Booster pump based on variable-frequency constant-pressure control technology

Abstract

The booster pump based on the variable-frequency constant-pressure control technology comprises a variable-frequency controller, a motor and an impeller and is characterized in that one side of the motor is connected with a booster cavity, and a rotating shaft of the motor extends into the booster cavity in the axial direction of the booster cavity; a water inlet and a water outlet are formed in the pressurizing cavity; an impeller cavity is formed in the booster cavity, a pump cavity is formed by the booster cavity in the space outside the inner impeller cavity, and an impeller on the rotating shaft is located in the impeller cavity; water flow flows into the impeller cavity through the water inlet structure, flows to the pump cavity from the end, away from the water inlet structure, of the impeller cavity after being pressurized by an impeller located in the impeller cavity, and flows out of the booster pump through the water outlet in the pump cavity. An independent cavity communicated with the water inlet and the impeller cavity is formed in the water inlet structure and communicated with the pump cavity through a negative pressure valve. According to the scheme, air can be fundamentally prevented from entering the booster pump, the use performance of the booster pump can be effectively improved, and the maintenance cost of the booster pump is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of booster pumps and relates to a booster pump based on variable frequency constant pressure control technology. Background Art

[0002] A booster pump is a common pump used to increase water pressure. Its working principle is mainly as follows: the booster pump creates a low-pressure area through the rotation of the impeller and draws water from the water source; when the impeller rotates, it converts electrical energy into kinetic energy of water, and the water is accelerated under the action of the impeller; as the water moves from the center of the impeller to the edge, the speed gradually slows down, and the kinetic energy is converted into pressure energy, resulting in an increase in water pressure; the outer casing of the booster pump, the pump casing or the guide casing, guides the high-speed water flow thrown out from the impeller to the outlet to form a stable water flow.

[0003] In actual use, if air enters the pump body, the air will occupy the space inside the pump, resulting in a reduction in the pump output flow rate and affecting the boosting effect. In order to avoid air in the booster pump, people currently perform exhaust operations on the pump during regular maintenance when using the booster pump, but this method will obviously increase the cost of using the booster pump. There are also means to actively monitor whether there is air entering the pump body, and notify the user to perform exhaust operations when air is detected, but this is always a remedial measure and does not fundamentally prevent the entry of air. Utility Model Content

[0004] The purpose of the utility model is to provide a booster pump based on variable frequency constant pressure control technology in order to solve the above problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A booster pump based on variable frequency constant pressure control technology, comprising a variable frequency controller, a motor and an impeller, characterized in that a booster chamber is connected to one side of the motor, and a rotating shaft of the motor extends axially into the booster chamber;

[0007] The boost chamber is provided with a water inlet and a water outlet;

[0008] An impeller cavity is arranged in the boosting cavity along the axial direction of the rotating shaft, and the space outside the impeller cavity in the boosting cavity constitutes a pump cavity, and the impeller on the rotating shaft is located in the impeller cavity;

[0009] The water inlet has a water inlet structure, through which water flows into the impeller chamber, and the impeller located in the impeller chamber pressurizes the water flow, and then the water flows to the pump chamber at the end of the impeller chamber away from the water inlet structure, and then flows out of the booster pump through the water outlet in the pump chamber;

[0010] The water inlet structure has an independent chamber connected with the water inlet and the impeller chamber, and the independent chamber is connected with the pump chamber through a negative pressure valve.

[0011] Through the above technical solution, it is possible to fundamentally prevent air from entering, effectively improve the performance of the booster pump and reduce the maintenance cost of the booster pump.

[0012] In the above-mentioned booster pump based on variable frequency constant pressure control technology, a water inlet check valve is also provided at the water inlet.

[0013] Through the above technical solution, the design of the check valve can ensure that there is always water in the pump chamber, and there is no need to refill the water each time it is started. In addition, the water flow required to exhaust air is provided to the negative pressure valve, which can ensure the emptying effect of the negative pressure valve.

