WO2007032275A1

WO2007032275A1 - Liquid receiver unit

Info

Publication number: WO2007032275A1
Application number: PCT/JP2006/317857
Authority: WO
Inventors: Masashi Kuroishi; Hiroki Ishihara
Original assignee: Daikin Industries, Ltd.
Priority date: 2005-09-13
Filing date: 2006-09-08
Publication date: 2007-03-22
Also published as: JP2007078238A; JP3928651B2

Abstract

A liquid receiver unit (40) is provided with a liquid receiver (14), refrigerant piping (41, 42, 47, 48, 49), a plug (43), service ports (44, 46), and a solenoid valve (SV-1). Open ends (41a, 42a, 47a, 48a, 49a) of the refrigerant piping (41, 42, 47, 48, 49), the plug (43), the service ports (44, 46), and the solenoid valve (SV-1) are arranged on the side reverse to the axis center (C) of the liquid receiver (14) for a virtual plane (X) parallel with the axis center (C) of the liquid receiver (14) and separated by a predetermined distance (L) from the axis center (C) so that the peripheral apparatuses are not immersed in paint when the liquid receiver (14) is immersed in paint.

Description

Specification

Receiver unit

Technical field

The present invention relates to a liquid receiver unit that has a liquid receiver, a fusing plug, and a service port, and is incorporated in a refrigerant circuit of a refrigeration apparatus.

Background art

Conventionally, a refrigeration apparatus for cooling the inside of a refrigerator or a freezer is known.

[0003] For example, Patent Document 1 discloses a refrigeration apparatus that cools the inside of a container used for maritime transportation or the like. This refrigeration apparatus includes a refrigerant circuit to which a compressor, a condenser, an expansion valve, and an evaporator are connected. In the refrigerant circuit of this refrigeration system, the refrigerant circulates to perform a vapor compression refrigeration cycle. As a result, the refrigerant flowing through the evaporator absorbs heat from the internal air and evaporates to cool the container.

[0004] The refrigerant circuit of the refrigeration apparatus is also provided with a liquid receiver between the condenser and the expansion valve. This liquid receiver is constituted by a cylindrical airtight container, in which liquid refrigerant that is excessive in the refrigerant circuit is stored.

Patent Document 1: Japanese Patent Laid-Open No. 2002-327964

Disclosure of the invention

Problems to be solved by the invention

[0005] By the way, in order to improve the workability of the refrigerant circuit of the refrigeration apparatus as described above, the liquid receiver and the peripheral device of the liquid receiver are integrated together before being installed in the refrigeration apparatus. May be configured as an instrument.

FIG. 7 shows a configuration example of a conventional liquid receiver unit. In the liquid receiver unit (80), the refrigerant inflow pipe (82) is connected to the top of the liquid receiver (81), and the refrigerant outflow pipe (83) is connected to the bottom of the liquid receiver unit (80). Furthermore, the outflow pipe (83) includes a fusing plug (84) to prevent damage to the receiver (81) due to high pressure rise, a plurality of service ports (85,85) for charging refrigerant, a solenoid valve ( 86) and a plurality of branch pipes (87, 87, 87) are attached. In this receiver unit (80), these peripheral devices are configured integrally with the receiver (81), so that this receiver unit (80) can be easily installed in the refrigeration system.

[0007] By the way, in such a liquid receiver unit (80), the liquid receiver (81) may be coated to prevent the surface of the refrigerant pipe from sticking. In particular, in the refrigeration apparatus mounted on a marine transport container as described in Patent Document 1 above, the surface of the liquid receiver (81) is easily rusted due to the influence of salt in the outdoor air. Therefore, such painting is indispensable.

