JP2013051830A - Cooling pipe with adjusting valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling pipe that achieves uniform discharge flow rate of a cooling medium from a plurality of discharge ports regardless of the flow direction of the cooling medium.SOLUTION: A rotary electric machine includes a rotating shaft 14, a rotor 16, and a stator 18. In a rotary electric machine cooling system 10, the rotating shaft 14, the rotor 16, and the stator 18 are arranged inside a motor case 12. Also, a cooling medium pump 24, a cooling medium supply pipe 26, a cooling pipe 30 with adjusting valves, and a terminal end plate 28 are provided for cooling coil ends 20 and 22 of the stator 18. The adjusting valves 50 and 60 in the cooling pipe 30 have: respective flat portions that are guided by respective slide grooves 34 and 36; and respective receiving plates 52 and 62 that are provided vertically on the respective flat portions and receive flow of a cooling medium. The flat portions are provided with: respective small holes 54 and 64 with smaller opening areas; and respective large holes 56 and 66, with larger opening areas, that are arranged across the respective receiving plates 52 and 62 from the respective small holes 54 and 64.

Description

  The present invention relates to a cooling pipe with an adjustment valve, and an adjustment valve having an adjustment valve for adjusting a discharge flow rate from each refrigerant discharge port in a cooling pipe in which a plurality of refrigerant discharge ports for discharging a refrigerant are provided along the longitudinal direction. It relates to the attached cooling pipe.

  When the rotating electrical machine operates, the winding coil generates heat and a temperature rise occurs, thereby changing the performance. Therefore, a cooling pipe having a plurality of refrigerant discharge ports is provided, and the refrigerant is supplied to the cooling pipe, and the refrigerant is discharged from the refrigerant discharge port toward the winding coil or the like.

  For example, in Patent Document 1, as a cooling device that supplies cooling refrigerant to both coil ends formed on both sides of a stator core of a rotating electrical machine, a cooling oil pipe is disposed along the rotation axis above the stator core and both coil ends. In addition, a configuration is described in which discharge holes for discharging cooling oil are provided in both coil ends. Here, it is disclosed that the upstream discharge hole of the cooling oil pipe has a larger opening area than the downstream discharge hole that is a dead end.

  Patent Document 2 describes that a cooling circuit for a motor, which is provided separately from the motor case and has a cooling oil injection unit above the coil end, is described. The cooling circuit is composed of a plurality of cooling oil passages connected in an upward convex circumferential groove and extending in the axial direction. The cooling oil passage is provided with a cooling oil injection section, and the cooling oil is supplied to the convex circumferential groove. At the top of the center. Thus, it is stated that even if the flow rate of the cooling oil is small, it is possible to prevent the cooling oil from being sufficiently spread over the plurality of cooling oil passages, and to be prevented from dripping downward through the motor case without being injected. ing.

JP 2006-115650 A JP-A-8-130856

  If a plurality of refrigerant discharge ports are provided in the longitudinal direction of the cooling pipe, the refrigerant discharge amount from the respective refrigerant discharge ports may not be uniform because the pressure or flow velocity of the refrigerant flowing through the cooling pipe varies along the longitudinal direction. . As a countermeasure, as disclosed in Patent Document 1, for example, it is conceivable to increase the opening area of the discharge port on the upstream side of the flow and decrease the opening area of the discharge port on the downstream side.

  However, if the upstream side and the downstream side of the flow are distinguished from each other and the size of the opening area of the discharge port is set accordingly, the flow direction in the cooling pipe is determined. That is, it becomes a special pipe that cannot flow the refrigerant in the opposite direction, which is inconvenient. For example, when a cooling pipe is prepared alone, when it is installed in a rotating electrical machine, one end side and the other end side of the cooling pipe need to be distinguished and matched with the flow direction of the refrigerant.

  An object of the present invention is to provide a cooling pipe with an adjustment valve that can make the discharge flow rate from a plurality of discharge ports uniform regardless of the flow direction of the refrigerant.

  The cooling pipe with adjustment valve according to the present invention is a cooling pipe in which a plurality of refrigerant discharge ports for discharging a refrigerant are provided along the longitudinal direction, and a plurality of adjustment valves provided in each of the plurality of discharge ports. In accordance with the flow direction of the refrigerant, the adjustment amount for the refrigerant flow is changed in conjunction with the refrigerant flow so as to suppress the difference between the discharge flow rate at the inlet outlet and the outlet flow rate at the rear outlet. A plurality of regulating valves.

