Leak detection filling device, refrigeration device, method for filling a leak detection agent and air conditioning device

Abstract

A leak detection agent filling device is a leak detection agent filling device that fills a leak detection agent in a liquid state into the interior of a refrigerant circuit, which has a main circuit through which refrigerant circulates, and the leak detection agent filling device comprises a container in which the leak detection agent is stored, and a connecting aid, which is a tubular aid and has one end section and another end section, wherein one end section is connected to any of a plurality of ports provided on the refrigerant circuit, and the other end section is connected to the container, the connecting aid being configured to direct the leak detection agent in the container into the interior of the refrigerant circuit by means of a vacuum pressure generated when the refrigerant circuit is evacuated.

Description

Technical field

[0001] The present disclosure relates to a leak detection agent filling device which fills a leak detection agent into a refrigerant circuit in order to detect a leakage of refrigerant from the refrigerant circuit, and the present disclosure further relates to a refrigeration generating device, a method for filling a leak detection agent and an air conditioning device. Technical background

[0002] Patent literature 1 discloses, for example, a refrigeration device of this type. The refrigeration device of patent literature 1 comprises a container, a connecting pipe, and a control valve, wherein a leak detection agent is stored in the container, one end of the connecting pipe is connected to the container, the other end of the connecting pipe is connected to a refrigerant line of a refrigerant circuit, and the control valve is provided in the connecting pipe. By opening the control valve, the leak detection agent in the container is filled into the refrigerant circuit via the connecting pipe. Citation list of patent literature

[0003] Patent literature 1: International publication no. WO2018 / 225263 Brief description of the invention: Technical problem

[0004] In the refrigeration device described in patent literature 1, no investigations were carried out regarding the air that can enter when the leak detection fluid is added from the container to the refrigerant circuit, so there is a concern about air ingress. Air ingress into the refrigerant circuit can lead to compressor failure, therefore it is necessary for the refrigeration device to prevent air ingress.

[0005] The present disclosure was made taking this point into consideration and relates to a leak detection agent filling device that can fill a leak detection agent into a refrigerant circuit without air entering, and the present disclosure further relates to a refrigeration generating device, a method for filling a leak detection agent and an air conditioning device. Solution to the problem

[0006] A leak detection agent filling device according to an embodiment of the present disclosure is a leak detection agent filling device that fills a leak detection agent in a liquid state into the interior of a refrigerant circuit, which has a main circuit through which refrigerant circulates, wherein the leak detection agent filling device comprises: a container in which the leak detection agent is stored, and a connecting aid, which is a tubular aid and has one end section and another end section, wherein one end section is connected to any one of a plurality of ports provided on the refrigerant circuit, and the other end section is connected to the container, wherein the connecting aid is configured to force the leak detection agent into the container by means of a vacuum pressure generated when the refrigerant circuit is evacuated.to be directed into the interior of the refrigerant circuit.

[0007] A refrigeration device according to a further embodiment of the present disclosure comprises: the above-mentioned leak detection agent filling device and the refrigerant circuit, which includes the main circuit formed by connecting a compressor, a condenser, a pressure reducing device and an evaporator by means of a refrigerant line.

[0008] A method for filling a leak detection agent according to a further embodiment of the present disclosure is a method for filling a leak detection agent into the above-mentioned refrigeration device, wherein the method comprises: connecting a vacuum pump to a port, different from a port to which the leak detection agent filling device is connected, from the plurality of ports, and performing an evacuation of the refrigerant circuit by the vacuum pump in order to fill the leak detection agent from the leak detection agent filling device into the refrigerant circuit.

[0009] An air conditioning device according to a further embodiment of the present disclosure comprises the above-mentioned refrigeration device, wherein at least one of the condenser and the evaporator is a heat exchanger configured to perform heat exchange between refrigerant and air.

[0010] A refrigeration device according to a further embodiment of the present disclosure comprises: a refrigerant circuit comprising a main circuit formed by connecting a compressor, a condenser, a pressure reducing device and an evaporator by a refrigerant line, wherein refrigerant circulates through the main circuit, and a plurality of connections provided on the refrigerant circuit, wherein the plurality of connections includes a connection to which a vacuum pump is connected when evacuation is carried out, and a connection through which a leak detection agent is introduced into the refrigerant circuit when evacuation is carried out, and wherein the leak detection agent fills the refrigerant circuit. Advantageous effects of the invention

[0011] The leak detection agent filling device according to the embodiment of the present disclosure comprises the container in which the leak detection agent is stored and the connecting device having one end section and the other end section, wherein one end section is connected to any of the plurality of connections provided on the refrigerant circuit, and the other end section is connected to the container. The connecting device directs the leak detection agent in the container into the refrigerant circuit by means of the vacuum pressure generated during evacuation of the refrigerant circuit. Therefore, the leak detection agent filling device according to the embodiment of the present disclosure can fill the leak detection agent into the refrigerant circuit by performing the evacuation and removing air in the process, so that it is possible to fill the leak detection agent into the refrigerant circuit without introducing air. Brief description of the drawings [ Fig. 1] Fig. Figure 1 is a refrigerant circuit diagram of an air conditioning device according to embodiment 1. [ Fig. 2] Fig. Figure 2 is a refrigerant cycle diagram for a case where the air conditioning device according to embodiment 1 is a remote condensing unit. [ Fig. 3] Fig. Figure 3 is a front view of a leak detection agent filling device according to embodiment 1, with part of it shown in cross-section. [ Fig. 4] Fig. Figure 4 is a longitudinal sectional view of a container of the leak detection agent filling device according to embodiment 1. [ Fig. 5] Fig. Figure 5 is a front view of a connecting aid of the leak detection agent filling device according to embodiment 1. [ Fig. 6] Fig. Figure 6 is a diagram illustrating a procedure for filling a leak detection agent into a comparative example. [ Fig. 7] Fig. Figure 7 is a refrigerant circuit diagram of an air conditioning device according to embodiment 2. Description of embodiments

[0012] The following describes a leak detection fluid filling device, a refrigeration unit, and the like, according to various embodiments, with reference to drawings or similar representations. In these embodiments, the description is illustrated by an example where the refrigeration unit is an air conditioning device that provides cooling for a room. In the drawings described below, components marked with the same reference numerals are identical or corresponding components, and this also applies to all embodiments described below. The configurations of constitutional elements described throughout this DESCRIPTION serve only as examples and are not limited to the configurations described in this DESCRIPTION. embodiment 1.[configuration of the air conditioning device 100]

[0013] Fig. Figure 1 is a refrigerant circuit diagram of an air conditioning device 100 according to embodiment 1. The air conditioning device 100 has an outdoor unit 200 and an indoor unit 300, wherein the outdoor unit 200 and the indoor unit 300 are connected to each other via a liquid extension pipe 11 and a gas extension pipe 12.

