An automatic regulating spring type safety valve

Abstract

The present invention relates to an automatic regulating spring type safety valve, comprising: a valve body, a valve seat, a valve disc, a recoil disc, a guide sleeve, a valve cover, a valve stem and a spring pressure setting device, wherein an adjusting ring is arranged on the valve seat; the characteristic is that: the adjusting ring is provided with an automatic regulating device, when the medium pressure of the inlet channel rises to the set pressure and the valve disc opens, the automatic regulating device drives the regulating ring to move upward, so that the valve disc and the recoil disc are subjected to a greater recoil force and rise rapidly, and when the medium pressure at the inlet channel drops, the automatic regulating device drives the regulating ring to move downward, so that the valve disc and the recoil disc reduce the recoil force and drop rapidly, and the valve has the characteristics of high opening height, small opening and closing pressure difference, etc.

Description

Technical Field

[0001] The invention relates to a safety valve, in particular to a spring type safety valve. Background Art

[0002] In order to make the valve disc fully open when the valve disc is opened, the traditional spring-loaded safety valve has a recoil disc outside the valve disc, and an adjustment ring is arranged on the outer circle of the upper part of the valve seat. The adjustment ring is connected to the valve seat by a thread. When the valve is in a closed state, the vertical distance between the recoil disc and the adjustment ring is adjusted by manually rotating the adjustment ring. When discharging, the flow direction of the medium is changed, and the recoil disc is further pushed upward, so that it is easier to open the valve disc and reach the fully open state. Its disadvantage is that although the valve disc is more likely to reach the fully open state under the cooperation of the recoil disc and the adjustment ring, when the recoil disc is moved upward by the recoil force of the medium, when the medium pressure on the inlet side drops and the valve disc returns to the seat, since the position of its adjustment ring is fixed, the existence of the adjustment ring hinders the descent of the recoil disc, and the recoil disc is more difficult to move downward. When the medium pressure on the inlet side is lower, the recoil disc and the valve disc can return to the seat and the valve can be closed, resulting in low valve return pressure, large opening and closing pressure difference, and large energy waste. Summary of the invention

[0003] In view of the technical defects in the prior art, the present invention provides an automatically adjustable spring-type safety valve, in which an adjusting ring automatically moves upward when the valve disc is opened, so that the valve disc quickly reaches a fully open state; when the valve disc is closed, the adjusting ring automatically moves downward, the valve disc returns to its seat quickly, and the opening and closing pressure difference is small.

[0004] The present invention is achieved through the following technical solutions:

[0005] An automatic regulating spring type safety valve comprises: a valve body, a valve seat, a valve disc, a recoil disc, a guide sleeve, a valve cover, a valve stem and a spring pressure setting device. The valve body has an inlet channel and a discharge channel. The valve seat is installed in the inlet channel of the valve body. An adjusting ring is arranged outside the sealing surface of the valve seat. The upper end of the guide sleeve is fixedly installed between the valve body and the valve cover. The guide hole at the lower end is movably matched with the guide column on the upper part of the recoil disc. The valve disc is installed on the lower end surface of the recoil disc. The spring pressure setting device is installed between the valve cover and the valve stem. The spring pressure setting device comprises a pre-compression spring, an upper spring seat, a lower spring seat and an adjusting screw sleeve. The section screw sleeve is threadedly installed on the upper part of the valve cover, the lower end of the adjusting screw sleeve presses the upper spring seat, the lower end of the valve stem presses the recoil disk, and the upper end of the valve stem passes through the lower spring seat, the preload spring and the upper spring seat in sequence, and extends into the inner cavity of the protective cover at the upper end of the valve cover; it is characterized in that: the adjusting ring is provided with an automatic adjusting device, the automatic adjusting device is composed of a control ring and a spring, the control ring is provided with a pressure inlet cavity, which is installed on the outer cylindrical surface of the valve seat, the pressure inlet cavity is connected with the valve seat inlet cavity through the pressure inlet hole, the elastic force of the spring is equal to the discharge pressure, and the medium pressure of the valve seat inlet cavity pushes the control ring through the spring to drive the adjusting ring to move up and down.

