Throttle valve capable of adjusting door closing speed in segmented mode

Abstract

The utility model relates to the technical field of door closer accessories, in particular to a throttle valve capable of adjusting door closing speed in a segmented mode, which comprises a rotary driving seat, a valve needle is installed in the rotary driving seat in a threaded mode, a valve needle adjusting device for adjusting vertical displacement of the valve needle is movably connected above the valve needle, and the valve needle comprises a valve needle seat and a valve needle body which are integrally arranged. The valve needle body comprises an upper cylindrical part and a lower conical part, the bottom of the rotary driving seat is in transmission connection with a piston through a gear structure, the piston is installed in a piston cylinder in a threaded mode, the piston moves upwards when a door is opened, and the valve needle body penetrates through a throttling hole of the one-way valve; the valve needle adjusting device can adjust the vertical position of the valve needle body so as to adjust gaps between the conical part and the throttling hole and between the cylindrical part and the throttling hole, the one-way valve moves downwards to the conical part of the valve needle during door closing, the gap between the conical part and the throttling hole can be larger and larger at the moment, the oil passing amount is gradually increased, and the problems that potential energy of a spring is insufficient and door closing is slow at the moment are solved. The overall door closing speed is more balanced, and the experience feeling is better.

Description

Technical Field

[0001] This utility model relates to the technical field of door closer accessories, and in particular to a throttle valve for segmented adjustment of door closing speed. Background Technology

[0002] Door closers are typically installed on the doors of large shopping malls, hotels, and other similar establishments to control the closing speed. Door closers generally consist of a combination of springs and hydraulic circuits. The closing force and speed are adjusted by regulating the torque or pressure of the spring, while fine-tuning is achieved by adjusting the flow rate and velocity of the hydraulic oil. The regulating valve, used to adjust the flow of hydraulic oil within the door closer, comprises a valve seat and a valve stem. The valve stem is typically cylindrical or conical, tapering at the top and widening at the bottom. By moving the relative position of the valve stem and valve seat, the flow rate and velocity of the hydraulic oil are controlled, thus allowing for fine-tuning of the door closer's closing speed.

[0003] When closing the door, the closing speed and force are regulated by the conversion of the spring's potential energy into kinetic energy and the amount of oil passing through the valve. The potential energy of the spring is converted into kinetic energy, which decreases as the opening angle of the door decreases. The potential energy of the spring gradually dissipates. When the opening angle decreases to a certain extent, it is called the critical state. At this point, the influence of the spring force on closing the door is less than the influence of the amount of oil passing through the valve. At this point, the amount of oil passing through the valve has a crucial effect on the closing speed. In existing technologies, to provide a buffer when closing the door, the valve stem often adopts a conical structure that is thinner at the top and thicker at the bottom. The gap between the valve stem and the valve seat gradually decreases as the closing angle decreases. This results in a decrease in the amount of oil flowing through the valve, causing the closing speed to gradually slow down from an initial high speed. In some cases, the reduced oil flow and weakened spring force can even lead to the door not closing completely, and the closing speed is uneven. Other existing technologies use a cylindrical valve stem with a consistently consistent gap between the valve stem and the valve seat. This results in a constant oil flow, but the closing speed gradually slows down from an initial high speed. Since the oil flow remains constant, the closing speed is adjusted solely by the spring force, leading to a highly uneven closing speed. Furthermore, the valve needle's vertical movement range is fixed in existing technologies, preventing the adjustment of closing force and speed based on the door's weight, thus affecting the safety and comfort of opening and closing the door. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a throttle valve that can adjust the closing speed in segments, which is well adapted to doors of different weights, has a more balanced closing speed, and avoids the situation of incomplete closing.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a throttle valve for segmented adjustment of closing speed, including a rotary drive seat, the rotary drive seat having a cavity along the axial direction, a valve needle being threadedly installed in the cavity, a valve needle adjusting device for adjusting the vertical displacement of the valve needle being movably connected above the valve needle, and a valve needle adjusting device for adjusting the vertical displacement of the valve needle, the valve needle including an integrally formed valve needle seat and valve needle body, the valve needle seat cooperating with the valve needle adjusting device, the valve needle body including a valve needle seat located on the upper part of the valve needle body. The rotary drive seat has a cylindrical part and a conical part located below it. The outer diameter of the cylindrical part is consistent with the outer diameter of the top end of the conical part. The outer diameter of the top end of the conical part is larger than the outer diameter of the bottom end. The bottom of the rotary drive seat is connected to a piston through a gear structure. The piston is threadedly installed in the piston cylinder. When the door is opened, the piston moves upward. A stepped through hole is provided at the axis of the piston. The stepped through hole includes an upper gear hole and a lower cylindrical hole arranged coaxially. A one-way valve is installed at the upper end of the lower cylindrical hole. The valve needle body passes through the throttling hole of the one-way valve.

