Cooling device

Abstract

To make it possible to improve maintainability.SOLUTION: A cooling device comprises: a refrigerant circuit (10) connecting a compressor (12), a condenser (13), an expansion mechanism (14), and an evaporator (15); a housing part (11) housing the compressor (12), the condenser (13), and the expansion mechanism (14); and a capturing part (22 or 112) for capturing sludge in liquid (E). The evaporator (15) includes a coil part (15a) arranged below the housing part (11). The capturing part (22 or 112) is arranged below the housing part (11).SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a cooling device. [Background technology]

[0002] The submerged liquid cooling device described in Patent Document 1 includes a refrigerant circuit to which a compressor, a condenser, an expansion valve, and an evaporator are connected, and the evaporator is submerged in the liquid to cool the liquid. The evaporator includes a coil portion. The coil portion has an inner refrigerant pipe wound in a spiral shape along the vertical direction, and an outer refrigerant pipe surrounding the inner refrigerant pipe and wound in a spiral shape along the vertical direction. The inner refrigerant pipe and the outer refrigerant pipe are coated with a fluororesin paint to prevent sludge such as grinding chips contained in the machining fluid from adhering thereto. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-068606 A Summary of the Invention [Problem to be solved by the invention]

[0004] Even if the coil is coated with fluororesin, it is not possible to completely prevent sludge from adhering to the coil. A small amount of sludge still adheres to the coil, requiring maintenance of the coil.

[0005] However, since it is difficult to reach the inside of the coil during maintenance work, it is difficult to remove the sludge that has adhered to the inside of the coil. Also, since the fluororesin paint is weak against friction, there is a possibility that the fluororesin paint will come off when wiping the surface of the coil to remove the sludge during maintenance work.

[0006] An object of the present disclosure is to provide a cooling device that can improve maintainability. [Means for solving the problem]

[0007] The cooling device of the first embodiment includes a refrigerant circuit (10) connecting a compressor (12), a condenser (13), an expansion mechanism (14), and an evaporator (15), an accommodation section (11) that accommodates the compressor (12), the condenser (13), and the expansion mechanism (14), a coil section (15a) included in the evaporator (15) and disposed below the accommodation section (11) and immersed in a liquid (E) to cool the liquid (E), and a trapping section (22, 112) that traps sludge in the liquid (E), and the trapping section (22, 112) is disposed below the accommodation section (11).

[0008] In the first aspect, the sludge is trapped by the trapping portion (22, 112), and thus adhesion of the sludge to the coil portion (15a) can be prevented, thereby improving maintainability.

[0009] In a second aspect, in the first aspect, the trapping portion (22) includes a magnet (22b) and traps the sludge by the magnetic force of the magnet (22b).

[0010] In the second embodiment, the trapping portion (22) can be reused by wiping off the sludge adhering to the surface of the trapping portion (22) using the magnetic force of the magnet (22b).

[0011] In a third aspect, in the first or second aspect, the capture portion (22, 112) is disposed inside the coil portion (15a).

[0012] In the third aspect, adhesion of sludge to the coil portion (15a) can be effectively prevented.

[0013] In a fourth aspect, in the third aspect, the cooling device is provided with an agitator (17) that is arranged inside the coil portion (15a) and agitates the liquid (E) to generate an agitated flow in the liquid (E), and the capture portion (22) is arranged within the area where the agitated flow is generated.

[0014] In the fourth embodiment, the sludge can be effectively captured by the capture section (22) by utilizing the agitation flow.

[0015] A fifth aspect is any one of the first to fourth aspects, wherein the capture portion (22) has a rod-like shape extending in the up-down direction.

[0016] In the fifth embodiment, sludge present in an area having width in the vertical direction in the liquid (E) can be captured by the capture portion (22).

[0017] In a sixth aspect, in the fifth aspect, the capture portion (22) has a circular outer shape in a cross section perpendicular to the up-down direction.

[0018] In the sixth embodiment, the sludge can be effectively attached to the outer surface of the trapping portion (22).

[0019] In a seventh aspect, in any one of the first to sixth aspects, the capture portion (22) is detachably attached to the storage portion (11) or to a leg portion (18) provided on the lower surface (11a) of the storage portion (11).

[0020] In the seventh embodiment, the capture portion (22) can be removed from the housing portion (11) or the leg portion (18) to allow maintenance of the capture portion (22) independent of the housing portion (11) or the leg portion (18).

[0021] In an eighth aspect, in the seventh aspect, the storage portion (11) or the leg portion (18) is provided with a plurality of points to which the capture portion (22) can be attached.

[0022] In the eighth embodiment, the attachment location of the capture portion (22) can be selected.

[0023] A ninth aspect is any one of the first to eighth aspects, wherein a lower end of the capture portion (22) is located lower than a lower end of the coil portion (15a).

[0024] In the ninth aspect, adhesion of sludge to the coil portion (15a) can be effectively prevented.

[0025] A tenth aspect is any one of the first to ninth aspects, wherein the capture portion (22) is arranged inside the coil portion (15a) and is detachably attached to the lower surface (11a) of the accommodating portion (11), and a gap (C) is provided between the coil portion (15a) and the lower surface (11a) of the accommodating portion (11).

[0026] In the tenth aspect, maintenance of the capture portion (22) can be easily performed.