  In the cooling pipe with adjustment valve according to the present invention, each of the plurality of adjustment valves has a receiving plate that receives the flow of the refrigerant, and moves according to the direction of the flow of the refrigerant. Is preferably changed automatically.

  Further, in the cooling pipe with adjustment valve according to the present invention, the plurality of adjustment valves are arranged along the flow of the refrigerant, have large and small holes having different flow passage cross-sectional areas, and flow passages to the discharge port having a high refrigerant pressure It is preferable that a hole having a small cross-sectional area is disposed, and a hole having a large channel cross-sectional area is disposed at an outlet having a low refrigerant pressure.

  In the cooling pipe with regulating valve according to the present invention, the plurality of regulating valves have large and small throttle portions that are arranged along the flow of the refrigerant and have different throttle amounts, and the throttle amount is large at the discharge port having a high refrigerant pressure. It is preferable that a throttle is disposed, and a throttle with a small throttle amount is disposed at an outlet having a low refrigerant pressure.

  With the above configuration, the cooling pipe with a regulating valve is configured to suppress the difference between the discharge flow rate of the discharge port on the inlet side and the discharge flow rate of the discharge port on the back side according to the flow direction of the refrigerant. A plurality of adjustment valves are provided in which adjustment amounts for the refrigerant flow are changed in conjunction. Thereby, irrespective of the flow direction of the refrigerant, the discharge flow rate from the plurality of discharge ports can be made uniform.

  Further, in the cooling pipe with adjustment valve, each of the plurality of adjustment valves has a receiving plate that receives the flow of the refrigerant, and moves according to the direction of the flow of the refrigerant. Will be changed. Accordingly, the discharge flow rates from the plurality of discharge ports can be automatically made uniform regardless of the refrigerant flow direction.

  In the cooling pipe with regulating valve, the plurality of regulating valves are arranged with large and small holes having different flow path cross-sectional areas along the refrigerant flow. And a hole with a small channel cross-sectional area is arrange | positioned at the discharge outlet with a high refrigerant | coolant pressure, and a hole with a large channel cross-sectional area is arrange | positioned at the discharge outlet with a low refrigerant | coolant pressure. Thus, even if the refrigerant pressure varies along the longitudinal direction of the cooling pipe, the discharge flow rates from the plurality of discharge ports can be automatically made uniform regardless of the refrigerant flow direction.

  In the cooling pipe with adjustment valve, the plurality of adjustment valves are provided with large and small throttle portions having different throttle amounts along the refrigerant flow. A throttle with a large throttle amount is arranged at the discharge port with a high refrigerant pressure, and a throttle with a small throttle amount is arranged at the discharge port with a low refrigerant pressure. Thus, even if the refrigerant pressure varies along the longitudinal direction of the cooling pipe, the discharge flow rates from the plurality of discharge ports can be automatically made uniform regardless of the refrigerant flow direction.

It is a figure which shows the structure of the rotary electric machine cooling system to which the cooling pipe with a regulating valve of embodiment which concerns on this invention is applied. In embodiment which concerns on this invention, it is a figure which shows the initial state of a cooling pipe with a regulating valve. In FIG. 2, it is a figure explaining the effect | action of a regulating valve when a refrigerant | coolant is supplied from the left side of a paper surface. In FIG. 2, it is a figure explaining the effect | action of a regulating valve when a refrigerant | coolant is supplied from the right side of a paper surface.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, the case where the cooling pipe with a regulating valve is used for cooling the coil end of the stator of the rotating electrical machine will be described. However, this is an illustrative example and may be used for other cooling purposes. In the following, a linearly extending cooling pipe with a regulating valve will be described, but this is also an example for explanation, and a cooling pipe appropriately bent according to the shape of the object to be cooled may be used. In the following, a case where the number of regulating valves is two will be described. However, this is an illustrative example, and may be three or more. Moreover, the opening shape of the regulating valve, the shape of the receiving plate, and the like described below are examples for explanation, and can be appropriately changed.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram showing a configuration of a rotating electrical machine cooling system 10 in which a cooling pipe 30 with a regulating valve is arranged. In the rotating electrical machine cooling system 10, a rotating shaft 14 that constitutes the rotating electrical machine, a rotor 16 that is a rotor, and a stator 18 that is a stator are arranged in a motor case 12, and the coil ends 20 and 22 of the stator 18 are cooled. For this purpose, a refrigerant pump 24, a refrigerant supply pipe 26, a cooling pipe 30 with a regulating valve, and a termination plate 28 are further provided.

