Electromagnetic Coil Unit

Abstract

To provide an electromagnetic coil unit capable of improving a radiation performance.SOLUTION: By arranging a shaft line A1 of a winding 41 so as to be deviated from a center part of a cross plate part 51 in a X direction, a temperature difference can be generated in both sides of the X direction while nipping the shaft line A1 in an inner part of an outer case 5 and a space of a circumference of a coil part 4, and an air flow of the X direction can be generated by the temperature difference. A Y direction dimension of the coil part 4 is 64 to 87% of an interval of both of a pair of coupling plate parts 53 and 54, and the air flow of them can pass effectively between the coil part 4 and the coupling plate parts 53 and 54, and can improve a radiation performance.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an electromagnetic coil unit used for a solenoid valve.

Background Art

[0002] Generally, a solenoid valve is known which energizes a fixed iron core disposed inside a winding by passing an electric current through the winding and switches a flow path by moving a movable iron core. As such a solenoid valve, one has been proposed which holds a solenoid coil as a winding inside and includes a frame forming a magnetic path (see, for example, Patent Document 1). In the solenoid valve described in Patent Document 1, the frame has an end plate portion that abuts one end portion in the central axis direction of a hollow bobbin, a pair of side plate portions coupled to the end plate portion, and extension portions that extend toward the central axis extending from each of the side plate portions, and is formed as a single component. Thereby, improvement of magnetic flux loss is aimed at for the frame having a C-shaped cross section.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the solenoid valve described in Patent Document 1, although a magnetic path can be formed by a rectangular cylindrical frame to surround the winding and reduce magnetic flux loss, there is a drawback that it is difficult to dissipate the heat generated when the winding is energized to the outside of the frame. For example, for cost reduction, when the cross-sectional area or the number of turns of the conductor constituting the winding is reduced to reduce the amount of conductor used, the resistance value increases, or the current required to secure the magnetomotive force increases. Since the resistive loss that causes heat generation increases depending on both the current and the resistance value, reducing the amount of conductor used as described above makes it easier to generate heat. Therefore, it has been desired to improve the heat dissipation performance in the electromagnetic coil unit used in the electromagnetic drive valve.

[0005] An object of the present invention is to provide an electromagnetic coil unit capable of improving heat dissipation performance.

Means for Solving the Problems

[0006] The electromagnetic coil unit of the present invention includes a coil portion and an outer casing disposed outside the coil portion, and is an electromagnetic coil unit for switching a flow path in a solenoid valve. The coil portion has a winding formed in a spiral shape around a predetermined axis. The outer casing has a pair of intersecting plate portions that sandwich the coil portion from the direction of the axis, and a pair of connecting plate portions that connect the pair of intersecting plate portions. The outer casing is formed in a rectangular cylindrical shape with the extending direction being a direction orthogonal to both the facing direction of the pair of intersecting plate portions and the facing direction of the pair of connecting plate portions. The axis is displaced from the central portion of the intersecting plate portion in the extending direction, and in the facing direction of the pair of connecting plate portions, the dimension of the coil portion is 64 to 87% of the interval between the pair of intersecting plate portions.

[0007] According to the present invention as described above, since the axis of the winding is displaced from the central portion of the intersecting plate portion, in the winding, in the extending direction of the outer casing, a portion close to the outer space and a portion far from the outer space are formed. Since the winding is more easily cooled when it is closer to the outer space, a temperature difference can be generated on both sides across the axis in the space inside the outer casing and around the coil portion. Due to this temperature difference, a pressure difference is generated, and an air flow can be generated from the high-pressure side (low-temperature side) to the low-pressure side (high-temperature side) (in other words, due to this temperature difference, a density difference is generated, and an air flow can be generated from the high-density side (low-temperature side) to the low-density side (high-temperature side)). In the facing direction of a pair of connecting plate portions, which is a direction orthogonal to the direction (extending direction) in which the air flow is generated as described above, when the dimension of the coil portion is 64 to 87% of the interval between the pair of intersecting plate portions, the above-mentioned air flow can efficiently pass between the coil portion and the connecting plate portion, and the heat dissipation performance can be improved.

