Self-operated zero-leakage fireproof relief threaded valve

Abstract

The utility model discloses a self-operated zero-leakage fireproof discharge threaded valve which comprises a valve body, a valve element, a valve sleeve, a fusible metal column and a temperature conduction pressing sleeve. The valve body is sequentially provided with a medium sealing shaft section, a pressure relief shaft section, a thread sealing shaft section and a hexagonal clamping end in a step shape, a medium outlet hole is formed in one end of the valve body, a transition hole is formed in the pressure relief shaft section and connected with the medium outlet hole, and medium pressure relief holes are formed in the circumferential face of the pressure relief shaft section. The valve element is arranged in the matching middle hole in a penetrating mode, one end of the valve element is provided with a sealing cone end matched with an orifice of the medium outlet hole, the temperature conduction pressing sleeve is connected with the valve sleeve, the fusible metal column is embedded in the temperature conduction pressing sleeve, and the valve element is supported by the fusible metal column. The threaded valve is simple in structure, easy to assemble and reliable in sealing in a normal-temperature state, the fault and failure probability of the valve element is reduced, and the reliability of medium storage and transportation is improved; and in case of fire and high temperature, the valve core is subjected to three-stage sealing, so that leakage during pressure relief can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of fireproof valves, in particular to a self-operated zero-leakage fireproof discharge threaded valve. Background Art

[0002] Chemical storage and transportation involves a large number of flammable, explosive, toxic and harmful substances. Once a fire accident occurs, the consequences are often extremely serious. If the accident cannot be stopped in time, it will not only cause huge property losses, but also endanger the lives and ecological environment of personnel.

[0003] Existing fire-proof pressure relief valves are generally provided with heat-sensitive elements and elastic elements. Under normal conditions, the heat-sensitive elements and the elastic elements maintain balance, and pressure is applied to the valve core used for sealing to maintain its state. When a fire occurs, the heat-sensitive elements melt and cannot maintain balance, and the valve core moves to switch the valve state to achieve the purpose of explosion prevention during fire. The performance reliability of fire-proof pressure relief valves is particularly important. The more complex the structure, the lower its working reliability. In particular, the elastic element is a key element for force balance. When used in the storage and transportation of corrosive liquids, it is susceptible to corrosion and its elastic properties are affected. If brittle fracture, plastic deformation or fatigue fracture occurs under long-term support, it will cause the failure of pressure relief when a fire occurs. In addition, temperature fluctuations or abnormal vibrations during storage and transportation will cause the balance support of the elastic element to fail, resulting in abnormal pressure relief.

[0004] In addition, existing fire-proof pressure relief valves generally use rubber sealing rings as the seal of the valve core. Under the high temperature environment of a fire, the sealing ring is prone to plastic deformation, resulting in sealing failure. Leakage of flammable liquids in storage and transportation will increase the momentum of the fire. Alternatively, the sealing ring may become cemented, resulting in the valve core being unable to move and switch the valve state, thereby failing to effectively and timely release pressure. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a self-operated zero-leakage fire-proof discharge threaded valve to solve one or more problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A self-operated zero-leakage fire-proof discharge threaded valve, comprising a valve body, a valve core, a valve sleeve, a fusible metal column and a temperature-conducting pressure sleeve; wherein,

[0008] The valve body is installed horizontally on the valve actuator, and is provided with a medium sealing shaft section, a pressure relief shaft section, a threaded sealing shaft section and a hexagonal clamp end in a stepped shape in sequence. One end of the valve body is provided with a medium outlet hole connected to the inside of the storage tank, and a transition hole is provided in the pressure relief shaft section, and the transition hole is connected to the medium outlet hole. Several medium pressure relief holes connected to the transition holes are provided on the circumference of the pressure relief shaft section for connecting with the pressure relief bypass branch;

[0009] One end of the valve sleeve is inserted into the other end of the valve body, and a matching center hole is opened at the one end;

[0010] The valve core is inserted into the matching center hole to support and guide the movement of the valve core. A sealing cone end is provided at one end thereof to match the orifice of the medium outlet hole to realize a conical seal. The center axis of the valve core is located on the center line of the medium outlet hole.

