Cavitation-resistant condensate pump, cavitation-resistant condensate pump control method and control system

Abstract

The present invention provides an anti-cavitation condensate pump, an anti-cavitation condensate pump control method and a control system. The anti-cavitation condensate pump includes: a volute; a diameter-adjustable pipe is installed at the water inlet end of the volute; a water pressure sensor is installed at least at the inlet of the diameter-adjustable pipe, the impeller inlet of the volute and the water outlet end of the volute, and is used to obtain water pressure measurement data, wherein the water pressure measurement data is used to generate an adjustment instruction; a driving device, which is connected to the diameter-adjustable pipe and is used to adjust the diameter of the diameter-adjustable pipe according to the adjustment instruction. The anti-cavitation condensate pump, the anti-cavitation condensate pump control method and the control system provided by the present invention obtain water pressure measurement data, that is, the operating conditions of the condensate pump, through the water pressure sensor, obtain an adjustment instruction for various operating condition information, and adjust the diameter of the diameter-adjustable pipe according to the adjustment instruction, so that the condensate pump meets the anti-cavitation performance requirements under the corresponding operating conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of condensate pumps, and in particular, to an anti-cavitation condensate pump, an anti-cavitation condensate pump control method, and a control system. Background Art

[0002] Condensate pumps belong to typical centrifugal pump equipment and are one of the core transport equipment for the steam-water cycle in a ship power system. They are responsible for drawing condensate from the deaerator tank of the condenser and delivering it to the feed water system after pressurization. In the prior art, methods such as optimizing the impeller structure and selecting cavitation-resistant materials are used to improve the cavitation resistance performance of condensate pumps. However, in the face of the complex operation process of the ship power system, condensate pumps often fail to meet the cavitation resistance performance requirements under various working conditions. Summary of the Invention

[0003] The present invention provides an anti-cavitation condensate pump, an anti-cavitation condensate pump control method, and a control system to solve the defect that the cavitation resistance performance requirements under various working conditions cannot be met by methods such as optimizing the impeller structure and selecting cavitation-resistant materials in the prior art.

[0004] The present invention provides an anti-cavitation condensate pump, comprising:

[0005] A volute;

[0006] A diameter-adjustable pipe installed at the water inlet end of the volute;

[0007] A water pressure sensor installed at least at the inlet of the diameter-adjustable pipe, the impeller inlet of the volute, and the water outlet end of the volute, for obtaining water pressure measurement data, wherein the water pressure measurement data is used to generate an adjustment instruction;

[0008] A driving device connected to the diameter-adjustable pipe for adjusting the diameter of the diameter-adjustable pipe according to the adjustment instruction.

[0009] According to the anti-cavitation condensate pump provided by the present invention, the diameter-adjustable pipe includes a plurality of corrugated pipes and a plurality of arc pipes, and the corrugated pipes and the arc pipes are alternately fixedly connected.

[0010] According to the anti-cavitation condensate pump provided by the present invention, the diameter-adjustable pipe further includes a fixed annular limiter and an adjustable annular limiter. The fixed annular limiter is arranged outside the inlet end of the diameter-adjustable pipe, and the adjustable annular limiter is arranged outside the outlet end of the diameter-adjustable pipe.

[0011] According to the anti-cavitation condensate pump provided by the present invention, a hook is provided on the arc pipe, and the adjustable annular limiter includes an annular bracket, a fixed pulley, and a steel cable. The fixed pulley is fixed on the annular bracket, and the steel cable passes through the hook and the fixed pulley.

[0012] An anti-cavitation condensate pump provided by the present invention further includes:

[0013] A controller, configured to obtain the pump head according to the water pressure measurement data at the inlet of the diameter-adjustable pipeline and the water pressure measurement data at the water outlet end of the volute, and obtain an adjustment instruction according to the pump head.

[0014] For an anti-cavitation condensate pump provided by the present invention, the controller is further configured to determine the minimum value of the pump head according to the water pressure measurement data at the impeller inlet of the volute, and obtain an adjustment instruction according to the pump head and the minimum value of the pump head.

[0015] For an anti-cavitation condensate pump provided by the present invention, obtaining the adjustment instruction according to the pump head and the minimum value of the pump head includes:

[0016] If the pump head is not lower than the minimum value of the pump head, obtain an adjustment instruction to increase the diameter of the diameter-adjustable pipeline;

[0017] If the pump head is lower than the minimum value of the pump head, obtain an adjustment instruction to decrease the diameter of the diameter-adjustable pipeline.

