Safety valve with composite valve element

Abstract

The composite valve element safety valve comprises a valve body, a plunger valve element, a conical valve element, a main spring, an auxiliary spring, a valve seat, an adjusting threaded sleeve and a locking nut, the front end of the valve body is machined to be of a mouthpiece structure and serves as an air inlet connecting end, the rear end of the valve body is in threaded connection with the adjusting threaded sleeve, the valve seat is in threaded connection with the interior of the valve body, and the plunger valve element is connected to the outer wall of the front side of the valve seat in a sleeved mode. An inner hole in the rear side of the valve seat is sleeved with a conical valve element, an auxiliary spring is installed in an auxiliary spring cavity, the two ends of the auxiliary spring abut against the plunger valve element and the valve seat respectively, a main spring is installed in a main spring cavity, the two ends of the main spring abut against the conical valve element and the adjusting threaded sleeve respectively, and a ventilation flow channel is formed in the side wall of the valve body. The pressure relief valve is compact in structure, stable in performance and reliable in work, the characteristics of the conical valve element and the plunger valve element are combined, the requirements for high pressure, quick response, precision control, large-flow pressure relief, small size and the like can be met at the same time, graded pressure relief is achieved, impact caused by sudden opening of the valve element due to pressure rise is avoided, and large-flow discharge pressure relief is also ensured.

Description

Technical Field

[0001] This invention belongs to the field of safety valve technology, and specifically relates to a composite valve core safety valve. Background Technology

[0002] Safety valves, as protective components in a system, play a crucial role in protecting the system from overpressure and are therefore widely used. Safety valves come in various structural forms, primarily categorized by valve core structure into cone-type and plunger-type safety valves. Traditional safety valves mainly employ a single valve core structure, which makes it difficult for them to simultaneously meet requirements such as high pressure, rapid response, precise control, large flow rate pressure relief, and small size.

[0003] For example, the "high-flow safety valve" disclosed in application number CN2015106170833 uses a conical valve core and valve seat, which has the characteristics of good sealing, rapid opening and closing, and high-flow pressure relief, but the requirements for opening and closing pressure and precision control are not high. Another example is the "spring-loaded safety valve" disclosed in CN 22052336U, which uses a plunger-type valve core, has a simple structure, and can achieve high pressure and precision control. However, if the flow rate is large, it is necessary to increase the effective working area of ​​the plunger to meet the flow demand. This increased size has certain limitations for safety valves with strict space requirements. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a composite valve core safety valve that combines the fast response of a conical valve core with the high sealing and precise control characteristics of a plunger valve core, thus solving the problem that safety valves with a single valve core structure cannot simultaneously meet the requirements of high pressure, fast response, precise control, large flow pressure relief, and small size.

[0005] The technical solution adopted in this invention is: a composite valve core safety valve, comprising a valve body, a plunger valve core, a conical valve core, a main spring, a secondary spring, a valve seat, an adjusting sleeve, and a locking nut. The valve body has a stepped annular structure, with the front end of the valve body machined into a nozzle structure for air inlet connection. The rear end of the valve body is threadedly connected to the adjusting sleeve. The valve seat is threadedly connected to the valve body. The plunger valve core is sleeved on the front outer wall of the valve seat, and the conical valve core is sleeved on the rear inner hole of the valve seat. The plunger valve core, valve seat, and conical valve core divide the valve body into three cavities from front to back, respectively... The valve body consists of an intake chamber, a secondary spring chamber, and a main spring chamber. The cavity between the plunger valve core and the intake connection end forms the intake chamber. The cavity between the plunger valve core and the valve seat forms the secondary spring chamber, in which the secondary spring is installed. The two ends of the secondary spring rest on the plunger valve core and the valve seat, respectively. The cavity between the conical valve core and the adjusting screw sleeve forms the main spring chamber, in which the main spring is installed. The two ends of the main spring rest on the conical valve core and the adjusting screw sleeve, respectively. An air passage is provided on the side wall of the valve body located in the secondary spring chamber. A locking nut is used to lock the adjusting screw sleeve.

[0006] Preferably, a rubber ring groove is provided inside the valve body, the rubber ring groove is located between the plunger valve core and the valve body, and a rubber ring is installed in the rubber ring groove.

[0007] Preferably, the plunger valve core sidewall is machined with a radially penetrating plunger pressure relief hole, which is located in front of the rubber ring when the safety valve is not open.

