Jig device

Abstract

A jig device according to the present invention may comprise: a jig body; a low-pressure connection part provided on the jig body and connected to a low-pressure part of a refrigeration cycle; a high-pressure connection part provided on the jig body and connected to a high-pressure part of the refrigeration cycle; a vacuum connection part provided on the jig body and connected to a vacuum pump; and a vacuum sensor connection part provided on the jig body and connected to a vacuum sensor for detecting a vacuum level inside the jig body.

Description

jig device

[0001] The present invention relates to a jig device for inspecting a refrigeration cycle.

[0002] A refrigeration cycle generally used in refrigerators and the like includes a compressor that compresses a low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, a condenser that changes the high-temperature, high-pressure gaseous refrigerant compressed by the compressor into a high-temperature, high-pressure liquid refrigerant, an expansion valve that expands the high-temperature, high-pressure liquid refrigerant that has passed through the condenser into a low-temperature, low-pressure two-phase refrigerant, and an evaporator that changes the low-temperature, low-pressure two-phase refrigerant that has passed through the expansion valve into a low-temperature, low-pressure gaseous refrigerant. Each of these components is configured to form a closed circuit through a refrigerant pipe.

[0003] The refrigerant circulating along the refrigerant pipe releases heat to the surroundings as it condenses in the condenser and absorbs heat from the surroundings as it evaporates in the evaporator, and the cooling effect is achieved by this evaporator.

[0004] Meanwhile, if a refrigerator needs repair due to a compressor failure or refrigerant leak, the broken compressor can be replaced, or a vacuum pump can be connected to the refrigerant pipe to perform various processes such as product vacuuming, vacuum leak testing, and refrigerant injection.

[0005] However, in the past, there was a problem in that the equipment required for each process for product vacuum, vacuum leak testing, and refrigerant injection had to be installed directly, and when the process was completed, the equipment had to be removed and the equipment required for the next process had to be installed and performed repeatedly.

[0006] Additionally, refrigerant leakage may occur during the process of installing and removing the equipment required for each process, which may result in poor workmanship and reduced product reliability.

[0007] The present invention is proposed to improve the above problems.

[0008] A jig device according to an embodiment of the present invention may include a jig body, a low-pressure connection part provided in the jig body and connected to a low-pressure part of a refrigeration cycle, a high-pressure connection part provided in the jig body and connected to a high-pressure part of the refrigeration cycle, a vacuum connection part provided in the jig body and connected to a vacuum pump, and a vacuum sensor connection part provided in the jig body and connected to a vacuum sensor for detecting a vacuum level inside the jig body.

[0009] The above vacuum connection may be arranged opposite the low pressure connection and the high pressure connection.

[0010] The above vacuum connection part can be positioned opposite the above vacuum sensor connection part.

[0011] The above vacuum sensor connection part can be placed between the low pressure connection part and the high pressure connection part.

[0012] The outer diameter (D1) of the above vacuum connection can be formed to be larger than the outer diameters (D2) of the low pressure connection and the high pressure connection.

[0013] The above vacuum connection part may be provided with a vacuum line for connection to the vacuum pump.

[0014] The above vacuum connection may be provided with a vacuum valve for restricting the flow of fluid through the vacuum line.

[0015] An elastic member may be provided on the outer surface of the above vacuum line.

[0016] The above low pressure connection part may be provided with a low pressure line for connection to the above low pressure part.

[0017] The low pressure connection may be provided with a low pressure valve for restricting the flow of fluid through the low pressure line.

[0018] The high-pressure connection section may be provided with a high-pressure line for connection to the high-pressure section.

[0019] The high pressure connection may be provided with a high pressure valve for restricting the flow of fluid through the high pressure line.

[0020] The above jig device is provided in the jig body and may further include a refrigerant injection unit to which a refrigerant storage unit for injecting refrigerant is connected.

[0021] The above jig device is provided on the jig body and may further include a pressure sensor connection part to which a pressure sensor for detecting the internal pressure of the jig body is connected.

[0022] The above refrigerant injection unit and the pressure sensor connection unit may be positioned opposite each other.

[0023] The above refrigerant injection unit or the pressure sensor connection unit may be provided with an auxiliary vacuum line that is optionally connected to the vacuum pump.

[0024] A path through which fluid flows can be formed inside the above jig body.

[0025] The above-mentioned euro can be connected to the low pressure connection, the high pressure connection, the vacuum connection, and the vacuum sensor connection, respectively.

[0026] The above-mentioned flow path may include a common flow path extending along the longitudinal direction of the jig body and a branch flow path extending from the common flow path in a direction intersecting the longitudinal direction.

[0027] The above branch flow path may include a first branch flow path extending in a first direction from the common flow path and a second branch flow path extending in a second direction opposite to the first direction from the common flow path.

[0028] The above jig body may include a lower body in which a portion of the flow path is formed, and an upper body in which the remaining portion of the flow path is formed and which is coupled to the upper side of the lower body.

[0029] According to the proposed invention, the following effects are achieved.

[0030] First, the various equipment used in the product vacuum, vacuum leak test, and refrigerant injection processes are connected to a single device, so that the product vacuum, vacuum leak test, and refrigerant injection processes can be performed sequentially without the need to separate or connect them for each process, which has the advantage of improving work efficiency and reducing work time.

[0031] Second, since the product vacuum, vacuum leak test, and refrigerant injection processes can be performed continuously, there is an advantage of improved work reliability as there is no refrigerant leakage due to equipment replacement.

[0032] Third, since the vacuum sensor connection part to which the vacuum sensor is connected is positioned at the midpoint between the low pressure connection part and the high pressure connection part, there is an advantage in that the sensing accuracy of the vacuum sensor is improved.

[0033] Fourth, since the vacuum connection to which the vacuum pump is connected is placed opposite the vacuum sensor connection, there is an advantage in that the sensing accuracy of the vacuum sensor is improved.

[0034] Fifth, since the low-pressure and high-pressure sections of the refrigeration cycle can be separated to conduct a vacuum leak test, there is an advantage in being able to accurately detect the location of refrigerant leaks.

[0035] Sixth, since vacuum leak testing can be performed on the high-pressure section of the refrigeration cycle using an auxiliary vacuum line, there is an advantage in that even minute leaks can be accurately detected.

[0036] Seventh, there is an advantage in that pipe cleaning can be easily performed using a jig device.

[0037] Eighth, since the vacuum sensor and pressure sensor are installed together in the jig body, there is an advantage in that the vacuum level and pressure can be easily checked.

[0038] Ninth, the vacuum sensor and pressure sensor are mounted inside the jig body, and the values ​​can be displayed together through an external display, which has the advantage of improving ease of use and making it more compact.

[0039] Figure 1 is a block diagram of a jig device according to an embodiment of the present invention.

[0040] Figure 2 is a plan view of the above jig device.

[0041] Fig. 3 is a perspective view of the above jig device.

[0042] Fig. 4 is a cross-sectional view showing the inside of the jig device.

[0043] Fig. 5 is a cross-sectional view showing the interior of a jig device according to another embodiment of the present invention.

[0044] Figure 6 is a system diagram showing the refrigeration cycle of a refrigerator according to an embodiment of the present invention.

[0045] Figure 7 is a system diagram showing a jig device according to an embodiment of the present invention connected to a refrigeration cycle of a refrigerator.

[0046] FIG. 8 is a drawing showing a jig device according to an embodiment of the present invention connected to a refrigeration cycle of a refrigerator.

[0047] Figure 9 is a flowchart schematically showing a refrigeration cycle inspection method using a jig device according to an embodiment of the present invention.

[0048] Figure 10 is a flowchart showing a product vacuum method using a jig device according to an embodiment of the present invention.

[0049] Fig. 11 is a system diagram showing a product vacuum method using a jig device according to an embodiment of the present invention.

[0050] Fig. 12 is a flowchart showing a vacuum leak inspection method using a jig device according to an embodiment of the present invention.

[0051] FIG. 13 and FIG. 14 are system diagrams showing a vacuum leak inspection method using a jig device according to an embodiment of the present invention.

[0052] Figure 15 is a graph showing the change in vacuum level when a leak occurs in the low pressure section of the refrigeration cycle according to an embodiment of the present invention.

[0053] Fig. 16 is a flowchart showing a high-pressure vacuum leak inspection method using a jig device according to an embodiment of the present invention.

[0054] Fig. 17 is a drawing showing a jig device according to an embodiment of the present invention connected to a refrigeration cycle of a refrigerator.

[0055] Figures 18 and 19 are system diagrams showing a high-pressure vacuum leak inspection method using a jig device according to an embodiment of the present invention.

[0056] Figure 20 is a graph showing the change in vacuum level when a leak occurs in the high pressure section of a refrigeration cycle according to an embodiment of the present invention.

[0057] Fig. 21 is a flowchart showing a pipe cleaning method using a jig device according to an embodiment of the present invention.

[0058] Fig. 22 is a drawing showing a jig device according to an embodiment of the present invention connected to a refrigeration cycle of a refrigerator.

[0059] Figures 23 and 24 are system diagrams showing a pipe cleaning method using a jig device according to an embodiment of the present invention.

[0060] Fig. 25 is a plan view of a jig device according to another embodiment of the present invention.

[0061] Fig. 26 is a cross-sectional view showing the inside of the jig device of Fig. 25.

[0062] Figure 27 is a drawing showing an enlarged view of the display of Figure 25.

[0063] Fig. 28 is a plan view of a jig device according to another embodiment of the present invention.

[0064] Fig. 29 is a cross-sectional view showing the inside of the jig device of Fig. 28.

[0065] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. When designating components in the drawings, it should be noted that, where possible, identical components will be given the same reference numbers even if they appear in different drawings. Furthermore, when describing embodiments of the present invention, if a detailed description of a related known structure or function is deemed to hinder understanding of the embodiments of the present invention, the detailed description will be omitted.

[0066] FIG. 1 is a block diagram of a jig device according to an embodiment of the present invention, FIG. 2 is a plan view of the jig device, FIG. 3 is a perspective view of the jig device, and FIG. 4 is a cross-sectional view showing the inside of the jig device.

[0067] Referring to FIGS. 1 to 4, a jig device (100) according to the present invention is a device for repairing and inspecting a refrigeration cycle used in a refrigerator or air conditioner, etc.

[0068] For example, when a refrigerator needs to be repaired due to a compressor failure or refrigerant leak, the jig device (100) can perform various processes such as product vacuuming, vacuum leak testing, and refrigerant injection by connecting a vacuum pump.

[0069] In the past, there was an inconvenience in that the equipment required for each process for product vacuum, vacuum leak testing, and refrigerant injection had to be installed directly using a jig, and when the process was completed, the equipment had to be removed and the equipment required for the next process had to be installed and performed repeatedly.

[0070] However, according to the present invention, various equipment used in multiple processes can be connected to a single device, so that product vacuum, vacuum leak inspection, and refrigerant injection processes can be sequentially performed without the need to separate or connect them for each process, thereby improving work efficiency and reducing work time.

[0071] The above jig device (100) includes a jig body (110).

[0072] The above jig body (110) connects the product's refrigeration cycle and the vacuum pump (200) to enable product vacuum, vacuum leak inspection, and refrigerant injection processes.

[0073] By driving the vacuum pump (200), vacuum pressure can be applied to the jig body (110). A flow path through which a fluid flows is formed in the jig body (110).

[0074] The above jig body (110) may have a three-dimensional shape in which the height in the vertical direction is smaller than the width in the front-back direction. The above jig body (110) may be formed such that the length in the left-right direction is greater than the height in the vertical direction.

[0075] Define the direction.

[0076] Based on Fig. 3, the surface where the vacuum connection part (140) is placed is defined as the “front surface”, and the surface where the refrigerant injection part (170) is placed is defined as the “left surface.”

[0077] The side opposite the front side where the vacuum connection part (140) is placed is defined as the “rear side”, and the side opposite the left side where the refrigerant injection part (170) is placed is defined as the “right side”.

[0078] The direction from the rear of the jig body (110) toward the front is defined as “front”. Conversely, the direction from the front of the jig body (110) toward the rear is defined as “rear”.

[0079] The above forward and backward directions can be defined as “forward and backward direction” or “first direction”.

[0080] With reference to Fig. 3, the jig body (110) may have a vertical height. The vertical direction may be understood as a direction perpendicular to the ground. The vertical direction may be defined as a "second direction."

[0081] Based on Fig. 3, the jig body (110) may have a length in both directions. The two-way direction or the left-right direction may be defined as a “third direction.”