[0006] As a preferred technical solution, the rotary drive base includes an integrally formed stepped cylinder, the outer diameter of the upper cylinder being larger than that of the lower cylinder, and a stepped cylindrical through hole is formed in the upper cylinder, in which the valve needle adjustment device is installed; the lower end outer surface of the lower cylinder is a gear shaft, the gear shaft meshing with the upper gear hole, and a threaded hole is formed in the lower cylinder for use with the valve needle body, the threaded hole having an internal thread.

[0007] As a preferred technical solution, a drive seat sealing groove is formed on the outer surface of the upper cylinder, and a drive seat sealing ring is installed in the drive seat sealing groove.

[0008] As a preferred technical solution, the upper cylinder is radially provided with a mounting hole that penetrates the stepped cylindrical through hole. The valve needle adjustment device includes a horizontal bevel gear and a vertical bevel gear that mesh vertically together. The horizontal bevel gear is fixedly installed in the middle of the horizontal adjusting rod. The two ends of the horizontal adjusting rod are rotatably installed in the mounting hole. The vertical bevel gear is fixedly installed at the top of the vertical adjusting rod. The lower end of the vertical adjusting rod is a plate-shaped tooth.

[0009] As a preferred technical solution, an adjusting rod sealing groove is provided on the vertical adjusting rod above the plate-shaped teeth, and an adjusting rod sealing ring is installed in the adjusting rod sealing groove.

[0010] As a preferred technical solution, the valve needle seat has an adjustment notch at the top, the plate-shaped teeth extend into the adjustment notch to control the rotation and lifting of the valve needle, and the outer periphery of the valve needle seat is provided with an external thread that cooperates with the internal thread.

[0011] As a preferred technical solution, the valve body of the one-way valve is a flat cylindrical shape, the throttling orifice is opened at the axis of the valve body, and a one-way guiding stepped hole is opened on the valve body next to the throttling orifice. The ball is located in a large-diameter hole below the one-way guiding stepped hole, and the diameter of the throttling orifice is larger than the maximum outer diameter of the valve needle body.

[0012] As a preferred technical solution, a piston sealing groove is formed around the upper end of the piston on its outer surface, and a piston sealing ring is installed in the piston sealing groove. An external piston thread is formed on the lower end of the piston on its outer surface, and an internal piston thread that mates with the piston cylinder is formed on the inner wall of the piston cylinder. When the rotary drive seat rotates together with the outer shell, the gear shaft controls the piston to rotate synchronously, and the piston moves up and down within the piston cylinder.

[0013] As a preferred technical solution, when the door closer is applied to the left-side door, the piston external thread is a forward-rotating thread, so the piston moves upward when opening the door and moves downward when closing the door; when the door closer is applied to the right-side door, the piston external thread is a reverse-rotating thread, so the piston moves upward when opening the door and moves downward when closing the door.