[0011] The other end of the temperature-conducting pressure sleeve is threadedly connected to the valve sleeve, the fusible metal column is embedded in the embedding hole of the temperature-conducting pressure sleeve, and the other end face of the valve core is only supported by the end face of the fusible metal column. After the temperature-conducting pressure sleeve is tightened, the fusible metal column presses the valve core to provide hard sealing pressure.

[0012] Furthermore, a melt flow hole is formed through the temperature-conducting pressure sleeve, and the melt flow hole is vertical and connected to the embedding hole.

[0013] Furthermore, the other end of the valve core is a matching shaft section, and the matching shaft section and the matching middle hole are grinded to form a sealed plug-in fit.

[0014] Furthermore, the valve core also includes an end shaft at one end and a supporting cam shaft section located between the end shaft and the mating shaft section. The supporting cam shaft section is biased to one side of the medium pressure relief hole. The supporting cam shaft section cooperates with the transition hole and always remains plugged into the transition hole during the movement of the valve core.

[0015] Furthermore, the supporting convex shaft section is transitionally connected to the matching shaft section through a sealing limiting conical surface, which is used to limit the valve core position and the conical sealing matching center hole under the extreme pressure relief state.

[0016] Compared with the prior art, the self-operated zero-leakage fire-proof discharge threaded valve of the utility model has the following beneficial effects:

[0017] The threaded valve has a simple structure, is easy to assemble, and works reliably. By eliminating the balancing support of the elastic element and using a fusible metal column to adjustably press and support the valve core to achieve conical surface pressure sealing, the sealing is reliable at normal temperature and is not subject to leakage due to abnormal hydraulic fluctuations, thereby reducing the probability of valve core failure and ineffectiveness and improving the reliability of medium storage and transportation. When the fire is hot, the valve core loses its support, and the medium liquid's own hydraulic pressure is used to drive the valve core to move and release pressure, and a three-level seal is formed on the valve core, which can effectively prevent the leakage of flammable pressure relief media during fire pressure relief, aggravating the disaster. Unlike the soft seal of the sealing ring in the prior art, the three-level seal is a matching seal and a pressure cone seal, which can avoid leakage caused by failure of the sealing ring at high temperature, or the influence of the sealing ring bonding on the pressure relief action of the valve core, thereby ensuring the fireproof, explosion-proof and leak-proof performance of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the discharge threaded valve of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the discharge threaded valve of the utility model.

[0020] In the figure: 1. valve body; 11. medium outlet hole; 12. medium pressure relief hole; 13. pressure relief shaft section; 14. medium sealing shaft section; 15. threaded sealing shaft section; 2. valve core; 21. sealing cone end; 22. supporting convex shaft section; 23. sealing limit cone surface; 24. matching shaft section; 3. valve sleeve; 31. matching center hole; 4. fusible metal column; 5. temperature conducting pressure sleeve; 51. melt flow hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only the best embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] A self-operated zero-leakage fire-proof discharge threaded valve in this embodiment is horizontally installed on the actuator control circuit of the tank valve, the actuator is connected to the accumulator through a pressure relief bypass branch, the pressure relief bypass branch is connected to the actuator control circuit, and the actuator control valve is closed by driving the discharge threaded valve to prevent further outflow of the medium;

[0023] Since the discharge threaded valve is connected to the medium liquid circuit and is subjected to the hydraulic pressure, the discharge threaded valve of this embodiment uses the pressure of the medium liquid itself to discharge the pressure. Figure 1-Figure 2 As shown, it includes a valve body 1, a valve core 2, a valve sleeve 3, a fusible metal column 4 and a temperature-conducting pressure sleeve 5. The fusible metal column 4 is solidified in the embedding hole of the temperature-conducting pressure sleeve 5 at room temperature, and the fusible metal column 4 supports the valve core 2 to provide a sealing support force;

