Novel shielding type cycloid internal gear pump

Abstract

The invention discloses a novel shielding type cycloid internal gear pump, and relates to the technical field of shielding type gear pumps. The pump comprises a pump body, a motor, a machine shell cylinder and a gear set. The pump is characterized in that a pump head is arranged at the top of the pump body, a pump tail is arranged at the bottom of the pump body, the motor is arranged in the pump body and comprises a stator assembly and a rotor assembly, and the gear set is arranged in the pump body and matched with the motor. A main shaft is inserted between the rotor assembly and the stator assembly. Through the coaxial design of the inner gear and the rotor assembly, the length of the main shaft is effectively shortened, the overall size of the pump is reduced, the dynamic sealing problem is solved through the special structures of the stator assembly and the rotor assembly, and the circulating heat dissipation function is achieved. The outer gear and the ball bearing are coaxially arranged, so that the abrasion condition of the outer gear is effectively improved, part of radial force is balanced, and the service life of the whole pump is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of shielded gear pumps, and in particular relates to a novel shielded cycloid internal meshing gear pump. Background Art

[0002] With the rapid development of industry, the demand for miniaturization and integration of industrial equipment is getting higher and higher. Miniaturization can reduce the space occupied by equipment and improve the flexibility of the system. Integration can reduce the difficulty of installation and commissioning and improve the overall performance of the system. Therefore, compared with traditional centrifugal pumps, gear pumps will become the future development trend.

[0003] As a common mechanical pump, gear pump has the advantages of simple structure, few parts, easy processing and stable and reliable operation. Therefore, it is suitable for miniaturization and conducive to controlling production costs. Compared with traditional centrifugal pumps, gear pumps have more stable and efficient working performance in the range of low viscosity, small flow and high head. They are more suitable as medium circulation components in working scenarios such as data center refrigeration, energy storage battery refrigeration and household refrigeration, and can achieve better energy-saving effects.

[0004] Since traditional gear pumps use a structure in which the gear set and the motor are separated, there are problems with the connection between the gear shaft and the motor shaft and unreliable dynamic seals of the shaft, which greatly affects the performance and reliability of the gear pump and is prone to serious wear of rotating parts such as gears, bearings, and shafts, and is also prone to leakage of the medium. At the same time, the heat dissipation performance of the motor is also poor. Although the magnetically driven gear pump solves the problem of easy leakage of the dynamic seal of the pump shaft, the size of the pump is significantly increased due to the magnetic connection structure, and it still cannot effectively solve the problem of poor heat dissipation performance of the motor. The external gear of the traditional cycloid internal meshing gear pump is in direct contact with the gear cavity wall, resulting in severe wear of the external gear, unbalanced radial force, and a short service life of the entire pump.

[0005] To this end, we provide a new type of shielded cycloid internal gear pump to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a novel shielded cycloid internal gear pump, which effectively shortens the main shaft length and reduces the overall volume of the pump through the coaxial design of the internal gear and the rotor assembly, and utilizes the special structure of the stator assembly and the rotor assembly to solve the dynamic sealing problem, realize the circulation heat dissipation function and the coaxial arrangement of its external gear and the ball bearing, effectively improves the wear of the external gear, balances part of the radial force, and increases the service life of the entire pump, solving the problems of large body volume, poor heat dissipation effect, easy wear of gears and short service life in the existing shielded cycloid internal gear pump.

[0007] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a new type of shielded cycloid internal gear pump, including a pump body, a motor, a casing barrel and a gear set; the characteristics are: a pump head is arranged on the top of the pump body, a pump tail is arranged on the bottom of the pump body, the motor is arranged inside the pump body, the motor is composed of a stator assembly and a rotor assembly, and the gear set is arranged in the pump body and matches the motor. A main shaft is inserted between the rotor assembly and the stator assembly, a thrust bearing seat is symmetrically fixedly connected on the peripheral side surface of the casing barrel, a thrust bearing is fixedly connected to the thrust bearing seat, and a flow cavity is opened on the two thrust bearing seats, and the flow cavity is connected to each other and a high-pressure area is arranged.

