A water self-cooling system with integrated water pump and electricity

Abstract

The present invention relates to a water pump electrical integrated water self-cooling system, comprising a water pump, an AC motor and a frequency converter. The AC motor is connected to the water pump, and the AC motor can drive the water pump impeller to rotate when it works, so as to drive the water pump to pump water from a low place to a high place. The frequency converter is electrically connected to the AC motor and is used to adjust the speed of the AC motor. A heat dissipation structure is also provided in the frequency converter, and one end of the heat dissipation structure is connected to the bypass of the water pump outlet through a heat dissipation water inlet pipe, and the other end is connected to the water inlet of the water pump through a heat dissipation water return pipe. By utilizing the pressure difference between the water pump outlet and the water inlet, the water at the water pump outlet enters the heat dissipation structure of the frequency converter through the heat dissipation water inlet pipe, and then flows back to the water pump inlet through the heat dissipation water return pipe. Water circulates in the heat dissipation structure to cool the frequency converter, and no additional heat dissipation equipment is required. The heat dissipation effect required by the frequency converter can be achieved by only using the pressure difference between the water pump inlet and outlet to drive the water flow, which greatly reduces the volume of the frequency converter and reduces the cost.

Description

Technical Field

[0001] The invention relates to the technical field of frequency converter heat dissipation, and in particular to a water pump and electrical integrated water self-cooling system. Background Art

[0002] At present, building water supply mostly adopts variable frequency constant pressure water supply. The water pump is directly connected to the water pipe network or underground well pipe. The speed of the water pump motor is controlled by the inverter to maintain a constant water pressure for stable water supply. The secondary voltage conversion of water supply is realized on the basis of making full use of the original pressure of the water pipe network. However, the inverter of the water pump generates a certain amount of heat when working, which needs to be dissipated in time to ensure the normal operation of the inverter.

[0003] The heat dissipation of the inverter includes air cooling, heat pipe cooling, water cooling and other methods. Compared with the other two methods, water cooling uses better heat conduction technology, which greatly reduces the size of the inverter radiator, has higher heat dissipation efficiency and better performance. However, water cooling currently requires an additional set of water circulation equipment in the water pump, that is, an additional set of water circulation control system is required to meet the heat dissipation requirements, resulting in the inverter equipment being larger in size, inconvenient to install, and high in cost. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a water pump and electrical integrated water self-cooling system, which solves the problem in the prior art that additional water circulation equipment is required to dissipate heat from the inverter, resulting in large inverter size and high cost.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the present invention provides a water pump and electrical integrated water self-cooling system, and the specific technical scheme is as follows:

[0008] A water pump and electrical integrated water self-cooling system, comprising:

[0009] Water pump;

[0010] An AC motor is connected to the water pump, and the AC motor can drive the water pump impeller to rotate;

[0011] A frequency converter, electrically connected to the AC motor, for adjusting the speed of the AC motor;

[0012] A heat dissipation structure is also provided in the frequency converter, one end of the heat dissipation structure is connected to the bypass of the water outlet of the water pump through a heat dissipation water inlet pipe, and the other end is connected to the water inlet of the water pump through a heat dissipation water return pipe.

[0013] Furthermore, the frequency converter further comprises:

[0014] An electrical module electrically connected to the AC motor;

[0015] A substrate, the electrical module is arranged on the upper end surface of the substrate, and the heat dissipation structure is arranged on the lower end surface of the substrate;

[0016] The housing, the electrical module, the substrate and the heat dissipation structure are all arranged in the housing.

[0017] Furthermore, the heat dissipation structure is a water-cooled plate, and the heat dissipation water inlet pipe and the heat dissipation water return pipe are connected to both sides of the water-cooled plate.

[0018] Furthermore, thermal grease is coated between the water cooling plate and the base plate.

[0019] Furthermore, the water inlet of the water pump is provided with a water inlet pipe, and the water outlet is provided with a water outlet pipe;

[0020] The heat dissipation water inlet pipe is connected to the side wall of the water outlet pipe, and the heat dissipation water outlet pipe is connected to the water inlet pipe.

[0021] Furthermore, the heat dissipation water inlet pipe is arranged to be inclined toward the outlet end of the water outlet pipe.

[0022] Furthermore, a filter is provided on the connection side of the heat dissipation water inlet pipe and the water outlet pipe.

