JP2009030931A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of preventing come-out of a plug in demounting a plug of a liquid receiver from a cylindrical body. <P>SOLUTION: A female-side seal face 33 and a female screw 32 communicated with an inner part of the female-side seal face 33 are disposed on an inner peripheral face of the cylindrical body 26 of the liquid receiver 7 of this heat exchanger. A male-side seal face 35 and a male screw 34 communicated with an inner part of the male-side seal face 35 are disposed on an outer peripheral face of the plug 28 of the liquid receiver 7. An inner diameter of the female-side seal face 33 is larger than an inner diameter of the female screw 32, and an outer diameter of the male-side seal face 35 is larger than an outer diameter of the male screw 36. A part between the female-side seal face 33 and the male-side seal face 35 is sealed by an O-ring 37. A through hole 39 is formed on a peripheral wall 38a of a recessed portion 38 formed on the plug 28. A distance L1 between an outer end of the female-side seal face 33 and the O-ring 37, and a distance L2 between an outer end of the through hole 39 and an outer end of the female screw 32 are shorter than a distance L3 between an inner end of a male screw 34 and the outer end of the female screw 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

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, It is equipped with fins arranged between adjacent heat exchange pipes and a liquid receiver that extends in the vertical direction attached to one of the tanks, and both tanks are separated by a partition wall provided at the same height position. The tank is divided 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, and a part below the both partition walls. Subcooling portion is widely known heat exchanger provided with a function as a subcooler in.

  In the heat exchanger mentioned above, it is necessary to exchange the desiccant etc. which are arrange | positioned in a liquid receiver, for example, the heat exchanger of patent document 1 is known. A liquid receiver for a heat exchanger described in Patent Document 1 has a cylindrical main body extending in the vertical direction and having at least a lower end opened, and a plug screwed into the lower end of the cylindrical main body. A cylindrical female seal surface is provided on the inner peripheral surface of the lower end portion, and a female screw is provided on a portion of the inner peripheral surface of the lower end portion of the cylindrical main body that extends above the female seal surface. A male screw that is screwed onto the female screw is provided on the outer peripheral surface of the plug, and a male-side sealing surface having a cylindrical surface is provided on a portion of the outer peripheral surface of the plug that is continuous with the male screw. The inner diameter of the sealing surface is larger than the inner diameter of the female thread, the outer diameter of the male sealing surface of the plug is larger than the outer diameter of the male thread, and the female sealing surface of the cylindrical body and the male sealing surface of the plug The space between the upper and lower O-rings A heat exchanger in which the distance between the lower end of the female sealing surface of the cylindrical body and the upper O-ring is longer than the distance between the upper end of the male thread of the plug and the lower end of the female thread of the cylindrical body. It is known (see Patent Document 1).

However, in the receiver of the heat exchanger described in Patent Document 1, the distance between the lower end (outer end) of the female sealing surface of the cylindrical body and the upper O-ring is the upper end (inner end) of the male thread of the plug. And the lower end (outer end) of the female thread of the cylindrical body, the plug is removed from the cylindrical body while the refrigerant remains in the refrigeration cycle, that is, in the heat exchanger and the internal pressure is high. The following problems occur when removing. That is, when the plug is removed from the cylindrical main body, the upper O-ring seals the gap between the female-side seal surface and the male-side seal surface when the plug is turned and the screw-fitting of the female screw and the male screw is released. As a result, the refrigerant remains in the heat exchanger and the internal pressure remains high, so the plug jumps out vigorously due to the pressure in the heat exchanger.
JP-A-9-324962

  An object of the present invention is to provide a heat exchanger that solves the above problems and can prevent the plug from popping out when the plug of the liquid receiver is removed from the cylindrical body.

  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 is provided with an exchange pipe, fins arranged between adjacent heat exchange pipes, and a liquid receiver attached to one of the tanks. The liquid receiver extends in the vertical direction and at least one end is open. In a heat exchanger having a tubular body, and a plug screwed into the open end of the tubular body,
A cylindrical female seal surface is provided on the inner peripheral surface of the opening end of the cylindrical main body, and the inner peripheral surface of the opening end of the cylindrical main body is connected to the inner side of the female sealing surface. A screw is provided, and a male-side sealing surface having a cylindrical surface is provided at the outer end of the outer peripheral surface of the plug, and the female screw is screwed onto a portion of the outer peripheral surface of the plug that is continuous with the inner side of the male-side sealing surface. The internal diameter of the female seal surface of the cylindrical body is larger than the internal diameter of the female thread, and the external diameter of the male seal surface of the plug is larger than the external diameter of the external thread. The female sealing surface of the plug and the male sealing surface of the plug are sealed by an O-ring to form a recessed portion recessed outward from the inner end surface of the plug, and a screw on the outer peripheral surface of the peripheral wall of the recessed portion. At least a portion is provided and the plug is recessed. A refrigerant vent passage is formed in the portion of the peripheral wall of the peripheral wall where the male screw is provided, and when the outer end of the refrigerant vent passage comes outside the internal thread of the cylindrical main body, the inside and outside of the liquid receiver are passed through. The distance between the outer end of the female sealing surface of the cylindrical body and the O-ring, and the distance between the outer end of the refrigerant discharge passage of the plug and the outer end of the female thread of the cylindrical body are determined by the male thread of the plug. The heat exchanger is shorter than the distance between the inner end of the tube and the outer end of the internal thread of the cylindrical body.

  2) The heat exchanger according to 1) above, wherein the refrigerant vent passage is a through hole formed in the peripheral wall of the recessed portion of the plug.

  3) The heat exchanger according to 1) above, wherein the refrigerant vent passage is formed by a notch formed in the peripheral wall of the recessed portion of the plug from the inner end.

