A burst pipe safety valve

Abstract

The application provides a burst pipe safety valve, which comprises a main valve, a pressure measuring pipe and a pilot valve assembly. The main valve comprises a flow valve cavity and a main control cavity, and a main valve core. The flow valve cavity is provided with an inlet and an outlet. The main valve core is arranged in the main control cavity and extends into the flow valve cavity. The main valve core has a stop position for closing the flow valve cavity and a flow position for opening the flow valve cavity under the action of the main control cavity. The pressure measuring pipe is in communication with the outlet. The pilot valve assembly comprises a second pilot valve and a first pilot valve. The second pilot valve is connected with the inlet, the outlet, the main control cavity and the pressure measuring pipe. The second pilot valve is adapted to adjust the internal pressure of the main control cavity under the interaction of the internal pressures of the pressure measuring pipe, the inlet and the outlet. The first pilot valve is connected with the inlet, the outlet and the main control cavity. The first pilot valve is adapted to adjust the internal pressure of the main control cavity under the interaction of the internal pressures of the inlet and the outlet, and cooperates with the second pilot valve. A proportional adjusting structure is connected with the first pilot valve and the second pilot valve. The proportional adjusting structure is adapted to adjust the pressure regulating proportion of the first pilot valve and the second pilot valve to the main control cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve structure, and particularly relates to a burst pipe safety valve. BACKGROUND

[0002] The burst pipe safety valve is a device capable of quickly detecting and cutting off fluid delivery after a pressurized pipeline bursts, and is suitable for various water supply pipelines such as urban water supply projects and industrial water supply projects. The burst pipe safety valve controlled by water force does not need electrical control, and can rely on the pressure characteristics and flow rate characteristics of the pipelines before and after the valve as double judgment conditions, and uses the pressure of the pipeline itself to realize valve action, and is suitable for fluid control occasions with large burst pipe influence, fast and accurate closing requirement and high automation degree.

[0003] A prior art pilot pressure differential burst pipe cut-off valve includes a main valve, a pilot valve, a pressure measuring pipe and a plurality of control pipelines, the pressure measuring pipe is connected with the downstream side of the valve seat of the main valve, one end of the control pipeline one, the control pipeline two and the control pipeline three is connected with the upstream side of the valve seat, the pressure measuring pipe and the main valve upper cavity of the main valve piston respectively, and the other end is communicated with the lower communication node, the lower cavity of the pilot valve and the upper communication node respectively, the control pipeline one is also communicated with the space composed of the pilot valve shaft, the pilot valve upper end cover and the pilot valve piston, the main valve spring is located in the main valve lower cavity and is always in a pre-tightening state under pressure, in a normal state, the valve is in a fully open state, and in a burst pipe state, the valve is closed.

[0004] However, the above setting takes the pipeline flow rate as the judgment standard for valve action, and it is difficult to effectively reflect the internal pressure value of the pipeline, and it is impossible to comprehensively determine whether to close the valve according to the pipeline flow rate and the internal pressure value of the pipeline, and the use precision is poor. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defects in the prior art that only take the pipeline flow rate as the judgment standard for valve action, it is difficult to effectively reflect the internal pressure value of the pipeline, it is impossible to comprehensively determine whether to close the valve according to the pipeline flow rate and the internal pressure value of the pipeline, and the use precision is poor, so as to provide a burst pipe safety valve.

[0006] The application provides a burst pipe safety valve, which comprises a main valve, a pressure measuring pipe and a pilot valve assembly.

[0007] The flow cross-section diameter of the pressure measuring pipe is smaller than that of the flow valve cavity.

[0008] The first pilot valve and the second pilot valve are integrally arranged, and the proportional adjustment structure is arranged on the pilot valve assembly.

[0009] The main control cavity comprises a control upper cavity connected with the first pilot valve, a main control lower cavity connected with the second pilot valve, a main elastic member arranged on the main valve core and adapted to drive the main valve core to stay in the flow-through position, and a main piston member arranged between the main control upper cavity and the main control lower cavity and connected with the main valve core, and adapted to separate the main control upper cavity and the main control lower cavity and drive the main valve core to move or stop between the flow-through position and the stop position under the interaction of the pressure difference and the main elastic member.

[0010] The flow valve cavity comprises a flow guide part arranged between the water inlet end and the water outlet end and arranged in a curved manner, and at least part of the flow guide part is arranged in the same direction as the main valve core; a sealing inner protrusion is arranged on the inner wall of the flow guide part in a circumferential direction, and one end of the main valve core extending into the flow valve cavity is provided with a sealing valve disc; in the stop position, the sealing valve disc and the sealing inner protrusion on the side facing the main control cavity are sealingly abutted, and the flow valve cavity is closed.

[0011] The second pilot valve comprises a second switching cavity connected with the water outlet end and the main control lower cavity respectively, and adapted to communicate with an external space; a second control cavity connected with the water inlet end and the pressure measuring pipe respectively; a second valve core member arranged in the second switching cavity and extending into the second control cavity, connected with the proportional adjusting structure, adapted to move under the pressure difference between the second control cavity and the second switching cavity and the action of the proportional adjusting structure, and adapted to adjust the internal pressure of the main control lower cavity.

