Refrigerant circulation device

Abstract

A refrigerant circulation device according to one aspect of an embodiment of the present invention comprises primary piping, secondary piping, a primary filter, a secondary filter, a heat exchanger, a pump, and a housing. A primary refrigerant flows through the primary piping. A secondary refrigerant flows through the secondary piping. The primary filter is connected to the primary piping. The secondary filter is connected to the secondary piping. The heat exchanger exchanges heat between the primary refrigerant and the secondary refrigerant. The pump circulates the secondary refrigerant. The housing houses the primary piping, the secondary piping, the primary filter, the secondary filter, the heat exchanger, and the pump. The primary filter, the secondary filter, the heat exchanger, and the pump are located on the front side in the interior of the housing.

Description

Refrigerant circulation device 【0001】 The disclosed embodiment relates to a refrigerant circulation device. This application claims priority based on Japanese Patent Application No. 2024-218843 filed in Japan on December 13, 2024, and the contents thereof are incorporated herein by reference. 【0002】 There is a refrigerant circulation device including a primary pipe through which a primary refrigerant flows, a secondary pipe through which a secondary refrigerant flows, a primary filter connected to the secondary pipe, a secondary filter connected to the secondary pipe, a pump for circulating the refrigerant, a heat exchanger, and a housing for housing these components (see, for example, Patent Document 1). 【0003】 Specification of Chinese Patent No. 114531822 【0004】 However, in a refrigerant circulation device including a housing, there may be a need for improvement in the maintainability of the components arranged inside the housing. 【0005】 The present invention has been made in view of the above, and an object thereof is to provide a refrigerant circulation device capable of improving maintainability. 【0006】 A refrigerant circulation device according to an aspect of the embodiment includes a primary pipe, a secondary pipe, a primary filter, a secondary filter, a heat exchanger, a pump, and a housing. The primary refrigerant flows through the primary pipe. The secondary refrigerant flows through the secondary pipe. The primary filter is connected to the primary pipe. The secondary filter is connected to the secondary pipe. The heat exchanger performs heat exchange between the primary refrigerant and the secondary refrigerant. The pump circulates the secondary refrigerant. The housing houses the primary pipe, the secondary pipe, the primary filter, the secondary filter, the heat exchanger, and the pump. The primary filter, the secondary filter, the heat exchanger, and the pump are located on the front side inside the housing. 【0007】 A refrigerant circulation device according to an aspect of the embodiment has an effect of being able to improve maintainability. 【0008】Figure 1 is a block diagram showing an example configuration of a refrigerant circulation device according to an embodiment. Figure 2 is a perspective view showing the external appearance of the refrigerant circulation device according to an embodiment. Figure 3 is an explanatory diagram showing the front interior of the refrigerant circulation device according to an embodiment. Figure 4 is an explanatory diagram showing the left side interior of the refrigerant circulation device according to an embodiment. Figure 5 is an enlarged view showing a part of the front interior of the refrigerant circulation device according to an embodiment. 【0009】 The embodiments for implementing the refrigerant circulation device according to this disclosure (hereinafter referred to as "Embodiments") will be described in detail below with reference to the drawings. However, this disclosure is not limited by these embodiments. Furthermore, each embodiment can be combined as appropriate. In the following embodiments, components that perform the same function are denoted by the same reference numerals, and redundant explanations will be omitted. 【0010】 Furthermore, in the embodiments described below, expressions such as "constant," "orthogonal," "perpendicular," or "parallel" may be used, but these expressions do not require strict adherence to "constant," "orthogonal," "perpendicular," or "parallel" conditions. In other words, each of the above expressions allows for deviations, for example, in manufacturing accuracy or installation accuracy. 【0011】 Furthermore, in the drawings referenced below, for the sake of clarity, mutually orthogonal X, Y, and Z axis directions are sometimes defined, and a Cartesian coordinate system is shown with the positive Z axis pointing vertically upward. 【0012】 Figure 1 is a block diagram showing an example configuration of a refrigerant circulation device 2 according to an embodiment. Components labeled with reference numerals containing "P" (P1 to P10) in Figure 1 are pressure sensors. The pressure sensors detect the pressure of the refrigerant. Components labeled with reference numerals containing "T" (T1 to T5) are temperature sensors. The temperature sensors detect the temperature of the refrigerant. 【0013】 Components with the designation "QD" (C1 to C14) are quick-disconnect couplings (hereinafter referred to as "couplings"). Components with the designation "PU" (8, 81) are pumps. Components with the designation "VFD" (D) are variable frequency drivers. 