Exhaust device and ground freezing system

Abstract

To provide an exhaust device and a ground freezing system, which can suppress reduction in efficiency of freezing cycle of a freezer caused by air temperature around an intake side of a heat discharge device exceeding an appropriate temperature range of the heat discharge device.SOLUTION: An exhaust device 100 comprises: a duct 110 extending in a pit 3 from a first position X1 on an exhaust side of a heat discharge device 80 installed in the pit 3 in order to discharge heat of a freezing cycle of a freezer 10 to the outside of a system along an extending direction of the pit 3 to a second position X2 farther distant from the heat discharge device 80 than the first position X1; and a fan 130 to introduce exhaust air of the heat discharge device 80 to the second position X2 in the pit 3 through the duct 110.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to exhaust devices and ground freezing systems. [Background technology]

[0002] A ground freezing method has been known for stabilizing the ground excavated during tunnel construction, in which a refrigerant cooled by a refrigeration cycle in a refrigerator is supplied to freezing pipes installed in the ground. Because the refrigeration cycle needs to release the heat removed from the refrigerant used for freezing the ground outside the system, a heat dissipation device is attached to the refrigerator.

[0003] For example, Patent Document 1 describes a ground freezing method that uses a cooling device for cooling CO2 as a refrigerant. Specifically, the cooling device includes a CO2 liquefier and a condenser as refrigeration cycle components, and a cooling tower (heat dissipation device) that releases heat from the refrigeration cycle via water (cooling water). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-148104 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, heat dissipation devices such as the cooling tower of Patent Document 1 exchange heat between the air taken into the heat dissipation device and the cooling water. If the temperature of the air taken into the heat dissipation device is within a temperature range suitable for cooling the cooling water, the heat dissipation device can appropriately release the heat of the refrigeration cycle of the refrigerator.

[0006] However, when a radiator is installed inside a tunnel, the accumulation of high-temperature exhaust air can cause the temperature of the air around the radiator's intake side to exceed the radiator's appropriate temperature range. The rise in the radiator's intake temperature inhibits the heat dissipation of the refrigerator's refrigeration cycle, leading to an increase in the refrigerator's high-pressure side pressure. When the refrigerator's high-pressure side pressure rises, not only does the increased compression power (power consumption) reduce the refrigeration cycle's efficiency (COP), but the increased high-pressure side pressure can also cause the refrigerator to shut down.

[0007] In view of the above circumstances, at least some embodiments of the present invention aim to provide an exhaust device and a ground freezing system that can suppress a decrease in the efficiency of the refrigeration cycle of a refrigerator caused by the temperature of the air around the intake side of the heat dissipation device exceeding the appropriate temperature range of the heat dissipation device. [Means for solving the problem]

[0008] In some embodiments, the exhaust system includes: An exhaust device for a ground freezing system that freezes the ground by supplying a refrigerant cooled by a refrigerator installed in a mine to a freezing pipe in the mine, a duct extending in the tunnel from a first position on the exhaust side of a heat dissipation device installed in the tunnel to dissipate heat from the refrigeration cycle of the refrigerator to a second position farther from the heat dissipation device than the first position, along the tunnel extension direction; a fan that directs the exhaust air from the heat dissipation device through a duct to a second location in the mine; Equipped with.

[0009] In some embodiments, the ground freezing system includes: A freezing pipe that freezes the ground inside the tunnel; a refrigerator installed inside the mine that cools the refrigerant supplied to the freezing pipes; a heat dissipation device that is installed inside the mine and configured to dissipate heat from the refrigeration cycle of the refrigerator to the outside of the system; the exhaust device described above; Equipped with. [Effects of the Invention]

[0010] Because the exhaust air from the radiator is guided to a second location in the tunnel away from the radiator, the air temperature around the radiator's intake side is less likely to exceed the appropriate temperature range for the radiator, thereby preventing a decrease in the efficiency of the refrigeration cycle of the refrigerator due to an increase in high-pressure side pressure. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a diagram showing the overall configuration of a ground freezing system according to one embodiment. FIG. [Figure 2] 2 is a perspective view showing the relationship between an exhaust port of a heat dissipation device and an inlet of an exhaust device according to an embodiment; FIG. [Figure 3] 1 is a diagram illustrating a relationship between an exhaust port of a heat dissipation device and an inlet of an exhaust device when viewed from a normal direction of the exhaust port of a heat dissipation device according to an embodiment. FIG. [Figure 4] FIG. 2 is a diagram showing a schematic cross section of the ground freezing system along a direction perpendicular to the extension direction of the tunnel. [Figure 5A] 1 is a perspective view illustrating a heat dissipation device and an exhaust device according to an embodiment, viewed from the rear side of the heat dissipation device. [Figure 5B] 1 is a perspective view illustrating a heat dissipation device and an exhaust device according to an embodiment, viewed from the front side of the heat dissipation device; DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0013] Hereinafter, exhaust devices and ground freezing systems according to several embodiments will be described with reference to the drawings.