[0012] The second control cavity comprises a second control upper cavity connected with the water inlet end; a second control lower cavity arranged separately from the second control upper cavity and communicating with the pressure measuring pipe; and a second control piston member arranged between the second control upper cavity and the second control lower cavity, connected with the second valve core member, adapted to separate the second control upper cavity and the second control lower cavity, and adjust the internal pressure of the main control lower cavity under the pressure difference between the second control upper cavity, the second control lower cavity and the second switching cavity and the action of the proportional adjusting structure.

[0013] The second switching cavity comprises a second switching upper cavity adapted to communicate with an external space; a second switching middle cavity adjacent to the second switching upper cavity and communicating with the main control lower cavity; a second switching lower cavity arranged on the side of the second switching middle cavity away from the second switching upper cavity and communicating with the water outlet end; and a second switching piston member arranged between the second switching upper cavity and the second switching lower cavity, connected with the second valve core member, having a first working position of blocking the second switching lower cavity and communicating the second switching upper cavity and the second switching middle cavity, and a second working position of blocking the second switching upper cavity and communicating the second switching middle cavity and the second switching lower cavity.

[0014] The first pilot valve comprises a first switching cavity connected with the water outlet end and the main control upper cavity respectively, and adapted to communicate with an external space; a first control cavity connected with the water outlet end and adapted to communicate with an external space; and a first valve core member arranged in the first switching cavity and extending into the first control cavity, connected with the proportional adjusting structure, adapted to adjust the internal pressure of the main control upper cavity under the pressure difference between the first control cavity and the first switching cavity and the action of the proportional adjusting structure.

[0015] The first control cavity comprises: a first control upper cavity in communication with the water outlet end; a first control lower cavity arranged in a spaced manner with the second control upper cavity and adapted to be in communication with the outside; and a first control piston arranged between the first control upper cavity and the first control lower cavity and connected with the first valve core, adapted to separate the first control upper cavity and the first control lower cavity and to adjust the internal pressure of the main control upper cavity under the pressure difference between the first control upper cavity, the first control lower cavity and the first switch cavity and the action of the proportional adjustment structure.

[0016] The first switch cavity comprises: a first switch upper cavity in communication with the water inlet end; a first switch middle cavity arranged adjacent to the first switch upper cavity and in communication with the main control upper cavity; a first switch lower cavity arranged on the side of the first switch middle cavity away from the first switch upper cavity and connected with the water inlet end; and a first switch piston arranged between the first switch upper cavity and the first switch lower cavity and connected with the first valve core, having a third working position of blocking the first switch lower cavity and connecting the first switch upper cavity and the first switch middle cavity and a fourth working position of blocking the first switch upper cavity and connecting the first switch middle cavity and the first switch lower cavity.

[0017] The proportional adjustment structure comprises: a base arranged on the pilot valve assembly and arranged on the same side of the first switch upper cavity and the second switch upper cavity; a guide arranged on the pilot valve assembly and arranged between the first switch upper cavity and the second switch upper cavity, the base being adapted to move along the guide; and a lever main body connected with the base, the first valve core penetrating out of the first switch upper cavity, the second valve core penetrating out of the second switch upper cavity, and the lever main body being hingedly connected with the end of the first valve core and the end of the second valve core, respectively.

[0018] The technical scheme of the present application has the following advantages:

[0019] The main control cavity is arranged to drive the main valve core to move and further control the on-off of the over-flow valve cavity from the water inlet end to the water outlet end, and the first pilot valve and the second pilot valve and the proportional adjustment structure are arranged, wherein the first pilot valve and the second pilot valve constitute a pilot valve assembly and are arranged on the water paths of the main control cavity, the water inlet end and the water outlet end, respectively, the first pilot valve can at least adjust the internal pressure of the main control cavity through the pressure measuring pipe, the flow rate and the pressure difference between the water inlet end and the water outlet end, the second pilot valve can at least further adjust the internal pressure of the main control cavity through the flow rate and the pressure difference between the water outlet end and the water inlet end, and the multi-stage adjustment of the internal pressure of the main control cavity can be realized by such arrangement.

[0020] At the same time, it can be known from formula derivation that the pressure difference between the water inlet end, the water outlet end and the pressure measuring pipe can reflect the flow rate or flow value of the flow valve cavity, and by setting the proportional adjusting structure, the first guide valve and the second guide valve are adjusted, so that the main control cavity is controlled according to the pressure difference between the water inlet end, the water outlet end and the pressure measuring pipe, and the flow rate or flow value through the flow valve cavity is adjusted, thereby proportional control of the flow rate or flow value before and after the pipe of the burst safety valve can be realized, and the need of the user to determine whether to close the valve according to the proportion between the pipe flow rate and the pipe internal pressure value can be met, and the use precision of the burst safety valve is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative labor based on these drawings also belong to the protection scope of the present application.

[0022] Figure 1 The structure diagram of the burst safety valve provided in the embodiments of the present application is shown in the figure.

