TWI601365B - Linear motor cooling unit - Google Patents

Description

Linear motor cooling unit

The present application claims priority based on Japanese Patent Application No. 2015-123700, filed on June 19, 2015. The content of the application will be used in this specification.

The present invention relates to a cooling unit for a linear motor.

As a cooling unit for cooling a coil of a linear motor, there is known a cooling unit including two flat plate-shaped cooling portions through which a refrigerant flows, and an inflow portion that flows into the refrigerant from the outside. The refrigerant is supplied to the cooling unit, and the outflow unit supplies the refrigerant from the cooling unit to the outside (for example, Patent Document 1). In the cooling unit, the coil is held by the two cooling portions, and the heating coil is cooled.

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2013-207838

In the cooling unit described in Patent Document 1, the inflow portion and the outflow portion and the two flat plate-shaped cooling portions are fastened together in a state in which the O-ring for suppressing the leakage of the refrigerant is interposed therebetween.

When the fastening is performed in a state in which the O-ring is interposed therebetween, the cooling portion is pushed by the repulsive force of the O-ring, and the cooling portion may be deformed. Therefore, it is conceivable to provide a rib member in the flow path, and to support the portion pushed by the O-ring from the inside of the flow path. However, if ribs are provided in the flow path, the flow path will be narrowed accordingly, and the pressure loss will increase. Therefore, it is not so simple to suppress the deformation of the cooling portion.

The present invention has been made in view of such circumstances, and an object thereof is to provide a cooling unit of a linear motor capable of suppressing an increase in pressure loss of a cooling portion and suppressing deformation of a cooling portion.

In order to solve the above problems, a cooling unit for a linear motor according to an embodiment of the present invention is a cooling unit for cooling a coil constituting a driving portion of a linear motor, and includes a flat plate cooling portion that is in close contact with a coil and is used to cool a coil. . The flat plate cooling unit includes a first flat plate member, a second flat plate member that is superposed on the first flat plate member, and a rib member. A concave portion is formed on a surface of the first flat plate member that is engaged with the second flat plate member, and a refrigerant for cooling the coil is formed in a gap between the concave portion and a surface of the second flat plate member that is superposed on the first flat plate member. The flow path, the rib member is fixed to one of the first plate member or the second plate member, and abuts against the first plate in the gap In the other of the member or the second plate member, a part of the flow path is divided into a plurality of branch flow paths by the rib members, and is formed on a surface portion of the second plate member forming at least one flow path of the plurality of branch flow paths. There are enlarged recesses.

Further, any combination of the above constituent elements or a technique for replacing the constituent elements and expressions of the present invention with each other among methods, apparatuses, systems, and the like is also effective as an embodiment of the present invention.

According to the present invention, it is possible to suppress an increase in pressure loss of the flat plate cooling portion and to suppress deformation of the flat plate cooling portion.

2‧‧‧ Flat Cooling Department

2a‧‧‧ gap

3‧‧‧Inflow Department

3c‧‧‧ lower

5‧‧‧ coil

6‧‧‧O-ring

7‧‧‧ gap

7b‧‧‧ gap

7c‧‧‧ gap

8‧‧‧flow path

8b‧‧‧Flow

8c‧‧‧flow path

11‧‧‧1st plate member

12‧‧‧2nd plate member

12a‧‧‧ openings

13‧‧‧3rd plate member

13a‧‧‧Expanding the recess

14‧‧‧4th plate member

20‧‧‧ rib members

20a‧‧‧ base

20b‧‧‧Protruding

100‧‧‧cooling unit

D‧‧‧Density of each enlarged recess 13a

W‧‧‧ Expanding the width of each recess 13a

Fig. 1 is a perspective view showing a cooling unit of a linear motor of an embodiment.

Fig. 2 is an exploded perspective view showing the flat plate cooling portion.

Figure 3 is a cross-sectional view showing the flat plate cooling portion.

Figure 4 is a cross-sectional view showing the rib member and its periphery.

Figure 5 is a cross-sectional view showing the rib member and its periphery.

Figure 6 is a graph showing the relationship between flow rate and pressure loss.

In the following, the same or equivalent constituent elements, component components, and steps are denoted by the same reference numerals, and the repeated description thereof will be omitted as appropriate. And, for the sake of understanding, the component components in the various drawings are The size is appropriately enlarged or reduced. Further, a part of the component assembly that is not important in the description of the embodiment is omitted in the drawings.

