Cavitation-preventing drainage device and air-cooled condenser system

Abstract

The utility model provides an anti-cavitation drainage device and an air-cooled condenser system. The anti-cavitation drainage device comprises an input header pipe, a first branch pipe, a second branch pipe, an output header pipe, a first drainage pump, a second drainage pump, a first pump front exhaust valve, a second pump front exhaust valve, a first pump rear discharge valve, a second pump rear discharge valve, a communicating pipe and a communicating valve. Wherein one of the first drainage pump and the second drainage pump serves as an operation pump, the other one serves as a standby pump, and the operation pump can conduct pump filling on the standby pump through the communicating pipe. In the scheme, the standby pump and the communication valve are opened before standby of the standby pump is finished, so that the operation pump is communicated with the standby pump, the standby pump is filled through the operation pump, and the problem of cavitation of the drain pump caused by pump filling in other modes is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation devices, and in particular, to an anti-cavitation drainage device and an air-cooled condenser system. Background Technique

[0002] High-pressure steam enters a condensing steam turbine through a quick-acting valve to do work. The steam first flows through a nozzle and expands in the nozzle to obtain a very high speed. Then, the high-velocity steam flows through the moving blades on the steam turbine rotor to do work, driving the steam turbine rotor to rotate. Part of the exhausted steam condensate after the high-pressure steam does work in the steam turbine enters a drainage tank, and the uncondensed exhausted steam is discharged to an air-cooling system for cooling (in an air-cooled surface condenser, air passes horizontally outside the tube bundle by means of a fan or by natural ventilation, while the steam flows inside the tube bundle and is condensed into water). The cooled condensate is collected and enters a condensate tank.

[0003] Operating principle of a drainage pump: Before the drainage pump works, first fill the pump with liquid, and then start the drainage pump. The impeller rotates rapidly, and the blades of the impeller drive the liquid to rotate. When the liquid rotates, it flows towards the outer edge of the impeller by inertia. At the same time, the impeller sucks in liquid from the suction chamber. During this process, the liquid in the impeller flows around the blades. In the flow-around motion, the liquid acts on the blades with a lifting force, and in turn, the blades act on the liquid with a force that is equal in magnitude and opposite in direction to this lifting force. This force does work on the liquid, enabling the liquid to obtain energy and flow out of the impeller. At this time, both the kinetic energy and the pressure energy of the liquid increase.

[0004] The drainage pump transfers the mechanical energy of the prime mover to the liquid by the action of the rotating impeller on the liquid. Due to the action of the drainage pump, during the process of the liquid flowing from the impeller inlet to the outlet, both its velocity energy and pressure energy increase. The liquid discharged from the impeller passes through the discharge chamber, and most of the velocity energy is converted into pressure energy, and then it is transported along the discharge pipeline. At this time, a vacuum or low pressure is formed at the impeller inlet due to the discharge of the liquid, and the liquid in the suction pool is pressed into the impeller inlet under the action of the liquid surface pressure (atmospheric pressure). Thus, the rotating impeller continuously sucks in and discharges the liquid.

[0005] Cavitation of the drain pump is a phenomenon in which flowing fluid generates bubbles due to a local pressure drop. When cavitation occurs in the pump, erosion of machine parts will be caused at the cavitation site, and further development will result in a decrease in head and the generation of vibration and noise. Causes of pump cavitation: The pump does work on the liquid through a rotating impeller, increasing the energy of the liquid. During the interaction process, the velocity and pressure of the liquid change. Usually, the inlet of the drain pump impeller is the place where the pressure is the lowest. If the pressure at this place is equal to or lower than the vaporization pressure of the liquid at this temperature, a large amount of steam and gases dissolved in the liquid will escape from the liquid, forming many small bubbles mixed with steam and gases. When these small bubbles flow into the high-pressure area with the liquid, since the pressure inside the bubble is the vaporization pressure and the pressure around the bubble is greater than the vaporization pressure, a pressure difference is generated. Under the action of this pressure difference, the bubble is compressed and broken and re-condensed.