[0008] The present invention is further configured such that gear cover plates are symmetrically arranged on the circumferential side surface of the main shaft, the gear group includes an internal gear sleeved on the circumferential side surface of the main shaft, the space between the two cover plates is a gear cavity, an external gear is arranged in the gear cavity which meshes with the internal gear in a cycloidal manner, a plurality of ball bearings in a circular array are fixedly connected to the external gear, an oil suction cavity is arranged on one side surface of one gear cover plate, and an oil pressure cavity is arranged on one side surface of the other gear cover plate.

[0009] The present invention is further configured such that a rotor shielding sleeve is provided on the rotor assembly, a stator shielding sleeve is provided on the stator assembly, and a flow gap is formed between the stator shielding sleeve and the rotor shielding sleeve.

[0010] The present invention is further configured such that the rotor assembly and the stator assembly are potted to form a rotor potting layer and a stator potting layer for enhanced insulation.

[0011] The present invention is further configured such that the inside of the pump body is symmetrically fixedly connected with a bearing seat, the tops of the two bearing seats are each provided with a penetrating bearing hole, the inner circumferential side surfaces of the bearing holes are fixedly embedded with a bearing, the inner ring of the bearing is concentrically arranged with the main shaft, the inner circumferential side surfaces of the bearing are provided with a plurality of flow grooves, and the flow grooves are spirally arranged.

[0012] The present invention is further configured such that the internal gear is fixedly arranged on the peripheral side surface of the main shaft by means of a retaining spring.

[0013] The present invention is further configured such that a plurality of thrust bearings are fixedly connected to the main shaft, and the thrust bearings are in compression contact with the inner circumferential side surface of the pump body.

[0014] The present invention is further configured such that a liquid inlet is provided at the top of the pump head, and a liquid outlet is provided at the bottom of the pump tail.

[0015] The present invention has the following beneficial effects: 1. The present invention greatly simplifies the connection between components by arranging the gear set and the motor in the same pump body and fixing the internal gear and the rotor assembly through the main shaft, thereby greatly shortening the length of the main shaft. While achieving the purpose of reducing the volume of the entire pump, it is also beneficial to reduce the vibration of the main shaft to reduce the wear of the gears and bearings, so that the product has a longer service life and higher working reliability, and solves the problem of easy leakage caused by dynamic seals in traditional gear pumps.

[0016] 2. The present invention forms a flow channel connected to the flow channel in the pump body through the gap between the rotor shielding sleeve and the stator shielding sleeve. The medium flows through the flow channel to take away the heat generated by the motor, achieving the effect of liquid cooling and solving the heat dissipation problem of the motor.

[0017] 3. In the present invention, under the action of pressure, the medium spontaneously enters the bearing hole and the bearing flow groove. Through the flow of the medium, the bearing, gear set and main shaft can be lubricated, which effectively reduces the wear of parts and is conducive to the discharge of impurities in the system, ensuring the stability of product operation.

[0018] 4. The present invention realizes that the internal gear is detachably connected to the main shaft axially, so that the internal gear can be replaced and the wear condition can be visualized; the internal gear and the main shaft are fixedly connected by a retaining spring, which can balance the axial force of the entire pump and reduce the wear of the gear.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the cross-sectional plan structure of a new type of shielded cycloid internal meshing gear pump.

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0023] Figure 3 It is a schematic diagram of the cross-sectional plan structure of the casing barrel in a new type of shielded cycloid internal meshing gear pump.

[0024] Figure 4 This is a schematic diagram of the axial cross-section structure of a new type of shielded cycloid internal gear pump.

[0025] Figure 5This is a schematic diagram of the structure of the gear set in a new type of shielded cycloid internal meshing gear pump.

[0026] Figure 6 The figure is a schematic diagram of the axial cross-section structure of a gear set in a new shielded cycloid internal meshing gear pump.

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of a pump head in a new type of shielded cycloid internal gear pump.