4) 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 is provided with an exchange pipe, fins arranged between adjacent heat exchange pipes, and a liquid receiver attached to one of the tanks. The liquid receiver extends in the vertical direction and at least one end is open. In a heat exchanger having a tubular body, and a plug screwed into the open end of the tubular body,
A cylindrical female seal surface is provided on the inner peripheral surface of the opening end of the cylindrical main body, and the inner peripheral surface of the opening end of the cylindrical main body is connected to the inner side of the female sealing surface. A screw is provided, and a male-side sealing surface having a cylindrical surface is provided at the outer end of the outer peripheral surface of the plug, and the female screw is screwed onto a portion of the outer peripheral surface of the plug that is continuous with the inner side of the male-side sealing surface. The internal diameter of the female seal surface of the cylindrical body is larger than the internal diameter of the female thread, and the external diameter of the male seal surface of the plug is larger than the external diameter of the external thread. Between the female side sealing surface of the plug and the male side sealing surface of the plug is sealed by an O-ring, and the plug is formed with a concave portion recessed outward from the inner end surface thereof, and the male side seal is formed on the outer peripheral surface of the peripheral wall of the concave portion. At least part of the surface is provided with a plug A through hole for extracting a refrigerant is formed in a portion of the peripheral wall of the recessed portion where the male side sealing surface is provided and inside the O-ring, and the outer end of the female side sealing surface of the cylindrical body and the through hole for extracting the refrigerant A heat exchanger in which the distance to the hole is shorter than the distance between the inner end of the male screw of the plug and the outer end of the female screw of the cylindrical body.

5) 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 is provided with an exchange pipe, fins arranged between adjacent heat exchange pipes, and a liquid receiver attached to one of the tanks. The liquid receiver extends in the vertical direction and at least one end is open. In a heat exchanger having a tubular body, and a plug screwed into the open end of the tubular body,
A female thread is provided on the inner peripheral surface of the opening end of the cylindrical main body, and a cylindrical female seal surface is formed on the inner peripheral surface of the opening end of the cylindrical main body and connected to the inner side of the female thread. A male screw is provided at the outer end of the outer peripheral surface of the plug and is screwed with the female screw. A cylindrical male seal surface is formed on the outer peripheral surface of the plug and connected to the inner side of the male screw. Provided, the inner diameter of the female sealing surface of the cylindrical body is smaller than the inner diameter of the female thread, and the outer diameter of the male sealing surface of the plug is smaller than the outer diameter of the male thread. When the O-ring comes to the outside of the female-side seal surface at the portion where the female thread of the cylindrical body is provided with a seal between the surface and the male-side seal surface of the plug. A refrigerant vent passage is formed through the inside and outside of the tube, and the female side seat of the tubular body is formed. Distance from the outer end surface until the O-ring, the heat exchanger is shorter than the distance between the outer end of the internal thread of the inner end and the tubular body of the plug of the external thread.

  6) The heat exchanger according to 5) above, wherein the refrigerant vent passage is a through hole formed in a portion of the peripheral wall of the cylindrical main body where the female screw is provided.

  7) The heat exchanger according to 5) above, wherein the refrigerant vent passage is formed of a concave groove extending in the vertical direction formed in a portion provided with a female screw on the inner peripheral surface of the peripheral wall of the cylindrical main body.

8) 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 both tanks and both ends connected to both tanks. It is provided with an exchange pipe, fins arranged between adjacent heat exchange pipes, and a liquid receiver attached to one of the tanks. The liquid receiver extends in the vertical direction and at least one end is open. In a heat exchanger having a tubular body, and a plug screwed into the open end of the tubular body,
A female thread is provided on the inner peripheral surface of the opening end of the cylindrical main body, and a cylindrical female seal surface is formed on the inner peripheral surface of the opening end of the cylindrical main body and connected to the inner side of the female thread. A male screw is provided at the outer end of the outer peripheral surface of the plug and is screwed with the female screw. A cylindrical male seal surface is formed on the outer peripheral surface of the plug and connected to the inner side of the male screw. Provided, the inner diameter of the female sealing surface of the cylindrical body is smaller than the inner diameter of the female thread, and the outer diameter of the male sealing surface of the plug is smaller than the outer diameter of the male thread. When the O-ring comes to the outside of the female-side seal surface in the portion where the male thread is sealed between the surface and the male-side seal surface of the plug and the external thread on the outer peripheral surface of the plug is provided A groove for draining the coolant that passes through the inside and outside of the vessel is formed, Distance from the outer end of the side sealing surface to O-ring, the heat exchanger is shorter than the distance between the outer end of the internal thread of the inner end and the tubular body of the plug of the external thread.

  According to the heat exchanger of the above 1), the plug is formed with a recessed portion that is recessed outward from the inner end surface thereof, and at least a part of the screw is provided on the outer peripheral surface of the peripheral wall of the recessed portion. A refrigerant vent passage is formed in the portion of the peripheral wall of the portion where the male screw is provided, and when the outer end of the refrigerant vent passage comes outside the female thread of the cylindrical body, the inside and outside of the liquid receiver are passed through. The distance between the outer end of the female sealing surface of the cylindrical body and the O-ring, and the distance between the outer end of the refrigerant discharge passage of the plug and the outer end of the female thread of the cylindrical body are Since the distance between the inner end of the screw and the outer end of the female screw of the cylindrical body is shorter, the plug is removed from the cylindrical body while the pressure in the refrigeration cycle, that is, the heat exchanger is still relatively high. Even in this case, the following effects can be obtained. That is, when the plug is removed from the cylindrical main body, the inner diameter of the female-side seal surface of the cylindrical main body is equal to the inner diameter of the female screw and the male screw at the time before turning the plug and releasing the screw alignment between the female screw and the male screw. Due to the fact that it is larger than the outer diameter, a gap is formed between the female-side sealing surface and the male thread of the plug, and the inside and outside of the liquid receiver communicate with each other through the refrigerant vent passage and the gap. Therefore, the refrigerant remaining in the heat exchanger passes outside through the refrigerant vent passage and the gap. Therefore, when the screwing of the female thread of the cylindrical body and the male thread of the plug is released, the pressure in the refrigeration cycle, i.e., the heat exchanger, has dropped, preventing the plug from popping out vigorously. The

  According to the heat exchangers 2) and 3), in the heat exchanger 1), the refrigerant vent passage can be formed relatively easily.