[0023] Explanation of reference signs:

[0024] 1, flow valve cavity; 11, water outlet end; 12, water inlet end; 13, flow guide part; 14, sealing inner protrusion; 2, main control cavity; 21, main control upper cavity; 22, main control lower cavity; 23, main elastic member; 24, main piston member; 3, main valve core member; 31, sealing valve disc; 4, pressure measuring pipe; 5, first guide valve; 51, first switch cavity; 511, first switch upper cavity; 512, first switch middle cavity; 513, first switch lower cavity; 514, first switch piston member; 52, first control cavity; 521, first control upper cavity; 522, first control lower cavity; 523, first control piston member; 53, first valve core member; 6, second guide valve; 61, second switch cavity; 611, second switch upper cavity; 612, second switch middle cavity; 613, second switch lower cavity; 614, second switch piston member; 62, second control cavity; 621, second control upper cavity; 622, second control lower cavity; 623, second control piston member; 63, second valve core member; 7, proportional adjusting structure; 71, base; 72, lever body. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be described below in conjunction with the drawings, obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor also belong to the protection scope of the present application.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0029] As shown in Figure 1 The present embodiment provides a burst safety valve, which comprises a main valve, a pressure measuring pipe 4 and a pilot valve assembly.

[0030] The main valve comprises a flow valve cavity 1 and a main control cavity 2, and a main valve core 3, wherein the flow valve cavity 1 is provided with a water inlet end 12 and a water outlet end 11 in the form of a pipe end on both sides, respectively, and the main control cavity 2 is provided separately from the flow valve cavity 1, and in the present embodiment, the main control cavity 2 is provided on the upper side of the flow valve cavity 1. Further, the main body structure of the main valve core 3 is in the form of a straight rod, the main valve core 3 is arranged in the main control cavity 2, a part of which extends into the flow valve cavity 1, and has a stop position for closing the flow valve cavity 1 under the action of the main control cavity 2, and a flow-through position for opening the flow valve cavity 1;

[0031] In the present embodiment, the pressure measuring pipe 4 is provided in the form of a straight pipe, one end of which communicates with the water outlet end 11. In the present embodiment, the flow cross-sectional diameter of the pressure measuring pipe 4 is smaller than the flow cross-sectional diameter of the flow valve cavity 1, and in the present embodiment, the flow cross-sectional size of the flow valve cavity 1 is uniformly arranged from the water inlet end 12 and the water outlet end 11, and as a variable embodiment, the flow rate of the pressure measuring pipe 4 can be less than or equal to the flow rate of the water flow in the flow valve cavity 1. As another variable embodiment, the flow cross-sectional size of the flow valve cavity can be non-uniformly arranged from the water inlet end 12 and the water outlet end 11, and the average flow cross-sectional diameter corresponding thereto is greater than the flow cross-sectional diameter of the pressure measuring pipe 4.

[0032] The pilot valve assembly comprises a first pilot valve 5, a second pilot valve 6 and a proportional adjusting structure 7.

[0033] The second pilot valve 6 is connected with the water inlet end 12, the water outlet end 11, the main control cavity 2 and the pressure measuring pipe 4 respectively, and is adapted to adjust the internal pressure of the main control cavity 2 under the interaction of the internal pressures of the pressure measuring pipe 4, the water inlet end 12 and the water outlet end 11. The first pilot valve 5 is connected with the water inlet end 12, the water outlet end 11 and the main control cavity 2, and is adapted to adjust the internal pressure of the main control cavity 2 under the interaction of the internal pressures of the water inlet end 12 and the water outlet end 11 in cooperation with the second pilot valve 6. In the embodiment, the second pilot valve 6 and the first pilot valve 5 are further respectively connected with the outside, and the internal pressure of the main control cavity 2 is further adjusted by the pressure difference with the outside.

[0034] The proportional adjusting structure 7 is connected with the first pilot valve 5 and the second pilot valve 6 respectively, and can adjust the pressure regulating proportion of the first pilot valve 5 and the second pilot valve 6 to the main control cavity 2. In the embodiment, the proportional adjusting structure 7 is in the form of a lever structure, and is connected with the valve cores in the first pilot valve 5 and the second pilot valve 6 respectively. Thus, the structure is simple and convenient for adjustment.

[0035] The main control cavity 2 is arranged to drive the main valve core 3 to move, and further control the on-off of the water flow through the water inlet end 12 to the water outlet end 11 of the overflow valve cavity 1. Meanwhile, the first pilot valve 5 and the second pilot valve 6 and the proportional adjusting structure 7 are arranged. The first pilot valve 5 and the second pilot valve 6 constitute a pilot valve assembly, and are arranged on the water paths of the main control cavity 2, the water inlet end 12 and the water outlet end 11 respectively. The first pilot valve 5 can at least adjust the internal pressure of the main control cavity 2 by the flow rate and the pressure difference of the pressure measuring pipe 4, the water outlet end 11 and the water inlet end 12. The second pilot valve 6 can at least further adjust the internal pressure of the main control cavity 2 by the flow rate and the pressure difference of the water outlet end 11 and the water inlet end 12. Thus, the multi-stage adjustment of the internal pressure of the main control cavity 2 can be realized.

[0036] The flow rate of the water through the water inlet end 12 and the water outlet end 11 of the overflow valve cavity 1 is Q. The flow rates of the overflow valve cavity 1 and the pressure measuring pipe 4 are equal. The diameter of the overflow valve cavity 1 is D1, the diameter of the pressure measuring pipe 4 is D2, the flow rate of the water in the overflow valve cavity 1 is v1, the flow rate of the water in the pressure measuring pipe 4 is v2, and k is the proportional coefficient of the diameter D1 of the overflow valve cavity 1 and the diameter D2 of the pressure measuring pipe 4. Specifically,

[0037]

[0038] Further,

[0039] According to Bernoulli's principle, when the water flows, where g is the acceleration of gravity, p is the density of water, P1 is the internal pressure of the overflow valve cavity 1, and P2 is the internal pressure of the pressure measuring pipe 4.

