Integrated valve element with oil storage structure and built-in spring guiding function, safety valve comprising valve element and working method of safety valve

Abstract

The invention discloses an integrated valve element with an oil storage structure and a built-in spring guide, a safety valve comprising the valve element and a working method of the safety valve, and belongs to the technical field of safety valves. The valve element is a rotary body integrally machined and formed, the sealing end of a valve element body is a spherical sealing face, and the side wall is a cylindrical guide face. An oil storage groove is formed in the side, away from the spherical sealing face, of the side wall. The inner diameter of the shell is in clearance fit with the cylindrical guide face, one end of the spring is in clearance fit with the spring positioning cylindrical face, the other end of the spring is in assembly connection with the inner wall of the shell, and the shell chamfer is attached to the spherical sealing face. Assembling accumulative errors of a traditional split type structure are eliminated, the centering performance of the valve element and the valve seat is improved, the structural rigidity and action reliability are enhanced, deflection of the spring in the opening and closing process is avoided, the situation that a spring force acting line deviates from the axis of the valve element, and consequently lateral force is generated is prevented, and the problems of eccentric wear of a guide face and sealing leakage are effectively reduced.

Description

Technical Field

[0001] This invention relates to an integrated valve core with an oil storage structure and a built-in spring guide, a safety valve containing the valve core, and a method for operating the same, belonging to the field of safety valve technology. Background Technology

[0002] In the aerospace field, safety valves are critical components for preventing system pressure from exceeding limits. Their core performance requirements include: tight sealing at the set pressure, rapid opening in case of overpressure, accurate closing after pressure recovery, and long service life and high reliability.

[0003] Traditional safety valves typically employ a separate design for the valve core and spring guide structure. The valve core is responsible for sealing and guiding, while the spring applies force through a separate spring seat or valve cover structure. This separate structure involves numerous parts, leading to significant accumulated assembly errors and affecting the alignment of the valve core and seat. The lack of radial positioning of the spring can cause it to skew during frequent opening and closing, resulting in the spring force line deviating from the valve core axis, generating lateral forces, and exacerbating guide surface wear and sealing leakage. Insufficient lubrication of the guide surface makes it prone to adhesive wear and jamming under high pressure and high speed conditions. Furthermore, the head shape of traditional valve cores is often not adequately fluid-optimized, easily generating turbulence, cavitation, and hydraulic shock at the moment of opening, resulting in high noise and severe component erosion. Summary of the Invention

[0004] To address the problems existing in the background art, the present invention provides an integrated valve core with an oil storage structure and a built-in spring guide, a safety valve including the valve core, and a method for operating the same.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an integrated valve core with an oil storage structure and a built-in spring guide. The valve core is a rotary body integrally machined, including a valve core body. The sealing end of the valve core body is a spherical sealing surface, which is used to cooperate with the chamfer of the housing to achieve sealing. The side wall of the valve core body is a cylindrical guide surface, which is used to cooperate with the inner diameter of the housing. An oil storage groove is provided on the side of the side wall of the valve core body away from the spherical sealing surface, which is used to store lubricating medium. The inner wall of the valve core body is a spring positioning cylindrical surface, which is used to cooperate with the outer diameter of the spring to achieve radial positioning of the spring.

[0006] Furthermore, the number of oil storage tanks is at least one, and when the number of oil storage tanks is greater than one, all oil storage tanks are arranged parallel to each other along the axial direction of the valve core body.

[0007] A safety valve comprising an integrated valve core with an oil storage structure and a built-in spring guide includes a housing, a spring, and a valve core; the inner diameter of the housing is clearance-fitted with the cylindrical guide surface of the valve core, one end of the spring is clearance-fitted onto the spring positioning cylindrical surface of the valve core, the other end of the spring is fitted and connected to the inner wall of the housing, and the chamfer of the housing fits against the spherical sealing surface of the valve core to form a sealing pair.

[0008] Furthermore, the surface roughness of the spring positioning cylindrical surface is 1.6.

[0009] Furthermore, the chamfer angle of the housing is 45°-60°, and the surface roughness of the chamfer is no greater than 1.6.

