A modular energy-saving air-cooled refrigerator for small units

Abstract

The present invention relates to the field of refrigeration equipment, specifically a small unit modular energy-saving air-cooled freezer, comprising: a box body, a freezer, a support part and an air connection duct; a refrigeration box is arranged on one side of the top of the freezer, the cross section of the refrigeration box is approximately "L" shaped, and an air outlet is arranged on one side of the upper part of the refrigeration box; at least one installation room for installing the freezer is arranged on one side of the box body, and a support part adapted to one end of the refrigeration box is slidably installed in the installation room; an air connection duct adapted to the air outlet is arranged on the inner side wall of the installation room, and a vent hole connected to the refrigeration room is arranged on one side of the air connection duct, and the air connection duct is a telescopic tube and the movable end is connected to the support part through a transmission mechanism. The present invention proposes a small unit modular energy-saving air-cooled freezer, which is easy to position and install and has high sealing performance.

Description

Technical Field

[0001] The invention relates to the field of refrigeration equipment, and in particular to a small unit modular energy-saving air-cooled refrigerator. Background Art

[0002] The small unit air-cooled freezer unit is an integrated refrigeration equipment based on modular technology, with air as the medium and as the cold source. Compared with the integral freezer, the small unit air-cooled freezer is smaller in size and the modular air-cooled freezer has the advantages of fast cooling speed, uniform temperature, and energy saving through integrated control. In the prior art, the small unit modular energy-saving air-cooled freezer is usually used in conjunction with a storage refrigeration box, that is, the required number of small unit modular energy-saving air-cooled freezers are loaded into the box, and then the cold air is passed into the box through the small unit modular energy-saving air-cooled freezer to refrigerate the stored items during the period. However, the existing small unit modular energy-saving air-cooled freezers have the following problems in the installation and sealing processes: 1. The installation process between the freezer and the box is extremely cumbersome and complicated. 2. The sealing connection between the air pipe of the freezer and the box is poor, which is easy to cause cold air leakage and affect energy consumption. Summary of the invention

[0003] The present invention provides a small unit modular energy-saving air-cooled freezer which is easy to position and install and has high sealing performance, so as to solve the problems raised in the above-mentioned background technology.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A small unit modular energy-saving air-cooled freezer, comprising: a box body, a freezer, a support part and an air connection duct; a refrigeration box is arranged on one side of the top of the freezer, the cross section of the refrigeration box is approximately "L"-shaped, and an air outlet is arranged on one side of the upper part of the refrigeration box; at least one installation room for installing the freezer is arranged on one side of the box body, and a support part adapted to one end of the refrigeration box is slidably installed in the installation room; an air connection duct adapted to the air outlet is arranged on the inner side wall of the installation room, and a vent hole connected to the refrigeration chamber is arranged on one side of the air connection duct, and the air connection duct is a telescopic tube and the movable end is connected to the support part by a transmission mechanism; when the freezer is installed in the installation room, the support part can overlap one end of the refrigeration box and move therewith, and when the freezer is installed, the movable end of the air connection duct is fully extended and close to the air outlet on the refrigeration box.

[0006] As a preferred solution of the present invention, the refrigerator also includes a frame, a refrigeration assembly is arranged on the bottom surface of the frame, and the refrigeration assembly includes: a condenser, a condensing fan and a compressor; supports are arranged at intervals at the bottom of the frame, and one side of the top of the frame is fixedly connected to one end of the refrigeration box through a mounting plate.

[0007] As a preferred solution of the present invention, one side of the bottom of the refrigeration box is open, and an evaporator is arranged at the opening. An evaporating fan is arranged at the top of the refrigeration box, and the blowing end faces the air outlet.

[0008] As a preferred solution of the present invention, a top plate is provided on the top of the installation room, a partition plate is provided in the middle, an installation frame adapted to the installation plate is provided between the top plate and the partition plate, a transmission mechanism is provided in the top plate, a reset mechanism is provided in the partition plate, and sliding grooves adapted to the supports are provided at intervals on the bottom surface of the installation room.