[0018] For an anti-cavitation condensate pump provided by the present invention, obtaining the adjustment instruction according to the pump head and the minimum value of the pump head includes:

[0019] Set several gears for the driving device, the gears are from low to high, and each gear corresponds to the adjusted diameter of the diameter-adjustable pipeline;

[0020] If the pump head is not lower than the minimum value of the pump head, obtain an adjustment instruction to sequentially adjust the driving device from the current gear to a higher gear;

[0021] If the pump head is lower than the minimum value of the pump head, obtain an adjustment instruction to sequentially adjust the driving device from the current gear to a lower gear.

[0022] The present invention also provides an anti-cavitation condensate pump control method, including:

[0023] Obtain the water pressure measurement data at the inlet of the diameter-adjustable pipeline, the water pressure measurement data at the impeller inlet of the volute, and the water pressure measurement data at the water outlet end of the volute;

[0024] Obtain an adjustment instruction according to the water pressure measurement data;

[0025] Send the adjustment instruction to the driving device to complete the control of the condensate pump.

[0026] The present invention also provides an anti-cavitation condensate pump control system, including:

[0027] An acquisition module, configured to acquire the water pressure measurement data at the inlet of the diameter-adjustable pipeline, the water pressure measurement data at the impeller inlet of the volute, and the water pressure measurement data at the water outlet end of the volute;

[0028] A generation module, configured to obtain an adjustment instruction according to the water pressure measurement data;

[0029] A sending module, configured to transmit the adjustment instruction to the driving device to complete the control of the condensate pump.

[0030] The anti-cavitation condensate pump, anti-cavitation condensate pump control method and control system provided by the present invention obtain water pressure measurement data, that is, the operating conditions of the condensate pump, through a water pressure sensor. For various operating condition information, an adjustment instruction is obtained, and the diameter of the diameter-adjustable pipeline is adjusted according to the adjustment instruction, so that the condensate pump meets the anti-cavitation performance requirements under the corresponding operating conditions. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0032] Figure 1 is a schematic structural diagram of the anti-cavitation condensate pump provided by the present invention;

[0033] Figure 2 is a schematic cross-sectional structure diagram of the diameter-adjustable pipeline;

[0034] Figure 3 is a schematic cross-sectional structure diagram of the fixed annular limiter;

[0035] Figure 4 is a schematic cross-sectional structure diagram of the adjustable annular limiter;

[0036] Figure 5 is a schematic flow chart of a control method for an anti-cavitation condensate pump provided by the present invention;

[0037] Figure 6 is a schematic structural diagram of an anti-cavitation condensate pump control system provided by the present invention.

[0038] Reference Signs:

[0039] 110: volute; 120: diameter-adjustable pipe; 121: corrugated pipe; 122: arc pipe; 1221: hook; 130: water pressure sensor; 140: drive device; 150: fixed annular limiter; 151: welding point; 160: adjustable annular limiter; 161: annular bracket; 162: fixed pulley; 163: steel cable; 170: elastic rubber ring. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0041] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0043] In the embodiments of the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0044] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0045] Figure 1 is a schematic structural diagram of the anti-cavitation condensate pump provided by the present invention. Referring to Figure 1 the present invention provides an anti-cavitation condensate pump, including:

[0046] A volute 110; an impeller is provided inside the volute 110.

[0047] A diameter-adjustable pipe 120, installed at the water inlet end of the volute 110;

[0048] A water pressure sensor 130, installed at least at the inlet of the diameter-adjustable pipe 120, the impeller inlet of the volute 110, and the water outlet end of the volute 110, for obtaining water pressure measurement data, wherein the water pressure measurement data is used to generate an adjustment instruction;

[0049] A driving device 140, connected to the diameter-adjustable pipe 120, for adjusting the diameter of the diameter-adjustable pipe according to the adjustment instruction.

[0050] For the diameter-adjustable pipe 120, increasing the diameter of its end can reduce the absolute movement speed of the liquid and improve the anti-cavitation performance of the condensate pump.

[0051] For the driving device 140, it includes a stepping motor, and the stepping motor is used to adjust the diameter of the diameter-adjustable pipe 120.

