One-way valve for adjusting door closing speed of door closer

Abstract

The utility model relates to the technical field of door closer accessories, in particular to a one-way valve for adjusting the door closing speed of a door closer, which comprises a valve body mounted in an inner cavity of a piston, a throttling hole is arranged in the center of the valve body, a stepped hole is arranged on one side of the throttling hole on the valve body, and the stepped hole comprises an upper hole and a lower hole which are communicated with each other. A blocking piece is fixedly installed at the position, located on the lower surface of the lower hole, of the bottom of the valve body, a vertically-arranged spring is fixedly installed on the upper surface of the blocking piece, a ball is fixedly installed at the top end of the spring, the spring and the ball are both located in the lower hole, in a normal state, the spring is in an extension state, and the ball blocks the interface of the upper hole and the lower hole. Under the action of external force of hydraulic oil from top to bottom, the spring is in a compressed state, and the ball leaves the interface of the upper hole and the lower hole; when the door is closed, the spring restores quickly, the ball quickly blocks the interface of the upper hole and the lower hole again, hydraulic oil can only pass through the gap between the throttling hole and the valve needle, and the door closing speed is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of door closer accessories, and in particular to a one-way valve for adjusting the closing speed of a door closer. Background Technology

[0002] Door closers are typically installed on the entrances of large shopping malls, hotels, and other similar establishments to control the closing speed. Door closers generally consist of a combination of a torsion spring and a hydraulic circuit. The closing force and speed are adjusted by regulating the torque or pressure of the torsion spring, while fine-tuning is achieved by adjusting the flow rate and velocity of the hydraulic oil. The regulating valve, used to adjust the hydraulic oil flow in this door closer, comprises a valve seat and a valve stem. The valve stem is typically cylindrical or conical (thinner at the top, thicker 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 adjusted by the conversion of the potential energy and kinetic energy of the torsion spring and the amount of oil passing through it. The potential energy of the torsion spring is converted into kinetic energy from large to small. As the opening angle of the door decreases, the potential energy of the torsion spring gradually dissipates. When the opening angle decreases to a certain extent, this is called the critical state. At this time, the influence of the spring force on closing the door is less than the influence of the oil passing through the throttle valve on closing the door. At this time, the amount of oil passing through the one-way valve has a crucial effect on the closing speed.

[0004] In existing technologies, the ball bearings of the check valve in a door closer are located within the valve body. When the door is opened, the ball bearings move downwards, and the check valve is in the open state. When the door is closed, the ball bearings move upwards, and the check valve is in the closed state. Because the ball bearings are located within the valve body, when the door is closed, driven by hydraulic oil, the ball bearings slowly move upwards, causing the check valve to remain in the open state for a period of time at the beginning. During this period, the oil flow is relatively large, and the closing speed is relatively fast, which affects the safety and comfort of opening and closing the door. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a one-way valve for adjusting the closing speed of a door closer, which provides a more balanced closing speed and avoids excessively fast closing speed.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a one-way valve for adjusting the closing speed of a door closer, comprising a valve body installed in the inner cavity of a piston, a throttling orifice opened in the center of the valve body, and a stepped orifice opened on one side of the throttling orifice on the valve body, the stepped orifice comprising an upper orifice and a lower orifice connected to each other, the upper orifice penetrating the upper surface of the valve body, the lower orifice penetrating the lower surface of the valve body, the diameter of the upper orifice being smaller than the diameter of the lower orifice, a baffle plate fixedly installed at the bottom of the valve body at the lower surface of the lower orifice, a vertically arranged spring fixedly installed on the upper surface of the baffle plate, a ball fixedly installed at the top of the spring, the spring and the ball being located in the lower orifice, the spring being in an extended state under normal conditions, the ball blocking the interface between the upper orifice and the lower orifice, and when subjected to the external force of hydraulic oil from above, the spring being in a compressed state, the ball leaving the interface between the upper orifice and the lower orifice.

[0007] As a preferred technical solution, the valve body is cylindrical and adapted to the inner cavity of the piston. The throttling orifice is a cylindrical hole with the same inner diameter at the top and bottom. The throttling orifice is used for the valve needle to pass through, and the inner diameter of the throttling orifice is larger than the outer diameter of the valve needle.

[0008] As a preferred technical solution, the valve needle is conical, and the outer diameter of the upper end of the valve needle is larger than the outer diameter of the lower end.