[0010] Furthermore, the calculation process for the inner diameter of the spring positioning cylinder is as follows:

[0011] Step 1: Calculate the mean diameter of the spring in its free state. :

[0012]

[0013] In the formula:

[0014] This indicates the outer diameter of the spring in its free state;

[0015] Indicates the diameter of the spring steel wire cross section;

[0016] Step 2: Calculate the change in the outer diameter of the spring :

[0017]

[0018] In the formula:

[0019] This represents the spring pitch, where, Indicates coefficient;

[0020] Step 3: Calculate the outer diameter under the compressed spring condition. :

[0021]

[0022] Step 4: Calculate the inner diameter of the spring positioning cylinder. :

[0023]

[0024] In the formula:

[0025] This indicates the gap between the outer diameter of the spring under compressed state and the spring positioning cylindrical surface.

[0026] A method for operating a safety valve comprising an integrated valve core with an oil storage structure and a built-in spring guide, the method comprising the following steps:

[0027] S1: Insert the spring axially into the spring positioning cylindrical surface of the valve core to ensure that the axis of the spring coincides with the axis of motion of the valve core;

[0028] S2: Insert the valve core equipped with the spring from one end of the housing, so that the cylindrical guide surface of the valve core fits with the inner diameter of the housing, and fill the oil reservoir with lubricating medium.

[0029] S3: When the system pressure does not exceed the set value, the elastic force of the spring acts on the valve core, so that the spherical sealing surface fits tightly with the chamfer of the housing, thereby achieving system sealing;

[0030] S4: When the system pressure exceeds the set value, the pressure acts on the spherical sealing surface through the fluid, generating thrust and overcoming the elastic force of the spring, pushing the valve core to move axially, the spring is compressed, and the fluid is depressurized through the gap between the valve core and the housing;

[0031] S5: When the system pressure drops below the set value, the elastic restoring force of the spring pushes the valve core to return to its axial position, and the spherical sealing surface once again fits against the chamfer of the housing, restoring the safety valve to a sealed state.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This invention employs a one-piece machined rotary valve core structure, integrating sealing, guiding, and spring radial positioning functions into a single unit. This eliminates the accumulated assembly errors of traditional split structures, significantly improving the alignment of the valve core and valve seat, and enhancing structural rigidity and operational reliability. The spring's radial positioning is achieved through the spring positioning cylindrical surface on the inner wall of the valve core, preventing spring skewing during opening and closing, and preventing lateral forces caused by the spring force line deviating from the valve core axis. This effectively reduces guide surface wear and sealing leakage. The oil reservoir on the valve core sidewall stores lubricating medium, improving lubrication conditions on the guide surface, preventing adhesive wear and jamming under high-pressure and high-speed conditions, and extending the valve core's service life. The spherical sealing surface at the valve core sealing end matches the chamfer of the housing, optimizing the fluid flow state during opening and closing, reducing noise and component erosion damage caused by turbulence, cavitation, and hydraulic shock, ensuring the safety valve's long lifespan and high reliability under harsh conditions such as aerospace. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the valve core structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the safety valve of the present invention. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] An integrated valve core with an oil storage structure and built-in spring guidance is disclosed. The valve core is a rotary body integrally machined and includes a valve core body 1. The sealing end of the valve core body 1 is a spherical sealing surface 5, which is used to achieve a seal by engaging with the chamfer of the housing 6. The spherical sealing surface 5 has a radius of SR9±0.03 and a runout tolerance of 0.01, ensuring that the axis of the spherical sealing surface 5 is highly coincident with the theoretical rotation axis of the valve core, improving the self-centering ability of the spherical sealing surface 5, preventing eccentricity of the spherical sealing surface 5, ensuring the valve core's ability to resist erosion and its wear resistance, thereby improving the service life of the safety valve. The side wall of the valve core body 1 is a cylindrical guide surface 2, which is used to engage with the inner diameter of the housing 6. The inner diameter of the housing 6 is [missing information]. Based on this, the diameter of the cylindrical guide surface 2 is designed to be... The gap between the two is 0.02-0.06 mm. Reducing the gap between the housing 6 and the cylindrical guide surface 2 ensures proper guidance between them. The spherical sealing surface 5 and the cylindrical guide surface 2 transition smoothly, with the transition area polished smooth. The gap between the cylindrical guide surface 2 and the inner diameter of the housing 6 is very small. During the axial movement of the valve core inside the housing 6, the friction between the inner diameter of the housing 6 and the outer circumference of the valve core will hinder the valve core's movement, leading to jamming of the safety valve. To solve this problem, an oil reservoir 3 is provided on the side wall of the valve core body 1 away from the spherical sealing surface 5. The oil reservoir 3 is used to store lubricating medium; the width of the oil reservoir 3 is 2-4 mm, and the depth is 0.5-mm, reducing the contact area between the outer circumference of the valve core and the inner diameter of the housing, thus reducing friction. The inner wall of the valve core body 1 is a spring-positioning cylindrical surface 4, used to mate with the outer diameter of the spring 7 to achieve radial positioning of the spring 7. The spring positioning cylindrical surface 4 is the mating section for the spring 7. The spring 7 is installed into this section, and the spring positioning cylindrical surface 4 provides precise guidance for the spring 7. It mates with the outer diameter of the spring 7 to ensure that the force axis of the spring 7 coincides with the movement axis of the valve core, ensuring that the spring 7 does not deviate during multiple reciprocating movements, thus replacing the independent spring seat part in the traditional structure.