[0023] Further, the electrical module includes a controller, a rectifier, a filter and an inverter;

[0024] The input end of the rectifier is electrically connected to the AC power supply, the output end is electrically connected to the input end of the filter, the output end of the filter is electrically connected to the input end of the inverter, and the output end of the inverter is electrically connected to the AC motor;

[0025] The controller is electrically connected to the inverter and is used for adjusting the output voltage of the inverter.

[0026] Furthermore, a pressure sensor is provided on the water outlet pipe;

[0027] The pressure sensor is communicatively connected with the controller, and is used for detecting the outlet pressure of the water pump and transmitting the outlet pressure information to the controller. The controller adjusts the output voltage of the inverter according to the outlet pressure information.

[0028] Furthermore, the pressure sensor is arranged close to the water outlet.

[0029] (III) Beneficial effects

[0030] The water pump and electrical integrated water self-cooling system of the present invention effectively solves the shortcomings of the prior art.

[0031] In the present invention, on the basis of the original water supply system, a heat dissipation water inlet pipe and a heat dissipation water outlet pipe are arranged on both sides of the heat dissipation structure of the inverter, and the heat dissipation water inlet pipe is connected to the water outlet of the water pump, and the heat dissipation water outlet pipe is connected to the water inlet of the water pump. The pressure difference between the water outlet and the water inlet of the water pump is used to drive the water flow, and the water in the outlet pipe flows into the heat dissipation structure through the heat dissipation water inlet pipe, circulates in the heat dissipation structure, and then flows back to the water inlet of the water pump through the heat dissipation water outlet pipe. The water flow takes away the heat of the inverter and dissipates the heat of the inverter. Compared with the traditional inverter cooling method with an external heat dissipation device, the water pump electrical integrated self-cooling system provided by the present invention does not require additional heat dissipation equipment, and only uses the pressure difference between the water pump inlet and outlet to drive the water flow, so as to achieve the heat dissipation effect required by the inverter, which greatly reduces the size of the inverter and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 It is a structural schematic diagram of a water pump and electrical integrated water self-cooling system in a specific implementation manner;

[0034] Figure 2 It is a structural schematic diagram of a frequency converter in a specific implementation mode;

[0035] Figure 3 It is a structural schematic diagram of the inverter electrical module in a specific implementation manner.

[0036] [Description of Reference Numerals]

[0037] 1. Water pump; 2. AC motor;

[0038] 3. Inverter; 310. Heat dissipation structure; 320. Housing; 330. Thermal grease; 340. Base plate;

[0039] 350, electrical module; 351, rectifier; 352, filter; 353, inverter; 354, controller;

[0040] 4. Pressure sensor; 5. Water outlet pipe; 6. Filter device; 7. Heat dissipation water inlet pipe; 8. Heat dissipation water outlet pipe; 9. Water inlet pipe. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0042] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the scope of protection of this embodiment.

[0043] See also Figures 1 to 3 The present embodiment provides a water pump and electrical integrated water self-cooling system, including a water pump 1, a frequency converter 3 and an AC motor 2. The water outlet of the water pump 1 is provided with a water outlet pipe 5, and the water inlet is provided at the water inlet pipe 9. The water inlet pipe 9 is directly connected to the building water pipe network or the underground well pipe, and the water outlet pipe 5 is directly connected to the water supply demand port. The power output end of the AC motor 2 is connected to the water pump 1. The operation of the AC motor 2 can drive the impeller of the water pump 1 to rotate. The frequency converter 3 is electrically connected to the AC motor 1 to control the speed of the AC motor 2, thereby achieving the purpose of controlling the speed of the impeller of the water pump 1. Further, a heat dissipation structure 310 is provided in the frequency converter 3. A heat dissipation water inlet pipe 7 is provided on one side of the heat dissipation structure 310, and a heat dissipation water outlet pipe 8 is provided on the other side. The heat dissipation water inlet pipe 7 and the heat dissipation water outlet pipe 8 are made of stainless steel pipes or rubber pipes. Among them, the heat dissipation water inlet pipe 7 is connected to the side wall of the water outlet pipe 5, and the heat dissipation water inlet pipe 7 is inclined toward the outlet direction of the water outlet pipe 5 of the water pump 1. The inclination angle of the heat dissipation water inlet pipe 7 is related to the flow rate of water in the water outlet pipe 5 of the water pump 1 and the heat dissipation requirements of the inverter 3 in actual application. As an example, in this embodiment, the inclination angle of the heat dissipation water inlet pipe 7 is preferably 0°-75°, so that the water in the water outlet pipe 5 can flow smoothly into the heat dissipation water inlet pipe 7.