[0009] As a preferred solution of the present invention, the transmission mechanism includes a first screw rod and a second screw rod which are rotatably installed, the ends of the first screw rod and the second screw rod are connected by a bevel gear transmission, a first sliding seat is movably installed on the first screw rod, and a second sliding seat is movably installed on the second screw rod, the lower part of the first sliding seat is connected to the movable end of the air connecting pipe through a movable connecting piece, and the lower part of the second sliding seat is connected to the support part through a connecting rod.

[0010] As a preferred solution of the present invention, the support part includes a limit plate, one end of which is fixedly connected to the connecting rod, and the bottom of the other end of the limit plate is provided with a bottom plate adapted to the bottom of the refrigeration box, and side plates adapted to the side walls of the refrigeration box are provided on both sides of the bottom plate.

[0011] As a preferred solution of the present invention, the length and height of the side panel close to the side where the evaporator fan in the refrigeration box is located are greater than those of the side panel close to the side where the evaporator in the refrigeration box is located.

[0012] As a preferred solution of the present invention, a flexible sealing pad is provided on the end surface of the movable end of the air connection pipe.

[0013] As a preferred solution of the present invention, the reset mechanism includes a rotatably mounted third screw rod, on which a third sliding seat is movably mounted, one end of the third screw rod is provided with a rotating self-resetting device, and the upper part of the third sliding seat is connected to the support part through a connecting rod.

[0014] As a preferred solution of the present invention, the movable connecting member includes a rear connecting part connected to the first sliding seat, a front connecting part connected to the movable end of the air connection pipe is slidably installed in the rear connecting part, and a spring is arranged between the front connecting part and the rear connecting part. The beneficial effects of the present invention are:

[0015] 1. Through the arrangement of the support part and the cooperation with the refrigeration box, it can play a role in positioning and guiding the installation when the refrigerator is installed into the box body, simplifying the installation process; when the refrigerator is installed, it can support the refrigeration box, making the device more stable.

[0016] 2. Through the arrangement of the air duct and the cooperation with the supporting part, when the refrigerator is completely loaded into the box body, the air inlet movable port of the air duct will be close to the air outlet of the refrigerator refrigeration box under the drive of the supporting part, thereby improving the sealing effect of the device, avoiding the leakage of cold air and reducing energy consumption.

[0017] 3. By squeezing the air outlet of the refrigeration box with the movable end of the air duct and cooperating with the side of the support part, the installed refrigeration box is clamped, which further improves the fixing effect of the device. At the same time, through the multi-directional support and clamping of the device, the negative impact of vibration on the refrigeration box during operation is reduced, and the sealing effect is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view structural schematic diagram of the box body of the present invention.

[0019] Figure 2 It is a front view structural schematic diagram of the refrigerator of the present invention.

[0020] Figure 3 It is a partial cross-sectional front view structural schematic diagram of the box installation chamber of the present invention.

[0021] Figure 4 It is a partial cross-sectional front view of the structure of the box installation room of the present invention in an installed state.

[0022] Figure 5 It is a schematic diagram of the side cross-sectional structure of the box body of the present invention.

[0023] Figure 6 It is a schematic diagram of the side cross-sectional structure of the box body of the present invention in the installed state.

[0024] Figure 7 It is an enlarged cross-sectional structural schematic diagram of point A of the present invention.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the support part of the present invention.