【0014】 The VFD is a control device that controls the operation of the pump. Valves marked with "M" are solenoid valves, while valves without "M" are manual valves. 【0015】 The refrigerant circulation device 2 is a device that circulates primary and secondary refrigerants in order to cool the device to be cooled 102. The device to be cooled 102 is, for example, a heat-generating device such as a CPU (Central Processing Unit). However, the device to be cooled 102 is not limited to a CPU. 【0016】 The refrigerant circulation device 2 includes a primary pipe 3 through which the primary refrigerant flows and a secondary pipe 4 through which the secondary refrigerant flows, both located inside the housing 20. The primary pipe 3 is connected to the cooling tower 101. The cooling tower 101 is a device that cools the primary refrigerant flowing in from the refrigerant circulation device 2 and sends the cooled primary refrigerant back to the refrigerant circulation device 2 for circulation. 【0017】 The secondary piping 4 is connected to the cooling plate 100. The cooling plate 100 is attached to the device to be cooled 102. The refrigerant circulation device 2 delivers secondary refrigerant to the cooling plate 100. Secondary refrigerant that has absorbed heat from the device to be cooled 102 during its passage through the cooling plate 100 flows into the refrigerant circulation device 2. 【0018】 The refrigerant circulation device 2 can be connected to multiple cooling plates 100. Furthermore, the refrigerant circulation device 2 can be connected to multiple cooling target devices 102. Additionally, the refrigerant circulation device 2 can be connected to multiple server racks. 【0019】 In this case, the forward path of the secondary piping 4, which carries the secondary refrigerant from the refrigerant circulation device 2 to the server racks, is distributed to multiple server racks and then further distributed to multiple cooling plates 100. The return path of the secondary piping 4, which carries the secondary refrigerant from the server racks to the refrigerant circulation device 2, is collected from multiple cooling plates 100 and then collected from multiple server racks before being connected to the refrigerant circulation device 2. 【0020】The refrigerant circulation device 2 includes a heat exchanger 5. The heat exchanger 5 is a device that cools the secondary refrigerant by absorbing the heat of the secondary refrigerant flowing in from the cooling plate 100 into the primary refrigerant. The refrigerant circulation device 2 cools the device to be cooled 102 by returning the secondary refrigerant cooled in the heat exchanger 5 to the cooling plate 100. 【0021】 The refrigerant circulation device 2 includes a primary filter 6, a primary flow meter 7, a pump 8, a secondary filter 9, a secondary flow meter 10, an expansion tank 11, and an injection tank 12. A pressure sensor P1 and a temperature sensor T1 are connected to the primary piping 3, which connects the inlet where the primary refrigerant flows in from the cooling tower 101 to the primary filter 6. The pressure sensor P1 is connected to the primary piping 3 via a coupling C1. 【0022】 Furthermore, the primary filter 6 has valve V1 connected to the inlet of the primary refrigerant and valve V2 connected to the outlet of the primary refrigerant. In addition, the primary piping 3 has valve V3 connected to a bypass flow path that bypasses valve V1, the primary filter 6, and valve V2. 【0023】 Furthermore, a pressure sensor P2 is connected to the primary filter 6. In addition, two pipes that connect to the outside of the refrigerant circulation device 2 are connected to the primary filter 6. Valves V4 and V5 are connected to the two pipes. 【0024】 Furthermore, a valve V6 is connected to the primary piping 3 that connects the primary filter 6 and the heat exchanger 5. A coupling C2 for discharging the primary refrigerant to the outside of the refrigerant circulation device 2 is connected to the primary piping 3 that connects the heat exchanger 5 and the primary flow meter 7. 【0025】 A pressure sensor P3, a temperature sensor T2, and a coupling C3 are connected to the primary piping 3, which connects the outlet where the primary refrigerant flows out to the cooling tower 101 to the primary flow meter 7. The pressure sensor P3 is connected to the primary piping 3 via coupling C4. Coupling C3 is a maintenance coupling. 【0026】The primary filter 6 is connected to the primary piping 3 and filters the primary refrigerant flowing through the primary piping 3 to remove foreign matter from the primary refrigerant. If the primary filter 6 becomes clogged or otherwise, the refrigerant pressure detected by the pressure sensor P2 will decrease. 【0027】 Therefore, the refrigerant circulation device 2 can, for example, monitor the pressure downstream of the primary filter 6 using a pressure sensor P2, and when the detected pressure falls below a threshold, it can display a maintenance request notification on the display operation device 19 (see Figure 3), which will be described later. 【0028】 In addition, the refrigerant circulation device 2 may have a pressure sensor P2A located upstream of the primary filter 6 and a pressure sensor P2B located downstream of the primary filter 6. In this case, the refrigerant circulation device 2 will display a maintenance request notification when the pressure difference detected by the two pressure sensors P2A and P2B exceeds a threshold. 