Radial fluid machine with cooling and lubrication by the medium flowing through the machine
By setting bypass openings or channels in the radial fluid machine, the problem of particle deposition in the secondary flow transition region is solved, ensuring the stability of motor cooling and bearing lubrication, and achieving more efficient fluid machine operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 海拉有限双合股份公司
- Filing Date
- 2022-01-14
- Publication Date
- 2026-05-29
AI Technical Summary
In radial fluid machinery, the secondary flow of the medium through the transition region from the first slit to the second slit may cause particle deposition, affecting motor cooling and bearing lubrication.
Bypass openings or bypass channels are provided in the transition area between the first and second gaps to guide a portion of the secondary flow to the low-pressure side, avoiding particle deposition. Bypass channel design reduces flow velocity variations and resistance, preventing particle accumulation in the bearing.
This effectively prevents particle deposition in the bearing, ensures motor cooling and bearing lubrication, and improves the operational reliability of radial fluid machinery.
Smart Images
Figure CN116583678B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a radial fluid machine, particularly a radial fluid working machine, such as a radial pump, having cooling and lubrication provided by a medium flowing through the machine, wherein the medium flows from the high-pressure side to the low-pressure side of the radial fluid machine.
[0002] The radial fluid machine has a housing assembly and a rotor assembly rotatably supported within the internal space of the housing assembly.
[0003] • In order to support the rotor assembly within the housing assembly, at least one first bearing is provided.
[0004] The rotor assembly includes a rotor and an impeller of an electric motor.
[0005] The motor, in addition to the rotor, includes a stator, which is part of the housing assembly.
[0006] The rotor of the motor is arranged in the first region of the rotor assembly, and the stator is arranged in the first region of the housing assembly.
[0007] • Wherein, the first region of the housing assembly surrounds the first region of the rotor assembly.
[0008] A distance is provided between the first region of the housing assembly and the first region of the rotor assembly, forming a first gap. This first gap connects to the high-pressure side of the radial fluid machine on one side and to the low-pressure side on the other side. During operation of the radial fluid machine, a secondary flow of the medium flowing through the radial fluid machine passes through this first gap, whereby heat is dissipated from the rotor and / or stator of the motor.
[0009] The first bearing has a second gap, which is disposed between the first bearing component of the rotor assembly and the first bearing component of the housing assembly.
[0010] • In this configuration, the first gap is connected to the second gap on either the low-pressure side or the high-pressure side, such that during the operation of the radial fluid machine, a portion of the medium flowing through the radial fluid machine flows through the second gap and is responsible for lubricating the bearing thereon. Background Technology
[0011] The inventors are aware of such radial fluid machines, and in particular such radial pumps. The advantage of such radial fluid machines is that the motor is cooled and the first bearing is partially lubricated by means of a secondary flow passing through the first slit. If the secondary flow is subsequently guided through the second slit, complete lubrication of the first bearing is possible.
[0012] If a secondary flow of the medium is guided from the first slit into the second slit, the secondary flow passes through a transition region from the first slit to the second slit. In this region, the secondary flow can be deflected.
[0013] Particles entrained by the secondary flow may deposit and collect in the first bearing. This can, for example, be generated by a section in the transition region between the first and second slots, where the flow velocity of the medium is lower. Deposited particles can reduce the secondary flow. This can adversely affect the cooling of the motor and the lubrication of the first bearing. Therefore, particle deposition should be avoided. Summary of the Invention
[0014] Therefore, the objective of this invention is to prevent particle deposition in the first bearing.
[0015] This task is solved according to the invention by providing a bypass opening or bypass channel in the transition region from the first slit to the second slit, the bypass opening or bypass channel connecting the transition region to the low-pressure side of the radial fluid machine, such that during operation of the radial fluid machine, only a portion of the medium flowing through the first slit also flows through the second slit. Preferably, a larger portion of the secondary flow is guided through the bypass opening or bypass channel. This larger portion of the secondary flow then entrains particles carried in the secondary flow, preventing particle deposition in the first bearing. Preferably, the connection of the bypass opening or bypass channel in the transition region is designed such that a portion of the secondary flow guided through the bypass opening or bypass channel is diverted less than in the prior art, thereby creating fewer sections with lower flow velocities in the first bearing. Furthermore, the bypass opening or bypass channel preferably has a cross-section that provides less resistance to the portion of the secondary flow than the second slit, such that the portion of the secondary flow flowing through the bypass opening or bypass channel is larger than the portion flowing through the second slit.
