A switching valve for fire prevention and control

Abstract

The present invention provides a switching valve for fire prevention and control, comprising: a housing, the housing including an inlet, an outlet, and a fusible unit; a valve core mechanism, the valve core mechanism including a valve core unit and a damping unit; one end of the damping unit is connected to the housing, the other end of the damping unit is connected to the valve core unit, one end of the valve core unit is connected to the fusible unit, and the other end of the valve core unit is respectively matched with the inlet and the outlet. When a fire occurs, the physical state of the fusible unit changes due to heat, and then the valve core unit has a tendency to move towards the fusible unit. At the same time, the damping unit elongates, driving the valve core mechanism to move towards the direction close to the fusible unit, so that the inlet and the outlet are communicated. It realizes the opening control of the switching valve under the state of being heated or in a fire, avoiding the situation that the valve cannot be opened due to power failure, poor reliability, etc., and improving the use reliability and safety.

Description

Technical Field

[0001] The present invention relates to the field of control technologies, and particularly to a switching valve for fire prevention and control. Background Art

[0002] In industrial sites in fields such as oil and gas pipelines, chemical industry, refining, oil depots, tank farms, wharves, and metallurgy, many internal pipeline valves transport flammable gases and liquids. When an accidental fire occurs at the site, it is necessary to promptly change the opening or closing state of the valves, thereby controlling the non-diffusion of combustible media outward, which is a key measure to reduce personal and property losses at the site. Generally, after a fire occurs, the valve actuator often loses external power, resulting in loss of function and causing safety accidents. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a switching valve for fire prevention and control, which is used to solve the problem that the switching valve in the prior art is not convenient for fire prevention and control.

[0004] To achieve the above object and other related objects, the present invention provides a switching valve for fire prevention and control, including: a housing, the housing includes an inlet for medium input, an outlet for medium output, and a fusible unit for changing state when heated; a spool mechanism, the spool mechanism includes a spool unit for transmitting the amount of state change of the fusible unit and a damping unit for changing the motion state of the spool unit; one end of the damping unit is connected to the housing, the other end of the damping unit is connected to the spool unit, one end of the spool unit is connected to the fusible unit, and the other end of the spool unit is respectively matched with the inlet and the outlet.

[0005] Optionally, the housing includes a first body and a second body, the first body and the second body are detachably connected, and the spool unit penetrates through the second body.

[0006] Optionally, the damping unit includes a first spring and a second spring, one end of the first spring is connected to the housing, the other end of the first spring is connected to one end of the spool unit, one end of the second spring is connected to the housing, and the other end of the second spring is connected to the other end of the spool unit.

[0007] Optionally, the spool unit includes a valve stem and a push rod, the valve stem is connected to the push rod, one end of the push rod is connected to the fusible unit, and the other end of the push rod is connected to the damping unit.

[0008] Optionally, it further includes an adjusting unit for adjusting the position of the fusible unit, the adjusting unit is matched with the position of the fusible unit, and the adjusting unit is detachably connected to the housing.

[0009] Optionally, the adjusting unit is threadedly connected to the housing.

[0010] Optionally, it further includes a sealing ring for sealing, and the sealing ring is matched with the valve core unit.

[0011] Optionally, the housing further includes a third housing, the third housing is detachably connected to the second housing, and the inlet and the outlet are provided on the third housing.

[0012] Optionally, the diameter of the valve core unit is less than or equal to the diameter of the outlet.

[0013] Optionally, one end of the valve core unit close to the fusible unit is defined as the first end, one end of the valve core unit close to the outlet is defined as the second end, the spring connected to the first end is defined as the first spring, and the spring connected to the second end is defined as the second spring. The damping coefficient of the first spring is greater than or equal to that of the second spring.

[0014] As described above, the on-off valve for fire prevention and control of the present invention has the following beneficial effects:

[0015] When a fire occurs, the physical state of the fusible unit changes due to heat, changing from solid to liquid. Furthermore, the valve core unit has a tendency to move towards the fusible unit. At the same time, the damping unit elongates, driving the valve core mechanism to move towards the direction close to the fusible unit. As a result, the inlet and the outlet are communicated, realizing the opening control of the on-off valve in a heated or fire state, avoiding situations where the valve cannot be opened due to power failure, poor reliability, etc., and improving the use reliability and safety. Description of the Drawings

[0016] Figure 1 It shows a schematic structural view of the on-off valve for fire prevention and control in an embodiment of the present invention.

[0017] Figure 2 It shows a schematic structural view of the on-off valve for fire prevention and control in an embodiment of the present invention in a fire state.