【0029】 When cleaning the primary filter 6, first, valves V1 and V2, which are normally open, are closed, and valve V3 is opened. This allows the refrigerant circulation device 2 to continue circulating the primary refrigerant through a bypass flow path that bypasses the primary filter 6, even while the primary filter 6 is being cleaned. Furthermore, when replacing the primary filter 6, the refrigerant circulation device 2 can also continue circulating the primary refrigerant by using this bypass flow path. 【0030】 Afterward, valves V4 and V5, which are normally closed, are opened, and a portion of the refrigerant is allowed to flow from valve V5 to valve V4 to clean the filter. Once cleaning is complete, valves V4 and V5 are closed, valve V3 is closed, and valves V1 and V2 are opened to return to the normal flow path. 【0031】 The primary flow meter 7 detects the flow rate of the primary refrigerant flowing through the primary piping 3. The primary flow meter 7 outputs the detected flow rate of the primary refrigerant to the display and operation device 19. The display and operation device 19 displays information indicating the operating status of the refrigerant circulation device 2, such as the flow rate of the primary refrigerant. 【0032】Pump 8 delivers the secondary refrigerant cooled by the heat exchanger 5 towards the cooling plate 100. In the example shown in Figure 1, three pumps 8 are connected in parallel to the secondary piping 4. Each pump 8 is connected to a variable frequency driver D. 【0033】 The refrigerant circulation device 2 includes a control unit (not shown) that controls the variable frequency driver D. This control unit controls the rotation speed of the pump 8 by the variable frequency driver D, for example, so that the difference between the supply-side pressure of the secondary piping 4 detected by pressure sensors P9 and P10 and the return-side pressure detected by pressure sensors P4 and P5 remains constant, or based on the temperatures detected by temperature sensors T3, T4, and T5. 【0034】 The secondary filter 9 has a valve V10 connected to the inlet of the secondary refrigerant and a valve V11 connected to the outlet of the secondary refrigerant. The secondary piping 4 has a valve V12 connected to a bypass channel that bypasses valve V10, the secondary filter 9, and valve V10. A pressure sensor P8 is also provided near the outlet of the secondary filter 9. As a result, the refrigerant circulation device 2 can continue circulating the secondary refrigerant by using the bypass channel even when the secondary filter 9 is replaced, similar to the primary filter 6. 【0035】 The secondary flow meter 10 is connected to the upstream side of the heat exchanger 5 and detects the flow rate of the secondary refrigerant flowing through the secondary piping 4. The secondary flow meter 10 outputs the detected flow rate of the secondary refrigerant to the display and operation device 19. The display and operation device 19 displays information indicating the operating status of the refrigerant circulation device 2, such as the flow rate of the secondary refrigerant. 【0036】 A coupling C7 for discharging secondary refrigerant to the outside of the refrigerant circulation device 2 is connected to the secondary piping 4 that connects the secondary flow meter 10 and the heat exchanger 5. In addition, a temperature sensor T3 and pressure sensors P4 and P5 are connected to the secondary piping 4 that connects the inlet where secondary refrigerant flows in from the cooling plate 100 to the secondary flow meter 10. Pressure sensors P4 and P5 are connected to the secondary piping 4 via couplings C5 and C6. 【0037】The expansion tank 11 is connected to the secondary piping 4 downstream of the heat exchanger 5. The expansion tank 11 is equipped with a control valve that adjusts the pressure inside the expansion tank 11. The control valve includes a relief valve that releases pressure inside the expansion tank 11 and a diaphragm valve that absorbs pressure fluctuations. The expansion tank 11 adjusts the pressure of the secondary refrigerant flowing through the secondary piping 4 by adjusting the opening of the control valve. 【0038】 The expansion tank 11 is pre-filled with a predetermined pressure. When the refrigerant expands due to heat, the pressure of the secondary refrigerant increases. In this case, the regulating valve located upstream of the expansion tank 11 is opened. 【0039】 At this time, if the pressure of the secondary refrigerant is greater than the sealing pressure of the expansion tank 11, the secondary refrigerant will flow from the secondary piping 4 into the expansion tank 11 until the pressure of the secondary refrigerant becomes equal to the sealing pressure. In this way, the expansion tank 11 can absorb the expansion of the secondary refrigerant, thereby suppressing damage to the secondary piping 4 due to the rise in internal pressure. 【0040】 Furthermore, the expansion tank 11 is positioned downstream of the heat exchanger 5 and upstream of the pump 8. This allows the refrigerant circulation device 2 to adjust the pressure upstream of the pump 8 using the expansion tank 11, even if negative pressure occurs upstream of the pump 8, thereby preventing damage to the pump 8 due to cavitation. 【0041】 Furthermore, in the refrigerant circulation device 2, pressure sensors P9 and P10 and temperature sensors T4 and T5, and coupling C12 are connected to the secondary piping 4 that connects the cooling plate 100 and the secondary filter 9. Pressure sensors P9 and P10 are connected to the secondary piping 4 via couplings C13 and C14. 