[0008] As a method of coating such a receiver unit (80), soak the receiver (81) in paint accumulated in a tank, etc. It is conceivable to attach paint to the surface of 81). However, conventionally, the plug (84), service port (85), etc. are arranged on the axial center of the liquid receiver (81). There was a risk that paint would adhere to the fastening part of (85), making it difficult to replace the plug (84) or remove the nut cover of the service port (85). In addition, when the dowel is immersed, paint enters the refrigerant pipe from the open end of the inflow pipe (82) and outflow pipe (83) of the receiver unit (80) and the branch pipe (87). There was also a fear. In other words, if the receiver (81) is submerged, paint may adhere to the receiver unit (80) where no coating is required. There was a problem that caused the quality of the product to deteriorate!

[0009] For this reason, conventionally, the surface of the liquid receiver (81) is so-called “brush coating” in which a paint is applied to the refrigerant pipe with a brush or the like. However, there was a problem that it took time and effort to apply paint to the entire area of the receiver (81) by brush painting.

[0010] The present invention has been made in view of the strong point, and an object of the present invention is to perform painting work in a liquid receiver unit in which a liquid receiver, a plug, and a service port are connected by a refrigerant pipe. The aim is to ensure the quality of the receiver unit while shortening the length.

Means for solving the problem

[0011] A first invention includes a tubular liquid receiver (14), a refrigerant pipe (41, 42, 47, 48, 49) connected to the liquid receiver (14), and the refrigerant pipe ( 42) It is assumed that the receiver unit is equipped with a fusing plug (43) and a service port (44, 46) provided in 42) and is incorporated in the refrigerant circuit (10) of the refrigeration apparatus (1). And this liquid receiver unit is the open end of the refrigerant pipe (41, 42, 47, 48, 49), The fusing plug (43) and the service port (44,46) 1S Virtual plane parallel to the axis C of the liquid receiver (14) and separated from the axis C of the liquid receiver (14) by a predetermined distance L It is characterized in that it is arranged on the opposite side of the axis C of the liquid receiver (14) with respect to X.

[0012] In the first invention, the refrigerant pipe (41, 42, 47, 48, 49), the fusing plug (43), and the service port (44, 46) are integrated with the liquid receiver (14). To the receiver unit. In this liquid receiver unit, the open end of the refrigerant pipe (41, 42, 47, 48, 49), the plug (43), and the service port (44, 46) are received with respect to the virtual plane X. Located on the opposite side to the axis C of the fluid container (14). Therefore, if the liquid receiver (14) is immersed in the coating liquid so that the axial direction of the liquid receiver (14) is in a horizontal state and the liquid level of the coating liquid and the virtual plane coincide with each other, The paint can be attached to the part below the virtual plane of 14).

[0013] On the other hand, during such doweling, the open end of the refrigerant pipe (41, 42, 47, 48, 49), the plug (43), and the service port (44, 46) force virtual plane X, In other words, because it is located above the paint liquid level, the force at the open end of the refrigerant pipe (41, 42, 47, 48, 49) enters the paint or enters the above-mentioned plug (43) or service port (44, 46). The paint will not stick!

[0014] A second invention is the receiver unit of the first invention, wherein the refrigerant pipe (42) is provided with an electromagnetic valve (SV-1), and the electromagnetic valve (SV-1) is , On the same side as the open end of the cooling pipe (41, 42, 47, 48, 49), the plug (43), and the service port (44, 46) with respect to the virtual plane X It is characterized by being arranged.

[0015] In the liquid receiver unit of the second invention, an electromagnetic valve (SV-1) for opening and closing the refrigerant pipe is integrally incorporated. Here, the solenoid valve (SV-1) is virtually the same as the open end of the refrigerant pipe (41, 42, 47, 48, 49), the plug (43), and the service port (44, 46). Since it is placed on the opposite side of the axis C of the liquid receiver (14) with respect to the plane X, the solenoid valve (SV-1) can be used even if the liquid receiver (14) is immersed in the paint liquid up to the virtual plane X. The paint does not adhere to the surface.

[0016] A third invention is the first invention, wherein the opening end portion of the refrigerant pipe (41, 42, 47, 48, 49) is in the direction parallel to the virtual plane X or opposite to the virtual plane X. It is characterized by facing the side.

