High-precision high-pressure regulating valve capable of automatically eliminating reverse rotation gap and system for preparing edible salt from seawater

Abstract

The utility model provides a high-precision high-pressure regulating valve capable of automatically eliminating a reverse rotation gap and a system for preparing edible salt from seawater, and belongs to the technical field of regulating valves. According to the utility model, the servo motor is used, so that the flow regulation is high in precision, the pressure can be linearly regulated, the response speed is high, and manual or simple electric driving is not needed. The regulating valve is compact in overall structure, is suitable for a seawater edible salt preparation system integrated in a small space of a container, can be arranged to be horizontal or vertical according to needs, and meets the requirement for improving the space utilization rate. The axis directions of the worm gear and the worm are vertically designed, so that the regulating valve has a self-locking characteristic, the regulating amplitude of the regulating valve cannot be forced to be impacted and changed due to overhigh water pressure, and the regulating valve is simultaneously suitable for high-pressure and low-pressure working conditions. According to the utility model, the ball screw part is combined with the servo motor, so that the transmission back clearance is effectively eliminated, and the precision of flow regulation is improved.

Description

Technical Field

[0001] This utility model belongs to the field of regulating valve technology, specifically relating to a high-precision high-pressure regulating valve that automatically eliminates reverse rotation gap and a seawater-to-edible salt production system. Background Technology

[0002] Traditional methods for producing sea salt mainly include boiling, sun-drying, and spray evaporation. Each of these methods has its drawbacks. For example, boiling is only suitable for industrial salt production and is energy-intensive; sun-drying requires a large area and manpower, and has a long production cycle; spray evaporation also requires a large area and is energy-intensive. Therefore, to produce edible salt from seawater more efficiently and energy-savingly, and to fully utilize sea salt resources, a new type of seawater-to-edible-salt system is needed.

[0003] Currently, there is a membrane-based freshwater production system that can be used to collect, filter, and reverse osmosis seawater to obtain freshwater and concentrated seawater (salt water). This invention improves upon the aforementioned seawater-to-freshwater system to create a seawater-to-edible-salt system. Considering the convenience of transportation and deployment in practical use, the system is integrated into a single container. This new system requires flow control valves that work in conjunction with the ultrafiltration module and reverse osmosis membrane. While various flow control valves exist on the market, none are suitable for this new system.

[0004] The flow control valves currently on the market mainly have the following problems:

[0005] (1) Low adjustment accuracy: Traditional valves (such as ordinary gate valves and ball valves) rely on manual or simple electric drive. The mechanical transmission components have back clearance (such as the thread clearance of the lead screw), which leads to lag in the response when adjusting the flow rate and makes it difficult to achieve high-precision dynamic control.

[0006] (2) Insufficient pressure resistance: Under extreme working conditions of high pressure (6-15MPa) or low pressure (0-6MPa), the valve body sealing is prone to failure, which increases the risk of leakage. Especially under high flow impact, the valve core and valve seat are prone to wear, shortening the service life.

[0007] (3) Poor material corrosion resistance: In highly corrosive media environments such as seawater, valve bodies and transmission components made of ordinary stainless steel or cast iron are prone to pitting corrosion or stress corrosion cracking, leading to valve failure.

[0008] (4) Complex structure and difficult maintenance: Most existing control valves adopt a split design, and the connection between the transmission mechanism and the valve body is complicated. Disassembly and maintenance require shutdown, which affects the continuity of the system; in addition, the degree of modularity is low and the cost of component replacement is high.

[0009] (5) Dynamic response delay: Valves driven by ordinary motors are difficult to respond quickly to changes in flow due to inaccurate torque control and lack of real-time feedback mechanism, resulting in a decrease in system efficiency.

[0010] (6) Control error caused by backlash: The gaps in the mechanical transmission chain (such as the meshing gap between the worm and the worm wheel, and the gap between the lead screw and the nut) generate empty strokes during reverse movement, which leads to the accumulation of flow regulation error and affects the stability of process parameters.

[0011] (7) Existing flow control valves are bulky and not suitable for the seawater salt production system integrated into the small space of the container, thus taking up too much space. Utility Model Content

[0012] This invention was developed to solve the above-mentioned problems, and aims to provide a high-precision high-pressure regulating valve that automatically eliminates the backlash of reverse rotation and a seawater-based edible salt production system.

[0013] This utility model provides a high-precision, high-pressure regulating valve that automatically eliminates backlash during reverse rotation. It comprises: a servo motor; a worm gear, driven directly or indirectly by the servo motor to rotate, having helical teeth; a worm wheel, whose peripheral wall has grooves that mesh with the helical teeth, the worm wheel's axis perpendicular to the worm's axis, the worm wheel's position fixed, and the worm wheel rotating around its own axis driven by the worm; a ball screw section, passing through and partially integrated with the worm wheel, the worm wheel rotating around its own axis indirectly driving the ball screw section to move along its length; and a stop valve, whose valve core is connected to the ball screw and... It drives axial displacement. The two relative directions of the valve core's axial displacement are denoted as the first direction and the second direction, respectively. When the valve core moves towards the first direction, the opening degree of the shut-off valve decreases. When the valve core moves towards the second direction, the opening degree of the shut-off valve increases. The water flow in the inlet channel of the shut-off valve gives the valve core a force in the second direction, which causes the lead screw to indirectly press the worm gear in the axial direction. This causes the balls in the ball screw section to move slightly, thereby creating axial preload between the lead screw and the worm gear and eliminating the error caused by the axial clearance between them when the worm gear drives the lead screw to move in the opposite direction. Finally, high-precision adjustment of the valve core is achieved.