Fig. 1 is a perspective view showing a cooling unit 100 of a linear motor of an embodiment. The linear motor to which the cooling unit 100 of the present embodiment is applied includes a plurality of (three in the first drawing) coils 5 in a rectangular plate shape arranged in parallel in a predetermined direction, and are alternately arranged in parallel and opposed to the coil 5. A plurality of N-pole magnets and a plurality of S-pole magnets (both not shown) are provided. When the coil 5 is energized, an electromagnetic force is generated between the N-pole magnet and the S-pole magnet, and the coil 5 is moved by the cooling unit 100 by the electromagnetic force. Thereby, the coil 5 constitutes a drive unit of the linear motor. Further, in the embodiment, the coil 5 is formed of three phases of the A phase and the B phase.

The cooling unit 100 will cool the coil 5 and suppress its temperature rise. The cooling unit 100 includes two flat plate cooling units 2 that sandwich the coil 5 from both sides, an inflow portion 3 that is provided on one end side in the direction in which the coils 5 are arranged in parallel, and an outflow portion 4 that is provided on the other side.

The second and third figures show the flat plate cooling unit 2. Fig. 2 is a perspective view as seen from the side where the flat plate cooling portion 2 is in close contact with the coil 5. Fig. 3 is a cross-sectional view of the flat plate cooling unit 2. The flat plate cooling unit 2 includes a first plate member 11 , a second plate member 12 , a third plate member 13 , and a rib member 20 . The first plate member 11, the second plate member 12, the third plate member 13, and the rib member 20 are made of, for example, metal, ceramic, or resin. The first plate member 11, the second plate member 12, and the third plate member 13 are stacked in this order and are joined by diffusion or heat bonding. Join together.

The first plate member 11 is a flat plate having a rectangular shape. In the one end side of the longitudinal direction of the first plate member 11, six circular inflow ports 11a penetrating the flat surface are formed. The six inflow ports 11a are arranged side by side in the short side direction of the first plate member 11. Further, on the other end side in the longitudinal direction of the first plate member 11, six circular outflow ports 11b penetrating the flat surface are formed. The six outflow ports 11b are arranged side by side in the short-side direction of the first plate member 11.

The second flat plate member 12 is a rectangular flat plate having the same size as the first flat plate member 11 . On the second plate member 12, three rectangular openings 12a penetrating the flat surface are formed. The three openings 12a are arranged side by side in the short-side direction of the second plate member 12, and extend in the longitudinal direction of the second plate member 12. On one end side of each opening 12a, two circular openings 12b are formed, and on the other end side, two circular openings 12c are formed. That is, a total of six openings 12b and a total of six openings 12c are formed in the second plate member 12. The opening 12b and the opening 12c are provided at positions corresponding to the inflow port 11a and the outflow port 11b, respectively. Therefore, when the flat surface of the first plate member 11 and the flat surface of the second plate member 12 are overlapped, the inflow port 11a and the opening 12b communicate with each other, and the outflow port 11b and the opening 12c communicate with each other.

When the flat surface of the first plate member 11 and the flat surface of the second plate member 12 are overlapped, one of the three openings 12a of the second plate member 12 is blocked, and three recesses (hereinafter referred to as recesses 14a) are formed. One piece of the plate member (referred to as the fourth plate member 14). In addition, it can also The first plate member 11 and the second plate member 12 are not formed separately, but they are formed integrally. That is, the fourth plate member 14 having three recesses 14a can be formed in advance.

The third flat plate member 13 is a rectangular flat plate having the same size as the first flat plate member 11 and the second flat plate member 12 . An enlarged concave portion 13a (described later) is formed on the flat surface of the third flat plate member 13. The flat surface of the third plate member 13 and the surface of the fourth plate member 14 having one side of the recess 14a are overlapped and joined together, so that the openings of the three recesses 14a are blocked, and three gaps are formed in the flat plate cooling portion 2. 7a~7c (hereinafter, these are also collectively referred to as "gap 7"). The three gaps 7a to 7c function as three flow paths 8a to 8c (hereinafter, collectively referred to as "flow paths 8") extending in the longitudinal direction in the flat plate cooling portion 2. For example, a refrigerant such as cooling water can flow through the flow path 8. The flow paths 8a to 8c are connected to the upstream side of the inflow portion 3 in this order.

The rib members 20 are respectively provided at both ends of the opening 12a of the second plate member 12 in the longitudinal direction. Specifically, the rib member 20 is provided at an end portion of the opening 12a and a connecting portion 12d with the opening 12b, and an end portion of the opening 12a and a connecting portion 12e with the opening 12c. In the present embodiment, the rib member 20 and the second plate member 12 are integrally formed. Thereby, the rib member 20 is connected to the edge of the opening 12a of the second plate member 12. The structure of the rib member 20 will be described in detail based on FIGS. 4 and 5 .