[0014] In the above-mentioned booster pump based on variable frequency constant pressure control technology, a multi-stage impeller is arranged on the rotating shaft and located in the impeller cavity, and the circumferential outer side of each stage of the impeller is surrounded by guide vanes for guiding water to the next set of impellers or the pump cavity space, and the multi-stage guide vanes are connected front and back to form the impeller cavity.

[0015] Through the above technical solution, the impeller cavity is formed by the front and rear guide vanes connected to each other, and the impellers of each stage pressurize and accelerate the water flow in the narrow space of the impeller cavity in turn, thereby ensuring the pressurization effect.

[0016] In the booster pump based on variable frequency constant pressure control technology, the guide vane includes a guide vane blade surrounding the corresponding impeller, and a guide vane housing located outside the circumferential direction of the guide vane blade, and the guide vane housing has a flow port;

[0017] The side of the guide vane blade close to the corresponding impeller has a circumferentially distributed first vortex flow channel, and the second vortex flow channel is connected to the side of the guide vane blade away from the corresponding impeller, and the side of the guide vane blade away from the corresponding impeller has a second vortex flow channel;

[0018] The guide vane housing cover is arranged on the side of the guide vane blade away from the corresponding impeller. After being pressurized at the corresponding impeller, the water flows from the first vortex flow channel to the second vortex flow channel, and enters the next-stage impeller or pump chamber from the flow port of the guide vane housing through the second vortex flow channel.

[0019] The guide vanes of the vortex flow channel are adapted to the direction of movement of the water flow under the action of the impeller, so that the water flow can be guided into the next-stage impeller or pump chamber with less resistance.

[0020] In the booster pump based on variable frequency constant pressure control technology, an end cover of the impeller chamber away from the water inlet structure is provided with an impeller chamber cover, and a side of the impeller chamber cover close to the impeller chamber is provided with a plurality of spaced abutment blocks;

[0021] The impeller chamber cover is arranged at one end of the impeller chamber through the abutment block cover, so that the water flow from the impeller chamber flows to the pump chamber through the gap between the abutment blocks.

[0022] In the above-mentioned booster pump based on variable frequency constant pressure control technology, a pump cover for separating the booster chamber from the motor is provided between the motor and the booster chamber;

[0023] A mounting seat for mounting the booster pump to a target position extends below the pump cover;

[0024] The impeller chamber cover is fixed on the pump cover.

[0025] Through the above, the impeller chamber can be relatively fixed with the pump cover through the impeller chamber cover, and the pressurized water flow inside it can be led out to the pump chamber through the gap between the abutment blocks.

[0026] In the booster pump based on the variable frequency constant pressure control technology, the water outlet is connected to an external connection pipe, and the external connection pipe is provided with a pressure sensor and a water flow switch connected to the variable frequency controller.

[0027] In the above-mentioned booster pump based on variable frequency constant pressure control technology, the variable frequency controller is fixed on the housing of the motor.

[0028] In the above-mentioned booster pump based on variable frequency constant pressure control technology, a pressure tank is also provided on the external connecting pipe.

[0029] In the booster pump based on variable frequency constant pressure control technology, the motor is a through-type motor with rotating shafts on both sides of the motor, one side of the rotating shaft is used to connect the impeller, and the other side is connected to the heat dissipation blades.

[0030] Compared with the existing technology, the advantages of the utility model are:

[0031] 1. A specially designed water inlet structure is designed at the air inlet to prevent air from entering the pump from the water inlet, thus fundamentally preventing air from entering the pump cavity;

[0032] 2. The check valve and the negative pressure valve are designed in coordination. The former can ensure that the water flows only toward the pump chamber, ensuring that the pump chamber is always filled with water. The latter, when air enters from the water inlet, opens the negative pressure valve to return the water in the pump chamber to the water inlet, thereby avoiding the entry of air and achieving the effect of exhausting air.

