A high-efficiency silent permanent magnet DC brushless canned pump with integrated controller

Abstract

The invention discloses an efficient and silent permanent magnet DC brushless shielded pump with an integrated controller, comprising a pump body and a permanent magnet shielded DC brushless motor, the permanent magnet shielded DC brushless motor comprising a stator assembly, a rotor assembly and a controller; the stator assembly comprises a casing, the inner wall of which is provided with a winding stator; the rotor assembly comprises a fixed shaft, the left and right sides of the fixed shaft are respectively connected with water-lubricated bearings, a rotor shaft is connected between the two water-lubricated bearings, an impeller is connected to the left end of the rotor shaft, a rotor core matched with the winding stator is connected to the rotor shaft, and a rotor shielding sleeve is connected to the surface of the rotor core. The invention realizes the self-lubricating effect by designing a self-lubricating waterway; the installation of the integrated controller ensures the high efficiency of the shielded pump assembly operation and improves the cost performance of the product; the stator assembly and the rotor assembly are respectively glued with thermal conductive glue to form an integrated structure, which has a good thermal conductivity effect, and at the same time plays an anti-corrosion and shielding role, ensuring the efficient operation of the shielded pump.

Description

Technical Field

[0001] The invention relates to the technical field of pumps, and in particular to a high-efficiency silent permanent magnet direct current brushless shielded pump with an integrated controller. Background Art

[0002] The canned motor pump is a leak-free pump consisting of a pump and a canned motor. Due to its advantages of no leakage, small size and low noise, it is an important equipment for conveying special cooling liquids, toxic liquids (such as toxins, smelly liquids), dangerous liquids (such as corrosive, explosive, flammable and volatile liquids) and precious liquids. It is widely used in many occasions in the fields of petrochemical, national defense and military industry, aerospace, air conditioning and refrigeration, coolant cooling systems, medicine and food, atomic energy, etc.

[0003] The controller of the shielded pump in the prior art is separate from the pump body, which can easily cause the controller to be dragged during transportation, resulting in separation of the controller and the pump body, affecting use; in addition, the shielded pump in the prior art has poor thermal conductivity. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a high-efficiency silent permanent magnet DC brushless shielded pump with a simple structure, convenient operation and practical integrated controller.

[0005] The present invention is achieved by the following methods:

[0006] A high-efficiency silent permanent magnet DC brushless shielded pump with an integrated controller comprises a pump body and a permanent magnet shielded DC brushless motor fixed to each other, the permanent magnet shielded DC brushless motor comprises a stator assembly, a rotor assembly matched with the stator assembly and a controller, the stator assembly is electrically connected to the controller; an impeller cavity is arranged in the pump body, a liquid inlet and a liquid outlet are arranged on the pump body, the liquid inlet and the liquid outlet are respectively connected to the impeller cavity, the stator assembly comprises a casing connected to the pump body, an annular winding stator is arranged on the inner wall of the casing, the winding stator is electrically connected to the controller; a stator shielding sleeve is connected to the surface of the winding stator, and an installation groove for installing the controller is formed on the right side of the casing.

[0007] The rotor assembly includes a fixed shaft connected to the casing, the left and right sides of the fixed shaft are respectively connected to water-lubricated bearings, a rotor shaft is connected between the two water-lubricated bearings, the rotor shaft is rotatable relative to the fixed shaft through the water-lubricated bearings, the left end of the rotor shaft is connected to an impeller, the impeller is located in an impeller cavity, the rotor shaft is connected to a rotor core that matches the winding stator, and the surface of the rotor core is connected to a rotor shielding sleeve.

[0008] Furthermore, a first heat-conducting glue is filled between the stator shielding sleeve, the winding stator and the casing, so that the stator shielding sleeve, the winding stator and the casing form a whole.

[0009] Furthermore, a second heat-conducting glue is filled between the rotor shielding sleeve, the rotor core and the rotor shaft, so that the rotor shielding sleeve, the rotor core and the rotor shaft form a whole.

[0010] Furthermore, the inner wall of the water-lubricated bearing is provided with a self-lubricating water channel.

[0011] Furthermore, a cover plate is connected to the mounting groove.

[0012] Furthermore, the housing is provided with three-phase lead-out wire holes for passing three-phase lead-out wires of the winding stator and temperature sensor lead-out wire holes for passing temperature sensor lead-out wires.

[0013] Furthermore, the fixed shaft is connected to the casing via a shaft sleeve.

[0014] Furthermore, a balancing ring is connected to the rotor shaft.

[0015] Furthermore, the bottom of the housing is connected with a foot.