Referring back to Fig. 1, the inflow portion 3 includes an upper portion 3b having a rectangular parallelepiped shape and two sides in the thickness direction (i.e., a direction orthogonal to the flat surface of the flat plate cooling portion 2). Shrink the way The lower portion 3c of the rectangular parallelepiped shape. The upper portion 3b is provided with an inflow port 3a which is open at the upper surface and extends downward. The lower portion 3c has substantially the same thickness as the coil 5 and is sandwiched by the two flat plate cooling portions 2. The inflow portion 3 is fixed to the flat plate cooling portion 2 by bolt fastening in a state where the lower portion 3c is sandwiched between the two flat plate cooling portions 2 and the lower surface of the upper portion 3b is in contact with the upper surface of the flat plate cooling portion 2. The inflow portion 3 is fixed to the flat plate cooling portion 2 in a state in which an O-ring 6 (not shown in the first drawing) for suppressing leakage of the refrigerant is interposed between the flat plate cooling unit 2 and the flat plate cooling unit 2, for example. Further, a plurality of through holes (not shown) are formed on the side surface of the lower portion 3c (that is, the surface in contact with the first flat plate member 11). When the inflow portion 3 is fixed to the flat plate cooling portion 2, each of the through holes communicates with each of the inflow ports 11a of the flat plate cooling portion 2. That is, the inflow portion 3 and the three flow paths 8a to 8c (that is, the three gaps 7a to 7c) of the flat plate cooling portion 2 are in communication with each other.

Similarly to the inflow portion 3, the outflow portion 4 includes an upper portion 4b having a rectangular parallelepiped shape and a lower portion 4c having a rectangular parallelepiped shape in which the upper portion 4b is contracted from both sides in the thickness direction. The upper portion 4b is provided with an outflow port 4a that is open at the upper surface and extends downward. Similarly to the inflow portion 3, the outflow portion 4 is held by the two flat plate cooling portions 2 in the lower portion 4c, and the lower surface of the upper portion 4b is in contact with the upper surface of the flat plate cooling portion 2, and is fastened by bolts. It is fixed to the flat plate cooling unit 2. The outflow portion 4 is fixed to the flat plate cooling portion 2 in a state in which the O-ring 6 is interposed between the flat plate cooling portion 2 and the plate. Further, a plurality of through holes (not shown) are formed on the side surface of the lower portion 4c. When the outflow portion 4 is fixed to the flat plate cooling portion 2, each of the through holes communicates with each of the outflow ports 11b of the flat plate cooling portion 2. That is, flat The three flow paths 8a to 8c (that is, the three gaps 7a to 7c) of the plate cooling unit 2 communicate with the outflow portion 4.

When the cooling water flows into the inflow port 3a of the inflow portion 3 in a state where the outflow portion 4 and the inflow portion 3 are fixed to the flat plate cooling portion 2, the refrigerant passes through the respective inflow ports 11a of the flat plate cooling portion 2 from the inflow portion 3. The three flow paths 8a to 8c in the flat plate cooling unit 2 flow through the respective flow outlets 11b, and then flow out from the flow outlets 4a of the outflow portion 4 to the outside.

4 and 5 are cross-sectional views showing the rib member 20 and its periphery. Fig. 4 is a view schematically showing one of the rib members 20 disposed in the rib member 20 disposed closest to the opening 12a of the upper portion 3b (i.e., disposed in the flow path 8a). Fig. 5 is a view schematically showing one of the rib members 20 provided in the rib member 20 which is disposed away from the two openings 12a of the upper portion 3b (i.e., disposed in the flow path 8b or in the flow path 8c). 4 and 5 may also be referred to as a cross-sectional view showing the periphery of the joint portion 12d or the joint portion 12e. The O-ring 6 is provided between the flat plate cooling unit 2 and the inflow portion 3. The rib member 20 includes a base portion 20a and two protrusion portions 20b. The base portion 20a is formed to be thinner than the second plate member 12 and is connected to the edge of the opening 12a. The two protrusions 20b protrude from the base portion 20a toward the side of the third plate member 13, and abut against the third plate member 13 in each of the gaps 7. Therefore, in the connecting portion 12d and the connecting portion 12e, each of the gaps 7, that is, the respective flow paths 8, is divided into three flow paths by the two protruding portions 20b. The refrigerant that has flowed into the flat plate cooling unit 2 from the inflow port 11a flows through the divided three flow paths (hereinafter referred to as "branch flow paths").