[0017] In the third invention, when the liquid receiver (14) is immersed in the paint liquid up to the virtual plane X, the open end of the refrigerant pipe (41, 42, 47, 48, 49) is the liquid of the paint liquid. In a direction parallel to the surface or facing upward Become. In other words, when the liquid receiver (14) is immersed, the open end of the refrigerant pipe (41, 42, 47, 48, 49) will not face downward (the liquid level side of the coating liquid). It is possible to prevent the paint splashed when dripping from entering the refrigerant pipe (41, 42, 47, 48, 49) from the open end.

The invention's effect

[0018] In the present invention, the open end of the refrigerant pipe (41, 42, 47, 48, 49), the plug (43), and the service port (with respect to the virtual plane X of the liquid receiver (14)) 44, 46) are arranged on the opposite side of the center C of the receiver (14). For this reason, when the receiver (14) is immersed in the paint, the paint can be prevented from entering the pipe from the open end of the refrigerant pipe (41, 42, 47, 48, 49). It is possible to prevent paint from adhering to the fastening part of the filler plug (43) and service port (44, 46). Therefore, it is possible to reduce the time required for the painting operation of the liquid receiver unit while ensuring the quality of the liquid receiver unit.

[0019] Further, according to the second aspect of the invention, when the liquid receiver (14) of the liquid receiver unit in which the electromagnetic valve (SV-1) is incorporated, the electromagnetic valve (SV-1) It is possible to prevent the paint from adhering to the surface. Therefore, it is possible to avoid the occurrence of problems in the opening / closing operation of the solenoid valve (SV-1), and to ensure the quality of this liquid receiver unit.

[0020] Further, according to the third aspect of the invention, it is possible to avoid the paint scattered during the dowel immersion from entering the opening end force pipe of the refrigerant pipe (41, 42, 47, 48, 49). Thus, the quality of the liquid receiver unit can be ensured more reliably.

Brief Description of Drawings

FIG. 1 is an external view of a refrigeration apparatus and a container to which a liquid receiver unit of the present embodiment is applied.

FIG. 2 is a schematic configuration diagram of the refrigeration apparatus viewed from the front.

FIG. 3 is a piping system diagram showing a schematic configuration of a refrigerant circuit of a refrigeration apparatus.

[Fig. 4] Fig. 4 is a perspective view of the liquid receiver unit installed in the container body.

FIG. 5 is a plan view of a state in which the receiver unit is viewed from the lower side, or a state in which the receiver unit is immersed in the coating liquid.

[Fig. 6] Fig. 6 is a piping system diagram showing a refrigerant flow during refrigeration operation of the refrigeration apparatus. FIG. 7 is a perspective view of a conventional liquid receiver unit.

Explanation of symbols

[0022] 1 Refrigeration equipment

10 Refrigerant circuit

14 Receiver

40 Receiver unit

41 Inflow pipe (refrigerant pipe)

42 Outflow pipe (refrigerant pipe)

43 Plug

44,46 service port

47 Inlet piping (refrigerant piping)

48 Outflow side piping (refrigerant piping)

49 Branch pipe (refrigerant pipe)

SV-1 1st solenoid valve (solenoid valve)

X virtual plane

C axis

L distance

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0024] The liquid receiver unit (40) of the present embodiment is incorporated in the refrigerant circuit (10) of the refrigeration apparatus (1) for cooling the interior of a container used for marine transportation.

[0025] Overall configuration of refrigeration system>

As shown in FIG. 1, the refrigeration apparatus (1) is attached to the opening (3) on the front surface of the container body (2) in which stored items are refrigerated and frozen. The refrigeration apparatus (1) includes a flat casing (11) at the front and rear. The inside of the casing (11) is partitioned into a space facing the outside (outside the store) and a space facing the inside of the container body (2) (in the store).

[0026] As shown in FIG. 2, on the outside of the casing (11), as a main device, a compressor (12), A condenser (13), a liquid receiver (14), and an external fan (18) are installed. On the other hand, an evaporator (16) and an internal fan (19) are installed as main equipment inside the casing (11).