[0006] During the condensation process, liquid particles accelerate from all around towards the center of the bubble. At the moment of condensation, the particles collide with each other, generating a very high local pressure. If these bubbles break and condense near the metal surface, the liquid particles will continuously strike the metal surface like countless small bullets. Under the continuous strikes with a large pressure and high frequency, the metal surface is gradually damaged due to fatigue. Usually, this kind of damage is called erosion. There are also some active gases (such as oxygen, etc.) mixed in the generated bubbles. With the heat released during the condensation of the bubbles, it has a chemical corrosion effect on the metal. The combined action of chemical corrosion and mechanical erosion further accelerates the metal damage speed. This phenomenon is the cavitation damage phenomenon.

[0007] The condensate in the drain tank is usually sent to the condensate tank through two parallel drain pumps and then transported to the turbine condensate pipe network by the condensate pump. When the drain pump is operating during operations such as cleaning the filter screen, valve internal leakage, and pump switching, cavitation and non-delivery often occur, the liquid level in the drain tank is high, the steam turbine is interlocked to stop, the production of the device is interrupted, and a large amount of steam is consumed during startup and shutdown, resulting in huge economic losses. At the same time, it brings serious hidden dangers to the stable operation of the device production. In addition, the inability of the drain pump to deliver will cause the rear cylinder to be flooded with condensate, damaging the steam turbine. Summary of the Utility Model

[0008] The utility model provides an anti-cavitation drain device and an air-cooled condenser system to solve the cavitation problem of the drain pump in the prior art and reduce the equipment failure rate.

[0009] To solve the above problems, according to one aspect of the present utility model, the present utility model provides an anti-cavitation drainage device, which includes an input main pipe, a first branch pipe, a second branch pipe, an output main pipe, a first drainage pump, a second drainage pump, a first pre-pump exhaust valve, a second pre-pump exhaust valve, a first post-pump discharge valve, a second post-pump discharge valve, a connecting pipe and a connecting valve; one end of the first branch pipe is connected to the input main pipe, and the other end of the first branch pipe is connected to the output main pipe. One end of the second branch pipe is connected to the input main pipe, and the other end of the second branch pipe is connected to the output main pipe; the first drainage pump is installed on the first branch pipe, the second drainage pump is installed on the second branch pipe, the first pre-pump exhaust valve is installed on the first branch pipe and is located between the input main pipe and the first drainage pump, the second pre-pump exhaust valve is installed on the second branch pipe and is located between the input main pipe and the second drainage pump, the first post-pump discharge valve is installed on the first branch pipe and is located between the first drainage pump and the output main pipe, the second post-pump discharge valve is installed on the second branch pipe and is located between the second drainage pump and the output main pipe, one end of the connecting pipe is connected to the first post-pump discharge valve, the other end of the connecting pipe is connected to the second post-pump discharge valve, and the connecting valve is installed on the connecting pipe; wherein, one of the first drainage pump and the second drainage pump serves as the operating pump, and the other serves as the standby pump, and the operating pump can fill the standby pump through the connecting pipe.

[0010] Furthermore, the anti-cavitation drainage device further includes a first pre-pump drain valve and a second pre-pump drain valve. The first pre-pump drain valve is installed on the first branch pipe and is located between the input main pipe and the first pre-pump exhaust valve. The second pre-pump drain valve is installed on the second branch pipe and is located between the input main pipe and the second pre-pump exhaust valve. The first pre-pump drain valve is used for draining water when the first drainage pump is being repaired, and the second pre-pump drain valve is used for draining water when the second drainage pump is being repaired.

[0011] Furthermore, the anti-cavitation drainage device further includes a first inlet valve and a second inlet valve. The first inlet valve is installed on the first branch pipe and is located between the input main pipe and the first pre-pump drain valve. The second inlet valve is installed on the second branch pipe and is located between the input main pipe and the second pre-pump drain valve. The first inlet valve is used to hand over the first drainage pump to isolate the condensate when the first drainage pump is being repaired, and the second inlet valve is used to hand over the second drainage pump to isolate the condensate when the second drainage pump is being repaired.

[0012] Furthermore, the anti-cavitation drainage device further includes a first filter and a second filter. The first filter is installed on the first branch pipe and is located between the first pre-pump exhaust valve and the first pre-pump drain valve. The second filter is installed on the second branch pipe and is located between the second pre-pump exhaust valve and the second pre-pump drain valve. The first filter is used to prevent debris from entering the first drainage pump, and the second filter is used to prevent debris from entering the second drainage pump.