【0042】 Furthermore, a coupling C12 for discharging secondary refrigerant to the outside of the refrigerant circulation device 2 is connected to the upstream side of the temperature sensor T4. A pressure sensor P7 is connected to the secondary piping 4 that connects the secondary flow meter 10 and the pump 8. Valves V7, V8, and V9 are provided downstream of each pump 8. 【0043】Further, in the refrigerant circulation device 2, a pump 81 and a check valve 13 are provided between the liquid injection tank 12 and the pump 8. The check valve 13 is connected to the secondary pipe 4 via a coupling C10. Further, a pressure sensor P6 is connected to the secondary pipe 4 on the upstream side of the check valve 13 and on the downstream side of the expansion tank 11 via a coupling C9. 【0044】 When the amount of the secondary refrigerant flowing through the secondary pipe 4 decreases, the pump 81 replenishes the secondary refrigerant from the liquid injection tank 12 to the secondary pipe 4 via the check valve 13. Further, the refrigerant circulation device 2 can suppress the refrigerant pumped from the pump 8 from flowing to the liquid injection tank 12 side and looping within the refrigerant circulation device 2 by closing the check valve 13. Note that the refrigerant circulation device 2 may be configured to include a pressurizing tank separately from the liquid injection tank 12 or instead of the liquid injection tank 12. In this case, when the internal pressure of the liquid injection tank 12 decreases, the pump 81 presses the secondary refrigerant into the pressurizing tank to increase the internal pressure. 【0045】 Further, the refrigerant circulation device 2 includes an air bleeding valve 15 connected to the secondary pipe 4 on the downstream side of the pump 8. The exhaust portion of the air bleeding valve 15 is connected to the liquid injection tank 12. That is, the liquid injection tank 12 is fluid-connected to the secondary pipe 4 via the air bleeding valve 15. Thus, the air bleeding valve 15 can discharge the bubbles mixed in the secondary pipe 4 to the outside via the liquid injection tank 12. 【0046】 Further, the refrigerant circulation device 2 includes level sensors 16A and 16B for detecting the amount of the secondary refrigerant in the liquid injection tank 12 and a relief valve 14. When the pressure in the secondary pipe 4 exceeds a threshold value, the refrigerant circulation device 2 causes the relief valve 14 to discharge the secondary refrigerant from the secondary pipe 4 to the liquid injection tank 12. 【0047】 The refrigerant circulation device 2 may be configured to further include a relief valve or a pressure regulating valve on the liquid injection tank 12 side. In this case, when the pressure in the secondary pipe 4 decreases, the refrigerant circulation device 2 discharges the secondary refrigerant from the liquid injection tank 12 to the secondary pipe 4. 【0048】The level sensors 16A and 16B measure the level of the secondary refrigerant in the liquid injection tank 12. The refrigerant circulation device 2 can stop the operation of the pump 8 when the level of the secondary refrigerant is below the threshold value. 【0049】 Further, when the level of the secondary refrigerant in the liquid injection tank 12 falls below the threshold value, the refrigerant circulation device 2 can be notified, for example, by the display operation device 19 to replenish the secondary refrigerant. 【0050】 Next, referring to FIGS. 2 to 5, an arrangement example of the components of the refrigerant circulation device 2 will be described. In the following description, the surface on the positive X-axis side of the refrigerant circulation device 2 is the front, the surface on the negative X-axis side is the back, the surface on the positive Y-axis side is the left side, the surface on the negative Y-axis side is the right side, the surface on the positive Z-axis side is the top surface, and the surface on the negative Z-axis side is the bottom surface. 【0051】 FIG. 2 is a perspective view showing the appearance of the refrigerant circulation device 2 according to the embodiment. FIG. 3 is an explanatory view showing the inside of the front side of the refrigerant circulation device 2 according to the embodiment. FIG. 4 is an explanatory view showing the inside of the side of the refrigerant circulation device 2 according to the embodiment. FIG. 5 is an enlarged view showing a part of the inside of the front side of the refrigerant circulation device 2 according to the embodiment. 【0052】 As shown in FIG. 2, the refrigerant circulation device 2 includes a box-shaped housing 20. The wall surface on the front side of the housing 20 is an openable and closable door. Here, the front side may be, for example, the side facing the passage at the installation location of the refrigerant circulation device 2, the side with many display parts in the refrigerant circulation device 2, or the side with a low piping density in the refrigerant circulation device 2. Further, a through hole 21 penetrating the top plate is provided on the top surface of the housing 20. 【0053】 The primary pipe 3 and the secondary pipe 4 are drawn out from the inside of the housing 20 to the outside through the through hole 21. The through hole 21 may be provided on the bottom surface of the housing 20. In this case, the primary pipe 3 and the secondary pipe 4 are drawn out from the inside of the housing 20 to the outside through the through hole 21 on the bottom surface of the housing 20. 