[0006] Furthermore, the adjusting ring is installed on the upper outer cylindrical surface of the valve seat through a thread, a groove is provided at the lower part of the adjusting ring, a clamping head extending into the groove is provided at the upper end of the control ring, the spring is installed between the lower end surface of the control ring and the radial outer step of the valve seat, a spiral groove is provided on the outer wall of the valve seat, and a protrusion that movably cooperates with the spiral groove is provided on the inner wall of the control ring.

[0007] Furthermore, the inner hole of the adjusting ring is dynamically sealed with the outer circular surface of the valve seat, and a radial annular boss is provided at the lower end of the adjusting ring. The outer circular surface of the radial annular boss is dynamically sealed with the inner circular surface of the control ring, and the lower annular surface is connected to the pressure-inducing chamber. A limiting step is provided between the lower annular surface of the radial annular boss and the control ring, and a spring is installed between the upper annular surface of the radial annular boss and the radial inner boss at the upper end of the control ring.

[0008] Furthermore, the valve seat includes an upper valve seat and a lower valve seat, the lower valve seat is fixedly connected to the lower part of the inner cavity wall of the valve body, the upper valve seat is sealed and fixed to the upper part of the lower valve seat, and an anti-rotation pin is provided between the lower valve seat and the upper valve seat.

[0009] Furthermore, a lifting nut is arranged at the upper end of the valve stem, and a lifting frame and a handle are arranged below the lifting nut. The lifting frame, the lifting nut and the valve stem can be driven to move upward by rotating the handle.

[0010] The advantages of the present invention are that the adjustment ring adopts a self-powered automatic adjustment device. When the medium pressure in the inlet channel rises to the set pressure and the valve disc opens, the automatic adjustment device drives the adjustment ring to move upward, so that the valve disc and the recoil disk are subjected to a greater recoil force and rise rapidly. When the medium pressure in the inlet channel drops, the automatic adjustment device drives the adjustment ring to move downward, so that the valve disc and the recoil disk reduce the recoil force and drop rapidly. The invention has the characteristics of high opening height and small opening and closing pressure difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention.

[0012] Figure 2 It is a structural schematic diagram of another embodiment of the present invention. DETAILED DESCRIPTION

[0013] like Figure 1 , Figure 2The automatic regulating spring safety valve shown in the figure comprises: a valve body 1, a valve seat, a valve disc 12, a recoil disc 13, a guide sleeve 14, a valve cover 15, a valve stem 17 and a spring pressure setting device. The valve body 1 has an inlet channel 28 and a discharge channel 25. The valve seat is installed in the inlet channel 28 of the valve body 1. An adjusting ring 11 is arranged outside the sealing surface of the valve seat. The upper end of the guide sleeve 14 is fixedly installed between the valve body 1 and the valve cover 15. The guide hole at the lower end is dynamically matched with the guide column on the upper part of the recoil disc 13. The valve disc 12 is installed on the lower end surface of the recoil disc 13. The spring pressure setting device comprises a pre-compression spring 16, an upper spring seat 23, a lower spring seat 24 and an adjusting screw sleeve 22, which are integrally installed between the valve cover 15 and the valve stem 17. The adjusting screw sleeve 22 is installed on the upper part of the valve cover 15. , its lower end presses the upper spring seat 23, the lower end of the valve stem 17 presses the recoil disk 13, and the upper end passes through the lower spring seat 24, the preload spring 16, the upper spring seat 23 and the adjusting screw sleeve 22 in sequence, and extends into the inner cavity of the protective cover 20 at the upper end of the valve cover 15; it is characterized in that: the adjusting ring 11 is provided with an automatic adjusting device, the automatic adjusting device is composed of a control ring 4 and a spring 3, the control ring 4 is installed on the outer cylindrical surface of the valve seat, and a pressure-inducing cavity 5 is provided between the control ring 4 and the outer cylindrical surface of the valve seat, the pressure-inducing cavity 5 is connected with the valve seat inlet cavity through the pressure-inducing hole 6, and the medium pressure of the valve seat inlet cavity is introduced into the pressure-inducing cavity, the elastic force of the spring 3 is equal to the set pressure of the spring pressure setting device, and the medium pressure of the valve seat inlet cavity drives the control ring 4 through the spring 3 to drive the adjusting ring 11 to move up and down. The pressure of spring 3 can be designed to be slightly less than the set pressure. When the pressure of the valve seat inlet cavity rises to close to the discharge pressure, the pressure in the pressure-inducing cavity 5 compresses the spring 3, pushes the control ring 4 to drive the adjusting ring 11 to move upward, so that the recoil disk 13 and the valve disc 12 are quickly opened to the fully open position to discharge the medium; when the medium is discharged to a pressure lower than the set pressure, the spring 3 returns to its original position, and the control ring 4 drives the adjusting ring 11 to move downward, so that the recoil disk 13 and the valve disc 12 are quickly closed, and the opening and closing pressure difference is small.