[0008] Preferably, the front end of the conical valve core is a cone, the cone of the conical valve core is connected to the circular hole at the front end of the valve seat, a plastic ring is installed on the outer periphery of the circular hole of the valve seat and sealed to the cone at the front end of the conical valve core, the middle section of the conical valve core is a cylinder, and multiple U-shaped flow channels are evenly distributed on the outer circumference of the cylinder in the middle section. The rear end of the conical valve core is a circular groove with a diameter larger than that of the middle section, and a deep hole is provided at the bottom of the groove facing the middle section.

[0009] Preferably, the plunger valve core has a stepped annular structure, with the diameter of the front annular body being larger than that of the rear annular body. The outer diameter of the front annular body matches the inner diameter of the corresponding position of the valve body, and the inner diameter of the rear annular body matches the outer diameter of the front side of the valve seat. The stepped end faces formed on the front and rear sides are used to install the auxiliary spring.

[0010] The beneficial effects of this invention are: the invention has a compact structure, reduces redundant parts, has stable performance, and is reliable in operation. It combines the characteristics of conical valve core and plunger valve core, and can simultaneously meet the requirements of high pressure, fast response, precise control, large flow pressure relief, and small size. It achieves staged pressure relief. The plunger valve core first performs a micro-opening to avoid the impact caused by the sudden opening of the valve core when the pressure rises, and then the conical valve core opens to ensure large flow discharge pressure relief. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a composite valve core safety valve structure.

[0012] Figure 2 This is a schematic diagram of the air passage in a slightly open state after operation.

[0013] Figure 3 This is a schematic diagram of the fully open air passage after operation.

[0014] Figure 4 This is a schematic diagram of the U-shaped flow channel of a conical valve core.

[0015] Figure 5 This is a schematic diagram of the assembly and debugging of the plunger valve core.

[0016] Reference numerals: 1-Valve body, 2-Plunger valve core, 3-Rubber ring, 4-Plastic ring, 5-Secondary spring, 6-Valve seat, 7-Conical valve core, 8-Main spring, 9-Locking nut, 10-Adjusting screw sleeve, 11-Process plug, 12-Sealing ring, 101-Inlet chamber, 102-Secondary spring chamber, 103-Main spring chamber, 104-Air passage, 201-Plunger pressure relief hole, 701-U-shaped flow channel. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Figure 1 The left side of the view is the front of the overall structure. Figure 1 The right side of the view is the rear of the overall structure.

[0018] The principle of this invention is as follows: This invention adopts a composite structure design for two types of valve cores, inheriting the advantages of two single valve cores in terms of performance, and reducing redundant parts through simplified design in terms of structure. The plunger valve core 2 and the conical valve core 7 are connected together by the valve seat 6 to form a coaxial composite valve core mechanism. The plunger valve core 2 forms a kinematic pair with the inner cylindrical surface of the valve body 1 and the outer cylindrical surface of the valve seat 6, guided by the contact surface. The left and right movement of the plunger valve core 2 is controlled by the balance between the pressure in the intake chamber 101 and the spring force of the secondary spring 5, achieving the function of opening and closing. The conical valve core 7 is guided by the cylindrical surface that mates with the inside of the valve seat 6, and its opening and closing are also controlled by the balance between the pressure in the intake chamber 101 and the spring force of the main spring 8. During operation, the plunger valve core 2 moves first, followed by the conical valve core 7, achieving a process of initial slight opening followed by large-flow pressure relief, avoiding the impact caused by the valve core suddenly opening fully when the system is overpressured. During the closing process, the cone valve core 7 moves first, followed by the plunger valve core 2, to achieve rapid closing and ensure the sealing performance of the safety valve.