[0027] Configuration of Refrigerant Circuit>

The refrigeration apparatus (1) includes a refrigerant circuit (10) that performs a vapor compression refrigeration cycle by circulating refrigerant. The refrigerant circuit (10) is connected to the compressor (12), the condenser (13), the receiver (14), the electronic expansion valve (15), and the evaporator (16). .

[0028] The compressor (12) is a fixed-capacity scroll compressor in which the rotation speed of the compressor motor is constant. The condenser (13) constitutes a so-called air-cooled condenser that exchanges heat between the outdoor air blown by the outdoor fan (18) and the refrigerant. The liquid receiver (14) is formed of a cylindrical sealed container and stores excess liquid refrigerant in the refrigerant circuit (10). The liquid receiver (14) constitutes a part of a liquid receiver unit (40) described later in detail. The electronic expansion valve (15) is configured such that the opening degree can be adjusted according to the degree of refrigerant superheat of the evaporator (16). The evaporator (16) constitutes a heat exchanger for cooling the inside which exchanges heat between the inside air blown by the inside fan (19) and the refrigerant.

[0029] The refrigerant circuit (10) also includes double pipe heat exchange (21), ヱ conomizer heat exchange (22), reheat coil (23), drain pan heater (24), and suction proportional valve (25). Is provided.

[0030] The double pipe heat exchanger (21) exchanges heat between the refrigerant flowing through the first refrigerant channel (21a) and the refrigerant flowing through the second refrigerant channel (21b). The first refrigerant flow path (21a) has an inflow side connected to the receiver (14), and an outflow side connected to the high pressure side of the economizer heat exchanger (22) via the first solenoid valve (SV-1). Connected to the inflow end of the channel (22a). On the other hand, the second refrigerant flow path (21 b) is connected at its inflow side to the outflow end of the low pressure side flow path (22b) of the economizer heat exchanger (22), and its outflow side is compressed by the compressor (12). It is connected to a path in the middle of refrigerant compression in the mechanism.

[0031] The economizer heat exchanger (22) exchanges heat between the refrigerant flowing through the high-pressure channel (22a) and the refrigerant flowing through the low-pressure channel (22b). The outflow side of the high-pressure channel (22a) is connected to the electronic expansion valve (15). On the other hand, the inflow side of the low-pressure channel (22b) is connected to the double pipe via the first capillary tube (CT-1) and the second solenoid valve (SV-2). Connect / connect between tube heat exchanger (21) and solenoid valve (SV-1).

[0032] The reheat coil (23) is installed inside the warehouse and constitutes a reheat heat exchanger for heating the air cooled by the evaporator (16) with a refrigerant. The reheat coil (23) is provided in a reheat pipe (31) having one end connected to the discharge side of the compressor (12) and the other end connected between the electronic expansion valve (15) and the evaporator (16). It has been. The reheat pipe (31) is provided with a third solenoid valve (SV-3) on the inflow side of the reheat coil (23) and a second capillary tube (CT-2) on the outflow side thereof. Yes. When the third solenoid valve (SV-3) is opened, the refrigerant discharged from the compressor (12) flows through the reheat coil (23) via the reheat pipe (31). As a result, the internal air cooled by the evaporator (16) is heated by the refrigerant flowing in the reheat coil (23). In other words, the reheat coil (23), when dehumidifying the internal air by dehydrating the moisture in the internal air with the evaporator (16), heats the internal air that has been cooled too much to reduce the humidity of the internal air. Keep temperature optimal. The refrigerant condensed in the reheat coil (23) is depressurized in the second capillary tube (CT-2) and then flows into the evaporator (16).