[0014] Fig. 1 is a diagram showing the overall configuration of a ground freezing system according to one embodiment. Fig. 1 shows an X-axis along the extension direction of a tunnel 3, and the origin of this X-axis coordinate is the position of an exhaust port 88 of a heat dissipation device 80, which will be described later.

[0015] In some embodiments, as shown in FIG. 1, the ground freezing system 1 includes a refrigerator 10, a freezing pipe 70 that receives a supply of refrigerant from the refrigerator 10, a heat dissipation device 80 connected to the refrigerator 10, and an exhaust device 100 for directing exhaust air from the heat dissipation device 80.

[0016] The ground freezing system 1 is installed in a pit 3. The pit 3 is a horizontal pit with a circular cross section, and a foundation 7 is provided in the pit 3 to form a horizontal surface. In addition, ventilation (for example, at a flow rate of about 0.3 m / s) may be performed by supplying air from outside the pit 3 so that workers can work inside the pit 3. The direction V of this ventilation may be along the extension direction of the pit 3, as shown in FIG.

[0017] The refrigerator 10 has a refrigeration cycle for cooling the refrigerant supplied to the freezing pipe 70 . In some embodiments, the refrigerator 10 is an indirect cooling refrigerator having a system in which the refrigerant circulating in the refrigeration cycle (hereinafter referred to as the "primary refrigerant") and the refrigerant supplied to the freezing pipe 70 (hereinafter referred to as the "secondary refrigerant") are different systems. The refrigerator 10 includes, as refrigeration cycle components, a primary refrigerant line 12 that circulates a primary refrigerant that exchanges heat with a secondary refrigerant, and a compressor 14, a condenser 16, an expansion valve 18, and an evaporator 20 that are provided in the primary refrigerant line 12. The compressor 14 compresses the primary refrigerant and discharges it into the primary refrigerant line 12. The condenser 16 cools the primary refrigerant by heat exchange between the cooling water (described below) guided from the heat dissipation device 80 and the primary refrigerant discharged from the compressor 14. The primary refrigerant that passes through the condenser 16 is decompressed by the expansion valve 18. The evaporator 20 exchanges heat between the decompressed primary refrigerant and the secondary refrigerant. The secondary refrigerant is cooled by the heat exchange in the evaporator 20. The primary refrigerant may be, for example, an NH3 refrigerant, while the secondary refrigerant may be, for example, a CO2 refrigerant.

[0018] The secondary refrigerant cooled by the refrigerator 10 is stored in the receiver 30 via a secondary refrigerant re-liquefaction line 32 .

[0019] In addition to the secondary refrigerant reliquefaction line 32, a secondary refrigerant line 40 is also connected to the receiver 30. The secondary refrigerant line 40 includes an outgoing path 40A provided with a secondary refrigerant supply pump 42, and a returning path 40B. The outgoing path 40A of the secondary refrigerant line 40 is connected to a feed header 50A for branching the secondary refrigerant to multiple freezing pipes 70, and multiple feed pipes 60A are provided between the feed header 50A and the multiple freezing pipes 70. In this way, the outgoing path 40A of the secondary refrigerant line 40 communicates with the freezing pipes 70 via the feed header 50A and the feed pipes 60A. The secondary refrigerant in the receiver 30 is sent from the receiver 30 to the freezing pipes 70 by a secondary refrigerant supply pump 42. Similarly, the return path 40B of the secondary refrigerant line 40 communicates with the freezing pipe 70 via a return header 50B and a return pipe 60B. The secondary refrigerant that has passed through the freezing pipe 70 returns to the receiver 30 via the return path 40B of the secondary refrigerant line 40. In this way, the secondary refrigerant circulates between the freezing pipe 70 and the receiver 30.