[0027] In an eleventh aspect, in the first aspect, the cooling device includes a cylindrical portion (110) made of a non-magnetic material, a magnet (120) provided within the cylindrical portion (110) and configured to cause the sludge to adhere to the outer surface of the cylindrical portion (110) by magnetic force, a moving portion (130) for moving the magnet (120) within the cylindrical portion (110), the magnet (120) moved by the moving portion (130), and a separating portion (140) for separating the magnet (120) from the sludge adhered to the outer surface of the cylindrical portion (110), wherein the moving portion (130) includes a string-like member connected to the magnet (120) and extending to the outside of the cylindrical portion (110) through an opening (111) at one end (110a) of the cylindrical portion (110), and the cylindrical portion (110) includes the capture portion (112) that is immersed in the liquid (E).

[0028] In the eleventh aspect, by moving the magnet (120) using the moving part (130), the sludge in the liquid (E) adhering to the outer surface of the tubular part (110) is moved to the outside of the liquid (E) by the magnetic force of the magnet (120), and further by separating the magnet (120) from the sludge using the separating part (140), the magnetic force of the magnet (120) acting on the sludge is suppressed, so that the sludge can be separated from the outer surface of the tubular part (110) and collected. [Brief description of the drawings]

[0029] [Figure 1]FIG. 1 is a perspective view showing the configuration of a cooling device. [Diagram 2] FIG. 2 is a schematic diagram showing the configuration of the refrigerant circuit. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of the coil portion. [Figure 4] FIG. 4 is a bottom view of the cooling device. [Diagram 5] FIG. 5 is a diagram showing an area where the capture portion is preferably located. [Figure 6] FIG. 6 is a diagram showing the position of the capture portion relative to the flow of liquid in the tank. [Figure 7] 7(a) to 7(c) are plan views showing an agitated flow generated in a liquid by an agitator. [Figure 8] FIG. 8 is a diagram showing a procedure for cleaning the capture part. [Figure 9] FIG. 9 is a cross-sectional view of the sludge recovery device. [Figure 10] Fig. 10(a) is a cross-sectional view of the lower surface of the storage unit as viewed from below, and Fig. 10(b) is a cross-sectional view of the side surface of the storage unit as viewed from the horizontal direction. [Figure 11] Fig. 11(a) is a cross-sectional view of the cut-off portion as viewed from the horizontal direction, and Fig. 11(b) is a cross-sectional view of the flange portion as viewed from the lower horizontal direction. [Figure 12] FIG. 12 is a cross-sectional view of the sludge recovery device. [Figure 13] FIG. 13 is a cross-sectional view of the sludge recovery device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical idea of ​​the present disclosure. Since each drawing is intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding. In each embodiment, modified example, and drawing, the same or equivalent parts are given the same reference symbols, and detailed descriptions and descriptions of the accompanying effects will not be repeated.

[0031] -Cooling unit- As shown in Fig. 1, the cooling device unit (U) is provided with a machine tool (M) and a tank (T), and is applied to a system in which a liquid (E) circulates between the machine tool (M) and the tank (T). The cooling device unit (U) cools the liquid (E) in the tank (T). The machine tool (M) in this embodiment is a machine that performs cutting processing, such as a grinding machine or a machining center. The liquid (E) is, for example, a working fluid such as a grinding fluid or a spindle lubricant for the machine tool.

[0032] A liquid (E) is stored in the tank (T). During operation of the machine tool (M), the amount of liquid (E) stored in the tank (T) is maintained approximately constant. The tank (T) is provided with an inlet (P1) and an outlet (P2). A pipe (5) leading to the machine tool (M) is connected to the inlet (P1) and the outlet (P2). A pump (not shown) is connected to the pipe (5). The pump adjusts the flow direction and flow rate of the liquid (E) flowing through the pipe (5). When the pump is operated, the liquid (E) flowing out of the machine tool (M) flows into the tank (T) through the inlet (P1). The liquid (E) in the tank (T) flows out towards the machine tool (M) through the outlet (P2).

[0033] The cooling device unit (U) includes a cooling device (1). The cooling device (1) is installed in a tank (T). The cooling device (1) is placed on a plate-shaped member (T2) (see FIG. 3) that constitutes the upper surface of the tank (T). The liquid (E) flowing out of the tank (T) is heated by the machine tool (M). The heated liquid (E) flows into the tank (T) and is cooled by the cooling device (1). As a result, the rise in the temperature of the liquid (E) in the tank (T) is suppressed. In the following, the up-down direction indicates the vertical direction when the cooling device (1) is installed in the tank (T) and is in a position to perform an operation of cooling the liquid (E) in the tank (T).

[0034] - Cooling system configuration - As shown in Fig. 1 and Fig. 2, the cooling device (1) includes a storage section (11), a compressor (12), a condenser (13), an expansion mechanism (14), an evaporator (15), a blower fan (16), an agitator (17), and an operation panel (21). The compressor (12), the condenser (13), the expansion mechanism (14), and the evaporator (15) are connected in this order to a refrigerant circuit (10). The refrigerant circuit (10) is filled with refrigerant. The refrigerant circuit (10) performs a vapor compression refrigeration cycle. The compressor (12), the condenser (13), and the expansion mechanism (14) are housed in the storage section (11).