As shown in Fig. 5, in the flat surface of the third plate member 13, A portion of the branch flow path forming the flow path 8b or the flow path 8a is formed with an enlarged concave portion 13a. Each of the enlarged concave portions 13a has a rectangular cross-sectional shape. Each of the enlarged concave portions 13a may have a U shape, a V shape, or another cross sectional shape. In the present embodiment, each of the enlarged concave portions 13a is formed in the same size. That is, the width W, the depth D, and the length L (refer to FIG. 2) of each enlarged concave portion 13a are the same. On the other hand, as shown in Fig. 4, in the flat surface of the third plate member 13, the enlarged concave portion 13a is not formed in the portion of the branch flow path forming the flow path 8a.

In the cooling unit 100 according to the embodiment described above, in the connecting portions 12d and 12e, the protruding portion 20b of the rib member 20 abuts against the third flat member 13. Therefore, the flat plate cooling portion 2, the inflow portion 3, and the outflow portion 4 are fastened together in a state in which the O-ring is sandwiched therebetween, even if the first plate member 11 is pressed by the repulsive force of the O-ring, The first plate member 11 is also held by the rib member 20 from the opposite side. Thereby, deformation of the first plate member 11 can be suppressed. Further, in the flat surface of the third plate member 13, an enlarged concave portion 13a is formed in a portion where the branch flow path is formed. Here, in the connection portion 12d and the connection portion 12e, the amount of narrowing of the flow path corresponds to the amount of the rib member 20, but the amount of increase in the flow path corresponds to the amount of the enlarged concave portion 13a. Therefore, even if the rib member 20 is provided, it is possible to suppress the narrowing of the flow path and to suppress an increase in pressure loss. As a result, the cooling unit 100 of the present embodiment can suppress the deformation of the flat plate cooling unit 2 while suppressing an increase in the pressure loss of the flat plate cooling unit 2.

Further, the cooling unit 100 of the present embodiment is formed on the flat surface of the third plate member 13 at a portion of the branch flow path forming the flow path 8a. The enlarged concave portion 13a is not formed. In general, the flow path connected to the upstream side of the inflow portion 3 has a small pressure loss, and the flow path connected to the downstream side has a large pressure loss. Therefore, by providing the enlarged concave portion 13a in the flow path 8a connected to the upstream side of the inflow portion 3, the pressure loss between the flow path 8a connected to the upstream side and the flow paths 8b and 8c connected to the downstream side can be balanced. The refrigerant can flow more evenly through the respective flow paths.

The present inventors conducted simulations to confirm the effect of suppressing the increase in pressure loss by the cooling unit of the present embodiment. Figure 6 is a graph showing the relationship between flow rate and pressure loss. In Fig. 6, the horizontal axis represents the flow rate (L/min), and the vertical axis represents the pressure loss (kPa). The graph 50 shows the simulation result of the existing cooling unit in which the enlarged concave portion 13a is not provided, and the graph 52 shows the simulation result of the cooling unit 100 of the present embodiment in which the enlarged concave portion 13a is provided. As a result of the simulation, it is understood that the pressure loss of the cooling unit 100 according to the present embodiment is substantially reduced by half compared with the existing cooling unit.

The cooling unit of the present embodiment has been described above. The present embodiment is merely an example, and various modifications may be added to each of the constituent elements or combinations of the respective processing processes, and those modifications are also within the scope of the present invention, which can be understood by those skilled in the art. of. Modifications will be described below.

(Modification 1)

In the above embodiment, the enlarged concave portion is not formed in the portion of the flat surface of the third plate member 13 that forms the branch flow path of the flow path 8a. The case of the portion 13a has been described, but the present invention is not limited thereto. An enlarged concave portion 13a may be formed in a portion of the flat surface of the third flat member 13 that forms the branch flow path of the flow path 8a.

(Modification 2)

In the above-described embodiment, the flow path other than the flow path 8a has been described as the case where the enlarged concave portion 13a corresponding to all the branch flow paths is formed, but the present invention is not limited thereto. The enlarged concave portion 13a corresponding to at least one of the branch flow paths may be provided in the three branch flow paths of the respective flow paths. Further, for example, a common enlarged concave portion 13a that spans the two branch flow paths may be formed.