[0033] The drain pan heater (24) is disposed inside a drain pan (not shown) that collects frost and ice blocks that have peeled off the evaporator (16), and heats the ice blocks in the drain pan with a refrigerant. For melting. This drain pan heater (24) has one end connected to the discharge side of the compressor (12) and the other end connected between the electronic expansion valve (15) and the evaporator (16). Is provided. The drain pan heating pipe (32) is provided with a fourth solenoid valve (SV-4) on the inflow side of the drain pan heater (24). When the fourth solenoid valve (SV-4) is opened, the refrigerant discharged from the compressor (12) flows through the drain pan heater (24) via the drain pan heating pipe (32). As a result, the ice blocks collected in the drain pan are heated and melted by the refrigerant flowing in the drain pan heater (32).

[0034] The suction proportional valve (25) is provided on the suction side of the compressor (12). The suction proportional valve (25) constitutes a flow rate adjusting valve that adjusts the refrigerant circulation amount in the refrigerant circuit (10) by adjusting the amount of refrigerant sucked by the compressor (12). That is, the suction proportional valve (25) adjusts the cooling capacity of the evaporator (16) by adjusting the refrigerant circulation amount according to the opening degree.

[0035] The refrigerant circuit (10) includes a liquid injection pipe (33), a defrost pipe (34), and a discharge gas bar. A bypass pipe (35) is provided.

The liquid injection pipe (33) is a so-called liquid injection pipe that returns the liquid refrigerant flowing out of the liquid receiver (14) to the suction side of the compressor (12). One end of the liquid injection pipe (33) is connected between the double pipe heat exchanger (21) and the second solenoid valve (SV-2), and the other end is connected to the suction side of the compressor (12). ing. The liquid injection pipe (33) is provided with a fifth solenoid valve (SV-5) and a third capillary tube (CT-3).

[0037] The defrost pipe (34) is a defrost pipe for heating and melting the frost adhering to the evaporator (16) with the refrigerant discharged from the compressor (12). The defrost pipe (34) has one end connected to the suction side of the compressor (12) and the other end connected between the electronic expansion valve (15) and the evaporator (16). The defrost pipe (34) is provided with a sixth solenoid valve (SV-6) that is opened when the defrost operation is performed to defrost the evaporator (16).

[0038] The discharge gas bypass pipe (35) is used for returning the refrigerant discharged from the compressor (12) to the suction side of the compressor (12) when the cooling capacity of the evaporator (16) becomes excessive. It is piping. The discharge gas bypass pipe (35) also serves as an oil return pipe for returning the refrigeration oil in the refrigerant discharged from the compressor (12) to the suction side of the compressor (12). The discharge gas bypass pipe (35) has one end connected to the drain pan heating pipe (32) and the other end connected to the suction side of the compressor (12). The discharge gas bypass pipe (35) is provided with a seventh solenoid valve (SV-7) that is appropriately opened according to operating conditions.

[0039] Configuration of the liquid receiver unit>

As shown in FIG. 3, the refrigerant circuit (10) incorporates a liquid receiver unit (40) including the liquid receiver (14) described above. As shown in FIG. 4, the liquid receiver unit (40) includes the above-described liquid receiver (14), and an inflow pipe (41) and an outflow pipe (42) of the liquid receiver (14). . In a state where the receiver unit (40) is installed in the casing (11), the inlet pipe (41) is connected to the top of the receiver (14), while the outlet pipe (42) is received by the receiver (14). Connected to the bottom of the liquid container (14)

[0040] Specifically, as shown in Fig. 4, the inflow pipe (41) is bent from the top of the liquid receiver (14) and extends to the front side of the liquid receiver (14). On the other hand, the outflow pipe (42) extends from the bottom of the liquid receiver (14) to the front side of the liquid receiver (14), and then curves to the back so as to be bent in a V shape. ing. Thereafter, the outflow pipe (42) extends in parallel and upward with the liquid receiver (14), then bends further forward, and then extends downward in parallel with the liquid receiver (14). Further, the subsequent outflow pipe (42) extends rightward in FIG. 4 and is bent upward again at the front side of the liquid receiver (14).

