A hydraulic door closer

Abstract

The present invention discloses a hydraulic door closer, comprising: a throttle valve rod, a piston cylinder block and a piston disposed within the cylinder block; the throttle valve rod is installed on the upper section of the piston cylinder block, with a part thereof placed within the cylinder block, and a dial is provided on the throttle valve rod; a throttle valve gland and a throttle valve seat are successively provided at the top end of the cylinder block, the throttle valve gland is fixed to the cylinder block, and the throttle valve seat is fixed to the throttle valve rod; a hemispherical groove is provided at the lower end of the throttle valve gland, and a hemispherical convex surface adapted to the hemispherical groove is provided at the top end of the throttle valve seat; a one-way valve body is press-fitted on the upper surface of the piston, and a throttle hole is provided on the upper surface of the one-way valve body. The present invention can increase or decrease continuously, effectively improving the linear adjustment of the hydraulic oil. When the viscosity of the hydraulic oil changes due to different regions and seasonal variations, the smoothness of the use of the door closer can be improved.

Description

Technical Field

[0001] The present invention provides a door and window automatic closing device, in particular a hydraulic control door closer. Background Art

[0002] Door closers are usually installed on the doors in large office areas (as well as commercial merchants, shopping malls, supermarkets, etc.) to control the speed of closing the door. A door closer generally has a structure combining a spring and a hydraulic oil circuit. By adjusting the torque or pressure of the spring, the closing force and speed of the door closer are adjusted, and fine adjustment is achieved by adjusting the flow rate and flow of the hydraulic oil circuit. The viscosity of the hydraulic oil is greatly affected by temperature. Especially when the environment temperature is below -10 degrees Celsius, the viscosity increases significantly and the flow rate becomes significantly slower. In order to adapt to the change of ambient temperature, a flow regulating valve is often provided on the hydraulic return circuit of the door closer. The flow regulating valve includes a valve seat and a valve stem structure. The valve stem generally adopts a conical structure. By moving the relative position of the valve stem and the valve seat, the flow rate and flow of the hydraulic oil are controlled, so as to achieve fine adjustment of the closing speed of the door closer.

[0003] The thickness of the throttle valve stem on the throttle valve device of the existing hydraulic door closer is fixed, with a conical or cylindrical shape and an inclined conical surface machined on it. The throttle valve stem is fixed, and the size of the throttle hole is also fixed. Then the gap between the throttle valve stem and the throttle hole is fixed. When the ambient temperature changes due to different regions and seasons and the viscosity of the hydraulic oil changes, the position between the inclined conical surface and the throttle hole is adjusted by moving the throttle rod up and down to control the flow rate of the hydraulic oil, so as to achieve fine adjustment of the closing speed of the door closer.

[0004] However, this adjustment method cannot be effectively adjusted in extremely harsh weather conditions. Taking Shell No. 26 hydraulic oil as an example, the viscosity at 20°C is 61.87, at 10°C it is 166.06, at 0°C it is 199.09, and at -10°C it is 417.82. It can be seen that the viscosity of the hydraulic oil changes less above 0°C with the change of temperature, and the viscosity almost rises linearly below 0°C. Therefore, when the temperature difference changes greatly, the traditional throttle rod cannot effectively control the opening and closing speed of the door closer due to limited adjustment amount in some regions or extreme weather conditions (mainly low temperature). The function table of the temperature and viscosity change of 26# Shell hydraulic oil is shown in the appendix Figure 3 . Summary of the Invention

[0005] The purpose of the present invention is to provide a hydraulic door closer to solve the drawback of the small adjustment range of the existing door closer oil circuit, reduce the influence of the external temperature change on the door closer, improve the linear adjustment ability of the door closer, and meet the applicability of the door closer in extreme temperature environments.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A hydraulic door closer, comprising: a throttle valve rod, a piston cylinder body, and a piston disposed in the cylinder; the throttle valve rod is installed in the upper section of the piston cylinder body, with a part placed inside the cylinder, and a dial is provided on the throttle valve rod; a throttle valve gland and a throttle valve seat are successively provided at the top of the cylinder body. The throttle valve gland is fixed on the cylinder body, and the throttle valve seat is fixed on the throttle valve rod; the throttle valve rod, the throttle valve gland, the throttle valve seat, and the throttle orifice of the one-way valve body on the piston are of a concentric structure; a hemispherical groove is provided at the lower end of the throttle valve gland, and a hemispherical convex surface adapted to the hemispherical groove is provided at the top of the throttle valve seat; a one-way valve body is pressed onto the piston, and a throttle orifice is provided on the one-way valve body; a throttle valve sleeve is provided at the lower section of the throttle valve rod, and an elastically deformable object is provided between the throttle valve sleeve and the throttle valve rod; the elastically deformable object is an elastic sealing ring, including a first sealing ring and a second sealing ring, for flexible sealing.