[0013] Furthermore, the anti-cavitation drainage device further includes a discharge pipe, and the first pre-pump exhaust valve and the second pre-pump exhaust valve are respectively connected to the discharge pipe.

[0014] Further, the inlet of the input main pipe is connected to the drain tank, and the outlet of the discharge pipe is connected to the drain tank.

[0015] Further, the cavitation - proof drain device further includes a first pump outlet check valve and a second pump outlet check valve. The first pump outlet check valve is installed on the first branch pipe and is located between the first drain pump and the output main pipe. The second pump outlet check valve is installed on the second branch pipe and is located between the second drain pump and the output main pipe. The first pump outlet check valve and the second pump outlet check valve are used to prevent fluid backflow.

[0016] Further, the cavitation - proof drain device further includes a first pump outlet valve and a second pump outlet valve. The first pump outlet valve is installed on the first branch pipe and is located between the first drain pump and the output main pipe. The second pump outlet valve is installed on the second branch pipe and is located between the second drain pump and the output main pipe. The first pump outlet valve is used to hand over the first drain pump to isolate the condensate when the first drain pump is under maintenance. The second pump outlet valve is used to hand over the second drain pump to isolate the condensate when the second drain pump is under maintenance.

[0017] Further, the cavitation - proof drain device further includes a first valve and a second valve. The first valve is installed on the connecting pipe and is located between the first pump discharge valve and the connecting valve. The second valve is installed on the connecting pipe and is located between the second pump discharge valve and the connecting valve.

[0018] According to another aspect of the present utility model, an air - cooled condenser system is provided. The air - cooled condenser system includes the above - mentioned cavitation - proof drain device.

[0019] Applying the technical solution of the present utility model, a cavitation-proof drainage device is provided, which includes an input main pipe, a first branch pipe, a second branch pipe, an output main pipe, a first drainage pump, a second drainage pump, a first pre-pump exhaust valve, a second pre-pump exhaust valve, a first post-pump discharge valve, a second post-pump discharge valve, a connecting pipe and a connecting valve; one end of the first branch pipe is connected to the input main pipe, and the other end of the first branch pipe is connected to the output main pipe; one end of the second branch pipe is connected to the input main pipe, and the other end of the second branch pipe is connected to the output main pipe; the first drainage pump is installed on the first branch pipe, the second drainage pump is installed on the second branch pipe, the first pre-pump exhaust valve is installed on the first branch pipe and is located between the input main pipe and the first drainage pump, the second pre-pump exhaust valve is installed on the second branch pipe and is located between the input main pipe and the second drainage pump, the first post-pump discharge valve is installed on the first branch pipe and is located between the first drainage pump and the output main pipe, the second post-pump discharge valve is installed on the second branch pipe and is located between the second drainage pump and the output main pipe, one end of the connecting pipe is connected to the first post-pump discharge valve, the other end of the connecting pipe is connected to the second post-pump discharge valve, and the connecting valve is installed on the connecting pipe; wherein, one of the first drainage pump and the second drainage pump is used as an operating pump, and the other is used as a standby pump, and the operating pump can fill the standby pump through the connecting pipe. In this solution, before the standby pump ends its standby state, the standby pump and the connecting valve are opened, so that the operating pump and the standby pump are connected, and the operating pump fills the standby pump, thereby preventing the problem of cavitation of the drainage pump caused by other filling methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0021] Figure 1 The structural schematic diagram of the cavitation-proof drainage device provided by the embodiment of the present utility model is shown.