[0014] The air conditioning device 100 has a refrigerant circuit A. The refrigerant circuit A has a main circuit 10a, an injection circuit 10b and an oil circuit 10c, wherein the injection circuit 10b branches off from the main circuit 10a, and the oil circuit 10c is connected to an oil storage part 1a of a compressor 1 of the main circuit 10a, which will be described later.

[0015] The main circuit 10a comprises at least a compressor 1, a condenser 3, a pressure reducing device 7, and an evaporator 8. In the Fig. In the example shown in Figure 1, the main circuit 10a further comprises an oil separator 2, a liquid reservoir 4, a subcooling heat exchanger 5, a dryer 6, and an accumulator 9. The main circuit 10a is a circuit in which the compressor 1, the oil separator 2, the condenser 3, the liquid reservoir 4, the subcooling heat exchanger 5, the dryer 6, the pressure reducing device 7, the evaporator 8, and the accumulator 9 are interconnected in that order by refrigerant lines 10, including the liquid extension pipe 11 and the gas extension pipe 12, so that refrigerant can circulate through the circuit. In the air conditioning device 100, the compressor 1, the oil separator 2, the condenser 3, the liquid tank 4, the subcooling heat exchanger 5 and the dryer 6 are arranged in the outdoor unit 200, and the pressure reducing device 7 and the evaporator 8 are arranged in the indoor unit 300.

[0016] Compressor 1 draws in refrigerant and then compresses it to a high-temperature and high-pressure state. Oil separator 2 separates the oil contained in the refrigerant from the refrigerant discharged by compressor 1. Condenser 3 is a heat exchanger that performs heat exchange between the refrigerant and air. Condenser 3 cools and condenses the refrigerant discharged by compressor 1. Liquid receiver 4 is a container that stores excess refrigerant liquefied in refrigerant circuit A. Subcooling heat exchanger 5 has a high-pressure side flow channel and a low-pressure side flow channel, with high-pressure refrigerant flowing through the high-pressure side flow channel and low-pressure refrigerant flowing through the low-pressure side flow channel. Subcooling heat exchanger 5 performs heat exchange between the high-pressure and low-pressure refrigerants.The dryer 6 removes foreign substances contained in the refrigerant. These foreign substances include impurities, moisture, and the like. The accumulator 9 stores excess refrigerant. The evaporator 8 is a heat exchanger that performs heat exchange between the refrigerant and air. The evaporator 8 heats and evaporates the refrigerant flowing from the pressure reducing device 7.

[0017] Examples of refrigerants circulating through refrigerant circuit A include a single refrigerant such as R22 or R134a, a near-azeotropic refrigerant mixture such as R410A or R404A, and a non-azeotropic refrigerant mixture such as R407C. The refrigerant circulating through refrigerant circuit A can be a refrigerant with a double bond in its chemical formula and a relatively low global warming potential (GWP), or a mixture of such refrigerants. For example, a refrigerant with a double bond in its chemical formula would be CF3, CF=CH2, or similar. The refrigerant circulating through refrigerant circuit A can also be a natural refrigerant such as CO2 or propane.

[0018] The injection circuit 10b is a circuit that directs refrigerant between the subcooling heat exchanger 5 and the dryer 6 of the main circuit 10a to the suction side of the compressor 1 by bypassing the evaporator 8. The injection circuit 10b includes an injection pipe 5b that branches off from the line between the subcooling heat exchanger 5 and the dryer 6 and is connected to the suction side of the compressor 1 via the low-pressure side flow channel of the subcooling heat exchanger 5. The injection circuit 10b includes a pressure reducing device 5a, which is provided at a position upstream of the low-pressure side flow channel of the subcooling heat exchanger 5 in the injection pipe 5b and is, for example, an expansion valve.

[0019] The oil circuit 10c includes an oil drain pipe 10c1. One end of the oil drain pipe 10c1 is connected to an oil supply / discharge port 1b, and the other end of the oil drain pipe 10c1 is connected to the accumulator 9, with the oil supply / discharge port 1b communicating with the oil storage section 1a, which is provided at the bottom of the compressor 1. The oil supply / discharge port 1b is a penetrating opening provided on the compressor 1's reservoir to discharge oil from the interior of the compressor 1's reservoir or to introduce oil into the reservoir.

[0020] Refrigerant circuit A also has a number of connections. These connections include a suction port 13, an outlet port 14, and a compressor port 15.

[0021] Each of the suction port 13 and outlet port 14 is a connection to which a vacuum pump 18 is connected when performing an evacuation during the installation of the air conditioning unit 100. In the example shown in the drawing, the vacuum pump 18 is connected to the suction port 13. The suction port 13 and the outlet port 14 are also generally referred to as service ports. The suction port 13 and the outlet port 14 are normally closed. Each of the suction port 13 and the outlet port 14 is configured to open when the vacuum pump 18 is connected to the suction port 13 or the outlet port 14 via a hose (not shown in the drawing), a pressure gauge block (not shown in the drawing), or the like.

[0022] In refrigerant circuit A, the suction port 13 is located upstream of the compressor 1 in the direction of refrigerant flow. The suction port 13 is located on the refrigerant line 10, which connects the compressor 1 to the evaporator 8. In the example shown in the drawing, the suction port 13 is located upstream of the accumulator 9. However, it is sufficient if the suction port 13 is located between the compressor 1 and the evaporator 8.

[0023] In refrigerant circuit A, the outlet port 14 is located downstream of the compressor 1 in the direction of refrigerant flow. The outlet port 14 is located on the refrigerant line 10 that connects the compressor 1 to the condenser 3. In the example shown in the drawing, the outlet port 14 is located downstream of the oil separator 2. However, it is sufficient if the outlet port 14 is located between the compressor 1 and the dryer 6.

[0024] Compressor port 15 is a port through which oil stored in the oil reservoir 1a of the compressor 1 is drained. Compressor port 15 is also referred to as the "oil drain plug." Compressor port 15 is provided on the oil drain pipe 10c1. In the same way as suction port 13 and discharge port 14, compressor port 15 is a port to which the vacuum pump 18 is connected when performing an evacuation during the installation of the air conditioning unit 100. Compressor port 15 is normally closed. Compressor port 15 is configured to open when the vacuum pump 18 or a gas cylinder is connected to it via a hose (not shown in the drawing), a pressure gauge block (not shown in the drawing), or the like.In the example shown in the drawing, a leak detection fluid filling device 20 is connected to the compressor connection 15, and the leak detection fluid filling device 20 fills a leak detection fluid into the refrigerant circuit A. The configuration of the leak detection fluid filling device 20 will be described again later.