[0007] The throttle valve gland and the cylinder body are installed at the upper end of the cylinder body in a concentric manner and are threadedly connected, and the throttle valve seat is fixed on the throttle valve rod through a threaded structure.

[0008] According to the technical solution of the present invention, when the piston moves up and down, it can ensure the accurate relative position of the throttle valve rod and the throttle orifice of the one-way valve at the upper end of the piston, always maintaining a concentric state, and improving the smoothness of adjustment.

[0009] The elastically deformable object is a steel umbrella-shaped structure.

[0010] The present invention can be continuously increased or decreased, effectively improving the linear adjustment of the hydraulic oil. When the viscosity of the hydraulic oil changes due to different regions and seasonal variations, the smoothness of the use of the door closer is improved.

[0011] For the throttle valve device with the above structure, when the viscosity of the hydraulic oil changes due to large temperature changes in winter and summer seasons, through the adjustment of the throttle valve rod, the gap between the throttle valve rod and the throttle orifice of the one-way valve body can linearly become larger or smaller. The hemispherical groove provided on the throttle valve gland is adapted to the hemispherical convex surface of the lower throttle valve seat. In this way, the throttle rod will have better centering, so that the throttle rod and the throttle orifice maintain a high concentricity, and the closing speed of the door closer can be stabilized within a certain range, greatly improving the smoothness of the use of the door closer and enhancing the applicable range of regional temperature differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 are schematic structural diagrams when the present invention is in use;

[0013] Figure 2 are partial structures of the present invention;

[0014] Figure 3 1. The viscosity change of Shell 26# hydraulic oil with temperature;

[0015] In the figure: 1. Pulleys; 2. Throttle valve gland; 3. Throttle valve seat; 4. Throttle valve sleeve; 5. Check valve body; 6. Throttle valve seat sealing ring; 7. Throttle valve rod; 8. Throttle orifice; 9. Piston cylinder; 10. Piston. Specific embodiments

[0016] The following describes the specific structure and usage method of the present invention with reference to the embodiments shown in the accompanying drawings.

[0017] As shown in the accompanying drawings, a new throttle valve device on a door closer of the present invention includes a pulley installed at the upper end of the throttle valve rod 7. There is a throttle valve gland 2 with a hemispherical groove below the pulley. The throttle valve gland is installed on the piston cylinder 9. There is a throttle valve seat 3 below the throttle valve gland. The throttle valve seat has a hemispherical convex surface adapted to the hemispherical groove. There is a throttle valve sleeve 4 below the throttle valve seat, which is sleeved outside the throttle valve rod. There is a throttle valve seat elastic sealing ring or an elastically deformable part 6 between the throttle valve sleeve and the inner end of the throttle valve rod. A check valve body 5 is pressed onto the piston. There is a throttle orifice 8 in the middle of the check valve body.

[0018] During use, the piston is installed in the piston cylinder, and the throttle valve device is installed at the upper end of the piston cylinder. When the pulley is rotated counterclockwise, the throttle valve rod moves upward. Part of the upper end of the throttle valve rod has a threaded structure, which is matched with the threaded hole in the middle of the throttle valve seat. At this time, the throttle valve sleeve 4 will squeeze the throttle valve seat elastic sealing ring, and the throttle valve seat sealing ring will expand and become larger due to extrusion. At this time, the gap between the throttle valve rod and the throttle orifice will become smaller. The piston is machined with a cam groove. When the piston moves upward, the flow rate of the hydraulic oil through the gap becomes smaller. At this time, the moving speed of the piston will also become slower. When closing the door, the piston is pushed upward by the spring force. At this time, the hydraulic oil in the upper cavity of the piston cylinder will be squeezed and flow through the gap between the throttle valve rod and the throttle orifice to the lower end of the cavity; the closing speed of the door closer will also become slower. The piston is machined with a spiral groove, and the spiral groove is fixed in the positioning hole of the cylinder block through a stud. A sliding bushing is sleeved on the stud. When opening the door, the central shaft in the middle rotates, driving the piston to rotate. The central shaft and the piston are connected by a spline that can slide to transmit torque. Since the piston is positioned in the positioning hole of the cylinder block through a stud, the piston will slide down along the spline of the central shaft, so the compression spring. When the door is closed, the kinetic energy stored in the spring is released and becomes potential energy, so the door will close automatically.