[0082] According to one embodiment, the jig body (110) may have a hexahedral shape.

[0083] In detail, the jig body (110) may include a front portion (111), a rear portion (112), a first side portion (113), a second side portion (114), an upper portion (115), and a lower portion (116).

[0084] The front portion (111) forms the front exterior of the jig body (110). The front portion (111) may be formed in a flat shape.

[0085] The rear portion (112) forms the rear exterior of the jig body (110). The rear portion (112) may be formed in a flat shape.

[0086] The front part (111) and the rear part (112) may be arranged to face each other. The front part (111) and the rear part (112) may be formed to have the same size.

[0087] The first side portion (113) connects one side of the front portion (111) and the rear portion (112), and forms one side of the jig body (110). The first side portion (113) can form the left side appearance of the jig body (110). The first side portion (113) can be formed in a flat shape.

[0088] The second side portion (114) connects the other side of the front portion (111) and the rear portion (112), and forms the other side of the jig body (110). The second side portion (114) can form the right side appearance of the jig body (110). The second side portion (114) can be formed in a flat shape.

[0089] The first side portion (113) and the second side portion (114) may be arranged to face each other. The first side portion (113) and the second side portion (114) may be formed to have the same size.

[0090] The upper surface (115) connects the upper sides of the front surface (111) and the rear surface (112), and forms the upper surface of the jig body (110). The upper surface (115) may be formed as a plane.

[0091] The lower surface (116) connects the lower sides of the front surface (111) and the rear surface (112), and forms the lower surface of the jig body (110). The lower surface (116) may be formed in a flat shape.

[0092] The upper surface (115) and the lower surface (116) may be arranged to face each other. The upper surface (115) and the lower surface (116) may be formed to have the same size.

[0093] A fluid path (117) is formed inside the above jig body (110).

[0094] Here, the fluid may include air, gas, refrigerant, oil, etc.

[0095] The above-mentioned flow path (117) may be formed by penetrating or cutting a portion of the jig body (110). The flow path (117) may be connected to a plurality of ports. A single flow path (117) connected to all of the plurality of ports may be formed inside the jig body (110).

[0096] The above euro (117) may include a plurality of narrow euros.

[0097] For example, the above-mentioned euro (117) may be formed in the shape of a path or manifold.

[0098] According to one embodiment, the euro (117) may include a common euro (117a) and a branch euro branched from the common euro (117a).

[0099] The common flow path (117a) extends along the longitudinal direction of the jig body (110), and the branch flow path may extend in a direction intersecting the longitudinal direction. The branch flow path may extend in a direction orthogonal to the longitudinal direction.

[0100] For example, the common flow path (117a) may extend in the left-right direction inside the jig body (110), and the branch flow path may extend in the front-back direction inside the jig body (110).

[0101] The common flow path (117a) may extend in the left and right directions from the inner center of the jig body (110). One side of the common flow path (117a) may extend to the first side portion (113) of the jig body (110). The other side of the common flow path (117a) may extend to the second side portion (114) of the jig body (110). The common flow path (117a) may connect the first side portion (113) and the second side portion (114) of the jig body (110).

[0102] Accordingly, the fluid can flow into the interior of the jig body (110) through the first side portion (113) or the second side portion (114) of the jig body (110). For example, the common flow path (117a) can be formed in a straight line.

[0103] The above branch flow path can branch forward or backward from the above common flow path (117a).

[0104] The above branch flow path may include a first branch flow path (117b) extending forward from the above common flow path (117a).

[0105] The first branch flow path (117b) may extend forward from the center of the common flow path (117a). The first branch flow path (117b) may extend to the front part (111) of the jig body (110).

[0106] Accordingly, fluid can flow into the interior of the jig body (110) through the front part (111) of the jig body (110). For example, the first branch flow path (117b) can be formed in a straight line.

[0107] The above branch flow path may include a second branch flow path (117c) extending rearward from the above common flow path (117a).

[0108] The second branch flow path (117c) may extend rearward from the common flow path (117a). The second branch flow path (117c) may extend to the rear portion (112) of the jig body (110).

[0109] Accordingly, fluid can flow into the interior of the jig body (110) through the rear portion (112) of the jig body (110). For example, the second branch flow path (117c) can be formed in a straight shape.

[0110] The above second branch flow path (117c) may be formed in multiple pieces. A plurality of second branch flow paths (117c) may be connected to the common flow path (117a).

[0111] The above-described plurality of second branch channels (117c) may be spaced apart at regular intervals along the length direction of the above-described common channel (117a). For example, the above-described plurality of second branch channels (117c) may be composed of three.

[0112] The width (W1) of the common flow path (117a) and the width (W3) of the second branch flow path (117c) may be formed to be the same. However, the width (W2) of the first branch flow path (117b) may be formed to be larger than the width (W1) of the common flow path (117a) or the width (W3) of the second branch flow path (117c).

[0113] Specifically, a vacuum line (210) connected to a vacuum pump (200) may be connected to the first branch flow path (117b). Accordingly, since a relatively large vacuum pressure is applied to the first branch flow path (117b), in order to evenly distribute the vacuum pressure applied to the inside of the jig body (110), the width (W2) of the first branch flow path (117b) may be formed to be larger than the widths (W1, W3) of the other flow paths.

[0114] The above jig body (110) may be formed of a metal material. For example, the above jig body (110) may be composed of two parts that can be joined together.

[0115] According to one embodiment, the jig body (110) may include a lower body (118) and an upper body (119) coupled to the lower body (111).

[0116] The lower body (118) forms the lower part of the jig body (110) and can be supported on the ground. The upper body (119) forms the upper part of the jig body (110) and can be coupled to the upper side of the lower body (118).

[0117] The lower body (118) and the upper body (119) may be formed in the same shape and then combined. Alternatively, the lower body (118) and the upper body (119) may be formed in corresponding shapes and then combined.

[0118] In order to form the above-mentioned flow path (117), a part of the flow path (117) may be formed in the lower body (118), and the remaining part of the flow path (117) may be formed in the upper body (119).

[0119] For example, the lower part of the flow path (117) is formed inside the lower body (118), the upper part of the flow path (117) is formed inside the upper body (119), and the lower body (118) and the upper body (119) can be combined to form the flow path (117).

[0120] In order to prevent air leakage of the above-mentioned passage (117), the lower body (118) and the upper body (119) may be fixed by welding or laser fusion, etc. However, the present invention is not limited thereto, and the lower body (118) and the upper body (119) may be joined in various ways.

[0121] The above jig device (100) may include a vacuum connection (120).

[0122] The above vacuum connection part (120) is a part for connecting the jig body (110) and the vacuum pump (200). The vacuum connection part (120) may be provided on the jig body (110). The vacuum connection part (120) may be formed in a shape that protrudes or extends from the outer surface of the jig body (110). The vacuum connection part (120) may be connected to the first branch flow path (117b).

[0123] The vacuum connection part (120) may be provided on the front part (111) of the jig body (110). For example, the vacuum connection part (120) may be inserted into the interior of the jig body (110). When a part of the vacuum connection part (120) is inserted into the interior of the jig body (110), the interior of the vacuum connection part (120) and the first branch flow path (117b) may be connected.

[0124] The above vacuum connection part (120) may be formed in a tube or nipple shape. The above vacuum connection part (120) may be formed of the same metal material as the jig body (110).

[0125] The outer diameter (D1) of the above vacuum connection (120) can be formed smaller than the width (W2) of the first branch flow path (117b).

[0126] In order to prevent air leakage between the first branch flow path (117b) and the vacuum connection part (120), a sealing member (121) may be provided between the first branch flow path (117b) and the vacuum connection part (120).

[0127] The sealing member (121) may be provided on the outer surface of the vacuum connection portion (120) or on the inner surface of the first branch flow path (117b). For example, the sealing member (121) may be fixed to the inside of the jig body (110) by being pressed or fused.

[0128] By means of the sealing member (121), the vacuum connection part (120) can be firmly fixed to the inside of the jig body (110). In addition, air can be prevented from leaking through the gap of the first branch flow path (117b).

[0129] A vacuum line (210) extending from the vacuum pump (200) can be connected to the vacuum connection (120). The vacuum line (210) can be detachably connected to the vacuum connection (120).

[0130] The above vacuum connection (120) may be equipped with a vacuum valve (125) that restricts the flow of fluid. The vacuum valve (125) may be operated to open or close, thereby allowing or blocking the flow of fluid flowing through the vacuum connection (120).

[0131] The above vacuum pump (200) functions to apply vacuum pressure to the refrigeration cycle of the product, thereby forming a vacuum state inside the refrigeration cycle.

[0132] The above vacuum pump (200) can be driven by being connected to the vacuum connection part (120).

[0133] When the above vacuum pump (200) is driven, vacuum pressure is applied to the inside of the jig body (110), and thus the vacuum operation of the refrigeration cycle can be performed.

[0134] Here, vacuum operation refers to removing non-condensable gases and moisture within the refrigeration cycle to create a vacuum state. The vacuum level is based on a vacuum level of 0.5 Torr or less, and since it is not verified by vacuum time, it must be verified using a vacuum sensor.

[0135] Here, a lower vacuum level means that it is closer to a vacuum state, and a higher vacuum level means that it is a state where a vacuum cannot be achieved.

[0136] The vacuum operation of the refrigeration cycle can be called "product vacuum".

[0137] The above jig device (100) may include a low pressure connection (130).

[0138] The low-pressure connection part (130) is a part for connecting the jig body (110) and the low-pressure part of the refrigeration cycle. The low-pressure connection part (130) may be provided on the jig body (110). The low-pressure connection part (130) may be formed in a shape that protrudes or extends from the outer surface of the jig body (110). The low-pressure connection part (130) may be connected to the second branch flow path (117c).

[0139] The low-pressure connection part (130) may be provided on the rear surface (112) of the jig body (110). For example, the low-pressure connection part (130) may be inserted into the interior of the jig body (110). When a portion of the low-pressure connection part (130) is inserted into the interior of the jig body (110), the interior of the low-pressure connection part (130) and the second branch flow path (117c) may be connected.

[0140] The low-pressure connection part (130) may be formed in a pipe or nipple shape. The low-pressure connection part (130) may be formed of the same metal material as the jig body (110).

[0141] The outer diameter (D2) of the above low-pressure connection (130) can be formed smaller than the width (W3) of the second branch flow path (117c).

[0142] In order to prevent air leakage between the second branch flow path (117c) and the low pressure connection part (130), a sealing member (131) may be provided between the second branch flow path (117c) and the low pressure connection part (130).

[0143] The sealing member (131) may be provided on the outer surface of the low-pressure connecting portion (130) or on the inner surface of the second branch flow path (117c). For example, the sealing member (131) may be fixed to the inside of the jig body (110) by being pressed or fused.

[0144] By means of the sealing member (131), the low-pressure connection part (130) can be strongly fixed to the inside of the jig body (110). In addition, fluid leakage through the gap of the second branch flow path (117c) can be prevented.

[0145] The above low pressure connection (130) may be provided with a low pressure line (137).

[0146] The low pressure line (137) may be detachably connected to the low pressure connection portion (130). The low pressure line (137) may be understood as a configuration that connects the low pressure connection portion (130) and the low pressure portion of the refrigeration cycle. The low pressure line (137) may be formed in a pipe or tube shape.

[0147] At one end of the low pressure line (137), a first connection portion (137a) for connection to the low pressure connection portion (130) may be provided.

[0148] At the other end of the low pressure line (137), a second connection (137b) for connection to the refrigeration cycle may be provided.

[0149] The low pressure connection (130) may be provided with a low pressure valve (135) that restricts the flow of fluid. The low pressure valve (135) may be operated to open or close, thereby allowing or blocking the flow of fluid flowing through the low pressure connection (130).

[0150] The above jig device (100) may include a high pressure connection (140).

[0151] The high-pressure connection part (140) is a part for connecting the jig body (110) and the high-pressure part of the refrigeration cycle. The high-pressure connection part (140) may be provided on the jig body (110). The high-pressure connection part (140) may be formed in a shape that protrudes or extends from the outer surface of the jig body (110). The high-pressure connection part (140) may be connected to the second branch flow path (117c).

[0152] The high-pressure connection part (140) may be provided on the rear surface (112) of the jig body (110). For example, the high-pressure connection part (140) may be inserted into the interior of the jig body (110). When a portion of the high-pressure connection part (140) is inserted into the interior of the jig body (110), the interior of the high-pressure connection part (140) and the second branch flow path (117c) may be connected.