【0054】The housing 20 houses all the components that make up the refrigerant circulation system 2, including the primary piping 3, secondary piping 4, primary filter 6, secondary filter 9, heat exchanger 5, and pump 8. The following describes in detail an example of the arrangement of components inside the housing 20. 【0055】 As shown in Figure 3, the primary filter 6, secondary filter 9, heat exchanger 5, and pump 8 are located on the front side inside the housing 20. Note that the components of the primary filter 6, secondary filter 9, heat exchanger 5, and pump 8 that are accessible to the operator may also be positioned on the front side. Furthermore, the majority of the components of the primary filter 6, secondary filter 9, heat exchanger 5, and pump 8 may be located in the area from the central part in the depth direction of the housing 20 towards the front. Also, the primary filter 6, secondary filter 9, heat exchanger 5, and pump 8 may be inserted and assembled from the front side. This improves accessibility to the primary filter 6, secondary filter 9, heat exchanger 5, and pump 8 of the refrigerant circulation device 2, thereby improving the ease of maintenance by the operator. 【0056】 Furthermore, as shown in Figure 4, the connections between the heat exchanger 5 and the primary and secondary piping 3 and 4, and the connections between the pump 8 and the secondary piping 4, are located inside the housing 20 at locations other than the front. For example, the connections between the heat exchanger 5 and the primary and secondary piping 3 and 4, and the connections between the pump 8 and the secondary piping 4, are located on the rear side of the heat exchanger 5, the underside and rear side of the primary filter 6 or secondary filter 9, or the rear side of the pump 8. This allows the refrigerant circulation device 2 to position the heat exchanger 5 and the pump 8 on the front side for easier maintenance. 【0057】 Furthermore, as shown in Figure 3, the expansion tank 11 and the liquid injection tank 12, which are connected to the secondary piping 4 and store the secondary refrigerant, are located on the front side inside the housing 20. This makes maintenance work on the expansion tank 11 and the liquid injection tank 12 easier, as well as replenishment work on the liquid injection tank 12. 【0058】Furthermore, the expansion tank 11 and the liquid injection tank 12 are located on the top side of the pump 8. As a result, if air bubbles enter the secondary piping 4, the refrigerant circulation device 2 will not allow the air bubbles to flow into the pump 8 but will instead flow into the expansion tank 11 and the liquid injection tank 12 (exhaust them), thereby suppressing the inflow of air bubbles into the pump 8. 【0059】 Furthermore, the primary filter 6 is located on the top side of the expansion tank 11. In this way, the refrigerant circulation device 2 places the primary filter 6, which requires more maintenance than other components, at a relatively high position, allowing workers to perform frequent maintenance on the primary filter 6 in a comfortable posture without having to bend over. If the secondary filter 9 requires more maintenance than the primary filter 6, the positions of the primary filter 6 and the secondary filter 9 may be swapped. This improves the ease of maintenance of the secondary filter 9. 【0060】 Furthermore, as shown in Figures 3 and 4, the heat exchanger 5 is located on the bottom side inside the housing 20. At least one of the pump 8, expansion tank 11 and liquid injection tank 12, primary filter 6, and secondary filter 9 is located on the top side of the housing 20, above the heat exchanger 5. 【0061】 Thus, in the refrigerant circulation system 2, the heavy heat exchanger 5 is positioned at the bottom. On the other hand, components that are easily accessible to the user and require frequent maintenance, such as the pump 8, expansion tank 11 and liquid injection tank 12, primary filter 6, and secondary filter 9, are positioned in the middle section, thereby improving maintainability. 【0062】 Furthermore, as shown in Figure 3, the refrigerant circulation device 2 is further equipped with a display and operation device 19. In one example, the display and operation device 19 is a touch panel display. The display and operation device 19 displays the pressure and temperature status of the primary and secondary refrigerants, the operating status and set values ​​of the pump 8, maintenance requests, and the like. 【0063】 Furthermore, the display and operation device 19 accepts settings and operations for the pump 8. The display and operation device 19 is located on the front side of the housing 20. As a result, the refrigerant circulation device 2 has improved visibility and operability of the display and operation device 19. 【0064】 Furthermore, as shown in Figures 3 and 5, the refrigerant circulation device 2 further comprises a control box 17 and a circuit board box 18. The control box 17 and the circuit board box 18 are located on the top side inside the housing 20. It is most desirable that the control box 17 and the circuit board box 18 be located at the very top inside the housing 20. 【0065】 As a result, the refrigerant circulation device 2 can prevent the electronic equipment in the control box 17 and circuit board box 18 from malfunctioning due to refrigerant leakage from the primary or secondary refrigerant flow path. 