[0040] The above formula is associated with

[0041] From the above, the pressure difference between the over-flow valve cavity 1 and the pressure tube is proportional to the square of the flow rate v1 of the over-flow valve cavity 1, and further proportional to the flow Q of the over-flow valve cavity 1.

[0042] Further, when the water flowing through the over-flow valve cavity 1 is at a certain flow rate, the diameter of the over-flow valve cavity 1 is greater than the diameter of the pressure tube 4, so the above formula, the flow rate in the over-flow valve cavity 1 is less than the flow rate in the pressure tube 4. According to Bernoulli's principle, the water pressure in the over-flow valve cavity 1 is less than the water pressure in the pressure tube 4. Further, the pressure difference between the inlet end 12, the outlet end 11 and the pressure tube 4 can reflect the value of the flow rate or flow of the water flowing through the over-flow valve cavity 1.

[0043] In the embodiment, the first pilot valve 5 and the second pilot valve 6 are integrally arranged, and the proportional adjustment structure 7 is connected to the pilot valve assembly. In this way, the proportional adjustment structure 7 can be easily assembled and arranged, and the first pilot valve 5 and the second pilot valve 6 can be adjusted at the same time, and the structure is simple and easy to realize.

[0044] As a convertible embodiment, the first pilot valve 5 and the second pilot valve 6 can be separately arranged, and the proportional adjustment structure 7 is connected to the first pilot valve 5 and the second pilot valve 6.

[0045] The main control cavity 2 includes a main control upper cavity 21, a main control lower cavity 22, a main elastic member 23 and a main piston member 24.

[0046] The main control cavity 2 is divided into a main control upper cavity 21 and a main control lower cavity 22 by the main piston member 24. In the embodiment, the main piston member 24 completely separates the main control upper cavity 21 and the main control lower cavity 22, and the two are arranged apart from each other. The main control upper cavity 21 is connected to the first pilot valve 5, the main control lower cavity 22 is connected to the second pilot valve 6, and the proportional adjustment structure 7 can adjust the pressure adjustment ratio of the main control upper cavity 21 and the main control lower cavity 22 corresponding to the first pilot valve 5 and the second pilot valve 6.

[0047] The main elastic member 23 is a spring member, and can also be other elastic structures. The main elastic member 23 is sleeved on the main valve core member 3. In the embodiment, when the burst safety valve is working, the main elastic member 23 applies an elastic force to the main piston member 24 towards the main control upper cavity 21, which can drive the main valve core member 3 to stay in the flow-through position. The main piston member 24 is arranged between the main control upper cavity 21 and the main control lower cavity 22, and is connected to the main valve core member 3. It can separate the main control upper cavity 21 and the main control lower cavity 22, and under the interaction of the pressure difference and the main elastic member 23, it can drive the main valve core member 3 to move or stop between the flow-through position and the stop position.

[0048] Further, the overflow valve cavity 1 comprises a flow guide part 13 and a sealing inner protrusion 14.

[0049] The flow guide part 13 is curved and arranged between the water inlet end 12 and the water outlet end 11. At least part of the flow guide part 13 is arranged in the same direction as the main valve core member 3, so that the sealing inner protrusion 14 is sealed by the extension and retraction of the main valve core member 3, thereby controlling the opening and closing of the overflow valve cavity 1.

[0050] The sealing inner protrusion 14 protrudes from the inner wall of the flow guide part 13 in the circumferential direction. The main valve core member 3 extends to one end of the overflow valve cavity 1 and is provided with a sealing valve disc 31. The inner diameter of the sealing inner protrusion 14 is smaller than the outer diameter of the sealing valve disc 31. In the stop position, the sealing valve disc 31 is sealed and abuts the side of the sealing inner protrusion 14 facing the main control cavity 2, thereby sealing the overflow valve cavity 1.

[0051] The second guide valve 6 comprises a second switch cavity 61, a second control cavity 62 and a second valve core member 63.

[0052] The second switch cavity 61 is connected to the water outlet end 11, the main control lower cavity 22 and the external space, respectively. The second control cavity 62 is arranged below the second switch cavity 61 and is connected to the water inlet end 12 and the pressure measuring tube 4, respectively. The second valve core member 63 is arranged in the second switch cavity 61 and extends into the second control cavity 62. The top end of the second valve core member 63 protrudes out of the second switch cavity 61 and is connected to the proportional adjustment structure 7. The second valve core member 63 can move under the pressure difference between the second control cavity 62 and the second switch cavity 61 and the action of the proportional adjustment structure 7, thereby adjusting the internal pressure of the main control lower cavity 22.

[0053] The second control cavity 62 comprises a second control upper cavity 621, a second control lower cavity 622 and a second control piston member 623.

[0054] The second control upper cavity 621 is connected to the water inlet end 12, and the second control lower cavity 622 is connected to the pressure measuring tube 4 and is arranged separately from the second control upper cavity 621. The second control piston member 623 is arranged between the second control upper cavity 621 and the second control lower cavity 622 and is connected to the second valve core member 63. The second control piston member 623 separates the second control upper cavity 621 and the second control lower cavity 622 and adjusts the internal pressure of the main control lower cavity 22 under the pressure difference between the second control upper cavity 621, the second control lower cavity 622 and the second switch cavity 61 and the action of the proportional adjustment structure 7.

