JP5103362B2 - Liquid cooling motor - Google Patents

Description

  The present invention relates to a liquid cooling motor having a casing structure that can be cooled by a cooling liquid.

  Patent Document 1 discloses a liquid cooling motor having a casing structure that can be cooled by a cooling liquid.

  The first cooling structure of the liquid cooling motor disclosed in Patent Document 1 includes an inlet-side annular flow path having an inlet through which coolant flows and an outlet-side annular having an outlet from which coolant flows out. The inlet side annular channel and the outlet side annular channel are connected by a plurality of connecting channels provided along the axial direction of the liquid cooling motor.

  On the other hand, the same patent document 1 discloses a second cooling structure different from the first cooling structure. In the second cooling structure, as shown in the developed cross section in FIG. 4, at the intermediate position of the junction 16 between the first annular flow path 10 and each connection flow path 14 of the second annular flow path 12, The phase is shifted between the entry side and the exit side, and every other bolt 18 is arranged. The bolt 18 functions as a damming portion in each of the annular channels 10 and 12. Due to the presence of the bolts 18, the coolant flowing in from the inlet 20 sequentially reciprocates between the first annular channel 10 and the second annular channel 12 and passes through all the connected channels 14. It flows out from the outflow port 22.

Japanese Patent No. 3435802

  However, in the first cooling structure, the movement of the cooling liquid between the inlet and the outlet is completely free, and thus the first cooling structure tends to easily pass through the shortest flow path from the inlet to the outlet. In some cases, the uniformity cannot be maintained, and in order to spread the cooling liquid throughout, it is necessary to secure a corresponding pump capacity.

  In the second cooling structure, the coolant reciprocates many times while changing the direction by 180 degrees between the inlet side annular channel and the outlet side annular channel, and after passing through all the connected channels. Therefore, there is a problem that the pressure loss (pressure loss) of the coolant increases. Therefore, in the case of a cooling system in which not only a motor but also a driver controller for driving the motor needs to be cooled by the same cooling flow path, such as a drive device such as a hybrid construction machine, the Since the construction of the entire cooling system is difficult, there has been a more basic problem that it is virtually impossible to adopt.

  The present invention has been made to solve such a conventional problem, and can improve the uniformity of the cooling of the motor without increasing the pump capacity, and the pressure loss of the coolant can be minimized. The subject is to provide a liquid cooling motor.

  The present invention relates to a liquid cooling motor having a casing structure that can be cooled by a cooling liquid, an inlet-side annular flow path having one inlet through which the cooling liquid flows, and one flow from which the cooling liquid flows out. A plurality of outlet-side annular channels provided with an outlet, and an inlet-side annular channel between the inlet-side and outlet-side annular channels along the axial direction of the liquid cooling motor, the inlet-side annular channel from the inlet-side annular channel A connecting flow path for flowing the cooling liquid to the inlet, one inlet damming portion for blocking the flow of the cooling liquid flowing in the inlet-side annular flow path, and the cooling liquid flowing in the outlet-side annular flow path One exit-side damming portion for damming the flow, from the confluence point of the connection channel close to the inlet in the inlet-side annular channel to the outlet-side annular channel side of the connection channel The flow path to the outlet is from the inlet to the connecting flow path in the inlet-side annular flow path. Distance to be longer than, by arranging the entering-side blocking unit and the exit-side blocking unit is obtained by solving the above problems.

  In the present invention, each of the inlet-side and outlet-side annular channels is provided with one inlet-side damming portion and one outlet-side damming portion that dams the flow of the coolant flowing in the respective annular channels. And the flow path from the confluence point to the outlet-side annular flow path side of the connection flow path close to the inlet in the inlet-side annular flow path among the connection flow paths is the inlet-side annular flow The entry-side damming portion and the exit-side damming portion are arranged so as to be longer than the distance from the inflow port to the connection flow channel in the path. For this reason, the coolant in each specific annular flow path can receive an appropriate reaction force from each damming portion, and the coolant passing through the specific connection flow path can be connected to another connection flow. Compared to the coolant that has passed through the channel, it does not flow out at an early stage just by passing through an extremely short channel. Therefore, as a result, the cooling liquid spreads over the connecting flow channel located far from the inlet, and it is easy to obtain the uniformity of the pressure of the cooling liquid in each annular flow channel. This point will be described in detail later.

