Gravity type resin backflow prevention device

Abstract

The invention relates to the technical field of condensed water and heat supply network drainage, in particular to a gravity type resin backflow prevention device which comprises a valve body assembly, a valve body assembly, a valve body assembly and a valve body assembly, and the valve body assembly comprises a valve outer wall and a connecting groove formed in the surface of the valve outer wall; the rotating assembly comprises an end cover connected to the interior of the connecting groove and a valve rod shaft arranged in the middle of the end cover; the intercepting assembly comprises a valve clack and a limiting ring arranged on the surface of the valve clack. When fluid flows forwards, the valve clack is pushed by the fluid, and the limiting ring drives the valve rod shaft to rotate. In the reverse water hammer process, the device is rapidly closed only by means of the gravity of the device, resin particles in fluid are intercepted, and corrosion of water feeding pump blades, a boiler, a steam turbine and the like caused by decomposition after the resin particles flow back to a thermodynamic system is prevented. Meanwhile, the valve clack and the valve seat ring which are eccentrically and obliquely designed ensure that the valve clack rotates smoothly and is closed tightly. In addition, the filter screen eliminates the impact of fluid on the valve clack when a reverse water hammer is carried out, and the service life is prolonged; the valve rod shaft and the valve clack are integrally designed, the size of the device is reduced, and the installation space is saved.

Description

Technical Field

[0001] The invention relates to the technical field of condensate water and heat network drainage, in particular to a gravity-type resin backflow prevention device. Background Art

[0002] In power plants, chemical plants and other fields, medium-pressure condensate polishing equipment and heat network drain recovery treatment ion exchangers, including high-speed mixed beds and high-speed cation-anion beds, are used. When the water pump pressure in front of the water treatment equipment suddenly decreases or loses pressure, it will cause "reverse water hammer", which will cause the resin particles in the water treatment equipment to flow back into the pipe in front of the equipment inlet, causing the feed pump filter to be blocked by resin, resulting in emergency shutdown of the unit; in addition, the resin particles that flow back into the pipe may enter the thermal system, where they release low-molecular organic acids and a large amount of inorganic anions, such as chloride ions and sulfate ions, under high temperature and high pressure, affecting the quality of water vapor, causing the boiler water to run at a low pH value for a long time, forming acid corrosion, and "hydrogen embrittlement" in severe cases; causing salt accumulation in the high-pressure cylinder of the turbine and corrosion in the low-pressure cylinder, affecting the efficiency of the turbine, and also causing salt accumulation in the flow section of the superheater, increasing the possibility of superheater tube burst.

[0003] Some power plants install check valves on the mixed bed inlet pipes. When reverse water hammer occurs, the check valve closes slowly and loosely; after the resin is intercepted, the pressure difference before and after the device increases sharply, and the check valve is easily damaged. In view of this, a gravity-type anti-resin backflow device is proposed to solve the above problems. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems in the above-mentioned prior art that the check valve closes slowly and loosely; the pressure difference before and after the device increases sharply after the resin is intercepted, and the check valve is very easy to be damaged, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a gravity-type resin backflow prevention device, comprising:

[0007] A valve body assembly, comprising a valve outer wall and a connecting groove arranged on a surface of the valve outer wall; and

[0008] A rotating assembly, comprising an end cover connected to the interior of the connecting groove and a valve stem shaft arranged in the middle of the end cover; and,

[0009] An interception assembly, comprising a valve flap, a filter screen and a limit ring arranged on the surface of the filter screen;

[0010] When the interception assembly is pushed by the fluid, the limit ring drives the valve stem shaft to rotate.

[0011] As a preferred solution of the gravity-type resin backflow prevention device of the present invention, wherein: a bolt hole is arranged inside the connecting groove, and the end cover is connected to the bolt hole by bolts.

[0012] As a preferred solution of the gravity-type anti-resin backflow device of the present invention, the connecting groove is arranged at a position slightly above the middle of the outer wall of the valve, and the limiting ring is arranged at a position slightly above the middle of the interception component.

[0013] As a preferred solution of the gravity-type resin backflow prevention device of the present invention, the interception component has two layers: a valve flap and a filter screen. The valve flap surface has uniform holes, the filter screen cross section is an isosceles trapezoid, and the gaps between the filter screens are smaller than the resin particle size.

[0014] As a preferred solution of the gravity-type resin backflow prevention device of the present invention, wherein: the surface of the valve disc is evenly opened with holes.

