device seat, to form a spiral flow path, forcing the fluid to flow along this path. Compared to the straight channels of orifice throttling devices and capillary throttling devices, the spiral path significantly extends the fluid flow path and allows the fluid to rotate during flow, creating stronger turbulence. This structural feature not only improves the pressure reduction effect of high-pressure fluids but also enhances the throttling disturbance, making the throttling effect more stable and adaptable to significant changes in system load, pressure, and other operating conditions. It also greatly improves the dynamic response speed, solving the problems of existing orifice throttling devices and capillary throttling devices having fixed flow resistance, making them difficult to adapt to changes in operating conditions, and having limited or slow dynamic responses.

[0019] This invention equips a filter unit at the inlet end of the throttle seat, which can perform high-precision filtration of the incoming fluid, effectively preventing tiny impurities from entering the spiral path flow channel and causing blockage, significantly improving the device's anti-clogging ability, ensuring the overall stable and reliable operation of the throttle, and making up for the shortcomings of existing small-hole throttles that are sensitive to the cleanliness of the medium and capillary throttles that are prone to clogging the flow channel.

[0020] In this invention, the spiral throttle and the throttle seat adopt a conical fit structure. During the process of passing high-pressure oil, as the working time increases and the oil pressure rises, the tightness of the fit between the two is improved, further ensuring the stability of the throttling and pressure reduction effect. Moreover, the overall device has a compact structure, occupies little space, and is easy to install in hydraulic pipeline systems with limited space. It is especially suitable for hydraulic fluid control scenarios of large reciprocating motion components, making it more practical. Attached Figure Description

[0021] Figure 1 This is a front view of the high filtration accuracy and large damping pressure drop throttling device disclosed in one embodiment of the present invention;

[0022] Figure 2 This is a side view of the structure of a high-filtration-precision, high-damping-pressure-drop throttling device disclosed in one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the spiral throttle of a high-filtration-precision, high-damping-pressure-drop throttling device disclosed in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the throttle seat of a high-filtration-precision, high-damping-pressure-drop throttle device disclosed in one embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram illustrating the application of a high-filtration-precision, high-damping-pressure-drop throttling device disclosed in one embodiment of this utility model.

[0026] In the picture:

[0027] 1. Throttling seat; 1-1. Connecting flow channel; 1-2. Sealing groove; 2. Spiral throttle; 2-1. M3 threaded hole; 2-2. Spiral groove; 3. Stainless steel filter element; 4. O-ring seal; 5. Sliding plate; 5-1. Oil inlet; 5-2. Oil inlet flow channel; 6. Marble; 7. High-pressure oil film. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings:

[0032] like Figure 1-2As shown, a high-filtration-precision, high-damping-pressure-drop throttling device according to this utility model includes: a throttling device seat 1, a spiral throttling device 2, a filter unit, and a sealing unit. The throttling device seat 1 has a connecting channel 1-1 extending through it along its axial direction. One end of the connecting channel 1-1 is the inlet end, and the other end is the outlet end. A filter unit is installed at the inlet end, and a sealing unit is installed near the outlet end. The sealing unit is used to seal the throttling device seat 1 against the external mounting structure. The spiral throttling device 2 is installed inside the connecting channel 1-1, and its outer circumference has a spiral groove 2-2 arranged along its axial direction. The spiral groove 2-2 and the connecting channel 1-1 cooperate to form a spiral path flow channel. When the fluid filtered by the filter unit flows through the spiral path flow channel, it generates rotating turbulence to achieve a damping pressure drop.

[0033] Specifically:

[0034] like Figure 3-4 As shown, in the above embodiment, preferably, the outer circumferential surface of the spiral throttle 2 and the inner circumferential surface of the connecting flow channel 1-1 are both conical surfaces, and their tapers are consistent, both being 1:30±0.02, in order to control the installation gap between the throttle seat 1 and the spiral throttle 2. In this embodiment, the outer diameter of the large taper end of the spiral throttle 2 is smaller than the inner diameter of the large taper end of the connecting flow channel 1-1, with a difference of 0.05 to 0.08 mm. By designing this difference, it is ensured that the spiral throttle 2 can be completely installed into the throttle seat 1. When high-pressure oil flows through the conical mating surface of the spiral throttle 2 and the throttle seat 1, the pressure of the high-pressure oil drives the spiral throttle 2 to move axially along the conical surface of the throttle seat 1, so that the tightness of the conical surface contact between the two increases with the increase of pressure, thereby achieving dynamic enhancement of sealing performance and achieving a better sealing effect.

[0035] In the above embodiments, preferably for the "sport skateboard 5 test" scenario, since the magnesium plate is prone to tilting and lifting during the test, causing the skateboard to become unbalanced, the throttling device must have the ability to "quickly respond to changes in flow rate and accurately adjust internal pressure" to drive the skateboard to quickly return to its original position. In this embodiment, to meet the above requirements, the length of the spiral throttling device 2 is preferably 7-9 mm, and the total spiral length of the spiral groove 2-2 is preferably 10-11 turns. Under this design, on the one hand, the spiral path significantly extends the flow channel length (10-11 turns of spiral make the actual flow channel length much greater than the axial length of the device), increasing the frictional resistance between the fluid and the wall; on the other hand, the rotational motion intensifies the relative motion of particles inside the fluid, enhances energy loss, and ultimately produces a "large damping pressure drop" (the pressure is significantly reduced after the high-pressure fluid flows through).