[0153] The high-pressure connection part (140) may be formed in a pipe or nipple shape. The high-pressure connection part (140) may be formed of the same metal material as the jig body (110).

[0154] The outer diameter (D2) of the high-pressure connection portion (140) may be formed smaller than the width (W3) of the second branch flow path (117c).

[0155] In order to prevent air leakage between the second branch flow path (117c) and the high-pressure connection part (140), a sealing member (141) may be provided between the second branch flow path (117c) and the high-pressure connection part (140).

[0156] The sealing member (141) may be provided on the outer surface of the high-pressure connection portion (140) or on the inner surface of the second branch flow path (117c). For example, the sealing member (141) may be fixed to the inside of the jig body (110) by being pressed or fused.

[0157] By means of the sealing member (141), the high-pressure connection part (140) can be firmly fixed to the inside of the jig body (110). In addition, fluid leakage through the gap of the second branch flow path (117c) can be prevented.

[0158] The high pressure connection part (140) may be equipped with a high pressure line (147).

[0159] The high-pressure line (147) can be detachably connected to the high-pressure connection unit (140). The high-pressure line (147) can be understood as a configuration that connects the high-pressure connection unit (140) and the high-pressure section of the refrigeration cycle. The high-pressure line (147) can be formed in a pipe or tube shape.

[0160] At one end of the high-pressure line (147), a first connection portion (147a) for connection to the high-pressure connection portion (140) may be provided.

[0161] At the other end of the high pressure line (147), a second connection (147b) for connection to the refrigeration cycle may be provided.

[0162] The high pressure connection (140) may be provided with a high pressure valve (145) that restricts the flow of fluid. The high pressure valve (145) may be operated to open or close, thereby allowing or blocking the flow of fluid flowing through the high pressure connection (140).

[0163] The above jig device (100) may include a vacuum sensor connection part (150).

[0164] The above vacuum sensor connection part (150) is a part for connecting the jig body (110) and the vacuum sensor (300).

[0165] The vacuum sensor connection part (150) may be provided on the jig body (110). The vacuum sensor connection part (150) may be formed in a shape that protrudes or extends from the outer surface of the jig body (110). The vacuum sensor connection part (150) may be connected to the second branch flow path (117c).

[0166] The vacuum sensor connection part (150) may be provided on the rear surface (112) of the jig body (110). The vacuum sensor connection part (150) may be positioned to face the vacuum connection part (120). For example, the vacuum sensor connection part (150) may be inserted into the interior of the jig body (110). When a part of the vacuum sensor connection part (150) is inserted into the interior of the jig body (110), the interior of the vacuum sensor connection part (150) and the second branch flow path (117c) may be connected.

[0167] The vacuum sensor connection part (150) may be formed in a tube or nipple shape. The vacuum sensor connection part (150) may be formed of the same metal material as the jig body (110).

[0168] The outer diameter (D2) of the above vacuum sensor connection part (150) can be formed smaller than the width (W3) of the second branch flow path (117c).

[0169] In order to prevent air leakage between the second branch flow path (117c) and the vacuum sensor connection part (150), a sealing member (151) may be provided between the second branch flow path (117c) and the vacuum sensor connection part (150).

[0170] The sealing member (151) may be provided on the outer surface of the vacuum sensor connection portion (150) or on the inner surface of the second branch flow path (117c). For example, the sealing member (151) may be fixed to the inside of the jig body (110) by being pressed or fused.

[0171] By means of the sealing member (151), the vacuum sensor connection part (150) can be firmly fixed to the inside of the jig body (110). In addition, fluid leakage through the gap of the second branch flow path (117c) can be prevented.

[0172] The vacuum sensor (300) can detect the vacuum state inside the jig body (110). The vacuum sensor (300) is connected to the vacuum sensor connection part (150) and can measure the vacuum level inside the jig body (110).

[0173] The above vacuum sensor (300) may include a display that displays the vacuum pressure inside the jig body (110). The display may display the vacuum level measured by the vacuum sensor (300).

[0174] For example, the vacuum sensor (300) can measure the vacuum level using the thermal conductivity of a fluid passing through a heating wire. The vacuum sensor (300) may include a Pirani gauge or a thermocouple gauge.

[0175] However, it is not limited thereto, and the vacuum sensor (300) can measure the vacuum level inside the jig body (110) using various operating principles.

[0176] Meanwhile, the vacuum sensor connection part (150) can be placed between the low pressure connection part (130) and the high pressure connection part (140).

[0177] Specifically, the vacuum sensor connection part (150) can be placed at a midpoint between the low pressure connection part (130) and the high pressure connection part (140).

[0178] If the vacuum sensor connection part (150) is positioned adjacent to the low pressure connection part (130) or the high pressure connection part (140), accurate sensing of the vacuum sensor (300) may be difficult due to the vacuum pressure applied to the low pressure connection part (130) or the high pressure connection part (140).

[0179] Therefore, in this embodiment, by arranging the vacuum sensor connection part (150) at a midpoint between the low pressure connection part (130) and the high pressure connection part (140), the sensing accuracy of the vacuum sensor (300) can be improved.

[0180] The above jig device (100) may include a pressure sensor connection part (160).

[0181] The above pressure sensor connection part (160) is a part for connecting the jig body (110) and the pressure sensor (400).

[0182] The pressure sensor connection part (160) may be provided on the jig body (110). The pressure sensor connection part (160) may be formed in a shape that protrudes or extends from the outer surface of the jig body (110). The pressure sensor connection part (160) may be connected to the common flow path (117a).

[0183] The pressure sensor connection part (160) may be provided on the second side part (114) of the jig body (110). For example, the pressure sensor connection part (160) may be inserted into the interior of the jig body (110). When a part of the pressure sensor connection part (160) is inserted into the interior of the jig body (110), the interior of the pressure sensor connection part (160) and the common flow path (117a) may be connected.

[0184] The pressure sensor connection part (160) may be formed in a tube or nipple shape. The pressure sensor connection part (160) may be formed of the same metal material as the jig body (110).

[0185] The outer diameter (D3) of the pressure sensor connection portion (160) may be formed smaller than the width (W1) of the common flow path (117a).

[0186] In order to prevent air leakage between the common flow path (117a) and the pressure sensor connection part (160), a sealing member (161) may be provided between the common flow path (117a) and the pressure sensor connection part (160).

[0187] The sealing member (161) may be provided on the outer surface of the pressure sensor connection portion (160) or on the inner surface of the common flow path (117a). For example, the sealing member (161) may be fixed to the inside of the jig body (110) by being pressed or fused.

[0188] By means of the sealing member (161), the pressure sensor connection part (160) can be firmly fixed to the inside of the jig body (110). In addition, fluid leakage through the gap of the common flow path (117a) can be prevented.

[0189] The pressure sensor (400) can detect the pressure inside the jig body (110). The pressure sensor (400) is connected to the pressure sensor connection part (160) and can measure the pressure of the fluid flowing inside the jig body (110).

[0190] The pressure sensor (400) may include a display that displays the pressure inside the jig body (110). The display may display a pressure value measured by the pressure sensor (400).

[0191] For example, the pressure sensor (400) can detect the pressure of a closed space by using the flow rate or velocity of the inflowing fluid. The pressure sensor (400) may include an air pressure sensor or a differential pressure sensor.

[0192] However, it is not limited thereto, and the pressure sensor (400) can measure the pressure inside the jig body (110) using various operating principles.

[0193] The above jig device (100) may include a refrigerant injection unit (170).

[0194] The above refrigerant injection part (170) is a part for connecting the jig body (110) and the refrigerant storage part (500). The refrigerant of the refrigerant storage part (500) can be injected into the refrigeration cycle side through the refrigerant injection part (170).

[0195] The above refrigerant injection part (170) may be provided in the jig body (110). The refrigerant injection part (170) may be formed in a shape that protrudes or extends from the outer surface of the jig body (110). The refrigerant injection part (170) may be connected to the common flow path (117a).

[0196] The above refrigerant injection part (170) may be arranged to face the pressure sensor connection part (160). For example, the central axis of the refrigerant injection part (170) and the central axis of the pressure sensor connection part (160) may be arranged on the same line.

[0197] The above refrigerant injection part (170) may be provided on the first side portion (113) of the jig body (110). For example, the refrigerant injection part (170) may be inserted into the interior of the jig body (110). When a portion of the refrigerant injection part (170) is inserted into the interior of the jig body (110), the interior of the refrigerant injection part (170) and the common flow path (117a) may be connected.

[0198] The above refrigerant injection part (170) may be formed in a pipe or nipple shape. The above refrigerant injection part (170) may be formed of the same metal material as the jig body (110).

[0199] The outer diameter (D3) of the above refrigerant injection portion (170) can be formed smaller than the width (W1) of the common flow path (117a).

[0200] In order to prevent air leakage between the common flow path (117a) and the refrigerant injection part (170), a sealing member (171) may be provided between the common flow path (117a) and the refrigerant injection part (170).

[0201] The sealing member (171) may be provided on the outer circumferential surface of the refrigerant injection portion (170) or on the inner circumferential surface of the common flow path (117a). For example, the sealing member (171) may be fixed to the inside of the jig body (110) by being pressed or fused.

[0202] By means of the sealing member (171), the refrigerant injection part (170) can be firmly fixed to the inside of the jig body (110). In addition, fluid leakage through the gap of the common flow path (117a) can be prevented.

[0203] The above refrigerant storage unit (500) functions to store refrigerant to be injected into the refrigeration cycle. The refrigerant storage unit (500) is connected to the refrigerant injection unit (170) to provide refrigerant to the refrigeration cycle through the jig body (110).

[0204] Meanwhile, a detergent storage unit may be optionally connected to the refrigerant injection unit (170). The detergent storage unit functions to store a detergent for cleaning the pipes of the refrigeration cycle.

[0205] The above detergent storage unit is connected to the refrigerant injection unit (170) to provide detergent to the refrigeration cycle through the jig body (110). The detergent in the detergent storage unit can be injected into the refrigeration cycle through the refrigerant injection unit (170).

[0206] In this embodiment, for example, the vacuum connection part (120) may have a first outer diameter (D1), the low pressure connection part (130), the high pressure connection part (140) and the vacuum sensor connection part (150) may have a second outer diameter (D2), and the pressure sensor connection part (160) and the refrigerant injection part (170) may have a third outer diameter (D3).

[0207] And the first outer diameter (D1) is formed to be larger than the second outer diameter (D2) and the third outer diameter (D3), and the second outer diameter (D2) and the third outer diameter (D3) can be formed to have the same size.

[0208] However, it is not limited thereto, and the outer diameters of the vacuum connection part (120), low pressure connection part (130), high pressure connection part (140), vacuum sensor connection part (150), pressure sensor connection part (160), and refrigerant injection part (170) may be formed differently from each other.

[0209] In addition, the locations where the vacuum connection part (120), low pressure connection part (130), high pressure connection part (140), vacuum sensor connection part (150), pressure sensor connection part (160), and refrigerant injection part (170) are provided can also be designed in various ways.

[0210] Fig. 5 is a cross-sectional view showing the interior of a jig device according to another embodiment of the present invention.

[0211] This embodiment is identical to the previously described embodiment in other respects, with the only difference being the configuration of the jig body. Therefore, only the characteristic aspects of this embodiment will be described below, and the same parts as the previously described embodiment will be referenced.

[0212] Referring to FIG. 5, a jig device (100) according to another embodiment of the present invention may include a jig body (110).

[0213] The above jig body (110) may be formed in a housing shape with an empty interior. For example, the jig body (110) may have a hexahedral shape with an empty interior.

[0214] The above jig body (110) may be formed of a metal material. For example, the above jig body (110) may be composed of two parts that can be joined together.

[0215] In detail, the jig body (110) may include a front portion (111), a rear portion (112), a first side portion (113), a second side portion (114), an upper portion, and a lower portion.

[0216] The front portion (111) forms the front exterior of the jig body (110). The front portion (111) may be formed in a flat shape.

[0217] The rear portion (112) forms the rear exterior of the jig body (110). The rear portion (112) may be formed in a flat shape.

[0218] The front part (111) and the rear part (112) may be arranged to face each other. The front part (111) and the rear part (112) may be formed to have the same size.

[0219] The first side portion (113) connects one side of the front portion (111) and the rear portion (112), and forms one side of the jig body (110). The first side portion (113) can form the left side appearance of the jig body (110). The first side portion (113) can be formed in a flat shape.