[0041] The outflow pipe (42) includes, in order from the upstream side to the downstream side, the fusing plug (43), the first service port (44), the filter (45), and the double pipe heat exchanger ( 21), the first solenoid valve (SV-1), and the second service port (46) are provided. When the refrigerant temperature rises as the refrigerant pressure in the refrigerant circuit (10) rises abnormally, the fusing plug (43) melts itself and discharges the refrigerant to the outside of the refrigerant circuit (10). (14) Prevents accidental damage to refrigerant piping. The first and second service ports (44, 46) constitute a refrigerant charging port in the refrigerant circuit (10), and nut lids (44a, 46a) are fastened to end portions thereof. The filter (45) is housed in a pipe whose diameter has been expanded in the outflow pipe (42), and removes foreign substances and the like in the refrigerant.

[0042] Further, the double pipe heat exchanger (21) includes an inflow side pipe (47) of the second refrigerant flow path (21b) and an outflow side pipe (47) of the second refrigerant flow path (21b). 48) is connected. In addition, in the outflow pipe (42), the low pressure side flow path (of the economizer heat exchanger (22) (see FIG. 1) between the double pipe heat exchanger (21) and the first solenoid valve (SV-1). 22b) The branch pipe (49) connected to the side is connected! The receiver unit (40) having the above-described configuration includes the open end (41a) of the inflow pipe (41), the open end (42a) of the outflow pipe (42), and the inflow side pipe (47). The open end (47a), the open end (48a) of the outflow side pipe (48), and the open end (49a) of the branch pipe (49) are connected to the corresponding refrigerant pipes. The refrigerant circuit (10) described above is configured (see FIG. 3).

[0043] Further, as a feature of the present invention, in the liquid receiver unit (40), each peripheral device connected to the liquid receiver (14) is arranged on the same side with respect to the liquid receiver (14). ing. Specifically, as shown in FIG. 5, a virtual plane X parallel to the axis C of the liquid receiver (14) and separated from the axis C of the liquid receiver (14) by a predetermined distance L is used as a reference. when viewed as, the inflow pipe (41), the outflow pipe (42), the inflow side pipe (47), the outflow side pipe (48), and the open end of the branch pipe (49) (41a, 42 _a, 47a , 48a, 49a) are opposite to the axis C of the receiver (14) with respect to the virtual plane X, that is, in FIG. It is placed above the virtual plane X.

On the other hand, as shown in FIG. 4, when the receiver unit (40) is installed in the casing (11), the open end of each refrigerant pipe (41, 42, 47, 48, 49). The parts (41a, 42a, 47a, 48a, 49a) are respectively positioned closer to the front side of the casing (11). For this reason, the pipe connection work of each refrigerant pipe (41, 42, 47, 48, 49) becomes relatively easy.

[0045] Further, the fusing plug (43), the first service port (44), the second service port (46), and the first solenoid valve (SV-1) also receive the liquid with respect to the virtual plane X. It is arranged on the opposite side to the axis C of (14). On the other hand, as shown in FIG. 4, when the receiver unit (40) is installed in the casing (11), these peripheral devices (43, 44, 46, SV-1) are respectively connected to the casing (11 It will be located in front of). This makes it relatively easy to replace the melt plug (43) and to fill the refrigerant with the service port (44, 46) force.

[0046] The open end (41a) of the inflow pipe (41) faces away from the virtual plane X (upper side in FIG. 5), while the remaining refrigerant pipes (42, 47). , 48, 49) each open end (42a, 47a, 48a, 49a) faces in a direction parallel to the virtual plane X (paper surface direction in FIG. 5).

On the other hand, as shown in FIG. 4, when the receiver unit (40) is installed in the casing (11), the open end (41a) of the inflow pipe (41) is connected to the casing (11 ) And the open ends (42a, 47a, 48a, 49a) of the remaining pipes (42, 47, 48, 49) are directed upward. These upwardly opening pipes (42, 47, 48, 49) are connected to the lower end openings of the other pipes located above by so-called downward brazing. Thus, the quality of the refrigerant circuit (10) can be improved.

