Intelligent anti-backpressure spring type safety valve

Abstract

The utility model discloses an intelligent anti-backpressure spring type safety valve, which relates to the technical field of safety valves and comprises a valve cover, a valve seat fixedly connected to the lower end of the valve cover, a valve clack arranged inside the valve seat, a corrugated pipe arranged between the upper end of the valve clack and the lower end of the valve cover, and mounting rings fixedly connected to the upper end of the valve clack and the lower end of the valve cover. The inner space of the valve cover and the inner space of the valve seat are divided through the arrangement of the corrugated pipe, when back pressure exists, the back pressure can be applied to the corrugated pipe, axial deformation generated by the corrugated pipe counteracts part of force, and therefore the valve cover and the valve seat can be prevented from being damaged, and the valve cover and the valve seat can be prevented from being damaged by the force counteracting part of the force counteracting part of the force counteracting part of the force counteracting part. And when the back pressure fluctuates by + / -20%, the pressure change of the space in the valve cover is smaller than or equal to 3%, and the deformation degree of the corrugated pipe is automatically adjusted according to the back pressure degree, so that the intelligent back pressure resisting effect is achieved, the influence of the back pressure on the spring is avoided, and the use stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to safety valve technical field especially relates to intelligent anti -back pressure spring formula safety valve. BACKGROUND

[0002] Spring formula safety valve refers to the spring's elastic pressure and will valve's valve or plunger etc. Sealing piece lock, once when the pressure of pressure container is abnormal, the high pressure that produces will overcome the spring pressure of safety valve, so the locking device is opened, forms a pressure relief channel, and high pressure is discharged. According to the valve flap opening height difference and divide into two kinds of full rise type and micro rise type. Full rise type discharges large, and the resilience is good, is applicable to liquid and gas medium, and micro rise type only is used to liquid medium.

[0003] Such as Chinese patent CN222559287U discloses a kind of anti-back pressure high-precision spring formula safety valve, including valve body, valve seat, valve flap, valve stem, guide sleeve and spring pressure setting device, guide sleeve lower end is by the radial outer step of valve seat and is pressed into valve body import, the upper part of valve seat is equipped with the convex cylinder concentrically installed in the guide cavity of guide sleeve.

[0004] In prior art, the valve stem and valve cover in spring formula safety valve are directly inserted, so that there is gap between spring cavity and back pressure cavity, back pressure will directly act on spring, resulting in change of spring load, affecting the use stability of spring formula safety valve. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of intelligent anti-back pressure spring formula safety valves to solve the problems existing in prior art, such as the valve stem and valve cover in spring formula safety valve are directly inserted, so that there is gap between spring cavity and back pressure cavity, back pressure will directly act on spring, resulting in change of spring load, affecting the use stability of spring formula safety valve.

[0006] To achieve the above object, the utility model uses the following technical scheme: intelligent anti-back pressure spring formula safety valve, including valve cover, the lower end of valve cover is fixedly connected with valve seat, the inside of valve seat is provided with valve flap, the upper end of valve flap and the lower end of valve cover are provided with bellow between, the upper end of valve flap and the lower end of valve cover are all fixedly connected with mounting ring, the inner ring surface of mounting ring is fixedly connected with reinforcing rib, the middle lower part of reinforcing rib outer ring surface is fixedly connected with convex ring, the end of bellow and mounting ring are fastened using throat clamp, bandage or snap ring, bellow and mounting ring are fixed and sealed between, this design can be convenient for the replacement of subsequent bellow, connection is more convenient, bellow is made of nickel-based alloy.

[0007] Preferably, the middle upper part of the outer surface of mounting ring is provided with sealing groove, and the sealing groove is used for connecting sealing ring.

[0008] Preferably, the upper end of the valve cover is fixedly connected with a protective cover, and the inside of the protective cover is provided with a valve rod.

[0009] Preferably, the lower end of the inside of the valve cover is provided with a second limiting seat, the lower end of the protective cover is provided with a first limiting seat, and the inside of the first limiting seat is threadedly connected with an adjusting screw rod.

[0010] Preferably, the upper end of the second limiting seat and the lower end of the inside of the valve cover are both provided with a first sliding groove, and the inside of the first sliding groove is slidably connected with a guide rod.

[0011] Preferably, the outer surface of the valve rod is fixedly connected with an inner plate, one side of the guide rod is provided with a second sliding groove, and the inner plate is slidably connected with the second sliding groove.