[0014] The high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap provided by this utility model may also have the following features: the shut-off valve includes: a valve body having an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe having an inlet flow channel and an outlet flow channel respectively, the inlet flow channel and the outlet flow channel intersecting; and a valve core, the valve core being connected to a lead screw and driven by it to move along its length direction and at least partially passing through the inlet flow channel, such that the valve cone of the valve core has different degrees of blockage at the intersection of the inlet flow channel and the outlet flow channel, thereby changing the flow rate of the outlet flow channel, the maximum radial outer diameter of the valve cone being at least 0.01mm to 0.2mm smaller than the inner diameter of the inlet flow channel.

[0015] The high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap provided by this utility model may also have the following features: wherein the valve body includes: a connecting unit for the valve core having a valve cone end to pass through, and the passage is sealed; a water inlet unit including a water inlet pipe communicating with the connecting unit; and a water outlet unit including a water outlet pipe communicating with the side wall of the connecting unit.

[0016] The high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap provided by this utility model may also have the following features: the valve body includes: a transition unit for the valve core having a valve cone end inserted through; a connecting unit including a first connecting section, a radial water outlet section, and a second connecting section, the first connecting section communicating with the transition unit, the radial water outlet section communicating with the first connecting section and having an outer diameter smaller than the outer diameter of the first connecting section, the peripheral wall of the radial water outlet section having several openings, the second connecting section communicating with the radial water outlet section and having an outer diameter larger than the outer diameter of the radial water outlet section; a water inlet unit including a water inlet pipe communicating with the second connecting section; and a water outlet unit including a rotating component and a water outlet pipe, the rotating component being rotatably ring-fixed on the radial water outlet section and clamped together by the transition unit and the second connecting section, the rotating component and the water outlet pipe communicating.

[0017] The high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap provided by this utility model may also have the following features: the valve core and the lead screw are detachably threaded; the first connecting section and the transfer unit are detachably threaded and sealed by a sealing ring; the rotating part and the transfer unit are sealed by a sealing ring; the rotating part and the second connecting section are sealed by a sealing ring; the rotating part and the outlet pipe are detachably threaded; and the inlet pipe and the second connecting section are detachably threaded.

[0018] The high-precision high-pressure regulating valve for automatically eliminating reverse rotation clearance provided by this utility model may also have the following features: the ball screw part includes: a first threaded groove, which is coiled and recessed in the through hole of the worm gear through which the ball screw part passes; a return ball channel, the inlet and outlet of which are both located in the through hole, and the inlet and outlet of the return ball channel are respectively connected to the two ends of the first threaded groove; a screw, which passes through the through hole; an anti-rotation ring, which is fixed in position and does not rotate itself, and passes through the end of the screw away from the shut-off valve to prevent the screw from being driven by the worm gear to rotate around its own axis; a second threaded groove, which is coiled and recessed in the peripheral wall of the screw and matches the first threaded groove; and a number of balls, some of which are clamped by the first threaded groove and the second threaded groove together, and the other part is embedded in the return ball channel in a row. When the worm gear rotates around its own axis, the screw is indirectly driven to move along its length direction through the balls clamped between the first threaded groove and the second threaded groove.

[0019] The high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap provided by this utility model may also include the following features: a housing, serving as the outer shell of the drive unit; and a bearing seat, disposed at the upper opening of the housing; a worm gear disposed in the internal space formed by the housing and the bearing seat; the upper and lower ends of the worm gear axially indirectly abutting against the lower surface of the bearing seat and the bottom of the housing through thrust bearings, respectively, so that it will not produce axial displacement when rotating around its own axis; and a lead screw passing through the bottom of the housing to connect with the valve core.

[0020] The high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap provided by this utility model may also have the following features: the cylindrical outer surface of the worm wheel has several worm wheel teeth, the extension direction of the worm wheel teeth is parallel to the cylindrical central axis of the worm wheel, and a tooth groove that matches and meshes with the helical teeth is formed between two adjacent worm wheel teeth. The rotation of the worm causes the helical teeth to advance along the axial direction of the worm, thereby forming a continuous line contact with the worm wheel teeth and forcing the worm wheel to rotate around its own central axis. Each worm wheel tooth includes straight tooth sections at both ends and an arc-shaped tooth section in the middle that is recessed into the worm wheel. The curvature of the bottom of the tooth groove is the same as the curvature of the helical teeth, and the inner chamfer of the side wall of the tooth groove matches the outer chamfer of the helical teeth.

[0021] The high-precision high-pressure regulating valve that automatically eliminates reverse rotation gap provided by this utility model may also have the following features: the shut-off valve is made of duplex steel, the worm gear is made of stainless steel, and the worm wheel is made of brass.

[0022] This utility model also provides a seawater-to-edible-salt system, which uses a high-precision, high-pressure regulating valve that automatically eliminates reverse rotation gaps, as described above, and is integrated into a container.

[0023] Functions and effects of utility models

[0024] According to this utility model, a high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap and a seawater-based edible salt production system are disclosed. The high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap includes: a servo motor; a worm gear, directly or indirectly driven by the servo motor to rotate, having helical teeth; a worm wheel, its peripheral wall having tooth grooves that mesh with the helical teeth, the worm wheel's axis direction being perpendicular to the worm gear's axis direction, the worm wheel's position being fixed, and the worm wheel being driven by the worm gear to rotate around its own axis; a ball screw section, passing through and partially integrated with the worm wheel, the worm wheel rotating around its own axis thereby indirectly driving the ball screw section to displace along its length direction; and a cut-off section. The stop valve has a valve core connected to a lead screw, which drives the valve core to move axially. The two opposing directions of the valve core's axial displacement are designated as the first direction and the second direction. When the valve core moves towards the first direction, the valve's opening degree decreases; when it moves towards the second direction, the valve's opening degree increases. The water flow in the valve's inlet channel exerts a force on the valve core in the second direction, causing the lead screw to indirectly press against the worm gear axially. This causes a slight displacement of the balls in the ball screw section, resulting in axial preload between the lead screw and the worm gear. This eliminates the error caused by the axial clearance between them when the worm gear reverses the lead screw's movement, ultimately achieving high-precision adjustment of the valve core. This high-precision, high-pressure regulating valve, which automatically eliminates reverse rotation clearance, is used in a seawater-based edible salt production system and integrated into a container.