[0028] Figure 8 This is a schematic diagram of the three-dimensional structure of the pump tail in a new type of shielded cycloid internal gear pump.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1- pump body, 11- pump head, 111- liquid inlet, 113- high pressure area, 12- bearing seat, 121- bearing hole, 122- flow chamber, 123- bearing, 124- thrust bearing, 125- thrust bearing seat, 13- casing barrel, 14- liquid outlet, 15- pump tail, 2- gear set, 21- internal gear, 22- external gear, 23- gear cover, 231- oil suction chamber, 24- gear chamber, 25- oil pressure chamber, 26- ball bearing, 3- motor, 31- stator assembly, 311- stator shielding sleeve, 32- rotor assembly, 321- rotor shielding sleeve, 322- main shaft, 33- flow gap. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] For specific embodiment 1, please refer to Figure 1-8The present invention is a novel shielded cycloid internal gear pump, comprising a pump body 1, a motor 3, a casing barrel 13 and a gear set 2; a pump head 11 is arranged on the top of the pump body 1, a pump tail 15 is arranged on the bottom of the pump body 1, a liquid inlet 111 is opened on the top of the pump head 11, a liquid outlet 14 is opened on the bottom of the pump tail, the motor 3 is arranged inside the pump body 1, the motor 3 is composed of a stator assembly 31 and a rotor assembly 32, a rotor shielding sleeve 321 is covered on the rotor assembly 32, a stator shielding sleeve 311 is covered on the stator assembly 31, a flow gap 33 is formed between the stator shielding sleeve 311 and the rotor shielding sleeve 321, the rotor assembly 32 and the stator assembly 31 are formed by potting to enhance insulation The rotor potting layer and the stator potting layer, the gear set 2 is arranged in the pump body 1 and matches the motor 3. A main shaft 322 is inserted between the rotor assembly 32 and the stator assembly 31. Thrust bearing seats 125 are symmetrically fixedly connected to the circumferential side surfaces of the casing barrel 13. Thrust bearings 124 are fixedly connected to the thrust bearing seats 125. A flow cavity 122 is provided on the two thrust bearing seats 125. The flow cavity 122 is connected to a high-pressure area 112.

[0032] The operation process of this embodiment is as follows: the stator assembly 31 is energized to generate a changing magnetic field and drive the rotor assembly 32 to rotate, so that the main shaft 322 rotates with the rotor assembly 32 and drives the internal gear 21 to rotate, the internal gear 21 meshes with the external gear 22 to rotate, and the rotation of the external gear 22 drives the ball bearing 26 to rotate, so that the gear set 2 does work on the medium and forms a high-pressure medium in the high-pressure area 112. A part of the medium in the high-pressure area 112 passes through the flow gap 33 and is discharged from the flow cavity 122 to the liquid outlet 14, a part of the medium flows through the bearing hole 121 and lubricates and cools the main shaft 322, the bearing 123 and the thrust bearing 124; another part flows to the matching gaps of various components and is used to discharge the gas accumulated in the pump, thereby preventing cavitation during the operation of the pump, and the medium is in direct contact with the motor 3, which is beneficial to the heat dissipation of the motor, improves the self-lubricating ability of the equipment, and effectively prevents the wear of the bearing 123.

[0033] For specific embodiment 2, please refer to Figure 1-8On the basis of the specific embodiment 1, the peripheral side of the main shaft 322 is symmetrically provided with a gear cover plate 23, the gear set 2 includes an internal gear 21 sleeved on the peripheral side of the main shaft 322, the internal gear 21 is fixedly provided on the peripheral side of the main shaft 322 by a retaining spring, the space between the two covers 23 is a gear cavity 24, the gear cavity 24 is provided with an external gear 22 that meshes with the internal gear 21 in a cycloidal manner, the external gear 22 is fixedly connected with a plurality of ball bearings 26 in a circumferential array, one side of a gear cover plate 23 is provided with an oil suction cavity 231, and the other side of the gear cover plate 23 is provided with an oil suction cavity 231. A pressure oil chamber 25 is provided on one side of a gear cover plate 23, and bearing seats 12 are symmetrically fixedly connected inside the pump body 1. The tops of the two bearing seats 12 are provided with penetrating bearing holes 121, and the inner circumferential sides of the bearing holes 121 are fixedly embedded with bearings 123. The inner ring of the bearing 123 is concentrically arranged with the main shaft 322, and the inner circumferential side of the bearing 123 is provided with a plurality of flow grooves, which are arranged in a spiral shape. A plurality of thrust bearings 124 are fixedly connected to the main shaft 322, and the thrust bearings 124 are in extrusion contact with the inner circumferential side of the pump body 1.