  According to the heat exchanger of 4) above, the plug is formed with a recessed portion that is recessed outward from the inner end surface thereof, and at least a part of the male-side sealing surface is provided on the outer peripheral surface of the peripheral wall of the recessed portion. A through hole for removing a refrigerant is formed in a portion of the peripheral wall of the recessed portion where the male sealing surface is provided and inside the O-ring, and the outer end of the female sealing surface of the cylindrical main body Since the distance to the through hole is shorter than the distance between the inner end of the male thread of the plug and the outer end of the female thread of the cylindrical body, the pressure in the refrigeration cycle, that is, the heat exchanger is still relatively Even when the plug is removed from the cylindrical main body while it is high, the following effects can be obtained. That is, when the plug is removed from the cylindrical body, the inside and outside of the liquid receiver can be communicated through the through hole for removing the refrigerant before turning the plug and releasing the screw alignment between the female screw and the male screw. The refrigerant remaining in the heat exchanger passes outside through the through hole for removing the refrigerant. Therefore, when the screwing of the female thread of the cylindrical body and the male thread of the plug is released, the pressure in the refrigeration cycle, i.e., the heat exchanger, has dropped, preventing the plug from popping out vigorously. The

  According to the heat exchanger of 5) above, the refrigerant vent passage through which the inside and outside of the liquid receiver are passed when the O-ring comes outside the female-side seal surface in the portion of the cylindrical body where the female thread is provided The distance from the outer end of the female sealing surface of the cylindrical body to the O-ring is shorter than the distance between the inner end of the male thread of the plug and the outer end of the female thread of the cylindrical body. Even when the plug is removed from the cylindrical main body while the pressure in the refrigeration cycle, that is, the heat exchanger is still relatively high, the following effects can be obtained. That is, when the plug is removed from the cylindrical body, the inner diameter of the male seal surface of the plug is set to the outer diameter of the male screw and the female screw at the time before the screw is turned and the screw alignment of the female screw and the male screw is released. Due to the fact that it is smaller than the inner diameter, a gap is formed between the male-side sealing surface and the female thread of the cylindrical main body, and the inside and outside of the liquid receiver are connected via the refrigerant vent passage and the gap. Therefore, the refrigerant remaining in the heat exchanger passes outside through the refrigerant vent passage and the gap. Therefore, when the screwing of the female thread of the cylindrical body and the male thread of the plug is released, the pressure in the refrigeration cycle, i.e., the heat exchanger, has dropped, preventing the plug from popping out vigorously. The

  According to the heat exchangers 6) and 7), in the heat exchanger 5), the refrigerant vent passage can be formed relatively easily.

 According to the heat exchanger of the above 8), the refrigerant drainage that allows the inside and outside of the receiver to pass through when the O-ring comes outside the female-side seal surface in the part where the external thread of the plug is provided. A concave groove is formed, and the distance from the outer end of the female sealing surface of the cylindrical body to the O-ring is shorter than the distance between the inner end of the male thread of the plug and the outer end of the female thread of the cylindrical body. Therefore, even when the plug is removed from the cylindrical body while the pressure in the refrigeration cycle, that is, in the heat exchanger is still relatively high, the following effects can be obtained. That is, when the plug is removed from the cylindrical body, the inner diameter of the male seal surface of the plug is set to the outer diameter of the male screw and the female screw at the time before the screw is turned and the screw alignment of the female screw and the male screw is released. Due to the fact that the gap is smaller than the inner diameter, a gap is formed between the male-side sealing surface and the female thread of the cylindrical main body, and the refrigerant drainage groove and the gap Since the inside and the outside are communicated, the refrigerant remaining in the heat exchanger passes outside through the groove for removing the refrigerant and the gap. Therefore, when the screwing of the female thread of the cylindrical body and the male thread of the plug is released, the pressure in the refrigeration cycle, i.e., the heat exchanger, has dropped, preventing the plug from popping out vigorously. The

  Embodiments of the present invention will be described below with reference to the drawings.

  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. In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  In addition, the same code | symbol is attached | subjected to the same part and the same thing through all drawings, and the overlapping description is abbreviate | omitted.

Embodiment 1
This embodiment is shown in FIGS.

  FIG. 1 shows the overall configuration of the heat exchanger, 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 fins (5) and brazed to the corrugated fins (5), and fixed to the left tank (2) via mounting members (8) And a liquid receiver (7).

  Both tanks (2) and (3) of the heat exchanger (1) are divided vertically by partition walls (9) and (11) at the same height at the bottom, thereby condensing the gas-phase refrigerant. Function of the condenser (12) having the function of a condenser to be a liquid phase, and the function of the supercooler for supercooling the liquid refrigerant condensed in the condenser (12) to a temperature lower by about 5 to 15 ° C. than the condensation temperature And a supercooling section (13) having a vertical line in the same vertical plane.