[0009] As a preferred technical solution, both the upper hole and the lower hole are cylindrical holes, the outer diameter of the ball is smaller than the inner diameter of the lower hole, and the outer diameter of the ball is larger than the inner diameter of the upper hole.

[0010] As a preferred technical solution, the baffle is a circular ring, and the center of the baffle coincides with the axis of the throttling orifice.

[0011] As a preferred technical solution, the baffle is provided with an oil passage hole, and the baffle covers more than half of the bottom area of ​​the lower hole.

[0012] As a preferred technical solution, the center of the ball is located at the axis of the lower hole.

[0013] Due to the adoption of the above technical solution, the one-way valve used to regulate the closing speed of the door closer includes a valve body installed in the piston cavity. A throttling orifice is opened at the center of the valve body, and a stepped orifice is opened on one side of the throttling orifice on the valve body. The stepped orifice includes an upper orifice and a lower orifice that are connected. The upper orifice penetrates the upper surface of the valve body, and the lower orifice penetrates the lower surface of the valve body. The diameter of the upper orifice is smaller than that of the lower orifice. A baffle is fixedly installed at the bottom of the valve body at the lower surface of the lower orifice. A vertically arranged spring is fixedly installed on the upper surface of the baffle, and a ball is fixedly installed at the top of the spring. Both the spring and the ball are located in the lower orifice. Under normal conditions, the spring is in an extended state, and the ball blocks the interface between the upper and lower orifices. When subjected to the external force of hydraulic oil from above, the spring is in a compressed state, and the ball moves away from the upper orifice. The interface between the upper and lower holes; the beneficial effects of this utility model are: when opening the door, the piston moves upward in the piston cylinder, and the one-way valve also moves upward. The hydraulic oil flows from top to bottom through the gap between the valve needle and the throttle hole. On the other hand, the thrust of the hydraulic oil overcomes the elasticity of the spring, causing the spring to be in a compressed state. The ball leaves the interface between the upper and lower holes, and the hydraulic oil flows from the upper hole into the lower hole. When closing the door, the piston moves downward in the piston cylinder, and the one-way valve also moves downward. The hydraulic oil flows from bottom to top. The elasticity of the spring quickly recovers under the push of the hydraulic oil, and the ball quickly blocks the interface between the upper and lower holes again, so that the hydraulic oil can only pass through the gap between the throttle hole and the valve needle. This avoids the closing speed being too fast due to the ball returning too slowly and the large flow of oil. The presence of the spring allows it to release its elastic force in a timely manner, quickly blocking the interface between the upper and lower holes. This ensures that the closing speed is determined solely by the gap between the throttling orifice and the valve needle, reducing the closing speed and improving the safety and comfort of closing the door. The closing speed is more balanced, resulting in a better closing experience. Attached Figure Description

[0014] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0015] Figure 1 This is a structural schematic diagram of the one-way valve of this utility model during the opening process;

[0016] Figure 2 This is a structural schematic diagram of the one-way valve of this utility model during the closing process;

[0017] Figure 3 This is a diagram illustrating the effect of using this utility model.

[0018] In the diagram: 1-piston; 2-valve body; 3-throttle orifice; 4-upper hole; 5-lower hole; 6-baffle; 7-ball bearing; 8-spring; 9-valve needle; 10-oil passage hole. Detailed Implementation

[0019] 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.