[0015] As a preferred solution of the gravity-type resin backflow prevention device of the present invention, wherein: a valve seat ring is fixed to the inner wall of the valve outer wall, and the valve seat ring is arranged obliquely relative to the valve outer wall.

[0016] As a preferred solution of the gravity-type resin backflow prevention device of the present invention, the inner surface of the valve seat ring is an inclined surface, and the outer surface contour of the interception component is the same as the inner surface contour of the valve seat ring.

[0017] As a preferred solution of the gravity-type resin backflow prevention device of the present invention, the valve body assembly further includes a baffle, and the baffle is arranged corresponding to the valve stem shaft.

[0018] As a preferred solution of the gravity-type resin backflow prevention device of the present invention, wherein: the valve stem shaft is rotatably connected to the end cover.

[0019] As a preferred solution of the gravity-type resin backflow prevention device of the present invention, wherein: the valve stem shaft is fixedly connected to the limit ring.

[0020] The beneficial effects of the gravity-type anti-resin backflow device of the present invention are: the forward-flowing fluid is allowed to pass normally through the rotatable interception component, and the flow rate of the original fluid is hardly affected. At the same time, the inclined interception component can intercept the resin particles in the fluid during reverse water hammer, and prevent the resin particles from flowing back into the thermal system and causing corrosion of the water pump blades, boilers, steam turbines, etc. While eliminating reverse water hammer and preventing backflow, the valve flap plays a role in fixing the filter screen and increasing the strength of the filter screen, preventing local deformation or even damage of the filter screen during long-term use or under large impact conditions, thereby extending the overall service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0022] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the baffle position of the present invention.

[0024] Figure 3 It is a schematic diagram of the connection between the filter screen and the valve disc in the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1, reference Figure 1 to Figure 3 , is the first embodiment of the present invention, which provides a gravity-type anti-resin backflow device, including a gravity-type anti-resin backflow device, including,

[0029] The valve body assembly 100 includes a valve outer wall 102 and a connecting groove 101 disposed on the surface of the valve outer wall 102; and

[0030] The rotating assembly 200 includes an end cap 201 connected to the inside of the connecting groove 101 and a valve stem shaft 202 arranged in the middle of the end cap 201. The valve stem shaft 202 is located in the upper middle part of the intercepting assembly 300, so that the intercepting assembly 300 can be closed quickly (in a few tenths of a second) only by its own gravity when there is no forward fluid flow; and,

[0031] The interception assembly 300 includes a valve flap 302, a filter screen 303 and a limit ring (301) arranged on the surface of the filter screen 303; wherein,

[0032] When the interception assembly 300 is pushed by the fluid, the limiting ring 301 drives the valve stem shaft 202 to rotate.

[0033] Furthermore, the connecting groove 101 is arranged at a position slightly above the middle of the valve outer wall 102 , and the limiting ring 301 is arranged at a position slightly above the middle of the intercepting assembly 300 .

[0034] It is convenient to connect the interception component 300 with the limit ring 301; it increases the pushing force of the fluid on the interception component 300 and reduces the impact on the original fluid flow.

[0035] The interception assembly 300 is a double-layer structure, including a valve flap 302 and a filter screen 303. The cross section of the filter screen 303 is an isosceles trapezoid, and the gap between the filter screens 303 is smaller than the resin particle size.

[0036] The valve flap 302 has holes evenly distributed on its surface, which can fix the filter 303 and increase the strength of the filter 303 while minimizing the obstruction to the fluid flow, thereby preventing the filter 303 from being partially deformed or even damaged during long-term use or under high impact conditions, thereby extending the overall service life of the device.

[0037] The filter 303 blocks the resin particles. Its trapezoidal cross section is smaller than the rectangular cross section, which can prevent the resin particles from getting stuck in the gaps of the filter and blocking the fluid flow path. Even if a small amount of resin particles remain in the gaps, after the fluid flows in the forward direction, the trapezoidal cross section makes it very easy for the resin particles to be washed down by the fluid, thereby preventing the resin particles from clogging the filter during the next reverse water hammer, resulting in a reduction in the fluid flow path, making it difficult for the fluid to circulate, and increasing the pressure difference before and after the device, affecting the normal use of the device or even damaging it. The impact force of the fluid on the valve flap 302 is reduced while eliminating the reverse water hammer and preventing backflow.

[0038] The valve stem shaft 202 is arranged in the upper middle position, so that the interception assembly 300 can be closed quickly (in a few tenths of a second) only by its own gravity, which is very reliable.