[0026] The text annotations in the figure represent: 1. Box body; 11. Installation chamber; 111. Top plate; 112. Partition plate; 113. Ventilation hole; 114. Slide groove; 115. Installation frame; 12. Refrigeration chamber; 2. Refrigeration cabinet; 21. Rack; 22. Condenser; 23. Condensing fan; 24. Compressor; 25. Installation plate; 26. Refrigeration box; 261. Evaporator; 262. Evaporating fan; 263. Air outlet; 27. Support; 3. Support part; 31. Bottom plate; 32. Limit plate; 33. Side plate; 4. Transmission mechanism; 41. First screw rod; 42. First sliding seat; 43. Second sliding seat; 44. Second screw rod; 5. Air duct; 6. Reset mechanism; 61. Third sliding seat; 62. Third screw rod; 63. Rotary self-reset device; 7. Movable connecting piece; 71. Rear connecting part; 72. Front connecting part; 73. Spring. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0028] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0029] like Figure 1-8As shown, a small unit modular energy-saving air-cooled freezer comprises: a box body 1, a freezer 2, a support portion 3 and an air connection duct 5; a refrigeration box 26 is fixedly installed on one side of the top of the freezer 2, and the cross-section of the refrigeration box 26 is approximately "L"-shaped, and an air outlet 263 is arranged on one side of the upper part of the refrigeration box 26, and the refrigeration box 26 will blow out refrigerated air from the air outlet 263; at least one installation chamber 11 for installing the freezer 2 is arranged on one side of the box body 1, that is, the freezer 2 can be detachably installed in the installation chamber 11, and a support portion 3 adapted to one end of the refrigeration box 26 is slidably installed in the installation chamber 11, and the sliding stroke of the support portion 3 is adapted to the loading and moving process of the refrigeration box 26; an air connection duct adapted to the air outlet 263 is arranged on the inner side wall of the installation chamber 11 5, a vent hole 113 communicating with the refrigerating chamber 12 is provided on one side of the air connection pipe 5, that is, the refrigerating gas blown out of the air outlet 263 will pass through the air connection pipe 5 and blow into the refrigerating chamber 12 from the vent hole 113, the air connection pipe 5 is a telescopic pipe and the movable end is connected to the support part 3 through a transmission mechanism 4, and the telescopic pipe is a sealed hard telescopic air pipe; when the refrigerator 2 is installed in the installation chamber 11, the support part 3 will first overlap one end of the refrigerating box 26 and move as the installation of the refrigerator 2 deepens, that is, the refrigerating box 26 pushes the support part 3 to move, and the movement of the support part 3 will drive the movable end of the air connection pipe 5 to extend and retract through the transmission device 4, and when the installation of the refrigerator 2 is completed, the movable end of the air connection pipe 5 is fully extended and close to the air outlet 263 on the refrigerating box 26, completing the docking and fixation of the air outlet.

[0030] like Figure 2 As shown, further, the refrigerator 2 also includes a frame 21, and a refrigeration assembly is arranged on the inner bottom surface of the frame 21, and the refrigeration assembly includes: a condenser 22, a condensing fan 23 and a compressor 24, and the condensing fan 23 is installed on one side of the condenser 22; a pair of supports 27 are arranged at intervals at the bottom of the frame 21, and the refrigerator 2 can be placed stably by the supports 27, and one side of the top of the frame 21 is fixedly connected to one end of the refrigeration box 26 through a mounting plate 25.

[0031] like Figure 4 As shown, further, one side of the bottom of the refrigeration box 26 is open, and an evaporator 261 is provided at one side of the opening at the bottom of the refrigeration box 26, and an evaporation fan 262 is provided at the top of the refrigeration box 26. The evaporation fan 262 is a perfusion fan in this embodiment, and the blowing end faces the air outlet 263.

[0032] Specifically, the refrigeration box 26 will suck air from the opening of the refrigeration box 26 through the evaporation fan 262, and exhaust it through the air outlet 263 after passing through the evaporator 261.

[0033] like Figure 3-6As shown, further: a top plate 111 is provided on the top of the installation chamber 11, a partition plate 112 is provided in the middle, a mounting frame 115 adapted to the installation plate 25 is provided between the top plate 111 and the partition plate 112, the installation plate 25 and the installation frame 115 are detachably fixedly connected by bolts, a transmission mechanism 4 is provided in the top plate 111, a reset mechanism 6 is provided in the partition plate 112, and slide grooves 114 adapted to the support 27 are provided at intervals on the bottom surface of the installation chamber 11.

[0034] Specifically, through the cooperation between the slide groove 114 and the support 27, the refrigerator 2 can be more conveniently installed in the installation chamber 11 by sliding, and through the cooperation between the installation frame 115 and the installation plate 25, the refrigerator 2 can be further conveniently fixed and positioned.