[0008] On the other hand, if the above-mentioned dimension of the coil portion is too large with respect to the interval between the pair of connecting plate portions, the gap between the coil portion and the connecting plate portion becomes small, making it difficult for the air flow to pass through and difficult to obtain sufficient heat dissipation performance. Further, if the above-mentioned dimension of the coil portion is too small with respect to the interval between the pair of connecting plate portions, it is difficult for the above-mentioned temperature difference and pressure difference to occur, making it difficult to generate an air flow, and at the same time, the magnetic path of the outer casing as a yoke becomes long, resulting in a decrease in magnetic efficiency.

[0009] At this time, in the electromagnetic coil unit of the present invention, it is preferably arranged in the electromagnetic valve such that the extending direction of the outer casing is along the vertical direction and the axis is arranged on the lower side with respect to the central portion. According to such a configuration, in addition to the air flow generated by the temperature difference, this air flow can be passed as an upward air flow between the coil portion and the connecting plate portion, and the heat dissipation performance can be further improved.

[0010] In the electromagnetic coil unit of the present invention, the amount of deviation from the central portion of the axis is preferably 2 to 10% of the dimension of the intersecting plate portion in the extending direction. According to such a configuration, it is easy to generate the above-mentioned air flow while suppressing the increase in size. Further, the amount of deviation is more preferably 3 to 8% of the dimension of the intersecting plate portion in the extending direction. According to such a configuration, it is easier to further suppress the increase in size while generating the above-mentioned air flow. On the contrary, if the amount of deviation is too large with respect to the above-mentioned dimension of the intersecting plate portion, the electromagnetic coil unit is likely to increase in size. Also, if the amount of deviation is too small with respect to the above-mentioned dimension of the intersecting plate portion, it is difficult to generate a temperature difference and it is difficult to generate an air flow.

Advantages of the Invention

[0011] According to the electromagnetic coil unit of the present invention, the heat dissipation performance can be improved.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0013] Embodiments of the present invention will be described with reference to the drawings. The electromagnetic coil unit 1 of the present embodiment is used for the solenoid valve 102 as shown in FIG. 1, and the solenoid valve 102 constitutes, for example, a refrigeration cycle 100 as shown in FIG. 1. The refrigeration cycle 100 is used for air conditioners such as room air conditioners, package air conditioners, and multi-air conditioners, and includes a compressor 103 that compresses a refrigerant as a fluid, an outdoor heat exchanger 104 as a first heat exchanger that functions as a condenser in the cooling mode, a second heat exchanger that functions as an evaporator in the cooling mode, an indoor heat exchanger 105, an expansion valve 106 as an expansion means for expanding and depressurizing the refrigerant between the outdoor heat exchanger 104 and the indoor heat exchanger 105, a four-way switching valve 101, and a solenoid valve 102 that is a pilot solenoid valve for switching and controlling the flow path of the four-way switching valve 101, and these are connected by refrigerant pipes. Note that the expansion means is not limited to the expansion valve 106 and may be a capillary tube.

[0014] In the cooling mode (cooling operation) indicated by the solid line arrow in FIG. 1, this refrigeration cycle 100 constitutes a cooling cycle in which the refrigerant flows in the order of the compressor 103, the four-way switching valve 101, the outdoor heat exchanger 104, the expansion valve 106, the indoor heat exchanger 105, the four-way switching valve 101, and the compressor 103. On the other hand, in the heating mode (heating operation) indicated by the broken line arrow, it constitutes a heating cycle in which the refrigerant flows in the order of the compressor 103, the four-way switching valve 101, the indoor heat exchanger 105, the expansion valve 106, the outdoor heat exchanger 104, the four-way switching valve 101, and the compressor 103. The switching between this heating cycle and the cooling cycle is performed by the switching operation of the four-way switching valve 101 by the solenoid valve 102.

[0015] The four-way switching valve 101 is a well-known device and includes a cylindrical valve body 111, a slide valve 112 slidably provided inside the valve body, a high-pressure side conduit (D joint) 113 communicating with the discharge port of the compressor 103, a low-pressure side conduit (S joint) 114 communicating with the suction port of the compressor 103, an indoor side conduit (E joint) 115 communicating with the indoor heat exchanger 105, and an outdoor side conduit (C joint) 116 communicating with the outdoor heat exchanger 104. The valve body 111 is configured as a cylinder sealed as a whole by having plugs 117 and 118 closing both axial ends thereof, and spaces A11 and A12 sandwiching the piston 119 for moving the slide valve 112 from the axial direction are formed.