[0025] Therefore, this utility model has the following beneficial effects:

[0026] (1) Using a servo motor can make the flow regulation extremely accurate, with linear pressure adjustment and fast response speed, without relying on manual or simple electric drive (no manufacturer has used a servo motor in the control valve under the current technology).

[0027] (2) The high-precision high-pressure regulating valve of this utility model with automatic elimination of reverse rotation gap has a compact overall structure. It is suitable for seawater edible salt production system integrated in the small space of a container and can be set as horizontal or vertical as needed to meet the need to improve space utilization in the narrow space of the container.

[0028] (3) The vertical axis design of the worm gear makes the regulating valve self-locking and will not be forced to change the regulating range due to excessive water pressure, making it suitable for both high pressure (6-15MPa) and low pressure (0-6MPa) working conditions.

[0029] (4) The combination of the ball screw and the servo motor can effectively eliminate transmission backlash, thereby improving the accuracy of flow regulation.

[0030] (5) A seawater salt production system using a high-precision high-pressure regulating valve that automatically eliminates the backlash of reverse rotation is linked with a servo motor to meet the real-time flow adjustment requirements. Attached Figure Description

[0031] Figure 1 This is a perspective view of the high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap according to Embodiment 1 of this utility model;

[0032] Figure 2 This is a cross-sectional view of the high-precision high-pressure regulating valve that automatically eliminates reverse rotation clearance according to Embodiment 1 of this utility model;

[0033] Figure 3 This is a perspective view of the high-precision high-pressure regulating valve with automatic elimination of reverse rotation gap in Embodiment 1 of this utility model at the drive unit position;

[0034] Figure 4 yes Figure 2 Enlarged view of region A in the middle;

[0035] Figure 5 This is a perspective view of the connection unit of Embodiment 1 of this utility model;

[0036] Figure 6 This is a perspective view of the high-precision high-pressure regulating valve that automatically eliminates reverse rotation gap according to Embodiment 2 of this utility model. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate a high-precision high-pressure regulating valve for automatically eliminating reverse rotation gaps and a seawater-based edible salt production system of this utility model.

[0038] <Example 1>

[0039] Figure 1 This is a perspective view of the high-precision high-pressure regulating valve that automatically eliminates reverse rotation gap according to Embodiment 1 of this utility model.

[0040] like Figure 1 As shown, this embodiment provides a high-precision high-pressure regulating valve 60 that automatically eliminates the backlash of reverse rotation. It is installed in the pipeline of the seawater salt production system and is used to regulate the flow rate in the pipeline. The seawater salt production system has a main control device.

[0041] The high-precision high-pressure regulating valve 60, which automatically eliminates backlash, includes a drive unit 61 and a shut-off valve 62.

[0042] Figure 2 This is a cross-sectional view of a high-precision high-pressure regulating valve that automatically eliminates reverse rotation clearance according to Embodiment 1 of this utility model.

[0043] like Figure 1 and Figure 2 As shown, the drive unit 61 includes a housing 611, a bearing housing 612, a dust cover 613, a worm gear 614, a servo motor 615, a worm 616, a ball screw part 617, and a sensor (not shown in the figure).

[0044] The housing 611 serves as the outer shell of the transmission part in the drive unit 61, and its material is stainless steel. The housing 611 has an opening.

[0045] The bearing housing 612 is provided at the opening on the housing 611 and has a through passage thereon.

[0046] The dust cover 613 is bolted to the bearing housing 612 to prevent dust and other foreign objects from falling into the housing 611 through the opening on the housing 611 and / or the channel of the bearing housing 612. The dust cover 613 is made of stainless steel.

[0047] Figure 3 This is a perspective view of the high-precision high-pressure regulating valve with automatic elimination of reverse rotation gap in Embodiment 1 of this utility model at the drive unit position.

[0048] like Figures 1-3 As shown, the worm gear 614 is disposed in the internal space formed by the housing 611 and the bearing seat 612. The upper and lower ends of the worm gear 614 are indirectly abutted to the lower surface of the bearing seat 612 and the bottom of the housing 611 through the thrust bearing 1, so that it will not produce axial displacement when rotating around its own axis.

[0049] The cylindrical outer surface of the worm gear 614 has a plurality of worm gear teeth 614a, the extending direction of which is parallel to the cylindrical central axis of the worm gear 614, and a tooth groove 614b is formed between each pair of adjacent worm gear teeth 614a. Each worm gear tooth 614a includes straight tooth sections 2 at both ends and an arc-shaped tooth section 3 in the middle that is recessed into the worm gear 614. In this embodiment, the worm gear 614 is made of brass.

[0050] The servo motor 615 is mounted on the side wall of the housing 611, and its drive shaft passes through the interior of the housing 611. The servo motor 615 has a controller, which is connected to the main control unit and receives its commands to adjust the output torque of the drive shaft of the servo motor 615.