[0052] It can be understood that this application obtains water pressure measurement data, that is, the operating conditions of the condensate pump, through the water pressure sensor 130, obtains an adjustment instruction for various operating condition information, and adjusts the diameter of the diameter-adjustable pipe 120 according to the adjustment instruction, so that the condensate pump meets the anti-cavitation performance requirements under the corresponding operating conditions.

[0053] On the basis of the above embodiments, as an optional embodiment, such as Figure 2As shown, the diameter-adjustable pipe 120 includes a plurality of corrugated pipes 121 and a plurality of arc pipes 122, and the corrugated pipes 121 and the arc pipes 122 are alternately fixedly connected. Specifically, both the corrugated pipes 121 and the arc pipes 122 are made of metal and can be alternately welded to form an elastic tube structure.

[0054] Optionally, the diameter-adjustable pipe 120 is connected to the volute 110 through an elastic rubber ring 170.

[0055] Optionally, the diameter-adjustable pipe 120 further includes a fixed annular limiter 150 and an adjustable annular limiter 160. The fixed annular limiter 150 is provided outside the inlet end of the diameter-adjustable pipe 120, and the adjustable annular limiter 160 is provided outside the outlet end of the diameter-adjustable pipe 120.

[0056] As Figure 3 shown, the diameter of the fixed annular limiter 150 is d, and the material is steel. Its fixed diameter d is generally the same as the diameter of the pipe connected to the inlet section of the condensate pump. The inlet section of the condensate pump is the diameter-adjustable pipe. The fixed annular limiter 150 is fixedly welded to the arc pipe 122 through a welding point 151.

[0057] Optionally, as Figure 4 shown, a hook 1221 is provided on the arc pipe 122. The adjustable annular limiter 160 includes an annular bracket 161, a fixed pulley 162, and a steel cable 163. The fixed pulley 162 is fixed on the annular bracket 161, and the steel cable 163 passes through the hook 1221 and the fixed pulley 162.

[0058] A metal hook 1221 is welded to each metal smooth pipe of the diameter-adjustable pipe 120. An annular bracket 161 with a diameter of D (D > d) is deployed outside the diameter-adjustable pipe. A fixed pulley 162 is welded at the position of the annular bracket 161 corresponding to each metal hook 1221. The metal hooks 1221 and the fixed pulleys 162 are connected by a steel cable 163 and connected to a stepping motor. Finally, the diameter of the diameter-adjustable pipe 120 is adjusted by adjusting the gear of the stepping motor.

[0059] It can be understood that the present application proposes a structural solution for a diameter-adjustable pipe 1120 so that the driving device 140 can adjust the end diameter of the diameter-adjustable pipe 120 to adjust the anti-cavitation performance of the condensate pump.

[0060] Based on the above embodiments, as an alternative embodiment, the adjustable annular limiter 160 includes an elastic band. One end of the elastic band is provided with an opening, and the other end passes through the opening and is connected to the driving device. When the driving device rotates forward, the diameter of the diameter-adjustable pipe is reduced, and when the driving device rotates in reverse, the diameter of the diameter-adjustable pipe is increased.

[0061] It can be understood that the present application proposes another structural solution for the adjustable annular limiter 160. The driving device can adjust the end diameter of the diameter-adjustable pipe so as to adjust the anti-cavitation performance of the condensate pump.

[0062] Based on the above embodiments, as an alternative embodiment, the end of the diameter-adjustable pipe 120 is a structure that can axially expand and contract. The diameter of this structure gradually increases from the front end to the end. The driving device 140 adjusts the diameter by driving the end of the diameter-adjustable pipe to axially expand and contract.

[0063] It can be understood that the present application proposes another structural solution for the diameter-adjustable pipe 120. The driving device 140 can adjust the end diameter of the diameter-adjustable pipe 120 so as to adjust the anti-cavitation performance of the condensate pump.

[0064] Based on the above embodiments, as an alternative embodiment, it further includes:

[0065] A controller (not shown in the figure), which is used to obtain the pump head according to the water pressure measurement data at the inlet of the diameter-adjustable pipe 120 and the water pressure measurement data at the water outlet end of the volute 110, and obtain an adjustment instruction according to the pump head. Specifically, an industrial controller can be used as the controller.

