JP5593084B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger used in, for example, a refrigeration cycle constituting a car air conditioner.

  In this specification and claims, the top and bottom of FIG.

  In recent years, as a heat exchanger of a refrigeration cycle that constitutes a car air conditioner, for example, an interval between each other can be improved for the purpose of improving assembling to a vehicle body, saving installation space, and improving the refrigeration capacity of a refrigeration cycle. A pair of vertically extending tanks disposed at a distance from each other, and a plurality of heat exchange tubes disposed in parallel with a space in the vertical direction between both tanks and having both ends connected to both tanks, A partition having fins arranged between adjacent heat exchange tubes and a cylindrical liquid receiver attached to one of the tanks extending in the vertical direction, both tanks being provided at the same height position. The wall (partition member) is partitioned into two headers in the length direction of the tank, and a condensing part having a function as a condenser is provided in a part above the both partition walls. A subcooling part having a function as a supercooler is provided in a lower part than the refrigerant inlet, and a refrigerant inlet for sending refrigerant into the liquid receiver from the condenser part and a receiver from the liquid receiver to the supercooling part. Refrigerant outlet for delivering refrigerant is formed so that the former is positioned above, and extends in the vertical direction in the liquid receiver, and has a bottomed cylindrical refrigerant passage cylinder whose upper end is open and whose lower end is closed The cylindrical body is arranged such that the upper end is located below the refrigerant inlet and the lower end is located in the vertical middle part of the refrigerant outlet, and is received by the upper end of the outer peripheral surface of the refrigerant passage cylindrical body. A seal member that is in contact with a portion between the refrigerant inlet and the refrigerant outlet on the inner peripheral surface of the liquid container and that divides the liquid receiver vertically is provided, and the seal member is provided on the peripheral wall of the refrigerant passing tubular body. Also below the seal member in the receiver. Communication port establishing communication compartments and a tubular body for refrigerant passage are formed, the communication port is a heat exchanger that is blocked is known by the filter (see Patent Document 1).

  However, in the heat exchanger described in Patent Document 1, the gas-liquid mixed phase refrigerant that has flowed into the liquid receiver through the refrigerant inlet from the condensing part remains at a high flow rate, and the refrigerant passing cylindrical shape from the upper end opening. It may enter the body, pass through the filter at the communication port, and flow out to the supercooling section through the refrigerant outlet, and the gas-liquid separation effect of the refrigerant is not sufficient, and the refrigeration cycle using this heat exchanger There is a problem that the performance decreases.

JP2003-302126A

  The objective of this invention is providing the heat exchanger which can solve the said problem and can improve a gas-liquid separation effect.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A pair of tanks extending in the vertical direction spaced apart from each other, and a plurality of heats arranged in parallel with a space in the vertical direction between the tanks and both ends connected to both tanks. It has an exchange pipe and a vertically extending liquid receiver attached to one of the tanks, and the liquid receiver has a refrigerant inlet and a refrigerant outlet leading to the tank so that the former is positioned above. A heat exchanger formed at intervals in the vertical direction,
In the liquid receiver, there is disposed a refrigerant passage tubular body extending in the vertical direction and having an upper end located above the refrigerant inlet and a lower end located below the refrigerant inlet. The refrigerant inlet and the refrigerant At the height position between the outlet and the outer peripheral surface of the refrigerant passage tubular body and the inner peripheral surface of the liquid receiver, a seal portion is provided that divides the liquid receiver vertically. A first communication port is formed in a portion above the refrigerant inlet in the refrigerant passage cylindrical body to allow the section above the seal portion in the receiver and the refrigerant passage cylindrical body to pass through. The second communication is such that the communication port is closed by a filter, and the section below the seal portion in the liquid receiver and the section below the seal portion in the liquid receiver and the refrigerant passage cylindrical body are passed through the communication port. Mouth is formed ,
A liquid receiver having a refrigerant passage extending downward from the upper end and fixed to the tank; a tubular member having an upper end closed and a lower end opened; and the liquid receiver attached to the base member The refrigerant inlet and the refrigerant outlet are formed in the base member so that one end thereof opens into the refrigerant passage and the other end communicates with the tank. The seal portion is provided between the inner peripheral surface of the refrigerant passage of the member,
On the outer peripheral surface of the base member, a portion above the refrigerant inlet is provided with a male screw portion whose axis is directed in the vertical direction. A threaded portion is provided so that the female receiver body is removably attached to the base member by screwing the female threaded portion of the receiver body with the threaded portion of the base member,
The upper end portion of the refrigerant passing tubular body protrudes upward from the base member, and the mounting member is fixedly provided on the protruding portion, and the outer peripheral surface of the mounting member has an axial line oriented in the vertical direction. A heat exchanger in which a threaded portion of the mounting member is screwed to a portion above the threaded portion of the female threaded portion of the receiver body .