[0020] like Figures 1 to 3 As shown, a one-way valve for adjusting the closing speed of a door closer includes a valve body 2 installed in the inner cavity of a piston 1. A throttling orifice 3 is located at the center of the valve body 2. A stepped orifice is located on one side of the throttling orifice 3 on the valve body 2. The stepped orifice includes an upper orifice 4 and a lower orifice 5 that are connected. The upper orifice 4 penetrates the upper surface of the valve body 2, and the lower orifice 5 penetrates the lower surface of the valve body 2. The diameter of the upper orifice 4 is smaller than the diameter of the lower orifice 5. A baffle 6 is fixedly installed at the bottom of the valve body 2 at the lower surface of the lower orifice 5. A vertically arranged spring 8 is fixedly installed on the upper surface of the baffle 6. A ball bearing 7 is fixedly installed at the top of the spring 8. Both the spring 8 and the ball bearing 7 are located inside the lower orifice 5. Under normal conditions, the spring 8 is in an extended state, and the ball bearing 7 blocks the interface between the upper orifice 4 and the lower orifice 5. When subjected to a downward hydraulic force, the spring 8 is in a compressed state, and the ball bearing 7... When the door opens, the piston 1 moves upward within the piston cylinder 1, and the check valve moves upward as well. Hydraulic oil flows from top to bottom through the gap between the valve needle 9 and the throttle orifice 3. Simultaneously, the thrust of the hydraulic oil overcomes the elasticity of the spring 8, causing the spring 8 to compress. The ball 7 then moves away from the interface between the upper hole 4 and the lower hole 5, and the hydraulic oil flows from the upper hole 4 into the lower hole 5. When the door closes, the piston 1 moves downward within the piston cylinder 1, and the check valve moves downward as well. Hydraulic oil flows upward, and the elasticity of the spring 8 quickly recovers under the thrust of the hydraulic oil, rapidly blocking the interface between the upper hole 4 and the lower hole 5 again. This ensures that the hydraulic oil can only pass through the gap between the throttle orifice 3 and the valve needle 9, preventing the ball 7 from returning too slowly and causing excessively fast closing speed due to high flow rate. The presence of spring 8 allows for timely release of elastic force to quickly block the interface between upper hole 4 and lower hole 5, ensuring that the closing speed is determined solely by the gap between throttle hole 3 and valve needle 9. This reduces the closing speed, improves the safety and comfort of closing, and results in a more balanced closing speed and a better closing experience.

[0021] like Figure 1 and Figure 2 As shown, the valve body 2 is cylindrical and fits the inner cavity of the piston 1. The throttle orifice 3 is a cylindrical hole with the same inner diameter at the top and bottom, through which the valve needle 9 passes. The inner diameter of the throttle orifice 3 is larger than the outer diameter of the valve needle 9. The valve body 2 moves up and down with the piston 1, and the lubricating oil flows up and down through the valve body 2. The hydraulic oil flows through the gap between the throttle orifice 3 and the valve needle 9 because the inner diameter of the throttle orifice 3 is the same at the top and bottom.

[0022] like Figure 1 and Figure 2 As shown, the valve needle 9 is conical, with the outer diameter of its upper end being larger than that of its lower end. The valve needle 9 is designed to be conical, thicker at the top and thinner at the bottom, to provide greater force for closing the door as it approaches closure. When the door closes, the one-way valve moves downwards along with the piston 1. At this time, the gap between the valve needle 9 and the throttle orifice 3 increases, resulting in a larger oil flow. This compensates for the problem of excessively slow closing speed in existing technologies, ensuring the door closes completely. Unlike existing technologies where the closing speed becomes extremely slow when the door is nearing closure, this invention uses the conical valve needle 9 to adjust the closing speed, resulting in a more balanced closing speed and a better user experience.

[0023] like Figure 1 and Figure 2 As shown, both the upper hole 4 and the lower hole 5 are cylindrical holes. The outer diameter of the ball 7 is smaller than the inner diameter of the lower hole 5, and the outer diameter of the ball 7 is larger than the inner diameter of the upper hole 4. The ball 7 can move up and down within the lower hole 5. Under normal conditions, the ball 7 blocks the interface between the upper hole 4 and the lower hole 5, preventing the hydraulic oil from flowing. When the door is opened, the ball 7 leaves the interface between the upper hole 4 and the lower hole 5, leaving sufficient gap between it and the inner circumferential surface of the lower hole 5 for the hydraulic oil to pass through.

[0024] like Figure 1 and Figure 2 As shown, the baffle 6 is a circular ring, and its center coincides with the axis of the throttling orifice 3. The central hole of the circular ring is larger than the diameter of the lower hole 5, so it does not obstruct the displacement of the valve needle 9. The coincidence of the center of the baffle 6 with the axis of the throttling orifice 3 facilitates installation and provides greater stability.

[0025] like Figure 1 and Figure 2 As shown, the baffle 6 has an oil passage hole 10, which covers more than half of the bottom area of ​​the lower hole 5. The oil passage hole 10 allows hydraulic oil to pass through without adding extra resistance to the oil circuit. The baffle 6 covering more than half of the bottom area of ​​the lower hole 5 effectively prevents the ball 7 from falling off, increases the mounting area of ​​the spring 8, and improves stability.