[0033] 3. The water entering from the water inlet passes through each impeller in turn. Each time it passes through an impeller, the pressure and speed of the water flow will increase, achieving gradual pressurization. The water flow at each level of the outlet is guided by the guide vane to flow to the next level of the inlet, ensuring that the water flows into each level of the impeller in the correct direction and speed, ensuring the pressurization efficiency;

[0034] 4. This solution directly utilizes the motor of the booster pump body, adopts a motor with rotating shafts on both sides, and connects heat dissipation blades on the side away from the impeller, which can achieve heat dissipation while the booster pump is working. There is no need to design an additional heat dissipation structure, and it can ensure that the booster pump has a good heat dissipation effect.

[0035] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is the structural diagram of the booster pump based on variable frequency constant pressure control technology in this solution;

[0037] Figure 2 This is a schematic diagram of the structure of the booster chamber in the booster pump based on the variable frequency constant pressure control technology of this scheme;

[0038] Figure 3 This is a cross-sectional view of the booster pump based on variable frequency constant pressure control technology in this solution;

[0039] Figure 4 This is the structure of the water inlet structure in the booster pump based on variable frequency constant pressure control technology. Figure 1 ;

[0040] Figure 5 This is the structure of the water inlet structure in the booster pump based on variable frequency constant pressure control technology. Figure 2 ;

[0041] Figure 6 This is a position relationship diagram of one of the first-stage impellers and its guide impeller and the rotating shaft in the booster pump based on variable frequency constant pressure control technology in this scheme;

[0042] Figure 7 This is the structural diagram of the guide impeller in the booster pump based on the variable frequency constant pressure control technology of this scheme;

[0043] Figure 8 This is a structural diagram of the guide impeller in the booster pump based on variable frequency constant pressure control technology from another perspective;

[0044] Fig. 9 This is a schematic diagram of the structure of the guide vane blades in the booster pump based on the variable frequency constant pressure control technology of this scheme;

[0045] Fig.10 This is the position relationship diagram between the impeller cavity cover and the impeller cavity in the booster pump based on the variable frequency constant pressure control technology of this scheme;

[0046] Fig.11 This is the structural diagram of the impeller cavity cover in the booster pump based on variable frequency constant pressure control technology in this scheme;

[0047] Fig.12 This is a structural diagram of the scheme based on variable frequency constant pressure control technology in which the motor end cover is removed from the booster pump.

[0048] In the figure: frequency conversion controller 1; motor 2; pump cover 22; impeller 3; rotating shaft 21; boost chamber 4; water inlet 41; water outlet 42; impeller chamber 43; pump chamber 44; water inlet check valve 45; water inlet structure 5; independent chamber 51; negative pressure valve 52; through hole 53; guide vane 6; guide vane blade 61; guide vane housing 62; flow port 63; first vortex flow channel 64; second vortex flow channel 65; circumferential convex ring 66; impeller chamber cover 7; abutment block 71; card table 72; external connecting pipe 8; pressure sensor 81; water flow switch 82; pressure tank 83; heat dissipation blade 9. DETAILED DESCRIPTION

[0049] The utility model is further described below in conjunction with the accompanying drawings.

[0050] like Figure 1-Figure 3 As shown, this embodiment provides a booster pump based on variable frequency constant pressure control technology, including a variable frequency controller 1, a motor 2 and an impeller 3, wherein the variable frequency controller 1 is fixed to the housing of the motor 2. The frequency converter and the controller can be independently provided, including the frequency converter and the controller, or a two-in-one integrated variable frequency controller 1 can be used, which is not limited here.

[0051] In particular, one side of the motor 2 is connected to the boost chamber 4, and the rotating shaft 21 of the motor 2 extends axially along the boost chamber 4 into the boost chamber 4. The boost chamber 4 is provided with a water inlet 41 and a water outlet 42.