[0014] Due to the adoption of the above technical solution, the throttle valve for segmented adjustment of closing speed includes a rotary drive seat. The rotary drive seat has a cavity along its axial direction, and a valve needle is threadedly installed inside the cavity. A valve needle adjusting device for adjusting the vertical displacement of the valve needle is movably connected above the valve needle. The valve needle includes an integrally formed valve needle seat and valve needle body. The valve needle seat works in conjunction with the valve needle adjusting device. The valve needle body includes an upper cylindrical portion and a lower conical portion. The outer diameter of the cylindrical portion is consistent with the outer diameter of the top end of the conical portion, and the outer diameter of the top end of the conical portion is larger than the outer diameter of the bottom end. The rotary drive... A piston is connected to the bottom of the seat via a gear structure. The piston is threaded into the piston cylinder. When the door is opened, the piston moves upward. A stepped through hole is provided at the center of the piston. The stepped through hole includes an upper gear hole and a lower cylindrical hole arranged coaxially. A one-way valve is installed at the upper end of the lower cylindrical hole. The valve needle body passes through the throttling hole of the one-way valve. The beneficial effect of this utility model is that by adjusting the valve needle body's up and down position through the valve needle adjustment device, the gap between the conical part and the cylindrical part and the throttling hole can be adjusted. The closing speed can be adjusted by adjusting the amount of oil passing through, making it suitable for doors of different weights. When the rotary drive seat opens with the door, its bottom gear structure drives the piston to move upward within the piston cylinder, and the one-way valve also moves upward. When the door closes, the piston moves downward within the piston cylinder, and the one-way valve also moves downward. At this time, the closing speed mainly relies on the spring force. The gap between the cylindrical part of the valve needle and the throttle orifice is fixed, and the oil flow is constant, thus assisting the closing speed. When the closing angle reaches a critical state, the influence of the spring force on the closing speed is less than the influence of the oil flow of the throttle valve. At this point, the oil flow becomes crucial to the closing speed. By adjusting the valve needle adjustment device so that the boundary line between the conical and cylindrical parts of the valve needle is located at the upper edge of the throttle orifice, the closing speed begins to rely primarily on the gap between the conical part and the throttle orifice. The closing speed is determined by the amount of oil passing through the gap. Since the lower diameter of the conical part is smaller than the upper diameter, the one-way valve moves downward with the piston, and the gap between the conical part and the throttle orifice becomes larger and larger, resulting in a larger oil flow. This compensates for the slowdown in closing speed caused by insufficient spring force. When the door is close to 0 degrees, the one-way valve moves downward to the bottom of the conical part of the valve needle. Therefore, the decrease in the diameter of the conical part plays a key role in appropriately increasing the closing speed, resulting in a more balanced overall closing speed. The hydraulic driving force is still present until the door is closed, ensuring that the door is closed completely. Unlike the existing technology where the speed becomes extremely slow when the door is close, this utility model achieves segmented adjustment of the closing speed through the cylindrical and conical parts, resulting in a more balanced closing speed and a better closing experience. Attached Figure Description

[0015] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0016] Figure 1This is a schematic diagram of the throttle valve for segmented adjustment of closing speed according to this utility model;

[0017] Figure 2 yes Figure 1 A cross-sectional view of the door from its open to its closed state;

[0018] Figure 3 Yes, yes Figure 2 A magnified view of a section at point I;

[0019] Figure 4 Yes, yes Figure 2 Enlarged view of a section at point II;

[0020] Figure 5 This is one of the partial structural schematic diagrams of the throttle valve for segmented adjustment of closing speed according to this utility model;

[0021] Figure 6 yes Figure 5 Cross-sectional view of the valve needle at the upper end;

[0022] Figure 7 yes Figure 5 Cross-sectional view of the valve needle at the lower end;

[0023] Figure 8 This is the second partial structural schematic diagram of the throttle valve for segmented adjustment of closing speed according to this utility model;

[0024] Figure 9 This is an exploded view of the throttle valve for segmented adjustment of closing speed according to this utility model.