[0039] The baffle 103 prevents the valve disc from opening too much in the forward direction and failing to close in time during reverse water hammer.

[0040] Usage process: When the fluid flows forward, the fluid pushes the interception component 300 to move counterclockwise. When the interception component 300 is pushed, the limit ring 301 drives the valve stem shaft 202 to rotate, and the valve stem shaft 202 rotates inside the end cover 201, and the fluid passes normally; when the fluid flows reversely, the fluid pushes the interception component 300 to move clockwise, and the interception component 300 is blocked by the valve seat ring 400 and stays at a position with an angle of 10° to 20° with the vertical direction. At this time, the reverse flow fluid passes through the filter screen 303 and passes through the valve disc 302, which can reduce the water hammer effect caused by the reverse flow. At the same time, the resin particles in the fluid can be blocked by the filter screen 303 on the surface of the valve disc 302.

[0041] Preventing problems such as decomposition after resin particles flow back into the thermal system can reduce the corrosion risk of boilers, steam turbines, etc., and the risk of safety accidents such as boiler tube burst and turbine blade breakage caused by corrosion during unit operation, and avoid irreversible damage to the unit caused by emergency shutdown of the unit, as well as load shocks to the power grid; it can also reduce economic losses caused by downtime for maintenance, and save maintenance material and labor costs; in addition, after the quality of feed water is improved, the degree of corrosion, scaling and salt accumulation of the unit is reduced, so that the thermal efficiency of the unit is maintained at a high level for a long time, indirectly saving coal consumption for power generation.

[0042] This device has the following three states: (1) When no fluid passes through, the interception component 300 is tightly closed by gravity; (2) When the fluid flows in the forward direction, the fluid pushes the interception component 300 to rotate counterclockwise until the maximum angle, which hardly affects the forward flow of the fluid, and the fluid flows normally. In addition, the eccentrically designed outer contour of the interception component 300 and the inner contour of the valve seat ring 400 are matched to ensure that the interception component 300 will not get stuck during the opening process; (3) During reverse water hammer, it relies on gravity and the thrust of the fluid to close in an instant (a few tenths of a second) in the clockwise direction. In addition, the eccentrically designed outer contour of the interception component 300 and the inner contour of the valve seat ring 400 are matched to ensure that the interception component 300 will not get stuck during the closing process, and it will eventually close tightly with the valve seat ring 400.

[0043] This device has the following four advantages: (1) Gravity type, that is, it does not rely on external forces such as electricity, but can close quickly (a few tenths of a second) by relying solely on its own gravity, which is very reliable; (2) The eccentrically designed outer contour of the interception component 300 and the inner contour of the valve seat ring 400 are matched to ensure that the interception component 300 will not get stuck during the forward opening and reverse closing processes, and will eventually close tightly with the valve seat ring 400; (3) During reverse water hammer, the filter screen 303 only allows water to pass through, intercepting resin particles in the fluid. Its trapezoidal cross-section is smaller than the rectangular cross-section, which can prevent resin particles from getting stuck in the gaps of the filter screen and blocking the fluid flow channel; and even if a small amount of resin particles remain in the gaps, they will not be blocked during the forward flow of the fluid. Afterwards, the trapezoidal cross section makes it very easy for the resin particles to be washed down by the fluid, thereby preventing the resin particles from clogging the filter screen during the next reverse water hammer, resulting in a reduction in the fluid flow path, making it difficult for the fluid to circulate, and increasing the pressure difference before and after the device, affecting the normal use of the device or even damaging it; and while eliminating the reverse water hammer and preventing backflow, it reduces the impact force of the fluid on the valve disc 302; at the same time, the valve disc 302 has holes evenly opened on its surface, which, while minimizing the obstruction to the flow of the fluid, plays a role in fixing the filter screen 303 and increasing the strength of the filter screen 303, preventing the filter screen 303 from being partially deformed or even damaged during long-term use or under large impact conditions, thereby extending the overall service life of the device. (4) The integrated design of the valve stem shaft 202 and the interception assembly 300 reduces the size of the device, saves installation space, and facilitates installation on water inlet pipes with many meters, avoiding possible pipeline changes or meter displacement, and making the arrangement of each meter more compact, with obvious installation advantages.

[0044] Example 2, reference Figure 1 to Figure 3 , which is the second embodiment of the present invention, is different from the previous embodiment in that it also includes:

[0045] The connection groove 101 is provided with a bolt hole inside, and the end cover 201 is connected to the bolt hole by bolts.