[0220] The second side portion (114) connects the other side of the front portion (111) and the rear portion (112), and forms the other side of the jig body (110). The second side portion (114) can form the right side appearance of the jig body (110). The second side portion (114) can be formed in a flat shape.

[0221] The first side portion (113) and the second side portion (114) may be arranged to face each other. The first side portion (113) and the second side portion (114) may be formed to have the same size.

[0222] The upper surface connects the upper side of the front surface (111) and the rear surface (112), and forms the upper surface of the jig body (110). The upper surface may be formed in a flat shape.

[0223] The above lower surface connects the lower side of the front surface (111) and the rear surface (112), and forms the lower surface of the jig body (110). The above lower surface may be formed in a flat shape.

[0224] The upper surface and the lower surface may be arranged to face each other. The upper surface and the lower surface may be formed to have the same size.

[0225] A fluid flow space (110a) is formed inside the jig body (110) in which fluid flows. The fluid flow space (110a) may be understood as an internal space of the jig body (110). For example, the fluid flow space (110a) may be formed in a hexahedral shape.

[0226] Here, the fluid may include air, gas, refrigerant, oil, etc.

[0227] The above-mentioned fluid space (110a) can be connected to multiple ports. A single fluid space (110a) connected to all multiple ports can be formed inside the jig body (110).

[0228] The above jig device (100) may include a vacuum connection (120), a low pressure connection (130), a high pressure connection (140), a vacuum sensor connection (150), a pressure sensor connection (160), and a refrigerant injection part (170) provided in the jig body (110).

[0229] The above vacuum connection (120), low pressure connection (130), high pressure connection (140), vacuum sensor connection (150), pressure sensor connection (160), and refrigerant injection part (170) are the same as the configuration described above, so a detailed description thereof will be omitted.

[0230] A first penetration portion (110b) through which the vacuum connection portion (120) passes may be formed in the above jig body (110). The first penetration portion (110b) is a portion through which the vacuum connection portion (120) passes and is inserted.

[0231] The first penetration portion (110b) may be formed on the front side (111) of the jig body (110). For example, the first penetration portion (110b) may be formed at the center of the front side (111) of the jig body (110).

[0232] When a part of the vacuum connection part (120) is inserted into the first penetration part (110b), the inside of the vacuum connection part (120) and the flow space (110a) can be connected.

[0233] The above vacuum connection part (120) may be formed in a tube or nipple shape. The above vacuum connection part (120) may be formed of the same metal material as the jig body (110).

[0234] The outer diameter (D1) of the above vacuum connection portion (120) can be formed to be the same as or smaller than the outer diameter of the first through-hole portion (110b).

[0235] In order to prevent air leakage between the first through-hole (110b) and the vacuum connection (120), a sealing member may be provided between the first through-hole (110b) and the vacuum connection (120).

[0236] The sealing member may be provided on the outer surface of the vacuum connection portion (120) or on the inner surface of the first through-hole portion (110b). For example, the sealing member may be fixed to the inner surface of the first through-hole portion (110b) by being pressed or fused.

[0237] By means of the sealing member, the vacuum connection part (120) can be firmly fixed to the inside of the jig body (110). In addition, air can be prevented from leaking through the gap of the first penetration part (110b).

[0238] A second penetration portion (110c) through which the low-pressure connection portion (130) passes may be formed in the above jig body (110). The second penetration portion (110c) is a portion through which the low-pressure connection portion (130) passes and is inserted.

[0239] The above second penetration portion (110c) can be formed on the rear surface (112) of the jig body (110).

[0240] When a part of the low-pressure connecting portion (130) is inserted into the second through-hole portion (110c), the interior of the low-pressure connecting portion (130) and the flow space (110a) can be connected.

[0241] The low-pressure connection part (130) may be formed in a pipe or nipple shape. The low-pressure connection part (130) may be formed of the same metal material as the jig body (110).

[0242] The outer diameter of the above low-pressure connection portion (130) can be formed to be the same as or smaller than the outer diameter of the second through-hole portion (110c).

[0243] In order to prevent air leakage between the second through-hole (110c) and the low-pressure connection (130), a sealing member may be provided between the second through-hole (110c) and the low-pressure connection (130).

[0244] The sealing member may be provided on the outer surface of the low-pressure connecting portion (130) or on the inner surface of the second through-hole portion (110c). For example, the sealing member may be fixed to the inner surface of the second through-hole portion (110c) by being pressed or fused.

[0245] By means of the above sealing member, the low-pressure connecting portion (130) can be firmly fixed to the inside of the jig body (110). In addition, air can be prevented from leaking through the gap of the second through-hole portion (110c).

[0246] A third penetration portion (110d) through which the high-pressure connection portion (140) passes may be formed in the above jig body (110). The third penetration portion (110d) is a portion through which the high-pressure connection portion (140) passes and is inserted.

[0247] The above third penetration portion (110d) can be formed on the rear surface (112) of the jig body (110).

[0248] When a part of the high-pressure connection part (140) is inserted into the third penetration part (110d), the inside of the high-pressure connection part (140) and the flow space (110a) can be connected.

[0249] The high-pressure connection part (140) may be formed in a pipe or nipple shape. The high-pressure connection part (140) may be formed of the same metal material as the jig body (110).

[0250] The outer diameter of the high-pressure connection portion (140) may be formed to be the same as or smaller than the outer diameter of the third through-hole portion (110d).

[0251] In order to prevent air leakage between the third penetration portion (110d) and the high-pressure connection portion (140), a sealing member may be provided between the third penetration portion (110d) and the high-pressure connection portion (140).

[0252] The sealing member may be provided on the outer surface of the high-pressure connecting portion (140) or on the inner surface of the third through-hole portion (110d). For example, the sealing member may be fixed to the inner surface of the third through-hole portion (110d) by being pressed or fused.

[0253] By means of the above sealing member, the high-pressure connection part (140) can be strongly fixed to the inside of the jig body (110). In addition, air can be prevented from leaking through the gap of the third penetration part (110d).

[0254] A fourth penetration portion (110e) through which the vacuum sensor connection portion (150) passes may be formed in the above jig body (110). The fourth penetration portion (110e) is a portion through which the vacuum sensor connection portion (150) passes and is inserted.

[0255] The fourth penetration portion (110e) may be formed on the rear surface (112) of the jig body (110). The fourth penetration portion (110e) may be positioned facing the first penetration portion (110b).

[0256] When a part of the vacuum sensor connection part (150) is inserted into the fourth penetration part (110e), the inside of the vacuum sensor connection part (150) and the flow space (110a) can be connected.

[0257] The vacuum sensor connection part (150) may be formed in a tube or nipple shape. The vacuum sensor connection part (150) may be formed of the same metal material as the jig body (110).

[0258] The outer diameter of the above vacuum sensor connection part (150) can be formed to be the same as or smaller than the outer diameter of the fourth penetration part (110e).

[0259] In order to prevent air leakage between the fourth through-hole (110e) and the vacuum sensor connection portion (150), a sealing member may be provided between the fourth through-hole (110e) and the vacuum sensor connection portion (150).

[0260] The above sealing member may be provided on the outer surface of the vacuum sensor connection portion (150) or on the inner surface of the fourth penetration portion (110e). For example, the sealing member may be fixed to the inner surface of the fourth penetration portion (110e) by being pressed or fused.

[0261] By means of the sealing member, the vacuum sensor connection part (150) can be firmly fixed to the inside of the jig body (110). In addition, air can be prevented from leaking through the gap of the fourth through-hole part (110e).

[0262] The above fourth penetration portion (110e) can be placed between the second penetration portion (110c) and the third penetration portion (110d).

[0263] Specifically, the fourth penetration portion (110e) may be positioned at a midpoint between the second penetration portion (110c) and the third penetration portion (110d).

[0264] By placing the vacuum sensor connection part (150) at a midpoint between the low pressure connection part (130) and the high pressure connection part (140), the sensing accuracy of the vacuum sensor (300) can be improved.

[0265] A fifth penetration portion (110f) through which the pressure sensor connection portion (160) passes may be formed in the jig body (110). The fifth penetration portion (110f) is a portion through which the pressure sensor connection portion (120) passes and is inserted.

[0266] The fifth penetration portion (110f) may be formed on the second side portion (114) of the jig body (110). For example, the fifth penetration portion (110f) may be formed at the center of the second side portion (114) of the jig body (110).

[0267] When a part of the pressure sensor connection part (160) is inserted into the fifth penetration part (110f), the inside of the pressure sensor connection part (160) and the flow space (110a) can be connected.

[0268] The pressure sensor connection part (160) may be formed in a tube or nipple shape. The pressure sensor connection part (160) may be formed of the same metal material as the jig body (110).

[0269] The outer diameter of the pressure sensor connection portion (160) may be formed to be the same as or smaller than the outer diameter of the fifth through-hole portion (110f).

[0270] In order to prevent air leakage between the fifth through-hole (110f) and the pressure sensor connection part (160), a sealing member may be provided between the fifth through-hole (110f) and the pressure sensor connection part (160).

[0271] The above sealing member may be provided on the outer surface of the pressure sensor connection portion (160) or on the inner surface of the fifth through-hole portion (110f). For example, the sealing member may be fixed to the inner surface of the fifth through-hole portion (110f) by being pressed or fused.

[0272] By means of the above sealing member, the pressure sensor connection part (160) can be firmly fixed to the inside of the jig body (110). In addition, air can be prevented from leaking through the gap of the fifth through-hole part (110f).

[0273] A sixth through-hole (110g) through which the refrigerant injection part (170) passes may be formed in the above jig body (110). The sixth through-hole (110g) is a portion through which the refrigerant injection part (170) passes and is inserted.

[0274] The sixth through-hole (110g) may be formed on the first side portion (113) of the jig body (110). For example, the sixth through-hole (110g) may be formed at the center of the first side portion (113) of the jig body (110). The sixth through-hole (110g) may be positioned to face the fifth through-hole (110f).

[0275] When a part of the refrigerant injection part (170) is inserted into the sixth through-hole part (110g), the inside of the refrigerant injection part (170) and the flow space (110a) can be connected.

[0276] The above refrigerant injection part (170) may be formed in a pipe or nipple shape. The above refrigerant injection part (170) may be formed of the same metal material as the jig body (110).

[0277] The outer diameter of the above refrigerant injection portion (170) can be formed to be the same as or smaller than the outer diameter of the sixth through-hole portion (110g).

[0278] In order to prevent air leakage between the sixth through-hole (110g) and the refrigerant injection portion (170), a sealing member may be provided between the sixth through-hole (110g) and the refrigerant injection portion (170).

[0279] The sealing member may be provided on the outer surface of the refrigerant injection portion (170) or on the inner surface of the sixth through-hole portion (110g). For example, the sealing member may be fixed to the inner surface of the sixth through-hole portion (110g) by being pressed or fused.

[0280] By means of the above sealing member, the refrigerant injection part (170) can be firmly fixed to the inside of the jig body (110). In addition, air can be prevented from leaking through the gap of the sixth through-hole part (110g).

[0281] Figure 6 is a system diagram showing the refrigeration cycle of a refrigerator according to an embodiment of the present invention.

[0282] Referring to FIG. 6, a refrigeration cycle (600) of a refrigerator according to an embodiment of the present invention includes a compressor (610) that compresses a low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, a condenser (620) that phase-changes the high-temperature, high-pressure gaseous refrigerant compressed by the compressor (610) into a high-temperature, high-pressure liquid refrigerant, an expansion valve (630) that expands the high-temperature, high-pressure liquid refrigerant that has passed through the condenser (620) into a low-temperature, low-pressure two-phase refrigerant, and an evaporator (640) that phase-changes the low-temperature, low-pressure two-phase refrigerant that has passed through the expansion valve (630) into a low-temperature, low-pressure gaseous refrigerant.

[0283] The compressor (610), condenser (620), expansion valve (630) and evaporator (640) are connected by a refrigerant pipe (680), and the refrigerant circulates along the refrigerant pipe (680).

[0284] Accordingly, the refrigerant circulating along the refrigerant pipe (680) releases heat to the surroundings as it condenses in the condenser (620), and absorbs heat from the surroundings as it evaporates in the evaporator (640), and a cooling effect is achieved by the evaporator (640).

[0285] The above evaporator (640) may include a first evaporator (641) and a second evaporator (642).

[0286] The above first evaporator (641) and the above second evaporator (642) can be arranged in parallel.

[0287] The above first evaporator (641) may be an evaporator for cooling a refrigerator compartment, and the above second evaporator (642) may be an evaporator for cooling a freezer compartment.

[0288] The above expansion valve (630) may include a first expansion valve (631) and a second expansion valve (632).