[0025] In the diagram: 1-Central support rod; 2-Piston cylinder; 3-Piston; 31-Upper gear hole; 32-Lower cylindrical hole; 33-Piston sealing groove; 34-Piston external thread; 4-Rotary drive seat; 41-Stepped cylindrical through hole; 42-Gear shaft; 43-Threaded hole; 44-Mounting hole; 45-Drive seat sealing groove; 5-Valve needle seat; 51-Adjusting notch; 52-External thread; 6-Valve needle body; 61-Cylindrical part; 62-Conical part; 7-Valve needle adjusting device; 71-Horizontal bevel gear; 72-Vertical bevel gear; 73-Horizontal adjusting rod; 74-Vertical adjusting rod; 75-Plate-shaped teeth; 76-Adjusting rod sealing ring; 8-One-way valve; 81-Throttle hole; 82-One-way stepped hole; 83-Ball bearing. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0027] like Figures 1 to 9As shown, the throttle valve for segmented adjustment of closing speed includes a rotary drive seat 4. The rotary drive seat 4 has a cavity along its axial direction, and a valve needle is threadedly installed inside the cavity. A valve needle adjusting device 7 is movably connected above the valve needle to adjust its vertical displacement. The valve needle includes an integrally formed valve needle seat 5 and valve needle body 6. The valve needle seat 5 works in conjunction with the valve needle adjusting device 7. The valve needle body 6 includes an upper cylindrical portion 61 and a lower conical portion 62. The outer diameter of the cylindrical portion 61 is consistent with the outer diameter of the top end of the conical portion 62, but the outer diameter of the top end of the conical portion 62 is larger than the outer diameter of the bottom end. The rotary drive seat 4... The bottom of the door is connected to a piston 3 via a gear structure. The piston 3 is threadedly installed inside the piston cylinder 2. When the door is opened, the piston 3 moves upward. A stepped through hole is provided at the axis of the piston 3. The stepped through hole includes an upper gear hole 31 and a lower cylindrical hole 32 arranged coaxially. A one-way valve 8 is installed at the upper end of the lower cylindrical hole 32. The valve needle body 6 passes through the throttle hole 81 of the one-way valve 8. The valve needle body 6 is adjusted up and down by the valve needle adjustment device 7, thereby adjusting the position between the conical part 62 and the cylindrical part 61 and the throttle hole 81. The closing speed is adjusted by adjusting the amount of oil, which is suitable for doors of different weights. The lengths of the cylindrical portion 61 and the conical portion 62 are adjusted according to the weight of the door. When the door is heavier, the cylindrical portion 61 is longer and the conical portion 62 is shorter. This is because the heavier the door, the greater its inertia, and the less power is needed to assist closing the door by increasing the amount of oil. Therefore, the conical portion 62 can be shorter. Conversely, when the door is lighter, the cylindrical portion 61 is shorter and the conical portion 62 is longer. When the rotary drive seat 4 opens with the door, its bottom gear structure drives the piston 3 to move upward within the piston cylinder 2. The piston cylinder 2 is integrated with the central support rod 1. When the door opens and closes, the central support rod 1 remains stationary, so the piston cylinder 2 also remains stationary, and the one-way valve 8 moves upward with the piston 3. When the door closes, the piston 3 moves downward within the piston cylinder 2, and the one-way valve 8 also moves downward. The valve needle adjustment device 7 adjusts the up and down position of the valve needle body 6, thereby adjusting the gap between the conical part 62 and the cylindrical part 61 and the throttle hole 81. The closing speed is adjusted by adjusting the amount of oil passing through, making it suitable for doors of different weights.When the rotary drive seat 4 opens with the door, its bottom gear structure drives the piston 3 to move upward within the piston cylinder 2, and the one-way valve 8 also moves upward. When the door closes, the piston 3 moves downward within the piston cylinder 2, and the one-way valve 8 also moves downward. At this time, the closing speed mainly relies on the spring force. The gap between the cylindrical part 61 of the valve needle and the throttle orifice 81 is fixed, and the oil flow is constant, thus assisting the closing speed. When the closing angle reaches a critical state, the influence of the spring force on the closing is less than the influence of the oil flow of the throttle valve on the closing. At this point, the oil flow becomes crucial to the closing speed. The valve needle adjustment device 7 adjusts the boundary line between the conical part 62 and the cylindrical part 61 of the valve needle body 6 to the upper edge of the throttle orifice 81. From this critical state onwards, the closing speed mainly relies on the gap between the cylindrical part 61 and the throttle orifice 81. The gap between the throttle orifices 81 is determined by the amount of oil passing through. Since the lower diameter of the conical part 62 is smaller than the upper diameter, the one-way valve 8 moves downward with the piston 3, and the gap between the conical part 62 and the throttle orifice 81 becomes larger and larger, resulting in a larger amount of oil passing through. This compensates for the slowdown in closing speed caused by insufficient spring force. When the door opening angle is close to 0 degrees, the one-way valve 8 moves downward to the bottom position of the conical part 62 of the valve needle. Therefore, as the diameter of the conical part 62 decreases, it plays a key role in appropriately increasing the closing speed, resulting in a more balanced overall closing speed. The hydraulic driving force still exists until the door is closed, ensuring that the door is closed in place. Unlike the existing technology where the speed becomes extremely slow when the door is close, this utility model achieves segmented adjustment of the closing speed through the cylindrical part and the conical part, resulting in a more balanced closing speed.

