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

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

Background Art

[0002] Generally, there is known a solenoid valve that excites a fixed iron core disposed inside a winding by energizing the winding and switches a flow path by moving a movable iron core. As such a solenoid valve, there has been proposed one that holds a solenoid coil as a winding inside and includes a frame that forms 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 on 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 with respect to a frame having a C-shaped cross section.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0005] The objective of the present invention is to provide an electromagnetic coil unit that can improve heat dissipation performance. [Means for solving the problem]

[0006] The electromagnetic coil unit of the present invention is 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 spirally around a predetermined axis, and the outer casing has a pair of crossing 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 crossing plate portions together, and is formed in a rectangular cylindrical shape with its extending direction being perpendicular to both the opposing direction of the pair of crossing plate portions and the opposing direction of the pair of connecting plate portions, the axis is offset from the center of the crossing plate portions in the extending direction, and the dimensions of the coil portion in the opposing direction of the pair of connecting plate portions are 64 to 87% of the distance between the pair of connecting plate portions.

[0007] As described above, in the present invention, the axis of the winding is offset from the center of the cross plate portion, so that the winding has a portion that is close to the outer space and a portion that is far from it in the extending direction of the outer casing. Since the winding is more easily cooled closer to the outer space, a temperature difference can be created on both sides of the axis in the space inside the outer casing and around the coil portion. This temperature difference creates a pressure difference, which can generate an airflow from the high-pressure side (low-temperature side) to the low-pressure side (high-temperature side) (in other words, this temperature difference creates a density difference, which can generate an airflow from the high-density side (low-temperature side) to the low-density side (high-temperature side)). In the direction opposite to the pair of connecting plate portions, which is perpendicular to the direction in which the airflow is generated (extending direction), the dimensions of the coil portion are 64-87% of the distance between the pair of connecting plate portions, so that the above airflow can efficiently pass between the coil portion and the connecting plate portion, thereby improving heat dissipation performance.

[0008] Conversely, if the dimensions of the coil section are too large relative to the distance between the pair of connecting plates, the gap between the coil section and the connecting plates becomes smaller, making it difficult for airflow to pass through and thus difficult to obtain sufficient heat dissipation performance. Also, if the dimensions of the coil section are too small relative to the distance between the pair of connecting plates, the temperature and pressure differences described above are less likely to occur, making it difficult to generate airflow, and the magnetic path of the outer casing acting as a yoke becomes longer, reducing magnetic efficiency.

[0009] In this case, it is preferable that the electromagnetic coil unit of the present invention is positioned in the solenoid valve such that the extending direction of the outer casing is aligned with the vertical direction and the axis is positioned below the central portion. With this configuration, in addition to the airflow generated by the temperature difference, this airflow can be passed between the coil portion and the connecting plate portion as an upward airflow, thereby further improving the heat dissipation performance.

[0010] Furthermore, in the electromagnetic coil unit of the present invention, the amount of deviation of the axis from the central part is preferably 2 to 10% of the dimension of the intersecting plate portion in the extending direction. With such a configuration, it is easy to generate the above-mentioned airflow while suppressing an increase in size. Moreover, it is more preferable that this deviation amount is 3 to 8% of the dimension of the intersecting plate portion in the extending direction, and with such a configuration, it is easy to further suppress an increase in size while generating the above-mentioned airflow. On the other hand, if the deviation amount is too large relative to the above-mentioned dimension of the intersecting plate portion, the electromagnetic coil unit tends to become large. Also, if the deviation amount is too small relative to the above-mentioned dimension of the intersecting plate portion, it is difficult to generate a temperature difference and therefore difficult to generate an airflow. [Effects of the Invention]

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

[0012] [Figure 1] This is a schematic diagram of a refrigeration cycle equipped with a solenoid valve according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view showing the solenoid valve. [Figure 3] This is a plan view showing the solenoid valve. [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 this embodiment is used in a solenoid valve 102 as shown in Figure 1, and the solenoid valve 102 constitutes a refrigeration cycle 100 as shown in Figure 1, for example. The refrigeration cycle 100 is used in air conditioners such as room air conditioners, package air conditioners, and multi-split air conditioners, and comprises a compressor 103 for compressing the refrigerant as a fluid, an outdoor heat exchanger 104 as a first heat exchanger that functions as a condenser in cooling mode, an indoor heat exchanger 105 as a second heat exchanger that functions as an evaporator in cooling mode, an expansion valve 106 as an expansion means for expanding and reducing the pressure of 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 which is a pilot solenoid valve that switches and controls the flow path of the four-way switching valve 101, and these are connected by refrigerant piping. Note that the expansion means is not limited to the expansion valve 106, but may also be a capillary.