[0022] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0023] 11. Input main pipe;

[0024] 12. First branch pipe; 13. Second branch pipe;

[0025] 14. Output main pipe;

[0026] 15. Discharge pipe;

[0027] 21. First drainage pump; 22. Second drainage pump;

[0028] 31. First pre-pump exhaust valve; 32. Second pre-pump exhaust valve;

[0029] 33. First post-pump discharge valve; 34. Second post-pump discharge valve;

[0030] 41. Connecting pipe; 42. Connecting valve;

[0031] 43. First valve; 44. Second valve;

[0032] 51. First pre-pump drain valve; 52. Second pre-pump drain valve;

[0033] 61. First inlet valve; 62. Second inlet valve;

[0034] 71. First filter; 72. Second filter;

[0035] 81. First check valve at pump outlet; 82. Second check valve at pump outlet;

[0036] 91. First pump outlet valve; 92. Second pump outlet valve. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] As Figure 1As shown in the figure, an embodiment of the present utility model provides an anti-cavitation drainage device, which includes an input main pipe 11, a first branch pipe 12, a second branch pipe 13, an output main pipe 14, a first drainage pump 21, a second drainage pump 22, a first pre-pump exhaust valve 31, a second pre-pump exhaust valve 32, a first post-pump discharge valve 33, a second post-pump discharge valve 34, a connecting pipe 41 and a connecting valve 42; one end of the first branch pipe 12 is connected to the input main pipe 11, and the other end of the first branch pipe 12 is connected to the output main pipe 14; one end of the second branch pipe 13 is connected to the input main pipe 11, and the other end of the second branch pipe 13 is connected to the output main pipe 14; the first drainage pump 21 is installed on the first branch pipe 12, the second drainage pump 22 is installed on the second branch pipe 13, the first pre-pump exhaust valve 31 is installed on the first branch pipe 12 and is located between the input main pipe 11 and the first drainage pump 21, the second pre-pump exhaust valve 32 is installed on the second branch pipe 13 and is located between the input main pipe 11 and the second drainage pump 22, the first post-pump discharge valve 33 is installed on the first branch pipe 12 and is located between the first drainage pump 21 and the output main pipe 14, the second post-pump discharge valve 34 is installed on the second branch pipe 13 and is located between the second drainage pump 22 and the output main pipe 14, one end of the connecting pipe 41 is connected to the first post-pump discharge valve 33, the other end of the connecting pipe 41 is connected to the second post-pump discharge valve 34, and the connecting valve 42 is installed on the connecting pipe 41; wherein, one of the first drainage pump 21 and the second drainage pump 22 serves as the operating pump, and the other serves as the standby pump, and the operating pump can fill the standby pump through the connecting pipe 41.

[0039] In this solution, before the standby pump (one of the first drainage pump 21 and the second drainage pump 22) ends standby, the standby pump and the connecting valve 42 are opened, so that the operating pump and the standby pump are connected, and the operating pump fills the standby pump, thereby preventing the problem of cavitation of the drainage pump caused by other filling methods.

[0040] In this solution, the anti-cavitation drainage device further includes a first pre-pump drain valve 51 and a second pre-pump drain valve 52. The first pre-pump drain valve 51 is installed on the first branch pipe 12 and is located between the input main pipe 11 and the first pre-pump exhaust valve 31. The second pre-pump drain valve 52 is installed on the second branch pipe 13 and is located between the input main pipe 11 and the second pre-pump exhaust valve 32. The first pre-pump drain valve 51 is used for draining water when the first drainage pump 21 is being repaired, and the second pre-pump drain valve 52 is used for draining water when the second drainage pump 22 is being repaired.

[0041] By adding the pre-pump drain valve, during the repair process of the pump, the condensate in the pipeline before the pump can be conveniently drained, avoiding the accumulation of condensate in the pipeline, and reducing the inconvenience and potential safety hazards during the repair.

[0042] Furthermore, the anti-cavitation drain device also includes a first inlet valve 61 and a second inlet valve 62. The first inlet valve 61 is installed on the first branch pipe 12 and is located between the input main pipe 11 and the first pump front drain valve 51. The second inlet valve 62 is installed on the second branch pipe 13 and is located between the input main pipe 11 and the second pump front drain valve 52. The first inlet valve 61 is used to hand over the first drain pump 21 to isolate the condensate when the first drain pump 21 is overhauled, and the second inlet valve 62 is used to hand over the second drain pump 22 to isolate the condensate when the second drain pump 22 is overhauled.

[0043] By setting the inlet valve, the condensate can be effectively isolated during pump maintenance to prevent the condensate from entering the pump body and causing damage, while facilitating the switching and control of the system.