[0289] The first expansion valve (631) and the second expansion valve (632) can be arranged in parallel.

[0290] The first expansion valve (631) may be connected to the inlet side of the first evaporator (641), and the second expansion valve (632) may be connected to the inlet side of the second evaporator (641).

[0291] The above refrigeration cycle (600) may include a dryer (650).

[0292] The above dryer (650) has the function of removing moisture and impurities from the refrigerant circulating through the refrigerant pipe (680). The dryer (650) can be connected to the outlet side of the condenser (620).

[0293] The above refrigeration cycle (600) may include a valve device (660).

[0294] The above valve device (660) functions to change the flow direction of the refrigerant circulating through the refrigerant pipe (680). In addition, the valve device (660) functions to distribute and introduce the refrigerant introduced from the dryer (650) into the first evaporator (641) and the second evaporator (642).

[0295] The above valve device (660) may include one inlet and two outlets. For example, the valve device (660) may include a three-way valve.

[0296] The inlet side of the valve device (660) can be connected to the dryer (650), and the outlet side of the valve device (660) can be connected to the first expansion valve (631) and the second expansion valve (632), respectively.

[0297] The above refrigerant pipe (680) connects the compressor (610), condenser (620), dryer (650), valve device (660), expansion valve (630), and evaporator (640) to each other, so that the refrigerant circulates through each component.

[0298] The above refrigerant pipe (680) may include a suction pipe (681) connected to the suction side of the compressor (610).

[0299] The above suction pipe (681) connects the evaporator (640) and the compressor (610). The refrigerant discharged from the evaporator (640) can be guided to the suction side of the compressor (610) through the suction pipe (681).

[0300] The above refrigerant pipe (680) may include a discharge pipe (682) connected to the discharge side of the compressor (610).

[0301] The above discharge pipe (682) connects the compressor (610) and the condenser (620). The refrigerant discharged from the compressor (610) can be guided to the inlet side of the condenser (620) through the discharge pipe (682).

[0302] The above refrigerant pipe (680) may include a condensation pipe (683) connected to the outlet side of the condenser (620).

[0303] The above condensation pipe (683) connects the condenser (620) and the dryer (650). The refrigerant discharged from the condenser (620) can be guided to the inlet side of the dryer (650) through the condensation pipe (683).

[0304] The above refrigerant pipe (680) may include a first connecting pipe (684) connected to the outlet side of the dryer (650).

[0305] The first connecting pipe (684) connects the dryer (650) and the valve device (660). The refrigerant discharged from the dryer (650) can be guided to the inlet side of the valve device (660) through the first connecting pipe (684).

[0306] The above refrigerant pipe (680) may include a second connecting pipe (685) connected to the outlet side of the valve device (660).

[0307] The second connecting pipe (685) connects the valve device (660) and the expansion valve (630). The refrigerant discharged from the valve device (660) can be guided to the inlet side of the expansion valve (630) through the second connecting pipe (685).

[0308] The second connecting pipe (685) is composed of two and can be connected to each discharge side of the valve device (660). The refrigerant discharged from the valve device (660) can be guided to the first expansion valve (631) and the second expansion valve (632) through the second connecting pipe (685), respectively.

[0309] The above refrigerant pipe (680) may include an expansion pipe (686) connected to the outlet side of the expansion valve (630).

[0310] The above expansion pipe (686) connects the expansion valve (630) and the evaporator (640). The refrigerant discharged from the expansion valve (630) can be guided to the inlet side of the evaporator (640) through the expansion pipe (686).

[0311] The above expansion pipe (686) is composed of two and can be connected to the discharge sides of the first expansion valve (631) and the second expansion valve (632), respectively. The refrigerant discharged from the expansion valve (630) can be guided to the first evaporator (641) and the second evaporator (642) through the expansion pipe (686), respectively.

[0312] The above refrigerant pipe (680) may include an evaporation pipe (687) connected to the outlet side of the evaporator (640).

[0313] The above evaporation pipe (687) connects the evaporator (640) and the suction pipe (681). The refrigerant discharged from the evaporator (640) can be guided to the suction pipe (681) through the evaporation pipe (687).

[0314] The above evaporation pipe (687) is composed of two and can be connected to the discharge sides of the first evaporator (641) and the second evaporator (642). In addition, the two evaporation pipes (687) can be combined at a junction point.

[0315] The refrigerants discharged from the first evaporator (641) and the second evaporator (642) are combined at the merging point through the evaporation pipe (687), and then guided to the suction pipe (681) to be sucked into the suction side of the compressor (610).

[0316] The above refrigerant pipe (680) may include an injection pipe (688) for replenishing refrigerant to the compressor (610).

[0317] The above injection pipe (688) can be connected to the suction side of the compressor (610). An operator can inject refrigerant into the interior of the compressor (610) through the injection pipe (688).

[0318] The above refrigerant pipe (680) may include an extension pipe (689) extending from one side of the dryer (650).

[0319] The above extension pipe (689) can be connected to the inlet side of the dryer (650). An operator can inject refrigerant or detergent into the interior of the dryer (650) through the extension pipe (689).

[0320] The above compressor (610), expansion valve (630) and evaporator (640) are components through which low-pressure refrigerant flows, and can be called a “low-pressure section” or “low-pressure section area.”

[0321] The above condenser (620), dryer (650) and valve device (660) are components through which high-pressure refrigerant flows, and can be called a “high-pressure section” or “high-pressure section area.”

[0322] FIG. 7 is a system diagram showing a jig device according to an embodiment of the present invention connected to a refrigeration cycle of a refrigerator, and FIG. 8 is a diagram showing a jig device according to an embodiment of the present invention connected to a refrigeration cycle of a refrigerator.

[0323] Referring to FIGS. 7 and 8, the jig device (100) can be connected to the refrigeration cycle (600) of the refrigerator (10) for repairing the refrigerator (10).

[0324] The worker can perform various processes such as product vacuum, vacuum leak inspection, and refrigerant injection by connecting the above jig device (100) to the above refrigeration cycle (600).

[0325] The above vacuum connection (120) is connected to the vacuum pump (200). The vacuum pump (200) can be connected to the vacuum connection (120) through the vacuum line (210).

[0326] The above vacuum line (210) can be understood as a hose connecting the vacuum pump (200) and the jig device (100).

[0327] The above vacuum line (210) may be formed of an elastic and flexible material. The outer diameter of the vacuum line (210) may be formed to be larger than the outer diameters of the low pressure line (137) and the high pressure line (147).

[0328] One end of the vacuum line (210) can be connected to the connection part (210) of the vacuum pump (200), and the other end of the vacuum line (210) can be connected to the vacuum connection part (120) of the jig device (100).

[0329] The above vacuum line (210) may be provided with an elastic member (220) to prevent excessive bending of the vacuum line (210).

[0330] The elastic member (220) may be provided on the outer surface of the vacuum line (210). For example, the elastic member (220) may include a spring. The elastic member (220) may extend to surround a portion of the outer surface of the vacuum line (210).

[0331] The elastic member (220) may be provided in multiple pieces on the outer surface of the vacuum line (210). For example, the elastic member (220) may include a first elastic member (221) provided at one end of the vacuum line (210) and a second elastic member (222) provided at the other end of the vacuum line (210).

[0332] The first elastic member (221) and the second elastic member (222) may be spaced apart from each other. The first elastic member (221) and the second elastic member (222) may have the same shape and size.

[0333] Accordingly, the vacuum line (210) can be prevented from being excessively bent in the process in which one end of the vacuum line (210) is connected to the vacuum pump (200), and the vacuum line (210) can be prevented from being excessively bent in the process in which the other end of the vacuum line (210) is connected to the vacuum connection part (120).

[0334] The low pressure connection (130) is connected to the compressor (610). The low pressure connection (130) can be connected to an injection pipe (688) provided in the compressor (610). The compressor (610) can be connected to the low pressure connection (130) through the low pressure line (137).

[0335] The low pressure connection (130) or the low pressure line (137) is provided with the low pressure valve (135) to allow or block flow between the low pressure connection (130) and the compressor (610).

[0336] The high pressure connection (140) is connected to the dryer (650). The high pressure connection (140) can be connected to an extension pipe (689) provided in the dryer (650). The dryer (650) can be connected to the high pressure connection (140) via the high pressure line (147).

[0337] The high pressure connection part (140) or the high pressure line (147) is provided with the high pressure valve (145) to allow or block the flow between the high pressure connection part (140) and the dryer (650).

[0338] The above vacuum sensor connection part (150) is connected to the vacuum sensor (300). The vacuum sensor (300) can be coupled or connected to the vacuum sensor connection part (150).

[0339] The above pressure sensor connection part (160) is connected to the pressure sensor (400). The pressure sensor (400) can be coupled or connected to the pressure sensor connection part (150).

[0340] The above refrigerant injection unit (170) is connected to the above refrigerant storage unit (500). The above refrigerant storage unit (500) can be coupled or fastened to the above refrigerant injection unit (170).

[0341] Alternatively, the refrigerant storage unit (500) may be connected to the refrigerant injection unit (170) via a coupler (175). The coupler (175) may be equipped with a valve that restricts the flow of fluid. The valve may be operated to open or close, thereby allowing or blocking the flow of fluid.

[0342] A detergent storage unit can be optionally connected to the above coupler (175).

[0343] Below, a method for performing various processes such as product vacuum, vacuum leak testing, and refrigerant injection using a jig device is described in detail with reference to drawings.

[0344] Figure 9 is a flowchart schematically showing a refrigeration cycle inspection method using a jig device according to an embodiment of the present invention.

[0345] Referring to Figure 9, a refrigeration cycle inspection can be performed using a jig device. For example, a refrigeration cycle inspection can be performed when a refrigerator requires repair due to a compressor failure or refrigerant leak.

[0346] First, check the amount of refrigerant circulating in the refrigeration cycle (600) of the refrigerator (10).

[0347] For example, in order to check the amount of refrigerant circulating in the refrigeration cycle (600), the pressure (equilibrium pressure) of the refrigeration cycle (600) can be measured. The pressure can be measured by the pressure sensor (400).

[0348] Here, equilibrium pressure may refer to the pressure when the compressor is stopped, the refrigerant does not flow, and the entire cycle pressure is balanced.

[0349] That is, based on the measured pressure at the normal cycle state, it is possible to determine whether there is a cycle failure, a compressor failure, or a refrigerant leak.

[0350] As another example, a refrigerant amount measuring device can be used to check the amount of refrigerant circulating in the refrigeration cycle (600).

[0351] The above refrigerant amount measuring device may include a load cell capable of measuring the amount of refrigerant. The above refrigerant amount measuring device may be provided on one side of the refrigeration cycle (600).

[0352] By this method, it is possible to determine whether the amount of refrigerant in the refrigeration cycle (600) is sufficient or insufficient. If the amount of refrigerant in the refrigeration cycle (600) is insufficient, it can be determined that a refrigerant leak has occurred in the refrigeration cycle (600) (S10).

[0353] Once the amount of refrigerant is confirmed, the compressor (610) is driven to determine whether a compressor malfunction has occurred.

[0354] For example, it is possible to determine whether a compressor malfunction has occurred by checking the operating frequency (or current) of the compressor (610), the suction-side pressure and discharge-side pressure of the compressor, the suction-side temperature and discharge-side temperature of the compressor, and the evaporation temperature of the evaporator (S20, S30).

[0355] If a compressor malfunction occurs, the worker performs the refrigerant removal operation after replacing the compressor (610), and if a compressor malfunction does not occur, the refrigerant removal operation can be performed without replacing the compressor (610).

[0356] In order to quickly create a vacuum state inside the above refrigeration cycle (600), the refrigerant removal operation may be performed first before the product vacuum operation.

[0357] For example, the worker can cut one of the refrigerant pipes (680) to discharge the refrigerant circulating through the refrigerant pipe (680) to the outside. That is, the refrigerant in the refrigerant pipe (680) can be removed by discharging it to the outside space without recovering and reusing it (S40, S50).

[0358] Once the refrigerant removal is complete, the product can be vacuumed.

[0359] Here, the product vacuum operation can be understood as an operation of removing gas and moisture from the refrigerant pipe (680) by connecting the vacuum pump (200) to the refrigeration cycle (600) and measuring the vacuum level or airtightness.

[0360] In order to perform the above product vacuum, the jig device (100) to which the vacuum pump (200) is connected can be connected to the refrigeration cycle (600).