[0016] The solenoid valve 102 of the present embodiment is a well-known device having the configuration of a four-way switching valve and includes a valve body 120, a valve seat portion 121, a valve element 122, an electromagnetic coil unit 1, and joint members 123 to 126. The fluid flow path is switched by the valve element 122 moving along a predetermined slide direction (i.e., moving direction). Note that FIG. 1 schematically shows how each part constituting the refrigeration cycle 100 is connected, and does not show the positional relationship, orientation, dimensions, etc. of each part. In particular, the detailed structure, arrangement, and orientation of the electromagnetic drive valve 102 are as described below.

[0017] As also shown in FIGS. 2 and 3, the electromagnetic coil unit 1 includes a plunger 2, an armature 3, a coil portion 4, and an outer case 5. When the winding 41 of the coil portion 4 is energized, the armature 3 is excited, and the plunger 2 moves toward the armature 3, so that the valve element 122 held by the plunger 2 moves. By switching the flow path in the solenoid valve 102, the high-pressure fluid in the high-pressure side conduit 113 is introduced into one of the spaces A11 and A12 sandwiching the piston 119 from the axial direction, the low-pressure fluid in the low-pressure side conduit 114 is introduced into the other space, and the piston 119 moves toward the low-pressure side space.

[0018] The coil part 4 has a winding 41, a mold part 42, and a bobbin 43, and is integrally formed by molding. The winding 41 is a solenoid coil in which a conducting wire 411 is wound spirally around the bobbin 43 with respect to a predetermined axis A1. The mold part 42 is formed of a mold resin, which is an insulator, so that the winding 41 is provided inside thereof.

[0019] Hereinafter, the direction of the axis A1 is defined as the Z direction, and a plane orthogonal to the Z direction is defined as the XY plane. Also, it is assumed that the X direction coincides with the vertical direction.

[0020] The coil part 4 has end faces 44 and 45 on both sides in the Z direction, a curved surface part 46 which is a part of a cylinder centered on the axis A1, and a protruding part 47 which protrudes from the curved surface part 46 to one side in the X direction (the upper side in the vertical direction). The curved surface part 46 is formed concentrically with the winding 41, and the protruding part 47 is a part provided for connecting the lead wire 6 to the winding 41. Thus, the outer peripheral shape of the coil part 4 is asymmetric on both sides of a plane passing through the axis A1 and along the YZ plane. The protruding part 47 has a pair of flat parts 471 which are continuous with the curved surface part 46 and extend toward one side in the X direction. The flat part 471 is inclined with respect to the ZX plane.

[0021] The outer case 5 has a pair of intersecting plate parts 51 and 52, and a pair of connecting plate parts 53 and 54 for connecting the pair of intersecting plate parts 51 and 52 to each other. The intersecting plate part 51 extends along the XY plane and is provided so as to contact the end face 44 of the coil part 4 from the side opposite to the valve seat part 121. A through hole 511 for fixing the attractor 3 is formed in the intersecting plate part 51. The center of this through hole 511 coincides with the center of the columnar attractor 3, and the attractor 3 is arranged concentrically with the winding 41. Therefore, the center of the through hole 511 and the center of the winding 41 (i.e., the axis A1) coincide with each other.

[0022] The through-hole 511 is arranged to be displaced downward in the vertical direction from the central portion of the intersecting plate portion 51 in the X direction. In FIG. 3, a line LN1 passing through the central portion of the intersecting plate portion 51 in the X direction and extending along the Y direction is shown by a dashed line, and the through-hole 511 and the axis A1 are located below the line LN1. Therefore, in the solenoid valve 102, the axis A1 of the winding 41 is arranged to be displaced downward from the central portion of the intersecting plate portion 51 in the X direction. The displacement amount ΔX of the axis A1 from the line LN1 is 2 to 10% of the X-direction dimension LX of the intersecting plate portion 51, and more preferably 3 to 8%.

[0023] A notch portion 512 for arranging the lead wire 6 is formed at the upper edge of the intersecting plate portion 51 in the X direction. That is, the axis A1 is displaced to the side opposite to the side where the notch portion 512 is formed.

