JP2017003163A - Evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an evaporator capable of improving the defrosting efficiency.SOLUTION: An evaporator 1 includes: a plurality of fin groups 3 comprising a plurality of plate fins 2; a heat exchange pipe 4 comprising a plurality of straight pipe parts 5 and bent pipe parts 6, 7 for connecting two adjacent straight pipe parts 5; a defrosting pipe heater 8 comprising a plurality of straight pipe parts 9 and bent pipe parts 10, 11 for connecting two adjacent straight pipe parts 9; and side plates 12, 13 arranged on an outer side in the longitudinal direction of all the fin groups 3. The bent pipe parts 10, 11 of the defrosting pipe heater 8 are arranged inside both side plates 12, 13. The length in the cross direction of the plate fins 2 around the bent pipe part 10 of the defrosting pipe heater 8 is made short so as to avoid contact with the bent pipe part 10 of the defrosting pipe heater 8. The straight pipe part 9 of the defrosting pipe heater 8 is fixed to the straight pipe part 5 of the heat exchange pipe 4 via fixtures 18, 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an evaporator, and more particularly to an evaporator suitably used in a refrigeration cycle used in a refrigeration / refrigeration apparatus such as a refrigerator, a refrigerated showcase, a freezer, and a refrigerated showcase.

  In this specification and claims, the top and bottom, left and right in FIG. 2 are referred to as top and bottom, and left and right. The front side of FIG. 2 (left side in FIGS. 3 and 4) is the front, and the opposite side is the back. .

  For example, a refrigeration cycle including a compressor, a condenser, and an evaporator is installed in a heat insulating box of a refrigerator. As an evaporator of such a refrigeration cycle, frost forms on each plate fin due to moisture in the air. When such frost formation occurs, the adhering frost acts as a resistance and the amount of air flowing between the plate fins of each fin group decreases rapidly, or the air flows between the air and the refrigerant flowing in the heat exchange pipe. There has been a problem that the cooling efficiency decreases in a relatively short time due to a rapid decrease in the amount of heat. Therefore, when the amount of frost formation exceeds a certain amount, it is necessary to melt and remove the frost.

  As an evaporator capable of defrosting the generated frost, for example, a plurality of plate fins arranged in parallel in the left-right direction and a plurality of fin groups provided at intervals in the up-down direction, and plate fins of each fin group A heat exchange pipe comprising a plurality of straight pipe portions fixed in a penetrating manner and extending in the left-right direction and two adjacent straight pipe portions and having one less bent pipe portion than the straight pipe portions; A pipe heater for defrost consisting of a plurality of straight pipe sections and two adjacent straight pipe sections connected to each other and including one bent pipe section less than the straight pipe sections, and arranged on the outer side in the left-right direction of all the fin groups. It is known that the straight pipe portion of the defrosting pipe heater is fixed to the side plate, and the bent pipe portion of the defrosting pipe heater protrudes outward from both side plates (Patent Document 1). reference).

  However, in the evaporator described in Patent Document 1, the straight pipe portion of the defrosting pipe heater is fixed by the side plate, and the bent pipe portion of the defrosting pipe heater protrudes to the outside of the both side plates. Heat is released to the outer space of both side plates. For this reason, the bent pipe portion of the defrosting pipe heater that protrudes outward from both side plates consumes power wastefully and protrudes outward from the side plate, so that the length of the defrosting pipe heater is relatively long. And the material cost increases.

Japanese Patent No. 5636253

  The objective of this invention is providing the evaporator which solves the said problem and can transmit the heat | fever emitted from the bending pipe part of the pipe heater for a defrost efficiently to a plate fin, and can improve a defrost efficiency.

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

  1) A fin group composed of a plurality of plate fins arranged in parallel in the left-right direction, and a plurality of fin groups provided at intervals in the vertical direction, and extending in the left-right direction fixed to the plate fins of each fin group in a penetrating manner. A heat exchange pipe comprising a plurality of straight pipe sections and two adjacent straight pipe sections and having a number of bent pipe sections one less than that of the straight pipe sections; a plurality of straight pipe sections extending in the left-right direction; An evaporator comprising a pipe heater for defrost consisting of a number of bent pipe parts connected to the straight pipe part and one less than the straight pipe part, and a side plate arranged on the outer side in the left-right direction of all the fin groups, The bent pipe portion of the defrosting pipe heater is disposed inside the both side plates, and the length of the plate fin in the front-rear direction around the bent pipe portion of the defrosting pipe heater is the bent pipe portion of the defrosting pipe heater. Is shortened to avoid contact with An evaporator in which the straight pipe part of the defrosting pipe heater is fixed to the straight pipe part of the heat exchange pipe via a fixture located between the plate fins adjacent to each other in the left-right direction of the fin group adjacent to the air flow direction. .