[0035] -Containment Unit- As shown in Figs. 1 and 3, the storage unit (11) is formed in a box shape extending in the vertical direction. The storage unit (11) is disposed above the liquid (E) in the tank (T). Legs (18) are attached to the lower surface (11a) of the storage unit (11). The legs (18) are provided on the lower surface (11a) of the storage unit (11) and protrude downward from the lower surface (11a) of the storage unit (11). The lower ends of the legs (18) are immersed in the liquid (E) in the tank (T). The lower ends of the legs (18) may be floating above the bottom surface (T1) of the tank (T) or may be placed on the bottom surface (T1) of the tank (T). Four legs (18) are provided on the lower surface (11a) of the storage unit (11). The lower surface (11a) of the storage section (11) is placed on the plate-like member (T2) that constitutes the upper surface of the tank (T). The storage section (11) of the cooling device (1) is fixed to the plate-like member (T2) by, for example, bolts. Holes are formed in the plate-like member (T2), and the legs (18), coil section (15a), stirring section (17b), and capture section (22) are immersed in the liquid (E) in the tank (T) through the holes (see FIG. 3).

[0036] -Compressor- As shown in Fig. 2, the compressor (12) sucks in and compresses a low-pressure gas refrigerant. The compressor (12) discharges the compressed refrigerant. The compressor (12) is of a variable displacement type in which power is supplied to the electric motor from an inverter circuit. In other words, the compressor (12) is configured so that the operating frequency (number of rotations) of the electric motor can be adjusted. The compressor (12) does not necessarily have to include an inverter circuit.

[0037] -Condenser- The condenser (13) exchanges heat between the refrigerant and air delivered by the blower fan (16). Specifically, in the condenser (13), the refrigerant dissipates heat into the air and is condensed. The blower fan (16) is disposed near the condenser (13) and delivers the air passing through the condenser (13). The condenser (13) may be a water-cooled condenser that exchanges heat between water and the refrigerant.

[0038] -Expansion mechanism- The expansion mechanism (14) reduces the pressure of the refrigerant. The expansion mechanism (14) includes, for example, an electric expansion valve whose opening is adjustable. The expansion mechanism (14) may include a temperature-sensitive expansion valve, a capillary tube, or the like.

[0039] -Evaporator- The evaporator (15) exchanges heat between the liquid (E) in the tank (T) and the refrigerant. Specifically, in the evaporator (15), the refrigerant absorbs heat from the liquid (E) and evaporates. The evaporator (15) includes a coil portion (15a) formed in a coil shape along the vertical direction. The coil portion (15a) is disposed below the storage portion (11) and is disposed so as to be immersed in the liquid (E) in the tank (T). Leg portions (18) are disposed on the outer sides of the coil portion (15a).

[0040] A refrigerant flows through the coil portion (15a). Heat exchange between the liquid (E) and the refrigerant occurs through the coil portion (15a), and the liquid (E) is cooled.

[0041] A gap (C) is provided between the coil portion (15a) and the lower surface (11a) of the storage portion (11). For example, the cooling device (1) is installed in the tank (T) so that the liquid level (E1) of the liquid (E) is located in the gap (C).

[0042] The coil portion (15a) includes an inner refrigerant pipe (15a1) that is wound in a spiral shape along the vertical direction, and an outer refrigerant pipe (15a2) that is disposed outside the inner refrigerant pipe (15a1) and wound in a spiral shape along the vertical direction. As a result, the surface area of ​​the refrigerant pipes (15a1, 15a2) is increased to improve the heat exchange efficiency while preventing the coil portion (15a) from increasing in vertical length. The refrigerant pipes (15a1, 15a2) are formed by branching one refrigerant pipe into two pipes upstream of the compressor (12) and downstream of the expansion mechanism (14) (see FIG. 2), and the refrigerant in the refrigerant pipes (15a1, 15a2) flows from the expansion mechanism (14) toward the compressor (12). In addition, in this embodiment, the coil portion (15a) has the refrigerant piping (15a1, 15a2) wound in a spiral shape twice, but the refrigerant piping may be wound in a spiral shape once, and there is no particular limitation on the number of times the refrigerant piping is wound.

[0043] 3, 6, and 8, the refrigerant pipes (15a1, 15a2) of the coil portion (15a) are shown in cross-sectional views of a portion (the front portion of the drawings) cut in the vertical direction. In reality, the refrigerant pipes (15a1, 15a2) of the coil portion (15a) extend in a spiral shape, as shown in FIG.

[0044] -Mixer- The agitator (17) is disposed so as to be immersed in the liquid (E) in the tank (T). The agitator (17) generates a flow (agitated flow) in the liquid (E) in the tank (T) by agitating the liquid (E) in the tank (T). The agitator (17) is disposed inside the coil portion (15a). By disposing the agitator (17) in the vicinity of the coil portion (15a), heat exchange between the refrigerant and the liquid (E) is promoted. The agitator (17) has a shaft portion (17a) extending downward from the lower surface (11a) of the storage portion (11) and an agitating portion (17b) fixed to the shaft portion (17a). The agitating portion (17b) is a blade-shaped member. The agitator (17) (shaft portion (17a) and agitating portion (17b)) rotates by the power of an agitation motor provided in the storage portion (11). The agitator (17) is rotated to agitate the liquid (E) in the tank (T).

[0045] -Operation panel- As shown in Fig. 1, the cooling device unit (U) has an operation panel (21). The operation panel (21) receives predetermined operation instructions through operation by a user. The operation panel (21) has a display (not shown) that displays the liquid temperature, and the like. The operation panel (21) is disposed, for example, in front of the storage section (11).