[0019] like Figure 1As shown, a composite valve core safety valve includes a valve body 1, a plunger valve core 2, a rubber ring 3, a plastic ring 4, a conical valve core 7, a main spring 8, a secondary spring 5, a valve seat 6, a locking nut 9, and an adjusting sleeve 10. The valve body 1 has a stepped annular structure. The front end of the valve body 1 is machined into a connector structure for the air inlet connection end. The rear end of the valve body 1 is threadedly connected to the adjusting sleeve 10. The valve seat 6 is threadedly connected inside the valve body 1. The plunger valve core 2 is sleeved on the front outer wall of the valve seat 6, and the conical valve core 7 is sleeved on the rear inner hole of the valve seat 6. The plunger valve core 2, the valve seat 6, and the conical valve core 7 divide the valve body 1 into three chambers from front to back: an air inlet chamber 101, a secondary spring chamber 102, and a main spring chamber 103. The chamber between the plunger valve core 2 and the air inlet connection end constitutes the air inlet chamber 101. The air inlet chamber 101 is connected to the system interior. When the system experiences overpressure, the gas generates pressure in the air inlet chamber 101, activating the safety valve. A secondary spring cavity 102 is formed between the plunger valve core 2 and the valve seat 6. An air passage 104 is provided on the valve body side wall of the secondary spring cavity 102. A secondary spring 5 is installed in the secondary spring cavity 102, with its two ends resting against the plunger valve core 2 and the valve seat 6, respectively. The secondary spring cavity 102 serves two purposes: firstly, it houses the secondary spring 5; secondly, the pressure released from the plunger valve core 2 enters the secondary spring cavity 102 and is discharged into the atmosphere through the air passage 104. A main spring cavity 103 is formed between the conical valve core 7 and the adjusting sleeve 10. A main spring 8 is installed in the main spring cavity 103, with its two ends resting against the conical valve core 7 and the adjusting sleeve 10, respectively. The main spring cavity 103 serves two purposes: firstly, it houses the main spring 8; secondly, the pressure released from the conical valve core 7 enters the main spring cavity 103 through the U-shaped flow channel 701 and is then discharged into the atmosphere. A rubber ring groove is provided inside the valve body 1, located between the plunger valve core 2 and the valve body 1. A rubber ring 3 is installed in the rubber ring groove. The locking nut 9 is used to lock the adjusting sleeve 10. The valve seat 6 has three functions: first, it is used to install the conical valve core 7; second, a non-metallic plastic ring 4 is embedded in the outer circumference of the round hole of the valve seat 6 to achieve the sealing of the conical valve core 7; and third, the valve seat 6 is connected to the valve body 1 by threads for the pressure adjustment of the plunger valve core 2.

[0020] The side wall of the plunger valve core 2 is machined with a radially penetrating plunger pressure relief hole 201. When the safety valve is not open, the plunger pressure relief hole 201 is located in front of the rubber ring 3. The plunger valve core 2 has a stepped ring structure, with the diameter of the front ring being larger than that of the rear ring. The outer diameter of the front ring matches the inner diameter of the corresponding position of the valve body 1, and the inner diameter of the rear ring matches the outer diameter of the front side of the valve seat 6. The stepped end faces formed by the front and rear sides are used to install the auxiliary spring 5.

[0021] like Figure 1 and Figure 4As shown, the front end of the conical valve core 7 is a cone, and the cone of the conical valve core 7 is connected to the circular hole at the front end of the valve seat 6. A plastic ring 4 is installed on the outer periphery of the circular hole of the valve seat 6 and is sealed to the cone at the front end of the conical valve core 7. The middle section of the conical valve core 7 is a cylinder, and four U-shaped flow channels 701 are evenly distributed along the axial direction on the outer circumference of the cylinder in the middle section. The rear end of the conical valve core 7 is a circular groove with a diameter larger than that of the middle section. A deep hole is provided at the bottom of the groove facing the middle section to increase the volume of the main spring cavity 103 and reduce the weight.

[0022] like Figure 5 As shown, the safety valve is installed and debugged in the order of "plunger valve core 2 first, then conical valve core 7". First, install the rubber ring 3, plunger valve core 2, auxiliary spring 5, and valve seat 6 in sequence. Use a specific process plug 11 and sealing ring 12 to seal the position of the conical valve core 7. Then, adjust the opening and closing pressures of the plunger valve core 2 by adjusting the position of the valve seat 6. After debugging, tighten the threads of the valve seat 6. Then, remove the process plug 11 and install the conical valve core 7, main spring 8, adjusting sleeve 10, and locking nut 9. Adjust the adjusting sleeve 10 according to the full-open pressure and flow requirements to meet the requirements. After debugging, tighten the locking nut 9. At this point, the safety valve is ready for long-term storage and use.