  2) The front side of the defrosting pipe heater fitted in the two front straight pipe parts adjacent to the air flow direction of the heat exchange pipe fixed to the plate fin and the heater fitting part located in front of the straight pipe part. The positional relationship with the straight pipe portion forms a triangular shape in side view, and is also located on the rear side of the two rear straight pipe portions adjacent to each other in the air flow direction of the heat exchange pipe fixed to the plate fin and the straight pipe portion. The positional relationship with the rear straight pipe part of the defrosting pipe heater fitted in the heater fitting part is a triangle when viewed from the side, and the front fixture is directly connected to the front side of the defrosting pipe heater. An elastically deformable C-shape that holds the tube in a detachable manner and has a front holding portion with the opening facing the rear side, and a rear obliquely upward direction integrally with the holding portion at the upper end of the holding portion and the lower side of the holding portion Elastically deformable front extended obliquely downward at the front end integrally with the holding part The front arm part is curved so that the front arm part is engaged with the rear peripheral surface of the front straight pipe part adjacent to the air flow direction of the heat exchange pipe, and the front holding part is a defrosting pipe. While holding the front straight pipe part of the heater, the front arm part engages with the rear peripheral surface of the front straight pipe part adjacent in the air flow direction of the heat exchange pipe, respectively. The pipe part is fixed to the front straight pipe part of the heat exchange pipe via a fixture, and the rear fixture is elastically deformable to detachably hold the rear straight pipe part of the defrosting pipe heater. A rear holding part with a C-shape and an opening facing the front side, a front diagonally upward direction integrally with the holding part at the upper end part of the holding part, and a front diagonally downward direction integrally with the holding part at the lower end part of the holding part A rear arm portion that is elastically deformable and is extended to the front end of the rear arm portion adjacent to the air flow direction of the heat exchange pipe The rear arm is a heat exchange tube with a curved shape so as to engage with the front peripheral surface of the side straight pipe, and the rear holding part holding the rear straight pipe of the defrosting pipe heater. The rear straight pipe part of the defrosting pipe heater is engaged with the front peripheral surface of the rear straight pipe part adjacent to each other in the air flow direction of the heat exchange pipe via the fixture. The evaporator of 1) fixed to the part.

  3) The straight pipe part of the heat exchange pipe is fixed to the side plate, and walls facing the opposite direction to each other are provided on the front and rear side edges of the both side plates, and air is provided between the walls provided on the front and rear sides of the side plate. The evaporator according to 1) or 2) above, wherein an air blocking plate is provided to block the flow of air.

  According to the evaporator of 1), the straight pipe portion of the defrosting pipe heater is connected to the straight pipe portion of the heat exchange pipe via the fixtures located on the front side and the rear side between the plate fins adjacent in the air flow direction. The bent pipe portion of the defrosting pipe heater is fixed inside the both side plates, and the length of the plate fin in the front-rear direction around the bent pipe portion of the defrosting pipe heater is the same as that of the defrosting pipe heater. Since it is shortened so as to avoid contact with the bent tube portion, the bent tube portion of the defrosting pipe heater does not protrude outward from the side plate, and power consumption can be reduced. Moreover, the length of the defrosting pipe heater may be relatively short because the bent pipe portion of the defrosting pipe heater does not protrude outward from the side plate, and the material cost can be reduced.

  According to the evaporator of 2), since the straight pipe portion of the defrosting pipe heater can be fixed to the straight pipe portion of the heat exchange pipe by the fixture, it is necessary to fix the straight pipe portion of the defrosting pipe heater to the side plate. Disappear. Therefore, the bent pipe portion of the defrosting pipe heater can be positioned inside the both side plates.

  According to the evaporator of the above 3), since the air flow is blocked by the air blocking plate, it is possible to suppress a decrease in the thermal conductivity of the cold heat of the refrigerant flowing in the straight pipe portion of the heat exchange pipe to the entire plate fin. Can do.

It is a perspective view which shows the whole structure of the evaporator of this invention. It is a front view of the evaporator of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. Fig.5 (a) is a front view of the front side fixing tool used for the evaporator of this invention. FIG.5 (b) is a right side view of the front side fixing tool used for the evaporator of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows the overall configuration of an evaporator (1) according to an embodiment of the present invention, and FIGS. 2 to 5 show the configuration of the main part thereof.