[0014] In the cooling mode (cooling operation) shown by the solid arrow in Figure 1, the refrigerant flows in the following order: compressor 103, four-way directional valve 101, outdoor heat exchanger 104, expansion valve 106, indoor heat exchanger 105, four-way directional valve 101, and compressor 103. On the other hand, in the heating mode (heating operation) shown by the dashed arrow, the refrigerant flows in the following order: compressor 103, four-way directional valve 101, indoor heat exchanger 105, expansion valve 106, outdoor heat exchanger 104, four-way directional valve 101, and compressor 103. Switching between this heating cycle and the cooling cycle is performed by the switching operation of the four-way directional valve 101 by the solenoid valve 102.

[0015] The four-way switching valve 101 is a well-known type and comprises a cylindrical valve body 111, a slide valve 112 slidably mounted 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 sealed cylinder by having plugs 117 and 118 that close both of its axial ends, and spaces A11 and A12 are formed that sandwich the piston 119 that moves the slide valve 112 from the axial direction.

[0016] The solenoid valve 102 in this embodiment is a well-known four-way switching valve, comprising a valve body 120, a valve seat 121, a valve element 122, an electromagnetic coil unit 1, and coupling members 123 to 126. The fluid flow path is switched when the valve element 122 moves along a predetermined sliding direction (i.e., direction of movement). Figure 1 is a schematic representation of how the various parts constituting the refrigeration cycle 100 are connected, and does not show the positional relationships, orientations, dimensions, etc. of each part. In particular, the detailed structure, arrangement, and orientation of the electromagnetic drive valve 102 will be described below.

[0017] As shown in Figures 2 and 3, the electromagnetic coil unit 1 comprises a plunger 2, an attractive element 3, a coil section 4, and an outer casing 5. When the winding 41 of the coil section 4 is energized, the attractive element 3 is energized, and as the plunger 2 moves toward the attractive element 3, the valve body 122 held by the plunger 2 moves. When the flow path is switched in the solenoid valve 102, the high-pressure fluid from the high-pressure side conduit 113 is introduced into one of the spaces A11 and A12 that sandwich the piston 119 from the axial direction, and the low-pressure fluid from the low-pressure side conduit 114 is introduced into the other space, causing the piston 119 to move toward the low-pressure 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 conductor 411 is wound around the bobbin 43 in a spiral shape 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.

[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 has an asymmetric shape 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 surface parts 471 that are continuous with the curved surface part 46 and extend toward one side in the X direction. The flat surface 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 that connect the pair of intersecting plate parts 51 and 52. 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 (that is, the axis A1) coincide with each other.

[0022] The through-hole 511 is 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 indicated by a dashed-dotted 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 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 in the X direction of the intersecting plate portion 51. 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 surface 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 in the Y direction of the intersecting plate portion 52 sandwiching the through-hole 521 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 bending, for example, 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 and 54 connect the Y-direction ends of the pair of intersecting plate portions 51 and 52 and extend along the ZX plane.

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

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

[0028] The following describes the relationship between the coil section 4 and the outer casing 5, and the manner of heat dissipation. First, a gap is formed between the outer surface of the coil section 4 (especially the curved section 46) and the connecting plate sections 53 and 54. At this time, the Y-direction dimension L1 of the coil section 4 is 64-87% of the distance L2 between the pair of connecting plate sections 53 and 54 (i.e., the distance between their inner surfaces). Note that the Y-direction dimension L1 of the coil section 4 refers to the maximum dimension in the Y-direction.

[0029] Furthermore, as described above, since axis A1 is shifted downward relative to line LN1, the coil section 4 is located near the lower opening of the cylindrical outer casing 5. As a result, when the coil section 4 generates heat due to current flow, the lower side in the X direction is more easily cooled by the outside air than the upper side. That is, in the space inside the outer casing 5 and around the coil section 4, the temperature is higher above axis A1 than below. In the high-temperature region, the pressure is relatively lower than in the low-temperature region, and this pressure difference creates an airflow from the low-temperature side to the high-temperature side (from bottom to top) (in other words, the above temperature difference creates a density difference, and an airflow is created from the high-density side (low-temperature side) to the low-density side (high-temperature side)).

[0030] At this time, a gap is formed between the outer surface of the coil portion 4 and the connecting plate portions 53 and 54, allowing the airflow described above to pass between the coil portion 4 and the connecting plate portions 53 and 54.

[0031] According to this embodiment, since the axis A1 of the winding 41 is offset from the center of the cross plate portion 51 in the X direction, a temperature difference can be created on both sides in the X direction with respect to axis A1 in the space inside the outer casing 5 and around the coil portion 4, and this temperature difference can generate airflow in the X direction. Since the Y-direction dimension of the coil portion 4 is 64-87% of the distance between the pair of connecting plate portions 53 and 54, the above airflow can efficiently pass between the coil portion 4 and the connecting plate portions 53 and 54, thereby improving heat dissipation performance.