  Here, the part above the partition wall (9) in the left tank (2) is the left header (14) of the condensing part (12), and the part above the partition wall (11) in the right tank (3) Is the right header (15) of the condenser (12). Further, the part below the partition wall (9) in the left tank (2) is the left header (16) of the supercooling section (13), and the part below the partition wall (11) 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 brazed to the upper end portion of the upper header portion (15a) of the right header (15) of the condensing portion (12), and the right side of the supercooling portion (13). An aluminum refrigerant outlet member (25) leading to a refrigerant outlet (not shown) is brazed to the header (17). In addition, a refrigerant outlet (not shown) for sending refrigerant to the liquid receiver (7) is formed in the lower header part (14b) of the left header (14) of the condenser part (12), and the supercooling part (13) The left header (16) is formed with a refrigerant inlet (not shown) through which refrigerant is fed from the liquid receiver (7). The refrigerant outlet of the lower header portion (14b) of the left header (14) is connected to a refrigerant inlet (not shown) formed in the liquid receiver (7) via a refrigerant inflow passage formed in the mounting member (8). ), And the refrigerant inlet of the left header (16) is connected to a refrigerant outlet (not shown) formed in the receiver (7) through a refrigerant outflow passage formed in the mounting member (8). ing.

  The liquid receiver (7) includes a cylindrical main body (26) with both upper and lower ends open, an aluminum lower cap (27) brazed to the lower end of the cylindrical main body (26) to close the lower end opening, and a cylinder And a cylindrical aluminum plug (28) for closing the upper end opening of the main body (26). The cylindrical body (26) includes an aluminum pipe (30) having a circular cross section and an aluminum stepped cylindrical member brazed to the upper end of the pipe (30) and having an inner peripheral surface of a cylindrical surface. It consists of a screw part (31). A refrigerant inlet and a refrigerant outlet (not shown) are formed below the pipe (30). Although illustration is omitted, a desiccant, a strainer and the like are arranged in the liquid receiver (7).

  As shown in FIG. 2, a cylindrical female seal surface (33) is provided at the upper end of the inner peripheral surface of the threaded part (31) for brazing to the upper end of the pipe (30), and the female threaded part. A female screw (32) is provided at a portion of the inner peripheral surface of (31) that is continuous with the lower side (inward) of the female seal surface (33). Accordingly, a cylindrical female seal surface (33) is provided on the inner peripheral surface of the upper opening end of the cylindrical main body (26), and the female on the inner peripheral surface of the upper opening end of the cylindrical main body (26) is provided. A female screw (32) is provided at a portion of the side seal surface (33) connected inward. The internal diameter of the female-side seal surface (33) of the internal thread component (31) is larger than the internal diameter of the internal thread (32).

  A cylindrical male seal surface (35) is provided at the upper end of the outer peripheral surface of the plug (28), and continues to the lower (inward) side of the male seal surface (35) on the outer peripheral surface of the plug (28). The part is provided with a male screw (34) screwed together with a female screw (32) of a female screw part (31) of the cylindrical main body (26). The outer diameter of the male side sealing surface (35) of the plug (28) is larger than the outer diameter of the male screw (34). An annular groove (36) is formed on the outer peripheral surface of the male side sealing surface (35) of the plug (28), and an O-ring (37) is mounted in the annular groove (36). 37), the space between the female sealing surface (33) of the female thread part (31) of the cylindrical body (26) and the male sealing surface (35) of the plug (28) is sealed. Further, the plug (28) is formed with a recess (38) which is recessed from the lower end surface (inner end surface) to the upper side (outside) and slightly above the upper end of the external screw (34). As a result, all of the screws (34) are provided on the outer peripheral surface of the peripheral wall (38a) of the recessed portion (38). A through hole (39) (refrigerant passage) is formed in a portion of the peripheral wall (38a) of the recessed portion (38) of the plug (28) where the male screw (34) is provided. When the upper end (outer end) of the through hole (39) comes above (outside) the female thread (32) of the female thread part (31) of the cylindrical body (26), the liquid receiver (7 ) (See Fig. 3). In addition, a square hole (41) for inserting a wrench for rotating the plug (28) around the axis is formed on the upper end surface of the plug (28).

  Here, the distance (L1) between the upper end (outer end) of the female sealing surface (33) of the female thread part (31) and the O-ring (37) and the upper end (outside of the through hole (39) of the plug (28) End) and the distance (L2) between the female seal surface (33) of the female screw part (31) and the lower end (inner end) of the female seal part (31) is the lower end (inner end) of the female thread (34) of the plug (28) and female thread part, respectively. It is shorter than the distance (L3) from the upper end (outer end) of the female thread (32) of (31). Therefore, as shown in FIG. 3, when replacing the desiccant disposed in the receiver (7), the plug (28) is turned to remove the plug (28) from the cylindrical body (26). As a result, the inner diameter of the female seal surface (33) of the female thread component (31) is less than the inner diameter of the female thread (32) and the female thread (32) at the time before releasing the screw alignment of the female thread (32) and male thread (34). Due to the larger outer diameter of the male thread (34) of the plug (28), the female side sealing surface (33) of the female thread part (31) and the male thread (34) of the plug (28) A gap (42) is formed between the liquid receiver (7) and the inside and outside of the liquid receiver (7) through the through hole (39) and the gap (42). As a result, when the plug (28) is removed, even if the refrigerant remains in the refrigeration cycle, that is, in the heat exchanger (1) and the internal pressure is still relatively high, the remaining refrigerant remains in the through hole ( 39) and the gap (42), the refrigeration cycle is released when the screwing of the female thread (32) of the cylindrical body (26) and the male thread (34) of the plug (28) is released. The pressure inside, that is, the heat exchanger (1) is reduced, and the plug (28) is prevented from rushing upward.