[0023] The safety valve operates as follows: Under normal operating conditions, when the system pressure is lower than the safety valve's set value, the composite structure of the plunger valve core 2 and the conical valve core 7 is in the closed state. Under the action of the auxiliary spring 5, the plunger relief orifice 201 of the plunger valve core 2... Figure 1 The indicated position is where the plunger pressure relief hole 201 is located to the left of the rubber ring 3. The rubber ring 3 ensures a seal at the plunger valve core 2 position; simultaneously, the conical valve core 7, under the action of the main spring 8, achieves a seal with the valve seat 6. Figure 2 As shown, when the system pressure reaches the safety valve's set opening pressure, it first disrupts the balance of the plunger valve core 2, causing the plunger valve core 2 to begin moving towards... Figure 1 As shown in the diagram, when the plunger pressure relief hole 201 moves to the right side of the rubber ring 3, the airflow flows out from the plunger pressure relief hole 201 and the gap between the plunger valve core 2 and the valve body 1, and is discharged into the atmosphere through the air passage 104. This achieves a small amount of pressure relief to prevent the impact caused by the valve core suddenly opening fully in case of overpressure. The air passage during this process is as follows: Figure 2 As indicated by the arrow. If the system pressure continues to rise or the flow rate requirement cannot be met through the plunger relief hole 201, causing the pressure to increase, the increased pressure will resist the force of the main spring 8 acting on the conical valve core 7, causing the conical valve core 7 to quickly move towards... Figure 1 The movement to the right, as shown, allows the conical valve core 7 to open rapidly. Airflow exits from the U-shaped channel 701 of the conical valve core 7, enters the main spring chamber 103, and is discharged into the atmosphere through the through-hole of the adjusting sleeve 10. This achieves high-flow-rate pressure relief. The airflow passage in this process is as follows: Figure 3 The arrow indicates the direction.

[0024] During the depressurization and reseating process, when the pressure decreases and the system returns to its normal operating pressure, the conical valve core 7 closes quickly under the force of the main spring 8, followed by the piston valve core 2, achieving a sealing effect.

[0025] The above describes specific embodiments of the present invention and the technical principles employed. Any modifications or equivalent transformations based on the technical solutions of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite spool safety valve characterized by: The valve body, plunger valve core, tapered valve core, main spring, auxiliary spring, valve seat, adjusting sleeve and locking nut are arranged, the valve body is a stepped annular structure, the front end of the valve body is processed into a mouth structure as a gas inlet connecting end, the rear end of the valve body is threadedly connected with the adjusting sleeve, the valve seat is threadedly connected in the valve body, the plunger valve core is sleeved on the front side outer wall of the valve seat, the tapered valve core is sleeved in the rear side inner hole of the valve seat, the plunger valve core, the valve seat and the tapered valve core divide the valve body into three cavities from front to back, namely a gas inlet cavity, an auxiliary spring cavity and a main spring cavity, the cavity between the plunger valve core and the gas inlet connecting end forms the gas inlet cavity, the cavity between the plunger valve core and the valve seat forms the auxiliary spring cavity, the auxiliary spring is arranged in the auxiliary spring cavity, the two ends of the auxiliary spring are respectively abutted on the plunger valve core and the valve seat, the cavity between the tapered valve core and the adjusting sleeve forms the main spring cavity, the main spring is arranged in the main spring cavity, the two ends of the main spring are respectively abutted on the tapered valve core and the adjusting sleeve, the valve body side wall in the auxiliary spring cavity is provided with a gas flow channel, and the locking nut is used for locking the adjusting sleeve.

2. A combined valve trim safety valve according to claim 1, characterized in that: The valve body is internally provided with a rubber ring groove, the rubber ring groove is located between the plunger valve core and the valve body, and a rubber ring is arranged in the rubber ring groove.

3. A combined valve trim safety valve according to claim 2, characterized in that: The plunger valve core side wall is processed with a radial through plunger pressure relief hole, and the plunger pressure relief hole is located in front of the rubber ring in the unopened state of the safety valve.

4. The combined valve trim safety valve of claim 1, wherein: The tapered valve core front end is a cone body, the tapered valve core cone body is butt-jointed on the valve seat front end circular hole, the valve seat circular hole outer periphery is provided with a plastic ring for sealing butt-joint with the tapered valve core front end cone body, the tapered valve core middle section is a cylinder, a plurality of U-shaped flow channels are uniformly distributed on the outer periphery of the middle section cylinder in the axial direction, the rear end of the tapered valve core is a circular groove with a diameter larger than the middle section, and a deep hole is arranged on the groove bottom and faces the middle section.

5. The combined valve trim safety valve of claim 1, wherein: The plunger valve core is a stepped annular structure, the front side ring body diameter is larger than the rear side ring body diameter, the front side ring body outer diameter is matched with the valve body corresponding position inner diameter, the rear side ring body inner diameter is matched with the valve seat front side outer diameter, and the stepped end faces formed by the front and rear sides are used for mounting the auxiliary spring.

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