[0012] Preferably, a spring is arranged between the lower end of the first limiting seat and the upper end of the second limiting seat, and the inside of the valve seat is fixedly connected with an adjusting ring.

[0013] Compared with the prior art, the utility model has the advantages and positive effects that:

[0014] 1、In the utility model, the inside space of the valve cover and the inside space of the valve seat are divided by the setting of the corrugated pipe. When there is back pressure, the back pressure force is applied to the corrugated pipe, and the axial deformation of the corrugated pipe offsets part of the force, thereby offsetting the pressure fluctuation of the inside space of the valve cover. When the back pressure fluctuation is ± 20 %, the change of the inside space pressure of the valve cover is less than or equal to 3 %. The deformation degree of the corrugated pipe is adjusted according to the back pressure degree, so that the effect of intelligent anti-back pressure is realized. The influence of the back pressure on the spring is avoided, and the use stability is increased. The bearing degree of the mounting ring is increased by the setting of the reinforcing rib, so that the mounting ring is not pressed and damaged when the force is large. The tightness of the connection is ensured.

[0015] 2、In the utility model, the valve rod is limited by the setting of the guide rod and the inner plate, the vertical movement of the valve rod is ensured, the deflection of the valve rod is avoided, the use stability is increased, the guide rod is limited by the setting of the first sliding groove, and the guide rod is connected in the plug-in mode. When wear and damage occur in subsequent use, the replacement is convenient, and the utility is facilitated. SHEET DESCRIPTION

[0016] Figure 1 A three-dimensional structure schematic view of the intelligent anti-back pressure spring type safety valve is provided for the utility model;

[0017] Figure 2 An inside structure schematic view of the intelligent anti-back pressure spring type safety valve is provided for the utility model;

[0018] Figure 3 A three-dimensional structure schematic view of the valve clack in the intelligent anti-back pressure spring type safety valve is provided for the utility model;

[0019] Figure 4 This utility model presents a schematic diagram of the connection structure between the valve stem and the guide rod in an intelligent anti-back pressure spring safety valve.

[0020] Legend: 1. Valve cover; 2. Valve seat; 3. Protective cover; 4. Valve stem; 5. Spring; 6. Limit seat No. 1; 7. Limit seat No. 2; 8. Bellows; 9. Valve disc; 10. Adjusting ring; 11. Adjusting screw; 12. Mounting ring; 13. Reinforcing rib; 14. Sealing groove; 15. Raised ring; 16. Slide groove No. 1; 17. Guide rod; 18. Inner plate; 19. Slide groove No. 2. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1: As Figure 1 - Figure 4 As shown, this utility model provides an intelligent anti-back pressure spring safety valve, including a valve cover 1, a valve seat 2 fixedly connected to the lower end of the valve cover 1, a valve disc 9 provided inside the valve seat 2, a bellows 8 provided between the upper end of the valve disc 9 and the lower end of the valve cover 1, an installation ring 12 fixedly connected to both the upper end of the valve disc 9 and the lower end of the valve cover 1, a reinforcing rib 13 fixedly connected to the inner ring surface of the installation ring 12, a convex ring 15 fixedly connected to the lower part of the middle of the outer ring surface of the reinforcing rib 13, and the end of the bellows 8 is fastened to the installation ring 12 using a hose clamp, strap, or snap ring to fix and seal the bellows 8 to the installation ring 12. This design facilitates the replacement of the bellows 8 and makes the connection relatively convenient. The bellows 8 is made of nickel-based alloy.

[0024] The specific settings and effects of the embodiment are as follows. The valve cover 1 and the valve seat 2 are separated by the corrugated pipe 8. When there is back pressure, the back pressure is applied to the corrugated pipe 8, and the axial deformation of the corrugated pipe 8 offsets the force, thereby offsetting the pressure fluctuation in the valve cover 1. When the back pressure fluctuates by ±20%, the pressure in the valve cover 1 changes by ≤3%. The deformation degree of the corrugated pipe 8 is adjusted according to the degree of back pressure, thereby achieving the effect of intelligent back pressure resistance. The influence of back pressure on the spring 5 is avoided, and the stability of use is improved. The reinforcing ribs 13 are arranged to increase the bearing capacity of the mounting ring 12, thereby avoiding damage to the mounting ring 12 due to excessive force, and ensuring the tightness of the connection.