  In addition, the cooling liquid travels in parallel in a single direction from the input-side annular flow path to the output-side annular flow path in all the connection flow paths, so that the pressure loss in the entire liquid cooling motor is extremely small. For this reason, the present invention requires that not only the motor but also the driver controller for driving the motor be cooled in the same cooling flow path as in the cooling system of the drive device of the hybrid construction machine, for example. It works particularly effectively when used in cooling systems. Of course, the characteristic that the pressure loss is small provides an effect that the capacity of the circulation pump and the radiator for circulating the cooling liquid can be reduced even when only the liquid cooling motor is cooled alone.

  According to the present invention, it is possible to obtain a liquid cooling motor capable of improving the uniformity of cooling without increasing the pump capacity and suppressing the pressure loss of the coolant as small as possible.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view focusing on a cooling system of a liquid cooling motor according to an example of an embodiment of the present invention, FIG. 2 is a front view of an upper fracture of the liquid cooling motor, and FIGS. 3 (A) and 3 (B) are FIG. 3 is a cross-sectional view taken along lines IIIA-IIIA and IIIB-IIIB in FIG. 2, respectively.

  The liquid cooling motor 70 has a casing structure that can be cooled by a cooling liquid, and includes an inlet-side annular channel 72, an outlet-side annular channel 74, and a connecting channel 76. The inlet-side annular flow path 72 includes one inflow port 78 into which the coolant flows. The outlet-side annular channel 74 includes one outlet 80 through which the coolant flows. A plurality of connection channels 76 (12 in this example, 76a to 76l) are provided between the inlet-side annular channel 72 and the outlet-side annular channel 74 along the axial direction of the liquid cooling motor 70. The cooling liquid is configured to flow from the annular channel 72 to the outlet-side annular channel 74 (in parallel with a single direction).

  The inlet-side annular flow path 72 is formed in a ring shape around the inside of the motor casing 88 in the vicinity of the end on the one end side in the axial direction of the motor casing 88. The inlet-side annular flow path 72 is provided with one inlet-side damming portion 82 that dams the flow of the coolant flowing through the inlet-side annular flow path 72 (see FIG. 3). Since the inlet-side annular flow path 72 is located on the upstream side in the cooling flow path of the liquid cooling motor 70, it is arranged on the side where higher cooling performance is required in the liquid cooling motor 70. Is preferred. In this embodiment, the inlet-side annular flow path 72 is disposed on the side where a sensor such as a resolver (or encoder) 86 is provided. As shown in FIGS. 2 and 3A, the inlet-side annular flow path 72 is connected to an inflow port 78 formed of a right angle elbow. The inflow port 78 is configured such that the cooling liquid flows in from a substantially tangential direction X1 (of the ingress side annular channel 72) with the inflow junction 72A from the inflow port 78 to the ingress side annular channel 72 as a contact. Has been. The term “tangential direction” does not necessarily require a geometrically strict tangential direction.

  The exit-side annular flow path 74 is formed in a ring shape around the inside of the motor casing 88 in the vicinity of the end portion on the opposite side in the axial direction of the entry-side annular flow path 72 in the motor casing 88. The exit-side annular flow path 74 is also provided with one exit-side damming portion 84 that dams the flow of the coolant flowing through the exit-side annular flow path 74. Note that the phases of the inlet-side damming portion 82 and the inlet 78 in the inlet-side annular channel 72 are different from the phases of the outlet-side damming portion 84 and the outlet 80 in the outlet-side annular channel 74. This is because the flow path from the confluence point to the outlet-side annular flow path side of the connection flow path close to the inlet in the inlet-side annular flow path among the connection flow paths is the inlet-side annular flow. This is because the entry-side damming portion and the exit-side damming portion are arranged so as to be longer than the distance from the inflow port to the connection channel in the path. This configuration will be described in detail later.

  As shown in FIG. 2 and FIG. 3 (B), the outlet-side annular flow path 74 is connected to an outlet 80 formed of a right angle elbow. The outlet 80 is configured such that the coolant flows out from the substantially tangential direction X2 (of the outlet-side annular channel 74) with the outlet branch point 74A from the outlet-side annular channel 74 to the outlet 80 as a contact. Has been.

