Protection device of pressure relief emptying valve

Abstract

The utility model relates to the technical field of valve accessories, and discloses a protection device of a pressure relief emptying valve, which comprises an emptying valve part and a pressure relief screw, the emptying valve part is provided with an exhaust port for exhausting, the pressure relief screw is hermetically connected with the exhaust port, the emptying valve part is also fixedly provided with a pressure relief shell, a pressure relief cavity is formed in the pressure relief shell, and the pressure relief cavity is communicated with the pressure relief screw. The pressure relief screw can axially move in the pressure relief cavity, a second combination face is arranged at the end, away from the emptying valve part, of the pressure relief shell, and a first combination face is fixedly installed at the end, away from the exhaust port, of the pressure relief screw. According to the utility model, when the pressure relief screw is operated to rotate, the pressure relief screw is blocked by the pressure relief shell and cannot wholly penetrate through the second combination surface, so that the risk that the pressure relief screw flies out along with high-pressure air flow is avoided. And meanwhile, the volume of the emptying valve of the emptying valve part is increased through the installation of the pressure relief shell, visual observation is more visual, yellow or red spray paint with a warning mark can be sprayed, and confusion with a balance valve lacking a hand wheel is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valve accessories, in particular to a protection device for a pressure relief and vent valve. Background Art

[0002] Orifice flowmeters are widely used in flow measurement, particularly in the industrial sector, to measure the flow of gases, liquids, and steam. Their operating principle is based on the pressure differential generated by gas or liquid flowing through an orifice plate, using the Bernoulli equation to calculate the fluid's flow rate. To ensure the safety and stability of orifice flowmeters under various operating conditions, a vent valve is typically installed to relieve system pressure. When system pressure exceeds the set range, the vent valve opens, allowing air to quickly escape through the pressure relief port to prevent accidents caused by excessive system pressure.

[0003] However, during actual operation, as air rushes out of the vent valve's pressure relief port, a series of safety hazards can arise. One significant issue is that the high-speed impact of the pressure relief airflow can cause the pressure relief screw on the vent valve to be dislodged, potentially impacting and damaging surrounding equipment and even leading to accidents. Especially under high-pressure conditions, the impact of the pressure relief airflow is even more intense. If the screw is dislodged, it could pose a significant threat to the safety of surrounding equipment and personnel.

[0004] To this end, we propose a protection device for a pressure relief and vent valve. Utility Model Content

[0005] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a protection device for a pressure relief and vent valve.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a protective device for a pressure relief and vent valve, comprising a vent valve part and a pressure relief screw, the vent valve part is provided with an exhaust port for exhaust, the pressure relief screw is sealed and connected to the exhaust port, a pressure relief shell is also fixedly installed on the vent valve part, a pressure relief cavity is formed inside the pressure relief shell, the pressure relief screw can move axially in the pressure relief cavity, a second joint surface is provided at one end of the pressure relief shell away from the vent valve part, a first joint surface is fixedly installed at one end of the pressure relief screw away from the exhaust port, the first joint surface passes through the second joint surface and extends to the outside of the second joint surface, the diameter of the first joint surface is smaller than the diameter of the pressure relief screw, and a pressure relief port for exhaust is provided on the side of the pressure relief shell.

[0007] Preferably, one end of the second joint surface close to the pressure relief cavity is chamfered to form a chamfered sealing groove, and one end of the pressure relief screw connected to the first joint surface is chamfered to form a chamfered sealing portion, and the chamfered sealing groove and the chamfered sealing portion have the same chamfer angle.

[0008] Preferably, the side wall of the pressure relief shell is provided with at least two groups of pressure relief ports at different angles, and the outer wall of the pressure relief shell is provided with an adjustment groove at a position corresponding to the pressure relief port, and the adjustment groove is an annular groove which surrounds the pressure relief shell, and a retaining ring main body and a retaining ring split are provided in the adjustment groove, and the retaining ring main body is a semicircular plate, and retaining ring splits are fixedly installed at both circumferential ends of the retaining ring main body, and the distance between the two groups of retaining ring splits is greater than the distance of the pressure relief port diameters.

[0009] Preferably, a valve body mounting plate is integrally formed at the port of the exhaust port, and an outer shell cover plate is movably mounted on the valve body mounting plate. The outer shell cover plate is composed of two groups of semicircular blocks. The two groups of outer shell cover plates are merged around the exhaust port behind the valve body mounting plate to form a circular plate. A positioning rod is integrally formed on the outer shell cover plate, and the positioning rod corresponds one-to-one to the fastening groove of the valve body mounting plate. The pressure relief shell and the outer shell cover plate are fastened together by fasteners.