[0052] An impeller chamber 43 is arranged in the boost chamber 4 along the axial direction of the rotating shaft 21 . The space outside the impeller chamber 43 in the boost chamber 4 constitutes a pump chamber 44 . The impeller 3 on the rotating shaft 21 is located in the impeller chamber 43 .

[0053] The water inlet 41 has a water inlet structure 5, and the water flows into the impeller chamber 43 through the water inlet structure 5. The water is pressurized by the impeller 3 located in the impeller chamber 43, and then flows to the pump chamber 44 at the end of the impeller chamber 43 away from the water inlet structure 5, and flows out of the booster pump through the water outlet 42 in the pump chamber 44. The water flow direction can be referred to Figure 3 As shown by the dotted arrow. Figure 4 and Figure 5As shown, the water inlet structure 5 has an independent chamber 51 connected with the water inlet 41 and the impeller chamber 43, and the independent chamber 51 is connected with the pump chamber 44 through a negative pressure valve 52. Specifically, a through hole 53 is provided at the bottom of the independent chamber, and a connecting passage connected with the pump chamber 44 is provided below the through hole 53, and the negative pressure valve 52 is located at the end of the connecting passage. When air enters the water inlet 41, the negative pressure valve 52 opens, and the water in the pump chamber 44 flows back to the water inlet 41 through the negative pressure valve and the circulation channel to achieve the function of exhausting air. When the water inlet 41 is full of water, the pressure difference on both sides causes the negative pressure valve 52 to close, and the water continuously entering the water inlet 41 directly enters the impeller chamber 43 through the independent chamber 51.

[0054] Preferably, a water inlet check valve 45 is also provided at the water inlet 41 to ensure that there is always water in the pump chamber 44, so that there is no need to refill the water each time the pump is started, and to provide necessary pump chamber water for the negative pressure valve to drain water, and cooperate with the negative pressure valve 52 to achieve a better air exhaust effect.

[0055] Specifically, a multi-stage impeller 3 is disposed in the impeller chamber 43 on the rotating shaft 21. Figure 6 As shown, the outer circumferential side of each impeller 3 is surrounded by a guide vane 6 for guiding water to the next impeller 3 or the pump chamber 44, and multiple guide vanes 6 are connected front and back to form an impeller chamber 43. The water entering from the water inlet 41 passes through each impeller 3 in turn. Each time it passes through an impeller 3, the pressure and speed of the water flow will increase, and a gradual pressurization is achieved. The guide vane 6 is used to guide the direction of the water flow, ensure that the water flow enters the impeller in the correct direction and speed, and help reduce the impact of the water flow on the impeller, thereby improving the energy conversion efficiency of the water flow.

[0056] Specifically, Figure 7-Figure 9 As shown, the guide vane 6 includes a guide vane blade 61 surrounding the corresponding impeller 3, and a guide vane housing 62 located on the circumferential outer side of the guide vane blade 61, and a flow port 63 is provided on the guide vane housing 62. The side of the guide vane blade 61 close to the corresponding impeller 3 has a circumferentially distributed first vortex flow channel 64, and the second vortex flow channel 65 is connected to the side of the guide vane blade 61 away from the corresponding impeller 3, and the side of the guide vane blade 61 away from the corresponding impeller 3 has a second vortex flow channel 65. The guide vane housing 62 is covered on the side of the guide vane blade 61 away from the corresponding impeller 3, and the water flow flows from the first vortex flow channel 64 to the second vortex flow channel 65 after being pressurized at the corresponding impeller 3, and enters the next-stage impeller 3 or the pump chamber 44 from the flow port 63 of the guide vane housing 62 through the second vortex flow channel 65.

[0057] Furthermore, if Fig.10 , Fig.11As shown, an end cover of the impeller chamber 43 away from the water inlet structure 5 is provided with an impeller chamber cover 7, and a side of the impeller chamber cover 7 close to the impeller chamber 43 is provided with a plurality of spaced abutment blocks 71. The impeller chamber cover 7 is covered at one end of the impeller chamber 43 through the abutment blocks 71, so that the water flow from the impeller chamber 43 flows to the pump chamber 44 through the gaps between the abutment blocks 71.