  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 formed in the lower header portion (14b), and is attached to the mounting member (8). The refrigerant flows into the liquid receiver (7) from the refrigerant inlet formed in the pipe and the refrigerant inlet formed in the pipe (30) of the cylindrical body (26) of the liquid receiver (7). In the liquid receiver (7), the liquid is separated and the water is removed.

  The liquid-phase refrigerant separated from the gas-phase refrigerant is a refrigerant outlet formed in the pipe (30) of the cylindrical body (26) of the liquid receiver (7), and a refrigerant outflow path formed in the mounting member (8). And enters the left header (16) through the refrigerant inlet formed in 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 an expansion valve.

Embodiment 2
This embodiment is shown in FIG. 4 and FIG.

  4 and 5 show the configuration of the main part of the heat exchanger of this embodiment.

  As shown in FIG. 4, in the peripheral wall (38a) of the recessed part (38) of the plug (28) which closes the upper end opening of the cylindrical body (26) of the liquid receiver (7) in the heat exchanger of this embodiment. Is formed with a notch (45) (refrigerant passage) from its lower end (inner end). The notch (45) is made to pass inside and outside of the receiver (7) when its upper end (outer end) comes above (outside) the female thread (32) of the female thread component (31). ing.

  Here, the distance (L1) between the upper end (outer end) of the female-side sealing surface (33) of the female thread part (31) and the O-ring (37) and the upper end (outside of the notch (45) of the plug (28) End) and the distance (L4) between the female seal surface (33) of the female thread part (31) and the lower end (inner end) of the female side (33) is cylindrical with the lower end (inner end) of the male thread (34) of the plug (28) It is shorter than the distance (L3) from the upper end (outer end) of the internal thread (32) of the main body (26).

  Therefore, as shown in FIG. 5, when replacing the desiccant disposed in the liquid receiver (7), the plug (28) is turned to remove the plug (28) from the cylindrical body (26). As a result, the inner diameter of the female seal surface (33) of the female thread component (31) is less than the inner diameter of the female thread (32) and the female thread (32) at the time before releasing the screw alignment of the female thread (32) and male thread (34). Due to the larger outer diameter of the male thread (34) of the plug (28), the female side sealing surface (33) of the female thread part (31) and the male thread (34) of the plug (28) A gap (42) is formed between the liquid receiver (7) and the inside and outside of the liquid receiver (7) through the notch (45) and the gap (42). As a result, when the plug (28) is removed, even if the refrigerant remains in the refrigeration cycle, that is, in the heat exchanger (1) and the internal pressure is still relatively high, the remaining refrigerant is notched ( 45) and the gap (42), and the refrigeration cycle is released when the screwing of the female screw (32) of the cylindrical body (26) and the male screw (34) of the plug (28) is released. The pressure inside, that is, the heat exchanger (1) is reduced, and the plug (28) is prevented from rushing upward.

Embodiment 3
This embodiment is shown in FIG. 6 and FIG.

  6 and 7 show the configuration of the main part of the heat exchanger of this embodiment.

  As shown in FIG. 6, in the peripheral wall (38a) of the recess (38) of the plug (28) that closes the upper end opening of the cylindrical body (26) of the liquid receiver (7) in the heat exchanger of this embodiment. A through hole (50) for removing a refrigerant is formed in a portion where the male side sealing surface (35) is provided and in a lower side (inside) than the O-ring (37). When the upper end (outer end) of the through hole (50) comes above (outside) the upper end of the female screw part (31), the inside and outside of the liquid receiver (7) are allowed to pass therethrough.

  Here, the distance (L5) between the upper end (outer end) of the female sealing surface (33) of the female thread part (31) and the through hole (50) for refrigerant removal is the male thread (34) of the plug (28). Is shorter than the distance (L3) between the lower end (inner end) and the upper end (outer end) of the female thread (32) of the female thread component (31).

  Accordingly, as shown in FIG. 7, when replacing the desiccant disposed in the liquid receiver (7), the plug (28) is turned to remove the plug (28) from the cylindrical body (26). As a result, at the point before releasing the screw alignment of the female screw (32) and the male screw (34), the inside and outside of the liquid receiver (7) can be communicated through the refrigerant vent hole (50). Become. As a result, when the plug (28) is removed, even if the refrigerant remains in the refrigeration cycle, that is, in the heat exchanger (1) and the internal pressure is still relatively high, the remaining refrigerant is used for removing the refrigerant. Since it goes out through the through hole (50), when the screwing of the female screw (32) of the cylindrical body (26) and the male screw (34) of the plug (28) is released, That is, the pressure in the heat exchanger is lowered, and the plug (28) is prevented from jumping upward vigorously.

Embodiment 4
This embodiment is shown in FIG. 8 and FIG.

  8 and 9 show the configuration of the main part of the heat exchanger of this embodiment.

  As shown in FIG. 8, the upper end of the pipe (30) of the cylindrical body (26) of the liquid receiver (7) in the heat exchanger of this embodiment is brazed, and the inner peripheral surface is a cylindrical surface. In the case of an aluminum stepped cylindrical female screw part (55), a female thread (56) is provided at the upper end of the inner peripheral surface of the female screw part (55). A cylindrical surface-shaped female-side sealing surface (57) is provided in a portion continuous downward (inward). Accordingly, a female screw (56) is provided on the inner peripheral surface of the upper opening end of the cylindrical body (26), and the female screw (56) on the inner peripheral surface of the upper opening end of the cylindrical main body (26) is provided. A cylindrical female side sealing surface (57) is provided in a portion that is continuous inward. The internal diameter of the female-side seal surface (57) of the female thread component (55) is smaller than the internal diameter of the female thread (56). Further, a vertically long through hole (58) (refrigerant passage) is formed in a portion of the peripheral wall (55a) of the female screw component (55) where the female screw (56) is formed. The through hole (58) allows the O-ring (64), which will be described later, to pass through the inside and outside of the liquid receiver (7) when it comes to the upper side (outside) of the upper end (outer end) of the female side sealing surface (57). It is like that.