[0046] The end cover 201 can be easily removed by bolt connection, so as to perform maintenance on the end cover 201 .

[0047] A valve seat ring 400 is fixed to the inner wall of the valve outer wall 102 , and the valve seat ring 400 is arranged to be inclined relative to the valve outer wall 102 .

[0048] The angle of the interception assembly 300 is changed so that the fluid can easily push the interception assembly 300 away.

[0049] The inner surface of the valve seat ring 400 is an inclined surface, and the outer surface contour of the interception assembly 300 is the same as the inner surface contour of the valve seat ring 400 .

[0050] The inclined surface can prevent the interception component 300 from rotating in the reverse direction beyond the design range, thereby ensuring that the interception component 300 cannot rotate in the reverse direction beyond the design range.

[0051] Usage process: The inclined setting of the valve seat ring 400 can limit the position of the interception component 300, and is matched with the eccentrically designed outer contour of the interception component 300 to ensure that the interception component 300 will not get stuck during the forward opening and reverse closing processes, and finally close tightly with the valve seat ring 400 to intercept resin particles in the fluid during reverse water hammer.

[0052] Example 3, reference Figure 1 to Figure 3 , which is the third embodiment of the present invention, is different from the previous embodiment in that it also includes:

[0053] The valve body assembly 100 further includes a baffle 103 , which is disposed corresponding to the valve stem shaft 202 .

[0054] The baffle 103 can block the interception assembly 300 and limit the rotation angle of the interception assembly 300 .

[0055] The valve stem shaft 202 is rotatably connected to the end cover 201 .

[0056] It is convenient for the valve stem shaft 202 to rotate.

[0057] The valve stem shaft 202 is fixedly connected to the limiting ring 301 .

[0058] Increase the rotation angle of the interception assembly 300.

[0059] Usage process: When the fluid flows in the forward direction, due to the obstruction of the baffle 103, the interception component 300 finally stabilizes at an angle of 60° to 90° with the vertical direction; the fluid passing through the interception component 300 is reduced, reducing the impact on the original fluid flow.

[0060] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0061] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0062] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gravity-type resin backflow prevention device, characterized in that: include, A valve body assembly (100) comprises a valve outer wall (102) and a connecting groove (101) arranged on the surface of the valve outer wall (102); and, A rotating assembly (200) comprises an end cover (201) connected to the inside of the connecting groove (101) and a valve stem shaft (202) arranged in the middle of the end cover (201); and, The interception assembly (300) comprises a valve flap (302), a filter screen (303) and a limit ring (301) arranged on the surface of the filter screen (303); wherein: When the interception assembly 300 is pushed by the fluid, the limiting ring (301) drives the valve stem shaft (202) to rotate.

2. The gravity-type resin backflow prevention device according to claim 1, characterized in that: A bolt hole is provided inside the connection groove (101), and the end cover (201) is connected to the bolt hole via bolts.

3. The gravity-type resin backflow prevention device according to claim 2, characterized in that: The connecting groove (101) is arranged at a position slightly above the middle of the valve outer wall (102), and the limiting ring (301) is arranged at a position slightly above the middle of the interception assembly (300).

4. The gravity-type resin backflow prevention device according to claim 3, characterized in that: The interception component has two layers: a valve flap (302) and a filter screen (303).

5. The gravity-type resin backflow prevention device according to claim 4, characterized in that: The surface of the valve flap (302) is evenly perforated, the cross section of the filter screen (303) is an isosceles trapezoid, and the gaps between the filter screens (303) are smaller than the diameter of the resin particles.

6. The gravity-type resin backflow prevention device according to claim 5, characterized in that: A valve seat ring (400) is fixed to the inner wall of the valve outer wall (102), and the valve seat ring (400) is arranged to be inclined relative to the valve outer wall (102).

7. The gravity-type resin backflow prevention device according to claim 6, characterized in that: The inner surface of the valve seat ring (400) is an inclined surface, and the outer surface contour of the interception component (300) is the same as the inner surface contour of the valve seat ring (400).

8. The gravity-type resin backflow prevention device according to claim 7, characterized in that: The valve body assembly (100) further comprises a baffle (103), and the baffle (103) is arranged corresponding to the valve stem shaft (202).

9. The gravity-type resin backflow prevention device according to claim 8, characterized in that: The valve stem shaft (202) is rotatably connected to the end cover (201).

10. The gravity-type resin backflow prevention device according to claim 9, characterized in that: The valve stem shaft (202) is fixedly connected to the limiting ring (301).

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