[0018] Description of Part Numbers

[0019] 11 First body

[0020] 12 Second body

[0021] 13 Third body

[0022] 14 Inlet

[0023] 15 Outlet

[0024] 16 Fusible unit

[0025] 21 Valve stem

[0026] 22 Push rod

[0027] 23 First spring

[0028] 24 Second spring

[0029] 25 Sealing ring

[0030] 3 Adjusting unit Detailed implementation manner

[0031] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0032] Please refer to Figures 1 to 2 . It should be noted that the drawings provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex. The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size should still fall within the scope covered by the technical content disclosed in the present invention without affecting the effects that the present invention can produce and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships should also be regarded as the scope within which the present invention can be implemented without substantial change in technical content.

[0033] Please refer to Figure 1 and Figure 2 , the present invention provides a switching valve for fire prevention and control, including:

[0034] A housing, the housing includes an inlet 14 for medium input, an outlet 15 for medium output, and a fusible unit 16 for changing state when heated;

[0035] The spool mechanism, which includes a spool unit for transmitting the change amount of the state of the fusible unit 16 and a damping unit for changing the motion state of the spool unit;

[0036] One end of the damping unit is connected to the housing, the other end of the damping unit is connected to the spool unit, one end of the spool unit is connected to the fusible unit 16, and the other end of the spool unit is respectively matched with the inlet 14 and the outlet 15. During use, the damping unit is compressed, and one end of the spool mechanism blocks the inlet 14 and the outlet 15. When a fire occurs, the physical state of the fusible unit 16 changes due to heat, from solid to liquid. Then, the spool unit has a tendency to move towards the fusible unit 16. At the same time, the damping unit elongates, driving the spool mechanism to move towards the direction close to the fusible unit 16. As a result, the inlet 14 and the outlet 15 are connected, realizing the opening control of the on-off valve in the case of heat or fire, avoiding the situation where the valve cannot be opened due to power failure, poor reliability, etc., and improving the use reliability and safety.

[0037] In some implementation processes, the housing includes a first body 11 and a second body 12. The first body 11 and the second body 12 are detachably connected, and the spool unit penetrates through the second body 12, which is convenient for installation and disassembly and also for maintenance.

[0038] In some implementation processes, the damping unit includes a first spring 23 and a second spring 24. One end of the first spring 23 is connected to the housing, for example, it can be connected to the second housing 12. The other end of the first spring 23 is connected to one end of the spool unit. One end of the second spring 24 is connected to the housing, for example, it can be connected to the second housing 12. The other end of the second spring 24 is connected to the other end of the spool unit. When the state of the fusible unit 16 changes, the spool unit has a tendency to move towards the direction close to the fusible unit 16. The first spring 23 elongates and drives the spool unit to move towards the fusible unit, and the second spring 24 is compressed. As a result, the spool unit moves away from the inlet 14 and the outlet 15, and the inlet 14 and the outlet 15 are connected, realizing the opening control of the on-off valve in the case of heat or fire. In some implementation processes, one end of the spool unit close to the fusible unit 16 is defined as the first end, one end of the spool unit close to the outlet 15 is defined as the second end, the spring connected to the first end is defined as the first spring 23, and the spring connected to the second end is defined as the second spring 24. The damping coefficient of the first spring 23 is greater than or equal to that of the second spring 24.

[0039] In some implementation processes, the spool unit includes a valve stem 21 and a push rod 22. The valve stem 21 is connected to the push rod 22, for example, by threaded connection. One end of the push rod 22 is connected to the fusible unit 16, and the other end of the push rod 22 is connected to the damping unit. For example, the push rod 22 and the valve stem 21 are connected by internal threads, and the push rod 22 is connected to the first spring 23. The fusible unit can be made of tin-lead alloy, and its melting point can be selected and configured between 40 and 300 degrees Celsius. When the external temperature reaches the melting point, it quickly changes from solid state to liquid state. For another example, the shape of the fusible unit includes a cylindrical shape, and its outer cylindrical surface is in circumferential contact with the housing. Its advantage is that it can quickly absorb the heat of the housing. A storage space for the molten fusible unit 16 is specifically designed between the push rod 22 and the first housing 11, and the molten fusible unit 16 will not overflow after melting. The first housing 11 is connected to the second housing 12 by threads, and an external hexagonal structure is provided at the top for convenient assembly. It can be made of aluminum alloy material, with fast heat conduction, and can quickly conduct the surrounding heat to the fusible unit 16 in a solid manner.