Further, in the above-described embodiment, the case where the sizes of the enlarged concave portions 13a are the same has been described. However, the present invention is not limited thereto, and the size of each of the enlarged concave portions 13a may be different. For example, the enlarged concave portion 13a formed on the flat surface of the third flat member 13 that is connected to the branch flow path on the downstream side of the inflow portion 3 can be formed to be large. In this case, at least one of the depth D, the width W, or the length L of the enlarged concave portion 13a can be made larger, so that the enlarged concave portion 13a is made larger. As a result, the branching flow path that is connected to the flow path on the downstream side of the inflow portion 3 becomes wider, and the pressure loss connected to the upstream side of the inflow portion 3 and the flow path connected to the downstream side can be reduced. Balancing is achieved, and the refrigerant can flow more evenly in each flow path.

(Modification 3)

Although not specifically described in the above embodiment, the pressure loss of the entire flat plate cooling unit 2 can be reduced as compared with the case where the enlarged concave portion 13a is not provided. Therefore, the third branch flow path can be formed. On at least a part of the flat surface of the flat plate member 13, a convex portion that protrudes toward the gap is formed instead.

(Modification 4)

In the above embodiment, the case where the rib member 20 and the second plate member 12 are integrally formed has been described, but the invention is not limited thereto. The rib member 20 may be formed integrally with the first plate member 11 or the third plate member 13. When the third flat member 13 is integrally formed, the protruding portion 20b of the rib member 20 may protrude toward the side of the first flat member 11. Alternatively, the rib member 20 may be joined to the first plate member 11, the second plate member 12, and the third plate member 13 separately from each other.

(Modification 5)

In the above embodiment, the case where the linear motor to which the cooling unit 100 is applied includes three coils, and the three coils are used to form the two phases of the A phase and the B phase, but the present invention is not limited thereto. this. The linear motor may include one, two or more coils, that is, the linear motor may include: at least one coil, or the at least one coil may be used to form the two phases A and B. And the linear motor may also be a coil including: an integer multiple of three, which may be an integer multiple of three The number of coils forms three phases of U phase, V phase, and W phase.

Any combination of the above embodiments and modifications can also function as an embodiment of the present invention. The new embodiment produced by the combination has various effects of the combined embodiments and modifications.

2‧‧‧ Flat Cooling Department

3‧‧‧Inflow Department

3c‧‧‧ lower

6‧‧‧O-ring

7b‧‧‧ gap

7c‧‧‧ gap

8b‧‧‧Flow

8c‧‧‧flow path

11‧‧‧1st plate member

12‧‧‧2nd plate member

12a‧‧‧ openings

13‧‧‧3rd plate member

13a‧‧‧Expanding the recess

14‧‧‧4th plate member

20‧‧‧ rib members

20a‧‧‧ base

20b‧‧‧Protruding

D‧‧‧Density of each enlarged recess 13a

W‧‧‧ Expanding the width of each recess 13a

Claims (4)

A cooling unit for a linear motor for cooling a coil constituting a driving portion of a linear motor, wherein the cooling unit of the linear motor is characterized in that: a flat plate cooling portion that is in close contact with the coil and used to cool the coil; The cooling unit includes a first plate member, a second plate member that overlaps the first plate member, and a rib member, and a concave portion is formed on a surface of the first plate member that is engaged with the second plate member. a gap between the recessed portion and the second flat plate member that overlaps the first flat plate member is formed with a flow path for cooling the refrigerant of the coil, and the rib member is fixed to the first flat plate member or the second flat plate One of the members abuts against the other of the first plate member or the second plate member in the gap, and a part of the flow path is divided into a plurality of branch channels by the rib member, and is formed. An enlarged concave portion is formed in a surface portion of the second flat member of at least one of the plurality of branch passages. The cooling unit of the linear motor according to claim 1, wherein the enlarged concave portion is formed in each of the portions of the surface of the second plate member on which the plurality of branch flow paths are formed. Cooling of a linear motor as described in claim 1 or 2 In the unit, the plurality of flow paths are formed in the flat plate cooling unit, and the plurality of flow paths are connected to the inflow portion that supplies the cooling water, and the branch flow path that is connected to the flow path on the most upstream side of the inflow portion is formed. The enlarged concave portion is not formed in a portion of the surface of the second flat member. The cooling unit of the linear motor according to claim 1 or 2, wherein a plurality of flow paths are formed in the flat plate cooling unit, and the plurality of flow paths are respectively connected to an inflow portion to which cooling water is supplied, so that The branching flow path which is located on the downstream side of the inflow portion and which is connected to the flow path is formed to have a wider expanded portion.