  A plurality (twelve in this embodiment) of the connection flow paths 76 are arranged along the axial direction between the input and output side annular flow paths 72 and 74. In this embodiment, the cross section is formed by a circular pipe for the purpose of reducing manufacturing ease and pressure loss as much as possible. However, in order to increase cooling efficiency, an elliptical or flattened cross section is used. You may make it form with the pipe which has.

  In this embodiment, both the inlet side damming portion 82 and the outlet side damming portion 84 are separated from the motor casing 88 by the motor casing 88 forming the inlet side annular channel 72 and the outlet side annular channel 74. It is integrally formed. However, in the present invention, there is no particular limitation on the specific configuration (in each annular flow path) for forming the inlet damming portion 82 and the outlet damming portion 84. For example, the inlet-side annular channel and the outlet-side annular channel are completely “connected annular channels”, and a bolt (not shown) is engaged and arranged from the outside of the annular channel (for example, radially outside). By doing so, you may make it form an entrance and exit side damming part. The formation of the damming portion by engaging and arranging the bolts is excellent in that it can be easily manufactured. On the other hand, the method of forming integrally with the casing 88 as in the present embodiment is excellent in that the coolant in the annular channel can be completely dammed without leakage.

  Here, more specific configurations of the inlet-side annular flow path 72, the outlet-side annular flow path 74, and the connection flow path 76 of the liquid cooling motor 70 will be described in detail using two cross-sectional views shown in FIG. To do.

  3A is a cross-sectional view of the inlet-side annular flow path 72 as viewed from the direction of arrows IIIA-IIIA in FIG. 2, and FIG. 3B is a cross-sectional view of the outlet-side annular flow path 74 as indicated by arrows IIIB- in FIG. It is sectional drawing seen from the IIIB direction. As is apparent from the depiction in FIG. 3, in this embodiment, the position of the inlet 78 and the inlet damming portion 82 in the inlet-side annular channel 72, and the outlet 80 and outlet-side dam in the outlet-side annular channel 74. The stop portion 84 is located at substantially the same position when viewing the inlet-side annular flow path 72 and the outlet-side annular flow path 74 from the axially opposite load side of the liquid cooling motor 70, that is, 4 o'clock in terms of a watch. And 5 o'clock.

  However, the (circumferential) phase of the inlet 78 and the inlet damming portion 82 in the inlet-side annular flow path 72 and the (circumferential) of the outlet 80 and the outlet-side damming portion 84 in the outlet-side annular flow path 74. The phase is reversed. In terms of timepieces, in the inlet-side annular flow path 72, the inflow port 78 is located on the side of the time later than the inlet-side damming portion 80, but in the outlet-side annular flow path 74, the outlet 80 is It is located on the side where the time is earlier than the exit side damming portion 84.

  Therefore, for example, the coolant that reaches the confluence on the outlet side annular channel 74 through the connecting channel near the inlet 78 in the inlet side annular channel, for example, 76a, 76b, 76c,. After flowing through the flow path 74 almost once, it flows out. That is, the flow path from the junction point to the outlet 80 flows out through the outlet 80 through a flow path set longer than the distance from the inlet 78 to the connecting flow path. In other words, the connection channels 76 a, 76 b, 76 c,..., Etc. near the inlet 78 of the inlet-side annular channel 72 flow in the outlet-side annular channel 74 (near the outlet-side damming portion 84). That is, it is located far from the exit 80.

  In the present invention, “near” and “far” are not a simple three-dimensional distance, but are used to mean “near” or “far” in terms of whether the channel distance in the annular channel is long or short. Yes.

  In addition, since the connection flow path 76 which concerns on this embodiment is linear, and there exists a clearance gap between one by one, wiring (illustration) for driving the said liquid cooling motor 70 using this clearance gap is shown. A total of four through-holes 93 to 96 for passing (U-phase through-hole 93, V-phase through-hole 94, W-phase through-hole 95, and thermistor through-hole 96), It is formed between the entrance-side annular flow path and the exit-side annular flow path and at a position where the plurality of connection flow paths are not formed, and the wiring is drawn out through the through holes 93 to 96. Yes.