  2) The seal portion is provided on the outer peripheral surface of the refrigerant passage tubular body so as to be in contact with a portion between the refrigerant inlet and the refrigerant outlet on the inner peripheral surface of the liquid receiver. Heat exchanger.

  3) The seal portion is provided on the inner peripheral surface of the liquid receiver so as to be in contact with a portion between the refrigerant inlet and the refrigerant outlet on the outer peripheral surface of the refrigerant passage tubular body. Heat exchanger.

  4) The heat exchanger according to any one of 1) to 3) above, wherein the second communication port of the refrigerant passage tubular body is located between the refrigerant inlet and the refrigerant outlet.

  5) The heat exchange according to any one of the above 1) to 4), wherein a desiccant container containing a desiccant is disposed in a portion above the refrigerant passing tubular body in the liquid receiver. vessel.

6) The upper end of the refrigerant passage cylindrical body is closed, the lower end is opened, the first communication port is formed in the peripheral wall of the refrigerant passage cylindrical body, and the lower end opening of the refrigerant passage cylindrical body is The heat exchanger according to 5) above, wherein the second communication port is provided and the desiccant container is received by the upper end of the refrigerant passage cylindrical body.

7) The first tank to which the receiver is attached is partitioned into two headers in the length direction of the first tank by the first partition member, and the other second tank is also formed by the second partition member. Condensed into two headers in the length direction of the second tank, both partition members are in the same position in the length direction of both tanks, and have a function as a capacitor in the upper part of both partition members And a supercooling part having a function as a supercooler is provided in the lower part of both partition members, and the refrigerant flowing out from the first tank side header of the condensing part passes through the refrigerant inlet. enters receiver in the refrigerant flowing out from the refrigerant outlet of the receiver is, in any of the above 1) to 6), which flows into the first tank side of the header of the subcooling section The described heat exchanger.

According to the heat exchangers 1) to 7) above, the refrigerant that extends vertically in the liquid receiver and whose upper end is located above the refrigerant inlet and whose lower end is located below the refrigerant inlet. A liquid receiving device is disposed between the outer peripheral surface of the refrigerant passing cylindrical body and the inner peripheral surface of the liquid receiver at a height position between the refrigerant inlet and the refrigerant outlet. A seal portion that divides the inside vertically is provided, and a section above the coolant inlet in the refrigerant passage cylindrical body and a section above the seal portion in the liquid receiver and the refrigerant passage cylindrical body A first communication port is formed, and the first communication port is closed by a filter, in a portion below the seal portion in the refrigerant passage tubular body, below the seal portion in the liquid receiver. Since the second communication port is formed through the compartment and the refrigerant passage cylindrical body, When flowing from the inlet into the compartment above the seal member in the liquid receiver, the refrigerant hits the refrigerant passage tubular body and flows upward in a state where the flow velocity is reduced, and then the first communication port The refrigerant passes through the filter, enters the refrigerant passage cylindrical body, passes through the second communication port, enters the section below the seal portion in the liquid receiver, and is sent out from the refrigerant outlet. Then, since an upward flow of the gas-liquid mixed phase refrigerant having a relatively low flow rate is generated in the section above the seal portion in the liquid receiver, the bubbles made of the gas-phase refrigerant are the gas-liquid mixed phase refrigerant. It becomes easy to rise along the upward flow, and only the liquid-phase refrigerant easily passes through the filter of the first communication port and flows into the refrigerant passing tubular body. In addition, even if the liquid-phase refrigerant passing through the first communication port includes bubbles made of a gas-phase refrigerant, the bubbles are crushed by the filter, so that the gas-phase refrigerant is unlikely to flow into the refrigerant-passing tubular body. Become. Therefore, the gas-liquid separation effect in the section above the seal portion in the liquid receiver is improved, and the performance deterioration of the refrigeration cycle using this heat exchanger is prevented.

  According to the heat exchanger of 5) above, the bubbles made of the gas-phase refrigerant in the gas-liquid mixed phase refrigerant that has flowed into the section above the seal portion in the liquid receiver are less likely to enter the desiccant container. Since it becomes easy to rise along the desiccant container, the gas-liquid separation effect in the section above the seal portion in the liquid receiver is further improved.

  According to the heat exchanger of 6) above, the first communication port of the refrigerant passing tubular body is prevented from being closed by the desiccant container. Therefore, the flow of the refrigerant that has flowed from the refrigerant inlet into the compartment above the seal member in the liquid receiver to the compartment below the seal portion is not hindered.