[0010] Preferably, one end of the pressure relief screw extending into the exhaust port forms a third joint surface, a pressure relief hole is opened in the third joint surface, the pressure relief hole is composed of an axial groove and a radial groove staggered, the third joint surface is provided with an external thread connected to the exhaust port thread, and a sealing gasket is provided between the first joint surface and the second joint surface.

[0011] Preferably, the outer wall of the first joint surface is provided with an external thread, the second joint surface is provided with an internal thread, the first joint surface and the second joint surface are threadedly connected, and the outer wall of the third joint surface is a smooth wall surface.

[0012] Preferably, a groove is provided at one end of the first joint surface outside the second joint surface to form an operating portion.

[0013] Beneficial effects

[0014] The utility model provides a protective device for a pressure relief valve. It has the following beneficial effects:

[0015] (1) The protective device of the pressure relief vent valve is such that when the pressure relief screw is rotated, the pressure relief screw is blocked by the pressure relief housing and cannot pass through the second joint surface, thereby avoiding the risk of the pressure relief screw flying out with the high-pressure airflow. At the same time, the installation of the pressure relief housing increases the volume of the vent valve, making it more intuitive to see. It can be sprayed with yellow or red warning paint, effectively avoiding confusion with a balancing valve that lacks a handwheel.

[0016] (2) A protective device for a pressure relief vent valve is provided by providing a plurality of pressure relief ports on a pressure relief shell, and arranging a circumferentially rotatable retaining ring body at the same position as the pressure relief ports on the pressure relief shell. The retaining ring body can be rotated to expose the pressure relief ports at corresponding positions between the two retaining ring bodies, thereby preventing the equipment in front of the pressure relief ports from being damaged by high-pressure airflow due to the fixed pressure relief ports. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a disassembled diagram of the three-dimensional structure of the utility model;

[0021] Figure 3 This is a cross-sectional view of the utility model;

[0022] Figure 4 This is another schematic diagram of the shell structure of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the existing vent valve of the utility model.

[0024] Legend:

[0025] 1. Vent valve part; 2. Exhaust port; 3. Pressure relief screw; 4. Pressure relief shell; 5. Pressure relief chamber; 6. Pressure relief port; 7. Chamfered sealing groove; 8. Chamfered sealing part; 9. Operating part; 10. First joint surface; 11. Second joint surface; 12. Third joint surface; 13. Pressure relief hole; 14. Valve body mounting plate; 15. Shell cover; 16. Positioning rod; 17. Fastener; 18. Adjustment groove; 19. Retaining ring body; 20. Retaining ring split. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] like Figure 5 As shown, the existing high-grade orifice flowmeter is designed with a vent valve, and a pressure relief screw 3 is threadedly connected to the vent valve. The pressure relief screw 3 seals the vent valve. When exhaust is required, the pressure relief screw 3 is loosened, and the air flow rushes out from the exhaust port 2. Because the air pressure in the high-grade orifice flowmeter is very high, when the pressure relief screw 3 is loosened, the high-pressure gas may bring out the pressure relief screw 3, impacting facilities and equipment and personnel, causing personal and property losses.

[0028] Therefore, a protective device for a pressure relief valve is proposed, such as Figure 1-Figure 4 As shown, it includes a vent valve portion 1 and a pressure relief screw 3. The vent valve portion 1 is provided with an exhaust port 2 for exhausting gas. The pressure relief screw 3 is sealed with the exhaust port 2. The exhaust port 2 and the pressure relief screw 3 are coaxial, and the pressure relief screw 3 can move axially in the exhaust port 2. In particular, a pressure relief shell 4 is fixedly installed on the vent valve portion 1. The pressure relief shell 4 is a hollow shell coaxial with the pressure relief screw 3, and a pressure relief cavity 5 is formed inside the pressure relief cavity 5. The pressure relief screw 3 can move axially in the pressure relief cavity 5. The pressure relief shell 4 is provided at one end away from the vent valve portion 1. The second joint surface 11, the end of the pressure relief screw 3 away from the exhaust port 2 is fixedly mounted with a first joint surface 10, the first joint surface 10 passes through the second joint surface 11 and extends to the outside of the second joint surface 11, the diameter of the first joint surface 10 is smaller than the diameter of the pressure relief screw 3, and the side of the pressure relief housing 4 is provided with a pressure relief port 6 for exhaust. Therefore, when the pressure relief screw 3 is rotated, the pressure relief screw 3 is blocked by the pressure relief housing 4 and cannot pass through the second joint surface 11 in its entirety, thus avoiding the risk of the pressure relief screw 3 flying out with the high-pressure airflow. At the same time, the installation of the pressure relief housing 4 increases the volume of the vent valve portion 1, making it more intuitive visually, and can be sprayed with yellow or red warning paint, effectively avoiding confusion with a balancing valve that lacks a handwheel.