  The female screw part (55) of the cylindrical main body (26) is removed from the outer peripheral surface of the plug (59) except for the lower end of the plug (59) that closes the upper end opening of the cylindrical main body (26) of the liquid receiver (7). A male screw (61) that is screwed with the screw (56) is provided, and a cylindrical male seal surface on the outer peripheral surface of the plug (59) is connected to the lower part (inward) of the male screw (61). (62) is provided. The outer diameter of the male side sealing surface (62) of the plug (59) is smaller than the outer diameter of the male screw (61). An annular groove (63) is formed on the outer peripheral surface of the male seal surface (62) of the plug (59), and an O-ring (64) is mounted in the annular groove (63). 64) seals between the female sealing surface (57) of the female thread part (55) of the cylindrical body (26) and the male sealing surface (62) of the plug (59).

  Here, the distance (L6) between the upper end (outer end) of the female sealing surface (57) of the female thread part (55) and the O-ring (64) is the lower end of the male thread (61) of the plug (59) ( The distance between the inner end) and the upper end (outer end) of the female screw (56) of the female screw component (55) is shorter.

  Therefore, as shown in FIG. 9, when replacing the desiccant disposed in the liquid receiver (7), the plug (59) is turned to remove the plug (59) from the cylindrical body (26). When the O-ring (64) reaches the upper side of the upper end of the female-side sealing surface (57) before releasing the screw alignment between the female screw (56) and the male screw (61), the plug ( Due to the fact that the outer diameter of the male side sealing surface (62) of 59) is smaller than the outer diameter of the male thread (61) and the inner diameter of the female thread (56) of the female thread part (55), A gap (65) is formed between the male side sealing surface (62) of (59) and the female thread (56) of the female thread component (55), and through the through hole (58) and the clearance (65). The inside and outside of the liquid receiver (7) will be communicated. As a result, when the plug (59) is removed, even if the refrigerant remains in the refrigeration cycle, that is, in the heat exchanger (1) and the internal pressure is still relatively high, the remaining refrigerant remains in the through hole ( 58) and the gap (65), the refrigeration cycle is released when the screwing of the female screw (56) of the cylindrical body (26) and the male screw (61) of the plug (59) is released. The pressure inside the heat exchanger (1) is reduced, and the plug (59) is prevented from jumping out upward.

Embodiment 5
This embodiment is shown in FIGS.

  10-12 shows the structure of the principal part of the heat exchanger of this embodiment.

  As shown in FIGS. 10 and 11, the inner periphery of the portion of the receiver (7) of the heat exchanger of this embodiment provided with the female thread (56) of the peripheral wall (55a) of the female thread part (55). A concave groove (70) (coolant vent passage) extending in the vertical direction is formed on the surface. The groove (70) allows the O-ring (64) to pass through the inside and outside of the receiver (7) when it comes to the upper side (outside) of the upper end (outer end) of the female sealing surface (57). It has become.

  Here, the distance (L6) between the upper end (outer end) of the female sealing surface (57) of the female thread part (55) and the O-ring (64) is the lower end of the male thread (61) of the plug (59) ( It is shorter than the distance (L7) between the inner end) and the upper end (outer end) of the internal thread (56) of the internal thread component (55).

  Therefore, as shown in FIG. 12, when replacing the desiccant disposed in the liquid receiver (7), the plug (59) is turned to remove the plug (59) from the cylindrical body (26). When the O-ring (64) reaches the upper side of the upper end of the female-side sealing surface (57) before releasing the screw alignment between the female screw (56) and the male screw (61), the plug ( Due to the fact that the outer diameter of the male side sealing surface (62) of 59) is smaller than the outer diameter of the male thread (61) and the inner diameter of the female thread (56) of the female thread part (55), A gap (65) is formed between the male side sealing surface (62) of (59) and the female thread (56) of the female thread component (55), and through the concave groove (70) and the clearance (65). The inside and outside of the liquid receiver (7) will be communicated. As a result, when the plug (59) is removed, even if the refrigerant remains in the refrigeration cycle, that is, in the heat exchanger (1) and the internal pressure is still relatively high, the remaining refrigerant remains in the concave groove ( 70) and the gap (65) to the outside, so when the screwing of the female screw (56) of the cylindrical body (26) and the male screw (61) of the plug (59) is released, the refrigeration cycle The pressure inside the heat exchanger (1) is reduced, and the plug (59) is prevented from jumping out upward.

  In the fifth embodiment, the concave thread (70) is formed by removing the thread of the male screw (61) over the entire height and excavating the outer peripheral surface of the plug (59). The concave groove (70) may be formed only by removing the entire screw thread or by partially removing the thread of the male screw (61).

Embodiment 6
This embodiment is shown in FIGS.

  FIGS. 13-15 shows the structure of the principal part of the heat exchanger of this embodiment.

  As shown in FIGS. 13 and 14, the external thread (61) of the outer peripheral surface of the plug (59) that closes the upper end opening of the cylindrical body (26) in the liquid receiver (7) of the heat exchanger of this embodiment. In the portion where is provided, there is formed a groove for draining the refrigerant (75) extending in the vertical direction. The concave groove (75) allows the O-ring (64) to pass through the inside and outside of the receiver (7) when it comes to the upper side (outside) of the upper end (outer end) of the female sealing surface (57). It has become.

  Here, the distance (L6) between the upper end (outer end) of the female sealing surface (57) of the female thread part (55) and the O-ring (64) is the lower end of the male thread (61) of the plug (59) ( It is shorter than the distance (L7) between the inner end) and the upper end (outer end) of the internal thread (56) of the cylindrical body (26).