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

  1 to 3, the evaporator (1) is composed of a plurality of aluminum plate fins (2) arranged in parallel in the left-right direction, and a plurality of fins provided at intervals in the up-down direction (ventilation direction). Connects the group (3) to the plate fins (2) of each fin group (3), which are fixed in a penetrating manner and extend in the left-right direction, and two adjacent straight pipe sections (5) In addition, the aluminum heat exchange pipe (4) made up of the bent pipe parts (6) and (7), one less than the straight pipe part (5), and a plurality of straight pipe parts (9) extending in the left-right direction and adjacent to each other. A pipe heater (8) for defrost consisting of two bent pipe parts (10) (11) connected to two straight pipe parts (9) and one less than the straight pipe part (9), and all fin groups ( 3) and aluminum side plates (12) and (13) arranged on the outer side in the left-right direction. As shown by an arrow X in the figure, air flows from the bottom to the top.

  The plate fin (2) has a rectangular flat plate shape that is long in the front-rear direction, and two through holes (14) are formed in the center in the height direction with a space in the front-rear direction. A collar (15) is integrally formed over the entire periphery at the peripheral edge of each through hole (14) in the plate fin (2). Further, a notch (16) is formed at each corner of the plate fin (2). A collar may be integrally formed on the peripheral edge of each notch (16) in the plate fin (2).

  And for the heater in which the straight pipe part (9) of the pipe heater (8) for defrosting is fitted by the notch (16) of the two plate fins (2) adjacent to the fin group (3) adjacent vertically A fitting portion (17) is formed.

  The fin pitch between adjacent plate fins (2) of the fin group (3) on the downstream side (upper side) in the air flow direction is smaller than the fin pitch of the fin group (3) on the upstream side (lower side) in the air flow direction. ing.

  In the illustrated example, the fin pitch between adjacent plate fins (2) of the fin group (3) is the largest at the lower end fin group (3) and decreases toward the upper fin group (3).

  If the fin pitch of the upper fin group (3) is smaller than the fin pitch of the lower fin group (3), the fin pitch of the plurality of fin groups (3) adjacent vertically is The fin pitches of the fin group (3) may be arbitrary.

  The heat exchange pipe (4) includes a plurality of straight pipe sections (5) provided in the same vertical plane at intervals in the vertical direction and extending in the left-right direction, and straight pipe sections (5) adjacent to each other in the vertical direction. Two meandering pipe parts (4a) and (4b) consisting of first bent pipe parts (6) that are alternately connected are arranged at intervals in the front and rear, and both meandering pipe parts (4a) and (4b) The right end portion of the straight pipe portion (5) at the lower end is connected by the second bent pipe portion (7). The straight pipe part (5) of each meandering pipe part (4a) (4b) is passed through each through hole (14) of the plate fin (2) of each fin group (3), and the straight pipe part (5) outer periphery It is fixed to the plate fin (2) so that the surface is in close contact with the collar (15).

  The defrosting pipe heater (8) includes a plurality of straight pipe portions (9) provided in the same vertical plane at intervals in the vertical direction and extending in the left-right direction, and straight pipe portions (9) adjacent to each other in the vertical direction. The two meandering pipe parts (8a) and (8b) consisting of the first bent pipe parts (10) which connect the left and right alternately are arranged at intervals in the front and rear, and both meandering pipe parts (8a) and (8b) The left end of the straight pipe portion (9) at the lower end of) is connected by the second bent pipe portion (11). In each meandering pipe part (8a) (8b), except for the straight pipe part (9) at the upper end, the pitch between the straight pipe parts (9) vertically adjacent to each other is equal to each other and for heaters adjacent vertically The pitch between the straight pipe section (9) at the upper end and the second straight pipe section (9) from the top is equal to the other vertical pipe section ( 9) It is twice the pitch between.

  The other straight pipe sections (9) except for the straight pipe section (9) at the lower end of each meandering pipe section (8a) (8b) are two plate fins adjacent to each other in the upper and lower adjacent fin groups (3). The outer peripheral surface of the straight pipe part (9) is fitted in the heater fitting part (17) consisting of the notch (16) of 2), so that the straight pipe part (9) is connected to the plate fin (2). It is in contact with both front and rear edges. Further, the straight pipe portion (9) at the lower end of each meandering pipe portion (8a) (8b) has an outer periphery in the lower notch (16) in the plate fin (2) of the fin group (3) at the lower end. Part of the surface is fitted, whereby the straight pipe portion (9) is in contact with the front and rear side edges of the plate fin (2).