[0051] The worm gear 616 is directly connected to the power shaft of the servo motor 615 and is driven by it to rotate around its own axis. The worm gear 616 has helical teeth 616a, the curvature of which is the same as the curvature of the bottom of the tooth groove 614b, and the outer chamfer of the helical teeth 616a matches the inner chamfer of the sidewall of the tooth groove 614b. In this embodiment, the worm gear 616 is made of stainless steel.

[0052] The worm 616 is located inside the housing 611 and next to the worm wheel 614. The worm 616 meshes with the tooth groove 614b through the helical teeth 616a. The rotation of the worm 616 causes the helical teeth 616a to advance along the axial direction of the worm 616, thereby forming a continuous line contact with the worm wheel teeth 614a and forcing the worm wheel 614 to rotate around its own central axis.

[0053] In this embodiment, the length direction of the power shaft of the servo motor 615 and the worm gear 616 is referred to as the first direction.

[0054] Figure 4 yes Figure 2 A magnified view of region A in the middle.

[0055] like Figures 1-4 As shown, the ball screw section 617 includes a first threaded groove, a ball return channel, a screw 6171, an anti-rotation ring 6172, a second threaded groove, and a ball 6173.

[0056] The first thread groove (groove-shaped thread structure) is coiled and recessed in the through hole of the worm gear 614 through which the ball screw part 617 passes.

[0057] The inlet and outlet of the ball return channel are both located in the through hole of the central axis of the worm gear 614, and the inlet and outlet of the ball return channel are respectively connected to the two ends of the first thread groove.

[0058] The lead screw 6171 passes through the central axis through hole of the worm gear 614. In this embodiment, the axial direction of the worm gear 614 and the lead screw 6171 is referred to as the second direction, and the first direction is perpendicular to the second direction. The entire high-precision high-pressure regulating valve 60, which automatically eliminates reverse rotation backlash, has a horizontal structure.

[0059] In this embodiment, the horizontal high-precision high-pressure regulating valve 60 with automatic elimination of reverse rotation gap has a compact overall structure, is suitable for seawater salt production systems integrated in the small space of a container, and has a stable center of gravity, will not tip over due to vibration, and can effectively reduce the space occupied in the vertical direction.

[0060] The anti-rotation ring 6172 is held by the bearing housing 612 and the dust cover 613, and is used to allow the end of the lead screw 6171 away from the shut-off valve 62 to pass through and prevent the lead screw 6171 from rotating around its own axis when it is displaced along its length.

[0061] The second threaded groove is recessed and arranged around the circumferential side wall of the lead screw 6171 and matches the first threaded groove.

[0062] The number of balls 6173 is several. Some of them are clamped by the first thread groove and the second thread groove and are embedded in a row therein. Others are embedded in a row in the ball return channel.

[0063] When the worm gear 614 rotates around its own axis, it indirectly drives the lead screw 6171 to move along its length direction through the ball 6173 held between the first and second threaded grooves (the ball 6173 simultaneously circulates back and forth in the track formed by the first and second threaded grooves through the return ball channel).

[0064] The sensor (not shown in the figure) is a proximity sensor, located in the internal space formed by the dust cover 613 and the bearing housing 612, and above the end of the lead screw 6171 that passes through the anti-rotation ring 6172. It is used to detect the displacement distance of the lead screw 6171 along its axial direction. The sensor is connected to the controller, and the controller adjusts the output torque of the power shaft of the servo motor 615 based on the sensor data.

[0065] The shut-off valve 62 includes a shut-off valve core 620 and a shut-off valve body. Both the shut-off valve core 620 and the shut-off valve body are made of duplex steel.

[0066] The shut-off valve core 620 is threadedly connected to the end of the lead screw 6171 away from the anti-rotation ring 6172, and its valve cone 620a passes through the bottom of the housing 611. The shut-off valve core 620 is driven by the lead screw 6171 to move along its length direction.

[0067] The shut-off valve body includes a transition unit 621, a connection unit 622, an inlet unit 623, and an outlet unit 624.

[0068] The adapter unit 621 is an adapter flange, located at the bottom opening of the housing 611, and fixed to the bottom of the housing 611 by bolts. The adapter unit 621 and the housing 611 are sealed by a sealing ring. The valve core 620 has one end with a valve cone 620a that movably passes through the adapter unit 621.

[0069] Figure 5 This is a perspective view of the connection unit of Embodiment 1 of this utility model.

[0070] like Figures 1-5 As shown, the connecting unit 622 includes a first connecting section 6221, a radial water outlet section 6222, and a second connecting section 6223.

[0071] The outer diameter of the first connecting section 6221 is smaller than the outer diameter of the adapter unit 621. The first connecting section 6221 and the adapter unit 621 are fixed and connected by a threaded detachable screw connection, and the screw connection is sealed by several sealing rings.

[0072] The outer diameter of the radial water outlet section 6222 is the same as that of the first connecting section 6221 and is integrally connected to it. The peripheral wall of the radial water outlet section 6222 has a number of water outlet holes 4.

[0073] The outer diameter of the second connecting section 6223 is larger than the outer diameter of the radial water outlet section 6222, and it is integrally connected with the connecting section 6223.

[0074] The water inlet unit 623 is a water inlet pipe with an annular valve seat 623a at one end. The end of the water inlet unit 623 with the valve seat 623a is detachably screwed to the second connecting section 6223, and the inner diameter of the valve seat 623a is at most 0.01mm to 0.2mm larger than the maximum outer diameter of the valve cone 620a. The water inlet unit 623 has a water inlet channel 623b inside, which communicates with the second connecting section 6223.

[0075] In this embodiment, the main body of the water inlet unit 623 is sealed with the second connecting section 6223 by a sealing ring, and the valve seat 623a at its end is also sealed with the second connecting section 6223 by a sealing ring.