[0024] Among them, the valve body 1 is installed in the actuator and connected to the pressure relief bypass branch. Figure 1 and Figure 2The outer periphery of the valve body 1 is stepped and sequentially provided with a medium sealing shaft section 14, a pressure relief shaft section 13, a threaded sealing shaft section 15 and a hexagonal clamping end. A sealing ring is provided on the front end of the medium sealing shaft section 14 to block the sealing actuator interface. The threaded sealing shaft section 15 is threadedly connected with the interface to provide the valve body 1 with overall sealing and sealing pressure. The pressure relief shaft section 13 is aligned and located in the pressure relief bypass branch. The hexagonal clamping end is convenient for tool operation and tightening. The valve body 1 is provided with a medium outlet hole 11, a transition hole and a valve sleeve mounting screw hole in a sequential step from the front end to the rear end. The medium outlet hole 11 is connected to the inside of the storage tank. The transition hole is located in the pressure relief shaft section 13. A number of medium pressure relief holes 12 that vertically penetrate to the transition hole are evenly and annularly provided on the circumference of the pressure relief shaft section 13 to connect the transition hole and the pressure relief bypass branch.

[0025] The valve sleeve 3 serves as a sealing and guiding body of the valve core 2, and its threaded end is installed in the valve sleeve mounting screw hole, and its hexagonal head end is used for tool operation. The valve sleeve 3 is connected and connected to form a matching center hole 31 and a compression sleeve mounting screw hole;

[0026] The valve core 2 is inserted into the matching middle hole 31. Different from the sealing ring used in the prior art, in order to improve the reliability of the valve core 2, the valve core 2 adopts the sealing cooperation between the axial surface and the inner wall of the matching middle hole 31. The matching shaft section 24 of the valve core 2 and the matching middle hole 31 of the valve sleeve 3 are plugged and grinded to form a sealing assembly to ensure the sealing reliability; the central axis of the valve core 2 is aligned and located on the center line of the medium outlet hole 11. The front end of the valve core 2 is an end shaft, and a sealing cone end 21 is provided at the end of the end shaft, which cooperates with the orifice of the medium outlet hole 11 A conical seal is realized; a leakage channel is provided between the circumference of the end shaft and the transition hole, a supporting convex shaft section 22 is provided between the end shaft and the matching shaft section 24, and the supporting convex shaft section 22 is clearance-matched with the transition hole to provide further support for the valve core 2 and maintain its rigidity. The contact area between the supporting convex shaft section 22 and the transition hole should be offset to avoid the medium pressure relief hole 12, and during the movement between the sealing position and the limit pressure relief position of the valve core 2, the supporting convex shaft section 22 always maintains contact and mating with the transition hole to serve as a primary seal for the medium;

[0027] The temperature-conducting pressure sleeve 5 is made of a metal material with good temperature-conducting performance. The threaded end of the temperature-conducting pressure sleeve 5 is installed in the pressure sleeve installation screw hole of the valve sleeve 3 and seals the port of the valve sleeve 3. The outer diameter of the fusible metal column 4 should be larger than the outer diameter of the matching shaft section 24 of the valve core 2. It is interference-fitted into the embedding hole of the temperature-conducting pressure sleeve 5. The other end face of the valve core 2 is only supported by the end face of the fusible metal column 4 to ensure that the valve core 2 can move after the fusible metal column 4 melts at high temperature and unloads the pressing force. The hydraulic pressure of the liquid medium is used to push the valve core 2 to move, cutting through the medium outlet hole 11 and the medium pressure relief hole 12. Under normal temperature, after the temperature-conducting pressure sleeve 5 is tightened, the fusible metal column 4 presses the other end of the valve core 2 to provide a hard sealing support force for the sealing cone end 21, so that the sealing performance reaches zero leakage; in order to prevent the molten metal liquid of the fusible metal column 4 from being unable to be discharged in time after being heated, affecting the timely pressure relief action of the valve core 2, a molten flow hole 51 is provided on the hexagonal head end of the temperature-conducting pressure sleeve 5 through the embedding hole vertically, and there are at least two molten flow holes 51, which are evenly distributed in an annular shape to ensure that at any screwing angle, there is a molten flow hole 51 inclined downward to facilitate the discharge of the molten metal liquid.