It is a front view which shows the whole structure of the heat exchanger of 1st Embodiment of this invention. It is the vertical longitudinal cross-sectional view which abbreviate | omitted and showed the part which expanded and shows the part of the liquid receiver of the heat exchanger shown in FIG. It is a disassembled perspective view which shows the base member of the liquid receiver of the heat exchanger shown in FIG. 1, and the cylindrical body for refrigerant | coolant passage. It is a graph which shows the experimental result performed using the heat exchanger of this invention product and comparative product shown in FIG. It is a figure equivalent to FIG. 2 which shows the structure of the principal part of the heat exchanger of 2nd Embodiment of this invention. It is a disassembled perspective view which shows the base member of the liquid receiver of the heat exchanger shown in FIG. 5, and the cylindrical body for refrigerant | coolant passage.

  Embodiments of the present invention will be described below with reference to the drawings. Throughout the drawings, the same parts and the same parts are denoted by the same reference numerals, and redundant description is omitted.

  In this embodiment, the heat exchanger according to the present invention is applied to a heat exchanger in which a condensing part having a condenser function and a supercooling part having a supercooler function are integrated.

  In the following description, the left and right sides in FIG. 1 are referred to as left and right, the front side of FIG. 1 is the front side, and the opposite side is the back side. In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  FIG. 1 shows the overall configuration of the heat exchanger of the first embodiment, and FIGS. 2 and 3 show the configuration of the main part thereof.

  In FIG. 1, the heat exchanger (1) has a width between a pair of left and right aluminum tanks (2) and (3) extending in the vertical direction and spaced apart from each other, and both tanks (2) and (3). A plurality of flat aluminum heat exchange tubes (4) with their directions directed in the front-rear direction and arranged in parallel at intervals in the vertical direction, and both left and right ends connected to both tanks (2) (3), respectively And an aluminum corrugated fin (5) brazed to the heat exchange pipe (4) between the adjacent heat exchange pipes (4) and outside the heat exchange pipes (4) at both upper and lower ends, and A pair of upper and lower aluminum side plates (6) disposed outside the corrugated fin (5) and brazed to the corrugated fin (5), and a receiver (7) fixed to the left tank (2) It has.

  Both tanks (2) and (3) of the heat exchanger (1) are divided into upper and lower sections by partition walls (8) and (9) (partition members) at the same height in the lower part. A condenser (12) that functions as a condenser to condense the refrigerant into a liquid phase, and an overcool that cools the liquid refrigerant condensed in the condenser (12) to a temperature about 5 to 15 ° C. lower than the condensation temperature. A supercooling section (13) having the function of a cooler is integrally provided side by side in the same vertical plane so that the former is positioned above.

  Here, the part above the partition wall (8) in the left tank (2) is the left header (14) of the condensing part (12), and the part above the partition wall (9) in the right tank (3) Is the right header (15) of the condenser (12). Further, the part below the partition wall (8) in the left tank (2) is the left header (16) of the supercooling section (13), and the part below the partition wall (9) in the right tank (3) Is the right header (17) of the supercooling section (13).

  The right header (15) of the condensing part (12) is divided into an upper header part (15a) and a lower header by an aluminum first partition plate (18) for forming a passage group provided at a middle height position in the vertical direction. The left header (14) is divided by an aluminum second partition plate (19) for passage group formation provided at a lower position than the first partition plate (18). The upper header portion (14a) and the lower header portion (14b) are partitioned. The condensing part (12) is divided into a part above the first partition plate (18), a part between the partition plates (18) and (19), and a part below the second partition plate (19), respectively. A passage group (21), (22), (23) is provided which is composed of heat exchange pipes (4) arranged continuously in the vertical direction. The number of heat exchange pipes (4) constituting each of the passage groups (21), (22), and (23) decreases sequentially from the top. Further, the flow direction of the refrigerant in all the heat exchange pipes (4) constituting each passage group (21), (22), and (23) is the same, and two adjacent passage groups (21) (22) And the flow directions of the refrigerant in the heat exchange pipe (4) of (22) and (23) are different.

  An aluminum refrigerant inlet member (24) leading to a refrigerant inlet (not shown) is joined to the upper end portion of the upper header portion (15a) of the right header (15) of the condenser portion (12) by brazing or the like, and the supercooling portion (13 An aluminum refrigerant outlet member (25) leading to a refrigerant outlet (not shown) is joined to the right header (17) of the above by brazing or the like.

  The liquid receiver (7) includes an aluminum base member (26) fixed to the lower portion of the left tank (2) by brazing, and an aluminum liquid receiver body detachably attached to the base member (26). (27), and a bag-like desiccant container (30) containing the desiccant is contained therein.