[0020] Freezing pipe 70 is installed in ground 5 of tunnel 3, and includes an outer cylinder 72 and refrigerant piping 74 provided inside outer cylinder 72. Refrigerant piping 74 is formed so as to be folded back inside outer cylinder 72, with one end of refrigerant piping 74 connected to delivery piping 60A and the other end of refrigerant piping 74 connected to return piping 60B. The freezing pipe 70 also has a space 76 between the outer cylinder 72 and the refrigerant pipe 74. The space 76 may be filled with a fluid (for example, water) that has a higher thermal conductivity than air. When water is used as the fluid filling the space 76, the water in the space 76 is frozen by the refrigerant flowing through the refrigerant pipe 74. The water (ice) in the frozen space 76 cools and freezes the ground 5. In the embodiment shown in FIG. 1, the freezing pipe 70 is buried in the ground 5 of the pit 3 . In another embodiment, the freezing pipe 70 may be installed on the surface of the ground 5 of the pit 3. When the freezing pipe 70 is installed on the surface of the ground 5 of the pit 3, the freezing pipe 70 may not include the outer casing 72 and may be attached to the surface of the ground 5 of the pit 3 as a refrigerant pipe 74.

[0021] The radiator 80 is connected to the condenser 16 of the chiller 10 via a heat radiation line 82 provided with a cooling water pump 84. Cooling water flows through the heat radiation line 82. The cooling water removes heat from the primary refrigerant in the condenser 16. The cooling water that passes through the condenser 16 is cooled by heat exchange with intake air drawn in from around an intake port 86 of the radiator 80. The cooling water cooled by the radiator 80 is returned to the condenser 16 via the heat radiation line 82. Meanwhile, the air that has removed heat from the cooling water is discharged from an exhaust port 88 of the radiator 80. In this way, the radiator 80 releases heat from the refrigeration cycle of the chiller 10 to the outside of the refrigeration cycle system. 1, openings provided in the casing of the heat dissipation device 80 form the intake port 86 and the exhaust port 88 of the heat dissipation device 80. In other embodiments, the exhaust port 88 of the heat dissipation device 80 is formed by an exhaust guide member connected to the surface of the casing of the heat dissipation device 80 where the exhaust side opening is formed. Note that the exhaust guide member may be an extension pipe or a hood that connects the exhaust side opening of the casing of the heat dissipation device 80 and the exhaust port 88.

[0022] In the embodiment shown in FIG. 1, the heat dissipation device 80 is a dry cooler that dissipates heat from the coolant by heat exchange between intake air and the coolant without using water evaporation. The dry cooler as the heat dissipation device 80 includes a heat transfer tube 90 that forms part of the heat dissipation line 82, and an exhaust fan 92 that guides intake air from an intake port 86 of the dry cooler to an exhaust port 88. The dry cooler as the heat dissipation device 80 exchanges heat between the cooling water flowing inside the heat transfer tube 90 and the intake air flowing outside the heat transfer tube 90. In another embodiment, the heat dissipation device 80 may be a cooling tower that, as opposed to a dry cooler, utilizes water evaporation to dissipate heat from the cooling water by exchanging heat between the intake air and the cooling water.

[0023] In some embodiments, as shown in FIG. 1, the exhaust device 100 includes a duct 110 and a fan 130 that directs the exhaust air of the heat dissipation device 80 through the duct 110 .

[0024] The duct 110 includes an upstream end 112 located near the exhaust port 88 of the heat dissipation device 80 and a downstream end 114 located at a location within the tunnel 3 farther from the heat dissipation device 80 than the upstream end 112, and is open at each of the upstream end 112 and the downstream end 114. 1, an opening at an upstream end 112 of the duct 110 forms the inlet 102 of the exhaust device 100, and an opening at a downstream end 114 of the duct 110 forms the outlet 104 of the exhaust device 100. In other embodiments, the inlet 102 of the exhaust device 100 is formed by an exhaust guide member connected to the upstream end 112 of the duct 110. The exhaust guide member may be an exhaust chamber 140 or an extension pipe, described below, that connects the opening at the upstream end 112 of the duct 110 and the inlet 102 of the exhaust device 100. As will be described in detail below, the inlet 102 of the exhaust device 100 is positioned to face the exhaust port 88 of the heat dissipation device 80, as shown in FIG. 1.