[0034] The operation process of this embodiment is as follows: by arranging the gear set 2 and the motor 3 in the pump body 1, and fixing the internal gear 21 and the rotor assembly 32 by the main shaft 322, the connection between the gear set 2 and the motor 3 is greatly simplified, so that the length of the main shaft 322 is greatly shortened, while achieving the purpose of reducing the volume of the pump, it is also beneficial to reduce the vibration of the main shaft 322, so as to reduce the wear of the gears and bearings, so that the product has a longer service life and higher working reliability, and solves the problem of easy leakage caused by dynamic sealing in traditional gear pumps; by fixing the external gear 22 and the ball bearing 26, the wear between the external gear 22 and the gear cavity 24 is effectively reduced, so that the product has a longer service life.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A novel shielded cycloid internal gear pump, comprising a pump body (1), a motor (3), a casing (13) and a gear set (2); characterized in that: The pump body (1) is provided with a pump head (11) at the top, and a pump tail (15) is provided at the bottom of the pump body (1). The motor (3) is provided inside the pump body (1), and the motor (3) is composed of a stator assembly (31) and a rotor assembly (32). The gear set (2) is provided inside the pump body (1) and matches the motor (3). A main shaft (322) is inserted between the rotor assembly (32) and the stator assembly (31). A thrust bearing seat (125) is symmetrically fixedly connected to the circumferential side surface of the casing barrel (13), and a thrust bearing (124) is fixedly connected to the thrust bearing seat (125). A flow chamber (122) is provided on the two thrust bearing seats (125), and the flow chambers (122) are connected to each other and a high-pressure area (112) is provided.

2. A novel shielded cycloid internal gear pump according to claim 1, characterized in that: Gear covers (23) are symmetrically arranged on the circumferential side surface of the main shaft (322); the gear set (2) comprises an internal gear (21) sleeved on the circumferential side surface of the main shaft (322); the space between the two covers (23) is a gear cavity (24); an external gear (22) meshing with the internal gear (21) in a cycloidal manner is arranged in the gear cavity (24); a plurality of ball bearings (26) arranged in a circumferential array are fixedly connected to the external gear (22); an oil suction cavity (231) is arranged on one side surface of one gear cover (23); and an oil pressure cavity (25) is arranged on one side surface of the other gear cover (23).

3. A novel shielded cycloid internal gear pump according to claim 2, characterized in that: The rotor assembly (32) is covered with a rotor shielding sleeve (321), the stator assembly (31) is covered with a stator shielding sleeve (311), and a flow gap (33) is formed between the stator shielding sleeve (311) and the rotor shielding sleeve (321).

4. A novel shielded cycloid internal gear pump according to claim 3, characterized in that: The rotor assembly (32) and the stator assembly (31) are potted to form a rotor potting layer and a stator potting layer for enhanced insulation.

5. A novel shielded cycloid internal gear pump according to claim 4, characterized in that: The pump body (1) is symmetrically and fixedly connected to the inside of the pump body (1), and the tops of the two bearing seats (12) are each provided with a through bearing hole (121), and the inner peripheral side of the bearing hole (121) is fixedly embedded with a bearing (123), and the inner ring of the bearing (123) is concentrically arranged with the main shaft (322), and the inner peripheral side of the bearing (123) is provided with a plurality of flow grooves, and the flow grooves are arranged in a spiral shape.

6. A novel shielded cycloid internal gear pump according to claim 5, characterized in that: The internal gear (21) is fixedly arranged on the circumferential side surface of the main shaft (322) via a retaining spring.

7. A novel shielded cycloid internal gear pump according to claim 6, characterized in that: A plurality of thrust bearings (124) are fixedly connected to the main shaft (322), and the thrust bearings (124) are in compression contact with the inner circumferential side surface of the pump body (1).

8. A novel shielded cycloid internal gear pump according to claim 7, characterized in that: The top of the pump head (11) is provided with a liquid inlet (111), and the bottom of the pump tail is provided with a liquid outlet (14).

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