[0058] The abutment blocks 71 on the impeller chamber cover 7 are distributed circumferentially, and each abutment block 71 has a clamping platform 72. The guide vane housing 62 adjacent thereto has a circumferential convex ring 66. The circumferential convex ring 66 abuts against the clamping platform 72 to cover the impeller chamber cover 7 at one end of the impeller chamber 43.

[0059] Furthermore, a pump cover 22 is provided between the motor 2 and the boost chamber 4 for separating the boost chamber 4 from the motor 2 , and a mounting seat 23 for mounting the boost pump to a target position extends below the pump cover 22 , and the impeller chamber cover 7 is fixed on the pump cover 22 .

[0060] The water outlet 42 is connected to an external connection pipe 8, and the external connection pipe 8 is provided with a pressure sensor 81 and a water flow switch 82 connected to the frequency conversion controller 1. The water flow switch 3 is used to detect whether there is water flowing in the system. When water flow is detected, a signal is sent to the frequency conversion controller 1, and the frequency conversion controller 1 controls the pump to start. When the water flow stops, a signal is also sent to the frequency conversion controller 1, and the frequency conversion controller 1 controls the pump to stop. The pressure sensor 81 is used to detect the system pressure, and the pressure sensor 81 is preferably connected to a memory to store the detection pressure of the pressure sensor 81 at the last shutdown, and the memory is connected to the frequency conversion controller 1 to provide the stored detection pressure at the last shutdown to the frequency conversion controller 1 so that the frequency conversion controller 1 can use the stored detection pressure as a starting pressure reference.

[0061] Furthermore, a pressure tank 83 is provided on the external connecting pipe 8 for storing a certain amount of water to adapt to small fluctuations in water pressure, which can reduce the number of frequent starts of the booster pump, especially overcome the frequent start and stop of the booster pump caused by small fluctuations in water pressure, thereby extending the service life of the booster pump.

[0062] Furthermore, if Fig.12 As shown, the motor 2 adopts a through-type motor 2 with a rotating shaft 21 on both sides of the motor 2. The rotating shaft 21 on one side is used to connect the impeller 3, and the other side is connected with a heat dissipation blade 9, which can achieve heat dissipation while the boost pump is working. There is no need to design an additional heat dissipation structure, and the boost pump can be guaranteed to have a good heat dissipation effect.

[0063] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

[0064] Although this article uses more terms such as frequency conversion controller 1; motor 2; pump cover 22; impeller 3; rotating shaft 21; boost chamber 4; water inlet 41; water outlet 42; impeller chamber 43; pump chamber 44; water inlet check valve 45; water inlet structure 5; independent chamber 51; negative pressure valve 52; through hole 53; guide vane 6; guide vane blade 61; guide vane housing 62; flow port 63; first vortex flow channel 64; second vortex flow channel 65; impeller chamber cover 7; abutment block 71; card table 72; external connecting pipe 8; pressure sensor 81; water flow switch 82; pressure tank 83; heat dissipation blade 9, it does not exclude the possibility of using other terms. The use of these terms is only for more convenient description and explanation of the essence of the utility model, and interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A booster pump based on variable frequency constant pressure control technology, comprising a variable frequency controller (1), a motor (2) and an impeller (3), characterized in that: One side of the motor (2) is connected to a boost chamber (4), and a rotating shaft (21) of the motor (2) extends axially along the boost chamber (4) into the boost chamber (4); The boost chamber (4) is provided with a water inlet (41) and a water outlet (42); An impeller chamber (43) is arranged in the boost chamber (4) along the axial direction of the rotating shaft (21); the space outside the impeller chamber (43) in the boost chamber (4) constitutes a pump chamber (44); and the impeller (3) on the rotating shaft (21) is located in the impeller chamber (43); The water inlet (41) is provided with a water inlet structure (5), and water flows into the impeller chamber (43) through the water inlet structure (5), and the water flow is pressurized by the impeller (3) located in the impeller chamber (43), and then flows to the pump chamber (44) at one end of the impeller chamber (43) away from the water inlet structure (5), and flows out of the booster pump through the water outlet (42) in the pump chamber (44); The water inlet structure (5) has an independent chamber (51) in communication with the water inlet (41) and the impeller chamber (43), and the independent chamber (51) is in communication with the pump chamber (44) via a negative pressure valve (52).