[0025] The upstream end 112 of the duct 110 is located at a first position X1 on the X-axis coordinate system, with the position of the exhaust port 88 of the heat dissipation device 80 as the origin (X=0). In the embodiment shown in FIG. 1, the first position X1 is a position away from the origin (X1>0), and the inlet 102 of the exhaust device 100 formed by the upstream end 112 of the duct 110 is located away from the exhaust port 88 of the heat dissipation device 80. In another embodiment, the first position X1 coincides with the origin (X1=0), and the inlet 102 of the exhaust device 100 formed by the upstream end 112 of the duct 110 is connected to the exhaust port 88 of the heat dissipation device 80.

[0026] The downstream end 114 of the duct 110 is located at a second position X2 that is farther from the origin than the first position X1 on the X-axis coordinate system, with the exhaust port 88 of the heat dissipation device 80 as the origin. The distance (X2-X1) between the first position X1 and the second position X2 is set to 10 m or more, preferably 20 m or more.

[0027] The duct 110 extends within the tunnel 3 along the extension direction of the tunnel 3 from a first position X1 to a second position X2. 1, the duct 110 extends from a first position X1 to a second position X2 within the mine 3 downstream in the ventilation direction V within the mine 3. In this case, the distance (X2-X1) between the first position X1 and the second position X2 may be set to 5 m or more, preferably 10 m or more. The cross-sectional shape of the duct 110 is not particularly limited, but may be, for example, a circular or rectangular shape.

[0028] The fan 130 guides the exhaust air from the heat dissipation device 80 through the duct 110 to a second position X2 in the mine 3. The fan 130 may be provided within the duct 110 or may be assembled to the duct 110 by connecting the casing of the fan 130 with the body of the duct 110 . In the embodiment shown in FIG. 1, the fan 130 is disposed within the duct 110 at the downstream end 114 of the duct 110 .

[0029] The exhaust air from the heat dissipation device 80 is taken into the exhaust device 100 through an inlet 102 of the exhaust device 100 by a fan 130. The exhaust air taken into the exhaust device 100 passes through a duct 110 and is discharged from an outlet 104 of the exhaust device 100 formed at a downstream end 114 of the duct 110.

[0030] As described above, from the viewpoint of promoting the intake of exhaust air from the heat dissipation device 80 into the exhaust device 100, the inlet 102 of the exhaust device 100 is disposed opposite the exhaust port 88 of the heat dissipation device 80. The relative positions and dimensional relationship between the inlet 102 of the exhaust device 100 and the exhaust port 88 of the heat dissipation device 80 will be described in detail below with reference to FIGS. 2 and 3.

[0031] FIG. 2 is a perspective view showing the relationship between the exhaust port of the heat dissipation device and the inlet of the exhaust device according to one embodiment. FIG. 3 is a diagram showing the relationship between the exhaust port of the heat dissipation device and the inlet of the exhaust device when viewed from a normal line of the exhaust port of the heat dissipation device according to one embodiment.

[0032] 2 and 3, the inlet 102 of the exhaust device 100 has a normal N1 passing through the center of the inlet 102, a horizontal length (width) W1 of the inlet 102, and a vertical length (height) H1 of the inlet 102. Similarly, the exhaust port 88 of the heat dissipation device 80 has a normal N0, a width W0, and a height H0.

[0033] In some embodiments, as shown in FIG. 2, the inlet 102 of the exhaust device 100 is positioned so that the normal to the inlet 102 extends along the normal direction of the exhaust outlet 88 of the heat dissipation device 80 (the angle between the normal N1 of the inlet 102 and the normal N0 of the exhaust outlet 88 is greater than or equal to 0 degrees and less than or equal to 45 degrees). In one embodiment, the normal N1 of the inlet 102 of the exhaust device 100 is coincident with or parallel to the normal N0 of the exhaust outlet 88 of the heat dissipation device 80. In the example shown in Figure 2, the normal N1 of the inlet 102 of the exhaust device 100 and the normal N0 of the exhaust outlet 88 of the heat dissipation device 80 are coincident with each other.

[0034] In some embodiments, the distance L between the center of the inlet 102 of the exhaust device 100 and the center of the exhaust port 88 in the normal direction of the exhaust port 88 of the heat dissipation device 80 satisfies at least one of the conditions 0≦L≦2W0 or 0≦L≦2H0.