[0044] In the present embodiment, the anti-cavitation drain device also includes a first filter 71 and a second filter 72. The first filter 71 is installed on the first branch pipe 12 and is located between the first pump front exhaust valve 31 and the first pump front drain valve 51. The second filter 72 is installed on the second branch pipe 13 and is located between the second pump front exhaust valve 32 and the second pump front drain valve 52. The first filter 71 is used to prevent debris from entering the first drain pump 21, and the second filter 72 is used to prevent debris from entering the second drain pump 22.

[0045] By adding a filter, impurities in the condensate can be effectively removed, the pump body can be protected from wear and blockage, and the service life of the pump can be extended. It is suitable for industrial systems with poor water quality or containing more impurities.

[0046] like Figure 1 As shown, the anti-cavitation drain device further includes a discharge pipe 15 , and a first pump front exhaust valve 31 and a second pump front exhaust valve 32 are respectively connected to the discharge pipe 15 .

[0047] By setting up a discharge pipe, the gas and steam discharged from the exhaust valve in front of the pump can be guided to a safe location, avoiding pressure shock to the pump body and the system.

[0048] Furthermore, the inlet of the input main pipe 11 is connected to the drain tank, and the outlet of the discharge pipe 15 is connected to the drain tank. This design allows the exhausted gas to return to the drain tank, forming a closed circulation system, which not only reduces energy waste, but also avoids environmental pollution.

[0049] In the present embodiment, the anti-cavitation drain device also includes a first pump outlet check valve 81 and a second pump outlet check valve 82. The first pump outlet check valve 81 is installed on the first branch pipe 12 and is located between the first drain pump 21 and the output main pipe 14. The second pump outlet check valve 82 is installed on the second branch pipe 13 and is located between the second drain pump 22 and the output main pipe 14. The first pump outlet check valve 81 and the second pump outlet check valve 82 are used to prevent fluid backflow.

[0050] By setting up a check valve at the pump outlet, backflow can be prevented when the drainage pump stops running, protecting the pump body from damage and ensuring the normal operation of the system. It is applicable to industrial systems that need to prevent fluid backflow, such as air-cooled condenser systems, thermal cycle systems, etc.

[0051] As Figure 1 shown, the cavitation-proof drainage device further includes a first pump outlet valve 91 and a second pump outlet valve 92. The first pump outlet valve 91 is installed on the first branch pipe 12 and is located between the first drainage pump 21 and the output main pipe 14. The second pump outlet valve 92 is installed on the second branch pipe 13 and is located between the second drainage pump 22 and the output main pipe 14. The first pump outlet valve 91 is used to hand over the first drainage pump 21 to isolate condensate when the first drainage pump 21 is under maintenance, and the second pump outlet valve 92 is used to hand over the second drainage pump 22 to isolate condensate when the second drainage pump 22 is under maintenance.

[0052] By setting up pump outlet valves, drainage can be effectively isolated during pump maintenance, avoiding the accumulation of drainage in the pump body and facilitating system switching and control.

[0053] As Figure 1 shown, the cavitation-proof drainage device further includes a first valve 43 and a second valve 44. The first valve 43 is installed on the connecting pipe 41 and is located between the first post-pump discharge valve 33 and the connecting valve 42. The second valve 44 is installed on the connecting pipe 41 and is located between the second post-pump discharge valve 34 and the connecting valve 42.

[0054] By setting up valves, the priming process of the running pump to the standby pump can be precisely controlled, avoiding cavitation or other failures caused by improper priming, and facilitating system maintenance and management.

[0055] Another aspect of the present application provides an air-cooled condenser system, which includes the above-mentioned cavitation-proof drainage device. By integrating the cavitation-proof drainage device into the air-cooled condenser system, not only the cavitation problem during the start-up of the drainage pump is effectively solved, the running efficiency and reliability of the pump are improved, the maintenance cost is reduced, but also the overall performance of the system is further enhanced, and the operation risk is reduced. In addition, the wide application of this device can effectively improve the running efficiency of industrial systems, reduce energy waste, and reduce environmental pollution.