  Therefore, as shown in FIG. 15, when replacing the desiccant disposed in the liquid receiver (7), the plug (59) is turned to remove the plug (59) from the cylindrical body (26). When the O-ring (64) reaches the upper side of the upper end of the female-side sealing surface (57) before releasing the screw alignment between the female screw (56) and the male screw (61), the plug ( Due to the fact that the outer diameter of the male side sealing surface (62) of 59) is smaller than the outer diameter of the male thread (61) and the inner diameter of the female thread (56) of the female thread part (55), A gap (65) is formed between the male side sealing surface (62) of (59) and the female thread (56) of the female screw part (55), and through the concave groove (75) and the gap (65). The inside and outside of the liquid receiver (7) will be communicated. As a result, when the plug (59) is removed, even if the refrigerant remains in the refrigeration cycle, that is, in the heat exchanger (1) and the internal pressure is still relatively high, the remaining refrigerant remains in the concave groove ( 75) and the gap (65), the refrigeration cycle is released when the screwing of the female thread (56) of the cylindrical body (26) and the male thread (61) of the plug (59) is released. The pressure inside the heat exchanger (1) is reduced, and the plug (59) is prevented from jumping out upward.

  In the sixth embodiment, the concave groove (75) is formed by removing the thread of the female screw (56) over the entire height and excavating the inner peripheral surface of the peripheral wall (55a) of the female screw component (55). However, the concave groove (75) may be formed only by removing the thread of the female screw (56) over its entire height, or by partially removing the thread of the female screw (56).

  In the first to sixth embodiments, the cylindrical body of the receiver is composed of the pipe (30) and the stepped cylindrical female screw parts (31) and (55) brazed to the upper end of the pipe (30). However, the present invention is not limited to this, and the entire cylindrical main body is composed of one member, and the female threads (32) (56) and female-side sealing surfaces (33) (57) are provided at the upper end of the cylindrical main body. May be.

  In the first to sixth embodiments, the plug (28) (59) is screwed into the upper end opening of the cylindrical main body. Conversely, the plug (28) is inserted into the lower end opening of the cylindrical main body. (59) may be screwed.

It is a front view which shows the whole structure of the heat exchanger of Embodiment 1 of this invention. It is a vertical longitudinal cross-sectional view which expands and shows the upper end part of the liquid receiver of the heat exchanger shown in FIG. FIG. 2 is a partially enlarged vertical vertical sectional view of an upper end portion of a liquid receiver showing a state in which a plug of the liquid receiver of the heat exchanger shown in FIG. 1 is removed from a cylindrical main body. It is a figure equivalent to FIG. 2 which shows the principal part of the heat exchanger of Embodiment 2 of this invention. It is a figure equivalent to FIG. 3 which shows the state which removes the plug of the receiver of the heat exchanger shown in FIG. 4 from a cylindrical main body. It is a figure equivalent to FIG. 2 which shows the principal part of the heat exchanger of Embodiment 3 of this invention. It is a figure equivalent to FIG. 3 which shows the state which removes the plug of the receiver of the heat exchanger shown in FIG. 6 from a cylindrical main body. It is a figure equivalent to FIG. 2 which shows the principal part of the heat exchanger of Embodiment 4 of this invention. It is a figure equivalent to FIG. 3 which shows the state which removes the plug of the liquid receiver of the heat exchanger shown in FIG. 8 from a cylindrical main body. It is a figure equivalent to FIG. 2 which shows the principal part of the heat exchanger of Embodiment 5 of this invention. It is a perspective view of the internal thread component used for the cylindrical main body of the liquid receiver of the heat exchanger shown in FIG. It is a figure equivalent to FIG. 3 which shows the state which removes the plug of the receiver of the heat exchanger shown in FIG. 10 from a cylindrical main body. It is a figure equivalent to FIG. 2 which shows the principal part of the heat exchanger of Embodiment 6 of this invention. It is a perspective view of the plug used for the liquid receiver of the heat exchanger shown in FIG. It is a figure equivalent to FIG. 3 which shows the state which removes the plug of the liquid receiver of the heat exchanger shown in FIG. 13 from a cylindrical main body.

Explanation of symbols

(1): Heat exchanger
(2) (3): Tank
(4): Heat exchange pipe
(7): Receiver
(26): Cylindrical body
(28) (59): Plug
(30): Pipe
(31) (55): Female thread parts
(32) (56): Female thread
(33) (57): Female side sealing surface
(34) (61): Male thread
(35) (62): Male sealing surface
(37) (64): O-ring
(38): Recess
(38a): Perimeter wall
(39): Through hole (refrigerant passage)
(45): Notch
(50): Through hole for removing refrigerant
(55a): Perimeter wall
(58): Through hole (refrigerant drain passage)
(70): Groove (refrigerant passage)
(75): Recess groove for removing refrigerant

Claims (8)