[0055] In this embodiment, the second switch cavity 61 comprises a second switch upper cavity 611, a second switch middle cavity 612, a second switch lower cavity 613 and a second switch piston member 614.

[0056] In the embodiment, the second switch upper cavity 611, the second switch middle cavity 612 and the second switch lower cavity 613 are arranged in sequence, wherein the second switch upper cavity 611 is provided with an opening and can communicate with the external space, the second switch middle cavity 612 is arranged in communication with the main control lower cavity 22, and the second switch lower cavity 613 is arranged on the side of the second switch middle cavity 612 away from the second switch upper cavity 611 and in communication with the water outlet end 11; the second switch piston 614 is arranged between the second switch upper cavity 611 and the second switch lower cavity 613 and is arranged in connection with the second valve core 63, has a first working position of blocking the second switch lower cavity 613 and communicating the second switch upper cavity 611 and the second switch middle cavity 612, and a second working position of blocking the second switch upper cavity 611 and communicating the second switch middle cavity 612 and the second switch lower cavity 613.

[0057] The first pilot valve 5 comprises a first switch cavity 51, a first control cavity 52 and a first valve core 53.

[0058] The first switch cavity 51 is connected with the water outlet end 11, the main control upper cavity 21 and the external space respectively, the first control cavity 52 is arranged on the lower side of the first switch cavity 51 and is arranged in communication with the water outlet end 11 and the external space respectively, the first valve core 53 is in the shape of a straight rod, is arranged in the first switch cavity 51 and extends into the first control cavity 52, and the top end is arranged in connection with the proportional adjustment structure 7 and can adjust the internal pressure of the main control upper cavity 21 under the action of the pressure difference between the first control cavity 52 and the first switch cavity 51 and the proportional adjustment structure 7.

[0059] Specifically, the first control cavity 52 comprises a first control upper cavity 521, a first control lower cavity 522 and a first control piston 523.

[0060] The first control upper cavity 521 is in communication with the water outlet end 11, the first control lower cavity 522 is arranged in separation from the second control upper cavity 621 and is provided with an opening on it and arranged in communication with the external space, and the first control piston 523 is arranged between the first control upper cavity 521 and the first control lower cavity 522, is arranged in connection with the first valve core 53 in the circumferential direction, can separate the first control upper cavity 521 and the first control lower cavity 522, and can adjust the internal pressure of the main control upper cavity 21 under the action of the pressure difference between the first control upper cavity 521, the first control lower cavity 522 and the first switch cavity 51 and the proportional adjustment structure 7.

[0061] Further, the first switch cavity 51 comprises a first switch upper cavity 511, a first switch middle cavity 512, a first switch lower cavity 513 and a first switch piston 514.

[0062] The first switch upper cavity 511, the first switch middle cavity 512 and the first switch lower cavity 513 are sequentially arranged, the first switch upper cavity 511 at the top is in communication with the water inlet end 12, the first switch middle cavity 512 adjacent to the first switch upper cavity 511 is in communication with the main control upper cavity 21, and the first switch lower cavity 513 is arranged on the side of the first switch middle cavity 512 away from the first switch upper cavity 511 and is connected with the water inlet end 12.

[0063] The first switch piston 514 is arranged between the first switch upper cavity 511 and the first switch lower cavity 513, is connected with the first valve core 53, has a third working position of blocking the first switch lower cavity 513, connecting the first switch upper cavity 511 and the first switch middle cavity 512, and a fourth working position of blocking the first switch upper cavity 511, connecting the first switch middle cavity 512 and the first switch lower cavity 513.

[0064] The arrangement of the three cavities on the first switch cavity 51 and the second switch cavity 61 can realize the communication mode of different cavities through the extension and contraction of a single valve core, is simple in structure and easy to implement, and reduces the control difficulty.

[0065] In the embodiment, the first valve core 53 and the second valve core 63 are arranged in the same type, wherein the downward water pressure borne by the first valve core 53 is F1: F1=A·P1;

[0066] Further, the downward water pressure borne by the second valve core 63 is F2: Wherein A is the pressure-bearing effective area of the first valve core 53 and the second valve core 63.

[0067] The distance between the axis of the first valve core 53 and the base 71 is L1, the distance between the axis of the second valve core 63 and the base 71 is L2, and the lever ratio value l is set, According to the lever principle, F1 and F2 are balanced, and there is:

[0068] Further, from the above formula, it can be known that

[0069] From the above formula, it can be seen that the pressure P1 in the overflow valve cavity 1 and the flow rate v1 of the overflow valve cavity 1 determine whether the burst safety valve acts or not; the adjustment lever ratio value l can adjust the proportional relationship between the pressure P1 of the overflow valve cavity 1 and the flow rate v1 of the overflow valve cavity.

[0070] In summary, according to the formula derivation, the pressure difference between the water inlet end 12, the water outlet end 11 and the pressure pipe 4 can reflect the flow rate or flow value of the flow valve cavity 1. By setting the proportional adjusting structure 7, the first pilot valve 5 and the second pilot valve 6 are adjusted, so that the main control cavity 2 is controlled according to the pressure difference between the water inlet end 12, the water outlet end 11 and the pressure pipe 4, and the flow rate or flow value through the flow valve cavity 1 is adjusted, so that proportional control of the flow rate or flow value before and after the pipe of the burst safety valve can be realized, and the needs of the user to determine whether to close the valve according to the proportion of the pipe flow rate and the internal pressure value of the pipe can be met, and the use precision of the burst safety valve can be effectively improved.