[0044] Furthermore, a filter device 6 is provided at the connection side between the heat dissipation water inlet pipe 7 and the water outlet pipe 5, for filtering impurities to prevent the impurities from entering the inverter 3 and causing blockage. As an example, in this embodiment, the filter device 6 is preferably a filter screen, which is mainly used to filter out granular impurities to prevent the impurities from clogging the heat dissipation structure 310 and affecting refrigeration.

[0045] The heat dissipation principle of the water pump and electrical integrated water self-cooling system provided in this embodiment is: utilizing the water pressure difference between the water inlet and the water outlet of the water pump 1, the water flowing out of the water outlet of the water pump 1 is introduced into the heat dissipation structure 310 through the heat dissipation water inlet pipe 7, so that the water circulates in the heat dissipation structure 310, takes away the heat of the inverter 3, and then flows back to the water inlet pipe 9 of the water pump 1 through the heat dissipation water outlet pipe 8. Based on the original water supply system, this embodiment utilizes the water pressure difference between the water inlet and the water outlet of the water pump 1 to form a water circulation, which greatly enhances the heat dissipation effect of the inverter 3, and does not require additional refrigeration equipment, thereby reducing the size of the inverter 3 and reducing the cost.

[0046] Specifically, see Figure 2 The inverter 3 includes a housing 320, and an electrical module 350, a substrate 340 and a heat dissipation structure 310 arranged in the housing 320. The electrical module 350 is arranged on the upper end surface of the substrate 340 and is electrically connected to the AC motor 2. The heat dissipation structure 310 is arranged on the lower end surface of the substrate 340. The substrate 340 is made of other good thermal conductor materials such as a copper substrate. A thermal grease 330 is coated between the substrate 340 and the heat dissipation structure 310. The thermal grease 330 transfers the heat generated by the electrical module 350 to the heat dissipation structure 310 by heat conduction for heat dissipation. Further, the housing 320 of the inverter 3 in this embodiment is a metal housing, and a plurality of circular holes are arranged on the housing 320. The AC motor 2 is correspondingly provided with threaded holes. The housing 320 is detachably mounted on the outer wall of the AC motor 2 by bolts. The inverter 3 is connected to the AC motor 2 by wires, which reduces the length of the wires and reduces the cost. When the AC motor 2 is working continuously, a certain amount of heat will be generated, and the heat can be transferred to the heat dissipation structure 310 through the shell 320 in a traditional thermal manner for dissipation.

[0047] Specifically, the heat dissipation structure 310 in this embodiment is a water-cooled plate, and the two sides of the water-cooled plate are respectively connected to the heat dissipation water inlet pipe 7 and the heat dissipation water outlet pipe 8. The water flowing out of the water outlet of the water pump 1 enters the water-cooled plate through the heat dissipation water inlet pipe 7. The water circulates in the water-cooled plate to take away the heat generated by the electrical module 350 and the AC motor 2, thereby achieving the purpose of heat dissipation. Specifically, the water-cooled plate includes two clamping plates and a circulating water pipe clamped between the two clamping plates. The circulating water pipe is spirally arranged, and the two ends are respectively connected to the heat dissipation water inlet pipe 7 and the heat dissipation water outlet pipe 8. In order to ensure the heat dissipation effect, the clamping plates and the circulating water pipes in this embodiment are made of alloy materials such as aluminum alloy. The alloy materials have good heat transfer properties, thereby ensuring the heat dissipation effect of the water-cooled plate.