[0035] In some embodiments, as shown in FIG. 3, the inlet 102 of the exhaust device 100 is positioned to at least partially overlap the exhaust port 88 of the heat dissipation device 80 when viewed from a normal direction of the exhaust port 88. In the embodiment shown in FIG. 3, the inlet 102 of the exhaust device 100 is disposed so as to entirely overlap the exhaust port 88 of the heat dissipation device 80 when viewed from the normal direction of the exhaust port 88. In another embodiment, the inlet 102 of the exhaust device 100 partially overlaps the exhaust port 88 of the heat dissipation device 80 when viewed from a normal direction of the exhaust port 88. In this case, a part of the exhaust port 88 of the heat dissipation device 80 is located outside the inlet 102 of the exhaust device 100.

[0036] In some embodiments, the outlet 88 of the heat dissipation device 80 and the inlet 102 of the exhaust device 100 satisfy at least one of the following conditions: 0.8W0≦W1≦1.2W0 or 0.8H0≦H1≦1.2H0.

[0037] Specific configurations of the heat dissipation device 80 and the exhaust device 100 will now be described with reference to FIGS. 4 to 5B. FIG. 4 is a schematic diagram showing a cross section of the ground freezing system along a direction perpendicular to the extension direction of the tunnel. 5A and 5B are perspective views of a heat dissipation device and an exhaust device according to an embodiment, shown from the rear side and front side, respectively.

[0038] As shown in Figure 4, a rail system 9 is installed on a foundation 7 inside the tunnel 3 to allow vehicles to travel inside the tunnel 3. The rail system 9 extends along the extension direction of the tunnel 3. Vehicles traveling on the rail system 9 are used to transport excavated earth and materials. The heat dissipation device 80 is installed on the foundation 7 between the wall 4 of the tunnel 3 and the rail installation 9 .

[0039] As shown in Figures 4 to 5B, the heat dissipation device 80 has a front surface 94 facing the central axis O of the tunnel 3, a back surface 95 located between the front surface 94 and the wall surface 4 of the tunnel 3, and a side surface 96 and a top surface 97 connecting the front surface 94 and the back surface 95. The front surface 94, back surface 95, and top surface 97 of the heat dissipation device 80 are surfaces that run along the extension direction of the tunnel 3. The side surface 96 of the heat dissipation device 80 is a surface that is perpendicular to the extension direction of the tunnel 3.

[0040] The heat dissipation device 80 has an air intake port 86 on any one of the front surface 94, rear surface 95, side surface 96, and top surface 97. The heat dissipation device 80 has an air exhaust port 88 on any one of the front surface 94, rear surface 95, side surface 96, and top surface 97 on which the air intake port 86 is not provided. In the embodiment shown in FIGS. 4 to 5B , the air intake port 86 of the heat dissipation device 80 is provided on the front surface 94, and the air exhaust port 88 is provided on the rear surface 95.

[0041] In some embodiments, exhaust device 100 includes an exhaust chamber 140 disposed on the exhaust side of heat dissipation device 80, as shown in Figures 4-5B. 4 to 5B, the exhaust chamber 140 and the duct 110 are arranged in the space S between the rear surface 95 of the heat dissipation device 80 and the wall surface 4 of the mine 3. If the exhaust device 100 does not include the exhaust chamber 140, the duct 110 may be arranged in the space S between the rear surface 95 of the heat dissipation device 80 and the wall surface 4 of the mine 3.

[0042] The exhaust chamber 140 includes an exhaust chamber inlet 142 that forms the inlet 102 of the exhaust device 100 and an exhaust chamber outlet 148 that is connected to the upstream end 112 of the duct 110 .

[0043] In the embodiment shown in FIG. 4, the exhaust chamber inlet 142 forming the inlet 102 of the exhaust device 100 is not connected to the rear surface 95 of the heat dissipation device 80 . 5A and 5B, exhaust chamber inlet 142 of exhaust chamber 140 is provided with connection portion 144, and exhaust chamber inlet 142 is connected to rear surface 95 of heat dissipation device 80 via connection portion 144. In the exemplary embodiment shown in FIGS. 5A and 5B, connection portion 144 of exhaust chamber 140 is a flange provided at exhaust chamber inlet 142. Connection portion 144 of exhaust chamber 140 is fixed to rear surface 95 of heat dissipation device 80 by fastening member 146.