[0014] like Figure 1 As shown, the adjusting ring 11 is installed on the outer cylindrical surface of the upper part of the valve seat through threads, a groove 10 is provided at the lower part of the adjusting ring 11, a clamping head 9 extending into the groove 10 is provided at the upper end of the control ring 4, and the spring 3 is installed between the lower end surface of the control ring 4 and the radial outer step of the valve seat, a spiral groove 7 is provided on the outer wall of the valve seat, and a convex block 26 that flexibly cooperates with the spiral groove 7 is provided on the inner wall of the control ring 4. When the medium pressure in the pressure chamber 5 exceeds the elastic force of the spring 3, the medium pressure pushes the control ring 4 to spirally rise in the spiral groove 7 of the valve seat, and the clamping head 9 pushes the adjusting ring 11 to spirally rise in the groove 10; conversely, when the medium pressure in the pressure chamber 5 is lower than the elastic force of the spring 3, the clamping head 9 pushes the adjusting ring 11 to spirally descend in the groove 10.

[0015] like Figure 2As shown, the inner hole of the adjustment ring 11 is in dynamic sealing cooperation with the outer cylindrical surface of the valve seat, and a radial annular boss 30 is provided at the lower end of the adjustment ring 11. The outer cylindrical surface of the radial annular boss 30 is in dynamic sealing cooperation with the inner cylindrical surface of the control ring 4, and the lower annular surface is connected with the pressure chamber 5. A limit step is provided between the lower annular surface of the radial annular boss 30 and the control ring 4 to limit the downward movement distance of the adjustment ring 11. The spring 3 is installed between the upper annular surface of the radial annular boss 30 and the radial inner boss at the upper end of the control ring 4. The radial inner boss is formed by a spring gland 29 threadedly installed on the outer cylindrical surface of the control ring 4, which is convenient for installing the spring 3. When the medium pressure in the pressure chamber 5 exceeds the elastic force of the spring 3, the medium pressure overcomes the elastic force of the spring 3 and pushes the adjustment ring 11 upward; when the medium pressure in the pressure chamber 5 is lower than the elastic force of the spring 3, the spring 3 pushes the adjustment ring 11 downward.

[0016] The valve seat includes an upper valve seat 8 and a lower valve seat 2, which is convenient for the installation process of the automatic adjustment device. The control ring 4 is installed on the outer circular surface of the upper valve seat 8, the lower valve seat 2 is fixedly connected to the lower part of the inner cavity wall of the valve body 1, and the upper valve seat 8 is sealed and fixed on the upper part of the lower valve seat 2. An anti-rotation pin 27 is provided between the lower valve seat 2 and the upper valve seat 8 to prevent the two from rotating relative to each other.

[0017] A lifting nut 21 is provided at the upper end of the valve stem 17, and a lifting frame 19 and a handle 18 are provided below the lifting nut 21. By rotating the handle 18, the lifting frame 19, the lifting nut 21 and the valve stem 17 can be driven to move upward, thereby realizing manual emergency opening to discharge the medium.