[0038] Furthermore, the number of oil storage tanks 3 is at least one. When the number of oil storage tanks 3 is greater than one, all oil storage tanks 3 are evenly distributed parallel to each other along the axial direction of the valve core body 1.

[0039] The present invention discloses a safety valve comprising an integrated valve core with an oil storage structure and a built-in spring guide, including a housing 6, a spring 7, and a valve core; the inner diameter of the housing 6 is clearance-fitted with the cylindrical guide surface 2 of the valve core, one end of the spring 7 is clearance-fitted onto the spring positioning cylindrical surface 4 of the valve core, and the other end of the spring 7 is assembled and connected to the inner wall of the housing 6; the chamfer of the housing 6 fits against the spherical sealing surface 5 of the valve core to form a sealing pair and perform a sealing function.

[0040] Furthermore, to prevent adhesive wear caused by contact between the outer diameter of the spring and the spring positioning cylindrical surface 4 when the spring 7 is deflected, the surface roughness of the spring positioning cylindrical surface 4 is 1.6, thereby reducing the coefficient of friction between the outer diameter of the spring 7 and the spring positioning cylindrical surface 4.

[0041] Furthermore, the chamfer angle of the housing 6 is 45°-60°, and the surface roughness of the chamfer is no greater than 1.6.

[0042] Furthermore, the minimum clearance between the diameter of the spring positioning cylindrical surface 4 and the outer diameter of the spring 7 under compressed state needs to be considered during the design to ensure that they do not jam. Therefore, a dimensional chain calculation is performed on the valve core to analyze the clearance between the spring 7 and the valve core. The calculation process for the inner diameter of the spring positioning cylindrical surface 4 is as follows:

[0043] Step 1: Calculate the mean diameter of the spring in its free state. :

[0044]

[0045] In the formula:

[0046] This indicates the outer diameter of the spring in its free state;

[0047] Indicates the diameter of the spring steel wire cross section;

[0048] Step 2: Calculate the change in the outer diameter of the spring :

[0049]

[0050] In the formula:

[0051] This represents the spring pitch, where, This represents a coefficient, ranging from 0.28 to 0.5.

[0052] Step 3: Calculate the outer diameter under the compressed spring condition. :

[0053]

[0054] Step 4: Calculate the inner diameter of the spring positioning cylinder 4 :

[0055]

[0056] In the formula:

[0057] This indicates the gap between the outer diameter of the spring under compressed state and the spring positioning cylindrical surface, which is 0.185 to 0.385 mm, to ensure that the two do not get stuck.

[0058] The present invention discloses a method for operating a safety valve comprising an integrated valve core with an oil storage structure and a built-in spring guide, the method comprising the following steps:

[0059] S1: Insert the spring 7 axially into the spring positioning cylindrical surface 4 of the valve core to ensure that the axis of the spring 7 coincides with the axis of motion of the valve core.

[0060] S2: Insert the valve core equipped with spring 7 from one end of housing 6, so that the cylindrical guide surface 2 of the valve core fits with the inner diameter of housing 6, and fill the oil reservoir 3 with lubricating medium.