[0028] like Figure 1 , Figure 2 , Figure 6 and Figure 9 As shown, the rotary drive base 4 includes an integrally formed stepped cylinder, with the outer diameter of the upper cylinder being larger than that of the lower cylinder. A stepped cylindrical through-hole 41 is formed within the upper cylinder, and a valve needle adjustment device 7 is installed within the stepped cylindrical through-hole 41. The lower end of the lower cylinder has a gear shaft 42 on its outer surface, which meshes with the upper gear hole 31. A threaded hole 43, which mates with the valve needle body 6, is formed within the lower cylinder, and the threaded hole 43 has an internal thread. The upper cylinder is used for fixed connection with the outer casing, therefore its diameter is equal to the inner diameter of the outer casing. When the gear shaft 42 rotates, it drives the piston 3 to move up and down. The internal thread is used to adjust the vertical position of the valve needle.

[0029] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, a drive seat sealing groove 45 is formed on the outer surface of the upper cylinder, and a drive seat sealing ring is installed in the drive seat sealing groove 45. The drive sealing ring is used to seal the hydraulic oil and ensure the airtightness of the piston 3.

[0030] like Figure 2 and Figure 9 As shown, the upper cylinder has a radially extending mounting hole 44 that passes through the stepped cylindrical through hole 41. The valve needle adjusting device 7 includes a horizontal bevel gear 71 and a vertical bevel gear 72 that mesh vertically together. The horizontal bevel gear 71 is fixedly installed in the middle of the horizontal adjusting rod 73, and both ends of the horizontal adjusting rod 73 are rotatably installed in the mounting hole 44. The vertical bevel gear 72 is fixedly installed at the top of the vertical adjusting rod 74, and the lower end of the vertical adjusting rod 74 is a plate-shaped tooth 75. Figure 8 As shown, the valve needle seat 5 has an adjustment notch 51 on its top. The plate-shaped teeth 75 extend into the adjustment notch 51 to control the rotation and lifting of the valve needle. The valve needle seat 5 has an external thread 52 on its outer periphery that mates with the internal thread.

[0031] Rotating the horizontal adjusting rod 73 causes the horizontal bevel gear 71 to rotate, which in turn drives the vertical bevel gear 72 meshing with it to rotate, thereby driving the vertical adjusting rod 74 to rotate, converting the horizontal rotation into vertical rotation, which in turn drives the plate-shaped teeth 75 to rotate. Since the plate-shaped teeth 75 extend into the adjusting notch 51 of the valve needle seat 5, the valve needle seat 5 rotates when the plate-shaped teeth 75 rotates. Since the outer circumference of the valve needle seat 5 is provided with an external thread 52, the valve needle seat 5 will move up and down along the thread in the rotary drive seat 4, thereby adjusting the vertical position of the valve needle body 6. The vertical adjusting rod 74 does not produce vertical displacement; only the valve needle body 6 moves up and down along the thread, thereby adjusting the gap between the valve needle body 6 and the throttle orifice 81.

[0032] like Figure 2 , Figure 6 , Figure 7 and Figure 9 As shown, an adjusting rod sealing groove is provided on the vertical adjusting rod 74 above the plate-shaped teeth 75, and an adjusting rod sealing ring 76 is installed in the adjusting rod sealing groove. The adjusting rod sealing ring 76 is also for sealing hydraulic oil and preventing leakage.

[0033] like Figure 3 , Figure 4 , Figure 5 and Figure 8As shown, the valve body of the one-way valve 8 is a flat cylindrical shape. A throttling orifice 81 is located at the axis of the valve body. A one-way guided stepped orifice 82 is located next to the throttling orifice 81 on the valve body. A ball bearing 83 is located in a large-diameter hole below the one-way guided stepped orifice 82. The diameter of the throttling orifice 81 is larger than the maximum outer diameter of the valve needle body 6. Because the one-way valve 8 is installed at the upper end of the lower cylindrical hole 32, sufficient adjustment space is provided for the valve needle body 6. The ball bearing 83 of the one-way valve 8 is located at the bottom. Therefore, when the door is opened, the piston 3 moves upward, the one-way valve 8 is open, and the oil flow increases to store energy when the door is closed. When the door is closed, the piston 3 moves downward, the one-way valve 8 is closed, and the hydraulic oil only passes through the gap between the throttle orifice 81 and the valve needle body 6, slowing down the closing speed. As the piston 3 continues to move downward, since the bottom end of the valve needle body 6 is conical, the gap between the throttle orifice 81 and the valve needle body 6 becomes larger and larger. When the spring potential energy is exhausted, the slight increase in the oil flow increases the force and speed of closing the door appropriately, so that the speed is not too slow when the door is about to close, making the overall closing speed more balanced.