[0016] Therefore, it is possible that each bypass opening or each bypass channel has a minimum cross-section, and the length and width or diameter of at least one of the minimum cross-sections is greater than the distance between the first region of the housing assembly and the first region of the rotor assembly in the region of the second gap.
[0017] Furthermore, it is possible that the sum of the minimum cross-sectional areas of the bypass openings or bypass channels can be greater than the minimum cross-sectional area of the second gap.
[0018] In the radial fluid machine according to the invention, the first bearing component of the housing assembly can be formed by an annular groove. The first bearing component of the rotor assembly can be formed by a first ring embedded in the annular groove and being part of the rotor assembly.
[0019] A portion of the first gap may be formed between the radially outer limiting interface of the annular groove and the radially outer surface of the first ring. The second gap may be formed between the radially inner limiting interface of the annular groove and the radially inner surface of the first ring. The transition region from the first gap to the second gap may be formed between the axial limiting interface of the annular groove and the axial surface of the first ring.
[0020] In the radial fluid machine according to the invention, the radially inner limiting interface of the annular groove can be the radially outer surface of a second ring, which is part of the housing assembly. A bypass opening or bypass channel connecting the transition region from the first slit to the second slit to the low-pressure side of the radial fluid machine can be provided in the second ring. The bypass opening or bypass channel can be, in particular, a through-hole extending radially in the second ring.
[0021] The first bearing can be a radial sliding bearing. The bearing bushing of this sliding bearing can be part of the rotor assembly. Attached Figure Description
[0022] The invention will now be described in more detail with reference to the accompanying drawings. Here, it is shown that:
[0023] Figure 1 This is the longitudinal section of the radial pump according to the present invention. Detailed Implementation
[0024] The radial pump P shown has a housing assembly 1, a rotor assembly 2, and a control assembly 3.
[0025] The housing assembly 1 has a first housing portion 11, a second housing portion 12, a cover 13, a cover 14, and a stator 15 of an electric motor 15, 25 for a radial pump P.
[0026] A first housing portion 11 and a second housing portion 12 surround a first housing cavity, within which the rotor assembly 2 is rotatably arranged via a first bearing and a second bearing. The first housing cavity has a first region surrounded by a first region 1a of the housing assembly 1. The first region 2a of the rotor assembly is arranged within this first region 1a of the housing assembly 1. The second region 2b of the rotor assembly 2 is arranged within a second region of the housing cavity surrounded by a second region 1b of the housing assembly 1.
[0027] The first region 1a of the housing assembly is formed by a stator 15 and a portion of a first housing portion 11, in which the stator 15 is arranged in a surrounding outer recess. A first bearing component of the housing assembly 1 is constructed in this first region 1a, forming part of a first bearing. For this purpose, a first annular groove is formed in the axial wall of the first housing portion 11. Rolling elements or other bearing elements that facilitate rotation can be arranged in the first annular groove. The first annular groove is provided between the radially inward wall of the first region 1a of the housing assembly and the annulus 111.
[0028] The second region 1b of the housing assembly is substantially composed of a portion of the second housing part 12 and only a small portion of the first housing part 11. A second bearing component of the housing assembly 1 is constructed in this second region 1b, forming part of a second bearing. For this purpose, a second annular groove is constructed in the axial wall of the second housing part 12. Rolling elements or other bearing elements that facilitate rotation can be arranged in the second annular groove. The first and second annular grooves are located on opposite sides of the inner cavity of the first housing.
[0029] The second housing portion 12 has an inlet connector 121 on the low-pressure side and an outlet connector 122 on the high-pressure side, through which the medium pumped by the radial pump P flows into and out of the inner cavity of the first housing. The inlet connector 121 is connected to the inner cavity of the first housing via an inlet channel 123. The inner cavity of the first housing is connected to the outlet connector 122 via outlet channels 114, 124, 115, and 125. Here, the outlet channels 114, 124, 115, and 125 are formed by grooves 114 and 115 in the first housing portion 11 and grooves 124 and 125 in the second housing portion 12.