[0046] - Driving operation - As shown in FIGS. 1 to 3, the refrigerant compressed by the compressor (12) flows through the condenser (13). In the condenser (13), the refrigerant dissipates heat to the air and is condensed. If the condenser (13) is a water-cooled condenser, the refrigerant dissipates heat to water and is condensed. The refrigerant that has dissipated heat in the condenser (13) is reduced in pressure by the expansion mechanism (14) and then flows through the evaporator (15). In the evaporator (15) (coil portion (15a)), the refrigerant absorbs heat from the liquid (E) and evaporates. The liquid (E) cooled by the evaporator (15) is agitated by the agitator (17), thereby suppressing an increase in the liquid temperature in the tank (T). The refrigerant that has evaporated in the evaporator (15) is sucked into the compressor (12) and compressed again.

[0047] -Capture section- As shown in Fig. 3, the cooling device (1) includes a trapping portion (22). The trapping portion (22) traps sludge in the liquid (E). The sludge is, for example, metal powder, grinding chips (cuttings), or abrasives. In this embodiment, the sludge is a magnetic substance.

[0048] The capture portion (22) includes a tube portion (22a) and a magnet (22b). The tube portion (22a) is a hollow member. The tube portion (22a) is made of, for example, a corrosion-resistant material such as stainless steel (e.g., SUS304). The tube portion (22a) has a rod-like shape extending in the vertical direction. The tube portion (22a) has a circular outer shape in a cross section perpendicular to the vertical direction. The magnet (22b) is a permanent magnet. The magnet (22b) is a rod-like member extending in the vertical direction and is disposed inside the tube portion (22a). The magnet (22b) is disposed inside the corrosion-resistant tube portion (22a), thereby preventing rust from forming on the surface of the magnet (22b). Sludge in the liquid (E) adheres to the outer surface of the tube portion (22a) by the magnetic force of the magnet (22b).

[0049] By making the outer shape of the cross section of the pipe section (22a) perpendicular to the up-down direction circular, it is possible to suppress variation in the distance from the center of the magnet (22b) to the outer surface of the pipe section (22a) and to effectively prevent the magnetic force of the magnet (22b) from being biased with respect to the outer surface of the pipe section (22a). As a result, the sludge can be effectively attached to the outer surface of the capture section (22). Furthermore, by making the outer shape of the cross section of the pipe section (22a) perpendicular to the up-down direction circular, it is possible to easily wipe off the sludge attached to the outer surface of the pipe section (22a).

[0050] The capture portion (22) is separate from the coil portion (15a) and is disposed below the storage portion (11). The capture portion (22) is located at a position spaced apart from the coil portion (15a). The capture portion (22) protrudes downward from the storage portion (11). The capture portion (22) is disposed within a region where an agitated flow is generated by the agitator (17). The agitated flow refers to a flow of the liquid (E) generated by the rotation of the agitator (17).

[0051] The capture portion (22) is detachably attached to the lower surface (11a) of the storage portion (11). A thread (22a1) is formed at the upper end of the tube portion (22a). The thread (22a1) of the tube portion (22a) is formed, for example, by tapping. A thread (11a1) is formed at the lower surface (11a) of the storage portion (11). The thread (11a1) of the storage portion (11) is, for example, a thread formed on a bolt embedded in the lower surface (11a) of the storage portion (11). The thread (22a1) of the tube portion (22a) is fastened to the thread (11a1) of the storage portion (11), thereby attaching the capture portion (22) to the storage portion (11).

[0052] The capture portion (22) is disposed inside the coil portion (15a). The lower end of the capture portion (22) (magnet (22b)) is located below the lower end of the coil portion (15a) and above the bottom surface (T1) of the tank (T).

[0053] The magnetic flux density on the outer surface of the trapping portion (22) is preferably 0.8 T or more from the viewpoint of effectively attaching sludge such as fine iron powder to the outer surface of the trapping portion (22). If the magnetic flux density on the outer surface of the trapping portion (22) is too high during maintenance of the trapping portion (22), it becomes difficult to peel off and remove the sludge attached to the outer surface of the trapping portion (22) from the outer surface of the trapping portion (22). Therefore, the magnetic flux density on the outer surface of the trapping portion (22) is preferably 1.2 T or less from the viewpoint of easily removing the sludge attached to the outer surface of the trapping portion (22) from the outer surface of the trapping portion (22) during maintenance of the trapping portion (22). To effectively ensure a magnetic flux density of 0.8 T or more and 1.2 T or less on the outer surface of the trapping portion (22), the diameter of the trapping portion (22) (the diameter of the tube portion (22a)) is preferably 15 mm or more and 35 mm or less.

[0054] -heater- FIG. 4 is a view of the cooling device (1) as viewed from below. As shown in FIG. 4, the cooling device (1) may include a heater (23). The heater (23) is attached to the lower surface (11a) of the storage section (11) and protrudes downward so as to be immersed in the liquid (E) in the tank (T). The heater (23) is disposed inside the coil section (15a). The heater (23) is used to raise the temperature of the liquid (E) to a predetermined temperature when the liquid (E) in the tank (T) becomes too cold, for example, in the middle of winter.