[0071] Specifically, the proportional adjusting structure 7 includes a base 71 and a lever body 72.

[0072] The base 71 is rod-shaped and protrudes on the pilot valve assembly and is arranged on the same side as the first switch upper cavity 511 and the second switch upper cavity 611. The guide member is specifically a sliding rail or a guide rail and is arranged on the pilot valve assembly and between the first switch upper cavity 511 and the second switch upper cavity 611 in the length direction. The base 71 is limited and movably connected with the guide member, and the base 71 can move along the guide member under the action of an external force.

[0073] The lever body 72 is rod-shaped, and the middle part of the lever body 72 is connected with the base 71 and can be riveted, etc. In this embodiment, the first valve core member 53 penetrates out of the first switch upper cavity 511, the second valve core member 63 penetrates out of the second switch upper cavity 611, and the lever body 72 is hingedly connected with the end part of the first valve core member 53 and the end part of the second valve core member 63. In this embodiment, the end part of the lever body 72 is further provided with a handle, which is convenient for the user to manually control.

[0074] The proportional adjusting structure 7 is arranged in the form of a lever, and the proportional relationship required can be formed according to the distance between the proportional adjusting structure 7 and the first valve core member 53 and the second valve core member 63, so that the first pilot valve 5 and the second pilot valve 6 can adjust the pressure difference between the main control upper cavity 21 and the main control lower cavity 22 under the condition that there is a specific ratio of the internal pressure between the water inlet end 12, the water outlet end 11 and the pressure pipe 4 or a specific ratio of the corresponding flow rate, so that the main valve core member 3 closes the flow valve cavity 1. In this way, the reaction is fast, the precision is high, and automatic control can be realized under the premise of no electrical control.

[0075] Working process:

[0076] The burst safety valve is divided into a normal opening state and an emergency closing state.

[0077] I. When the valve is normally opened, the water pressure in front and back of the overflow valve chamber 1 is at a certain stable value. The fluid in front and back of the pipe of the burst safety valve has stable pressure and stable flow rate. At this time, the force received by the first control piston piece 523 is proportional to the water pressure in the overflow valve chamber 1, and the force received by the second control piston piece 623 is proportional to the overflow flow rate in the overflow valve chamber 1. Since the flow rate is small at this time, under the action of the proportional adjusting structure 7, the force received by the first control piston piece 523 is greater than the force received by the second control piston piece 623, the first control piston piece 523 goes down, drives the first valve core piece 53 to go down, and then the main control upper chamber 21 is connected with the external space. At the same time, the second control piston piece 623 goes up, drives the second valve core piece 63 to go up, controls the communication between the second switch middle chamber 612 and the second switch lower chamber 613, and then the main control lower chamber 22 is connected with the water outlet end 11, so that the pressure in the main control chamber 2 is greater than the upper pressure, and the overflow valve chamber 1 is kept in the opened state.

[0078] II. When the pipe downstream of the valve bursts, the water pressure of the water inlet end 12 and the water outlet end 11 rapidly decreases, and the water flow rate through the overflow valve chamber 1 and the pressure measuring pipe 4 rapidly increases. Since the force received by the first control piston piece 523 is proportional to the water pressure in the overflow valve chamber 1, and the force received by the second control piston piece 623 is proportional to the water flow rate in the overflow valve chamber 1.

[0079] At this time, the pressure of the water inlet end 12 decreases, and under the action of the lever, the force received by the second control piston piece 623 is greater than the force received by the first control piston piece 523 of the pilot valve, the first control piston piece 523 of the pilot valve goes up, drives the first valve core piece 53 to go up, and controls the communication between the main control upper chamber 21 and the water inlet end 12. At the same time, the second control piston piece 623 goes down, drives the second valve core piece 63 to go down, so that the main control lower chamber 22 is connected with the external environment, and then the upper pressure in the main control chamber 2 is greater than the lower pressure, the main valve core piece 3 goes down, and the main valve gradually closes.