[0048] Ku liquid receiver unit painting process>

By the way, when the receiver unit (40) is incorporated into the refrigerant circuit (10) and used as a container refrigeration unit (1), the surface of the receiver unit (40) becomes glazed with long-term use.しまう may end up. In particular, when this container is used for marine transportation, the outdoor air is likely to contain salt, so that corrosion of the surface of the receiver unit (40) is promoted. Therefore, the liquid receiver unit (40) of the present embodiment is subjected to surface coating at a stage before being incorporated into the refrigerant circuit (10).

[0049] In the coating process of the receiver unit (40), first, the receiver (14) is immersed in the coating liquid. Loose dowel immersion is performed. As shown in FIG. 5, when dripping, the axis C of the liquid receiver (14) is parallel to the liquid surface of the coating liquid, and the liquid is received from the lower side of the virtual plane X (the liquid receiver side). Immerse the liquid container (14) in the paint liquid so that the virtual plane X and the liquid level of the paint liquid match. In this state, when the liquid receiver unit (40) is pulled up from the coating liquid, the paint adheres to the lower part of the virtual plane X in the liquid receiver (14). On the other hand, at the time of soaking, the open ends (41a, 42a, 47a, 48a, 49a) of each refrigerant pipe (41, 4 2, 47, 48, 49) and peripheral devices (43, 44, 46, SV) -1) is located above the imaginary plane X, so the coating liquid can be applied to each open end (41a, 42a, 47a, 48a, 49a) and peripheral devices (43, 44, 46, SV). -1) will not adhere.

[0050] Further, when the dowel is immersed, the open end (41a) of the inflow pipe (41) is directed to the opposite side of the coating liquid surface, and the open end of the remaining pipes (42, 47, 48, 49). (42a, 47a, 48a, 49a) faces in a direction parallel to the paint liquid surface, so that the scattered paint does not adhere to the piping (41, 42, 47, 48, 49). Is done.

[0051] After the soaking, the necessary part of the receiver unit (40) is painted by brush painting. This brush coating is mainly applied to the outer peripheral surface of each refrigerant pipe. On the other hand, if paint is applied to the plug (43) or the nut lid (44a, 46a) of each service port (44, 46), the plug (43) can be replaced or each nut lid (44a, 46a) can be removed. Since it becomes difficult, brush painting is not performed on these parts.

[0052] Driving action

The refrigeration apparatus (1) can be refrigerated for refrigerated storage in the container body (2) and refrigeration for freezing these storage. Here, the refrigeration operation of the refrigeration apparatus (1) will be described with reference to FIG.

[0053] During the refrigeration operation, the compressor (12), the external fan (18), and the internal fan (19) are operated, and the opening degree of the electronic expansion valve (15) and the suction proportional valve (25) is set appropriately. Adjusted. During refrigeration operation, the first solenoid valve (SV-1) and the second solenoid valve (SV-2) are opened at the same time as the sixth solenoid valve (SV-6) is closed. The solenoid valves (SV-3, SV-4, SV-5, SV-7) are opened and closed appropriately according to the operating conditions.

[0054] The discharged refrigerant compressed by the compressor (12) first flows into the condenser (13). In the condenser (13), the refrigerant dissipates heat to the outdoor air and condenses. Thereafter, the refrigerant passes through the liquid receiver (14) and then flows into the first refrigerant flow path (21a) of the double pipe heat exchanger (21). Double tube heat exchanger (21 ), The refrigerant flowing through the first refrigerant flow path (21a) dissipates heat to the refrigerant flowing through the second refrigerant flow path (21b) described later and is cooled. That is, in the double pipe heat exchanger (21), the refrigerant flowing through the first refrigerant channel (21a) is supercooled.