[0016] Furthermore, the rotor shaft is made of 316 stainless steel; the water-lubricated bearing is made of fiber-reinforced polyetheretherketone; the impeller and the pump body are made of 316 stainless steel; the sleeve is made of ceramic; and the fixed shaft is made of ceramic.

[0017] The beneficial effects of the present invention are: reasonable structure, ingenious design and cost saving. The self-lubricating effect is achieved by designing a self-lubricating waterway. The installation of an integrated controller ensures high efficiency in the assembly of the shielded pump and improves the cost performance of the product. The stator assembly and the rotor assembly are respectively glued with thermal conductive glue to form an integrated structure, which has good thermal conductivity and ensures efficient operation of the shielded pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of the present invention;

[0020] Figure 2 The front view of the stator assembly structure of the present invention;

[0021] Figure 3A side view of the stator assembly structure of the present invention;

[0022] Figure 4 Schematic diagram of the rotor assembly structure of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of 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. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of 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.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example:

[0027] A high-efficiency silent permanent magnet DC brushless canned pump with integrated controller, such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, it includes a pump body 1 and a permanent magnet shielded DC brushless motor fixed to each other, the permanent magnet shielded DC brushless motor includes a stator assembly 7, a rotor assembly 4 matched with the stator assembly 7 and a controller 8, the stator assembly 7 is electrically connected to the controller 8; an impeller chamber 11 is provided in the pump body 1, and a liquid inlet 12 and a liquid outlet 13 are provided on the pump body 1, and the liquid inlet 12 and the liquid outlet 13 are respectively connected to the impeller chamber 11.

[0028] Specifically, the stator assembly 7 includes a casing 71 connected to the pump body 1, and the inner wall of the casing 71 is provided with an annular winding stator 72, and the winding stator 72 is electrically connected to the controller 8; the specific structure of the winding stator 72 is commonly used and is not described in detail here; a layer of stator shielding sleeve 73 is connected to the surface of the winding stator 72, and a first thermal conductive adhesive 74 is filled between the stator shielding sleeve 73, the winding stator 72 and the casing 71, so that the stator shielding sleeve 73, the winding stator 72 and the casing 71 form a whole, so as to achieve the functions of protection, isolation, heat conduction and insulation of the winding stator 72. The first thermal conductive adhesive 74 also has an insulating effect, eliminating the conventional stator winding varnish dipping, and has the functions of high strength, overall sealing and high insulation strength.

[0029] Furthermore, a mounting groove 75 for mounting the controller 8 is formed on the right side of the housing 71 , and a cover plate 76 is connected to the mounting groove 75 for protecting the controller 8 .

[0030] Furthermore, the housing 71 is provided with a three-phase lead-out wire hole 77 for passing the three-phase lead-out wires of the winding stator 72 and a temperature sensor lead-out wire hole 78 for passing the temperature sensor lead-out wire, so as to facilitate the lead-out of the lead-out wires.

[0031] Specifically, the rotor assembly 4 includes a fixed shaft 3 connected to the casing 71 through a shaft sleeve 41, and the shaft sleeve 41 and the fixed shaft 3 are connected together through a flat head and do not rotate; the fixed shaft 3 is made of ceramic, and water-lubricated bearings 42 are respectively connected to the left and right sides thereof, and a rotor shaft 43 is connected between the two water-lubricated bearings 42, and the rotor shaft 43 is hollow. The outer ring of the water-lubricated bearing 42 is connected to the inner wall of the rotor shaft 43 by interference fit, and the inner wall of the water-lubricated bearing 42 is provided with a self-lubricating water channel 421 to ensure strength while meeting the self-lubrication requirements; the rotor shaft 43 is rotatable relative to the fixed shaft 3 through the water-lubricated bearing 42, and the left end of the rotor shaft 43 is connected to the impeller 44 by interference fit, and the impeller 44 is located in the impeller cavity 11 The impeller 44 works, driving the medium to enter from the liquid inlet 12 and flow out from the liquid outlet 13; the rotor shaft 43 is connected to a rotor core 45 that matches the winding stator 72. The specific structure of the rotor core 45 is the existing commonly used one and is not described in detail here; the surface of the rotor core 45 is connected to a rotor shielding sleeve 46, and a second thermal conductive adhesive 47 is poured between the rotor shielding sleeve 46, the rotor core 45 and the rotor shaft 43, so that the rotor shielding sleeve 46, the rotor core 45 and the rotor shaft 43 form a whole, so as to achieve the protection, isolation, heat conduction and insulation of the rotor core 45. The second thermal conductive adhesive 47 also has an insulating effect, eliminating the conventional stator winding varnish dipping, and has the effects of high strength, overall sealing and high insulation strength.