[0055] -First example of the capture position- The horizontal distance from the center of the capture portion (22) to the protrusion (D) is greater than R1 mm. R1 is the radius of the capture portion (22) and is, for example, 7.5 mm or more and 17.5 mm or less (7.5 mm≦R1≦17.5 mm). The protrusion (D) is a member such as a screw fastened to the lower surface (11a) of the storage portion (11) and a part protruding from the lower surface (11a) of the storage portion (11), such as a convex part formed by burring or the like. When multiple protrusions (D) are present on the lower surface (11a) of the storage portion (11), the horizontal distance from the center of the capture portion (22) to each of the multiple protrusions (D) is greater than R1 mm. With this configuration, the capture portion (22) can be installed without being interfered with by the protrusions (D).

[0056] -Second example of catch position- In the following, components other than the capture portion (22) installed below the storage portion (11), such as the coil portion (15a), the agitator (17), and the heater (23), may be collectively referred to as peripheral components.

[0057] It is preferable that the horizontal distance from the center of the trapping portion (22) to the surrounding member is greater than the sum of R1 mm and R2 mm. R2 is a value that is set in consideration of the thickness of sludge adhering to the outer surface of the trapping portion (22), and is set, for example, to a value that is slightly greater than the maximum thickness of sludge that is expected to adhere to the outer surface of the trapping portion (22). R2 is, for example, a value that is greater than or equal to 20 mm and less than or equal to 30 mm (20 mm≦R2≦30 mm). In this case, the sum of R1 mm and R2 mm is greater than or equal to 27.5 mm and less than or equal to 47.5 mm (27.5 mm≦R1+R2≦47.5 mm).

[0058] Such a configuration can prevent sludge from adhering to the surrounding members, which can prevent problems such as an increase in the temperature of the liquid (E) due to sludge adhering to the coil portion (15a) impeding heat exchange between the refrigerant and the liquid (E), an increase in power consumption of the cooling device (1), and a malfunction of the compressor (12) due to the return of the refrigerant liquid from the coil portion (15a).

[0059] In this embodiment, for example, taking into consideration the first example of the position of the capture portion and the second example of the position of the capture portion, the capture portion (22) may be placed in the region (α) shown in Fig. 5. The region (α) is a region that satisfies the condition shown in the first example of the position of the capture portion (the horizontal distance from the center of the capture portion (22) to the protrusion (D) is greater than R1 mm) and the condition shown in the second example of the position of the capture portion (the horizontal distance from the center of the capture portion (22) to the surrounding member is greater than the sum of R1 mm and R2 mm).

[0060] -Third example of catch position- As shown in FIG. 6, the capture section (22) may be disposed below the storage section (11) and upstream of the mainstream direction (Y). The mainstream direction (Y) is the direction from the inlet (P1) side of the tank (T) toward the outlet (P2) side, and indicates the mainstream of the liquid (E) generated in the tank (T). In this way, when the liquid (E) flows along the mainstream direction (Y) in the tank (T) and is sent downward in the storage section (11), the capture section (22) can adsorb sludge in the liquid (E) as early as possible. As a result, adhesion of sludge to the outer surface of the coil section (15a) can be effectively suppressed.

[0061] -Fourth example of catch position- 7(a), when the agitated flow (tributary) generated in the liquid (E) by the agitator (17) is a swirling flow, the liquid (E) flows around the axis of the shaft portion (17a), and the liquid level (E1) of the liquid (E) around the shaft portion (17a) drops around the agitator (17). In this case, the capture portion (22) is preferably disposed at a location separated from the agitator (17).

[0062] -Fifth example of catch position- 7(b), when the agitated flow generated in the liquid (E) by the agitator (17) is a circulating flow, the liquid (E) flows around the agitator (17) in a direction parallel to the shaft portion (17a) (up and down direction). In this case, the capture portion (22) is preferably disposed in the vicinity of the agitator (17).

[0063] -6th example of catch position- 7(c), when the agitation flow generated in the liquid (E) by the agitator (17) is a radial flow, the liquid (E) flows in a direction perpendicular to the shaft portion (17a) of the agitator (17) (horizontal direction) and away from the shaft portion (17a). In this case, the capture portion (22) is preferably disposed in the vicinity of the agitator (17).

[0064] - Procedure for cleaning the trap - As shown in Figures 1 and 3, the cooling device (1) is placed on the bottom surface (T1) of the tank (T), so that the coil portion (15a) and the trapping portion (22) are immersed in the liquid (E). The magnetic force of the magnet (22b) causes sludge in the liquid (E) to adhere to the outer surface of the trapping portion (22). As a result, the sludge is trapped by the trapping portion (22).

[0065] As shown in FIG. 8, the cooling device (1) is then pulled out of the tank (T), and the coil portion (15a) and the capture portion (22) are taken out of the liquid (E). The cooling device (1) pulled out of the tank (T) is placed on the floor surface (V). Next, the worker inserts his / her hand into the gap (C) between the coil portion (15a) and the lower surface (11a) of the storage portion (11), grasps the capture portion (22) with the hand, and rotates the capture portion (22) to loosen the screw (22a1), thereby removing the capture portion (22) from the storage portion (11) (see arrow H1 in FIG. 8). Next, the worker takes out the capture portion (22) from inside the coil portion (15a) through the gap (C) (see arrows H2 and H3 in FIG. 8). The operator then cleans the trap portion (22), such as by wiping the exterior surface of the trap portion (22) to remove sludge from the exterior surface of the trap portion (22).