[0361] For example, the vacuum connection (120) may be connected to the vacuum pump (200) by the vacuum line (210), the low pressure connection (130) may be connected to the compressor (610) by the low pressure line (137), and the high pressure connection (140) may be connected to the dryer (650) by the high pressure line (147).

[0362] When the vacuum pump (200) is driven while the vacuum pump (200) and the refrigeration cycle (600) are connected through the jig device (100), vacuum pressure is applied to the inside of the refrigeration cycle (600) through the low-pressure connection part (130) and the high-pressure connection part (140), so that the inside of the refrigeration cycle (600) can be in a vacuum state (S60).

[0363] Once the above product is vacuumed, a vacuum leak test can be performed.

[0364] Here, the vacuum leak test can be understood as a test to detect a leak in the refrigeration cycle (600) by operating the low pressure valve (135) or the high pressure valve (145) in a state where the product is vacuumed.

[0365] For example, by closing and opening the low pressure valve (135) while the vacuum pump (200) is operating, it is possible to determine whether a leak has occurred in the low pressure region (601) of the refrigeration cycle (600).

[0366] In addition, while the vacuum pump (200) is operating, the high pressure valve (125) is closed and opened, and it is possible to determine whether a leak has occurred in the high pressure region (602) of the refrigeration cycle (600) (S70).

[0367] If a vacuum leak test determines a leak has occurred, the leak is identified and repaired. Once the leak repair is complete, the product vacuum stage (S60) described above is initiated, allowing for re-evacuation and vacuum leak testing (S80, S90).

[0368] If the vacuum leak test results show that no leaks have occurred, refrigerant injection can be performed.

[0369] Here, the refrigerant injection operation can be understood as an operation of injecting an appropriate amount of refrigerant into the refrigeration cycle (600) through the jig device (100) after the vacuum leak test has been completed.

[0370] For example, a refrigerant storage unit (500) in which refrigerant to be injected into the refrigeration cycle (600) is stored may be connected to the jig device (100). The refrigerant storage unit (500) may be connected to the refrigerant injection unit (170) by the coupler (175).

[0371] And by opening the valve provided in the coupler (175), the refrigerant in the refrigerant storage unit (500) can be injected into the interior of the refrigeration cycle (600) through the refrigerant injection unit (170) (S100).

[0372] Once the refrigerant injection is complete, the compressor (610) can be driven to perform product testing.

[0373] FIG. 10 is a flowchart showing a product vacuum method using a jig device according to an embodiment of the present invention, and FIG. 11 is a system diagram showing a product vacuum method using a jig device according to an embodiment of the present invention.

[0374] Referring to FIGS. 10 and 11, product vacuum work can be performed using the jig device (100).

[0375] Here, the product vacuum operation can be understood as an operation of removing gas and moisture from the refrigerant pipe (680) by connecting the vacuum pump (200) to the refrigeration cycle (600) and measuring the vacuum level or airtightness.

[0376] For this purpose, the jig device (100) can be connected to the refrigeration cycle (600) and the vacuum pump (200) (S61).

[0377] First, the low pressure line (137) connected to the low pressure connection (130) is connected to the compressor (610). Specifically, the low pressure line (137) can be connected to an injection pipe (688) provided in the compressor (610) (S62).

[0378] In addition, the high-pressure line (147) connected to the high-pressure connection part (140) is connected to the dryer (650). Specifically, the high-pressure line (147) can be connected to an extension pipe (689) provided in the dryer (650) (S63).

[0379] Additionally, the vacuum line (210) connected to the vacuum connection part (120) is connected to the vacuum pump (200) (S64).

[0380] Additionally, the vacuum sensor (300) is connected to the vacuum sensor connection part (150) (S65).

[0381] Steps S62, S63, S64, and S65 can be performed in any order.

[0382] When the connection of the refrigeration cycle (600), the vacuum pump (200) and the vacuum sensor (300) to the jig device (100) is completed, the low pressure valve (135) and the high pressure valve (145) are opened and the vacuum pump (200) is driven.

[0383] When the vacuum pump (200) is driven, vacuum pressure is applied to the inside of the refrigeration cycle (600) through the low pressure connection (130) and the high pressure connection (140), so that the inside of the refrigeration cycle (600) can be in a vacuum state (S66, S67).

[0384] After the standard time has elapsed since the above vacuum pump (200) was driven, the vacuum level is checked through the vacuum sensor (300).

[0385] For example, the vacuum level may be 0.5 Torr or less within 10 minutes after the vacuum pump (200) is driven. Alternatively, the vacuum level may be close to 1 Torr within 5 minutes after the vacuum pump (200) is driven.

[0386] FIG. 12 is a flowchart showing a vacuum leak inspection method using a jig device according to an embodiment of the present invention, FIGS. 13 and 14 are system diagrams showing a vacuum leak inspection method using a jig device according to an embodiment of the present invention, and FIG. 15 is a graph showing a change in vacuum level when a leak occurs in a low pressure section of a refrigeration cycle according to an embodiment of the present invention.

[0387] Referring to Fig. 12, a vacuum leak test can be performed using the jig device (100). The vacuum leak test can be performed after the product is vacuumed.

[0388] Here, the vacuum leak test can be understood as a test to detect a leak in the refrigeration cycle (600) using the low pressure valve (135) or the high pressure valve (145) when the product is vacuumed.

[0389] A vacuum leak test can be performed while the above vacuum pump (200) is operating (S71).

[0390] First, close the valve device (660).

[0391] The reason for closing the above valve device (660) is to detect a leak by distinguishing between the low pressure section (601) and the high pressure section (602) of the refrigeration cycle (600).

[0392] That is, the valve device (660) can be closed to determine whether a leak has occurred in either the low-pressure section (601) or the high-pressure section (602) (S72).

[0393] When the above valve device (660) is closed, the vacuum level change is confirmed by closing and opening the low pressure valve (135).

[0394] For example, as shown in Fig. 13, after closing the low pressure valve (135) while the valve device (660) is closed, the change in vacuum level is confirmed through the vacuum sensor (300).

[0395] If a leak occurs in the low pressure section (601), the low pressure valve (135) connected to the low pressure section (601) is closed, so the vacuum level can continuously decrease.

[0396] Additionally, after opening the low pressure valve (135) while the valve device (660) is closed, the change in vacuum level is confirmed through the vacuum sensor (300).

[0397] If a leak occurs in the low pressure section (601), the low pressure valve (135) connected to the low pressure section (601) is open, so the vacuum level can continuously increase.

[0398] As shown in the graph in Fig. 15, when the low pressure valve (135) is open, the vacuum level can continuously increase.

[0399] For example, the vacuum level may approach 60 Torr within 1 minute after the vacuum pump (200) is driven. Alternatively, the vacuum level may not be achieved within 10 minutes after the vacuum pump (200) is driven.

[0400] Therefore, it is possible to determine whether there is a leak in the low pressure section (601) by operating the low pressure valve (135) (S73).

[0401] If it is determined as a result of the low-pressure part leak test that a leak has occurred in the low-pressure part (601), the leaking area in the low-pressure part (601) is checked and repaired.

[0402] For example, the occurrence of a leak in the low pressure section (601) may mean that a leak has occurred in at least one of the evaporator (640), the suction pipe (681), and the injection pipe (688). Therefore, the leak can be prevented by repairing or replacing at least one of the evaporator (640), the suction pipe (681), and the injection pipe (688) (S74, S75).

[0403] Once the repair of the leak area is completed, the product vacuum described above can be performed again (S76).

[0404] If it is determined that no leakage has occurred in the low pressure section (601), steps S75 and S76 can be skipped and step S77 can be entered.

[0405] Next, the vacuum change is confirmed by closing and opening the high pressure valve (145).

[0406] For example, as shown in Fig. 14, after closing the high pressure valve (145) while the valve device (660) is closed, the change in vacuum level is confirmed through the vacuum sensor (300).

[0407] If a leak occurs in the high pressure section (602), the high pressure valve (145) connected to the high pressure section (602) is closed, so the vacuum level can continuously decrease.

[0408] Additionally, after opening the high pressure valve (145) while the valve device (660) is closed, the change in vacuum level is confirmed through the vacuum sensor (300).

[0409] If a leak occurs in the high pressure section (602), the high pressure valve (145) connected to the high pressure section (602) is open, so the vacuum level can continuously increase.

[0410] For example, the vacuum level can be 0.2 Torr or higher 5 minutes after the vacuum pump (200) is driven.

[0411] Therefore, it is possible to determine whether there is a leak in the high pressure section (602) by operating the high pressure valve (145) (S77).

[0412] If it is determined as a result of the high-pressure part leak test that a leak has occurred in the high-pressure part (602), the leaking area in the high-pressure part (602) is checked and repaired.

[0413] For example, the occurrence of a leak in the high pressure section (602) may mean that a leak has occurred in at least one of the condenser (620), the dryer (650), the discharge pipe (682), and the condensation pipe (683). Therefore, the leak can be prevented by repairing or replacing at least one of the condenser (620), the dryer (650), the discharge pipe (682), and the condensation pipe (683) (S78, S79).

[0414] FIG. 16 is a flowchart showing a high-pressure vacuum leak inspection method using a jig device according to an embodiment of the present invention, and FIG. 17 is a drawing showing a jig device according to an embodiment of the present invention connected to a refrigeration cycle of a refrigerator.

[0415] FIG. 18 and FIG. 19 are system diagrams showing a high-pressure vacuum leak inspection method using a jig device according to an embodiment of the present invention, and FIG. 20 is a graph showing a change in vacuum level when a leak occurs in the high-pressure section of a refrigeration cycle according to an embodiment of the present invention.

[0416] Referring to FIGS. 16 and 17, a high-pressure vacuum leak test can be performed using the jig device (100).

[0417] Here, the high-pressure vacuum leak test can be understood as a test to detect the leak area of ​​the high-pressure section (602) when a leak occurs in the high-pressure section (602).

[0418] That is, by performing the high-pressure vacuum leak test, it is possible to determine in which part of the condenser (620), dryer (650), discharge pipe (682), and condensation pipe (683) corresponding to the high-pressure part (602) a leak has occurred.

[0419] For example, if a slight leak occurs in the discharge pipe (682) or the condensation pipe (683), there is a problem in that it is difficult to measure the vacuum level through the vacuum line (210) that uses the existing high vacuum pressure.

[0420] Therefore, in this embodiment, a high-pressure vacuum leak inspection method is presented that can accurately determine the leak location even if a slight leak occurs in the high-pressure section (602) (S200).

[0421] First, close the valve device (660).

[0422] The valve device (660) can be closed to form the high pressure section (602) into a vacuum state (S210).

[0423] When the above valve device (660) is closed, the low pressure line (137) connected to the low pressure connection part (130) is connected to the compressor (610). Specifically, the low pressure line (137) can be connected to an injection pipe (688) provided in the compressor (610) (S220).

[0424] In addition, the high-pressure line (147) connected to the high-pressure connection part (140) is connected to the dryer (650). Specifically, the high-pressure line (147) can be connected to an extension pipe (689) provided in the dryer (650) (S230).

[0425] Additionally, the vacuum line (210) connected to the vacuum connection part (120) is connected to the vacuum pump (200) (S240).

[0426] Additionally, an auxiliary vacuum line (230) extending from the vacuum pump (200) is connected to the jig device (100).

[0427] Here, the reason for using the auxiliary vacuum line (230) is to detect micro-leakage of the high pressure section (602).

[0428] That is, when measuring the vacuum level through a vacuum line (210) utilizing a conventional high vacuum pressure, there is a problem in that it is difficult to detect micro-leakage. Therefore, in the present embodiment, the auxiliary vacuum line (230) having an outer diameter smaller than the outer diameter of the vacuum line (210) may be used.

[0429] The above auxiliary vacuum line (230) may be formed of an elastic and flexible material. However, the outer diameter of the auxiliary vacuum line (230) may be formed to be smaller than the outer diameter of the vacuum line (210).

[0430] Specifically, one end of the auxiliary vacuum line (230) may be connected to the connection part (201) of the vacuum pump (200), and the other end of the auxiliary vacuum line (230) may be connected to the refrigerant injection part (170). At this time, the refrigerant storage part (500) may be separated from the refrigerant injection part (170) (S250).

[0431] Additionally, the vacuum sensor (300) is connected to the vacuum sensor connection part (150) (S260).

[0432] Steps S210, S220, S230, S240, S250 and S260 may be performed in any order.