2. The booster pump based on variable frequency constant pressure control technology according to claim 1 is characterized in that: The water inlet (41) is also provided with a water inlet check valve (45).

3. The booster pump based on variable frequency constant pressure control technology according to claim 1 is characterized in that: A plurality of impellers (3) are arranged on the rotating shaft (21) and located in the impeller cavity (43), and the circumferential outer side of each impeller (3) is surrounded by a guide vane (6) for guiding water to the next impeller (3) or the pump cavity (44). The plurality of guide vanes (6) are connected front to back to form the impeller cavity (43).

4. The booster pump based on variable frequency constant pressure control technology according to claim 3 is characterized in that: The guide vane (6) comprises a guide vane blade (61) surrounding the corresponding impeller (3), and a guide vane housing (62) located on the circumferential outer side of the guide vane blade (61), and the guide vane housing (62) is provided with a flow opening (63); The side of the guide vane blade (61) close to the corresponding impeller (3) has a first vortex flow channel (64) distributed in the circumferential direction, and the side of the guide vane blade (61) away from the corresponding impeller (3) has a second vortex flow channel (65), and the second vortex flow channel (65) is connected to the side of the guide vane blade (61) away from the corresponding impeller (3); The guide vane housing (62) is arranged on a side of the guide vane blade (61) away from the corresponding impeller (3); after being pressurized at the corresponding impeller (3), the water flows from the first vortex flow channel (64) to the second vortex flow channel (65), and enters the next-stage impeller (3) or the pump chamber (44) from the flow port (63) of the guide vane housing (62) via the second vortex flow channel (65).

5. The booster pump based on variable frequency constant pressure control technology according to claim 4 is characterized in that: An end cover of the impeller chamber (43) away from the water inlet structure (5) is provided with an impeller chamber cover (7), and a side of the impeller chamber cover (7) close to the impeller chamber (43) is provided with a plurality of spaced-apart abutment blocks (71); The impeller chamber cover (7) is arranged on one end of the impeller chamber (43) through a resistance block (71), so that water flowing out of the impeller chamber (43) flows into the pump chamber (44) through the gap between the resistance blocks (71).

6. The booster pump based on variable frequency constant pressure control technology according to claim 5, characterized in that: A pump cover (22) is provided between the motor (2) and the boost chamber (4) for separating the boost chamber (4) and the motor (2); A mounting seat (23) for mounting the booster pump to a target position extends below the pump cover (22); The impeller chamber cover (7) is fixed on the pump cover (22).

7. The booster pump based on variable frequency constant pressure control technology according to claim 1, characterized in that: The water outlet (42) is connected to an external connection pipe (8), and the external connection pipe (8) is provided with a pressure sensor (81) and a water flow switch (82) connected to the frequency conversion controller (1).

8. The booster pump based on variable frequency constant pressure control technology according to claim 7, characterized in that: The frequency conversion controller (1) is fixed on the casing of the motor (2).

9. The booster pump based on variable frequency constant pressure control technology according to claim 7, characterized in that: The external connecting pipe (8) is also provided with a pressure tank (83).

10. The booster pump based on variable frequency constant pressure control technology according to claim 1, characterized in that: The motor (2) is a through-type motor (2) having rotating shafts (21) on both sides of the motor (2), the rotating shaft (21) on one side being used to connect to the impeller (3), and the other side being connected to heat dissipation blades (9).

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