  The first and second bent pipe portions (10), (11) of the defrosting pipe heater (8) are arranged inside the side plates (12), (13), and the defrosting pipe heater (8) The length in the front-rear direction of the plate fin (2) around the first bent pipe portion (10) is to avoid interference with the first bent pipe portion (10) of the defrosting pipe heater (8). It is short.

  As shown in FIG. 4, two front straight pipe parts (5) adjacent to the air flow direction of the heat exchange pipe (4) fixed to the plate fin (2) and the front side of the straight pipe part (5) are located. The positional relationship with the front straight pipe part (9) of the defrosting pipe heater (8) fitted in the heater fitting part (17) forming a triangle in side view was fixed to the plate fin (2). Two heat exchanger pipes (4) adjacent to the air flow direction in the rear straight pipe section (5) and the heater fitting section (17) located behind the straight pipe section (5) are removed. The positional relationship with the rear straight pipe portion (9) of the frost pipe heater (8) forms a triangle in side view.

  The straight pipe portion (9) of the defrosting pipe heater (8) is a fixture (18) located between the plate fins (2) adjacent in the left-right direction of the fin group (3) adjacent in the air flow direction ( It is fixed to the straight pipe part (5) of the heat exchange pipe (4) through 21).

  As shown in FIGS. 5 (a) and 5 (b), the front fixture (18) is an elastically deformable C that detachably holds the front straight pipe portion (9) of the defrosting pipe heater (8). The front holding part (19) with the opening facing the rear side, and the front holding part (19) integrally with the front holding part (19) at the upper end of the front holding part (19) It consists of a front holding part (19) and an elastically deformable front arm part (20) that extends obliquely downward and rearward integrally with the front holding part (19) at the lower tip part. (20) is formed with the same width. The tip of the front arm portion (20) has a curved shape so as to engage with the rear peripheral surfaces of two front straight pipe portions (5) adjacent to each other in the air flow direction of the heat exchange pipe (4). The foremost part of the front arm part (20) is folded back so as to make a U-turn to the rear side to form a reinforcing part (20a).

  The rear fixture (21) is an elastically deformable C-shape that detachably holds the rear straight pipe portion (9) of the defrosting pipe heater (8), and holds the rear side with the opening facing the front side. Part (22) and the rear holding part at the upper front end part of the rear holding part (22) and the rear holding part (22) integrally with the rear holding part (22) and the lower front end part of the rear holding part (22) (22) and an elastically deformable rear arm portion (23) that extends in an obliquely downward direction to the front, and the rear holding portion (22) and the rear arm portion (23) are the same. The width is formed. The tip of the rear arm (23) has a curved shape so as to engage with the front peripheral surfaces of two rear straight pipes (5) adjacent to each other in the air flow direction of the heat exchange pipe (4). . The most advanced part of the rear arm part (23) is folded back so as to make a U-turn to the front side to form a reinforcing part (23a).

  To fix the defrosting pipe heater (8) to the front straight pipe part (5) of the heat exchange pipe (4), the front holding part (19) is elastically deformed in the direction of widening the opening of the front holding part (19). The straight pipe part (9) of the defrosting pipe heater (8) is fitted into the front holding part (19). Next, the upper and lower front arm portions (20) provided on the front holding portion (19) are elastically deformed in a direction in which they approach each other. The front arm (20) is adjacent to the air flow direction in the heat exchange tube (20) so that the curved tip of the front arm (20) is located behind the front straight tube (5) of the heat exchange tube (4). 4) between the front straight pipe part (5) and the curved part at the tip of the front arm part (20) of the fixture (18) to the rear circumference of the front straight pipe part (5) of the heat exchange pipe (4). Engage with the surface.

  Similarly, to fix the defrosting pipe heater (8) to the rear straight pipe part (5) of the heat exchange pipe (4), the rear holding part in the direction of widening the opening of the rear holding part (22). The straight pipe part (9) of the defrosting pipe heater (8) is fitted into the rear holding part (22) while elastically deforming (22). Next, the upper and lower rear arm portions (23) provided on the rear holding portion (22) are elastically deformed in a direction in which they approach each other. Adjacent the rear arm (23) in the air flow direction so that the curved tip of the rear arm (23) is positioned in front of the rear straight pipe (5) of the heat exchange pipe (4). Insert it between the rear straight pipe part (5) of the exchange pipe (4) and connect the curved portion of the tip of the rear arm part of the fixture (18) to the rear straight pipe part (5) of the heat exchange pipe (4). Engage with the front peripheral surface of the.