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 fin disposed between adjacent heat exchange tubes and a liquid receiver attached to one of the tanks, the liquid receiver extending in the vertical direction and having a cylindrical shape with at least one end opened. In a heat exchanger having a main body and a plug screwed into the open end of the cylindrical main body,
A cylindrical female seal surface is provided on the inner peripheral surface of the opening end of the cylindrical main body, and the inner peripheral surface of the opening end of the cylindrical main body is connected to the inner side of the female sealing surface. A screw is provided, and a male-side sealing surface having a cylindrical surface is provided at the outer end of the outer peripheral surface of the plug, and the female screw is screwed onto a portion of the outer peripheral surface of the plug that is continuous with the inner side of the male-side sealing surface. The internal diameter of the female seal surface of the cylindrical body is larger than the internal diameter of the female thread, and the external diameter of the male seal surface of the plug is larger than the external diameter of the external thread. The female sealing surface of the plug and the male sealing surface of the plug are sealed by an O-ring to form a recessed portion recessed outward from the inner end surface of the plug, and a screw on the outer peripheral surface of the peripheral wall of the recessed portion. At least a portion is provided and the plug is recessed. A refrigerant vent passage is formed in the portion of the peripheral wall of the peripheral wall where the male screw is provided, and when the outer end of the refrigerant vent passage comes outside the internal thread of the cylindrical main body, the inside and outside of the liquid receiver are passed through. The distance between the outer end of the female sealing surface of the cylindrical body and the O-ring, and the distance between the outer end of the refrigerant discharge passage of the plug and the outer end of the female thread of the cylindrical body are determined by the male thread of the plug. The heat exchanger is shorter than the distance between the inner end of the tube and the outer end of the internal thread of the cylindrical body. The heat exchanger according to claim 1, wherein the refrigerant vent passage is formed by a through hole formed in a peripheral wall of the recessed portion of the plug. The heat exchanger according to claim 1, wherein the refrigerant vent passage is formed by a notch formed in the peripheral wall of the recessed portion of the plug from the inner end. 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 fin disposed between adjacent heat exchange tubes and a liquid receiver attached to one of the tanks, the liquid receiver extending in the vertical direction and having a cylindrical shape with at least one end opened. In a heat exchanger having a main body and a plug screwed into the open end of the cylindrical main body,
A cylindrical female seal surface is provided on the inner peripheral surface of the opening end of the cylindrical main body, and the inner peripheral surface of the opening end of the cylindrical main body is connected to the inner side of the female sealing surface. A screw is provided, and a male-side sealing surface having a cylindrical surface is provided at the outer end of the outer peripheral surface of the plug, and the female screw is screwed onto a portion of the outer peripheral surface of the plug that is continuous with the inner side of the male-side sealing surface. The internal diameter of the female seal surface of the cylindrical body is larger than the internal diameter of the female thread, and the external diameter of the male seal surface of the plug is larger than the external diameter of the external thread. Between the female side sealing surface of the plug and the male side sealing surface of the plug is sealed by an O-ring, and the plug is formed with a concave portion recessed outward from the inner end surface thereof, and the male side seal is formed on the outer peripheral surface of the peripheral wall of the concave portion. At least part of the surface is provided with a plug A through hole for extracting a refrigerant is formed in a portion of the peripheral wall of the recessed portion where the male side sealing surface is provided and inside the O-ring, and the outer end of the female side sealing surface of the cylindrical body and the through hole for extracting the refrigerant A heat exchanger in which the distance to the hole is shorter than the distance between the inner end of the male screw of the plug and the outer end of the female screw of the cylindrical body. 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 fin disposed between adjacent heat exchange tubes and a liquid receiver attached to one of the tanks, the liquid receiver extending in the vertical direction and having a cylindrical shape with at least one end opened. In a heat exchanger having a main body and a plug screwed into the open end of the cylindrical main body,
A female thread is provided on the inner peripheral surface of the opening end of the cylindrical main body, and a cylindrical female seal surface is formed on the inner peripheral surface of the opening end of the cylindrical main body and connected to the inner side of the female thread. A male screw is provided at the outer end of the outer peripheral surface of the plug and is screwed with the female screw. A cylindrical male seal surface is formed on the outer peripheral surface of the plug and connected to the inner side of the male screw. Provided, the inner diameter of the female sealing surface of the cylindrical body is smaller than the inner diameter of the female thread, and the outer diameter of the male sealing surface of the plug is smaller than the outer diameter of the male thread. When the O-ring comes to the outside of the female-side seal surface at the portion where the female thread of the cylindrical body is provided with a seal between the surface and the male-side seal surface of the plug. A refrigerant vent passage is formed through the inside and outside of the tube, and the female side seat of the tubular body is formed. Distance from the outer end surface until the O-ring, the heat exchanger is shorter than the distance between the outer end of the internal thread of the inner end and the tubular body of the plug of the external thread. The heat exchanger according to claim 5, wherein the refrigerant vent passage includes a through hole formed in a portion of the peripheral wall of the cylindrical main body where the female screw is provided. The heat exchanger according to claim 5, wherein the refrigerant vent passage is formed of a concave groove extending in a vertical direction formed in a portion provided with the female screw on the inner peripheral surface of the peripheral wall of the cylindrical main body. 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 fin disposed between adjacent heat exchange tubes and a liquid receiver attached to one of the tanks, the liquid receiver extending in the vertical direction and having a cylindrical shape with at least one end opened. In a heat exchanger having a main body and a plug screwed into the open end of the cylindrical main body,
A female thread is provided on the inner peripheral surface of the opening end of the cylindrical main body, and a cylindrical female seal surface is formed on the inner peripheral surface of the opening end of the cylindrical main body and connected to the inner side of the female thread. A male screw is provided at the outer end of the outer peripheral surface of the plug and is screwed with the female screw. A cylindrical male seal surface is formed on the outer peripheral surface of the plug and connected to the inner side of the male screw. Provided, the inner diameter of the female sealing surface of the cylindrical body is smaller than the inner diameter of the female thread, and the outer diameter of the male sealing surface of the plug is smaller than the outer diameter of the male thread. When the O-ring comes to the outside of the female-side seal surface in the portion where the male thread is sealed between the surface and the male-side seal surface of the plug and the external thread on the outer peripheral surface of the plug is provided A groove for draining the coolant that passes through the inside and outside of the vessel is formed, Distance from the outer end of the side sealing surface to O-ring, the heat exchanger is shorter than the distance between the outer end of the internal thread of the inner end and the tubular body of the plug of the external thread.

Images