[0030] The rotor 2 has two components: an impeller 21 and the rotor 25 of the electric motors 15 and 25. The impeller 21 is a hollow shaft with its ends 212 and 213 forming rings, which are rotatably arranged in a first annular groove or a second annular groove of the housing assembly 1. The first ring 212 of the impeller embedded in the first annular groove forms a first bearing component of the rotor assembly 2, and the second ring 213 of the impeller embedded in the second annular groove forms a second bearing component of the rotor assembly 2. These, together with the first and second bearing components of the housing assembly, form a first or second bearing.
[0031] The first region 2a of the rotor assembly has a rotor 25 of the motor 15, 25. The rotor is inserted into a recess surrounding the outer side of the impeller 21.
[0032] The second region 2b of the rotor assembly 2 forms an impeller with impeller blades 211. An input channel 123 passes between the impeller blades 211 and into the center of this impeller. It forms the low-pressure side of the radial pump P.
[0033] By rotating the rotor assembly 2 and thus by rotating the impeller blades, the input medium is forced into the discharge channels 114, 124, 115, and 125. The pressure of the medium is thus increased. The discharge channels 114, 124, 115, and 125 are arranged on the high-pressure side of the radial pump P.
[0034] A first gap is provided between the first region 2a of the rotor assembly 2, including the first ring 212, and the first region 1a of the housing assembly 1, extending into a first annular groove. On the side opposite to the first annular groove, the first gap connects to the high-pressure side of the radial pump P, i.e., to at least one of the discharge channels 114, 124, 115, and 125.
[0035] A second gap is formed between the radially inner face of the first ring 212 and the radially inner limiting interface of the annular groove. The radially inner limiting interface of the annular groove is the radially outer face of the ring 111, which is part of the housing assembly and extends from the axial wall of the first housing portion 11. On the side opposite to the first annular groove, the second gap is connected to the low-pressure side of the radial pump, i.e., the center between the impeller blades 211, via a cavity in the impeller.
[0036] A transition region U is provided between the first gap S1 and the second gap S2, connecting the two gaps S1 and S2. The transition region U is formed between the axial limiting interface of the annular groove and the axial surface of the first ring 212.
[0037] The transition region U is not only connected to the low-pressure side of the radial pump P through the second gap S2, but also has a bypass channel provided in the ring 111 of the first housing portion. This bypass channel connects the transition region U to the low-pressure side of the radial pump P through the internal space of the impeller. The bypass channel has a larger cross-section than the second gap S2.
[0038] The control assembly 3 is arranged in the inner cavity of the second housing, which is enclosed by a part of the second housing portion 12, a cover 13 and a cap 14.
[0039] The control assembly 3 has a circuit board 31 on which various electrical structural elements 32 are arranged. These electrical structural elements 32 and the circuit traces on the circuit board 31 form a circuit that controls and supplies current to the motors 15 and 25. The radial pump has a device plug, a portion 131 of which is integrated into the cover 13. The electrical contacts of the device plug are connected to the circuit.
[0040] During the operation of the radial pump P, the impeller is driven, and thus the input medium is pumped to the discharge port 122. In the pumped medium, a secondary flow guided through the first slit S1 is diverted on the high-pressure side. This secondary flow is used to cool the electric motors 15 and 25. The secondary flow flows through the transition region U. A smaller portion flows from the transition region U through the second slit and is responsible for lubrication in the first bearing there. The larger portion of the secondary flow flows through a bypass opening at the second slit to the low-pressure side. This larger portion of the secondary flow entrains particles transported in the secondary flow and thus prevents these particles from depositing in the transition region U or the second slit and causing damage to the bearing.