[0019] Conversely, when the pulley is rotated clockwise, the throttle valve seat sealing ring will become smaller again, and the gap between the throttle valve rod and the throttle orifice will become larger. When closing the door, the piston moves upward, and the flow rate of the hydraulic oil through the gap becomes faster. At this time, the moving speed of the piston will also become faster, and the closing speed of the door closer will also become faster.

[0020] In this way, when the viscosity of the hydraulic oil in the door closer changes due to large temperature variations in winter and summer, the clearance between the throttle valve stem and the one-way valve body can be linearly increased or decreased through the adjustment of this throttle valve device. Thus, the flow rate of the hydraulic oil flowing from the upper cavity of the piston cylinder to the lower cavity can be controlled, and the closing speed of the door closer can be ensured to be stable within a certain range, greatly improving the smoothness of use of the door closer.

[0021] Since there is a hemispherical concave surface under the throttle valve gland and a hemispherical convex surface on the throttle valve seat, when the throttle valve gland is tightened, the concave surface of the throttle valve gland will squeeze the convex surface of the throttle valve seat, which has a function of free centering and centering to ensure the centering of the throttle valve stem.

[0022] The throttle valve seat 3 with a hemispherical convex surface adapted to the hemispherical groove means that the shapes, sizes, etc. of the hemispherical groove and the hemispherical convex surface are mutually adapted and can be butt-jointed and installed together to achieve the use performance.

[0023] It also has a first sealing ring 11 and a second sealing ring 12 for flexible sealing.

[0024] Since the throttle valve gland 2 with a hemispherical groove is adapted to the hemispherical convex head of the lower throttle valve seat 3, the concentricity of the oil needle to the throttle hole can be freely and finely adjusted.

[0025] In a traditional center-hung door closer, the oil circuit control part mainly relies on the fixed clearance between a cylindrical throttle rod (commonly known as a needle valve) and the throttle hole of the one-way valve for oil circuit control. Since the viscosity change of the pressure oil is very obvious at low temperatures and the throttle rod is made of a rigid material, its adjustment amount is limited.

[0026] In the throttle valve rod described in this patent, the elastic material sleeved on the throttle rod is adjusted and extruded through a thread to make its expanded diameter larger, so that the original rigid throttle rod changes in diameter to control the clearance between the throttle rod and the throttle hole on the one-way valve, thereby realizing oil circuit control.

Claims

1. A hydraulic door closer, comprising: Throttle valve stem, piston cylinder block and piston arranged in the cylinder block; characterized in that the throttle valve stem is installed on the upper section of the piston cylinder block, with a part placed inside the cylinder block, and a dial is provided on the throttle valve stem; a throttle valve gland and a throttle valve seat are successively arranged at the top of the cylinder block, the throttle valve gland is fixed on the cylinder block, and the throttle valve seat is fixed on the throttle valve stem; the throttle valve stem, the throttle valve gland, the throttle valve seat and the throttle orifice of the one-way valve body on the piston are concentric structures; a hemispherical groove is provided at the lower end of the throttle valve gland, and a hemispherical convex surface adapted to the hemispherical groove is provided at the top of the throttle valve seat; a one-way valve body is pressed onto the piston, and a throttle orifice is provided on the one-way valve body; a throttle valve sleeve is provided on the lower section of the throttle valve stem, and an elastically deformable object is arranged between the throttle valve sleeve and the throttle valve stem; the elastically deformable object is an elastic sealing ring, including a first sealing ring and a second sealing ring, for flexible sealing.

2. The hydraulic door closer according to claim 1, characterized in that, The throttle valve gland and the cylinder block are installed at the upper end of the cylinder block in a concentric manner by threaded connection, and the throttle valve seat is fixed on the throttle valve stem through a threaded structure.

3. The hydraulic door closer according to claim 2, characterized in that, The elastically deformable object is a steel umbrella-shaped structure.

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