[0036] In the above embodiment, preferably, the continuous concave section of the spiral groove 2-2 constitutes a throttle channel, and the width and depth of the throttle channel are 0.3±0.06mm. This facilitates the processing and cleaning of the spiral groove 2-2.

[0037] In the above embodiments, preferably, the filter unit is a stainless steel filter element 3, which is welded and fixed to the inlet end of the throttle seat 1. The mesh size of the stainless steel filter element 3 is 650-800 mesh to ensure that impurities do not clog the throttle flow channel, while meeting the requirement that the filtration accuracy is not lower than the overall 40-micron filtration accuracy requirement of the hydraulic system. In this embodiment, the diameter of the stainless steel filter element 3 is φ8. The filter element diameter (φ8) should be designed to be smaller than the minor diameter of the throttle seat thread (M10) to ensure that the added filter element structure does not affect the screwing of the throttle seat 1 thread into the external mounting structure.

[0038] In the above embodiment, preferably, the sealing unit is an O-ring seal 4, and a sealing groove 1-2 is provided around the throttle seat 1 near the outlet end. The O-ring seal 4 is fitted inside the sealing groove 1-2, and the O-ring seal 4 is used to seal the installation gap between the throttle seat 1 and the external mounting structure. In this embodiment, the O-ring seal 4 has a specification of 8*1.8; the sealing groove 1-2 has a size of Φ8 and a width of 2.

[0039] In the above embodiments, preferably, the throttle seat 1 has an M10 threaded portion near the inlet end, which mates with the external mounting structure to enable the throttle seat 1 to be installed with the external mounting structure. In this embodiment, the inlet end is located at the large taper end of the connecting flow channel 1-1 of the throttle seat 1.

[0040] In the above embodiment, preferably, the end of the spiral throttle 2 near the inlet end of the throttle seat 1 has a recessed threaded hole for an auxiliary screw to be screwed into. This threaded hole is an M3 threaded hole 2-1. The auxiliary screw, preferably an M3 screw, is driven into the M3 threaded hole 2-1 by tapping. During assembly, the spiral throttle 2 is installed into the throttle seat 1. The M3 threaded hole 2-1 and the auxiliary screw effectively prevent damage to the spiral throttle 2 caused by tapping during installation. In this embodiment, the M3 threaded hole 2-1 is preferably located at the large taper end of the spiral throttle 2.

[0041] like Figure 5 As shown, in this embodiment, the external mounting structure is a motion slide plate 5, which has an oil inlet 5-1 and at least one M10 throttle mounting threaded hole; the oil inlet 5-1 is connected to the M10 throttle mounting threaded hole through an oil inlet channel 5-2; the assembly process in this embodiment is as follows:

[0042] Tighten the M3 screw into the M3 threaded hole 2-1 of the spiral throttle 2, and install the spiral throttle 2 into the connecting flow channel 1-1 of the throttle seat 1; use a small hammer to gently tap the M3 screw cap to ensure that the throttle is installed in place and locked. After assembly, rotate the M3 screw to remove it.

[0043] The φ8 stainless steel filter element 3 is welded to the M10 threaded end on the inlet side of the throttle seat 1 by laser welding.

[0044] Install the 8*1.8 O-ring 4 into the Φ8 wide 2 sealing groove 1-2 of the throttle seat 1 to achieve the thread sealing effect;

[0045] Tighten the assembled throttle body into the throttle mounting threaded hole of the moving slide plate 5 with oil inlet channel 5-2. At this time, the throttle seat 1 with spiral throttle 2 is fixed to the throttle mounting threaded hole of the moving slide plate 5 through the M10 threaded end. The O-ring seal 4 seals the gap between the throttle seat 1 and the throttle mounting threaded hole, thus completing the assembly of this device.

[0046] In the above embodiments, preferably, the working method in this embodiment is as follows:

[0047] The high-pressure oil circuit system is connected, and the high-pressure oil enters the oil inlet channel 5-2 through the oil inlet 5-1 of the moving slide plate 5;

[0048] High-pressure oil enters the stainless steel filter element 3 of this throttling device through the oil inlet channel 5-2 for filtration to remove impurities from the high-pressure oil and ensure that the subsequent spiral path channel is not blocked.

[0049] After being filtered by the stainless steel filter element 3, the high-pressure oil enters the spiral path flow channel formed by the spiral groove 2-2 and the connecting flow channel 1-1 through the inlet end of the throttle seat 1. At this time, the high-pressure oil is forced to flow along the spiral path, forming a rotating turbulent flow.