  The rotating electrical machine generates a rotating magnetic field by energizing the winding coil wound around the stator 18, and generates a rotating torque in cooperation with the magnets of the rotor 16. The fixed rotating shaft 14 is rotated. The coil ends 20 and 22 are portions of a winding coil wound around the stator 18, and are portions protruding to both end sides in the axial direction of the stator 18.

  Since the winding coil generates heat by energizing the winding coil of the stator 18 and the temperature of the winding coil and the stator 18 rises, the refrigerant pump 24 is used to cool the coil ends 20 and 22 in particular. Is a pump having a function of supplying the coil ends 20 and 22 to the coil ends.

  As the refrigerant, lubricating oil used for lubricating the rotating electrical machine is also used as cooling oil. Specifically, the lubricating oil accumulated at the bottom of the motor case 12 is pumped up by the refrigerant pump 24 and supplied to the cooling pipe 30 with the adjusting valve via the refrigerant supply pipe 26. Since the end of the cooling pipe 30 with the regulating valve is closed by the end plate 28, the supplied lubricating oil stops there. Since the discharge pipes 38 and 40 are provided in the cooling pipe 30 with the adjusting valve, the lubricating oil is discharged from the discharge openings 38 and 40, cools the coil ends 20 and 22, and returns to the bottom of the motor case 12. The returned lubricating oil is pumped up again by the refrigerant pump 24. In this way, the lubricating oil also acts as cooling oil and circulates in the motor case 12. In the following, the lubricating oil / cooling oil will be described simply as a refrigerant.

  The adjusting valve-equipped cooling pipe 30 includes a pipe 32 and two adjusting valves 50 and 60. The adjusting valve-equipped cooling pipe 30 is disposed inside the motor case 12 and above the stator 18. The upper part is the upper part with respect to the direction of gravity. The bottom of the motor case 12 where the refrigerant accumulates is the lower part, and the upper part indicates the position relative to this. Therefore, the refrigerant supplied to and discharged from the upper part receives the action of gravity and falls toward the lower part.

  The pipe 32 is a pipe in which one end 42 side is connected to the refrigerant pump 24 via the refrigerant supply pipe 26 and the other end 44 side is closed by the end plate 28 so that the refrigerant flows. The pipe 32 may be a circular pipe, a square pipe, or a pipe having another cross-sectional shape.

  The discharge ports 38 and 40 provided in the pipe 32 are refrigerant discharge ports for discharging the refrigerant flowing through the pipe 32 toward the coil ends 20 and 22. The discharge ports 38 and 40 are arranged at positions corresponding to the arrangement positions of the coil ends 20 and 22 at both ends in the axial direction of the stator 18 so that the openings are directed downward. The discharge opening areas of the discharge ports 38 and 40 are set to the same size.

  The slide grooves 34 and 36 provided in the pipe 32 correspond to the discharge ports 38 and 40, respectively, and are guide grooves that the adjustment valves 50 and 60 guide so as to be movable in the longitudinal direction of the pipe 32. That is, the slide groove 34 is provided at the discharge port 38 and guides the adjustment valve 50 to move along the longitudinal direction of the pipe 32 before and after the position where the discharge port 38 is disposed. Similarly, the slide groove 36 is provided at the discharge port 40 and guides the adjustment valve 60 to move along the longitudinal direction of the pipe 32 before and after the position where the discharge port 40 is disposed.

  The adjustment valves 50 and 60 are arranged in the slide grooves 34 and 36 of the pipe 32, respectively, and move according to the direction of the refrigerant flow. By the movement, the adjustment amount for the refrigerant flow with respect to the discharge ports 38 and 40 is changed. It is a flow adjusting plate.

  The adjustment valves 50 and 60 have basically the same shape, and are different from each other in the arrangement relationship that is reversed in the front-rear direction when arranged in the slide grooves 34 and 36. The adjusting valve 50 will be described. The adjusting valve 50 includes a flat plate portion guided by the slide groove 34 and a receiving plate 52 that is provided in a vertical direction on the flat plate portion and receives the flow of the refrigerant. The flat plate portion is provided with a small hole 54 having a small opening area and a large hole 56 having an opening area larger than the small hole 54 with the receiving plate 52 interposed therebetween. Similarly, the adjustment valve 60 has a receiving plate 62, a small hole 64, and a large hole 66.