  As shown in FIGS. 2 and 3, the base member (26) has a cylindrical shape with both upper and lower ends opened, and has a penetrating refrigerant passage (20) from its upper end to its lower end. The lower end opening of 20) is closed by a cap (31) fixed to the base member (26). The entire inner peripheral surface of the refrigerant passage (20) of the base member (26) is a cylindrical surface. Two fixing portions (28) and (29) are formed on the outer peripheral surface of the base member (26) at intervals in the vertical direction, and the upper fixing portion (28) of the condensing portion (12) in the left tank (2). It is fixed to the lower header part (14b) of the left header (14) by brazing or the like, and the lower fixing part (29) is also fixed to the left header (16) of the supercooling part (13) by brazing or the like. . The base member (26) is formed with a refrigerant inlet (32) and a refrigerant outlet (33) so that the former is positioned above. The refrigerant inlet (32) has one end opened to the inner peripheral surface of the refrigerant passage (20) of the base member (26) and the other end opened to the tip of the upper fixing part (28). The other end opening of (32) is connected to a refrigerant outlet (34) formed in the lower header part (14b) of the left header (14) of the condensing part (12). The refrigerant outlet (33) has one end opened to the inner peripheral surface of the refrigerant passage (20) of the base member (26) and the other end opened to the tip of the lower fixing portion (29). The other end opening of the outlet (33) communicates with a refrigerant inlet (36) formed in the left header (16) of the supercooling section (13). A male screw portion (37) whose axis is directed in the vertical direction is formed in a portion excluding the upper portion of the outer peripheral surface of the portion above the upper fixing portion (28) of the base member (26). The portion above the external thread portion (37) on the outer peripheral surface of the portion above the upper fixed portion (28) of the base member (26) has an outer diameter smaller than the root diameter of the external thread portion (37). An annular groove (38) is formed in the cylindrical surface, and an O-ring (39) is disposed in the annular groove (38).

  The lower end portion of the receiver body (27) is reduced in diameter over a predetermined length, and the axis is directed in the vertical direction and the base member (26 in the portion excluding the upper portion on the inner peripheral surface of the reduced diameter portion (27a). ) Is formed with a female screw portion (41) to be screwed onto the male screw portion (37). Then, the female thread portion (41) of the liquid receiver body (27) is screwed to the male thread portion (37) of the base member (26), so that the liquid receiver body (27) becomes the base member (26). It is detachably attached. The portion of the inner diameter of the reduced diameter portion (27a) of the receiver body (27) above the internal thread portion (41) is a cylindrical surface having an inner diameter smaller than the mountain diameter of the internal thread portion (41). The O-ring (39) of the base member (26) is in contact with the cylindrical surface, so that the space between the base member (26) and the liquid receiver body (27) is sealed.

  In the liquid receiver (7), it extends in the vertical direction, and the upper end is located above the refrigerant inlet (32) and the lower end is located between the refrigerant inlet (32) and the refrigerant outlet (33). A plastic refrigerant passing tubular body (42) is disposed. A plurality of support legs (43) projecting downward are integrally formed at the lower end of the refrigerant passage tubular body (42), and the support legs (43) are formed on the cap (31) of the base member (26). It is on. The refrigerant passage of the liquid receiver (7) is located at a height position between the refrigerant inlet (32) and the refrigerant outlet (33) of the base member (26) on the outer peripheral surface of the refrigerant passage cylindrical body (42). A seal member (44) (seal part) that contacts a portion between the refrigerant inlet (32) and the refrigerant outlet (33) on the inner peripheral surface of (20) and that partitions the liquid receiver (7) vertically; ) In the liquid receiver (7), the first compartment (45) facing the refrigerant inlet (32) above the seal member (44), and the seal member (44). A second section (46) facing the lower refrigerant outlet (33) is provided. The first section (45) includes a portion above the seal member (44) in the refrigerant passage (20) of the base member (26) and the inside of the liquid receiver body (27).

  The refrigerant passing tubular body (42) is closed at the upper end and opened at the lower end, and is received by a portion of the peripheral wall of the refrigerant passing tubular body (42) above the refrigerant inlet (32). A plurality of first communication ports (47) are formed through the first section (45) above the seal member (44) in the liquid vessel (7) and the inside of the refrigerant passage tubular body (42). One communication port (47) is closed by a mesh filter (48). The mesh size of the mesh filter (48) is preferably such that there are more than 100 eyes in the length of 1 inch. Further, the lower end opening of the refrigerant passage cylindrical body (42) is located in the second compartment (46) below the seal member (44) in the liquid receiver (7) and the refrigerant passage cylindrical body (42). It is the second communication port (49) that lets you go through. Therefore, the second communication port (49) of the refrigerant passage tubular body (42) is located between the refrigerant inlet (32) and the refrigerant outlet (33). A plurality of projections (40) projecting radially outward are integrally formed at the upper end of the refrigerant passing tubular body (42) at intervals in the circumferential direction.

  The desiccant container (30) is disposed in the first compartment (45) in the liquid receiver (7) and is received by the upper end of the refrigerant passing tubular body (42).

  The heat exchanger (1) constitutes a refrigeration cycle together with a compressor, an expansion valve (decompressor) and an evaporator, and is mounted on a vehicle as a car air conditioner.