  In this way, the defrosting pipe heater (8) can be fixed to the front and rear straight pipe portions (5) of the heat exchange pipe (4) via the fixture (18).

  The right side plate (12) includes a first bent pipe portion (6) of the heat exchange pipe (4) and a straight pipe portion (5) vertically adjacent to each other connected by the first bent pipe portions (6). A straight pipe portion (5) adjacent to the front and rear connected by a vertically long through hole (24) passing through the right end portion, the second bent pipe portion (7) of the heat exchange pipe (4) and the second bent pipe portion (7). A laterally long through hole (25) through which the right end portion of) passes is formed.

  The left side plate (13) includes a first bent pipe portion (6) of the heat exchange pipe (4) and straight pipe portions (5) adjacent to each other connected by the first bent pipe portions (6). A vertically long through hole (24) that passes through the left end, and a notch (26) that fits the left end of the upper straight pipe section (9) in both meandering pipe sections (8a) (8b) of the defrosting pipe heater (8) Is formed.

  As shown by the two-dot chain lines in FIGS. 1 and 2, walls (12a) and (12b) facing rightward are provided on the upper and lower and front and rear edges of the right side plate (12). The formed wall (12b) serves as an air blocking plate that blocks the flow of air from the upstream side to the downstream side.

  Of the first bent pipe part (6) provided side by side above and below the left side plate (13), the wall (13a) (13a) facing leftward is located above and below and below the first bent pipe part (6). 13b) is provided, and the upper and lower walls (13b) are air blocking plates that block the flow of air from the upstream side to the downstream side.

  The first and second bent pipe portions (6) and (7) of the heat exchange pipe (4) are provided so as to protrude outward from the right side plate (12) and the left side plate (13).

  Instead of being provided on the upper and lower edges of the right side plate (12), the air blocking plate (12b) of the right side plate (12) is, for example, the lower side of the vertically long through-holes (24) provided side by side. May be provided between the vertically long through hole (24) and the horizontally long through hole (25).

  The evaporator (1) constitutes a refrigeration cycle together with a compressor and a condenser. Such a refrigerating cycle is arrange | positioned in the heat insulation box of a refrigerator.

  In the evaporator (1), the refrigerant flows into the heat exchange pipe (4) from the left end of the straight pipe section (5) at the upper end of the front meandering pipe section of the heat exchange pipe (4), and the heat exchange pipe (4 ), And exchanges heat with the air flowing upward from below as indicated by an arrow X in FIG. 1, and the straight pipe portion (5 at the upper end of the rear meandering pipe portion of the first heat exchange pipe (4) ) From the left end.

  And the outer peripheral surface of the portion that passes through each plate fin (2) in the straight pipe portion (5) of the heat exchange pipe (4), the through-hole through which the straight pipe portion (5) in each plate fin (2) passes Although frost formation occurs in the vicinity of (14) and in the vicinity of the portion where the straight pipe portion (9) is in contact with the plate fin (2), the outer surface of the heat exchange pipe (4) and the plate fin ( When frost is generated in 2), it is defrosted by the defrosting pipe heater (8).

  By the way, like the pipe heater for defrosting provided in the conventional evaporator, the bent pipe part of the pipe heater for defrosting the frost adhering to the plate fin is passed through each side plate and the outside of the side plate. If it protrudes to the right, the electric power accompanying the heat generation of the bent pipe portions (10) and (11) of the defrosting plate fin (8) is wasted.

  Therefore, like the evaporator (1) of the present invention, the bent pipe portions (10) and (11) of the defrosting pipe heater (8) are provided so as to be located inside the both side plates (12) and (13). In this case, it is possible to prevent waste of electric power due to heat generation of the bent pipe portions (10) and (11) of the defrosting pipe heater (8).

  Further, the longitudinal length of the plate fin (2) around the bent pipe part (10) of the defrosting pipe heater (8) is interfered with the bent pipe part (10) of the defrosting pipe heater (8). Therefore, the interference between the front and rear edges of the plate fin (2) and the bent pipe portion (10) of the defrosting pipe heater (8) can be avoided.