[0076] The water outlet unit 624 includes a rotating component 6241 and a water outlet pipe 6242.

[0077] The rotating component 6241 is rotatably ring-fixed onto the radial water outlet section 6222 and is clamped together by the adapter unit 621 and the second connecting section 6223. The rotating component 6241 and the radial water outlet section 6222 are connected through the water outlet hole 4. The rotating component 6241 is sealed to the adapter unit 621 by a sealing ring, and the rotating component 6241 is sealed to the second connecting section 6223 by a sealing ring.

[0078] The outlet pipe 6242 is detachably screwed to the side wall of the rotating component 6241 by a thread and sealed by a sealing ring. The outlet pipe 6242 has an outlet channel 6242a inside, which communicates with the internal space of the rotating component 6241.

[0079] The high-precision high-pressure regulating valve 60 in this embodiment, which automatically eliminates reverse rotation clearance, is suitable for both high-pressure (6-15MPa) and low-pressure (0-6MPa) operating conditions. Its operation process is as follows:

[0080] S10, the servo motor 615 operates, driving the worm 616 to rotate around its own axis. The rotation of the worm 616 causes the helical teeth 616a to advance along the axial direction of the worm 616, thereby forming continuous line contact with the worm wheel teeth 614a and forcing the worm wheel 614 to rotate around its own central axis.

[0081] S20, one end of the lead screw 6171 passes through the anti-rotation ring 6172, so it will not rotate around its own axis; the worm gear 614 rotates around its own central axis, and through the threaded connection with the lead screw 6171, it drives the lead screw 6171 to move along its length direction.

[0082] S30, after the lead screw 6171 is displaced along its length, it drives the shut-off valve core 620 and its valve cone 620a to move in the internal space formed by the radial water outlet section 6222, the second connecting section 6223, the valve seat 623a and the water inlet unit 623. This changes the degree of blockage of the valve cone 620a at the intersection of the water inlet channel 623b and the water outlet channel 6242a, thereby ultimately changing the flow rate of the water input from the water inlet channel 623b when it is output from the water outlet channel 6242a.

[0083] During the above steps S10 to S30, the controller of the servo motor 615 adjusts the torque of the output shaft of the servo motor 615 by detecting the displacement distance of the lead screw 6171 by the sensor.

[0084] In steps S10 to S30 above, when the adjustment range of the servo motor 615 is too large or too small, and this is detected by the sensor, the controller controls the servo motor 615 to output torque in the opposite direction. At this time, the water flow in the inlet channel 623b gives the shut-off valve core 620 an axial force toward the anti-rotation ring 6172, thereby causing the lead screw 6171 to be pressed axially toward the anti-rotation ring 6172, driving the ball 6173 to make a small displacement in the track formed by the first thread groove and the second thread groove (the ball 6173 simultaneously circulates through the return ball channel). Compared with the ordinary threaded connection, the ball screw structure in this embodiment utilizes the force given by the water flow in the inlet channel 623b under the shut-off valve structure, and causes the lead screw 6171 and the worm gear 614 to be axially pre-tightened, eliminating the backlash during the relative displacement process of the lead screw 6171 and the worm gear 614, thus reducing the adjustment error.

[0085] This embodiment also provides a seawater-to-edible-salt system, including a main control device, an ultrafiltration module, a primary RO module, a secondary RO module, a flow meter, and a high-precision high-pressure regulating valve 60 that automatically eliminates reverse rotation gaps.

[0086] The ultrafiltration module, the primary RO module, and the secondary RO module are connected in sequence.

[0087] Two flow meters are installed, one on the pipeline connecting the ultrafiltration module and the first-stage RO module, and the other on the pipeline connecting the first-stage RO module and the second-stage RO module. The flow meters are connected to the main control unit.

[0088] A high-precision high-pressure regulating valve 60 that automatically eliminates reverse rotation gap is installed between the ultrafiltration module and the first-stage RO module and / or between the first-stage RO module and the second-stage RO module. The controller of the high-precision high-pressure regulating valve 60 that automatically eliminates reverse rotation gap is connected to the main control device.

[0089] The main control unit issues dynamic commands to the controller based on the flow meter's measurement value to dynamically control the opening and closing degree of the shut-off valve 62.

[0090] <Example 2>

[0091] Figure 6 This is a perspective view of the high-precision high-pressure regulating valve that automatically eliminates reverse rotation gap according to Embodiment 2 of this utility model.

[0092] like Figure 6 As shown, this embodiment provides a high-precision high-pressure regulating valve 60a that automatically eliminates reverse rotation gap, including a drive unit 61 and a shut-off valve 62.

[0093] The high-precision high-pressure regulating valve 60a that automatically eliminates the backlash of the reverse rotation in this embodiment is generally similar in structure to the high-precision high-pressure regulating valve 60 that dynamically eliminates the backlash of the reverse rotation in Embodiment 1. The only difference is that the drive unit 61 also includes a reduction gearbox sf.

[0094] The gearbox SF is located below the servo motor 615, and its power input shaft is connected to and powered by the power output shaft of the servo motor 615. The power input shaft and output shaft of the gearbox SF are at a 90° angle. The direction of the connection between the servo motor 615 and the gearbox SF is denoted as the first direction.

[0095] The direction of the line connecting the lead screw 6171 in the drive unit 61 to the reduction gearbox sf is denoted as the second direction; the direction of the line connecting the lead screw 6171 to the shut-off valve 62 is denoted as the third direction. The first direction and the third direction are parallel to each other, and the second direction is perpendicular to the first direction and the third direction, so that the components in the high-precision high-pressure regulating valve 60a that automatically eliminates reverse rotation gap are arranged vertically in sequence.