[0029] Furthermore, one end of the second joint surface 11 close to the pressure relief chamber 5 is chamfered to form a chamfered sealing groove 7, and the end of the pressure relief screw 3 connected to the first joint surface 10 is chamfered to form a chamfered sealing portion 8. The chamfered sealing groove 7 and the chamfered sealing portion 8 have the same chamfer angle and can cooperate with each other. After the pressure relief screw 3 is loosened, with the impact of the high-pressure airflow, the chamfered sealing portion 8 is tightly attached to the chamfered sealing groove 7, so that the high-pressure gas will not leak from the second joint surface 11, thereby preventing the operator from being injured.

[0030] Furthermore, a groove is provided at one end of the first joint surface 10 outside the second joint surface 11 to form an operating portion 9, so as to facilitate the wrench clamping operation.

[0031] Furthermore, one end of the pressure relief screw 3 extending into the exhaust port 2 forms a third joint surface 12. In some embodiments, the third joint surface 12 is provided with an external thread and is threadedly connected to the exhaust port 2. At this time, the outer wall surfaces of the first joint surface 10 and the second joint surface 11 are smooth wall surfaces. A sealing gasket can also be provided between the first joint surface 10 and the second joint surface 11 to improve the sealing performance at the first joint surface 10.

[0032] In other embodiments, the outer wall of the first joint surface 10 is provided with an external thread, the second joint surface 11 is provided with an internal thread, the first joint surface 10 and the second joint surface 11 are threadedly connected, and the outer wall of the third joint surface 12 is a smooth wall surface. In this embodiment, since the third joint surface 12 is in a sliding connection with the exhaust port 2, the occurrence of a situation where the screw cannot be loosened after rusting is reduced.

[0033] A pressure relief hole 13 is provided in the third joint surface 12 , which is composed of axial grooves and radial grooves interlaced, so that the airflow in the exhaust port 2 can flow axially from the tail of the third joint surface 12 and then be ejected radially from both sides of the third joint surface 12 .

[0034] Specifically, there are various ways to connect the pressure relief shell 4 and the vent valve part 1, which can be connected by welding or fastening. In this embodiment, a valve body mounting plate 14 is integrally formed at the port of the exhaust port 2, and a shell cover plate 15 is movably mounted on the valve body mounting plate 14. The shell cover plate 15 is composed of two groups of semicircular blocks. The two groups of shell cover plates 15 are merged around the exhaust port 2 behind the valve body mounting plate 14 to form a circular plate. A positioning rod 16 is integrally formed on the shell cover plate 15. The positioning rod 16 corresponds one-to-one to the fastening groove of the valve body mounting plate 14. The pressure relief shell 4 and the shell cover plate 15 are fastened together by fasteners 17. The fasteners 17 can be conventional fastening structures such as screws or rivets.

[0035] Because the direction of the pressure relief port 6 is fixed after the pressure relief shell 4 is installed, the equipment located in front of the pressure relief port 6 is easily damaged by high-pressure gas during long-term use. To solve this problem, in some embodiments, the side wall of the pressure relief shell 4 is provided with at least two groups of pressure relief ports 6 with different angles, and the outer wall of the pressure relief shell 4 is provided with an adjustment groove 18 at the position corresponding to the pressure relief port 6. The adjustment groove 18 is an annular groove around the pressure relief shell 4, and a retaining ring body 19 and a retaining ring split 20 are provided in the adjustment groove 18. The retaining ring body 19 is a semicircular plate, and retaining ring splits 20 are fixedly installed at both circumferential ends of the retaining ring body 19. The distance between the two groups of retaining ring splits 20 is greater than the distance of the diameter of the pressure relief port 6. Therefore, the retaining ring body 19 can be rotated to expose the pressure relief port 6 at the corresponding position between the two groups of retaining ring splits 20, thereby avoiding the equipment in front of the pressure relief port 6 being damaged by high-pressure airflow due to the fixed pressure relief port 6.

[0036] Furthermore, the pressure relief housing 4 and the pressure relief screw 3 are both made of a corrosion-resistant and high-strength alloy material.