  The cooling liquid flowing out from the liquid cooling motor 70 is sent to a radiator through a cooling channel (not shown), where heat is exchanged to lower the temperature, and a cooling pump (both not shown) is used. The liquid is again sent to the liquid cooling motor 70 at a predetermined pressure.

  Next, the operation of the liquid cooling motor 70 will be described.

  When a cooling pump (not shown) rotates, the coolant reaches the inlet 78 of the inlet-side annular flow path 72 of the liquid cooling motor 70, and enters the inlet-side annular flow path 72 from a substantially tangential direction of the inlet-side annular flow path 72. It flows toward the inflow confluence 72A. Therefore, the cooling liquid can easily spread over the entire (circumferential) entire inlet side annular flow path 72 and can receive an appropriate reaction force from the inlet side damming portion 82. The hydraulic pressure in 72 is uniformly made uniform.

  Further, in this embodiment, the positions of the inlet 78 and the inlet damming portion 82 (circumferential direction) in the inlet-side annular flow path 72, and the outlet 80 and the outlet-side damming portion in the outlet-side annular flow path 74. 84 (circumferential direction) is set to be substantially the same, and the phase of the inlet damming portion 82 with respect to the inlet 78 is opposite to the outlet 80 of the outlet damming portion 84.

  Therefore, for example, the coolant that reaches the confluence on the outlet side annular channel 74 through the connecting channel near the inlet 78 in the inlet side annular channel, for example, 76a, 76b, 76c,. After flowing around the flow path 74 almost once, it flows out through the outlet 80.

  In addition, due to this arrangement relationship, the connection flow paths 76 a, 76 b, 76 c and the like close to the inflow port 78 have a high inflow pressure from the inflow port 78. Thus, a state is formed in which the “inflow reaction force into the connection flow path 76” from the 74 side is more strongly applied. That is, (from the viewpoint of the magnitude of the inflow reaction force), the connection flow paths 76a, 76b, 76c and the like close to the inflow port 78 are cooled by the connection flow paths 76j, 76k, 76l and the like far from the inflow port 78. The liquid is difficult to flow into the connecting flow path 76 (from the inlet-side annular flow path 72). As a result of these synergistic actions, the cooling liquid flows at a substantially equalized flow rate in all the connection flow paths 76, and the entire liquid cooling motor 70 can be cooled uniformly.

  Note that only the connecting flow path 76l is exceptionally positioned at a position farthest from the outlet 80, although it is farthest from the inlet 78. Therefore, although the flow seems to be very slow at first glance, this connecting flow path 76l is closest to the inlet-side damming portion 82 of the inlet-side annular channel 72, and a strong stop reaction force is generated from the damming portion 82. Therefore, the flow rate tends to increase rather than the other connection flow paths 76a to 76k, and the problem of insufficient flow rate does not occur.

  The cooling liquid moves in parallel in a single direction in all the connected flow paths 76 from the input-side annular flow path 72 side to the output-side annular flow path 74 side. Therefore, coupled with the action of the coolant flowing in from the tangential direction to the inlet-side annular flow path 72 and flowing out from the tangential direction of the outlet-side annular flow path 74, the pressure loss of the coolant in the entire liquid cooling motor 70 (Pressure loss) is extremely small. Accordingly, for example, when a plurality of liquid cooling motors are used in one parent machine as in a geared motor cooling system of a complicated machine tool, or as in a generator motor cooling system of a hybrid construction machine, a liquid cooling motor is used. In addition to the above, the liquid cooling motor (70) used in a situation where a large pressure loss in each liquid cooling motor causes a great disadvantage, such as when the driver controller must be cooled. ) Especially effective for cooling.

  In general, when a cooling flow path for cooling the electric motor is formed in the casing, it is often very difficult to secure a wiring space that needs to penetrate the inside and outside of the casing. Since the connecting flow path 76 is linear and has a gap between each one, through holes (wiring spaces) 93 through which wiring for driving the liquid cooling motor 70 is made using this gap. Since 96 is secured, it is not necessary to expand the axial space only to secure the wiring space, and the axial length of the liquid cooling motor 70 can be shortened accordingly.