  When the regulating valve 50 is disposed in the slide groove 34, the large hole 56 is arranged on the one end 42 side of the pipe 32, and when the regulating valve 60 is disposed in the slide groove 36, the large hole 66 is It is made to be on the other end 44 side of the pipe 32. That is, when the adjusting valve having the receiving plate, the large hole, and the small hole is disposed on the one end 42 side of the pipe 32 in the same manner, the large hole is adjusted to be on the one end 42 side. When the valve 50 is arranged on the side of the other end 44 of the pipe 32, the large hole is arranged on the side of the other end 44 to become the regulating valve 60.

  FIG. 2 is a view showing an initial state of the adjusting valve-equipped cooling pipe 30 extracted. The large holes 56 and 66 and the small holes 54 and 64 of the regulating valves 50 and 60 are shown as circular holes having different opening diameters. For convenience of explanation, FIG. 2 also shows the positions of the coil ends 20 and 22 to be cooled. However, in the initial state in which the single unit of the cooling pipe 30 with adjusting valve is manufactured, no refrigerant is flowing. This is the state. As shown in FIG. 2, when two regulating valves made in the same shape are arranged on the one end 42 side of the pipe 32, the large hole 56 is arranged on the one end 42 side. When the adjustment valve 50 is arranged on the other end 44 side of the pipe 32, the large hole 66 is arranged on the other end 44 side to become the adjustment valve 60.

  The operation of the cooling pipe 30 with the adjusting valve having the above configuration will be described with reference to FIGS. FIG. 3 shows a case where the refrigerant is supplied from the left side of FIG. 2, that is, from one end 42 side of the pipe 32, and FIG. 4 shows the right side of the page, that is, the other end 44 side of the pipe 32. The case where a refrigerant | coolant is supplied from is shown. The difference between FIG. 3 and FIG. 4 corresponds to the case where the arrangement of the cooling pipe 30 with the adjusting valve is left as it is in FIG. Alternatively, in FIG. 1, the arrangement of the refrigerant pump 24 is left as it is, and this corresponds to the case where the arrangement of the cooling pipe 30 with the adjusting valve is reversed left and right on the paper surface.

  As shown in FIG. 3, when the refrigerant is supplied from the one end 42 side of the pipe 32 and the other end 44 side is closed, the adjusting valve 50 and the adjusting valve 60 have the receiving plates 52 and 54 respectively. The refrigerant flows from the one end 42 side toward the other end 44 side. Accordingly, the regulating valves 50 and 60 are guided by the slide grooves 34 and 36 and moved in a direction from the one end 42 side of the pipe 32 toward the other end 44 side. As a result, the large hole 56 of the regulating valve 50 communicates with the discharge port 38 on the one end 42 side. A small hole 64 of the adjustment valve 60 communicates with the discharge port 40 on the other end 44 side.

  Since the other end 44 of the pipe 32 is closed, when the refrigerant is supplied from the one end 42 side, the flow of the refrigerant in the pipe 32 is caused by the pressure on the other end 44 side that becomes a dead end. It becomes higher than the pressure on the one end 42 side. Therefore, when the regulating valves 50 and 60 are not provided, the discharge opening areas of the discharge ports 38 and 40 are the same, so the flow rate from the discharge port 40 having a high pressure is high, and therefore the discharge flow rate from the discharge port 40 is high. However, it becomes larger than the discharge flow rate from the discharge port 38 having a low pressure, and a difference in discharge flow rate occurs between the discharge port 38 and the discharge port 40.

  When the regulating valves 50 and 60 are used, the regulating valves 50 and 60 are moved according to the flow of the refrigerant. As a result, the small hole 64 automatically communicates with the high-pressure discharge port 40, and the low-pressure discharge is performed. A large hole 56 communicates with the outlet 38. Therefore, the difference in the discharge flow rate between the discharge port 38 and the discharge port 40 is suppressed as compared with the case where the regulating valves 50 and 60 are not used. By appropriately setting the opening area of the large hole and the opening area of the small hole, the discharge flow rate of the discharge port 38 and the discharge flow rate of the discharge port 40 can be made the same. Thereby, the coil ends 20 and 22 can be cooled uniformly.

  As shown in FIG. 4, when the refrigerant is supplied from the other end 44 side of the pipe 32 and the one end 42 side is closed, the adjusting valve 50 and the adjusting valve 60 have the receiving plates 52 and 54 respectively. In the regulating valve 50 and the regulating valve 60, the respective receiving plates 52 and 54 receive the flow of the refrigerant from the other end 44 side toward the one end 42 side. As a result, the regulating valves 50 and 60 are guided by the slide grooves 34 and 36 and moved in the direction from the other end 44 side of the pipe 32 toward the one end 42 side. As a result, the large hole 66 of the regulating valve 60 communicates with the discharge port 40 on the other end 44 side. A small hole 54 of the adjustment valve 50 communicates with the discharge port 38 on the one end 42 side.