[0050] When high-pressure oil flows through the conical mating surface of the spiral throttle 2 and the connecting flow channel 1-1, the fluid pressure will drive the spiral throttle 2 to move axially toward the outlet end of the throttle seat 1, so that the tightness of the conical surfaces of the two is enhanced as the pressure increases.

[0051] After being transported through the spiral path channel, the oil enters the space between the marble 6 and the moving slide plate 5 through the outlet end of the throttle seat 1, and forms a high-pressure oil film 7 between the marble 6 and the moving slide plate 5.

[0052] Advantages of this utility model:

[0053] This invention, by setting a spiral throttle 2 and cooperating with the throttle seat 1 to form a spiral path flow channel, forces the fluid to flow along the spiral path. Compared with the straight channel of orifice throttles and capillary throttles, the spiral path significantly extends the fluid flow path and allows the fluid to rotate during flow, forming stronger turbulence. This structural feature not only improves the pressure reduction effect of high-pressure fluids but also enhances the throttling disturbance of the fluid, making the throttling effect more stable and adaptable to large changes in system load, pressure, and other operating conditions. At the same time, it greatly improves the dynamic response speed, solving the problems of existing orifice throttles and capillary throttles having fixed flow resistance that makes it difficult to adapt to changes in operating conditions and having limited or slow dynamic response.

[0054] This utility model equips a filter unit at the inlet end of the throttle seat 1, which can perform high-precision filtration of the incoming fluid, effectively prevent tiny impurities from entering the spiral path flow channel and causing blockage, significantly improve the device's anti-clogging ability, ensure the overall stable and reliable operation of the throttle, and make up for the shortcomings of existing small-hole throttles that are sensitive to the cleanliness of the medium and capillary throttles that are prone to clogging the flow channel.

[0055] In this utility model, the spiral throttle 2 and the throttle seat 1 adopt a conical fit structure. During the process of passing high-pressure oil, as the working time is extended and the oil pressure increases, the tightness of the fit between the two is improved, further ensuring the stability of the throttling and pressure reduction effect. Moreover, the overall device structure is compact and occupies little space, making it easy to install in hydraulic pipeline systems with limited space. It is especially suitable for hydraulic fluid control scenarios of large reciprocating motion components, making it more practical.

[0056] This invention achieves better pressure reduction, more stable throttling effect, and stronger anti-clogging capability for high-pressure fluids through multiple functions such as "lengthening the path, enhancing disturbance, and increasing filtration accuracy".

[0057] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-precision filtration device with large damping pressure drop throttling effect, characterized in that, include: The throttle seat has a connecting channel running through it along its axial direction. One end of the connecting channel is the inlet end of the connecting channel, and the other end is the outlet end of the connecting channel. A filter unit is installed at the inlet end, and a sealing unit is installed near the outlet end. The sealing unit is used to seal the throttle seat with the external mounting structure. A spiral throttle is assembled inside the connecting channel. A spiral groove is provided on its outer circumference along its axial direction. The spiral groove and the connecting channel cooperate to form a spiral path channel. When the fluid filtered by the filter unit flows through the spiral path channel, it generates rotational turbulence to achieve damping pressure drop.

2. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 1, characterized in that, The outer circumferential surface of the spiral throttle and the inner circumferential surface of the connecting channel are both conical surfaces, and their tapers are consistent, both being 1:30±0.

02.

3. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 2, characterized in that, The outer diameter of the large taper end of the spiral throttle is smaller than the inner diameter of the large taper end of the connecting channel, with a difference of 0.05 to 0.08 mm.

4. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 2, characterized in that, When high-pressure oil flows through the conical mating surface of the spiral throttle and the throttle seat, the pressure of the high-pressure oil drives the spiral throttle to move axially along the conical surface of the throttle seat, so that the tightness of the conical surfaces of the two increases with the increase of pressure, thereby achieving dynamic enhancement of sealing performance.

5. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 1, characterized in that, The length of the spiral throttle is 7-9 mm, and the total spiral length of the spiral groove is 10-11 turns.

6. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 1, characterized in that, The continuous concave section of the spiral groove forms a throttle channel, and the width and depth of the throttle channel are 0.3±0.06mm.

7. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 1, characterized in that, The filtration unit is a stainless steel filter element, which is welded and fixed to the inlet end of the throttle seat; the mesh size of the stainless steel filter element is 650 to 800 mesh.

8. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 1, characterized in that, The sealing unit is an O-ring. A sealing groove is provided around the throttle seat near the outlet end. The O-ring is fitted inside the sealing groove and is used to seal the installation gap between the throttle seat and the external mounting structure.

9. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 1, characterized in that, The throttle seat has a threaded portion on the side near the inlet end, which cooperates with the external mounting structure to realize the installation of the throttle seat with the external mounting structure.

10. The high-filtration-precision, high-damping-pressure-drop throttling device according to claim 1, characterized in that, The spiral throttle has a recessed threaded hole at one end near the inlet of the throttle seat for an auxiliary screw to be screwed into; the spiral throttle is installed into the throttle seat by striking the auxiliary screw screw that is screwed into the threaded hole.

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