[0040] In order to facilitate the adjustment of the on-off control of the inlet and outlet, in some implementation processes, an adjustment unit 3 for adjusting the position of the fusible unit 16 is further included. The adjustment unit 3 is matched with the position of the fusible unit 16, and the adjustment unit 3 is detachably connected to the housing. For example, the adjustment unit 3 is threadedly connected to the housing, and the cooperation between the fusible unit and the spool unit is completed by adjusting the position of the adjustment unit 3.

[0041] In some implementation processes, a sealing ring 25 for sealing is further included. The sealing ring 25 is matched with the spool unit. For example, the sealing ring 25 cooperates with the valve stem 21 to improve the sealing performance.

[0042] In some implementation processes, the housing further includes a third housing 13. The third housing 13 is detachably connected to the second housing 12, and the inlet 14 and the outlet 15 are provided on the third housing 13. For example, the following design can be adopted for the valve stem 21 and the third housing 13: there is a gap between the valve stem 21 and the third housing 13 in the diameter direction, and mechanical contact is formed at the end conical surface to form the on-off valve action surface. The compression force of the second spring 24 forces the valve stem 21 to move downward to complete the sealing of the inlet 14 and the outlet 15 by the valve stem 21.

[0043] In some implementation processes, the diameter of the spool unit is less than or equal to the diameter of the outlet 15. For example, the diameter of the valve stem 21 is slightly less than the diameter of the outlet 15, that is, the diameter dimension A is slightly larger than the diameter dimension B. The high-pressure liquid entering the on-off valve through the inlet generates a downward thrust through the area difference between the diameter dimensions A and B, and together with the thrust of the second spring 24, forces the on-off valve to close reliably by itself. Please refer to Figure 1 .

[0044] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A switching valve for fire prevention and control, characterized in that, Comprising: A housing, the housing including an inlet for medium input, an outlet for medium output, and a fusible unit that changes state when heated; A spool mechanism, the spool mechanism including a spool unit for transmitting the amount of state change of the fusible unit and a damping unit for changing the motion state of the spool unit; One end of the damping unit is connected to the housing, the other end of the damping unit is connected to the spool unit, one end of the spool unit is connected to the fusible unit, and the other end of the spool unit is respectively matched with the inlet and the outlet; The diameter of the spool unit is less than or equal to the diameter of the outlet; The damping unit is used to drive the spool unit to move towards the fusible unit when the state of the fusible unit changes, so that the spool unit moves away from the inlet and the outlet, and the inlet and the outlet are communicated; The damping unit is further used to generate a thrust when the spool unit moves away from the inlet and the outlet, and together with the downward thrust generated by the area difference formed between the diameter of the outlet and the diameter of the spool unit when high-pressure liquid enters the inside of the on-off valve from the inlet, force the on-off valve to close reliably by itself.

2. The on-off valve for fire prevention and control according to claim 1, characterized in that, The housing includes a first body and a second body, the first body and the second body are detachably connected, and the spool unit penetrates through the second body.

3. The on-off valve for fire prevention and control according to claim 1, characterized in that The damping unit includes a first spring and a second spring, one end of the first spring is connected to the housing, the other end of the first spring is connected to one end of the spool unit, one end of the second spring is connected to the housing, and the other end of the second spring is connected to the other end of the spool unit.

4. The on-off valve for fire prevention and control according to claim 1, characterized in that The spool unit includes a valve stem and a push rod, the valve stem is connected to the push rod, one end of the push rod is connected to the fusible unit, and the other end of the push rod is connected to the damping unit.

5. The on-off valve for fire prevention and control according to claim 1, characterized in that, It further includes an adjustment unit for adjusting the position of the fusible unit, the adjustment unit is matched with the position of the fusible unit, and the adjustment unit is detachably connected to the housing.

6. The on-off valve for fire prevention and control according to claim 5, characterized in that, The adjustment unit is threadedly connected to the housing.

7. The on-off valve for fire prevention and control according to claim 2, characterized in that, It further includes a sealing ring for sealing, the sealing ring is matched with the spool unit.

8. The on-off valve for fire prevention and control according to claim 2, characterized in that, The housing further includes a third body, the third body is detachably connected to the second body, and the inlet and the outlet are provided on the third body.

9. The on-off valve for fire prevention and control according to claim 3, characterized in that, Define one end of the spool unit close to the fusible unit as the first end, define one end of the spool unit close to the outlet as the second end, define the spring connected to the first end as the first spring, and define the spring connected to the second end as the second spring, and the damping coefficient of the first spring is greater than or equal to that of the second spring.

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