[0025] Next, the flow of the refrigerant in the main circuit 10a and the injection circuit 10b of the refrigerant circuit A is described.

[0026] After gaseous refrigerant at high temperature and high pressure is discharged from compressor 1, the oil contained in the refrigerant is separated by oil separator 2. The refrigerant then flows into condenser 3. The gaseous refrigerant flowing into condenser 3, at high temperature and high pressure, exchanges heat with the outside air, thereby condensing into liquid refrigerant at high pressure or into a two-phase refrigerant, and is subsequently stored in liquid receiver 4. The refrigerant exiting liquid receiver 4 flows into the high-pressure side flow channel of the subcooling heat exchanger 5 and exchanges heat there with the refrigerant flowing through the low-pressure side flow channel of the subcooling heat exchanger 5 to become supercooled liquid refrigerant at high pressure.

[0027] The high-pressure liquid refrigerant exiting the subcooling heat exchanger 5 flows into the dryer 6, where impurities such as contaminants, moisture, or similar substances are removed. The liquid refrigerant exiting the dryer 6 is then expanded to a low temperature and pressure level by the pressure reducing device 7 in the indoor unit 300, becoming a two-phase refrigerant with low temperature and pressure. It then flows into the evaporator 8. There, the refrigerant exchanges heat with the indoor air and evaporates. At this stage of operation, the indoor air is cooled by the refrigerant, thus cooling the room. The refrigerant evaporated in the evaporator 8 becomes a gaseous refrigerant with low temperature and pressure and returns to the compressor 1 via the accumulator 9.

[0028] A portion of the refrigerant exiting the high-pressure side of the subcooling heat exchanger 5 flows into the injection circuit 10b. The refrigerant entering the injection circuit 10b is expanded by the pressure reducing device 5a and then flows into the low-pressure side flow channel of the subcooling heat exchanger 5. The refrigerant then exchanges heat with the refrigerant flowing through the high-pressure side flow channel of the subcooling heat exchanger 5 and is subsequently injected into the compressor 1.

[0029] The configuration of refrigerant circuit A is not based on the one in Fig. The configuration shown in Figure 1 is limited. For example, refrigerant circuit A may be configured to include a four-way valve or similar device that switches the refrigerant flow channel to change between cooling and heating operation. Refrigerant circuit A may also have a configuration designed exclusively for heating operation. In the case of refrigerant circuit A configured exclusively for heating operation, the heat exchanger installed in the outdoor unit 200 acts as the evaporator, and the heat exchanger installed in the indoor unit 300 acts as the condenser. That is to say, it is sufficient for refrigerant circuit A to have a configuration that includes at least the compressor 1, the condenser 3, the pressure reducing device 5a, and the evaporator 8.

[0030] The air conditioning device 100 is not limited to the air-cooled air conditioning device described above and can be a water-cooled air conditioning device. Therefore, it is sufficient that the air conditioning device 100 has a configuration in which at least one of the condenser 3 and the evaporator 8 is a heat exchanger that performs heat exchange between refrigerant and air.

[0031] In embodiment 1, the air conditioning device 100 has a configuration in which one indoor unit 300 is connected to one outdoor unit 200. However, the configuration is not limited to such a configuration, and a configuration in which any number of indoor units 300 are connected to the one outdoor unit 200 can be used.

[0032] The air conditioning device 100 can also be used in the following Fig. The 2 depicted remote condensation unit is shown.

[0033] Fig. Figure 2 is a refrigerant circuit diagram for a case where the air conditioning device 100 according to embodiment 1 is the remote condensing unit. The remote condensing unit has a configuration in which the refrigerant in the outdoor unit 200 is transferred to the outdoor unit. Fig. 1. The components provided, except for the capacitor 3, are arranged in a compression unit 201, which is located indoors, and the capacitor 3 is provided in an outdoor unit 200A.

[0034] The air conditioning device 100 can also be, for example, an air conditioning device in which the respective equipment and other auxiliary accessories that form the refrigerant circuit A are integrated in a unit as in the case of a cooling system, wherein these components are connected to each other by the refrigerant lines 10.

[0035] In the air conditioning device 100 with the configuration described above, a leak detection agent in a liquid state is introduced into the refrigerant circuit A using the leak detection agent filling device 20. In the air conditioning device 100, the compressor 1, which is the drive source for the refrigerant circuit, is driven so that the leak detection agent circulates through the refrigerant circuit A together with the refrigerant, identifying a section from which the leak detection agent escapes, thus enabling the detection of a refrigerant leak.

[0036] A suitable leak detection agent can be, for example, a fluorescent agent, a dye, an odorant, a foaming agent, or another type of agent. Examples of fluorescent agents include Super Tracer OL-200II or Super Glow. An odorant can be tertiary butyl mercaptan. Examples of foaming agents include Super Bubble TR-1C or Big Blu. It is sufficient for the leak detection agent to be in a liquid state.

[0037] If the leak detection agent is a fluorescent dye, it will glow when irradiated with ultraviolet rays emitted by a UV lamp. Therefore, by irradiating the suspected refrigerant leak site with UV light emitted by the UV lamp, an inspector can easily identify the refrigerant leak point.

[0038] If a dye is used as a leak detection agent, a dyed area can be identified as the source of the refrigerant leak. If an odorant is used as a leak detection agent, the area where an odor is emitted can be identified as the source of the refrigerant leak. If a foaming agent is used as a leak detection agent, the area from which foam emerges can be identified as the source of the refrigerant leak.

[0039] When the air conditioning unit 100 is first installed with the configuration described above, that is, when the air conditioning unit 100 is installed on site, an evacuation is performed in which air is removed from the refrigerant circuit A using the vacuum pump 18, and then a charging operation is carried out to fill the refrigerant circuit A with refrigerant. During this evacuation, a leak detection agent 30a is added to the refrigerant circuit A in the air conditioning unit 100 using the leak detection agent filling device 20. At the time of installation, the air conditioning unit 100 is in a state in which no refrigerant fills the refrigerant circuit A and oil fills the compressor 1.Thus, in the air conditioning device 100 of embodiment 1, evacuation is carried out in a state in which no refrigerant fills the refrigerant circuit A and oil fills the compressor 1. [Configuration of the leak detection fluid filling device 20]

[0040] Fig. Figure 3 is a front view of the leak detection agent filling device 20 according to embodiment 1, with part of it shown in cross-section. Fig. Figure 3 shows the front view of the leak detection fluid filling device 20 in a position in which the leak detection fluid filling device 20 is connected to the compressor connection 15. Fig. Figure 4 is a longitudinal sectional view of a container 30 of the leak detection agent filling device 20 according to embodiment 1. Fig. Figure 5 is a front view of a connecting aid 40 of the leak detection agent filling device 20 according to embodiment 1.