  In the above embodiment, an example in which twelve connection channels 76 having a circular cross section are formed is shown. However, in the present invention, the shape and number of connection channels are not particularly limited. A connecting channel having a circular cross section has less pressure loss than a non-circular connecting channel. Since the noncircular connecting flow path has a large surface area with respect to the motor (if it is the same number), more efficient cooling can be performed. As the number of connection channels increases (if the cross-sectional area of each connection channel is secured to some extent), the pressure loss decreases and the cooling efficiency tends to increase. Note that the intervals in the circumferential direction of the connection flow path may not be equal.

  The phase of the inlet side damming portion and the inflow port in the inlet side annular channel (position and order of formation in the circumferential direction), and the phase of the outlet side damming unit and the outlet in the outlet side annular channel are only It is a preferred example, in short, qualitatively, the flow path from the junction point to the outlet side annular flow path side of the connection flow path close to the flow inlet in the input side circular flow path of the connection flow paths is the input side. If the inlet side damming portion and the outlet side damming portion are arranged so as to be longer than the distance from the inflow port to the connection flow channel in the annular flow channel, the above effect of the present invention is correspondingly achieved. Obtainable.

  In particular, since the entire liquid cooling motor 70 can be cooled evenly and with a small pressure loss, it is particularly necessary to cool not only a machine tool or motor that uses a plurality of liquid cooling motors but also a driver controller. A very good effect can be obtained in a cooling system for a drive device of a construction machine.

Sectional drawing which paid its attention to the cooling system of the liquid cooling motor which concerns on an example of embodiment of this invention Front view of the top break of the liquid cooling motor (A) is the arrow IIIA-IIIA line of FIG. 2, (B) is sectional drawing which follows the IIIB-IIIB line Expanded sectional view showing an example of a conventional cooling system

Explanation of symbols

DESCRIPTION OF SYMBOLS 70 ... Liquid cooling motor 72 ... Inlet side annular flow path 72A ... Inflow confluence 74 ... Outlet side annular flow path 74A ... Outflow branch point 76 (76a-76l) ... Connection flow path 78 ... Inlet 80 ... Outlet 82 ... In Side damming part 84 ... Outside damming part 88 ... Motor casing

Claims (6)

In a liquid cooling motor having a casing structure that can be cooled by a cooling liquid,
An inlet-side annular flow path having one inlet through which the coolant flows;
An outlet-side annular flow path having one outlet through which the coolant flows out;
A plurality of connection flow paths are provided between the inlet-side and outlet-side annular flow paths along the axial direction of the liquid-cooling motor, and a flow path for flowing the coolant from the inlet-side annular flow path to the outlet-side annular flow path;
One inlet-side damming portion for damming the flow of the coolant flowing in the inlet-side annular flow path;
A single outlet damming portion for blocking the flow of the coolant flowing in the outlet annular channel;
Of the connection channels, a channel from the junction point to the outlet side annular channel side of the connection channel close to the inlet in the inlet side annular channel to the outlet is the inlet channel in the inlet side annular channel. The liquid cooling motor, wherein the inlet side damming portion and the outlet side damming portion are disposed so as to be longer than a distance from the inflow port to the connection flow path. In claim 1,
The phase of the inlet side damming portion in the inlet-side annular channel with respect to the inlet is opposite to the phase of the outlet-side damming portion in the outlet-side annular channel with respect to the outlet. Cold motor. In claim 1 or 2,
The inflow port is formed so that the coolant flows in from a substantially tangential direction of the input side annular flow channel with the inflow confluence as the contact point from the flow inlet to the input side circular flow channel. Liquid cooling motor. In any one of Claims 1-3,
The outlet is formed so that the coolant flows out from a substantially tangential direction of the outlet-side annular flow path with the outflow branch point from the outlet-side annular flow path to the outlet as a contact. Liquid cooling motor. In any one of Claims 1-4,
The liquid cooling, wherein the inlet side damming portion and the outlet side damming portion are integrally formed with the casing by a casing forming the inlet side annular channel and the outlet side annular channel. motor. In any one of Claims 1-5,
The liquid cooling motor wiring is drawn between a position where the plurality of connection flow paths are not formed between the input-side annular flow path and the output-side annular flow path. Cold motor.

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