【0066】 Furthermore, the circuit board box 18 is equipped with a cover 24 that can be opened and closed from the front. This allows the circuit board box 18 to protect the circuit board 25 inside when the cover 24 is closed. The circuit board 25 is also fixed to the circuit board box 18 by mounting screws. This makes it easy to replace the circuit board 25. 【0067】 As shown in Figure 5, the control box 17 includes an operating unit 22. In one example, the operating unit 22 is a keypad. This operating unit 22 is located on the front side of the housing 20. This allows the refrigerant circulation device 2 to improve the operability of the operating unit 22. 【0068】 Furthermore, the control box 17 is further equipped with connection terminals 23 for connecting the internal control unit to external equipment. These connection terminals 23 are located on the front side of the housing 20. This improves the workability of connecting external equipment to the connection terminals 23 of the refrigerant circulation device 2. 【0069】 Furthermore, in the refrigerant circulation system 2, the liquid injection tank 12 and the expansion tank 11 are arranged in close proximity. This improves the maintainability of the liquid injection tank 12 and the expansion tank 11 in the refrigerant circulation system 2. 【0070】 Furthermore, in the refrigerant circulation device 2, a portion of the primary piping 3 and secondary piping 4 are configured as flow paths extending vertically on the rear side of the housing 20. This ensures that the refrigerant circulation device 2 has working space on the front side. 【0071】Furthermore, this technology can take the following configurations: (1) A refrigerant circulation device comprising: a primary pipe through which a primary refrigerant flows; a secondary pipe through which a secondary refrigerant flows; a primary filter connected to the primary pipe; a secondary filter connected to the secondary pipe; a heat exchanger that performs heat exchange between the primary refrigerant and the secondary refrigerant; a pump that circulates the secondary refrigerant; and a housing that houses the primary pipe, the secondary pipe, the primary filter, the secondary filter, the heat exchanger, and the pump, wherein the primary filter, the secondary filter, the heat exchanger, and the pump are located on the front side inside the housing. (2) The refrigerant circulation device according to (1) above, wherein the connection between the heat exchanger and the primary pipe and the secondary pipe, and the connection between the pump and the secondary pipe are located at locations other than the front side inside the housing. (3) The refrigerant circulation device according to (1) or (2) above, further comprising: a tank connected to the secondary pipe for storing the secondary refrigerant, wherein the housing houses the tank, and the tank is located on the front side inside the housing. (4) The refrigerant circulation device according to (3), wherein the tank is located on the top side of the pump. (5) The refrigerant circulation device according to (4), wherein the primary filter is located on the top side of the tank. (6) The refrigerant circulation device according to any one of (3) to (5), wherein the heat exchanger is located on the bottom side inside the housing, and at least one of the pump, the tank, the primary filter, and the secondary filter is located on the top side of the heat exchanger inside the housing. (7) The refrigerant circulation device according to any one of (1) to (6), further comprising a display operating device, wherein the display operating device is located on the front side of the housing. (8) The refrigerant circulation device according to any one of (1) to (7), further comprising a control box and a circuit board box, wherein the control box and the circuit board box are located on the top side inside the housing. (9) The refrigerant circulation device according to (8), wherein the control box comprises an operating section, wherein the operating section is located on the front side of the housing.(10) The control box further comprises connection terminals for connecting an internal control unit to an external device, wherein the connection terminals are located on the front side of the housing, in the refrigerant circulation device according to (8) or (9). (11) The tank comprises an injection tank for injecting the secondary refrigerant into the secondary piping and an expansion tank for absorbing the thermal expansion of the secondary refrigerant flowing through the secondary piping, wherein the injection tank and the expansion tank are located in close proximity, in the refrigerant circulation device according to any one of (3) to (6). 【0072】 Further effects and modifications can be readily derived by those skilled in the art. Therefore, broader aspects of the present invention are not limited to the specific details and representative embodiments expressed and described above. Accordingly, various modifications are possible without departing from the spirit or scope of the overall concept of the invention as defined by the appended claims and their equivalents. 【0073】 2 Refrigerant circulation system 3 Primary piping 4 Secondary piping 5 Heat exchanger 6 Primary filter 7 Primary flow meter 8 Pump 9 Secondary filter 10 Secondary flow meter 11 Expansion tank 12 Injection tank 13 Check valve 14 Relief valve 17 Control box 18 Circuit board box 19 Display and operation device 20 Housing 21 Through hole 22 Operation section 23 Connection terminal 24 Cover 25 Circuit board 100 Cooling plate 101 Cooling tower 102 Cooling target device