  In the heat exchanger (1) described above, during operation of the refrigeration cycle, the high-temperature and high-pressure gas-liquid mixed phase refrigerant compressed by the compressor passes through the inlet member (24) from the refrigerant inlet (not shown) to the condenser (12). It flows into the upper header portion (15a) of the right header (15). The gas-liquid mixed phase refrigerant that has flowed into the upper header portion (15a) of the right header (15) passes through the heat exchange pipe (4) of the upper end passage group (21), and the upper header portion (14a) of the left header (14). ) And then into the lower header section (15b) of the right header (15) through the heat exchange pipe (4) of the intermediate path group (22) and further heat exchange of the lower end path group (23). It flows into the lower header part (14b) of the left header (14) through the pipe (4).

  The gas-liquid mixed phase refrigerant that has flowed into the lower header portion (14b) of the left header (14) of the condensing portion (12) is sent out from the refrigerant outlet (34) and is fixed to the upper fixed portion (28) of the base member (26). The refrigerant flows through the refrigerant inlet (32) and flows into the first compartment (45) in the liquid receiver (7). When the gas-liquid mixed phase refrigerant flows into the first compartment (45) in the receiver (7), the moisture is removed by the desiccant in the desiccant container (30). The gas-liquid mixed phase refrigerant that has flowed into the first section (45) passes through the filter (48) of the first communication port (47) and enters the refrigerant passage cylindrical body (42), and the second communication port ( 49) to flow into the second compartment (46). The liquid-phase refrigerant that has flowed into the second section (46) passes from the refrigerant outlet (33) through the refrigerant outlet (35) of the lower fixing portion (29) of the base member (26) to the refrigerant inlet (36 ) Flows into the left header (16) of the supercooling section (13). The refrigerant flowing into the left header (16) of the supercooling section (13) flows into the right header (17) through the heat exchange pipe (4), and passes through the refrigerant outlet member (25) from the refrigerant outlet (not shown). It is sent to the evaporator through the expansion valve.

  When flowing into the first compartment (45) in the liquid receiver (7) through the refrigerant inlet (32), the gas-liquid mixed phase refrigerant passes through the first wall on the peripheral wall of the refrigerant passage tubular body (42). Flowing upward in a state where the flow velocity is reduced by hitting a portion below the communication port (47), then passes through the filter (48) of the first communication port (47) and passes through the refrigerant passing tubular body (42 ) In the first compartment (45) in the liquid receiver (7), an upward flow of the gas-liquid mixed phase refrigerant having a relatively low flow rate is generated. It becomes easy to rise along the upward flow of the refrigerant, and only the liquid phase refrigerant easily passes through the filter (48) of the first communication port (47) and flows into the refrigerant passage cylindrical body (42). . Moreover, even if the liquid-phase refrigerant passing through the first communication port (47) contains bubbles made of gas-phase refrigerant, the bubbles are crushed by the filter (48), so the gas-phase refrigerant is stored in the refrigerant passage cylinder. It becomes difficult to flow into the body (42). Further, since the bubbles made of the gas-phase refrigerant in the gas-liquid mixed phase refrigerant are difficult to enter the desiccant container (30), they easily rise along the desiccant container (30). Therefore, the gas-liquid mixed phase refrigerant is efficiently gas-liquid separated in the first section (45).

   Next, an experimental example performed using the heat exchanger (1) having the above-described configuration (referred to as a product of the present invention) will be described together with a comparative experimental example performed using a comparative product.

  The heat exchanger used as a comparative product has the same configuration as the heat exchanger described in Patent Document 1, and a pair of tanks arranged in the vertical direction and spaced apart from each other, and the vertical direction between both tanks. A plurality of heat exchange tubes arranged in parallel at intervals and having both ends connected to both tanks, fins arranged between adjacent heat exchange tubes, and upper and lower attached to one of the tanks A tank receiver that extends in the direction of the tank, and both tanks are partitioned into two headers in the length direction of the tank by partition walls provided at the same height, respectively, and a portion above the partition walls Is provided with a condensing part having a function as a condenser, and a subcooling part having a function as a supercooler is provided below the both partition walls, and the liquid receiver receives the condenser from the condenser part. Refrigerant inflow to send refrigerant into And the refrigerant outlet for sending the refrigerant from the receiver to the supercooling part is formed so that the former is located above, and extends vertically in the receiver, with the upper end open and the lower end closed. The bottomed cylindrical refrigerant passage cylindrical body is arranged such that the upper end is positioned below the refrigerant inlet and the lower end is positioned in the middle of the refrigerant outlet in the vertical direction. A seal member that is in contact with a portion between the refrigerant inlet and the refrigerant outlet on the inner peripheral surface of the liquid receiver and that divides the liquid receiver vertically is provided at the upper end of the outer peripheral surface of the receiver. A communication port that allows the inside and outside of the refrigerant passage cylindrical body to pass through is formed in the peripheral wall of the cylindrical body, and the communication port is closed by a mesh filter.