  In the above embodiment, the fin pitch between adjacent plate fins (2) of the fin group (3) on the downstream side (upper side) in the air flow direction is the same as that of the fin group (3) on the upstream side (lower side) in the air flow direction. Although it is smaller than the fin pitch, the present invention is not limited to this, and the fin pitch of all the fin groups (3) may be equal.

  The evaporator according to the present invention is suitably used for a refrigeration cycle used in a refrigeration / refrigeration apparatus such as a refrigerator, a refrigerated showcase, a freezer, and a refrigerated showcase.

(1): Evaporator (2): Plate fin (3): Fin group (4): Heat exchange pipe (5): Straight pipe part (6) (7): Bent pipe part (8): Pipe heater for defrosting (9): Straight pipe part (10) (11): Bent pipe part (12) (13): Side plate (16): Notch (17): Heater insertion part (18) (21): Fixing tool

Claims (3)

A plurality of fins composed of a plurality of plate fins arranged in parallel in the left-right direction, and a plurality of fins provided at intervals in the up-down direction, and a plurality of laterally extended fins fixed to the plate fins of each fin group A heat exchange pipe that connects a straight pipe section and two adjacent straight pipe sections and includes one less bent pipe section than the straight pipe section, and a plurality of straight pipe sections extending in the left-right direction and two adjacent straight pipes An evaporator comprising a pipe heater for defrost consisting of a number of bent pipe parts that is one less than the straight pipe part, and side plates arranged on the outer sides in the left and right direction of all fin groups,
The bent pipe portion of the defrosting pipe heater is disposed inside the both side plates, and the length of the plate fin in the front-rear direction around the bent pipe portion of the defrosting pipe heater is the bent pipe portion of the defrosting pipe heater. The heat exchange pipe is shortened so as to avoid contact with the heat exchanger pipe via a fixture in which the straight pipe portion of the defrosting pipe heater is located between the plate fins adjacent in the left-right direction of the fin group adjacent in the air flow direction. The evaporator is fixed to the straight pipe part.
Front straight pipe of a defrosting pipe heater fitted in two front straight pipe parts adjacent to the air flow direction of the heat exchange pipe fixed to the plate fin and a heater fitting part located in front of the straight pipe part The two rear straight pipe portions adjacent to each other in the air flow direction of the heat exchange tubes fixed to the plate fins and the heaters located on the rear side of the straight pipe portions. The positional relationship with the rear straight pipe portion of the defrosting pipe heater fitted in the fitting portion for use forms a side view triangle,
The front-side fixture is an elastically deformable C-shape that detachably holds the front-side straight pipe portion of the defrosting pipe heater, and a front-side holding portion with the opening facing the rear side, and an upper end portion of the holding portion It consists of an elastically deformable front arm extending integrally with the holding portion in the rear obliquely upward direction and a lower distal end portion of the holding portion extending integrally with the holding portion in the rear obliquely downward direction, and the tip of the front arm portion is heated. A curved shape is formed so as to engage with the rear peripheral surface of the front straight pipe portion adjacent in the air flow direction of the exchange pipe,
With the front holding part holding the front straight pipe part of the defrosting pipe heater, the front arm part is engaged with the rear peripheral surface of the front straight pipe part adjacent in the air flow direction of the heat exchange pipe, respectively. The front straight pipe part of the pipe heater for defrosting is fixed to the front straight pipe part of the heat exchange pipe via a fixture,
The rear fixture is an elastically deformable C-shape that detachably holds the rear straight pipe portion of the defrosting pipe heater, and a rear holding portion with the opening facing forward, and an upper end of the holding portion The rear arm part is composed of an elastically deformable rear arm extending integrally with the holding part at the front and obliquely upward in the forward direction and at the lower end part of the holding part and extending at the front obliquely downward with the holding part. The tip of is curved so that it engages with the front peripheral surface of the rear straight pipe part adjacent to the air flow direction of the heat exchange pipe,
With the rear holding part holding the rear straight pipe part of the defrosting pipe heater, the rear arm part is engaged with the front peripheral surface of the rear straight pipe part adjacent to the air flow direction of the heat exchange pipe, respectively. The evaporator according to claim 1, wherein the rear straight pipe portion of the defrosting pipe heater is fixed to the rear straight pipe portion of the heat exchange pipe via a fixture.
The straight pipe part of the heat exchange pipe is fixed to the side plate, and the front and rear side edges of both side plates are provided with walls facing in the opposite direction to each other, and air flows between the walls provided on the front and rear sides of the side plate. The evaporator according to claim 1, further comprising an air blocking plate that blocks the air.

Images