[0066] During the adjustment process of the condensate pump, it is necessary to ensure that the water pumping function of the pump meets the system requirements. Generally, the pump head of the condensate pump is used to characterize the water pumping function. A water pressure sensor 130 is deployed at the front end of the inlet section and the end of the outlet section respectively to monitor the water pressure at the front end of the inlet section and the end of the outlet section in real time, and transmit the monitoring signal to the industrial computer to calculate the pump head H of the pump in real time and store it.

[0067] Among them, the calculation process of the pump head H is as follows: At a certain moment, the water pressure signals of the water pressure sensors 130 at the front end of the inlet section and the end of the outlet section are P in 、P out , then the pump head monitored at this moment:

[0068]

[0069] Among them, P in 、P outThey represent the water pressure measured at the front of the inlet section and the end of the outlet section, ρ is the density of the liquid conveyed in the centrifugal pump, and g represents the acceleration due to gravity.

[0070] Therefore, the pump head H can represent the water-drawing capacity of the condensate pump. The larger H is, the stronger the water-drawing capacity of the condensate pump is.

[0071] Optionally, the controller is further configured to determine a minimum pump head value based on water pressure measurement data at an impeller inlet of the volute 110 , and obtain an adjustment instruction based on the pump head and the minimum pump head value.

[0072] From the process of cavitation in the condensate pump, it can be seen that the liquid flows from the inlet of the condensate pump through the flow channel to the outlet. As the impeller does work, its energy continues to increase. The lowest pressure point in the flow channel of the condensate pump is usually located near the blade inlet. At this point, due to the change in the flow channel, the corresponding relative speed is large, and the pressure also increases accordingly. If it is lower than the critical vaporization pressure of the liquid being transported, cavitation will occur, damaging the condensate pump and affecting its working performance.

[0073] Therefore, k water pressure sensors 130 are installed at the impeller inlet, and an industrial computer is deployed in the compartment where the condensate pump is located to monitor the pressure at the impeller inlet in real time. The monitoring signal is transmitted to the industrial computer, and the minimum water pressure P at the impeller inlet is obtained by comparison and stored.

[0074] The calculation process of the minimum water pressure P at the impeller inlet is as follows: at a certain moment, the water pressure signals monitored by k water pressure sensors are P(1), P(2)…P(k), and there are k data. The minimum water pressure at the impeller inlet monitored at this moment is:

[0075]

[0076] Therefore, the minimum water pressure P at the impeller inlet can characterize the anti-cavitation performance of the condensate pump. The larger P is, the better the anti-cavitation performance of the condensate pump.

[0077] Generally speaking, increasing the diameter of the inlet section end can reduce the absolute movement speed of the liquid and improve the anti-cavitation performance of the pump. However, if the inlet section diameter is too large, it will destroy the smoothness and stability of the flow, reduce the head of the condensate pump, and make it difficult to meet the system operation function requirements.

[0078] Therefore, when adjusting the diameter-adjustable pipe 120, it is necessary to consider both the anti-cavitation performance and the water-drawing capacity of the condensate pump, that is, it is necessary to consider both the minimum water pressure P at the impeller inlet and the pump head H. Generally, for the condensate pump, it is necessary to set the minimum head requirement H according to the water-drawing demand of the system. min , and stored in the industrial computer.

[0079] That is to say, on the one hand, from the perspective of the anti-cavitation requirement of the condensate pump, the larger the diameter of the end of the inlet section, the higher the minimum water pressure P at the impeller inlet, and the stronger the anti-cavitation performance of the condensate pump; on the other hand, the larger the diameter of the end of the inlet section, the lower the head of the condensate pump will be, and the weaker the water pumping capacity of the condensate pump.

[0080] Optionally, obtaining an adjustment instruction according to the pump head and the minimum value of the pump head includes:

[0081] If the pump head is not lower than the minimum value of the pump head, obtain an adjustment instruction to increase the diameter of the diameter-adjustable pipeline;

[0082] If the pump head is lower than the minimum value of the pump head, obtain an adjustment instruction to decrease the diameter of the diameter-adjustable pipeline.

[0083] The present invention needs to adjust the diameter of the end of the optimal pump inlet section to ensure that the condensate pump meets the dual performance of anti-cavitation and water pumping.