[0034] like Figure 2 As shown, a piston sealing groove 33 is formed around the upper end of the piston 3, and a piston sealing ring is installed inside the piston sealing groove 33. An external piston thread 34 is formed on the lower end of the piston 3, and an internal piston thread 34 is formed on the inner wall of the piston cylinder 2 to mate with it. When the rotary drive seat 4 rotates together with the outer casing, the gear shaft 42 controls the piston 3 to rotate synchronously, and the piston 3 moves up and down within the piston cylinder 2. The piston sealing ring is not shown in the figure; its purpose is to seal the hydraulic oil. The piston 3 moves up and down within the piston cylinder 2 through the threads.

[0035] like Figure 9 As shown, when the door closer is applied to the left door, the piston external thread 34 is a forward thread, so when the door is opened, the piston 3 moves upward and when the door is closed, the piston 3 moves downward; when the door closer is applied to the right door, the piston external thread 34 is a reverse thread, so when the door is opened, the piston 3 moves upward and when the door is closed, the piston 3 moves downward.

[0036] The workflow of this utility model is as follows:

[0037] Depending on the size and weight of the door, a suitable gap needs to be selected between the valve needle body 6 and the throttle orifice 81. Therefore, the vertical position of the valve needle needs to be adjusted to find the critical state. Rotating the horizontal adjusting rod 73 causes the horizontal bevel gear 71 to rotate, which in turn drives the vertical bevel gear 72 meshing with it to rotate, thereby driving the vertical adjusting rod 74 to rotate, converting the horizontal rotation into vertical rotation, which in turn drives the plate-shaped teeth 75 to rotate. Since the plate-shaped teeth 75 extend into the adjusting notch 51 of the valve needle seat 5, when the plate-shaped teeth 75 rotates, the valve needle seat 5 rotates accordingly. Since the outer circumference of the valve needle seat 5 is provided with an external thread 52, the valve needle seat 5 will move up and down along the thread in the rotary drive seat 4, thereby adjusting the vertical position of the valve needle body 6, and thus adjusting the gap between the valve needle body 6 and the throttle orifice 81. When the valve closes, piston 3 moves downward within piston cylinder 2, and check valve 8 also moves downward. At this time, the closing speed mainly relies on the spring force. The gap between the cylindrical part 61 of the valve needle and the throttle orifice 81 is fixed, and the oil flow is constant, which assists in the closing speed. When the closing angle reaches a critical state, the influence of the spring force on the closing is less than the influence of the oil flow of the throttle valve on the closing. At this time, the amount of oil flow has a crucial impact on the closing speed. The valve needle adjusting device 7 adjusts the boundary line between the conical part 62 and the cylindrical part 61 of the valve needle body 6 to be located at the upper edge of the throttle orifice 81. From this critical state onwards, the closing speed is mainly determined by the amount of oil flow through the gap between the conical part 62 and the throttle orifice 81. Since the lower diameter of the conical part 62 is smaller than the upper diameter, check valve 8 moves downward with piston 3, and the gap between the conical part 62 and the throttle orifice 81 becomes smaller. The larger the diameter of the cylinder, the greater the oil flow, which compensates for the slowdown in closing speed caused by insufficient spring force. When the opening angle is close to 0 degrees, the one-way valve 8 moves downward to the bottom position of the conical part 62 of the valve needle. Therefore, as the diameter of the conical part 62 decreases, it plays a key role in appropriately increasing the closing speed, resulting in a more balanced overall closing speed. The hydraulic driving force is still present until the door is closed, ensuring that the door is closed in place. Unlike the existing technology where the speed becomes extremely slow when the door is close, this utility model realizes segmented adjustment of the closing speed through the cylindrical part and the conical part, resulting in a more balanced closing speed and a better user experience.