  Since the one end 42 of the pipe 32 is closed, when the refrigerant is supplied from the other end 44 side, the flow of the refrigerant in the pipe 32 causes the pressure on the one end 42 side that becomes a dead end, It becomes higher than the pressure on the other end 44 side. Accordingly, when the regulating valves 50 and 60 are not provided, the discharge opening areas of the discharge ports 38 and 40 are the same, so that the discharge flow rate from the discharge port 38 having a high pressure is reduced from the discharge port 40 having a low pressure. It becomes larger than the discharge flow rate, and a difference in discharge flow rate occurs between the discharge port 38 and the discharge port 40.

  When the regulating valves 50 and 60 are used, the regulating valves 50 and 60 are moved according to the flow of the refrigerant. As a result, the small hole 54 automatically communicates with the high-pressure discharge port 38, and the low-pressure discharge is performed. A large hole 66 communicates with the outlet 40. Therefore, the difference in the discharge flow rate between the discharge port 38 and the discharge port 40 is suppressed as compared with the case where the regulating valves 50 and 60 are not used. Thereby, the coil ends 20 and 22 can be cooled uniformly.

  In this way, by using the cooling pipe with a regulating valve having the configuration shown in FIG. 2, the discharge flow rate from the plurality of discharge ports can be made uniform regardless of the flow direction of the refrigerant.

  In the above, large holes and small holes are used in order to make the discharge flow rate from the plurality of discharge ports uniform when the pressure of the refrigerant flow at the position of the discharge port is different. Instead of this, the regulating valve is arranged along the flow of the refrigerant and has large and small throttle portions with different throttle amounts, and a throttle with a large throttle amount is arranged at the discharge port with a high refrigerant pressure so that the refrigerant pressure is low. It is good also as what arrange | positions the aperture_diaphragm | restriction with a small aperture amount to a discharge outlet. As the restriction, an orifice restriction that locally narrows the cross-sectional area of the flow path may be used. In addition, a porous filter may be used as the diaphragm, and the amount of restriction may be adjusted depending on the porosity.

  The cooling pipe with a regulating valve according to the present invention can be used in a cooling system for a rotating electrical machine.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine cooling system, 12 Motor case, 14 Rotating shaft, 16 Rotor, 18 Stator, 20, 22 Coil end, 24 Refrigerant pump, 26 Refrigerant supply pipe, 28 Termination plate, 30 Cooling pipe with adjustment valve, 32 Pipe, 34 , 36 Slide groove, 38, 40 Discharge port, 42 One end, 44 Other end, 50, 60 Adjustment valve, 52, 62 Back plate, 54, 64 Small hole, 56, 66 Large hole.

Claims (4)

A cooling pipe provided with a plurality of refrigerant discharge ports for discharging the refrigerant along the longitudinal direction;
A plurality of regulating valves provided in each of the plurality of discharge ports, and the difference between the discharge flow rate of the discharge port on the inlet side and the discharge flow rate of the discharge port on the back side according to the flow direction of the refrigerant A plurality of regulating valves in which the amount of adjustment to the refrigerant flow is changed in conjunction with each other,
A cooling pipe with a regulating valve. In the cooling pipe with a regulating valve according to claim 1,
Each of the plurality of regulating valves
A cooling pipe with a regulating valve, characterized in that it has a receiving plate for receiving the flow of the refrigerant, and moves according to the direction of the flow of the refrigerant, and the movement automatically changes the adjustment amount for the flow of the refrigerant. In the cooling pipe with a regulating valve according to claim 2,
Multiple regulating valves
It is arranged along the flow of the refrigerant and has large and small holes with different channel cross-sectional areas,
A cooling pipe with an adjusting valve, wherein a hole having a small channel cross-sectional area is disposed at a discharge port having a high refrigerant pressure, and a hole having a large channel cross-sectional area is disposed at a discharge port having a low refrigerant pressure. In the cooling pipe with a regulating valve according to claim 2,
Multiple regulating valves
Arranged along the flow of the refrigerant, having a large and small throttle part with different throttle amounts,
A cooling pipe with a regulating valve, wherein a throttle with a large throttle amount is disposed at a discharge port with a high refrigerant pressure, and a throttle with a small throttle amount is disposed at a discharge port with a low refrigerant pressure.

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