  The size of the condenser part of the present invention and the comparative product, the number of heat exchange tubes in the condenser part, the total of the cross-sectional area of the total heat exchange pipe in the condenser part, the size of the supercooling part, the heat exchange pipe of the supercooling part The number, the total of the cross-sectional area of the total heat exchange pipe of the supercooling section, and the size of the liquid receiver are the same.

  Then, the refrigeration cycle is assembled using the product of the present invention and the comparative product, the compressor, the expansion valve, and the evaporator, respectively, and a predetermined amount of refrigerant is first put into these refrigeration cycles and the operation of the refrigeration cycle is started. Then, the charge graph was created by investigating the degree of supercooling at various refrigerant charging amounts while adding the refrigerant. The result is shown in FIG. In the charge graph shown in FIG. 4, point A is the point where supercooling of the refrigerant flowing out from the heat exchangers of the present invention and comparative products is started, and point B is the receiver of the present products and comparative products. The liquid phase refrigerant started to accumulate inside, and the point C is the point where the liquid receivers of the product of the present invention and the comparative product were filled with the liquid refrigerant. In the case of the product of the present invention, the supercooling of the refrigerant flowing out of the heat exchanger is started when the amount of refrigerant filled is smaller than that of the comparative product, so that the amount of refrigerant used in the refrigeration cycle is reduced. It becomes possible to do. In the case of the product of the present invention, the width of the steady region where the degree of supercooling is constant (the interval between the points B and C) is longer than that of the comparative product, and has sufficient performance as this type of heat exchanger. You can see that

  5 and 6 show the configuration of the main part of the heat exchanger according to the second embodiment of the present invention.

  5 and 6, the base member (50) of the liquid receiver (7) has a bottomed cylindrical shape having an upper end opened and a lower end closed, and extends downward from the upper end to reach the vicinity of the lower end. A bottom-like refrigerant passage (51) is provided. The refrigerant passage (51) of the base member (50) has a large-diameter portion whose inner peripheral surface is a cylindrical surface and extends from the upper end to a height position between the refrigerant inlet (32) and the refrigerant outlet (33) ( 51a) and a small-diameter portion (51b) whose inner peripheral surface is a cylindrical surface concentric with the inner peripheral surface of the large-diameter portion (51a) and is continuous with the lower end of the large-diameter portion (51a). One end of the refrigerant inlet (32) opens to the lower part of the inner peripheral surface of the large-diameter portion (51a) of the refrigerant passage (51), and one end of the refrigerant outlet (33) is the small-diameter portion (51b) of the refrigerant passage (51). ) At the lower end of the inner peripheral surface. Further, a male screw portion (52) whose axis is directed in the vertical direction is formed in a portion excluding the lower portion of the outer peripheral surface of the portion above the upper fixing portion (28) of the base member (50). The outer part of the outer peripheral surface of the upper part of the base member (50) above the upper fixing part (28) is lower than the external thread of the male thread part (52). An annular groove (53) is formed in the cylindrical surface, and an O-ring (54) is disposed in the annular groove (53).

  The lower end portion of the receiver body (55) is reduced in diameter over a predetermined length, and the axis is directed in the vertical direction and the base member (50 in the portion excluding the lower portion on the inner peripheral surface of the reduced diameter portion (55a). ) Is formed with a female thread portion (56) screwed to the male thread portion (52). Then, the receiver body (55) is attached to and detached from the base member (50) by screwing the female thread portion (56) of the receiver body (55) with the male thread portion (52) of the base member (50). It is attached freely. Further, the portion below the internal thread portion (56) on the inner peripheral surface of the reduced diameter portion (55a) of the liquid receiver body (55) is a cylinder having an inner diameter larger than the root diameter of the internal thread portion (56). The O-ring (54) of the base member (50) is in contact with the cylindrical surface, so that the space between the base member (50) and the liquid receiver body (55) is sealed.

  In the liquid receiver (7), it extends in the vertical direction, the upper end is located above the reduced diameter portion (55a) of the receiver body (55), and the lower ends are the refrigerant inlet (32) and the refrigerant outlet. A plastic refrigerant passing tubular body (57) positioned between (33) is disposed. The entire outer peripheral surface of the refrigerant passage cylindrical body (57) is a cylindrical surface having the same outer diameter, and the lower end of the refrigerant passage cylindrical body (57) is connected to the refrigerant passage (51) of the base member (50). The small diameter portion (51b) is closely fitted. The portion of the base member (50) that protrudes inward from the inner peripheral surface of the large-diameter portion (51a) of the refrigerant passage (51) and that forms the small-diameter portion (51b) of the refrigerant passage (51) The container (7) has a seal part (58) which is divided into upper and lower parts, whereby the refrigerant inlet (32) above the seal part (58) faces the liquid receiver (7). A first section (45) and a second section (46) facing the refrigerant outlet (33) below the seal portion (58) are provided. The first section (45) is a large diameter portion (51a) of the refrigerant passage (51) of the base member (50), that is, a portion above the seal portion (58) in the refrigerant passage (51) of the base member (50). And the interior of the receiver body (55).