[0066] Thereafter, the worker returns the capture portion (22) to the inside of the coil portion (15a) through the gap (C). Next, the worker butts the threads (22a1) of the capture portion (22) against the threads (11a1) of the storage portion (11) and rotates the capture portion (22). As a result, the threads (22a1) of the capture portion (22) are tightened against the threads (11a1) of the storage portion (11), and the capture portion (22) is attached to the storage portion (11).

[0067] As shown in Figures 1 and 3, the cooling device (1) is then returned to its original position, and the coil portion (15a) and the capture portion (22) are immersed in the liquid (E), thereby resuming the operation of collecting sludge from the liquid (E).

[0068] -effect- As described above, the cooling device (1) includes the refrigerant circuit (10) connecting the compressor (12), the condenser (13), the expansion mechanism (14), and the evaporator (15), the storage section (11) that stores the compressor (12), the condenser (13), and the expansion mechanism (14), and the trapping section (22, 112) that traps sludge in the liquid (E). The evaporator (15) includes the coil section (15a) that is disposed below the storage section (11). The trapping section (22, 112) is disposed below the storage section (11). In this manner, by disposing both the trapping section (22, 112) and the coil section (15a) below the storage section (11), the trapping section (22, 112) is disposed around the coil section (15a). As a result, by capturing the sludge around the coil portion (15a) by the capture portion (22, 112), it is possible to effectively prevent the sludge from adhering to the coil portion (15a). As a result, it is possible to prevent the need for a complicated task of removing the sludge that has adhered to places that are hard to reach, such as the inner periphery of the coil portion (15a), and therefore it is possible to improve the maintainability of the cooling device (1).

[0069] The trapping portion (22) can be reused by wiping off the sludge adhering to the surface of the trapping portion (22), and further, by using a magnet (22b) (permanent magnet) as the trapping portion (22), deterioration of the trapping portion (22) over time can be suppressed, thereby effectively improving the service life of the trapping portion (22).

[0070] Although the embodiments and modifications have been described above, it will be understood that various modifications of form and details are possible without departing from the spirit and scope of the claims (for example, (1)- below). Furthermore, the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate as long as the functionality of the subject matter of the present disclosure is not impaired.

[0071] (1) A plurality of attachment points for the capture portion (22) may be provided on the lower surface (11a) of the storage portion (11), and the attachment point for the capture portion (22) may be selected from the plurality of attachment points. That is, a plurality of screws (11a1) may be formed on the lower surface (11a) of the storage portion (11), and the screw (11a1) for fastening the capture portion (22) may be selected from the plurality of screws (11a1). This allows the attachment point for the capture portion (22) to be selected so that the capture portion (22) is installed in a desired location. The desired location may be, for example, a location where the horizontal distance from the center of the capture portion (22) to the protrusion portion (D) is greater than R1 mm (see FIG. 4), a location where the horizontal distance from the center of the capture portion (22) to the surrounding member is greater than the sum of R1 mm and R2 mm (see FIG. 4), a location located upstream of the main flow direction (Y) below the storage portion (11) (see FIG. 6), etc.

[0072] (2) In this embodiment, the capture part (22) is detachably attached to the lower surface (11a) of the storage part (11) by screws (11a1, 22a1) (see FIG. 3). However, the present invention is not limited to this. For example, a magnet may be provided at a mounting point of the capture part (22) with the storage part (11) and / or on the lower surface (11a) of the storage part (11), and the capture part (22) may be detachably attached to the lower surface (11a) of the storage part (11) by the magnetic force of the magnet.

[0073] (3) In this embodiment, the capture portion (22) is detachably attached to the lower surface (11a) of the storage portion (11) (see FIG. 3). However, the present invention is not limited to this. The capture portion (22) may be detachably attached to the leg portion (18) by, for example, a screw or a magnet.

[0074] (4) A first modified example of the trapping portion (22) will be described. In this embodiment, the trapping portion (22) includes a magnet (22b) and traps the sludge by adhering the sludge to the outer surface of the trapping portion (22) using the magnetic force of the magnet (22b) (see FIG. 3). However, the present invention is not limited to this. The trapping portion (22) may be configured to include a filter and capture the sludge in the liquid (E) by filtering the liquid (E) in the tank (T) through the filter. In this case, the sludge may be particles having a predetermined size that can be captured by the filter, and does not need to be magnetic.

[0075] (5) A capture part (112), which is a second modified example of the capture part (22), will be described.

[0076] The cooling device (1) includes a sludge collection device (100). As shown in Fig. 9, the sludge collection device (100) includes a cylinder portion (110), a magnet (120), a moving portion (130), a separating portion (140), an outer cylinder portion (150), and a flange portion (160). In Figs. 9, 12, and 13, the coil portion (15a) and the agitator (17) provided below the storage portion (11) are not shown.

[0077] The cylindrical portion (110) is a hollow member. The cylindrical portion (110) is made of a non-magnetic material. An opening (111) that communicates with the inside and outside of the cylindrical portion (110) is formed at one end (110a) of the cylindrical portion (110). The other end (110b) of the cylindrical portion (110) may be open so as to communicate with the inside and outside of the cylindrical portion (110), or may be closed. The other end (110b) side of the cylindrical portion (110) is disposed in the liquid (E) in the tank (T), and the one end (110a) side of the cylindrical portion (110) is disposed outside the liquid (E).

[0078] Hereinafter, the direction (X) in which the tubular portion (110) extends may be referred to as the tubular direction (X). In the tubular direction (X), the direction toward one end portion (110a) may be referred to as one side (X1), and the direction toward the other end portion (110b) may be referred to as the other side (X2).