[0032] Conversely, if the Y-direction dimension of the coil section 4 is too large relative to the distance between the pair of connecting plate sections 53 and 54, it becomes difficult to secure a gap between them, making it difficult for airflow to pass through and thus difficult to obtain sufficient heat dissipation performance. Also, if the Y-direction dimension of the coil section 4 is too small relative to the distance between the pair of connecting plate sections 53 and 54, the temperature difference described above is less likely to occur, making it difficult to generate airflow, and the magnetic path of the outer casing 5 acting as a yoke becomes longer, reducing magnetic efficiency.

[0033] Furthermore, since the rectangular cylindrical outer casing 5 extends in the vertical direction and the axis A1 of the winding 41 is positioned below the center of the cross plate section 51, the rising airflow can pass between the coil section 4 and the connecting plate sections 53 and 54, further improving the heat dissipation performance.

[0034] Furthermore, when the amount of displacement ΔX of the axis A1 of the winding 41 from the center 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, it is easy to generate the above-mentioned airflow while suppressing an increase in size. On the other hand, if the amount of displacement ΔX is too large relative to the dimension LX, the electromagnetic coil unit tends to become larger. Also, if the amount of displacement ΔX is too small relative to the dimension LX, it is difficult to generate a temperature difference and therefore difficult to generate airflow.

[0035] It should be noted that the present invention is not limited to the embodiments described above, and includes other configurations that can achieve the objectives of the present invention, and modifications such as those shown below are also included in the present invention. In the embodiments described above, the rectangular cylindrical outer box 5 extends along the vertical direction, but the direction of extension of the outer box may have a slight inclination with respect to the vertical direction. Also, if airflow is likely to be generated due to the temperature difference as described above, the direction of extension of the outer box may be along one direction in the horizontal plane.

[0036] Furthermore, in the above embodiment, the amount of deviation ΔX of the axis A1 of the winding 41 from the center of the cross plate portion 51 was assumed to be 2 to 10%, more preferably 3 to 8%, of the X-direction dimension LX of the cross plate portion 51, but the amount of deviation is not limited to this range. For example, if the outer casing is sufficiently large relative to the winding, the amount of deviation may be increased to make it easier for a temperature difference to occur. Also, if a temperature difference is likely to occur, the amount of deviation may be decreased.

[0037] Although embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and any design changes, etc., that do not depart from the spirit of the present invention are also included.

[0038] [Examples] In the electromagnetic coil unit 1 of the above embodiment, the ratio of 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, and the temperature was measured to confirm the relative temperature rise (temperature rise ratio).

[0039] The common experimental conditions were a voltage of 240V and 50Hz, and the temperature was measured when the current was continuously applied and the temperature reached saturation. Power consumption during operation was also measured. The dimensions of the outer casing 5 were kept constant, and only the Y-direction dimension L1 of the coil section 4 was changed, thereby altering the ratio of dimensions L1 to L2. Table 1 shows the results of the ratio of dimensions L1 to L2, the temperature rise ratio, and the power consumption.

[0040] [Table 1]

[0041] The temperature rise ratio was calculated by dividing the temperature rise value in each example and comparative example by the temperature rise value in Comparative Example 1. Similarly, the power consumption ratio was calculated by dividing the power consumption value in each example and comparative example by the power consumption value in Comparative Example 1. In Examples 1 to 4, where the ratio of L1 to L2 was 64-85%, the temperature rise ratio was low. It was confirmed that even when considering the power consumption ratio, the temperature rise ratio was low in Examples 1 to 4. [Explanation of Symbols]

[0042] 1... Electromagnetic coil unit, 4... Coil section, 41... Winding, 5... Outer casing, 51, 52... Cross plate section, 53, 54... Connecting plate section, 102... Solenoid valve, A1... Axle

Claims

1. An electromagnetic coil unit for switching a flow path in a solenoid valve, comprising a coil section and an outer casing disposed outside the coil section, The coil portion has a winding formed spirally around a predetermined axis, The outer casing has a pair of intersecting plate sections that sandwich the coil section from the direction of the axis, and a pair of connecting plate sections that connect the pair of intersecting plate sections together, and is formed in a rectangular cylindrical shape with its extending direction being perpendicular to both the opposing direction of the pair of intersecting plate sections and the opposing direction of the pair of connecting plate sections. The aforementioned axis is positioned offset from the center of the cross plate portion in the extending direction. An electromagnetic coil unit characterized in that, in the direction opposite to the pair of connecting plate portions, the dimensions of the coil portion are 64 to 87% of the distance between the pair of connecting plate portions.

2. The electromagnetic coil unit according to claim 1, characterized in that the extension direction of the outer casing is aligned with the vertical direction and the axis is positioned below the central portion when arranged in the solenoid valve.

3. The electromagnetic coil unit according to claim 1 or 2, characterized in that the amount of deviation of the axis from the central part is 2 to 10% of the dimension of the cross plate portion in the extending direction.

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