[0433] As shown in Fig. 18, when the connection of the refrigeration cycle (600), the vacuum pump (200), and the vacuum sensor (300) to the jig device (100) is completed, the high-pressure valve (145) is opened, the low-pressure valve (135) is closed, the vacuum line (210) and the auxiliary vacuum valve (230) are opened, and the vacuum pump (200) is driven.

[0434] When the vacuum pump (200) is driven, vacuum pressure is applied inside the refrigeration cycle (600) through the high-pressure connection (130), so that the inside of the refrigeration cycle (600) can be in a vacuum state (S270).

[0435] After the standard time has elapsed since the above vacuum pump (200) was driven, the vacuum level is checked through the vacuum sensor (300) and it is determined whether the standard vacuum level is reached.

[0436] Here, the reference vacuum level can be 0.5 Torr. For example, the vacuum level can approach 0.5 Torr within 5 minutes after the vacuum pump (200) is operated.

[0437] When the vacuum level approaches 0.5 Torr after the above vacuum pump (200) is driven, the high pressure section (602) can be in a vacuum state (S280, S290).

[0438] When it is determined that the above standard vacuum level has been reached, the vacuum line (210) is closed and the auxiliary vacuum line (230) is opened, as shown in FIG. 19.

[0439] Here, the reason for closing the vacuum line (210) and opening the auxiliary vacuum line (230) is to detect micro-leakage using only the auxiliary vacuum line (230). That is, in order to apply a low vacuum pressure to the high-pressure section (602), only the auxiliary vacuum line (230) can be opened (S300).

[0440] And when the standard time has elapsed, the vacuum level is checked through the vacuum sensor (300), and the leak area is checked and repaired according to the vacuum level.

[0441] As shown in the graph in Fig. 20, if a micro-leakage occurs in the high pressure section (602), the vacuum level may continuously increase.

[0442] For example, when the vacuum line (210) is closed in a state where a micro-leakage occurs in the discharge pipe (682) or the condensation pipe (683), the vacuum level can become 20 Torr or more within 10 minutes.

[0443] If no micro-leakage occurs in the high pressure section (602), the vacuum level may continue to decrease.

[0444] For example, when the vacuum line (210) is closed without a micro-leakage occurring in the discharge pipe (682) or the condensation pipe (683), the vacuum level can be 5 Torr or less within 5 minutes.

[0445] Therefore, it is possible to determine whether there is a micro-leakage in the high pressure section (601) through this auxiliary vacuum line (230) (S310, S320).

[0446] FIG. 21 is a flowchart showing a pipe cleaning method using a jig device according to an embodiment of the present invention, FIG. 22 is a drawing showing a jig device according to an embodiment of the present invention connected to a refrigeration cycle of a refrigerator, and FIGS. 23 and 24 are system diagrams showing a pipe cleaning method using a jig device according to an embodiment of the present invention.

[0447] Referring to FIGS. 21 and 22, a pipe cleaning operation can be performed using the jig device (100).

[0448] Here, the pipe cleaning operation can be understood as an operation of injecting a cleaning agent into the interior of the refrigeration cycle (600) to prevent clogging caused by oil and to improve vacuum performance by removing foreign substances and moisture.

[0449] That is, by cleaning the inside of the refrigerant pipe (680), the vacuum performance can be improved, thereby preventing the occurrence of re-failure.

[0450] The above-mentioned cleaning agent may be a gaseous refrigerant or a liquid refrigerant. For example, the refrigerant may be R410a refrigerant. Alternatively, the cleaning agent may be a gas such as nitrogen.

[0451] In this embodiment, the low pressure section (601) and the high pressure section (602) of the refrigeration cycle (600) can be washed separately.

[0452] The reason for washing the low pressure section (601) and the high pressure section (602) separately is that, since a low temperature and low pressure gaseous refrigerant flows in the low pressure section (601), the gaseous refrigerant accumulates in the low pressure section (601), so it is advantageous to use a gaseous cleaning agent.

[0453] In addition, since high-temperature and high-pressure liquid refrigerant flows in the high-pressure section (602), liquid refrigerant accumulates in the high-pressure section (602), so it is advantageous to use a liquid detergent.

[0454] Therefore, in this embodiment, when washing the low-pressure part (601), a gaseous refrigerant can be used, and when washing the high-pressure part (602), a liquid refrigerant can be used.

[0455] Below, an example is provided in which the low-pressure part is washed first and the high-pressure part is washed later.

[0456] However, it is not limited to this, and it is also possible to perform cleaning of the high-pressure part first and cleaning of the low-pressure part later (S400).

[0457] First, the low pressure line (137) connected to the low pressure connection (130) is connected to the valve device (660).

[0458] Specifically, the low pressure line (137) may be connected to the inlet side of the valve device (660). For example, the low pressure line (137) may be connected to the first connecting pipe (684) provided on the inlet side of the valve device (660) (S410).

[0459] Additionally, the high-pressure line (147) connected to the high-pressure connection (140) is connected to the dryer (650).

[0460] Specifically, the high pressure line (147) may be connected to the inlet side of the dryer (650). For example, the high pressure line (147) may be connected to a condensation pipe (683) provided on the inlet side of the dryer (650) (S420).

[0461] Additionally, a washing line (710) extending from the detergent storage unit (700) is connected to the jig device (100).

[0462] Here, the detergent storage unit (700) is a part where gaseous refrigerant or liquid refrigerant for pipe cleaning is stored.

[0463] The above washing line (710) is configured to inject the detergent from the detergent storage unit (700) into the refrigeration cycle (600) through the jig body (100).

[0464] Specifically, one end of the washing line (710) may be connected to the detergent storage unit (700), and the other end of the washing line (710) may be connected to the refrigerant injection unit (160).

[0465] However, it is not limited thereto, and the washing line (710) can be connected to the vacuum sensor connection part (150) or the pressure sensor connection part (160) (S430).

[0466] Additionally, a drain hose (810) extending from the recovery unit (800) is connected to the suction side of the compressor (610).

[0467] Here, the recovery unit (800) is a section where the cleaning agent for pipe cleaning is recovered and stored. The recovery unit (800) can contain oil, foreign substances, moisture, refrigerant, etc. along with the cleaning agent.

[0468] The above drain hose (810) functions to guide the detergent circulated through the refrigeration cycle (600) to the recovery unit (800).

[0469] Specifically, one end of the drain hose (810) can be connected to the recovery unit (800), and the other end of the drain hose (810) can be connected to the suction pipe (681) (S440).

[0470] Steps S410, S420, S430, and S440 may be performed in any order.

[0471] When the connection of the refrigeration cycle (600), the detergent storage unit (700) and the recovery unit (800) to the jig device (100) is completed, the low-pressure valve (135) is opened and the high-pressure valve (145) is closed to clean the low-pressure unit (601).

[0472] When the low pressure valve (135) is opened, the gaseous refrigerant of the detergent storage unit (700) flows into the interior of the valve device (660) through the low pressure line (137).

[0473] The gaseous refrigerant introduced into the valve device (660) can sequentially pass through the expansion valve (630), the evaporator (640), and the discharge pipe (681), and then be recovered to the recovery unit (800) through the drain hose (810).

[0474] That is, the gaseous refrigerant of the detergent storage unit (700) passes through the low-pressure unit (601) and pushes out oil, refrigerant, and foreign substances accumulated in the low-pressure unit (601), thereby performing low-pressure unit cleaning (S450).

[0475] When the low pressure part cleaning is completed, the drain hose (810) is separated and connected to the discharge side of the compressor (610).

[0476] Specifically, one end of the drain hose (810) can be connected to the recovery unit (800), and the other end of the drain hose (810) can be connected to the discharge pipe (682) (S460).

[0477] When the above drain hose (810) is connected, the high pressure valve (145) is opened and the low pressure valve (135) is closed to wash the high pressure part (602).

[0478] At this time, the valve device (660) can be closed.

[0479] When the high pressure valve (145) is opened, the liquid refrigerant of the detergent storage unit (700) flows into the interior of the condensation pipe (683) through the high pressure line (147).

[0480] The liquid refrigerant introduced into the condensation pipe (683) can be sequentially passed through the condenser (620) and the discharge pipe (681), and then recovered to the recovery unit (800) through the drain hose (810).

[0481] That is, the liquid refrigerant of the detergent storage unit (700) passes through the high-pressure unit (602) and pushes out oil, refrigerant, and foreign substances accumulated in the high-pressure unit (601), thereby performing high-pressure unit cleaning.

[0482] In this embodiment, it is described that the low pressure line (137) is connected to the valve device (660) and the high pressure line (147) is connected to the dryer (650).

[0483] However, it is not limited thereto, and it is possible to connect the low pressure line (137) to the dryer (650) and the high pressure line (147) to the valve device (660). In this case, the low pressure valve (135) and the high pressure valve (145) can be controlled in opposite directions to perform pipe cleaning.

[0484] Fig. 25 is a plan view of a jig device according to another embodiment of the present invention, and Fig. 26 is a cross-sectional view showing the inside of the jig device of Fig. 25.

[0485] This embodiment is otherwise identical to the previously described embodiment, with the only notable difference being the configuration of the vacuum sensor, pressure sensor, and display. Therefore, only the distinctive features of this embodiment will be described below, and the same parts as the previously described embodiment will be referenced.

[0486] Referring to FIGS. 25 and 26, a jig device (100) according to another embodiment of the present invention may include a jig body (110), a vacuum connection (120), a low-pressure connection (130), a high-pressure connection (140), and a refrigerant injection part (170).

[0487] The above jig body (110), vacuum connection (120), low pressure connection (130), high pressure connection (140), and refrigerant injection part (170) are the same as the configuration described above.

[0488] A fluid path (117) is formed inside the above jig body (110).

[0489] Here, the fluid may include air, gas, refrigerant, oil, etc.

[0490] The above-mentioned flow path (117) may be formed by penetrating or cutting a portion of the jig body (110). The flow path (117) may be connected to a plurality of ports. A single flow path (117) connected to all of the plurality of ports may be formed inside the jig body (110).

[0491] The above euro (117) may include a plurality of narrow euros.

[0492] For example, the above-mentioned euro (117) may be formed in the shape of a path or manifold.

[0493] According to one embodiment, the euro (117) may include a common euro (117a) and a branch euro branched from the common euro (117a).

[0494] The common flow path (117a) may extend in the left-right direction inside the jig body (110), and the branch flow path may extend in the front-back direction inside the jig body (110).

[0495] The common flow path (117a) may extend in the left and right directions from the inner center of the jig body (110). One side of the common flow path (117a) may extend to the first side portion (113) of the jig body (110). The other side of the common flow path (117a) may extend to the second side portion (114) of the jig body (110). The common flow path (117a) may connect the first side portion (113) and the second side portion (114) of the jig body (110).

[0496] Accordingly, the fluid can flow into the interior of the jig body (110) through the first side portion (113) or the second side portion (114) of the jig body (110). For example, the common flow path (117a) can be formed in a straight line.

[0497] The above branch flow path can branch forward or backward from the above common flow path (117a).

[0498] The above branch flow path may include a first branch flow path (117b) extending forward from the above common flow path (117a).

[0499] The first branch flow path (117b) may extend forward from the center of the common flow path (117a). The first branch flow path (117b) may extend to the front part (111) of the jig body (110).

[0500] Accordingly, fluid can flow into the interior of the jig body (110) through the front part (111) of the jig body (110). For example, the first branch flow path (117b) can be formed in a straight line.

[0501] The above branch flow path may include a second branch flow path (117c) extending rearward from the above common flow path (117a).

[0502] The second branch flow path (117c) may extend rearward from the common flow path (117a). The second branch flow path (117c) may extend to the rear portion (112) of the jig body (110).

[0503] Accordingly, fluid can flow into the interior of the jig body (110) through the rear portion (112) of the jig body (110). For example, the second branch flow path (117c) can be formed in a straight shape.

[0504] The above second branch flow path (117c) may be formed in multiple pieces. A plurality of second branch flow paths (117c) may be connected to the common flow path (117a).

[0505] The above-described plurality of second branch channels (117c) may be spaced apart at regular intervals along the length direction of the above-described common channel (117a). For example, the above-described plurality of second branch channels (117c) may be composed of three.

[0506] The width (W1) of the common flow path (117a) and the width (W3) of the second branch flow path (117c) may be formed to be the same. However, the width (W2) of the first branch flow path (117b) may be formed to be larger than the width (W1) of the common flow path (117a) or the width (W3) of the second branch flow path (117c).