[0026] like Figure 1 and Figure 2 As shown, the center of ball 7 is located at the axis of the lower hole 5. Because the center of ball 7 is located at the axis of the lower hole 5, when ball 7 is at its top, it perfectly covers the interface between the upper hole 4 and the lower hole 5, preventing displacement and oil leakage.

[0027] The workflow of this utility model is as follows:

[0028] When the door is opened, piston 1 moves upward within piston cylinder 1, and the one-way valve also moves upward. Hydraulic oil flows from top to bottom through the gap between valve needle 9 and throttle orifice 3. On the other hand, the thrust of the hydraulic oil overcomes the elasticity of spring 8, causing spring 8 to be in a compressed state. Ball 7 leaves the interface between upper hole 4 and lower hole 5, and hydraulic oil flows from upper hole 4 into lower hole 5. When the door is closed, piston 1 moves downward within piston cylinder 1, and the one-way valve also moves downward. Hydraulic oil flows from bottom to top. The elasticity of spring 8 quickly recovers under the push of the hydraulic oil, quickly blocking the interface between upper hole 4 and lower hole 5 again with ball 7. This ensures that hydraulic oil can only pass through the gap between throttle orifice 3 and valve needle 9, preventing the door from closing too quickly due to slow return of ball 7 and large flow of oil. The presence of spring 8 allows for timely release of elastic force to quickly block the interface between upper hole 4 and lower hole 5, ensuring that the closing speed is determined solely by the gap between throttle hole 3 and valve needle 9. This reduces the closing speed, improves the safety and comfort of closing, and results in a more balanced closing speed and a better closing experience.

[0029] 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.

[0030] 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 check valve for regulating the door closing speed of a door closer, characterised in that: The valve body (2) is installed in the inner cavity of the piston (1), the center of the valve body (2) is provided with a throttle hole (3), the valve body (2) is provided with a stepped hole on one side of the throttle hole (3), the stepped hole comprises an upper hole (4) and a lower hole (5) in communication, the upper hole (4) penetrates the upper surface of the valve body (2), the lower hole (5) penetrates the lower surface of the valve body (2), the hole diameter of the upper hole (4) is smaller than that of the lower hole (5), the bottom of the valve body (2) is fixedly installed with a baffle (6) at the lower surface of the lower hole (5), the upper surface of the baffle (6) is fixedly installed with a vertically arranged spring (8), the top end of the spring (8) is fixedly installed with a ball (7), the spring (8) and the ball (7) are located in the lower hole (5), the spring (8) is in an elongated state under normal circumstances, the ball (7) blocks the interface between the upper hole (4) and the lower hole (5), when subjected to external hydraulic oil force from top to bottom, the spring (8) is in a compressed state, and the ball (7) is away from the interface between the upper hole (4) and the lower hole (5).

2. The check valve for adjusting the door closer closing speed of a door closer according to claim 1, wherein: The valve body (2) is cylindrical and matched with the inner cavity of the piston (1), the throttle hole (3) is a cylindrical hole with consistent inner diameter from top to bottom, the throttle hole (3) is used for passing through a valve needle (9), and the inner diameter of the throttle hole (3) is greater than the outer diameter of the valve needle (9).

3. The check valve for adjusting the door closer closing speed of a door closer according to claim 2, wherein: The valve needle (9) is conical, the outer diameter of the upper end of the valve needle (9) is greater than that of the lower end.

4. The check valve for adjusting the door closer closing speed of a door closer according to claim 1, wherein: The upper hole (4) and the lower hole (5) are both cylindrical holes, the outer diameter of the ball (7) is smaller than the inner diameter of the lower hole (5), and the outer diameter of the ball (7) is greater than the inner diameter of the upper hole (4).

5. The check valve for adjusting the door closer closing speed of a door closer of claim 1, wherein: The baffle (6) is a circular ring, and the center of the baffle (6) coincides with the axis of the throttle hole (3).

6. The check valve for adjusting the door closer closing speed of a door closer according to claim 5, wherein: The baffle (6) is provided with an oil passing hole (10), and the baffle (6) blocks more than half of the bottom area of the lower hole (5).

7. The check valve for adjusting the door closer closing speed of a door closer of claim 1, wherein: The ball center of the ball (7) is located at the axis of the lower hole (5).

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