[0096] The high-precision high-pressure regulating valve 60a in this embodiment, which automatically eliminates the backlash of the reverse rotation, has a compact overall structure and is suitable for seawater salt production systems integrated in the small space of a container (vertical arrangement reduces the lateral space occupied).

[0097] The role and effect of the embodiments

[0098] According to this embodiment, a high-precision high-pressure regulating valve that automatically eliminates reverse rotation gap is provided. It is installed in the pipeline of a seawater-to-salt production system and used to regulate the flow rate in the pipeline. The seawater-to-salt production system has a main control device, which includes: a servo motor with a controller connected to the main control device and receiving its commands to adjust the output torque of the servo motor; a worm gear, driven directly or indirectly by the servo motor, having helical teeth; a worm wheel, whose peripheral wall has grooves that mesh with the helical teeth, the worm wheel's axis perpendicular to the worm's axis, the worm wheel's position fixed, and the worm wheel rotating around its own axis driven by the worm; and a ball screw section that passes through and is partially integrated with the worm wheel, the worm wheel rotating around its own axis... The ball screw is indirectly driven to move along its length; and the valve core is connected to the ball screw and driven to move axially. The two relative directions of the axial displacement of the valve core are referred to as the first direction and the second direction. When the valve core moves towards the first direction, the opening degree of the valve core decreases. When the valve core moves towards the second direction, the opening degree of the valve core increases. The water flow in the inlet channel of the valve core gives the valve core a force in the second direction, which causes the ball screw to indirectly press the worm gear in the axial direction, causing the balls in the ball screw to move slightly. This results in axial preload between the ball screw and the worm gear and eliminates the error caused by the axial clearance between them when the worm gear drives the ball screw to move in the opposite direction, ultimately achieving high-precision adjustment of the valve core.

[0099] Therefore, the high-precision high-pressure regulating valve that automatically eliminates reverse rotation clearance in this embodiment has the following beneficial effects:

[0100] (1) Using a servo motor with a controller can make the flow regulation extremely accurate, with linear pressure adjustment and fast response speed, without relying on manual or simple electric drive (no manufacturer has used servo motors in regulating valves under the current technology).

[0101] (2) The high-precision high-pressure regulating valve of this embodiment with automatic elimination of reverse rotation gap has a compact overall structure, is suitable for seawater edible salt production system integrated in the small space of a container, and can be set to horizontal or vertical as needed to meet the need to improve space utilization in the narrow space of the container.

[0102] (3) The vertical axis design of the worm gear makes the regulating valve self-locking and will not be forced to change the regulating range due to excessive water pressure, making it suitable for both high pressure (6-15MPa) and low pressure (0-6MPa) working conditions.

[0103] (4) The combination of the ball screw and the servo motor can effectively eliminate transmission backlash, thereby improving the accuracy of flow regulation.

[0104] Furthermore, the shut-off valve includes: a valve body having an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe having an inlet flow channel and an outlet flow channel respectively, the inlet flow channel and the outlet flow channel intersecting; and a valve core, the valve core being connected to a lead screw and driven by the lead screw to move along its length direction and at least partially passing through the inlet flow channel, such that the valve core's valve cone has different degrees of blockage at the intersection of the inlet flow channel and the outlet flow channel, thereby changing the flow rate of the outlet flow channel, the maximum radial outer diameter of the valve cone being at least 0.01mm to 0.2mm smaller than the inner diameter of the inlet flow channel. This design gives the control valve extremely high adjustment accuracy. Flow rate can be adjusted by controlling the axial displacement of the shut-off valve core. At the same time, the taper of the valve cone can be adjusted according to actual needs. The smaller the taper of the valve cone, the greater the accuracy of flow rate adjustment, thus meeting the high precision requirements of flow rate regulation. Furthermore, the anti-rotation ring ensures that the lead screw only makes axial displacement and does not rotate around its own axis, thereby reducing energy loss in the worm gear drive process (preventing the lead screw from being driven by the worm gear to rotate around its axis).

[0105] Furthermore, the valve body includes: a transition unit for the valve core with the valve cone end to pass through; a connecting unit including a first connecting section, a radial water outlet section, and a second connecting section, wherein the first connecting section communicates with the transition unit, the radial water outlet section communicates with the first connecting section and its outer diameter is smaller than that of the first connecting section, the peripheral wall of the radial water outlet section has several openings, the second connecting section communicates with the radial water outlet section and its outer diameter is larger than that of the radial water outlet section; a water inlet unit including a water inlet pipe communicating with the second connecting section; and a water outlet unit including a rotating component and a water outlet pipe, wherein the rotating component is rotatably fixed to the radial water outlet section and clamped by the transition unit and the second connecting section, and the rotating component and the water outlet pipe are communicating. This configuration allows the water outlet pipe of the water outlet unit to rotate 360° around the axial direction of the connecting unit, meeting the needs of applying a regulating valve in a small space (the container housing the seawater-to-salt system has a compact structure, requiring minimal space wastage).

[0106] Furthermore, the valve core and the lead screw are detachably threaded together; the first connecting section and the adapter unit are detachably threaded together and sealed by a sealing ring; the rotating part and the adapter unit are sealed by a sealing ring; the rotating part and the second connecting section are sealed by a sealing ring; the rotating part and the outlet pipe are detachably threaded together; and the inlet pipe and the second connecting section are detachably threaded together. This design ensures high sealing performance for all components while allowing for detachable connections, supporting quick replacement and effectively reducing downtime for maintenance.