[0044] The exhaust chamber outlet 148 of the exhaust chamber 140 is connected to the upstream end 112 of the duct 110 at a first location X1, as shown in Figures 4 to 5B. The upstream end 112 of the duct 110 is provided with a connection 116. In the exemplary embodiment shown in Figures 5A and 5B, the connection 116 of the duct 110 is a flange provided at the upstream end 112. The connection 116 of the duct 110 is fixed to the body of the exhaust chamber 140 by a fastener 118. It should be noted that the direction in which duct 110 extends from the main body of exhaust chamber 140 is not particularly limited. In the embodiment shown in Figures 4 to 5B, duct 110 extends from the main body of exhaust chamber 140 toward the top of tunnel 3. In other embodiments, duct 110 may extend from the main body of exhaust chamber 140 along the extension direction of tunnel 3, or may extend toward foundation 7, or may extend toward wall surface 4 of tunnel 3.

[0045] In some embodiments, the duct 110 includes an upstream section 120 having an upstream end 112, an intermediate section 122 located downstream of the upstream section 120, and a downstream section 124 having a downstream end 114, as shown in Figures 5A and 5B. The duct 110 may be formed by integrally forming the upstream portion 120, the intermediate portion 122, and the downstream portion 124, or by connecting the upstream portion 120, the intermediate portion 122, and the downstream portion 124 to one another.

[0046] In the embodiment shown in Figures 5A and 5B, the upstream portion 120 of the duct 110 extends from the main body of the exhaust chamber 140 toward the top of the tunnel 3 and bends toward the extension direction of the tunnel 3 at a height position that does not interfere with the wall surface 4 of the tunnel 3. The intermediate portion 122 of the duct 110 extends along the extension direction of the tunnel 3 while maintaining the height position of the connection portion 126 with the upstream portion 120. The downstream section 124 of the duct 110 extends along the extension direction of the tunnel 3, varying in height from the connection 128 with the intermediate section 122 toward the foundation 7. In the exemplary embodiment shown in Figure 5B, the downstream section 124 is a flexible duct.

[0047] In some embodiments, the exhaust device 100 is held to the wall 4 or foundation 7 of the well 3 via a holding member 150 . In the embodiment shown in FIGS. 4 to 5B, the exhaust chamber 140 of the exhaust device 100 may be held on the base 7 by a mount (not shown) serving as a holding member 150. 5A and 5B, the duct 110 of the exhaust device 100 is held to the wall surface 4 of the tunnel 3 via a saddle band 150A serving as a holding member 150. The duct 110 of the exhaust device 100 is also held to the foundation 7 via a floor band 150B serving as a holding member 150. In other embodiments, the holding member 150 is not particularly limited and may be a suspension band or a bracket.

[0048] The characteristic configurations of the exhaust device and ground freezing system according to the above-described several embodiments can be summarized as follows.

[0049] [1] In some embodiments, the exhaust device (100) comprises: An exhaust device (100) for a ground freezing system (1) that freezes the ground by supplying a refrigerant cooled by a refrigerator (10) installed in a tunnel (3) to a freezing pipe (70) in the tunnel (3), a duct (110) extending in the tunnel (3) along the extension direction of the tunnel (3) from a first position (X1) on the exhaust side of a heat dissipation device (80) installed in the tunnel (3) for dissipating heat of the refrigeration cycle of the refrigerator (10) to the outside of the system, to a second position (X2) farther from the heat dissipation device (80) than the first position (X1); a fan (130) that guides the exhaust air from the heat dissipation device (80) through a duct (110) to a second position (X2) in the well (3); Equipped with.

[0050] If the temperature of the air around the intake side of the heat dissipation device (80) increases due to the accumulation of exhaust gas in the heat dissipation device (80), the heat dissipation to the outside of the refrigeration cycle is hindered, leading to an increase in the high-pressure side pressure of the refrigerator (10). If the high-pressure side pressure of the refrigerator (10) increases, not only will the efficiency (COP) of the refrigeration cycle decrease due to an increase in compression power (power consumption), but the increase in the high-pressure side pressure may also cause the refrigerator (10) to stop. In this regard, according to the configuration [1], the exhaust air from the heat dissipation device (80) is guided to the second position (X2) in the well (3) away from the heat dissipation device (80), so that the temperature of the air around the intake side of the heat dissipation device (80) can be maintained within an appropriate temperature range for the heat dissipation device (80). As a result, a decrease in the efficiency of the refrigeration cycle of the refrigerator (10) due to an increase in the high-pressure side pressure can be suppressed.

[0051] [2] In some embodiments, in the configuration of [1] above, The duct (110) extends downstream in the ventilation direction (V) within the well (3) from a first position (X1) to a second position (X2).