[0024] The intersecting plate portion 52 extends along the XY plane and is provided so as to contact the end face 45 of the coil portion 4 from the valve seat portion 121 side. A through-hole 521 through which the valve body 120 is inserted is formed in the intersecting plate portion 52. Incidentally, the portions on both sides of the through-hole 521 in the Y direction of the intersecting plate portion 52 may be connected to each other, or may be independent of each other (that is, as in the above-mentioned Patent Document 1, the outer case 5 is formed by, for example, bending a single metal plate, and a slit is formed at the joint of the edges of the metal plate). Further, the intersecting plate portion 51 and the intersecting plate portion 52 have the same dimensions in the X direction and the Y direction.

[0025] The connecting plate portions 53, 54 connect the Y-direction ends of the pair of intersecting plate portions 51, 52 and extend along the ZX plane.

[0026] As described above, the outer case 5 is formed in a rectangular tubular shape extending by the pair of intersecting plate portions 51, 52 and the pair of connecting plate portions 53, 54, and its extending direction coincides with the X direction.

[0027] The outer casing 5 as described above forms a magnetic circuit and functions as a yoke. That is, magnetic flux passes from one end of the winding 41 to the other end through the intersecting plate portion 51, through the pair of connecting plate portions 53, 54, through the intersecting plate portion 52, and then returns to the coil portion 4 again (or the magnetic flux passes in the opposite direction).

[0028] Hereinafter, the relationship between the coil portion 4 and the outer casing 5 and the mode of heat dissipation will be described. First, a gap is formed between the outer peripheral surface (particularly the curved surface portion 46) of the coil portion 4 and the connecting plate portions 53, 54. At this time, the dimension L1 of the coil portion 4 in the Y direction is 64 to 87% of the interval (that is, the interval between the inner surfaces) L2 between the pair of connecting plate portions 53, 54. Note that the dimension L1 of the coil portion 4 in the Y direction means the maximum dimension among the dimensions in the Y direction.

[0029] Also, since the axis A1 is shifted downward with respect to the line LN1 as described above, the coil portion 4 is located near the lower opening of the cylindrical outer casing 5. As a result, when the coil portion 4 generates heat due to energization, it is more easily cooled by the outside air on the lower side in the X direction than on the upper side. That is, in the space inside the outer casing 5 and around the coil portion 4, the temperature is higher above the axis A1 than below it. In the region where the temperature is high, the pressure is relatively lower than in the region where the temperature is low, and due to such a pressure difference, an air flow is generated from the side with a lower temperature to the side with a higher temperature (from the lower side to the upper side) (in other words, due to the above temperature difference, a density difference is generated, and an air flow is generated from the high-density side (low-temperature side) to the low-density side (high-temperature side)).

[0030] At this time, since a gap is formed between the outer peripheral surface of the coil portion 4 and the connecting plate portions 53, 54, the above-described air flow can pass between the coil portion 4 and the connecting plate portions 53, 54.

[0031] According to the above-described embodiment, since the axis A1 of the winding 41 is displaced from the central portion of the intersecting plate portion 51 in the X direction, a temperature difference can be generated on both sides in the X direction across the axis A1 in the space inside the outer casing 5 and around the coil portion 4, and an air flow in the X direction can be generated by this temperature difference. Since the dimension of the coil portion 4 in the Y direction is 64 to 87% of the distance between the pair of connecting plate portions 53 and 54, the above-described air flow can efficiently pass between the coil portion 4 and the connecting plate portions 53 and 54, and the heat radiation performance can be improved.

[0032] On the other hand, if the dimension of the coil portion 4 in the Y direction is too large with respect to the distance between the pair of connecting plate portions 53 and 54, it becomes difficult to secure a gap therebetween, the air flow hardly passes therethrough, and it becomes difficult to obtain sufficient heat radiation performance. Further, if the dimension of the coil portion 4 in the Y direction is too small with respect to the distance between the pair of connecting plate portions 53 and 54, the above-described temperature difference hardly occurs, it becomes difficult to generate an air flow, and the magnetic path of the outer casing 5 as a yoke becomes long, resulting in a decrease in magnetic efficiency.

[0033] Further, since the rectangular cylindrical outer casing 5 extends in the vertical direction and the axis A1 of the winding 41 is disposed below the central portion of the intersecting plate portion 51, the upward air flow can pass between the coil portion 4 and the connecting plate portions 53 and 54, and the heat radiation performance can be further improved.