[0048] See also Figure 3 The electrical module 350 in this embodiment includes a rectifier 351, a filter 352, an inverter 353 and a controller 354. The input end of the rectifier 351 is electrically connected to the external power supply, the output end of the rectifier 351 is electrically connected to the input end of the filter 352, the output end of the filter 352 is electrically connected to the input end of the inverter 353, and the output end of the inverter 353 is electrically connected to the AC motor 2. Among them, the external power supply is a single-phase or three-phase AC power of 220V / 380V, and the rectifier 351 adopts a three-phase rectifier uncontrolled bridge composed of six rectifier diodes, which is used to rectify the AC power into DC power. The filter 352 can effectively filter out the frequency point of a specific frequency in the power line or the frequency outside the frequency point to obtain a power signal of a specific frequency, or eliminate a power signal after eliminating a specific frequency. The inverter 353 is a three-phase inverter 353 composed of six IGBT tubes (insulated gate bipolar transistors) and is used to convert direct current into alternating current. Output voltages of different frequencies can be obtained through the inverter 353.

[0049] Furthermore, a pressure sensor 4 is provided on the water outlet pipe of the water pump 1. The pressure sensor 4 is provided near the water outlet of the water pump 1. The pressure sensor 4 is communicatively connected to the controller 354. The controller 354 is communicatively connected to each IGBT tube of the inverter 353. The pressure sensor 354 is used to detect the outlet pressure information of the water pump 1 and transmit the outlet pressure information to the controller 354. The controller 354 has an information processing function, converts the received outlet pressure information into a PWM signal, and transmits the PWM signal to the inverter 353. The PWM signal is used to control the switch of each IGBT tube of the inverter 353 to adjust the frequency of the output voltage of the inverter 353, drive the AC motor 2 to drive the impeller of the water pump 1 to rotate at different speeds, thereby changing the water flow rate in the water outlet pipe of the water pump 1 to achieve constant pressure water supply.

[0050] The water pump and electrical integrated water self-cooling system provided in this embodiment is specifically used by pre-filling the water pump 1 and the water inlet pipe 9 with water, controlling the AC motor 2 to start, driving the impeller of the water pump 1 to rotate, and under the action of centrifugal force, the water in the impeller flow channel is thrown to the surroundings and pressed into the volute, forming a vacuum at the impeller inlet, and is sucked along the water inlet pipe 9 under the external atmospheric pressure, and the sucked water is thrown out by the impeller and enters the water outlet pipe 5 through the volute. The impeller rotates continuously, and water can be continuously absorbed and pressed, and water can be continuously raised from a low place to a high place, so as to realize the continuous water supply at the water outlet of the water pump 1. The frequency converter 3 controls the AC motor 2 to drive the water pump 1 to rotate at different speeds, thereby changing the size of the water flow in the water outlet pipe 5 of the water pump 1, and realizing constant pressure water supply. By utilizing the pressure difference between the water outlet and the water inlet of the water pump 1, water is taken from the water outlet pipe 5 of the water pump 1 through a bypass, introduced into the inverter 3 through the heat dissipation water inlet pipe 7, and then refluxed to the water inlet of the water pump 1 through the heat dissipation water outlet pipe 8, completing the heat dissipation cycle of water flow from the water outlet of the water pump 1 - the inverter 3 - the water inlet of the water pump 1, with good heat dissipation effect.

[0051] Taking the water supply of a building as an example, the heat dissipation effect of the water pump electrical integrated water self-cooling system provided by this implementation is specifically explained through calculation:

[0052] In this embodiment, the power of the selected water pump 1 is 5KW, the corresponding power of the inverter 3 is 5KW, and the normal working efficiency of the inverter 3 is preset to be 98%, then the inverter 3 generates 2% of waste heat power, that is, the heat power generated by the inverter 3 is Q1=100W;

[0053] The water flowing into the inverter cooling structure is taken from the water pump outlet pipe, so the average volume flow rate of water in the water pump outlet pipe is V1 (m / h), and V1 is set to 0.66m 3 / h, the average volume flow rate of water in the heat dissipation water inlet pipe is V2 (m 3 / h), assuming that V2 is 1 / 100 of V1, then V2 = 0.0066m 3 / h, that is, the average water flow rate in the heat dissipation structure 310 of the inverter 3 is 0.0066m 3 / h.

[0054] For the inverter design, the inverter size is set to 400mm×200mm. For the water cooling plate, aluminum alloy and other alloy materials are selected to facilitate heat transfer. According to the following heat transfer theory and formula:

[0055] Q=ΔT*ρ*V*C P

[0056] Where Q is the heat absorbed by water, ΔT is the temperature rise of water flowing through the inverter, in °C, and ρ is the density of water, in Kg / m 3 , V is the volume flow rate of cooling water, the unit is m 3 / h, Cp is the specific heat capacity of cooling water, the unit is J / (Kg·℃).