[0041] The leak detection agent filling device 20 comprises the container 30 and the connecting aid 40, wherein the leak detection agent 30a is stored in a liquid state in the container 30, and wherein the connecting aid 40 connects the container 30 to the compressor connection 15. (Container 30)

[0042] As in Fig. As shown in Figure 4, the container 30 is designed in an elongated shape extending in one direction. It should be noted that the container 30 is not limited to an elongated shape. The container 30 has a cylindrical part 31, a connecting section 32, a first cover 33, and a second cover 34.

[0043] The cylindrical part 31 is formed in a long cylindrical shape, both ends of which are open. One end of the cylindrical part 31, in the axial direction, is closed by the connecting section 32 and the first cover 33, and the other end of the cylindrical part 31, in the axial direction, is closed by the second cover 34, thus forming a closed space. The leak detection medium 30a is stored in this closed space.

[0044] The connecting section 32 is a section that is attached to one end of the cylindrical part 31 to form a connection port that is connected to the connecting device 40. A threaded groove provided on the inner circumferential surface of a cylindrical part 32a is screwed into a threaded groove formed on the outer circumferential surface of the cylindrical part 31 near one end of the cylindrical part 31, so that the connecting section 32 is attached to one end of the cylindrical part 31.

[0045] The connecting section 32 comprises the cylindrical part 32a and a projecting part 32b with a columnar shape, wherein the cylindrical part 32a is closed at one end and the projecting part 32b extends outwards from a central section of the closed section of the cylindrical part 32a. The connecting section 32 has an outlet opening 32c through which the leak detection medium 30a flows out in the cylindrical part 31. The outlet opening 32c is a through-hole extending through the closed section of the cylindrical part 32a and the projecting part 32b in the axial direction of the cylindrical part 32a (the up-and-down direction). Fig. 4) through. The outlet opening 32c is designed to extend in the axial direction of the cylindrical part 31. The outlet opening 32c is configured such that a cross-section of the flow channel is narrowed in the axial direction at one point, so that when the container 30 is held in a position in which the outlet opening 32c is located as in Fig. 3 shown on the underside, the leak detection agent 30a in the container 30 only flows out gradually.

[0046] The first cover 33 is formed in a cylindrical shape with one end closed. A threaded groove provided on the inner circumferential surface of the first cover 33 is screwed into a threaded groove formed on the outer circumferential surface of the projecting part 32b of the connecting section 32, so that the first cover 33 is attached to the connecting section 32. The first cover 33 is attached to the connecting section 32 to close the outlet opening 32c formed in the connecting section 32, which is located on the outlet side.

[0047] A threaded groove provided on the inner circumferential surface of the second cover 34 is screwed into a threaded groove formed on the outer circumferential surface of the cylindrical part 31 near the other end of the cylindrical part 31, so that the second cover 34 is attached to the cylindrical part 31. The second cover 34 is attached to the cylindrical part 31 to close the opening of the cylindrical part 31 at the other end of the cylindrical part 31. (Connecting aid 40)

[0048] As described above, the connecting aid 40 connects the container 30 to the compressor connection 15 and directs the leak detection fluid 30a into the interior of the refrigerant circuit A through the vacuum pressure generated during the evacuation of the refrigerant circuit A. The connecting aid 40 is a tubular device and, as described in Fig. 5 shows a pipe section 41, a first nut 42 and a second nut 43.

[0049] The pipe section 41 has one end section 40a and another end section 40b, with one end section 40a being connected to the compressor connection 15 and the other end section 40b being connected to the tank 30. The pipe section 41 is a pipe. The pipe section 41 is L-shaped. In the example shown in the drawing, the pipe section 41 is formed from two pipes, namely a first connecting pipe 41a with a linear shape and a second connecting pipe 41b with an L-shape. However, the pipe section 41 can also be formed from a single pipe.

[0050] In a position where the pipe section 41 is as in Fig. As shown in Figure 3, where the compressor connection 15 is connected, an opening 40a1 of one end section 40a is open laterally, and an opening 40b1 of the other end section 40b is open upwards. In the position where the pipe section 41 is connected as shown in Figure 3, an opening 40b1 of the other end section 40b is open upwards. Fig. When the pipe section 41 is connected to the compressor port 15, it extends first horizontally from one end section 40a and then vertically. One end section 40a of the pipe section 41 has an internal projection 40aa, which presses an adjusting pin (not shown in the drawing) provided in the compressor port 15. The pipe section 41 is configured such that when one end section 40a is connected to the compressor port 15, the projection 40aa presses the adjusting pin to open the compressor port 15, thus connecting the pipe section 41 to the oil circuit 10c. [Installation of the leak detection fluid filling device 20]

[0051] The container 30 is positioned with the first cover 33 on top and the second cover 34 on the bottom, and the first cover 33 is removed in this position. Removing the first cover 33 exposes the connecting section 32. The projecting portion 32b of the connecting section 32 is then engaged with a flared section formed on the other end section 40b of the pipe section 41 of the connecting device 40, and the second nut 43 is tightened. As a result, the threaded groove of the second nut 43 engages with the threaded groove of the connecting section 32, thus fixing the container 30 and the connecting device 40 together, and the assembly of the leak detection filling device 20 is complete. [Connection of the leak detection fluid filling device 20 to the compressor connection 15]

[0052] When connecting the leak detection agent filling device 20 to the compressor connection 15, as described in Fig. Figure 3 shows that one end section 40a of the pipe section 41 is pressed into the compressor port 15. As a result, the projecting part 40aa of the pipe section 41 presses the adjusting pin in the compressor port 15, so that the inside of the pipe section 41 is in contact with the inside of the oil circuit 10c. Subsequently, the first nut 42 is tightened. This action engages a threaded groove provided on the inner circumferential surface of the first nut 42 with a threaded groove provided on the outer circumferential surface of the compressor port 15, so that one end section 40a of the connecting device 40 is connected to the compressor port 15, and the connection of the leak detection fluid filling device 20 to the compressor port 15 is completed.

[0053] In the state where the leak detection fluid filling device 20 is connected to the compressor connection 15, the connecting device 40 holds the container 30 in a vertical position, with the longitudinal direction of the container 30 extending up and down. The pipe section 41 of the connecting device 40 is configured such that the opening 40b1 of the other end section 40b is open upwards. Therefore, the container 30 is brought into a vertical position when the outlet opening 32c is connected to the pipe section 41 so that it is in contact with the opening 40b1. [Filling in the leak detection fluid 30a]

[0054] The leak detection agent 30a is added to the refrigerant circuit A using the leak detection agent filling device 20 simultaneously with the evacuation, which is carried out on site during the installation of the air conditioning device 100. Evacuation is a process in which the interior of the refrigerant circuit A is brought into a vacuum state, first by connecting the vacuum pump 18 to the suction port 13 or the outlet port 14. Fig. In the example shown, the vacuum pump 18 is connected to the suction port 13. However, the vacuum pump 18 can also be connected to the outlet port 14. The leak detection fluid filling device 20 is connected to the compressor port 15, as described above.