[0084] Optionally, obtaining an adjustment instruction according to the pump head and the minimum value of the pump head includes:

[0085] Set several gears for the driving device, the gears are from low to high, and each gear corresponds to the adjusted diameter of the diameter-adjustable pipeline;

[0086] If the pump head is not lower than the minimum value of the pump head, obtain an adjustment instruction to sequentially adjust the driving device from the current gear to a higher gear;

[0087] If the pump head is lower than the minimum value of the pump head, obtain an adjustment instruction to sequentially adjust the driving device from the current gear to a lower gear.

[0088] Suppose the stepping motor is set with n gears, which correspond to n adjusted diameters of the end of the condensate pump inlet section from small to large: R1, R2, R3…R n . Therefore, by adjusting the gears of the stepping motor, the diameter of the end of the condensate pump inlet section is changed. The higher the gear of the stepping motor, the larger the diameter of the end of the condensate pump inlet section.

[0089] When the condensate pump is running, the industrial control computer will compare and analyze the real-time monitored pump head H with the minimum head requirement H min : When H≥H min , it indicates that the diameter setting of the end of the current condensate pump inlet section meets the water pumping capacity requirement of the condensate pump. Then, the stepping stretching motor will be sequentially adjusted from the current gear to a higher gear, and ensure that the pump head H≥H min after each adjustment, otherwise stop adjusting to a higher gear; when H<H minWhen it indicates that the diameter setting at the end of the current condensate pump inlet section cannot meet the water intake capacity requirement of the condensate pump, the stepping stretching motor is adjusted successively from the current gear to lower gears until the pump head H≥H min , then stop adjusting to lower gears.

[0090] It can be understood that after each change in the operating conditions of the condensate pump, the stepping motor of the diameter-adjustable pipeline can be adjusted to the appropriate gear according to the above steps to achieve the optimal diameter setting at the end of the condensate pump inlet section, which can not only improve the cavitation resistance performance of the condensate pump but also take into account the water intake capacity requirement of the condensate pump.

[0091] As Figure 5 shown, the present invention also provides a cavitation-resistant condensate pump control method, including:

[0092] S510, obtaining the water pressure measurement data at the inlet of the diameter-adjustable pipeline, the water pressure measurement data at the impeller inlet of the volute, and the water pressure measurement data at the water outlet end of the volute.

[0093] S520, obtaining an adjustment instruction according to the water pressure measurement data.

[0094] S530, sending the adjustment instruction to the driving device to complete the control of the condensate pump.

[0095] Next, the condensate pump control system provided by the present invention will be described. The condensate pump control system described below can be mutually referred to the condensate pump control method described above.

[0096] As Figure 6 shown, the present invention also provides a cavitation-resistant condensate pump control system, including:

[0097] An acquisition module 610, configured to acquire the water pressure measurement data at the inlet of the diameter-adjustable pipeline, the water pressure measurement data at the impeller inlet of the volute, and the water pressure measurement data at the water outlet end of the volute.

[0098] A generation module 620, configured to obtain an adjustment instruction according to the water pressure measurement data.

[0099] A sending module 630, configured to transmit the adjustment instruction to the driving device to complete the control of the condensate pump.

[0100] As an embodiment, the generation module 620 is configured to obtain the pump head according to the water pressure measurement data at the inlet of the diameter-adjustable pipeline and the water pressure measurement data at the water outlet end of the volute, and obtain an adjustment instruction according to the pump head.

[0101] As an embodiment, the generating module 620 is further configured to determine the minimum value of the pump head according to the water pressure measurement data at the impeller inlet of the volute, and obtain an adjustment instruction according to the pump head and the minimum value of the pump head.

[0102] As an embodiment, the generating module 620 is further configured to:

[0103] If the pump head is not lower than the minimum value of the pump head, obtain an adjustment instruction to increase the diameter of the diameter-adjustable pipeline;

[0104] If the pump head is lower than the minimum value of the pump head, obtain an adjustment instruction to decrease the diameter of the diameter-adjustable pipeline.

[0105] As an embodiment, the generating module 620 is further configured to:

[0106] Set a number of gears for the driving device, the gears are from low to high, and each gear corresponds to an adjusted diameter of the diameter-adjustable pipeline;

[0107] If the pump head is not lower than the minimum value of the pump head, obtain an adjustment instruction to sequentially adjust the driving device from the current gear to a higher gear;

[0108] If the pump head is lower than the minimum value of the pump head, obtain an adjustment instruction to sequentially adjust the driving device from the current gear to a lower gear.