[0057] Assuming that the temperature rise of water in a cooling cycle is ΔT is 8°C, the specific heat capacity of water Cp is 4174 J / kg°C, and the density of water at 20°C is ρ998.2 kg / m 3 , from the above V = 0.0066m 3 / h, the heat absorption power is calculated to be Q = 2.20 × 10 5 W, it can be seen that Q is much larger than the heat generation power Q1, so the heat dissipation effect is very good.

[0058] The above calculation of heat dissipation effect is only a rough estimate, and the specific value needs to be calculated according to the actual working conditions, but it can be proved that the water pump electrical integrated water self-cooling system has a good heat dissipation effect on the inverter.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which are all covered by the protection scope of the present invention.

Claims

1. A water pump and electrical integrated water self-cooling system, characterized in that: include: Water pump (1); An AC motor (2) connected to the water pump (1), wherein the AC motor (2) can drive the impeller of the water pump (1) to rotate when in operation; A frequency converter (3), electrically connected to the AC motor (2), and used to adjust the rotation speed of the AC motor (2); The frequency converter (3) is further provided with a heat dissipation structure (310), one end of the heat dissipation structure (310) being connected to the bypass of the water outlet of the water pump (1) via a heat dissipation water inlet pipe (7), and the other end of the heat dissipation structure (310) being connected to the water inlet of the water pump (1) via a heat dissipation water outlet pipe (8); The frequency converter (3) further comprises: An electrical module (350) electrically connected to the AC motor (2); The electrical module (350) includes a controller (354), a rectifier (351), a filter (352) and an inverter (353); The water inlet of the water pump (1) is provided with a water inlet pipe (9), and the water outlet is provided with a water outlet pipe (5); The heat dissipation water inlet pipe (7) is connected to the side wall of the water outlet pipe (5), and the heat dissipation water outlet pipe (8) is connected to the water inlet pipe (9); The water outlet pipe (5) is also provided with a pressure sensor (4); The pressure sensor (4) is communicatively connected to the controller (354) and is used to detect the outlet pressure of the water pump (1) and transmit the outlet pressure information to the controller (354). The controller (354) adjusts the output voltage of the inverter (353) according to the outlet pressure information.

2. The water pump and electrical integrated water self-cooling system according to claim 1, characterized in that: The frequency converter (3) further comprises: A substrate (340), the electrical module (350) being arranged on an upper end surface of the substrate (340), and the heat dissipation structure (310) being arranged on a lower end surface of the substrate (340); A housing (320), wherein the electrical module (350), the substrate (340) and the heat dissipation structure (310) are all arranged in the housing (320).

3. The water pump and electrical integrated water self-cooling system according to claim 2, characterized in that: The heat dissipation structure (310) is a water-cooled plate, and the heat dissipation water inlet pipe (7) and the heat dissipation water outlet pipe (8) are connected to two sides of the water-cooled plate.

4. The water pump and electrical integrated water self-cooling system according to claim 3, characterized in that: Thermal grease (330) is coated between the water cooling plate and the base plate (340).

5. The water pump and electrical integrated water self-cooling system according to claim 1, characterized in that: The heat dissipation water inlet pipe (7) is arranged inclined toward the outlet end of the water outlet pipe (5).

6. The water pump and electrical integrated water self-cooling system according to claim 5, characterized in that: A filtering device (6) is provided on the connection side between the heat dissipation water inlet pipe (7) and the water outlet pipe (5).

7. The water pump and electrical integrated water self-cooling system according to claim 2, characterized in that: The input end of the rectifier (351) is electrically connected to an AC power source, the output end is electrically connected to the input end of the filter (352), the output end of the filter (352) is electrically connected to the input end of the inverter (353), and the output end of the inverter (353) is electrically connected to the AC motor (2); the controller (354) is electrically connected to the inverter (353) and is used to adjust the output voltage of the inverter (353).

8. The water pump and electrical integrated water self-cooling system according to claim 1, characterized in that: The pressure sensor (4) is arranged close to the water outlet of the water pump (1).

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