[0056] In practical applications, the device can also be customized according to specific requirements, such as adding remote control functions, automatic detection and alarm systems, etc., to adapt to more complex and stricter working environments and operation requirements, providing a strong guarantee for the efficient and safe operation of industrial systems.

[0057] The operation instructions of the above-mentioned cavitation-proof drainage device are as follows:

[0058] 1. When the standby pump is under maintenance, confirm that the inlet valve, pump outlet valve, pre-pump vent valve, and post-pump discharge valve corresponding to the standby pump are all closed.

[0059] 2. After the standby pump maintenance is completed and before ending standby, confirm that the pre-pump vent valve of the operating pump is closed.

[0060] 3. Slowly open the connection valve between the standby pump and the operating pump to fill the standby pump with liquid, and pay attention to monitoring whether the pressure of the operating pump is normal.

[0061] 4. Open the pre-pump drain valve of the standby pump. After confirming that water continuously flows out of the pre-pump drain valve, close the pre-pump drain valve and the connection valve.

[0062] 5. Slowly open the pre-pump vent valve of the standby pump, closely monitor that the pressure of the operating pump does not drop. If the pressure drops, immediately slowly close the pre-pump vent valve of the standby pump. After the pressure rebounds and stabilizes, and after troubleshooting and finding no problems, perform the valve opening operation again.

[0063] 6. Slowly open the inlet valve and pump outlet valve of the standby pump, and pay attention to monitoring that the pressure of the operating pump is normal.

[0064] 7. After the standby pump is in normal standby, slowly open the pre-pump vent valve of the operating pump.

[0065] This solution uses a connecting pipe, a connection valve, etc. to solve the problems of cavitation of the condensate pump in a vacuum environment, both pumps being unable to operate, condensate rising leading to the interruption of production of the device, a large amount of raw materials being consumed during startup and shutdown, and damage to equipment after the condensate floods the steam turbine cylinder due to failure to stop in time, improving the operating safety benefit and maintaining the safe, long-term and stable operation of the device.

[0066] The above are only optional embodiments of this solution and are not used to limit this solution. For those skilled in the art, this solution can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this solution shall be included within the protection scope of this solution.

[0067] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0068] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of this solution. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: Similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0069] In the description of this solution, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc., are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing this solution and simplifying the description. Without contrary instructions, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of this solution; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0070] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc., can be used here to describe the spatial positional relationships between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding interpretations of the spatial relative descriptions used here will be made.

[0071] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings. Therefore, it cannot be understood as a limitation on the protection scope of this solution.

Claims

1. A cavitation-proof drainage device, characterized in that, It includes an input main pipe (11), a first branch pipe (12), a second branch pipe (13), an output main pipe (14), a first drain pump (21), a second drain pump (22), a first pre-pump exhaust valve (31), a second pre-pump exhaust valve (32), a first post-pump discharge valve (33), a second post-pump discharge valve (34), a connecting pipe (41) and a connecting valve (42); one end of the first branch pipe (12) is connected to the input main pipe (11), the other end of the first branch pipe (12) is connected to the output main pipe (14), one end of the second branch pipe (13) is connected to the input main pipe (11), and the other end of the second branch pipe (13) is connected to the output main pipe (14); the first drain pump (21) is installed on the first branch pipe (12), the second drain pump (22) is installed on the second branch pipe (13), the first pre-pump exhaust valve (31) is installed on the first branch pipe (12) and is located between the input main pipe (11) and the first drain pump (21), the second pre-pump exhaust valve (32) is installed on the second branch pipe (13) and is located between the input main pipe (11) and the second drain pump (22), the first post-pump discharge valve (33) is installed on the first branch pipe (12) and is located between the first drain pump (21) and the output main pipe (14), the second post-pump discharge valve (34) is installed on the second branch pipe (13) and is located between the second drain pump (22) and the output main pipe (14), one end of the connecting pipe (41) is connected to the first post-pump discharge valve (33), the other end of the connecting pipe (41) is connected to the second post-pump discharge valve (34), and the connecting valve (42) is installed on the connecting pipe (41); wherein, one of the first drain pump (21) and the second drain pump (22) serves as the operating pump, and the other serves as the standby pump, and the operating pump can fill the standby pump through the connecting pipe (41).