Claims

1. An automatic regulating spring-type safety valve, comprising: A valve body (1), a valve seat, a valve disc (12), a recoil disc (13), a guide sleeve (14), a valve cover (15), a valve stem (17) and a spring pressure setting device. The valve body (1) has an inlet passage (28) and a discharge passage (25). The valve seat is installed in the inlet passage (28) of the valve body (1). An adjusting ring (11) is arranged outside the sealing surface of the valve seat. The upper end of the guide sleeve (14) is fixedly installed between the valve body (1) and the valve cover (15). The guide hole at the lower end is dynamically matched with the guide column at the upper part of the recoil disc (13). The valve disc (12) is installed on the lower end surface of the recoil disc (13). The spring pressure setting device comprises a preload spring (16), an upper spring seat (23), a lower spring seat (24) and an adjusting screw sleeve (22). The spring pressure setting device is installed as a whole between the valve cover (15) and the valve stem (17). The adjusting screw sleeve (22) is threadably installed on the valve cover. (15), the lower end of which presses the upper spring seat (23), the lower end of the valve stem (17) presses the recoil disc (13), and the upper end passes through the lower spring seat (24), the preload spring (16), the upper spring seat (23) and the adjusting screw sleeve (22) in sequence, and extends into the inner cavity of the protective cover (20) at the upper end of the valve cover (15); characterized in that: the adjusting ring (11) is provided with an automatic adjusting device, the automatic adjusting device is composed of a control ring (4) and a spring (3), the control ring (4) is installed on the outer cylindrical surface of the valve seat, and a pressure induction chamber (5) is provided between the control ring (4) and the outer cylindrical surface of the valve seat, the pressure induction chamber (5) is connected to the valve seat inlet chamber through the pressure induction hole (6), the elastic force of the spring (3) is equal to the set pressure of the spring pressure setting device, and the medium pressure of the valve seat inlet chamber pushes the control ring (4) through the spring (3) to drive the adjusting ring (11) to move up and down.

2. The automatic regulating spring type safety valve according to claim 1 is characterized in that: The adjusting ring (11) is installed on the outer cylindrical surface of the upper part of the valve seat through a thread, a groove (10) is provided at the lower part of the adjusting ring (11), a clamping head (9) extending into the groove (10) is provided at the upper end of the control ring (4), the spring (3) is installed between the lower end surface of the control ring (4) and the radial outer step of the valve seat, a spiral groove (7) is provided on the outer wall of the valve seat, and a protrusion (26) movably matched with the spiral groove (7) is provided on the inner wall of the control ring (4).

3. The automatic regulating spring type safety valve according to claim 1 is characterized in that: The inner hole of the adjusting ring (11) is dynamically sealed with the outer cylindrical surface of the valve seat. The lower end of the adjusting ring (11) is provided with a radial annular boss (30). The outer cylindrical surface of the radial annular boss (30) is dynamically sealed with the inner cylindrical surface of the control ring (4). The lower annular surface is communicated with the pressure-inducing chamber (5). A limiting step is provided between the lower annular surface of the radial annular boss (30) and the control ring (4). The spring (3) is installed between the upper annular surface of the radial annular boss (30) and the radial inner boss at the upper end of the control ring (4).

4. The automatic regulating spring type safety valve according to claim 1, 2 or 3, characterized in that: The valve seat comprises an upper valve seat (8) and a lower valve seat (2), the control ring (4) is mounted on the outer circumferential surface of the upper valve seat (8), the lower valve seat (2) is fixedly connected to the lower part of the inner cavity wall of the valve body (1), the upper valve seat (8) is sealed and fixed to the upper part of the lower valve seat (2), and an anti-rotation pin (27) is provided between the lower valve seat (2) and the upper valve seat (8).

5. The automatic regulating spring type safety valve according to claim 1, 2 or 3, characterized in that: A lifting nut (21) is provided at the upper end of the valve stem (17), and a lifting frame (19) and a handle (18) are provided below the lifting nut (21). The lifting frame (19), the lifting nut (21) and the valve stem (17) can be driven to move upward by rotating the handle (18).

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