[0055] Next, the second cover 34 is removed. The second cover 34 is removed, and the upper end section of the cylindrical part 31 of the container 30 is opened. As a result, the liquid surface of the leak detection fluid 30a in the cylindrical part 31 is exposed to atmospheric pressure. When the vacuum pump 18 is started to initiate evacuation, the vacuum pressure acts on a lower surface 30a2 of the leak detection fluid 30a, and atmospheric pressure acts on a surface 30a1, which is the liquid surface of the leak detection fluid 30a. Consequently, the leak detection fluid 30a flows out of the outlet opening 32c in the container 30 and then flows via the pipe section 41 from the compressor port 15 into the oil circuit 10c of the refrigerant circuit A.

[0056] As described above, the leak detection agent filling device 20 can introduce the leak detection agent 30a from the container 30 into the refrigerant circuit A by means of the vacuum pressure generated during evacuation. Therefore, even if air momentarily enters the refrigerant circuit A at the point where it is connected to the compressor port 15, the leak detection agent filling device 20 can remove the air from the refrigerant circuit A through evacuation. Thus, the leak detection agent filling device 20 can fill the refrigerant circuit A with the leak detection agent 30a without any air entering the refrigerant circuit A. After the evacuation is complete and the filling of the leak detection agent 30a is finished, the leak detection agent filling device 20 and the vacuum pump 18, which are connected to the refrigerant circuit A, are disconnected from the refrigerant circuit A.

[0057] Fig. Figure 6 is a diagram illustrating a method for filling a refrigerant circuit with a leak detection agent. In the comparative example, a refrigerant gas cylinder 402 is connected to the refrigerant circuit via a hose 400, a pressure gauge block 401, or the like. A container 403 is connected to a central section of the hose 400, and a leak detection agent is stored in the container 403. When the opening and closing valve of the refrigerant gas cylinder 402 is opened, the leak detection agent in the container 403 is forced by the refrigerant gas pressure and filled into the refrigerant circuit.

[0058] In this comparative example, the leak detection fluid is forced through by the refrigerant gas pressure. If the connecting section is loose, there is a possibility that the leak detection fluid will be sprayed out.

[0059] In contrast, with the leak detection agent filling device 20, the pressure in the evacuated refrigerant circuit A is lower than the pressure in the container 30. Therefore, even if the connecting section of the leak detection agent filling device 20 is loosely connected to the compressor connection 15, there is no possibility of the leak detection agent 30a being sprayed out, and it is possible to allow the leak detection agent 30a to flow into the refrigerant circuit A.

[0060] As in Fig. As shown in Figure 3, the container 30 of the leak detection fluid filling device 20 is in a vertical position, with its longitudinal axis extending up and down. Because the container 30 is in a vertical position, the leak detection fluid 30a flows out of the outlet opening 32c easily due to its own weight, compared to a case where the container 30 is in a sideways or inclined position. Therefore, the leak detection fluid filling device 20 can allow the leak detection fluid 30a to flow into the oil circuit 10c within a short time through evacuation and by the fluid's own weight, without any residual leak detection fluid 30a remaining in the leak detection fluid filling device 20.

[0061] When the air conditioning unit 100 is installed, an evacuation is first carried out, and then refrigerant is charged into refrigerant circuit A. When compressor 1 is then started, it draws refrigerant into refrigerant circuit A, compresses the refrigerant, and then releases it back into refrigerant circuit A. At this point in the operation, compressor 1 pumps oil stored in oil reservoir 1a upwards to lubricate the interior of compressor 1 and then releases some of the lubricating oil into refrigerant circuit A along with the refrigerant. The oil released into refrigerant circuit A circulates through the circuit in a state of mixture with the refrigerant.

[0062] When compressor 1 is started up, the leak detection fluid 30a, which was filled into the oil circuit 10c via the leak detection fluid filling device 20 during evacuation, initially flows into the oil storage section 1a via the oil supply / discharge port 1b. The leak detection fluid 30a flowing into the oil storage section 1a mixes with the oil in the oil storage section 1a and, as described above, is released into the refrigerant circuit A and circulates through the entire refrigerant circuit A.

[0063] The oil separator 2 is provided on the refrigerant circuit A, and oil is stored in the oil separator 2. The liquid reservoir 4 and the accumulator 9 are also provided on the refrigerant circuit A, and oil, along with excess refrigerant, is stored in the liquid reservoir 4 and the accumulator 9. As described above, the air conditioning device 100 has components that function as an oil tank. Therefore, if the leak detection fluid filling device 20 is located upstream of the oil tank, the leak detection fluid 30a, which flows from the leak detection fluid filling device 20 into the refrigerant circuit A, is initially stored in the oil tank before circulating through the entire refrigerant circuit A. In this case, it takes a certain amount of time until a uniform concentration of the leak detection fluid 30a is reached in the refrigerant circuit A.

[0064] In contrast, in the air conditioning device 100, the leak detection agent filling device 20 is connected to the compressor connection 15, so that the leak detection agent 30a is drawn directly into the compressor 1. Furthermore, as described above, the leak detection agent 30a is discharged from the compressor 1 in a state in which it is mixed with oil. Therefore, the air conditioning device 100 can circulate the leak detection agent 30a through the entire refrigerant circuit A within a short time and achieve a uniform concentration of the leak detection agent 30a in the refrigerant circuit A within a short time.

[0065] The example described above shows the leak detection fluid filling device 20 connected to the compressor port 15. However, the port to which the leak detection fluid filling device 20 is connected is not limited to the compressor port 15. The port to which the leak detection fluid filling device 20 is connected can also be the suction port 13 or the outlet port 14.

[0066] If the leak detection fluid filling device 20 is connected to the suction port 13, it is sufficient in the air conditioning device 100 to connect the vacuum pump 18 to the outlet port 14 or the compressor port 15. In short, in the air conditioning device 100 it is sufficient to connect the leak detection fluid filling device 20 to any of the ports 13 to 15 and to connect the vacuum pump 18 to a different port than the one to which the leak detection fluid filling device 20 is connected.However, in the air conditioning device 100, it is preferable that the leak detection agent filling device 20 is connected to the compressor connection 15 in order to allow the leak detection agent 30a to flow through the entire refrigerant circuit A within a short time. [Beneficial effects of the leak detection agent filling device 20 and the air conditioning device 100]

[0067] As described above, the leak detection agent filling device 20 of embodiment 1 is a device that fills the leak detection agent 30a in a liquid state into the refrigerant circuit A, which has the main circuit 10a through which refrigerant circulates.The leak detection agent filling device 20 comprises the container 30 in which the leak detection agent 30a is stored, and the connecting aid 40, which is a tubular aid and has one end section 40a and the other end section 40b, wherein one end section 40a is connected to any one of a plurality of ports provided on the refrigerant circuit A, and the other end section 40b is connected to the container 30, wherein the connecting aid 40 is configured to direct the leak detection agent 30a in the container 30 into the interior of the refrigerant circuit A by means of a vacuum pressure generated when the refrigerant circuit A is evacuated.