[0107] Furthermore, the ball screw section includes: a first threaded groove, which is coiled and recessed in the through hole of the worm gear through which the ball screw section passes; a return ball channel, the inlet and outlet of which are both located in the through hole, and the inlet and outlet of the return ball channel are respectively connected to the two ends of the first threaded groove; a screw, which passes through the through hole; an anti-rotation ring, which is fixed in position and does not rotate itself, and passes through the end of the screw away from the shut-off valve to prevent the screw from being driven by the worm gear to rotate around its own axis; a second threaded groove, which is coiled and recessed on the peripheral wall of the screw and matches the first threaded groove; and a number of balls, some of which are clamped by the first threaded groove and the second threaded groove together, and the other part is embedded in the return ball channel in a row. When the worm gear rotates around its own axis, the screw is indirectly driven to move along its length direction through the balls clamped between the first threaded groove and the second threaded groove. This configuration ensures that before the flow valve adjusts the flow rate (by controlling the servo motor to drive the worm gear to rotate), the water flow in the inlet channel applies an axial force to the shut-off valve core towards the anti-rotation ring. This causes the lead screw to press axially towards the anti-rotation ring, resulting in a slight displacement of the ball bearings. Consequently, the lead screw and worm gear are pre-tightened axially, eliminating backlash during the relative displacement process between the lead screw and worm gear.

[0108] Furthermore, the high-precision high-pressure regulating valve that automatically eliminates reverse rotation gap also includes: a housing, serving as the outer shell of the drive unit; and a bearing seat, located at the upper opening of the housing, with the worm gear positioned within the internal space formed by the housing and the bearing seat. The upper and lower ends of the worm gear axially are indirectly abutted against the lower surface of the bearing seat and the bottom of the housing via thrust bearings, respectively, so that it will not generate axial displacement when rotating around its own axis. The lead screw passes through the bottom of the housing and is connected to the valve core; and a sensor, used to detect the axial displacement amplitude of the lead screw. The sensor is connected to the controller, and the controller adjusts the torque of the servo motor based on the sensor data. This configuration has the following beneficial effects: (1) The housing protects against external contaminants from affecting the worm gear transmission structure; (2) The thrust bearing can fix the worm gear (preventing its axial displacement) while reducing the energy loss of its rotation around its own axis; (3) The controller can precisely control the axial displacement or rotation of the transmission component based on the displacement or angle detection data from the sensor, providing real-time feedback to improve the efficiency and accuracy of flow regulation. This avoids the problem of inaccurate torque control due to the lack of a real-time feedback mechanism.

[0109] Furthermore, the cylindrical outer surface of the worm gear has several worm gear teeth, the extension direction of which is parallel to the cylindrical central axis of the worm gear. Between each pair of adjacent worm gear teeth, a tooth groove is formed that meshes with the helical teeth. The rotation of the worm causes the helical teeth to advance axially along the worm, thus forming continuous line contact with the worm gear teeth and forcing the worm gear to rotate around its own central axis. Each worm gear tooth includes straight tooth sections at both ends and an arc-shaped tooth section in the middle that is recessed into the worm gear. The curvature of the bottom of the tooth groove is the same as the curvature of the helical teeth, and the inner chamfer of the sidewall of the tooth groove matches the outer chamfer of the helical teeth. This design effectively avoids backlash generated during reverse transmission of the worm gear, effectively improving transmission efficiency.

[0110] Furthermore, the gate valve is made of duplex steel, the worm gear is made of stainless steel, and the worm wheel is made of brass. This design allows the valve body to withstand seawater corrosion over a long period, making it more suitable for brine flow regulation in seawater-to-salt production systems.

[0111] This embodiment also provides a seawater-to-edible-salt system, which uses a high-precision, high-pressure regulating valve that automatically eliminates reverse rotation gaps, as described above, and is integrated into a container. The system includes: a main control unit; an ultrafiltration module, a primary RO module, and a secondary RO module connected in sequence; a flow meter installed on the pipeline connecting the ultrafiltration module, the primary RO module, and the secondary RO module, and connected to the main control unit; and a high-precision, high-pressure regulating valve that automatically eliminates reverse rotation gaps, installed between the ultrafiltration module and the primary RO module and / or between the primary RO module and the secondary RO module. The controller of the high-precision, high-pressure regulating valve that automatically eliminates reverse rotation gaps is connected to the main control unit. The main control unit issues dynamic commands to the controller based at least on the flow meter's measurement value to dynamically control the opening and closing degree of the shut-off valve.

[0112] Therefore, the seawater salt production system in this embodiment, which uses a high-precision high-pressure regulating valve that automatically eliminates the backlash of reverse rotation, is linked with a flow meter and a servo motor to meet the requirements for real-time high-precision flow adjustment.

[0113] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-precision, high-pressure regulating valve that automatically eliminates backlash during reverse rotation, characterized in that, include: Servo motor; The worm gear, which is driven to rotate directly or indirectly by the servo motor, has helical teeth on it; The worm wheel has grooves on its peripheral sidewall that mesh with the helical teeth. The worm wheel's axis is perpendicular to the worm's axis. The worm wheel's position is fixed, and it is driven by the worm to rotate around its own axis. The ball screw section passes through the worm gear and is partially integrated with it. The worm gear rotates around its own axis, thereby indirectly driving the screw of the ball screw section to move along its length direction. as well as The shut-off valve has its valve core connected to the lead screw and driven by it to move axially. Specifically, the two relative directions of the axial displacement of the valve core are denoted as the first direction and the second direction, respectively. When the valve core displaces towards the first direction, the opening degree of the shut-off valve decreases; when the valve core displaces towards the second direction, the opening degree of the shut-off valve increases. The water flow in the inlet channel of the shut-off valve applies a force to the valve core in the second direction, thereby causing the lead screw to indirectly press the worm gear in the axial direction, which in turn causes the balls in the ball screw section to move slightly. This results in axial preload between the lead screw and the worm gear and eliminates the error caused by the axial clearance between them when the worm gear drives the lead screw to move in the opposite direction, ultimately achieving high-precision adjustment of the valve core.