  The refrigerant passage cylindrical body (57) is closed at the upper end and opened at the lower end, and is received by a portion of the peripheral wall of the refrigerant passage cylindrical body (57) above the refrigerant inlet (32). A plurality of first communication ports (59) are formed through the first section (45) above the seal portion (58) in the liquid vessel (7) and the inside of the refrigerant passage cylindrical body (57), One communication port (59) is closed by a mesh filter (61). The mesh size of the mesh filter (61) is preferably such that there are 100 or more eyes in the length of 1 inch. In addition, the lower end opening of the refrigerant passage cylindrical body (57) is located in the second compartment (46) below the seal portion (58) in the liquid receiver (7) and the refrigerant passage cylindrical body (57). It is the second communication port (62) that lets you go through. Accordingly, the second communication port (62) of the refrigerant passage tubular body (57) is located between the refrigerant inlet (32) and the refrigerant outlet (33).

The refrigerant passing tubular body (57) protrudes above the base member (50) and has a circumferential spacing in a portion located in the reduced diameter portion (55a) of the receiver body (55). An annular mounting member (64) is integrally provided via an arm portion (63) provided in the above. On the outer peripheral surface of the mounting member (64), a male thread portion (65) whose axis is directed vertically is provided, and the male thread portion (65) of the mounting member (64) is connected to the receiver body (55). The refrigerant passing tubular body (57) is liquid-received by being screwed into a portion of the female screw portion (56) above the portion of the base member (50) screwed to the male screw portion (52). It is detachably attached to the vessel body (55).

  The desiccant container (30) is disposed above the reduced diameter portion (55a) of the receiver body (55) in the first compartment (45) in the receiver (7), and is used for refrigerant passage. It is received by the upper end of the cylindrical body (57).

  In the heat exchanger according to the second embodiment, the gas-liquid mixed phase refrigerant that has flowed into the lower header portion (14b) of the left header (14) of the condensing portion (12) is sent out from the refrigerant outlet (34) to the base member. It passes through the refrigerant inlet (32) of the upper fixed part (28) of (50) and flows into the first section (45) in the liquid receiver (7). When the gas-liquid mixed phase refrigerant flows into the first compartment (45) in the receiver (7), the moisture is removed by the desiccant in the desiccant container (30). The gas-liquid mixed phase refrigerant that has flowed into the first section (45) passes through the filter (61) of the first communication port (59) and enters the refrigerant passage cylindrical body (57), and enters the second communication port ( 62) and flows into the second compartment (46). The liquid-phase refrigerant that has flowed into the second section (46) passes from the refrigerant outlet (33) through the refrigerant outlet (35) of the lower fixing portion (29) of the base member (50) to the refrigerant inlet (36 ) Flows into the left header (16) of the supercooling section (13). The refrigerant flowing into the left header (16) of the supercooling section (13) flows into the right header (17) through the heat exchange pipe (4), and passes through the refrigerant outlet member (25) from the refrigerant outlet (not shown). It is sent to the evaporator through the expansion valve.

  When flowing into the first compartment (45) in the liquid receiver (7) through the refrigerant inlet (32), the gas-liquid mixed phase refrigerant flows into the first wall on the peripheral wall of the refrigerant passage tubular body (57). Flowing upward in a state where the flow velocity is reduced by hitting a portion below the communication port (59), then passes through the filter (61) of the first communication port (59) and passes through the refrigerant passing tubular body (57 ) In the first compartment (45) in the liquid receiver (7), an upward flow of the gas-liquid mixed phase refrigerant having a relatively low flow rate is generated. It becomes easy to rise along the upward flow of the refrigerant, and only the liquid-phase refrigerant easily passes through the filter (61) of the first communication port (59) and flows into the refrigerant passage cylindrical body (57). . Moreover, even if the liquid-phase refrigerant passing through the first communication port (59) contains bubbles made of gas-phase refrigerant, the bubbles are crushed by the filter (61), so the gas-phase refrigerant is stored in the refrigerant passage cylinder. It becomes difficult to flow into the body (57). Further, since the bubbles made of the gas-phase refrigerant in the gas-liquid mixed phase refrigerant are difficult to enter the desiccant container (30), they easily rise along the desiccant container (30). Therefore, the gas-liquid mixed phase refrigerant is efficiently gas-liquid separated in the first section (45).

  The heat exchanger according to the present invention is suitably used for a refrigeration cycle constituting a car air conditioner.