[0068] With the above-mentioned configuration, the leak detection agent filling device 20 can fill the leak detection agent 30a into the refrigerant circuit A, while air is removed by performing the evacuation, so that it is possible to fill the leak detection agent 30a into the refrigerant circuit A without air entering.

[0069] The leak detection agent filling device 20 can fill the leak detection agent 30a into the refrigerant circuit A during an evacuation step, which is a required step performed on-site during installation. Therefore, compared to a case where the leak detection agent 30a is filled at a time other than the evacuation step, it is possible to reduce the time required to carry out the installation work.

[0070] The opening 40b1 of the other end section 40b of the connecting device 40 is open upwards, with the other end section 40b being connected to the container 30. The container 30 is formed in an elongated shape extending in one direction and is connected to the connecting device 40 in a vertical position, the longitudinal direction of the container 30 extending in the up-and-down direction.

[0071] With the configuration described above, the leak detection fluid 30a flows out of the outlet opening 32c in the container 30 and flows in the direction of gravity, subsequently flowing through the opening 40b1 into the connecting aid 40. This means that the leak detection fluid 30a in the container 30 flows out of the outlet opening 32c more easily due to its own weight than if the container 30 were held at an angle or on its side. Therefore, the leak detection fluid filling device 20 can quickly fill the leak detection fluid 30a in the container 30 into the refrigerant circuit A by means of evacuation and the leak detection fluid 30a's own weight, without any leak detection fluid 30a remaining in the leak detection fluid filling device 20.

[0072] The container 30 comprises the cylindrical part 31 and the connecting section 32, wherein the cylindrical part 31 is formed in a cylindrical shape with both ends open in the up-and-down direction, and wherein the connecting section 32 closes the lower end of the cylindrical part 31 and is connected to the other end section 40b of the connecting device 40. The leak detection agent 30a is stored in a space formed by the cylindrical part 31 and the connecting section 32. When an evacuation is carried out, the upper end section of the cylindrical part 31 is opened, exposing the top 30a1 of the leak detection agent 30a.

[0073] With the above-mentioned configuration, during evacuation the vacuum pressure acts on the underside 30a2 of the leak detection medium 30a, and the atmospheric pressure acts on the top side 30a1 of the leak detection medium 30a, so that the leak detection medium filling device 20 can fill the leak detection medium 30a in the container 30 into the refrigerant circuit A.

[0074] The method for filling a leak detection agent of embodiment 1 is a method for filling the leak detection agent 30a in a liquid state into the refrigerant circuit A, which has the main circuit 10a through which refrigerant circulates. In the method for filling a leak detection agent of embodiment 1, one end section 40a of the connecting aid 40, which is a tubular aid, is connected to any of the plurality of connections provided on the refrigerant circuit A, the other end section 40b of the connecting aid 40 is connected to the container 30 in which the leak detection agent 30a is stored, and the leak detection agent 30a in the container 30 is drawn through the connecting aid 40 into the interior of the refrigerant circuit A by the vacuum pressure generated when the refrigerant circuit A is evacuated.

[0075] The above-mentioned procedure for adding a leak detection agent can add the leak detection agent 30a to the refrigerant circuit A, while air is removed by carrying out the evacuation, so that it is possible to add the leak detection agent 30a to the refrigerant circuit A without air entering.

[0076] The method for filling a leak detection agent of embodiment 1 is a method for filling a leak detection agent into the air conditioning device 100, which has the refrigerant circuit A and the leak detection agent filling device 20, wherein the refrigerant circuit A has the main circuit 10a, which is formed by connecting the compressor 1, the condenser 3, the pressure reducing device 7 and the evaporator 8 by the refrigerant line 10.The leak detection agent filling device 20 comprises the container 30 in which the leak detection agent 30a is stored, and the connecting aid 40, which is a tubular aid and has one end section 40a and the other end section 40b, wherein one end section 40a is connected to any of the plurality of connections provided on the refrigerant circuit A, and the other end section 40b is connected to the container 30, wherein the connecting aid 40 is configured to direct the leak detection agent 30a in the container 30 into the interior of the refrigerant circuit A by means of a vacuum pressure generated when the refrigerant circuit A is evacuated.In the method for filling a leak detection agent of embodiment 1, the vacuum pump 18 is connected to a different connection than the one to which the leak detection agent filling device 20 is connected, and the refrigerant circuit A is evacuated by the vacuum pump 18, so that the leak detection agent 30a is filled from the leak detection agent filling device 20 into the refrigerant circuit A.

[0077] The above-mentioned procedure for adding a leak detection agent can add the leak detection agent 30a to the refrigerant circuit A, while air is removed by carrying out the evacuation, so that it is possible to add the leak detection agent 30a to the refrigerant circuit A without air entering.

[0078] As described above, after completion of the evacuation and the filling of the leak detection agent 30a, the leak detection agent filling device 20 and the vacuum pump 18 connected to the refrigerant circuit A are disconnected from the refrigerant circuit A. The air conditioning device 100, from which the leak detection agent filling device 20 and the vacuum pump 18 have been disconnected, has the following configuration: The air conditioning device 100 has the refrigerant circuit A and the plurality of connections 13 to 15, wherein the refrigerant circuit A comprises the main circuit 10a, which is formed by connecting the compressor 1, the condenser 3, the pressure reducing device 7, and the evaporator 8 by means of the refrigerant lines 10, and wherein the plurality of connections 13 to 15 are provided on the refrigerant circuit A.The multiple connections 13 to 15 include the connection to which the vacuum pump 18 is connected when the evacuation is carried out, and the connection through which the leak detection agent is injected into the refrigerant circuit A when the evacuation is carried out, with the leak detection agent 30a filling the refrigerant circuit A.