[0037] The working principle of the present invention is as follows: when the pressure relief screw 3 is rotated, it is blocked by the pressure relief housing 4 and cannot pass through the second joint surface 11, thereby avoiding the risk of the pressure relief screw 3 being ejected with the high-pressure airflow. At the same time, the installation of the pressure relief housing 4 increases the size of the vent valve portion 1, making it more intuitive to see. It can be sprayed with yellow or red warning paint, effectively avoiding confusion with balancing valves that lack a handwheel.

[0038] By opening multiple groups of pressure relief ports 6 on the pressure relief housing 4 and setting a circumferentially rotatable retaining ring body 19 at the same position on the pressure relief housing 4 as the pressure relief ports 6, the retaining ring body 19 can be rotated to expose the pressure relief ports 6 at the corresponding positions between the two groups of retaining ring parts 20, thereby avoiding damage to the equipment in front of the pressure relief ports 6 due to high-pressure airflow due to the fixed pressure relief ports 6.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A protective device for a pressure relief vent valve, comprising a vent valve portion (1) and a pressure relief screw (3), wherein the vent valve portion (1) is provided with an exhaust port (2) for exhaust, and the pressure relief screw (3) is sealedly connected to the exhaust port (2), characterized in that: A pressure relief shell (4) is also fixedly mounted on the vent valve portion (1), a pressure relief cavity (5) is formed inside the pressure relief shell (4), and the pressure relief screw (3) can move axially in the pressure relief cavity (5). A second joint surface (11) is provided at one end of the pressure relief shell (4) away from the vent valve portion (1), and a first joint surface (10) is fixedly mounted at one end of the pressure relief screw (3) away from the exhaust port (2). The first joint surface (10) passes through the second joint surface (11) and extends to the outside of the second joint surface (11). The diameter of the first joint surface (10) is smaller than the diameter of the pressure relief screw (3). A pressure relief port (6) for exhaust is provided on the side of the pressure relief shell (4).

2. A protective device for a pressure relief valve according to claim 1, characterized in that: The end of the second joint surface (11) close to the pressure relief cavity (5) is chamfered to form a chamfered sealing groove (7), and the end of the pressure relief screw (3) connected to the first joint surface (10) is chamfered to form a chamfered sealing portion (8), and the chamfered sealing groove (7) and the chamfered sealing portion (8) have the same chamfer angle.

3. The protective device for a pressure relief valve according to claim 1, characterized in that: The side wall of the pressure relief shell (4) is provided with at least two groups of pressure relief ports (6) with different angles. An adjustment groove (18) is provided on the outer wall of the pressure relief shell (4) at a position corresponding to the pressure relief ports (6). The adjustment groove (18) is an annular groove surrounding the pressure relief shell (4). A retaining ring body (19) and a retaining ring split (20) are provided in the adjustment groove (18). The retaining ring body (19) is a semicircular plate. Retaining ring splits (20) are fixedly mounted at both circumferential ends of the retaining ring body (19). The distance between the two groups of retaining ring splits (20) is greater than the diameter of the pressure relief port (6).

4. The protective device for a pressure relief valve according to claim 1, characterized in that: A valve body mounting plate (14) is integrally formed at the port of the exhaust port (2), and a shell cover plate (15) is movably mounted on the valve body mounting plate (14). The shell cover plate (15) is composed of two groups of semicircular blocks. The two groups of shell cover plates (15) are combined to form a circular plate around the exhaust port (2) behind the valve body mounting plate (14). A positioning rod (16) is integrally formed on the shell cover plate (15), and the positioning rod (16) corresponds to the fastening groove of the valve body mounting plate (14) one by one. The pressure relief shell (4) and the shell cover plate (15) are fastened together by fasteners (17).

5. The protective device for a pressure relief valve according to claim 1, characterized in that: One end of the pressure relief screw (3) extending into the exhaust port (2) forms a third joint surface (12), a pressure relief hole (13) is provided in the third joint surface (12), and the pressure relief hole (13) is composed of an axial groove and a radial groove interlaced, the third joint surface (12) is provided with an external thread and is threadedly connected to the exhaust port (2), and a sealing gasket is provided between the first joint surface (10) and the second joint surface (11).

6. A protective device for a pressure relief valve according to claim 5, characterized in that: The outer wall of the first joint surface (10) is provided with an external thread, the second joint surface (11) is provided with an internal thread, the first joint surface (10) and the second joint surface (11) are threadedly connected, and the outer wall of the third joint surface (12) is a smooth wall surface.

7. The protective device for a pressure relief valve according to claim 1, characterized in that: An end of the first combining surface (10) located outside the second combining surface (11) is provided with a groove forming an operating portion (9).

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