(1): Heat exchanger
(2) (3): Tank
(4): Heat exchange pipe
(7): Receiver
(8) (9): Partition wall (partition member)
(12): Condensing part
(13): Supercooling section
(14): Condenser left header
(15): Condenser right header
(16): Left header of supercooling section
(17): Right header of supercooling section
(20) (51): Refrigerant passage
(26) (50): Base member
(27) (55): Receiver body
(30): Desiccant container
(32): Refrigerant inlet
(33): Refrigerant outlet
(37) (52): Male thread
(41) (56): Female thread
(42) (57): Refrigerant passage tubular body
(44): Seal member (seal part)
(45): First section above the seal member
(46): Second compartment below the seal member
(47) (59): 1st entrance
(48) (61): Filter
(49) (62): 2nd communication port
(58): Seal part
(64): Mounting member
(65): Male thread

Claims (7)

A pair of tanks extending in the vertical direction spaced apart from each other, and a plurality of heat exchange tubes arranged in parallel with a space in the vertical direction between both tanks and having both ends connected to both tanks. And a liquid receiver that is attached to one of the tanks and extends in the vertical direction. The refrigerant inlet and the refrigerant outlet that lead to the tank are installed in the liquid receiver so that the former is positioned above. A heat exchanger formed at intervals in the direction,
In the liquid receiver, there is disposed a refrigerant passage tubular body extending in the vertical direction and having an upper end located above the refrigerant inlet and a lower end located below the refrigerant inlet. The refrigerant inlet and the refrigerant At the height position between the outlet and the outer peripheral surface of the refrigerant passage tubular body and the inner peripheral surface of the liquid receiver, a seal portion is provided that divides the liquid receiver vertically. A first communication port is formed in a portion above the refrigerant inlet in the refrigerant passage cylindrical body to allow the section above the seal portion in the receiver and the refrigerant passage cylindrical body to pass through. The second communication is such that the communication port is closed by a filter, and the section below the seal portion in the liquid receiver and the section below the seal portion in the liquid receiver and the refrigerant passage cylindrical body are passed through the communication port. Mouth is formed ,
A liquid receiver having a refrigerant passage extending downward from the upper end and fixed to the tank; a tubular member having an upper end closed and a lower end opened; and the liquid receiver attached to the base member The refrigerant inlet and the refrigerant outlet are formed in the base member so that one end thereof opens into the refrigerant passage and the other end communicates with the tank. The seal portion is provided between the inner peripheral surface of the refrigerant passage of the member,
On the outer peripheral surface of the base member, a portion above the refrigerant inlet is provided with a male screw portion whose axis is directed in the vertical direction, and the axis is in the vertical direction at a portion near the lower end opening of the inner peripheral surface of the receiver body. A threaded portion is provided so that the female receiver body is removably attached to the base member by screwing the female threaded portion of the receiver body with the threaded portion of the base member,
The upper end portion of the refrigerant passing tubular body protrudes upward from the base member, and the mounting member is fixedly provided on the protruding portion, and the outer peripheral surface of the mounting member has an axial line oriented in the vertical direction. A heat exchanger in which a threaded portion of the mounting member is screwed to a portion above the threaded portion of the female threaded portion of the receiver body . The heat exchange according to claim 1, wherein the seal portion is provided on the outer peripheral surface of the refrigerant passage cylindrical body so as to contact a portion between the refrigerant inlet and the refrigerant outlet on the inner peripheral surface of the liquid receiver. vessel. The heat exchange according to claim 1, wherein the seal portion is provided on the inner peripheral surface of the liquid receiver so as to contact a portion between the refrigerant inlet and the refrigerant outlet on the outer peripheral surface of the refrigerant passage tubular body. vessel. The heat exchanger according to any one of claims 1 to 3, wherein the second communication port of the refrigerant passing tubular body is located between the refrigerant inlet and the refrigerant outlet. The heat exchanger in any one of Claims 1-4 by which the desiccant container in which the desiccant was accommodated is arrange | positioned in the part above the cylindrical body for refrigerant | coolants passage in a liquid receiver. The upper end of the refrigerant passage cylindrical body is closed, the lower end is opened, the first communication port is formed in the peripheral wall of the refrigerant passage cylindrical body, and the lower end opening of the refrigerant passage cylindrical body is the second. The heat exchanger according to claim 5, wherein the heat exchanger is a communication port, and the desiccant container is received by the upper end of the refrigerant passing tubular body. The first tank to which the liquid receiver is attached is partitioned into two headers in the length direction of the first tank by the first partition member, and the other second tank is also second by the second partition member. The tank is divided into two headers in the length direction of the tank, both partition members are in the same position in the length direction of both tanks, and a condensing part having a function as a condenser is provided above the both partition members. A supercooling unit having a function as a supercooler is also provided below the partition members, and the refrigerant flowing out from the first tank side header of the condensing unit receives liquid through the refrigerant inlet. The heat according to any one of claims 1 to 6, wherein the refrigerant entering the vessel and flowing out from the refrigerant outlet of the liquid receiver flows into the header on the first tank side of the supercooling section. Exchanger.

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