[0079] With the configuration described above, the air conditioning device 100 has a configuration in which the leak detection agent 30a fills the refrigerant circuit A without air ingress. If the leak detection agent 30a is a fluorescent agent, the air conditioning device 100 has a configuration in which the leak detection agent 30a, when mixed with oil in the refrigerant circuit A, fills the refrigerant circuit A without air ingress. embodiment 2.[configuration of the air conditioning device 100]

[0080] The description was made for the air conditioning device 100 of embodiment 1, which has a configuration in which the leak detection agent 30a is added when the entire refrigerant circuit A is evacuated. A description is given below for an air conditioning device 100 of embodiment 2, which has a configuration in which a closed circuit is formed in the refrigerant circuit A and a leak detection agent 30a is added when the closed circuit is evacuated.

[0081] Fig. Figure 7 is a refrigerant circuit diagram of the air conditioning device 100 according to embodiment 2. In addition to the refrigerant circuit A of embodiment 1, the air conditioning device 100 has, as shown in Fig. Figure 1 shows an opening and closing valve 16 on the upstream side and an opening and closing valve 17 on the downstream side. The opening and closing valve 16 on the upstream side is generally provided as an integral component together with the suction port 13, and the opening and closing valve 17 on the downstream side is generally provided as an integral component together with the outlet port 14. The air conditioning device 100 also has an opening and closing valve 19. Other configurations of the air conditioning device 100 are the same as or identical to the corresponding configurations of embodiment 1.The following mainly describes the configurations that differentiate embodiment 2 from embodiment 1, and configurations not described in embodiment 2 essentially correspond to the corresponding configurations of embodiment 1.

[0082] The upstream open / close valve 16 is a valve that opens and closes a flow channel located between the compressor 1 and the evaporator 8. The upstream open / close valve 16 is provided on the refrigerant line 10 at a position upstream of the suction port 13, with the refrigerant line 10 connecting the compressor 1 to the evaporator 8. The downstream open / close valve 17 is a valve that opens and closes a flow channel located between the compressor 1 and the condenser 3. The downstream open / close valve 17 is provided on the refrigerant line 10 at a position downstream of the outlet port 14, with the refrigerant line 10 connecting the compressor 1 to the condenser 3.The opening and closing valve 19 is provided on the injection pipe 5b at a position upstream of the pressure reducing device 5a. The opening and closing valve 19 is a valve that opens and closes the flow channel of the injection pipe 5b.

[0083] In embodiment 1, the configuration described is that the leak detection agent 30a is added to the refrigerant circuit A during the evacuation process when installing the air conditioning device 100. However, the timing of the addition of the leak detection agent 30a is not limited to the installation of the air conditioning device 100. For example, there may be cases where the leak detection agent 30a is added again if the leak detection agent 30a is a fluorescent agent and a decrease in the degree of fluorescence is detected. In this case, the refrigerant circuit A is already filled with refrigerant.

[0084] When adding the leak detection agent 30a after filling with refrigerant, it is preferable to briefly recover the refrigerant from refrigerant circuit A outside of the circuit to prevent refrigerant from escaping or air from entering the circuit. It is further preferable to add the leak detection agent 30a during the evacuation process, which is carried out before refrigerant is added to refrigerant circuit A, after the refrigerant from the circuit has been recovered outside of it. The refrigerant from the circuit does not necessarily have to be recovered outside of the circuit as described above, but can, for example, also be pumped down into an oil tank such as the liquid reservoir 4.In embodiment 2, the evacuation is carried out in a state in which the refrigerant circuit A, with the exception of a closed circuit 10d, is filled with refrigerant, wherein the refrigerant in the refrigerant circuit A is either recovered outside the refrigerant circuit A or is pumped down to an oil tank, and oil fills the compressor 1.

[0085] The air conditioning device 100 of embodiment 2 has a configuration which is advantageously suited for filling the leak detection agent 30a after filling with refrigerant. [Filling in the leak detection fluid 30a]

[0086] In the air conditioning device 100 of embodiment 2, when the leak detection agent 30a is added after filling with refrigerant, the opening and closing valve 16 on the upstream side, the opening and closing valve 17 on the downstream side, and the opening and closing valve 19 are closed to form the closed circuit 10d, which extends from the opening and closing valve 16 on the upstream side to the opening and closing valve 17 on the downstream side via the compressor 1. Fig. The bold lines in Figure 7 represent the closed circuit 10d. The upstream open / close valve 16, the downstream open / close valve 17, and the open / close valve 19 can be opened or closed automatically in response to a control signal from a controller (not shown in the drawing) provided at the air conditioning device 100, or they can be opened or closed manually. The air conditioning device 100 may have a configuration that does not include the injection circuit 10b. In this case, the open / close valve 19 is not required.In the case of the configuration in which the air conditioning device 100 does not include the injection circuit 10b, when adding the leak detection agent 30a after filling with refrigerant, it is sufficient for the air conditioning device 100 to close the opening and closing valve 16 on the upstream side and the opening and closing valve 17 on the downstream side.

[0087] Subsequently, in the air conditioning device 100, refrigerant is recovered from the closed circuit 10d outside the closed circuit 10d. After the refrigerant has been recovered from the closed circuit 10d, the closed circuit 10d is evacuated in the air conditioning device 100. During the evacuation of the closed circuit 10d in the air conditioning device 100, the leak detection agent 30a is introduced into the closed circuit 10d using the leak detection agent filling device 20 in the same manner as in the embodiment 1 described above.

[0088] More precisely, as in Fig.As shown in Figure 7, the leak detection fluid filling device 20 is connected to the compressor port 15, and the vacuum pump 18 is connected to the suction port 13. The vacuum pump 18 is then started to perform an evacuation, causing the leak detection fluid 30a to flow from the leak detection fluid filling device 20 into the closed circuit 10d. The ports to which the leak detection fluid filling device 20 and the vacuum pump 18 are connected are not limited to the compressor port 15 and the suction port 13 as described above. It is sufficient for the air conditioning device 100 to have a configuration in which the leak detection fluid filling device 20 is connected to any of the ports 13 to 15, and the vacuum pump 18 is connected to a port other than the one to which the leak detection fluid filling device 20 is connected.

[0089] In the air conditioning device 100, after the leak detection agent 30a has been added to the closed circuit 10d, the closed circuit 10d is opened by opening the open / close valve 16 on the upstream side and the open / close valve 17 on the downstream side. Subsequently, when the compressor 1 of the air conditioning device 100 is operated, the leak detection agent 30a can circulate through the entire refrigerant circuit A. [Beneficial effects of the air conditioning device 100]

[0090] As described above, the air conditioning device 100 of embodiment 2 can achieve advantageous effects that essentially correspond to the advantageous effects of embodiment 1, and can furthermore achieve the following advantageous effects, since the opening and closing valve 16 is provided on the upstream side and the opening and closing valve 17 on the downstream side of the refrigerant circuit A.