[0061] S3: When the system pressure does not exceed the set value, the elastic force of the spring 7 acts on the valve core, so that the spherical sealing surface 5 and the chamfer of the housing 6 are tightly fitted, thereby achieving system sealing;

[0062] S4: When the system pressure exceeds the set value, the pressure acts on the spherical sealing surface 5 through the fluid, generating thrust and overcoming the elastic force of the spring 7, pushing the valve core to move axially, the spring 7 is compressed, and the fluid is depressurized through the gap between the valve core and the housing 6.

[0063] S5: When the system pressure drops below the set value, the elastic restoring force of the spring 7 pushes the valve core to return to its axial position, and the spherical sealing surface 5 is once again in contact with the chamfer of the housing 6, and the safety valve returns to a sealed state.

[0064] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An integrated valve core with an oil storage structure and a built-in spring guide, characterized in that: The valve core is a rotating body integrally machined, including a valve core body (1). The sealing end of the valve core body (1) is a spherical sealing surface (5), which is used to achieve sealing by cooperating with the chamfer of the housing (6). The side wall of the valve core body (1) is a cylindrical guide surface (2), which is used to cooperate with the inner diameter of the housing (6). An oil storage groove (3) is provided on the side of the side wall of the valve core body (1) away from the spherical sealing surface (5), which is used to store the lubricating medium. The inner wall of the valve core body (1) is a spring positioning cylindrical surface (4), which is used to cooperate with the outer diameter of the spring (7) to achieve radial positioning of the spring (7).

2. The integrated valve core with an oil storage structure and a built-in spring guide according to claim 1, characterized in that: The number of oil storage tanks (3) is at least one. When the number of oil storage tanks (3) is greater than one, all oil storage tanks (3) are arranged parallel to the axial direction of the valve core body (1).

3. A safety valve comprising an integrated valve core with an oil storage structure and a built-in spring guide as described in claim 1 or 2, characterized in that: It includes a housing (6), a spring (7) and a valve core; the inner diameter of the housing (6) is clearance-fitted with the cylindrical guide surface (2) of the valve core, one end of the spring (7) is clearance-fitted on the spring positioning cylindrical surface (4) of the valve core, the other end of the spring (7) is assembled and connected to the inner wall of the housing (6), and the chamfer of the housing (6) is fitted with the spherical sealing surface (5) of the valve core to form a sealing pair.

4. The safety valve according to claim 3, characterized in that: The surface roughness of the spring positioning cylindrical surface (4) is 1.

6.

5. The safety valve according to claim 3, characterized in that: The chamfer angle of the housing (6) is 45°-60°, and the surface roughness of the chamfer is not greater than 1.

6.

6. The safety valve according to claim 3, characterized in that: The calculation process for the inner diameter of the spring positioning cylindrical surface (4) is as follows: Step 1: Calculate the mean diameter of the spring in its free state. : In the formula: This indicates the outer diameter of the spring in its free state; Indicates the diameter of the spring steel wire cross section; Step 2: Calculate the change in the outer diameter of the spring : In the formula: This represents the spring pitch, where, Indicates coefficient; Step 3: Calculate the outer diameter under the compressed spring condition. : Step 4: Calculate the inner diameter of the spring positioning cylindrical surface (4). : In the formula: This indicates the gap between the outer diameter of the spring under compressed state and the spring positioning cylindrical surface.

7. A method for operating the safety valve according to claim 6, characterized in that: The method includes the following steps: S1: Insert the spring (7) axially into the spring positioning cylindrical surface (4) of the valve core to ensure that the axis of the spring (7) coincides with the axis of motion of the valve core. S2: Insert the valve core equipped with spring (7) from one end of the housing (6) so that the cylindrical guide surface (2) of the valve core fits with the inner diameter of the housing (6) and fills the oil reservoir (3) with lubricating medium. S3: When the system pressure does not exceed the set value, the elastic force of the spring (7) acts on the valve core, so that the spherical sealing surface (5) and the chamfer of the housing (6) fit tightly together, thereby achieving system sealing; S4: When the system pressure exceeds the set value, the pressure acts on the spherical sealing surface (5) through the fluid, generating thrust and overcoming the elastic force of the spring (7), pushing the valve core to move axially, the spring (7) is compressed, and the fluid is depressurized through the gap between the valve core and the housing (6); S5: When the system pressure drops below the set value, the elastic restoring force of the spring (7) pushes the valve core to return to its axial position, and the spherical sealing surface (5) is once again in contact with the chamfer of the housing (6), and the safety valve returns to a sealed state.

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