[0052] In the tunnel (3) in which the ground freezing system (1) is installed, ventilation is sometimes performed by supplying air from outside the tunnel (3) so that workers can work there. In this case, according to the configuration [2], the exhaust air from the heat dissipation device (80) flowing out of the duct (110) at the second position (X2) is accompanied by the ventilation flow in the well (3) and moves further away from the heat dissipation device (80). This makes it possible to reduce the length of the duct (110) required to prevent an increase in the temperature of the air around the intake side due to the exhaust air from the heat dissipation device (80), and thus to suppress a decrease in the efficiency of the refrigeration cycle at low cost.

[0053] [3] In some embodiments, in the configuration of [1] or [2] above, an exhaust chamber (140) provided on the exhaust side of the heat dissipation device (80); The duct (110) is connected to the exhaust chamber (140) at a first location (X1).

[0054] The configuration [3] above promotes movement of the exhaust air of the heat dissipation device (80) from the first position (X1) to the second position (X2) through the duct (110), thereby reliably maintaining the temperature of the air around the intake side of the heat dissipation device (80) within an appropriate temperature range for the heat dissipation device (80). As a result, a decrease in the efficiency of the refrigeration cycle of the refrigerator (10) due to an increase in the high-pressure side pressure can be effectively suppressed.

[0055] [4] In some embodiments, the ground freezing system (1) includes: a freezing pipe (70) for freezing the ground (5) in the tunnel (3); a refrigerator (10) installed in the tunnel (3) for cooling a refrigerant to be supplied to the freezing pipe (70); a heat dissipation device (80) installed in the tunnel (3) and configured to dissipate heat generated by the refrigeration cycle of the refrigerator (10) to the outside of the system; An exhaust device (100) according to any one of [1] to [3] above; Equipped with.

[0056] If the temperature of the air around the intake side of the heat dissipation device (80) increases due to the accumulation of exhaust gas in the heat dissipation device (80), the heat dissipation to the outside of the refrigeration cycle is hindered, leading to an increase in the high-pressure side pressure of the refrigerator (10). If the high-pressure side pressure of the refrigerator (10) increases, not only will the efficiency (COP) of the refrigeration cycle decrease due to an increase in compression power (power consumption), but the increase in the high-pressure side pressure may also cause the refrigerator (10) to stop. In this regard, according to the configuration [4], the exhaust air from the heat dissipation device (80) is guided to the second position (X2) in the well (3) away from the heat dissipation device (80), so that the temperature of the air around the intake side of the heat dissipation device (80) can be maintained within an appropriate temperature range for the heat dissipation device (80). As a result, a decrease in the efficiency of the refrigeration cycle of the refrigerator (10) due to an increase in the high-pressure side pressure can be suppressed.

[0057] Although several embodiments of the present invention have been described above, it is of course possible to add modifications to the above-described embodiments without departing from the spirit of the present invention.

[0058] In this specification, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement strictly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. Furthermore, in this specification, the expressions "comprise," "include," or "have" a component are not exclusive expressions that exclude the presence of other components. [Explanation of symbols]

[0059] 1: Ground freezing system 3: Pit 5: Ground 10: Freezer 70: Freezing tube 80: Heat dissipation device 100: Exhaust system 110: Duct 130: Fan 140: Exhaust chamber V: Ventilation direction X1 :1st position X2: 2nd position

Claims

1. An exhaust device for a ground freezing system that freezes the ground by supplying a refrigerant cooled by a refrigerator installed in a mine to a freezing pipe in the mine, a duct extending in the tunnel from a first position on the exhaust side of a heat dissipation device installed in the tunnel to dissipate heat from the refrigeration cycle of the refrigerator to an outer system, to a second position farther from the heat dissipation device than the first position; a fan that guides the exhaust air of the heat dissipation device through the duct to the second position inside the tunnel; Equipped with Exhaust system.

2. The duct extends from the first position to the second position toward a downstream side in a ventilation direction of the tunnel.

10. The exhaust system of claim 1.

3. an exhaust chamber provided on the exhaust side of the heat dissipation device; The duct is connected to the exhaust chamber at the first position.

3. The exhaust system according to claim 1 or 2.

4. A freezing pipe that freezes the ground inside the tunnel; a refrigerator installed inside the mine and cooling the refrigerant supplied to the freezing pipe; a heat dissipation device installed inside the tunnel and configured to dissipate heat from the refrigeration cycle of the refrigerator to the outside; The exhaust system according to claim 1 or 2; Equipped with Ground freezing system.

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