[0028] In addition, the supporting convex shaft section 22 is transitionally connected to the mating shaft section 24 through the sealing limit cone surface 23. During matching and grinding, the sealing limit cone surface 23 and the orifice of the matching center hole 31 simultaneously realize mutual grinding and precision sealing. When the rigid support of the fusible metal column 4 is lost, the valve core 2 pushed by the medium hydraulic force limits the maximum movement position of the valve core 2 through the sealing limit cone surface 23. At the same time, under the action of the medium hydraulic force, the sealing limit cone surface 23 is used as the secondary seal of the valve core 2. The greater the pressure, the more reliable the seal. The matching seal between the valve core 2 and the matching center hole 31 is a tertiary seal. Therefore, with the support of the tertiary seal, in a fire environment, the discharge threaded valve can not only realize reliable pressure relief, but also minimize the possibility of leakage of the valve core 2.

[0029] The directional words such as "front", "inside", "outside", "end" and "side" mentioned in this article are described based on Figure 1-Figure 2 These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation;

[0030] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to the specific circumstances;

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-operated zero-leakage fire-proof discharge threaded valve, characterized in that: It includes a valve body, a valve core, a valve sleeve, a fusible metal column and a temperature-conducting pressure sleeve; wherein, The valve body is horizontally mounted on the valve actuator, and is provided with a medium sealing shaft section, a pressure relief shaft section, a threaded sealing shaft section and a hexagonal clamp end in a stepped manner in sequence. One end of the valve body is provided with a medium outlet hole connected to the inside of the storage tank, and a transition hole is provided in the pressure relief shaft section, and the transition hole is connected to the medium outlet hole. A plurality of medium pressure relief holes connected to the transition holes are provided on the circumference of the pressure relief shaft section for communicating with the pressure relief bypass branch. One end of the valve sleeve is inserted into the other end of the valve body, and a matching center hole is opened at one end of the valve sleeve; The valve core is inserted into the matching center hole to support and guide the movement of the valve core. A sealing cone end is provided at one end thereof to match the orifice of the medium outlet hole to realize a conical seal. The center axis of the valve core is located on the center line of the medium outlet hole. The temperature-conducting pressure sleeve is threadedly connected to the other end of the valve sleeve, the fusible metal column is embedded in the embedding hole of the temperature-conducting pressure sleeve, and the other end face of the valve core is only supported by the end face of the fusible metal column. After the temperature-conducting pressure sleeve is tightened, the fusible metal column presses the valve core to provide hard sealing pressure.

2. The self-operated zero-leakage fire-proof discharge threaded valve according to claim 1 is characterized in that: The temperature-conducting pressure sleeve is provided with a molten flow hole which is perpendicular to and connected with the embedding hole.

3. The self-operated zero-leakage fire-proof discharge threaded valve according to claim 1 is characterized in that: The other end of the valve core is a matching shaft section, and the matching shaft section and the matching center hole are grinded to form a sealed plug-in fit.

4. The self-operated zero-leakage fire-proof discharge threaded valve according to claim 3 is characterized in that: The valve core also includes an end shaft at one end and a supporting cam shaft section located between the end shaft and the mating shaft section, wherein the supporting cam shaft section is offset to one side of the medium pressure relief hole, and the supporting cam shaft section is mated with the transition hole and always remains plugged into the transition hole during the movement of the valve core.

5. The self-operated zero-leakage fire-proof discharge threaded valve according to claim 4 is characterized in that: The supporting convex shaft section is transitionally connected to the matching shaft section via a sealing limiting conical surface, and is used to limit the position of the valve core under an extreme pressure relief state and to conically seal the matching center hole.

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