[0109] The condensate pump, the condensate pump control method and the control system provided by the present invention obtain water pressure measurement data, that is, the operating conditions of the condensate pump, through a water pressure sensor. For various operating condition information, an adjustment instruction is obtained, and the diameter of the diameter-adjustable pipeline is adjusted according to the adjustment instruction, so that the condensate pump meets the anti-cavitation performance requirements under the corresponding operating conditions.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cavitation-resistant condensate pump, characterized in that, Comprising: Volute; A diameter-adjustable pipe installed at the water inlet end of the volute; Increasing the end diameter of the diameter-adjustable pipe; A water pressure sensor installed at least at the inlet of the diameter-adjustable pipe, the impeller inlet of the volute, and the water outlet end of the volute, for obtaining water pressure measurement data, wherein the water pressure measurement data is used to generate an adjustment instruction; A driving device connected to the diameter-adjustable pipe for adjusting the diameter of the diameter-adjustable pipe according to the adjustment instruction; A controller for obtaining the pump head according to the water pressure measurement data at the inlet of the diameter-adjustable pipe and the water pressure measurement data at the water outlet end of the volute, and obtaining an adjustment instruction according to the pump head; the controller is further used to determine the minimum value of the pump head according to the water pressure measurement data at the impeller inlet of the volute, and obtain an adjustment instruction according to the pump head and the minimum value of the pump head.

2. The anti-cavitation condensate pump according to claim 1, characterized in that The diameter-adjustable pipe includes a plurality of corrugated pipes and a plurality of arc pipes, and the corrugated pipes and the arc pipes are alternately fixedly connected.

3. The anti-cavitation condensate pump according to claim 2, characterized in that, The diameter-adjustable pipe further includes a fixed annular limiter and an adjustable annular limiter, the fixed annular limiter is arranged outside the inlet end of the diameter-adjustable pipe, and the adjustable annular limiter is arranged outside the outlet end of the diameter-adjustable pipe.

4. The anti-cavitation condensate pump according to claim 3, characterized in that, Hooks are arranged on the arc pipe, and the adjustable annular limiter includes an annular bracket, a fixed pulley, and a steel cable, the fixed pulley is fixed on the annular bracket, and the steel cable passes through the hook and the fixed pulley.

5. The anti-cavitation condensate pump according to claim 1, characterized in that, The obtaining the adjustment instruction according to the pump head and the minimum value of the pump head includes: If the pump head is not lower than the minimum value of the pump head, obtaining an adjustment instruction to increase the diameter of the diameter-adjustable pipe; If the pump head is lower than the minimum value of the pump head, obtaining an adjustment instruction to decrease the diameter of the diameter-adjustable pipe.

6. The anti-cavitation condensate pump according to claim 1, characterized in that, The obtaining the adjustment instruction according to the pump head and the minimum value of the pump head includes: Setting a plurality of gears for the driving device, the gears are from low to high, and each gear corresponds to the adjusted diameter of the diameter-adjustable pipe; If the pump head is not lower than the minimum value of the pump head, obtaining an adjustment instruction to sequentially adjust the driving device from the current gear to a higher gear; If the pump head is lower than the minimum value of the pump head, obtaining an adjustment instruction to sequentially adjust the driving device from the current gear to a lower gear.

7. A cavitation-resistant condensate pump control method, characterized in that, Applicable to the anti-cavitation condensate pump according to any one of claims 1-6, including: Obtaining the water pressure measurement data at the inlet of the diameter-adjustable pipe, the water pressure measurement data at the impeller inlet of the volute, and the water pressure measurement data at the water outlet end of the volute; Obtaining an adjustment instruction according to the water pressure measurement data; Sending the adjustment instruction to the driving device to complete the control of the condensate pump.

8. A cavitation-resistant condensate pump control system, characterized in that, Implemented based on the anti-cavitation condensate pump according to any one of claims 1-6, including: An acquisition module for obtaining the water pressure measurement data at the inlet of the diameter-adjustable pipe, the water pressure measurement data at the impeller inlet of the volute, and the water pressure measurement data at the water outlet end of the volute; A generation module for obtaining an adjustment instruction according to the water pressure measurement data; A sending module, configured to transmit the adjustment instruction to the driving device to complete the control of the condensate pump.

Images