[0079] 9, 10(a) and 10(b), holes (11a2, 11b1) that communicate between the inside and outside of the storage portion (11) are formed in the lower surface (11a) and the side surface (11b) of the storage portion (11). The tubular portion (110) is inserted into the storage portion (11) through the holes (11a2, 11b1).

[0080] The tubular portion (110) includes a capture portion (112), an outer liquid portion (113), and an insertion portion (114). The tubular portion (110) has a shape in which the insertion portion (114) is disposed within the storage portion (11), and the capture portion (112) and the outer liquid portion (113) protrude outward from the storage portion (11).

[0081] The capture portion (112) is a portion of the tube portion (110) near the other end portion (110b), and is immersed in the liquid (E) in the tank (T). The capture portion (112) is separate from the coil portion (15a), and is disposed below the storage portion (11). The capture portion (112) is located at a distance from the coil portion (15a). The capture portion (112) is disposed inside the coil portion (15a) (see FIG. 3).

[0082] The outside liquid portion (113) is a portion of the tubular portion (110) near the one end portion (110a) and is present outside the liquid (E) (in the atmosphere). The outside liquid portion (113) is disposed outside the container portion (11) and protrudes from the container portion (11).

[0083] The insertion portion (114) is a portion of the tube portion (110) that is located between the capture portion (112) and the outer liquid portion (113) and is disposed within the storage portion (11). The insertion portion (114) has a shape that is bent or curved at approximately a right angle.

[0084] The outer liquid portion (113) includes a horizontal portion (113a). The horizontal portion (113a) is a portion of the outer liquid portion (113) that extends in the horizontal direction.

[0085] The magnet (120) is a permanent magnet. The magnet (120) has a spherical shape. A plurality of magnets (120) are provided inside the cylindrical portion (110) so as to be aligned along the cylindrical direction (X). The shape of the magnet (120) is not particularly limited. The number of magnets (120) provided inside the cylindrical portion (110) is not particularly limited, and may be multiple or single.

[0086] The moving part (130) is a member for moving the magnet (120) in the cylindrical part (110) along the cylindrical direction (X). The moving part (130) is a string-like member. The moving part (130) is formed, for example, from nylon. The material of the moving part (130) is not particularly limited. One end (131) of the moving part (130) is connected to the magnet (120) in the cylindrical part (110). The other end (132) of the moving part (130) extends to the outside of the cylindrical part (110) through the opening (111) of the cylindrical part (110). An operator or the like can grasp the other end (132) of the moving part (130) and pull the moving part (130).

[0087] 9 and 11(a), the separation portion (140) is provided on the outer surface of the horizontal portion (113a) and has a shape that protrudes outward from the outer surface of the horizontal portion (113a). The separation portion (140) is formed in an annular shape along the circumferential direction of the horizontal portion (113a) and is a plate-like member that protrudes radially from the outer surface of the horizontal portion (113a) in a direction perpendicular to the tubular direction (X).

[0088] As shown in FIGS. 9, 10(a), 10(b), and 11(b), the outer cylinder portion (150) is a cylindrical member having openings (151, 152) at both ends. The cylinder portion (110) is inserted into the outer cylinder portion (150) through the openings (151, 152). The outer cylinder portion (150) and the cylinder portion (110) form a double pipe. The opening (151) at one end of the outer cylinder portion (150) is located below the lower surface (11a) of the storage portion (11). The opening (152) at the other end of the outer cylinder portion (150) communicates with a hole (11b1) in the side surface (11b) of the storage portion (11).

[0089] Hereinafter, the space between the outer tubular portion (150) and the tubular portion (110) may be referred to as a passage (170).

[0090] The outer cylinder portion (150) is inserted into the storage portion (11) through a hole (11a2) in the lower surface (11a) of the storage portion (11). The outer cylinder portion (150) includes a first outer cylinder portion (153) and a second outer cylinder portion (154). The first outer cylinder portion (153) is located inside the storage portion (11) and covers the insertion portion (114) of the cylinder portion (110). The second outer cylinder portion (154) is located outside the storage portion (11) and covers a portion of the cylinder portion (110) that extends from the insertion portion (114) toward the capture portion (112).

[0091] 9 and 11(b), the flange portion (160) is provided on the outer surface of the second outer cylinder portion (154) and has a shape that protrudes outward from the outer surface of the second outer cylinder portion (154). The flange portion (160) is formed in an annular shape along the circumferential direction of the second outer cylinder portion (154), and is a plate-like member that protrudes radially from the outer surface of the second outer cylinder portion (154) in a direction perpendicular to the cylindrical direction (X).

[0092] The procedure for recovering sludge from the liquid (E) using the sludge recovery device (100) will now be described.

[0093] As shown in Fig. 9, when the capture portion (112) of the tubular portion (110) is immersed in the liquid (E) and disposed inside the coil portion (15a), the liquid exterior (113) is disposed in the atmosphere outside the liquid (E), and a magnet (120) is disposed inside the capture portion (112) of the tubular portion (110), sludge (G) in the liquid (E) adheres to the outer surface of the capture portion (112) due to the magnetic force of the magnet (120). The sludge (G) adheres to the portion of the outer surface of the capture portion (112) that is located around the magnet (120). As a result, the sludge (G) is captured by the capture portion (112).