[0038] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. 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 claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A throttle valve for segmented adjustment of closing speed, characterized in that: The device includes a rotary drive seat (4), which has a cavity along its axial direction. A valve needle is threaded into the cavity. A valve needle adjusting device (7) for adjusting the vertical displacement of the valve needle is movably connected above the valve needle. The valve needle includes an integrally formed valve needle seat (5) and valve needle body (6). The valve needle seat (5) works in conjunction with the valve needle adjusting device (7). The valve needle body (6) includes a cylindrical part (61) located above and a conical part (62) located below. The outer diameter of the cylindrical part (61) and the outer diameter of the top end of the conical part (62) are... To maintain consistency, the outer diameter of the top end of the conical part (62) is larger than the outer diameter of the bottom end. The bottom of the rotary drive seat (4) is connected to the piston (3) through a gear structure. The piston (3) is threadedly installed in the piston cylinder (2). When the door is opened, the piston (3) moves upward. A stepped through hole is provided at the axis of the piston (3). The stepped through hole includes an upper gear hole (31) and a lower cylindrical hole (32) arranged coaxially. A one-way valve (8) is installed at the upper end of the lower cylindrical hole (32). The valve needle body (6) passes through the throttling hole (81) of the one-way valve (8).

2. The throttle valve for segmented adjustment of closing speed as described in claim 1, characterized in that: The rotary drive seat (4) includes an integrally formed stepped cylinder, the outer diameter of the upper cylinder is larger than that of the lower cylinder, and a stepped cylindrical through hole (41) is opened in the upper cylinder. The valve needle adjustment device (7) is installed in the stepped cylindrical through hole (41). The lower end outer surface of the lower cylinder is a gear shaft (42), which meshes with the upper gear hole (31). A threaded hole (43) is opened in the lower cylinder to cooperate with the valve needle body (6). The threaded hole (43) is provided with internal threads.

3. The throttle valve for segmented adjustment of closing speed as described in claim 2, characterized in that: The outer surface of the upper cylinder is provided with a drive seat sealing groove (45), and a drive seat sealing ring is installed in the drive seat sealing groove (45).

4. The throttle valve for segmented adjustment of closing speed as described in claim 2, characterized in that: The upper cylinder is radially provided with a mounting hole (44) that passes through the stepped cylindrical through hole (41). The valve needle adjustment device (7) includes a horizontal bevel gear (71) and a vertical bevel gear (72) that mesh vertically together. The horizontal bevel gear (71) is fixedly installed in the middle of the horizontal adjustment rod (73). The two ends of the horizontal adjustment rod (73) are rotatably installed in the mounting hole (44). The vertical bevel gear (72) is fixedly installed at the top of the vertical adjustment rod (74). The lower end of the vertical adjustment rod (74) is a plate-shaped tooth (75).

5. The throttle valve for segmented adjustment of closing speed as described in claim 4, characterized in that: An adjustment rod sealing groove is provided on the vertical adjustment rod (74) above the plate-shaped teeth (75), and an adjustment rod sealing ring (76) is installed in the adjustment rod sealing groove.

6. The throttle valve for segmented adjustment of closing speed as described in claim 4, characterized in that: The valve needle seat (5) has an adjustment notch (51) at the top. The plate-shaped teeth (75) extend into the adjustment notch (51) to control the rotation and lifting of the valve needle. The valve needle seat (5) has an external thread (52) on its outer periphery that works with the internal thread.

7. The throttle valve for segmented adjustment of closing speed as described in claim 1, characterized in that: The valve body of the one-way valve (8) is a flat cylindrical shape. The throttling orifice (81) is opened at the axis of the valve body. A one-way guide stepped orifice (82) is opened on the valve body next to the throttling orifice (81). The ball (83) is located in the large-diameter hole below the one-way guide stepped orifice (82). The diameter of the throttling orifice (81) is larger than the maximum outer diameter of the valve needle body (6).

8. The throttle valve for segmented adjustment of closing speed as described in claim 2, characterized in that: The piston (3) has a piston sealing groove (33) around its outer surface at the upper end. A piston sealing ring is installed in the piston sealing groove (33). The piston (3) has an external piston thread (34) on its lower outer surface. The piston cylinder (2) has an internal piston thread that matches it on its inner wall. When the rotary drive seat (4) rotates with the outer shell, the gear shaft (42) controls the piston (3) to rotate synchronously. The piston (3) moves up and down in the piston cylinder (2).

9. The throttle valve for segmented adjustment of closing speed as described in claim 8, characterized in that: When the door closer is applied to the left door, the piston external thread (34) is a forward thread. When the door is opened, the piston (3) moves upward and when the door is closed, the piston (3) moves downward. When the door closer is applied to the right door, the piston external thread (34) is a reverse thread. When the door is opened, the piston (3) moves upward and when the door is closed, the piston (3) moves downward.

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