2. The anti-cavitation steam trap device according to claim 1, characterized in that, The anti-cavitation drain device further includes a first pre-pump drain valve (51) and a second pre-pump drain valve (52), the first pre-pump drain valve (51) is installed on the first branch pipe (12) and is located between the input main pipe (11) and the first pre-pump exhaust valve (31), the second pre-pump drain valve (52) is installed on the second branch pipe (13) and is located between the input main pipe (11) and the second pre-pump exhaust valve (32), the first pre-pump drain valve (51) is used for draining water when the first drain pump (21) is being repaired, and the second pre-pump drain valve (52) is used for draining water when the second drain pump (22) is being repaired.

3. The anti-cavitation steam trap device according to claim 2, characterized in that, The anti-cavitation drainage device further includes a first inlet valve (61) and a second inlet valve (62). The first inlet valve (61) is installed on the first branch pipe (12) and is located between the input main pipe (11) and the first drain valve in front of the first pump (51). The second inlet valve (62) is installed on the second branch pipe (13) and is located between the input main pipe (11) and the second drain valve in front of the second pump (52). The first inlet valve (61) is used to hand over the first drain pump (21) to isolate condensate when maintaining the first drain pump (21). The second inlet valve (62) is used to hand over the second drain pump (22) to isolate condensate when maintaining the second drain pump (22).

4. The anti-cavitation steam trap device according to claim 2, characterized in that, The anti-cavitation drainage device further includes a first filter (71) and a second filter (72). The first filter (71) is installed on the first branch pipe (12) and is located between the first exhaust valve in front of the first pump (31) and the first drain valve in front of the first pump (51). The second filter (72) is installed on the second branch pipe (13) and is located between the second exhaust valve in front of the second pump (32) and the second drain valve in front of the second pump (52). The first filter (71) is used to prevent debris from entering the first drain pump (21). The second filter (72) is used to prevent debris from entering the second drain pump (22).

5. The anti-cavitation steam trap device according to claim 1, wherein The anti-cavitation drainage device further includes a discharge pipe (15). The first exhaust valve in front of the first pump (31) and the second exhaust valve in front of the second pump (32) are respectively connected to the discharge pipe (15).

6. The anti-cavitation steam trap device according to claim 5, characterized in that, The inlet of the input main pipe (11) is connected to a drainage tank, and the outlet of the discharge pipe (15) is connected to the drainage tank.

7. The anti-cavitation steam trap device according to claim 1, wherein, The anti-cavitation drainage device further includes a first check valve at the pump outlet (81) and a second check valve at the pump outlet (82). The first check valve at the pump outlet (81) is installed on the first branch pipe (12) and is located between the first drain pump (21) and the output main pipe (14). The second check valve at the pump outlet (82) is installed on the second branch pipe (13) and is located between the second drain pump (22) and the output main pipe (14). The first check valve at the pump outlet (81) and the second check valve at the pump outlet (82) are used to prevent fluid backflow.

8. The anti-cavitation steam trap device according to claim 1, characterized in that, The anti-cavitation drainage device further includes a first pump outlet valve (91) and a second pump outlet valve (92). The first pump outlet valve (91) is installed on the first branch pipe (12) and is located between the first drain pump (21) and the output main pipe (14). The second pump outlet valve (92) is installed on the second branch pipe (13) and is located between the second drain pump (22) and the output main pipe (14). The first pump outlet valve (91) is used to hand over the first drain pump (21) to isolate condensate when maintaining the first drain pump (21). The second pump outlet valve (92) is used to hand over the second drain pump (22) to isolate condensate when maintaining the second drain pump (22).

9. The anti-cavitation steam trap device according to claim 1, wherein The anti-cavitation drainage device further includes a first valve (43) and a second valve (44). The first valve (43) is installed on the connecting pipe (41) and is located between the first post-pump discharge valve (33) and the connecting valve (42). The second valve (44) is installed on the connecting pipe (41) and is located between the second post-pump discharge valve (34) and the connecting valve (42).

10. An air-cooled condenser system, characterized in that, The air-cooled condenser system includes the anti-cavitation drainage device according to any one of claims 1 to 9.

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