[0032] Furthermore, in order to protect the rotor core 45 and make it more stable during operation, a balancing ring 48 is connected to the rotor shaft 43 .

[0033] Furthermore, the rotor shaft 43 is made of 316 stainless steel, and the water-lubricated bearing 42 is made of fiber-reinforced polyetheretherketone material to achieve a silent effect. The impeller 44 and the pump body 1 are made of 316 stainless steel, and the sleeve 41 is made of ceramic, which can achieve anti-corrosion and shielding effects.

[0034] Furthermore, in order to facilitate the installation of the permanent magnet canned pump, a foot 79 is connected to the bottom of the casing 71 .

[0035] During specific operation, after the winding stator 72 is connected to alternating current, the winding stator 72 generates magnetism, causing the rotor core 45 to be subjected to force. The rotor core 45 rotates when the winding stator 72 is connected to external alternating current, thereby driving the rotor shaft 43 to rotate, and the rotor shaft 43 drives the impeller 44 to rotate. When the impeller 44 rotates, it will drive the medium to enter from the liquid inlet 12 and flow out from the liquid outlet 13 to complete the work.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-efficiency silent permanent magnet DC brushless canned pump with an integrated controller, comprising a pump body (1) and a permanent magnet shielded DC brushless motor fixed to each other, the permanent magnet shielded DC brushless motor comprising a stator assembly (7), a rotor assembly (4) matched with the stator assembly (7) and a controller (8), the stator assembly (7) being electrically connected to the controller (8); an impeller chamber (11) is provided in the pump body (1), a liquid inlet (12) and a liquid outlet (13) are provided on the pump body (1), the liquid inlet (12) and the liquid outlet (13) are respectively connected to the impeller chamber (11), and the pump body (1) is characterized in that: The stator assembly (7) comprises a casing (71) connected to the pump body (1); an annular winding stator (72) is provided on the inner wall of the casing (71); the winding stator (72) is electrically connected to the controller (8); a stator shielding sleeve (73) is connected to the surface of the winding stator (72); a mounting groove (75) for mounting the controller (8) is formed on the right side of the casing (71); the rotor assembly (4) comprises a fixed shaft (3) connected to the casing (71); water-lubricated bearings (42) are connected to the left and right sides of the fixed shaft (3); a rotor shaft (43) is connected between the two water-lubricated bearings (42); the rotor shaft (43) is rotatable relative to the fixed shaft (3) through the water-lubricated bearings (42); and an impeller ( 44), the impeller (44) is located in the impeller cavity (11), the rotor shaft (43) is connected to a rotor core (45) matched with the winding stator (72), and the surface of the rotor core (45) is connected to a rotor shielding sleeve (46); a first heat-conducting glue (74) is poured between the stator shielding sleeve (73), the winding stator (72) and the casing (71), so that the stator shielding sleeve (73), the winding stator (72) and the casing (71) form a whole; a second heat-conducting glue (47) is poured between the rotor shielding sleeve (46), the rotor core (45) and the rotor shaft (43), so that the rotor shielding sleeve (46), the rotor core (45) and the rotor shaft (43) form a whole; the inner wall of the water-lubricated bearing (42) is provided with a self-lubricating water channel (421).

2. According to the high-efficiency silent permanent magnet DC brushless canned pump with integrated controller as described in claim 1, it is characterized by: A cover plate (76) is connected to the mounting groove (75).

3. The high-efficiency silent permanent magnet DC brushless canned pump with integrated controller according to claim 1, characterized in that: The housing (71) is provided with a three-phase lead-out wire hole (77) for passing the three-phase lead-out wires of the winding stator (72) and a temperature sensor lead-out wire hole (78) for passing the temperature sensor lead-out wires.

4. The high-efficiency silent permanent magnet DC brushless canned pump with integrated controller according to claim 1, characterized in that: The fixed shaft (3) is connected to the housing (71) via a shaft sleeve (41).

5. The high-efficiency silent permanent magnet DC brushless canned pump with integrated controller according to claim 1, characterized in that: A balancing ring (48) is connected to the rotor shaft (43).

6. The high-efficiency silent permanent magnet DC brushless canned pump with integrated controller according to claim 1, characterized in that: The bottom of the housing (71) is connected to a foot (79).

7. The high-efficiency silent permanent magnet DC brushless canned pump with integrated controller according to claim 4, characterized in that: The material of the rotor shaft (43) is 316 stainless steel; the material of the water-lubricated bearing (42) is fiber-reinforced polyetheretherketone; the material of the impeller (44) and the pump body (1) is 316 stainless steel; the material of the shaft sleeve (41) is ceramic; and the material of the fixed shaft (3) is ceramic.

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