[0055] A part of the refrigerant flowing out of the double-pipe heat exchanger (21) flows into the high-pressure side flow path (22a) of the economizer heat exchanger (22), while the rest flows through the first capillary tube (CT The pressure is reduced at -1) and flows into the low pressure side flow path (22b) of the heat exchanger ^^ (22). In the economizer heat exchanger (22), the refrigerant flowing through the high-pressure channel (22a) is cooled by releasing heat into the refrigerant flowing through the low-pressure channel (22b). That is, in the economizer heat exchanger (22), the refrigerant flowing through the high pressure side flow path (22a) is further subcooled. The refrigerant flowing out of the low pressure side flow path (22b) evaporates in the second refrigerant flow path (21b) of the double pipe heat exchanger (21) described above, and then is compressed in the compression mechanism of the compressor (12). Returned to the route.

[0056] The refrigerant that has flowed out of the high-pressure channel (22a) of the economizer heat exchanger (22) is reduced in pressure when passing through the electronic expansion valve (15), and the force also flows into the evaporator (16). In the evaporator (16), the refrigerant absorbs heat from the internal air and evaporates. As a result, the inside of the container body (2) is cooled. The refrigerant evaporated in the evaporator (16) passes through the suction proportional valve (25) and is then sucked into the compressor (12).

[0057] Effects of one embodiment

In the above embodiment, the open ends (41a, 42a, 47a, 48a, 49a) of the refrigerant pipes (41, 42, 47, 48, 49), the melt plane with respect to the virtual plane X of the liquid receiver (14). The stopper (43), service port (44, 46), and electromagnetic valve (SV-1) are arranged on the opposite side of the axis C of the liquid receiver (14). For this reason, the receiver (14) can be immersed in the paint to allow the paint to adhere to the periphery of the receiver (14) in a short time, while each refrigerant pipe (41, 42, 47, 48, 49 ) Can be prevented from entering the refrigerant pipe from the open end (41a, 42a, 47a, 48a, 49a). In addition, it is possible to avoid paint from adhering to the fastening parts of the above-mentioned plug (43) and service ports (44, 46) and the solenoid valve (SV-1) when immersed in the dowel. It is possible to prevent the replacement of the nut and the removal of the nut lid (44a, 46a) of the service port (44, 46) or the malfunction of the solenoid valve (SV-1). Therefore, the time required for the painting operation of the liquid receiver unit (40) can be shortened, and the quality of the liquid receiver unit (40) can be ensured. [0058] In the above embodiment, the open ends (41a, 42a, 47a, 48a, 49a) of the refrigerant pipes (41, 42, 47, 48, 49) are opposite to the virtual plane X, or since the facing virtual plane parallel to the direction, when Dobo pickled liquid receiver (14), each open end is scattered paint _{(41a, 42 a, 47a,} 48 a, 49a) force refrigerant pipe It is possible to more surely prevent entering into the interior. Therefore, the quality of the receiver unit (40) can be ensured more reliably.

[0059] The above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

Industrial applicability

[0060] As described above, the present invention is useful for a liquid receiver unit that has a liquid receiver, a fusing plug, and a service port and is incorporated in a refrigerant circuit of a refrigeration apparatus.

Claims

The scope of the claims

[1] A liquid receiver unit that includes a cylindrical liquid receiver, a refrigerant pipe connected to the liquid receiver, a plug and a service port provided in the refrigerant pipe, and is incorporated in a refrigerant circuit of a refrigeration apparatus Because

The opening end of the refrigerant pipe, the fusing plug, and the service port are the center of the liquid receiver

The liquid receiver is disposed on the opposite side to the axis C of the liquid receiver with respect to a virtual plane X that is parallel to C and separated from the axial center C of the liquid receiver by a predetermined distance L. Unit.

[2] In claim 1,

The refrigerant pipe is provided with a solenoid valve,

The receiver unit, wherein the solenoid valve is disposed on the same side as the open end of the refrigerant pipe, the melt plug, and the service port with respect to the virtual plane X.

[3] In claim 1,

The liquid receiver unit, wherein an opening end of the refrigerant pipe faces in a direction parallel to the virtual plane X or in a direction opposite to the virtual plane X.