[0080] Obviously, the above embodiments are only examples for clearly illustrating, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A burst disc safety valve characterized by, The utility model relates to a kind of proportional pressure regulating valve, including: Main valve, including overflow valve cavity (1) and main control cavity (2) and main valve core piece (3), the overflow valve cavity (1) is provided with water inlet end (12) and water outlet end (11), the main valve core piece (3) is located in the main control cavity (2), and extends into the overflow valve cavity (1), with the stop position of the main control cavity (2) under the action of the overflow valve cavity (1) is closed, and the flow-through position of the overflow valve cavity (1) is opened; Pressure measuring tube (4) is arranged in communication with the water outlet end (11), and the flow-through cross-sectional diameter of the pressure measuring tube (4) is smaller than the flow-through cross-sectional diameter of the overflow valve cavity (1); Pilot valve assembly, including: Second pilot valve (6) is connected with the water inlet end (12), the water outlet end (11), the main control cavity (2) and the pressure measuring tube (4) respectively, and is suitable for adjusting the internal pressure of the main control cavity (2) under the interaction of the internal pressure of the pressure measuring tube (4), the water inlet end (12) and the water outlet end (11); First pilot valve (5) is connected with the water inlet end (12), the water outlet end (11) and the main control cavity (2), and is suitable for adjusting the internal pressure of the main control cavity (2) in cooperation with the second pilot valve (6) under the interaction of the internal pressure of the water inlet end (12) and the water outlet end (11), and the first pilot valve (5) and the second pilot valve (6) are communicated with the outside world respectively; Proportional adjusting structure (7) is arranged in connection with the first pilot valve (5) and the second pilot valve (6) respectively, and is suitable for adjusting the pressure regulating proportion of the first pilot valve (5) and the second pilot valve (6) to the main control cavity (2), the first pilot valve (5) and the second pilot valve (6) are integrally arranged, and the proportional adjusting structure (7) is arranged in connection on the pilot valve assembly; Wherein, the main control cavity (2) includes main control upper cavity (21) and main control lower cavity (22), the main control upper cavity (21) is connected with the first pilot valve (5), and the main control lower cavity (22) is arranged in connection with the second pilot valve (6); The first pilot valve (5) includes first switch cavity (51), first control cavity (52) and first valve core piece (53), the first switch cavity (51) is connected with the water outlet end (11) and the main control upper cavity (21) respectively, the first switch cavity (51) is suitable for communicating with external space, the first switch cavity (51) includes first switch upper cavity (511), which is communicated with the water inlet end (12), the first control cavity (52) is arranged in connection with the water outlet end (11), and is suitable for communicating with external space, the first control cavity (52) includes first control upper cavity (521), which is communicated with the water outlet end (11), the first valve core piece (53) is arranged in the first switch cavity (51), and extends into the first control cavity (52), and is arranged in connection with the proportional adjusting structure (7), and is suitable for adjusting the internal pressure of the main control upper cavity (21) under the action of the pressure difference of the first control cavity (52) and the first switch cavity (51) and the proportional adjusting structure (7); The utility model relates to a kind of proportional pressure regulating valve, including: Main valve, including overflow valve cavity (1) and main control cavity (2) and main valve core piece (3), the overflow valve cavity (1) is provided with water inlet end (12) and water outlet end (11), the main valve core piece (3) is located in the main control cavity (2), and extends into the overflow valve cavity (1), with the stop position of the main control cavity (2) under the action of the overflow valve cavity (1) is closed, and the flow-through position of the overflow valve cavity (1) is opened; Pressure measuring tube (4) is arranged in communication with the water outlet end (11), and the flow-through cross-sectional diameter of the pressure measuring tube (4) is smaller than the flow-through cross-sectional diameter of the overflow valve cavity (1); Pilot valve assembly, including: Second pilot valve (6) is connected with the water inlet end (12), the water outlet end (11), the main control cavity (2) and the pressure measuring tube (4) respectively, and is suitable for adjusting the internal pressure of the main control cavity (2) under the interaction of the internal pressure of the pressure measuring tube (4), the water inlet end (12) and the water outlet end (11); First pilot valve (5) is connected with the water inlet end (12), the water outlet end (11) and the main control cavity (2), and is suitable for adjusting the internal pressure of the main control cavity (2) in cooperation with the second pilot valve (6) under the interaction of the internal pressure of the water inlet end (12) and the water outlet end (11), and the first pilot valve (5) and the second pilot valve (6) are communicated with the outside world respectively; Proportional adjusting structure (7) is arranged in connection with the first pilot valve (5) and the second pilot valve (6) respectively, and is suitable for adjusting the pressure regulating proportion of the first pilot valve (5) and the second pilot valve (6) to the main control cavity (2), the first pilot valve (5) and the second pilot valve (6) are integrally arranged, and the proportional adjusting structure (7) is arranged in connection on the pilot valve assembly; Wherein, the main control cavity (2) includes main control upper cavity (21) and main control lower cavity (22), the main control upper cavity (21) is connected with the first pilot valve (5), and the main control lower cavity (22) is arranged in connection with the second pilot valve (6); The first pilot valve (5) includes first switch cavity (51), first control cavity (52) and first valve core piece (53), the first switch cavity (51) is connected with the water outlet end (11) and the main control upper cavity (21) respectively, the first switch cavity (51) is suitable for communicating with external space, the first switch cavity (51) includes first switch upper cavity (511), which is communicated with the water inlet end (12), the first control cavity (52) is arranged in connection with the water outlet end (11), and is suitable for communicating with external space, the first control cavity (52) includes first control upper cavity (521), which is communicated with the water outlet end (11), the first valve core piece (53) is arranged in the first switch cavity (51), and extends into the first control cavity (52), and is arranged in connection with the proportional adjusting structure (7), and is suitable for adjusting the internal pressure of the main control upper cavity (21) under the action of the pressure difference of the first control cavity (52) and the first switch cavity (51) and the proportional adjusting structure (7) The second pilot valve (6) comprises a second switching cavity (61) and a second control cavity (62), the second switching cavity (61) is connected with the water outlet end (11) and the main control lower cavity (22) respectively, and the second switching cavity (61) is also adapted to communicate with an external space, the second switching cavity (61) comprises a second switching upper cavity (611) adapted to communicate with the external space, and the second control cavity (62) is connected with the water inlet end (12) and the pressure measuring pipe (4) respectively, and the second control cavity (62) comprises a second control upper cavity (621) connected with the water inlet end (12); The proportional adjusting structure (7) comprises: a base (71) disposed on the pilot valve assembly and disposed on the same side of the first switching upper cavity (511) and the second switching upper cavity (611); a guide disposed on the pilot valve assembly and disposed between the first switching upper cavity (511) and the second switching upper cavity (611), and the base (71) is adapted to move along the guide; a lever main body (72) connected with the base (71), the first valve core member (53) penetrates through the first switching upper cavity (511), the second valve core member (63) penetrates through the second switching upper cavity (611), and the lever main body (72) is hingedly connected with the end of the first valve core member (53) and the end of the second valve core member (63) respectively.