[0041] List of reference numerals
[0042] P radial pump
[0043] 1. Housing assembly
[0044] 11 First shell section
[0045] 111 Ring of the first housing part
[0046] 1111 Bypass
[0047] 114 slots
[0048] 115 slots
[0049] 12 Second shell section
[0050] 121 Input Connector
[0051] 122 discharge connector
[0052] 123 Input Channel
[0053] 124 slots
[0054] 125 slot
[0055] 13 Coverings
[0056] 131 device plug
[0057] 14 Cover
[0058] 15 stators
[0059] 2 Rotor Assembly
[0060] 21 Impeller
[0061] 211 Impeller blades
[0062] 212 First Ring
[0063] 213 Second Ring
[0064] 25 rotors
[0065] 3 Control Components
[0066] 31 Circuit Board
[0067] 32 Structural Components
[0068] S1 First Gap
[0069] S2 Second Gap
[0070] U Transition Region
Claims
1. A radial fluid machine, the radial fluid machine having cooling and lubrication by a medium flowing through the machine, wherein, The medium flows from the high-pressure side to the low-pressure side of the radial fluid machine. The radial fluid machine has a housing assembly (1) and a rotor assembly (2) rotatably supported in the internal space of the housing assembly (1). In order to support the rotor assembly (2) in the housing assembly (1), at least one first bearing is provided. The rotor assembly (2) includes the rotor (25) and impeller (21) of the electric motor (15, 25). The motor (15, 25) includes a stator (15) in addition to the rotor (25), and the stator is part of the housing assembly (1). The rotor (25) of the motor (15, 25) is arranged in the first region (2a) of the rotor assembly (2), and the stator (15) is arranged in the first region (1a) of the housing assembly (1). The first region (1a) of the housing assembly (1) surrounds the first region (2a) of the rotor assembly (2). A distance is provided between the first region (1a) of the housing assembly (1) and the first region (2a) of the rotor assembly (2), the distance forming a first gap (S1). The first gap is connected to the high-pressure side of the radial fluid machine on one side and to the low-pressure side of the radial fluid machine on the other side, so that a secondary flow of the medium flowing through the radial fluid machine during operation flows through the first gap (S1) and heat is discharged from the rotor (25) and / or stator (15) of the motor (15, 25). The first bearing has a second gap (S2), which is disposed between the first bearing component of the rotor assembly (2) and the first bearing component of the housing assembly (1). The first gap (S1) is connected to the second gap (S2) on either the low-pressure side or the high-pressure side, such that a portion of the medium flowing through the radial fluid machine during operation flows through the second gap (S2) and is responsible for lubricating the first bearing there. Its features are, A bypass opening or bypass channel (1111) is provided in the transition region (U) from the first slit (S1) to the second slit (S2), and each of the bypass openings or bypass channels connects the transition region (U) to the low-pressure side of the radial fluid machine, such that only a portion of the medium flowing through the first slit (S1) during the operation of the radial fluid machine also flows through the second slit (S2). The first bearing component of the housing assembly is formed by a first annular groove, and the first bearing component of the rotor assembly is formed by a first ring, which is embedded in the first annular groove and is part of the rotor assembly (2).
2. The radial fluid machine according to claim 1, characterized in that, Each bypass opening or each bypass channel (1111) has a minimum cross-section, and the length and width or diameter of at least one of the minimum cross-sections is greater than the distance between the first region (1a) of the housing assembly and the first region (2a) of the rotor assembly in the region of the second gap (S2).
3. The radial fluid machine according to claim 1 or 2, characterized in that, The sum of the minimum cross-sectional areas of each of the bypass openings or bypass channels (1111) is greater than the minimum cross-sectional area of the second gap (S2).
4. The radial fluid machine according to claim 1 or 2, characterized in that, The radial fluid machine is a radial fluid working machine.
5. The radial fluid machine according to claim 1 or 2, characterized in that, The radial fluid machine is a radial pump.
6. The radial fluid machine according to claim 1 or 2, characterized in that, A portion of the first gap (S1) is formed between the radially outer limiting interface of the first annular groove and the radially outer surface of the first ring.
7. The radial fluid machine according to claim 1 or 2, characterized in that, The second gap (S2) is formed between the radially inner limiting interface of the first annular groove and the radially inner surface of the first ring.
8. The radial fluid machine according to claim 1 or 2, characterized in that, The transition region (U) from the first slit (S1) to the second slit (S2) is formed between the axial limiting interface of the first annular groove and the axial surface of the first ring.
9. The radial fluid machine according to claim 7, characterized in that, The radially inner limiting interface of the first annular groove is the radially outer surface of the ring (111), which is part of the housing assembly (1).
10. The radial fluid machine according to claim 9, characterized in that, Each of the bypass openings or bypass channels (1111) is disposed in the ring (111) of the housing assembly (1), and the bypass openings or bypass channels connect the transition area (U) from the first slit (S1) to the second slit (S2) to the low-pressure side of the radial fluid machine.
11. The radial fluid machine according to claim 10, characterized in that, Each of the bypass openings or bypass channels (1111) is a through hole extending radially in the ring (111) of the housing assembly (1).