Claims

1. A refrigerant circulation device comprising: a primary pipe through which a primary refrigerant flows; a secondary pipe through which a secondary refrigerant flows; a primary filter connected to the primary pipe; a secondary filter connected to the secondary pipe; a heat exchanger that performs heat exchange between the primary refrigerant and the secondary refrigerant; a pump that circulates the secondary refrigerant; and a housing that houses the primary pipe, the secondary pipe, the primary filter, the secondary filter, the heat exchanger, and the pump, wherein the primary filter, the secondary filter, the heat exchanger, and the pump are located on the front side inside the housing.

2. The refrigerant circulation device according to claim 1, wherein the connection between the heat exchanger and the primary and secondary piping, and the connection between the pump and the secondary piping are located inside the housing at a location other than the front side.

3. The refrigerant circulation device according to claim 1, further comprising a tank connected to the secondary piping for storing the secondary refrigerant, wherein the housing houses the tank, and the tank is located on the front side inside the housing.

4. The refrigerant circulation device according to claim 3, wherein the tank is located on the top side of the pump.

5. The refrigerant circulation device according to claim 4, wherein the primary filter is located on the top side of the tank.

6. The refrigerant circulation device according to claim 3, wherein the heat exchanger is located on the bottom side inside the housing, and at least one of the pump, the tank, the primary filter, and the secondary filter is located on the top side of the heat exchanger inside the housing.

7. The refrigerant circulation device according to claim 1, further comprising a display operating device, wherein the display operating device is located on the front side of the housing.

8. The refrigerant circulation device according to claim 1, further comprising a control box and a circuit board box, wherein the control box and the circuit board box are located on the top side inside the housing.

9. The refrigerant circulation device according to claim 8, wherein the control box comprises an operating unit, and the operating unit is located on the front side of the housing.

10. The refrigerant circulation device according to claim 8, wherein the control box further comprises connection terminals for connecting an internal control unit to an external device, and the connection terminals are located on the front side of the housing.

11. The refrigerant circulation device according to claim 3, wherein the tank includes an injection tank for injecting the secondary refrigerant into the secondary piping and an expansion tank for absorbing the thermal expansion of the secondary refrigerant flowing through the secondary piping, and the injection tank and the expansion tank are arranged in close proximity to each other.

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