2. The high-precision high-pressure regulating valve for automatically eliminating reverse rotation clearance according to claim 1, characterized in that: in, The shut-off valve includes: The valve body has an inlet pipe and an outlet pipe, wherein the inlet pipe and the outlet pipe each have an inlet channel and an outlet channel, and the inlet channel and the outlet channel intersect; and The valve core is connected to the lead screw and is driven by it to move along its length direction and is at least partially inserted in the water inlet channel, such that the valve cone of the valve core has different degrees of blockage at the junction of the water inlet channel and the water outlet channel, thereby changing the flow rate of the water outlet channel. The maximum radial outer diameter of the valve cone is at least 0.01 mm to 0.2 mm smaller than the inner diameter of the water inlet channel.

3. The high-precision high-pressure regulating valve that automatically eliminates reverse rotation clearance according to claim 2, Its features are: The valve body includes: A connecting unit is provided for the valve core having the valve cone end to pass through, and the end is sealed to the connecting unit; The water inlet unit includes the water inlet pipe, which is connected to the connection unit; and The water outlet unit includes the water outlet pipe, which is connected to the side wall of the connecting unit.

4. The high-precision high-pressure regulating valve that automatically eliminates reverse rotation clearance according to claim 2, Its features are: The valve body includes: A connecting unit is provided for the valve core having the valve cone end to pass through; The connecting unit includes a first connecting section, a radial water outlet section, and a second connecting section. The first connecting section is connected to the adapter unit. The radial water outlet section is connected to the first connecting section and its outer diameter is smaller than that of the first connecting section. The peripheral sidewall of the radial water outlet section has several openings. The second connecting section is connected to the radial water outlet section and its outer diameter is larger than that of the radial water outlet section. The water inlet unit includes the water inlet pipe and is connected to the second connecting section; The water outlet unit includes a rotating component and the water outlet pipe. The rotating component is rotatably ring-fixed on the radial water outlet section and is clamped together by the adapter unit and the second connecting section. The rotating component and the water outlet pipe are connected.

5. The high-precision high-pressure regulating valve for automatically eliminating reverse rotation gap according to claim 4, characterized in that: in, The valve core and the lead screw are connected by a threaded, detachable screw. The first connecting segment is detachably screwed to the adapter unit and sealed by a sealing ring. The rotating component and the adapter unit are sealed by a sealing ring, and the rotating component and the second connecting section are sealed by a sealing ring. The rotating component is detachably screwed to the water outlet pipe via a thread. The water inlet pipe is detachably screwed to the second connecting section.

6. The high-precision high-pressure regulating valve that automatically eliminates reverse rotation clearance according to claim 1, Its features are: The ball screw section includes: The first threaded groove is coiled and recessed in the through hole of the worm gear through which the ball screw part passes; The ball return channel has its inlet and outlet located in the through hole, and the inlet and outlet of the ball return channel are respectively connected to the two ends of the first threaded groove; The lead screw passes through the through hole; An anti-rotation ring, which is fixed in position and does not rotate on its own, passes through the end of the lead screw away from the shut-off valve and is used to prevent the lead screw from being driven by the worm gear to rotate around its own axis. The second threaded groove is recessed and coiled around the peripheral wall of the lead screw and matches the first threaded groove; and The number of balls is several; some are held by the first threaded groove and the second threaded groove together, while others are embedded in a row in the ball return channel. When the worm gear rotates around its own axis, it indirectly drives the lead screw to move along its length direction through the balls clamped between the first threaded groove and the second threaded groove.

7. The high-precision high-pressure regulating valve for automatically eliminating reverse rotation clearance according to claim 1, characterized in that, Also includes: Box; and A bearing housing is provided at the upper opening of the housing. The worm gear is provided in the internal space formed by the housing and the bearing housing. The upper and lower ends of the worm gear are indirectly connected to the lower surface of the bearing housing and the bottom of the housing through thrust bearings, so that it will not produce axial displacement when rotating around its own axis. The lead screw passes through the bottom of the housing and is connected to the valve core.

8. The high-precision high-pressure regulating valve for automatically eliminating reverse rotation clearance according to claim 1, characterized in that: in, The cylindrical outer surface of the worm gear has several worm gear teeth. The worm gear teeth extend parallel to the cylindrical central axis of the worm gear, and a tooth groove is formed between each pair of adjacent worm gear teeth to mesh with the helical teeth. The rotation of the worm causes the helical teeth to advance along the axial direction of the worm, thereby forming continuous line contact with the worm wheel teeth and forcing the worm wheel to rotate about its own central axis. Each of the worm gear teeth includes straight tooth sections at both ends and an arc-shaped tooth section in the middle that is recessed into the worm gear. The curvature of the bottom of the tooth groove is the same as the curvature of the helical tooth, and the inner chamfer of the sidewall of the tooth groove matches the outer chamfer of the helical tooth.

9. The high-precision high-pressure regulating valve for automatically eliminating reverse rotation clearance according to claim 1, characterized in that: in, The shut-off valve is made of duplex steel. The worm gear is made of stainless steel. The worm gear is made of brass.

10. A system for producing edible salt from seawater, characterized in that, The high-precision, high-pressure regulating valve with automatic elimination of reverse rotation clearance as described in any one of claims 1 to 9 is used and integrated into the container.

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