[0094] When the other end (132) of the moving part (130) is gripped and the moving part (130) is pulled, the magnet (120) in the tubular part (110) moves in one direction (X1) in the tubular direction (X), and accordingly, the sludge (G) adhering to the outer surface of the tubular part (110) due to the magnetic force of the magnet (120) also moves in the one direction (X1) in the tubular direction (X).

[0095] As shown in Fig. 12, the moving part (130) is pulled further, and the magnet moves to a place in the tubular part (110) where the tubular part (110) and the outer tubular part (150) form a double pipe. As a result, the sludge (G) that has adhered to the outer surface of the capture part (112) by the magnetic force of the magnet (120) enters the passage (170) through the opening (151) of the outer tubular part (150) and moves inside the passage (170). At this time, the sludge (G) that does not enter the passage (170) is blocked by the flange part (160), and thus it is possible to prevent the sludge (G) from moving toward the storage part (11) and adhering to the lower surface (11a) of the storage part (11). In addition, within the storage section (11), the sludge (G) moves through the passage (170) covered by the outer cylinder portion (150), thereby preventing the sludge (G) from leaking down into the storage section (11) and remaining therein.

[0096] The moving part (130) is further pulled, and the magnet (120) moves to a position within the tubular part (110) where the outer liquid part (113) is located. As a result, the sludge (G) that had been moving within the passage (170) also comes out of the passage (170) through the opening (152) of the outer tubular part (150) and adheres to the outer surface of the outer liquid part (113).

[0097] As shown in Fig. 13, when the moving part (130) is pulled further, the sludge (G) that has been moving together with the tubular part (110) due to the magnetic force of the magnet (120) in the tubular direction (X) is stuck to the separation part (140) and stops, while the magnet (120) passes through the separation part (140). This causes the magnet (120) moved by the moving part (130) to be separated from the sludge (G) adhering to the outer surface of the tubular part (110). As a result, the magnet (120) is separated from the sludge (G), and the magnetic force of the magnet (120) acting on the sludge (G) is suppressed.

[0098] By suppressing the magnetic force of the magnet (120) acting on the sludge (G), the sludge (G) falls from the separation section (140) under its own weight and is collected in the container (Z). As a result, the sludge (G) in the liquid (E) can be collected, and an increase in the sludge (G) in the liquid (E) can be suppressed.

[0099] The descriptions "first," "second," "third," etc. mentioned above are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words. [Industrial Applicability]

[0100] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for cooling devices. [Explanation of symbols]

[0101] 1 Cooling device 10 Refrigerant circuit 11 Storage unit 12 Compressor 13 Condenser 14 Expansion mechanism 15 Evaporator 15a Coil section 22 Capture Department 112 Capture Department E liquid

Claims

1. a refrigerant circuit (10) in which a compressor (12), a condenser (13), an expansion mechanism (14), and an evaporator (15) are connected; an accommodation section (11) that accommodates the compressor (12), the condenser (13), and the expansion mechanism (14); a coil portion (15a) included in the evaporator (15), disposed below the storage portion (11), and immersed in the liquid (E) to cool the liquid (E); a trapping portion (22, 112) for trapping sludge in the liquid (E); Equipped with The capture portion (22, 112) is disposed below the storage portion (11).

2. The cooling device according to claim 1, wherein the trapping portion (22) includes a magnet (22b) and traps the sludge by a magnetic force of the magnet (22b).

3. The cooling device according to claim 1 or 2, wherein the capture portion (22, 112) is arranged inside the coil portion (15a).

4. an agitator (17) disposed inside the coil portion (15a) and agitating the liquid (E) to generate an agitated flow in the liquid (E); The cooling device according to claim 3 , wherein the capture portion (22) is disposed within a region in which the agitating flow occurs.

5. The cooling device according to claim 1 or 2, wherein the capture portion (22) has a rod shape extending in the vertical direction.

6. The cooling device according to claim 5 , wherein the capture portion (22) has a circular outer shape in a cross section perpendicular to the up-down direction.

7. 3. The cooling device according to claim 1 or 2, wherein the capture portion (22) is detachably attached to the storage portion (11) or to a leg portion (18) provided on a lower surface (11a) of the storage portion (11).

8. The cooling device according to claim 7, wherein the storage portion (11) or the leg portion (18) is provided with a plurality of locations where the capture portion (22) can be attached.

9. 3. The cooling device according to claim 1, wherein a lower end of the capture portion (22) is located lower than a lower end of the coil portion (15a).

10. the capture portion (22) is disposed inside the coil portion (15a) and is detachably attached to a lower surface (11a) of the storage portion (11); The cooling device according to claim 1 or 2, wherein a gap (C) is provided between the coil portion (15a) and a lower surface (11a) of the accommodation portion (11).

11. a non-magnetic cylindrical portion (110); a magnet (120) provided in the cylindrical portion (110) and configured to cause the sludge to adhere to an outer surface of the cylindrical portion (110) by magnetic force; a moving portion (130) for moving the magnet (120) inside the cylindrical portion (110); a separating section (140) that separates the magnet (120) moved by the moving section (130) from the sludge adhering to the outer surface of the cylindrical section (110); Equipped with the moving portion (130) includes a string-like member that is connected to the magnet (120) and extends to the outside of the cylindrical portion (110) through an opening (111) at one end (110a) of the cylindrical portion (110); The cooling device according to claim 1 , wherein the tubular portion (110) includes the capture portion (112) that is immersed in the liquid (E).

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