[0025] Embodiment two: as shown in Figure 1 Figure 4 The middle part of the outer surface of the mounting ring 12 is provided with a sealing groove 14. The sealing groove 14 is used to connect a sealing ring. The upper end of the valve cover 1 is fixedly connected with a protective cover 3. The protective cover 3 is internally provided with a valve rod 4. The lower end inside the valve cover 1 is provided with a second limiting seat 7. The lower end of the protective cover 3 is provided with a first limiting seat 6. The first limiting seat 6 is internally threadedly connected with an adjusting screw 11. The second limiting seat 7 and the upper end of the first limiting seat 6 and the lower end inside the valve cover 1 are all provided with a first sliding groove 16. The first sliding groove 16 is internally slidably connected with a guide rod 17. The outer surface of the valve rod 4 is fixedly connected with an inner plate 18. The guide rod 17 is provided with a second sliding groove 19 on one side. The inner plate 18 is slidably connected with the second sliding groove 19. The spring 5 is arranged between the lower end of the first limiting seat 6 and the upper end of the second limiting seat 7. The valve seat 2 is internally fixedly connected with an adjusting ring 10. The first sliding groove 16 in the first limiting seat 6 and the second limiting seat 7 is a through arrangement.

[0026] The effect of the whole embodiment is that the guide rod 17 and the inner plate 18 are arranged to limit the valve rod 4, ensure the vertical movement of the valve rod 4, and avoid the deflection of the valve rod 4, thereby increasing the stability of use. The first sliding groove 16 is arranged to limit the guide rod 17, and the guide rod 17 is connected in a plug-in manner. When wear and damage occur during subsequent use, the guide rod 17 is replaced more conveniently.

[0027] The use method and working principle of the device are as follows. In use, the opening and closing of the valve seat 2 are controlled by the up-down movement of the valve rod 4. At the same time, the inner plate 18 slides in the second sliding groove 19 during the up-down movement of the valve rod 4, thereby limiting the movement of the valve rod 4. At the same time, the back pressure generated in this process is applied to the corrugated pipe 8, so that the corrugated pipe 8 deforms and the back pressure is reduced, thereby reducing the influence on the spring 5.

[0028] ​The above merely is the preferred embodiment of the present application, and is not intended to limit the present application in other forms, and any skilled person in the art can change or modify the above disclosed technical content to equivalent embodiments with equivalent changes applied to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the technical scheme of the present application still falls within the protection scope of the present application.

Claims

1. A smart anti-back pressure spring loaded safety valve comprising a bonnet (1) characterized by: The lower end of the valve cover (1) is fixedly connected with a valve seat (2), the inside of the valve seat (2) is provided with a valve clack (9), the upper end of the valve clack (9) and the lower end of the valve cover (1) are provided with a corrugated pipe (8), the upper end of the valve clack (9) and the lower end of the valve cover (1) are fixedly connected with a mounting ring (12), the inner ring surface of the mounting ring (12) is fixedly connected with a reinforcing rib (13), the outer ring surface of the reinforcing rib (13) is fixedly connected with a convex ring (15) below the middle part.

2. The smart anti-back pressure spring and piston safety valve of claim 1, wherein: The middle part of the outer surface of the mounting ring (12) is provided with a sealing groove (14) above, and the sealing groove (14) is used for connecting a sealing ring.

3. The smart anti-back pressure spring and piston safety valve of claim 1, wherein: The upper end of the valve cover (1) is fixedly connected with a protective cover (3), and the inside of the protective cover (3) is provided with a valve stem (4).

4. The smart anti-back pressure spring and piston safety valve of claim 3, wherein: The lower end of the inside of the valve cover (1) is provided with a second limiting seat (7), the lower end of the protective cover (3) is provided with a first limiting seat (6), and the inside of the first limiting seat (6) is threadedly connected with an adjusting screw rod (11).

5. The smart anti-back pressure spring and piston safety valve of claim 4, wherein: The upper end of the first limiting seat (6) and the lower end of the inside of the valve cover (1) are both provided with a first sliding groove (16), and the inside of the first sliding groove (16) is slidably connected with a guide rod (17).

6. The smart anti-back pressure spring and piston safety valve of claim 5, wherein: The outer surface of the valve stem (4) is fixedly connected with an inner plate (18), one side of the guide rod (17) is provided with a second sliding groove (19), and the inner plate (18) is slidably connected with the second sliding groove (19).

7. The smart anti-back pressure spring and piston safety valve of claim 4, wherein: The lower end of the first limiting seat (6) and the upper end of the second limiting seat (7) are provided with a spring (5), and the inside of the valve seat (2) is fixedly connected with an adjusting ring (10).

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