2. The burst disc safety valve of claim 1, wherein The main control cavity (2) further comprises: a main elastic member (23) disposed on the main valve core member (3) and adapted to drive the main valve core member (3) to stay in the flow-through position; a main piston member (24) disposed between the main control upper cavity (21) and the main control lower cavity (22), connected with the main valve core member (3), adapted to separate the main control upper cavity (21) and the main control lower cavity (22), and under the interaction of the pressure difference between the main control upper cavity (21) and the main control lower cavity (22) and the main elastic member (23), drive the main valve core member (3) to move or stop between the flow-through position and the stop position.

3. The burst disc safety valve of claim 2, wherein, The overflow valve cavity (1) comprises: a flow guide part (13) disposed between the water inlet end (12) and the water outlet end (11) and arranged in a curved manner, at least part of the extension direction of the flow guide part (13) is arranged in the same direction as the extension direction of the main valve core member (3); a sealing inner protrusion (14) protruding from the inner wall of the flow guide part (13) in the circumferential direction, one end of the main valve core member (3) extending into the overflow valve cavity (1) is provided with a sealing valve disc (31), in the stop position, the sealing valve disc (31) is sealingly abutted with the side of the sealing inner protrusion (14) facing the main control cavity (2), and adapted to close the overflow valve cavity (1).

4. The burst disc safety valve of claim 2 wherein, The second pilot valve (6) further comprises: A second spool piece (63) is arranged in the second switching cavity (61) and extends into the second control cavity (62). The second spool piece (63) is connected to the proportional adjusting structure (7) and is adapted to move under the pressure difference between the second control cavity (62) and the second switching cavity (61) and the action of the proportional adjusting structure (7), and is adapted to adjust the internal pressure of the main control lower cavity (22).

5. The burst disc safety valve of claim 4 wherein, The second control cavity (62) further comprises: A second control lower cavity (622) is arranged separately from the second control upper cavity (621) and is in communication with the pressure measuring pipe (4); A second control piston piece (623) is arranged between the second control upper cavity (621) and the second control lower cavity (622) and is connected to the second spool piece (63). The second control piston piece (623) is adapted to separate the second control upper cavity (621) and the second control lower cavity (622), and to adjust the internal pressure of the main control lower cavity (22) under the pressure difference between the second control upper cavity (621), the second control lower cavity (622) and the second switching cavity (61) and the action of the proportional adjusting structure (7).

6. The burst disc safety valve of claim 5 wherein, The second switching cavity (61) further comprises: A second switching middle cavity (612) is arranged adjacent to the second switching upper cavity (611) and is in communication with the main control lower cavity (22); A second switching lower cavity (613) is arranged on the side of the second switching middle cavity (612) away from the second switching upper cavity (611) and is in communication with the water outlet (11); A second switching piston piece (614) is arranged between the second switching upper cavity (611) and the second switching lower cavity (613) and is connected to the second spool piece (63). The second switching piston piece (614) has a first working position in which it blocks the second switching lower cavity (613) and connects the second switching upper cavity (611) and the second switching middle cavity (612), and a second working position in which it blocks the second switching upper cavity (611) and connects the second switching middle cavity (612) and the second switching lower cavity (613).

7. The burst disc safety valve of claim 1 wherein, The first control cavity (52) further comprises: A first control lower cavity (522) is arranged separately from the second control upper cavity (621) and is adapted to be in communication with the outside world; A first control piston piece (523) is arranged between the first control upper cavity (521) and the first control lower cavity (522) and is connected to the first spool piece (53). The first control piston piece (523) is adapted to separate the first control upper cavity (521) and the first control lower cavity (522), and to adjust the internal pressure of the main control upper cavity (21) under the pressure difference between the first control upper cavity (521), the first control lower cavity (522) and the first switching cavity (51) and the action of the proportional adjusting structure (7).

8. The burst disc safety valve of claim 7, wherein, The first switching cavity (51) further comprises: A first switching middle cavity (512) is arranged adjacent to the first switching upper cavity (511) and is in communication with the main control upper cavity (21); The first switch lower cavity (513) is arranged at the side away from the first switch upper cavity (511) of the first switch middle cavity (512) and is connected with the water inlet end (12); The first switch piston piece (514) is arranged between the first switch upper cavity (511) and the first switch lower cavity (513) and is connected with the first valve core piece (53), has a third working position of blocking the first switch lower cavity (513), communicating the first switch upper cavity (511) and the first switch middle cavity (512), and a fourth working position of blocking the first switch upper cavity (511), communicating the first switch middle cavity (512) and the first switch lower cavity (513).

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