[0091] In the air conditioning device 100 of embodiment 2, when the leak detection agent 30a is added after filling with refrigerant, the upstream opening and closing valve 16 and the downstream opening and closing valve 17 are closed to form the closed circuit 10d in the refrigerant circuit A. When the closed circuit 10d is evacuated in the air conditioning device 100, the leak detection agent 30a is added from the leak detection agent filling device 20 into the refrigerant circuit A. This allows the air conditioning device 100 to reduce the volume of the evacuation target compared to evacuating the entire refrigerant circuit A, thus enabling the evacuation to be completed quickly. Consequently, the leak detection agent 30a can be added to the refrigerant circuit A within a short time.

[0092] In the embodiments 1 and 2 mentioned above, the description was made under the assumption that the refrigeration unit is an air conditioning unit. However, the refrigeration unit can also be a cooling unit that, for example, cools a refrigerator, a freezer, or the like. Reference symbol list

[0093] 1: Compressor, 1a: Oil storage section, 1b: Oil inlet / outlet port, 2: Oil separator, 3: Condenser, 4: Liquid reservoir, 5: Subcooling heat exchanger, 5a: Pressure reducing device, 5b: Injection tube, 6: Dryer, 7: Pressure reducing device, 8: Evaporator, 9: Accumulator, 10: Refrigerant line, 10a: Main circuit, 10b: Injection circuit, 10c: Oil circuit, 10c1: Oil drain pipe, 10d: Closed circuit, 11: Liquid extension pipe, 12: Gas extension pipe, 13: Suction port, 14: Outlet port, 15: Compressor port, 16: Upstream open / close valve, 17: Downstream open / close valve, 18: Vacuum pump 19: Opening and closing valve, 20: Leak detection fluid filling device, 30: Container, 30a: Leak detection fluid, 30a1: Surface, 30a2: Underside, 31: Cylindrical part, 32: Connecting section, 32a: Cylindrical part, 32b: Projecting part, 32c: Outlet opening, 33: First cover, 34: Second cover40: Connecting device, 40a: one end section, 40a1: opening, 40aa: projection section, 40b: other end section, 40b1: opening, 41: pipe section, 41a: first , Connecting pipe, 41b: second connecting pipe, 42: first nut, 43: second nut, 100: air conditioning unit, 200: outdoor unit, 200A: outdoor unit, 201: compressor unit, 300: indoor unit, 400: hose, 401: pressure gauge block, 402: refrigerant gas cylinder, 403: reservoir, A: refrigerant circuit QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2018 / 225263

[0003]

Claims

[1] Leak detection agent filling device for filling a leak detection agent in a liquid state into the interior of a refrigerant circuit which has a main circuit through which refrigerant circulates, wherein the leak detection agent filling device comprises: a container in which the leak detection agent is stored, and A connecting aid, which is a tubular device and has one end section and another end section, wherein one end section is connected to any of a plurality of ports provided on the refrigerant circuit and the other end section is connected to the vessel, wherein the connecting aid is configured to direct the leak detection agent in the vessel into the interior of the refrigerant circuit by means of a vacuum pressure generated during evacuation of the refrigerant circuit. [2] Leak detection agent filling device according to claim 1, wherein an opening of the other end section of the connecting device is open upwards, wherein the other end section of the connecting device is connected to the container, and the container is formed into a long shape extending in one direction and is connected in a vertical position to the other end section of the connecting aid, with one longitudinal direction of the container extending in an up-and-down direction. [3] Leak detection agent filling device according to claim 1 or claim 2, wherein the container has a cylindrical part formed into a cylindrical shape, with both ends open in an up-and-down direction, and a connecting section configured to close one lower end of the cylindrical part and connected to the other end section of the connecting device, wherein the leak detection agent is stored in a space formed by the cylindrical part and the connecting section, and wherein, when the evacuation is carried out, an upper end section of the cylindrical part is opened so that a liquid surface of the leak detection medium is exposed. [4] Refrigeration equipment comprising: the leak detection agent filling device according to one of claims 1 to 3 and the refrigerant circuit, which includes the main circuit formed by connecting a compressor, a condenser, a pressure reducing device and an evaporator through a refrigerant line. [5] Refrigeration device according to claim 4, wherein the refrigerant circuit includes an oil circuit which has an oil drain pipe connected to an oil supply / oil discharge port of the compressor, the multitude of connections includes a compressor connection provided on the oil drain pipe, and The leak detection fluid filling device is connected to the compressor connection. [6] Refrigeration device according to claim 4, wherein the multiple connections have an outlet connection which is provided on the refrigerant line located between the compressor and the condenser of the main circuit, and The leak detection fluid filling device is connected to the outlet port. [7] Refrigeration device according to claim 4, wherein the multitude of connections includes a suction connection, which is provided on the refrigerant line located between the compressor and the evaporator of the main circuit, and The leak detection fluid filling device is connected to the suction port. [8] Method for filling a leak detection agent into the refrigeration unit according to any one of claims 4 to 7, wherein the method comprises: Connecting a vacuum pump to a port that is different from a port to which the leak detection fluid filling device is connected, from the multitude of ports, and Performing an evacuation of the refrigerant circuit using the vacuum pump in order to fill the leak detection fluid from the leak detection fluid filling device into the refrigerant circuit. [9] Method for filling a leak detection agent according to claim 8, wherein the evacuation is carried out in a state in which no refrigerant fills the refrigerant circuit and oil fills the compressor. [10] Method for filling a leak detection agent according to claim 8, wherein the method comprises: Closing a downstream open / close valve and an upstream open / close valve to form a closed circuit extending from the upstream open / close valve to the downstream open / close valve via the compressor, wherein the downstream open / close valve is configured to open and close a flow channel located between the compressor and the condenser, and the upstream open / close valve is configured to open and close a flow channel located between the compressor and the evaporator, and Performing an evacuation of the closed circuit to fill the leak detection agent from the leak detection agent filling device into the closed circuit. [11] Method for filling a leak detection agent according to claim 10, wherein the evacuation is carried out in a state in which refrigerant fills the refrigerant circuit except for the closed circuit and oil fills the compressor. [12] Air conditioning device comprising the refrigeration unit according to any one of claims 4 to 7, wherein at least one of the condenser and the evaporator is a heat exchanger configured to perform heat exchange between refrigerant and air. [13] Refrigeration equipment comprising: a refrigerant circuit comprising a main circuit formed by connecting a compressor, a condenser, a pressure reducing device and an evaporator by a refrigerant line, with refrigerant circulating through the main circuit, and a variety of connections provided on the refrigerant circuit, whereby The multiple connections include one connection to which a vacuum pump is connected when an evacuation is carried out, and one connection through which a leak detection agent is added to the refrigerant circuit when the evacuation is carried out, and the leak detection fluid fills the refrigerant circuit.

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