[0507] Specifically, a vacuum line (210) connected to a vacuum pump (200) may be connected to the first branch flow path (117b). Accordingly, since a relatively large vacuum pressure is applied to the first branch flow path (117b), in order to evenly distribute the vacuum pressure applied to the inside of the jig body (110), the width (W2) of the first branch flow path (117b) may be formed to be larger than the widths (W1, W3) of the other flow paths.

[0508] The above jig device (100) may include a vacuum sensor (300) placed inside the jig body (110).

[0509] The vacuum sensor (300) can detect the vacuum state inside the jig body (110). The vacuum sensor (300) is mounted inside the jig body (110) and can measure the vacuum level inside the jig body (110).

[0510] Since the vacuum sensor (300) is mounted inside the jig body (110), there is no need to separately attach the vacuum sensor (300) to the jig body (110), so there is an advantage in that the convenience of use is improved and the product becomes more compact.

[0511] For example, the vacuum sensor (300) can measure the vacuum level using the thermal conductivity of a fluid passing through a heating wire. The vacuum sensor (300) may include a Pirani gauge or a thermocouple gauge.

[0512] The above vacuum sensor (300) can be placed on the above-mentioned euro (117).

[0513] Specifically, the vacuum sensor (300) may be placed in the second branch flow path (117c). The vacuum sensor (300) may be placed at the edge of the second branch flow path (117c). The vacuum sensor (300) may be placed adjacent to the rear surface of the jig body (110).

[0514] For example, the vacuum sensor (300) may be placed facing the vacuum connection part (120). The vacuum sensor (300) may be placed in the second branch flow path (117c) corresponding to between the low pressure connection part (130) and the high pressure connection part (140).

[0515] If the vacuum sensor (300) is placed adjacent to the low pressure connection part (130) or the high pressure connection part (140), accurate sensing of the vacuum sensor (300) may be difficult due to the vacuum pressure applied to the low pressure connection part (130) or the high pressure connection part (140).

[0516] Therefore, in this embodiment, by placing the vacuum sensor (300) at a midpoint between the low pressure connection part (130) and the high pressure connection part (140), the sensing accuracy of the vacuum sensor (300) can be improved.

[0517] The above jig device (100) may include a pressure sensor (400) placed inside the jig body (110).

[0518] The pressure sensor (400) can detect the pressure inside the jig body (110). The pressure sensor (400) is mounted inside the jig body (110) and can measure the pressure inside the jig body (110).

[0519] Since the pressure sensor (400) is mounted inside the jig body (110), there is no need to separately attach the pressure sensor (400) to the jig body (110), so there is an advantage in that the convenience of use is improved and the product becomes more compact.

[0520] For example, the pressure sensor (400) can detect the pressure of a closed space by using the flow rate or velocity of the inflowing fluid. The pressure sensor (400) may include an air pressure sensor or a differential pressure sensor.

[0521] However, it is not limited thereto, and the pressure sensor (400) can measure the pressure inside the jig body (110) using various operating principles.

[0522] The above pressure sensor (400) can be placed on the above-mentioned euro (117).

[0523] Specifically, the pressure sensor (400) may be placed in the common flow path (117a). The pressure sensor (400) may be placed at the edge of the common flow path (117a).

[0524] For example, the pressure sensor (400) may be placed facing the refrigerant injection part (170). The pressure sensor (400) may be placed adjacent to one side of the jig body (110).

[0525] The above jig device (100) may include a display (180) that displays the vacuum pressure or pressure inside the jig body (110).

[0526] The display (180) can display the vacuum level measured by the vacuum sensor (300) or the pressure value measured by the pressure sensor (400). The display (180) can be electrically connected to the vacuum sensor (300) or the pressure sensor (400).

[0527] The above display (180) can be placed on the upper surface (115) of the jig body (110). Therefore, the user can easily check the vacuum level and pressure, etc. through the display (180).

[0528] For example, the display (180) may be provided in a recessed portion formed in the upper surface (115) of the jig body (110). The upper surface (115) of the jig body (110) and the upper surface of the display (180) may be arranged on the same line. Accordingly, the appearance of the jig device (100) may be neat and compact.

[0529] In this embodiment, the vacuum sensor (300) is arranged in the second branch flow path (117c) and the pressure sensor (400) is arranged in the common flow path (117a), but this is not limited thereto.

[0530] For example, the vacuum sensor (300) may be placed at the center of the flow path (117). That is, the vacuum sensor (300) may be placed on the common flow path (117a).

[0531] Additionally, the pressure sensor (400) may be placed at the center of the euro (117). In this case, the vacuum sensor (300) and the pressure sensor (400) may be placed adjacent to each other.

[0532] That is, the vacuum sensor (300) and the pressure sensor (400) can detect the vacuum level and pressure regardless of where they are placed on the path (117).

[0533] Figure 27 is a drawing showing an enlarged view of the display of Figure 25.

[0534] Referring to Fig. 27, the display (180) can display the vacuum level measured by the vacuum sensor (300) or the pressure value measured by the pressure sensor (400). That is, the display (180) can be electrically connected to the vacuum sensor (300) or the pressure sensor (400).

[0535] The above display (180) may include a display unit (181).

[0536] Information related to the vacuum sensor (300) or the pressure sensor (400) can be displayed on the display unit (181).

[0537] For example, the display unit (181) may display current vacuum level (181a), target vacuum level (181b), alarm information (181c), caution information (181d), automatic power-off information (181e), and unit information (181f).

[0538] The current vacuum level (181a) above may display the current vacuum level measured by the vacuum sensor (300).

[0539] The target vacuum level (181b) above can display the target vacuum level set by the operator.

[0540] The above alarm information (181c) can display alarm information when the current vacuum level reaches the target vacuum level.

[0541] The above warning information (181d) can display a warning alarm when a problem occurs in the vacuum sensor (300) or the pressure sensor (400) or when a vacuum is not achieved.

[0542] The above auto-off information (181e) may display the time for auto-off set by the operator.

[0543] The above unit information (181f) may display the vacuum unit set by the operator.

[0544] The above display (180) may include an input unit.

[0545] The input unit is a part that is operated to control the vacuum sensor (300), the pressure sensor (400), or the display unit (181). The input unit may include a physical button or a touch-type button.

[0546] The above input unit may include a button (181) for turning on or off the power of the vacuum sensor (300) or the pressure sensor (400).

[0547] The above input unit may include a button (182) for turning the display (180) on or off.

[0548] The above input unit may include a button (183) for setting a target vacuum level.

[0549] The above input unit may include a button (184) for setting the unit of vacuum level displayed on the display unit (181).

[0550] Fig. 28 is a plan view of a jig device according to another embodiment of the present invention, and Fig. 29 is a cross-sectional view showing the inside of the jig device of Fig. 28.

[0551] This embodiment is otherwise identical to the previously described embodiment, with the only notable difference being the configuration of the vacuum sensor, pressure sensor, and display. Therefore, only the distinctive features of this embodiment will be described below, and the same parts as the previously described embodiment will be referenced.

[0552] Referring to FIGS. 28 and 29, a jig device (100) according to another embodiment of the present invention may include a jig body (110), a vacuum connection (120), a low-pressure connection (130), a high-pressure connection (140), and a refrigerant injection part (170).

[0553] The above jig body (110), vacuum connection (120), low pressure connection (130), high pressure connection (140), and refrigerant injection part (170) are the same as the configuration described above.

[0554] The above jig device (100) may include a vacuum sensor (300) placed inside the jig body (110).

[0555] The vacuum sensor (300) can detect the vacuum state inside the jig body (110). The vacuum sensor (300) is placed inside the jig body (110) and can measure the vacuum level inside the jig body (110).

[0556] The vacuum sensor (300) may be coupled to the inside of the jig body (110). A part of the vacuum sensor (300) may be placed inside the jig body (110), and the remaining part of the vacuum sensor (300) may be placed outside the jig body (110).

[0557] The vacuum sensor (300) may be positioned, at least in part, on the passage (117). For example, at least in part, the vacuum sensor (300) may be inserted into the passage (117).

[0558] Specifically, a part of the vacuum sensor (300) may be placed in the second branch flow path (117c), and the remaining part of the vacuum sensor (300) may protrude outward from the second branch flow path (117c) and be exposed to the outside.

[0559] At this time, a sensor unit for detecting the vacuum level may be placed on the part of the vacuum sensor (300) placed on the second branch flow path (117c).

[0560] In addition, a display unit that displays the vacuum level measured by the sensor unit may be placed on the portion of the vacuum sensor (300) that protrudes outside the second branch flow path (117c).

[0561] The above jig device (100) may include a pressure sensor (400) placed inside the jig body (110).

[0562] The pressure sensor (400) can detect the pressure inside the jig body (110). The pressure sensor (400) is placed inside the jig body (110) and can measure the pressure value inside the jig body (110).

[0563] The pressure sensor (400) may be coupled to the inside of the jig body (110). A part of the pressure sensor (400) may be placed inside the jig body (110), and the remaining part of the pressure sensor (400) may be placed outside the jig body (110).

[0564] The above pressure sensor (400) may be placed at least partially on the above-described euro (117).

[0565] Specifically, a part of the pressure sensor (400) may be placed in the common flow path (117a), and the remaining part of the pressure sensor (400) may protrude outward from the common flow path (117a) and be exposed to the outside.

[0566] At this time, a sensor unit for detecting internal pressure may be placed on the portion of the pressure sensor (400) placed on the common flow path (117a).

[0567] Additionally, a display unit that displays the pressure value measured by the sensor unit may be placed on the portion of the pressure sensor (400) that protrudes outside of the common flow path (117a).

Claims

1. Jig body; A low-pressure connection part provided on the above jig body and connected to the low-pressure part of the refrigeration cycle; A high-pressure connection part provided in the above jig body and connected to the high-pressure part of the refrigeration cycle; A vacuum connection part provided on the above jig body and connected to a vacuum pump; and A jig device including a vacuum sensor connection part provided on the jig body and to which a vacuum sensor detecting the vacuum level inside the jig body is connected.

2. In paragraph 1, The above vacuum connection part is a jig device arranged opposite to the low pressure connection part and the high pressure connection part.

3. In paragraph 1, The above vacuum connection part is a jig device arranged opposite to the above vacuum sensor connection part.

4. In paragraph 1, The above vacuum sensor connection part is a jig device placed between the low pressure connection part and the high pressure connection part.

5. In paragraph 1, A jig device in which the outer diameter (D1) of the above vacuum connection is formed larger than the outer diameters (D2) of the low pressure connection and the high pressure connection.

6. In paragraph 1, A jig device having a vacuum line for connection to the vacuum pump provided in the above vacuum connection section.

7. In paragraph 6, A jig device having a vacuum valve provided in the above vacuum connection for restricting the flow of fluid through the vacuum line.

8. In paragraph 6, A jig device having an elastic member provided on the outer surface of the above vacuum line.

9. In paragraph 1, A jig device in which the above low-pressure connection part is provided with a low-pressure line for connection to the above low-pressure part.

10. In paragraph 9, A jig device having a low pressure valve provided at the above low pressure connection for restricting the flow of fluid through the above low pressure line.

11. In paragraph 1, A jig device having a high-pressure line for connection to the high-pressure section in the high-pressure connection section.

12. In paragraph 11, A jig device having a high pressure valve provided in the high pressure connection portion to limit the flow of fluid through the high pressure line.

13. In paragraph 1, A jig device further comprising a refrigerant injection unit provided on the above jig body and connected to a refrigerant storage unit for injecting refrigerant.

14. In paragraph 13, A jig device further comprising a pressure sensor connection part provided on the jig body and connected to a pressure sensor that detects the internal pressure of the jig body.

15. In paragraph 14, A jig device in which the refrigerant injection unit and the pressure sensor connection unit are positioned opposite each other.

16. In paragraph 14, A jig device having an auxiliary vacuum line selectively connected to the vacuum pump at the refrigerant injection unit or the pressure sensor connection unit.

17. In paragraph 1, A fluid path is formed inside the above jig body, The above euro is a jig device connected to the low pressure connection part, high pressure connection part, vacuum connection part and vacuum sensor connection part, respectively.

18. In paragraph 17, The above euro is, A common flow path extending along the length of the jig body; and A jig device comprising a branch channel extending in a direction intersecting the longitudinal direction from the common channel.

19. In paragraph 18, The above branch flow is, A first branch flow path extending in the first direction from the above common flow path; and A jig device including a second branch flow path extending in a second direction opposite to the first direction from the common flow path.

20. In paragraph 17, The above jig body is, The lower body in which a portion of the above euro is formed; and A jig device comprising an upper body formed with the remaining portion of the above euro and joined to the upper side of the lower body.

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