[0034] Further, since the displacement amount ΔX of the axis A1 of the winding 41 from the central portion of the intersecting plate portion 51 is 2 to 10%, more preferably 3 to 8% of the dimension LX of the intersecting plate portion 51 in the X direction, it is easy to generate the above-described air flow while suppressing the increase in size. On the other hand, if the displacement amount ΔX is too large with respect to the dimension LX, the electromagnetic coil unit is likely to increase in size. Further, if the displacement amount ΔX is too small with respect to the dimension LX, a temperature difference hardly occurs and it is difficult to generate an air flow.

[0035] Note that the present invention is not limited to the above-described embodiments, and includes other configurations and the like that can achieve the object of the present invention. Modifications and the like as described below are also included in the present invention. In the above embodiment, the rectangular cylindrical outer casing 5 extends along the vertical direction, but the extending direction of the outer casing may have a slight inclination with respect to the vertical direction. Further, when an air flow is likely to be generated due to the temperature difference as described above, the extending direction of the outer casing may be along one direction in the horizontal plane.

[0036] Also, in the above embodiment, the amount of deviation ΔX of the axis A1 of the winding 41 from the central portion of the cross plate portion 51 is 2 to 10%, more preferably 3 to 8% of the X-direction dimension LX of the cross plate portion 51. However, the amount of deviation is not limited to such a range. For example, when the outer casing is sufficiently large with respect to the winding, the amount of deviation may be increased to make it easier to generate a temperature difference. Further, when a temperature difference is likely to occur, the amount of deviation may be decreased.

[0037] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention.

[0038] [Examples] In the electromagnetic coil unit 1 of the above-described embodiment, the ratio between the Y-direction dimension L1 of the coil portion 4 and the distance L2 between the pair of connecting plate portions 53 and 54 was changed, the temperature was measured, and the relative temperature rise (temperature rise ratio) was confirmed.

[0039] As common experimental conditions, the applied voltage was set to 240 V and 50 Hz, and the temperature was measured at the time when the temperature saturated after continuous energization. Also, the power consumption during energization was measured. By changing only the Y-direction dimension L1 of the coil portion 4 without changing the dimensions of the outer casing 5, the ratio between these dimensions L1 and L2 was changed. Table 1 shows the ratio between such dimensions L1 and L2, the measurement results of the temperature rise ratio, and the measurement results of the power consumption.

[0040]

Table 1

[0041] The value obtained by dividing the temperature rise value in each example and comparative example by the temperature rise value in Comparative Example 1 was defined as the temperature rise ratio. Similarly, the value obtained by dividing the power consumption value in each example and comparative example by the power consumption value in Comparative Example 1 was defined as the power consumption ratio. In Examples 1 to 4 where the ratio of L1 to L2 was 64 to 85%, the temperature rise ratio decreased. At this time, even considering the power consumption ratio, it was confirmed that the temperature rise ratio decreased in Examples 1 to 4.

Description of Reference Numerals

[0042] 1... electromagnetic coil unit, 4... coil part, 41... winding, 5... outer casing, 51, 52... cross plate parts, 53, 54... connecting plate parts, 102... solenoid valve, A1... axis

Claims

1. An electromagnetic coil unit for switching a flow path in a solenoid valve, comprising a coil portion and an outer casing disposed outside the coil portion, wherein the coil portion has a winding formed in a spiral around a predetermined axis, the outer casing has a pair of intersecting plate portions that sandwich the coil portion from the direction of the axis, and a pair of connecting plate portions that connect the pair of intersecting plate portions, and is formed in a rectangular cylindrical shape with a direction orthogonal to both the facing direction of the pair of intersecting plate portions and the facing direction of the pair of connecting plate portions as an extending direction, the axis is displaced from the central portion of the intersecting plate portion in the extending direction, an electromagnetic coil unit, wherein in the facing direction of the pair of connecting plate portions, the dimension of the coil portion is 64 to 87% of the interval between the pair of intersecting plate portions.

2. The electromagnetic coil unit according to claim 1, wherein the extending direction of the outer casing is along the vertical direction, and the axis is disposed below the central portion.

3. The electromagnetic coil unit according to claim 1 or 2, wherein the amount of displacement of the axis from the central portion is 2 to 10% of the dimension of the intersecting plate portion in the extending direction.

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