[0035] like Figure 3-6 As shown, further, the transmission mechanism 4 includes a first screw rod 41 and a second screw rod 44 which are rotatably installed. The ends of the first screw rod 41 and the second screw rod 44 are connected through a bevel gear transmission. A first sliding seat 42 is movably installed on the first screw rod 41, and a second sliding seat 43 is movably installed on the second screw rod 44. The lower part of the first sliding seat 42 is connected to the movable end of the air connection pipe 5 through a movable connecting piece 7, and the lower part of the second sliding seat 43 is connected to the support part 3 through a connecting rod.

[0036] Specifically, the moving direction of the first sliding seat 42 matches the telescopic direction of the air connection duct 5 , and the moving direction of the second sliding seat matches the moving direction of the refrigeration box 26 when the freezer 2 is installed into the box body 1 .

[0037] like Figure 4 , Figure 6 , Figure 8 As shown, further, the support portion 3 includes a limit plate 32, one end of the limit plate 32 is fixedly connected to the connecting rod, and the bottom of the other end of the limit plate 32 is provided with a bottom plate 31 adapted to the bottom of the refrigeration box 26, and side plates 33 adapted to the side walls of the refrigeration box 26 are provided on both sides of the bottom plate 31. The size of the side plate 33 is limited by the size of the side wall of the refrigeration box 26 adapted thereto, and the space enclosed by the bottom plate 31, the limit plate 32, and the side plate 33 can just accommodate one end of the refrigeration box 26 installed on the overlap.

[0038] like Figure 8 As shown, further, the length and height of the side plate 33 close to the side where the evaporating fan 262 in the refrigerating box 26 is located are greater than those of the side plate 33 close to the side where the evaporator 261 in the refrigerating box 26 is located.

[0039] Specifically, when one end of the air connection pipe 5 is pressed against the air outlet 263 of the refrigeration box 26, a lateral thrust will be applied to the refrigeration box 26, and the corresponding larger side panel 33 on the other side will share the pressure and provide reverse support, further facilitating the clamping and fixing of the refrigeration box 26 by the support part 3 and the air connection pipe 5 in the installed state.

[0040] like Figure 3 , Figure 4 As shown, further, a flexible sealing pad is arranged on the end surface of the movable end of the air connection pipe 5. By arranging the flexible sealing pad, the sealing effect of the device can be further improved.

[0041] like Figure 5 , Figure 6 As shown, further, the reset mechanism 6 includes a rotatably mounted third screw rod 62, on which a third sliding seat 61 is movably mounted, and one end of the third screw rod 62 is provided with a rotational self-resetting device 63, in which a reset torsion spring is provided, and the reset is completed by the torsion spring restoration, and the upper part of the third sliding seat 61 is connected to the support part 3 through a connecting rod. Through the setting of the reset mechanism 6, the support part 3 can be restored to its original position after the refrigerator 2 is disassembled, so as to facilitate the next installation.

[0042] like Figure 7 As shown, further, the movable connecting member 7 includes a rear connecting portion 71 connected to the first sliding seat 42, a front connecting portion 72 connected to the movable end of the air connection pipe 5 is slidably installed in the rear connecting portion 71, and a spring 73 is arranged between the front connecting portion 72 and the rear connecting portion 71.

[0043] Specifically, when the end of the air connection pipe 5 is pressed against the air outlet 263, there will be relative movement between the rear connection part 71 and the front connection part 72 in the movable connection part 7, and the spring 73 will be compressed. Through the cooperation of the spring 73 and the flexible sealing gasket, the refrigeration box 26 can maintain a sealed connection state with the air connection pipe 5 and a clamping state with the supporting part 3 during working vibration.

[0044] Working principle: When using the device, the items to be refrigerated are placed in the refrigerating chamber 12 of the box body 1, and the refrigerator 2 is installed in the installation chamber 11; the compressor 24 is started to cooperate with the condenser 22, the evaporator 261 and other devices to start refrigeration (the conventional principle of the refrigeration device is the prior art and will not be described in detail), and the cold air is discharged from the air outlet 263 through the evaporating fan 262 in the refrigerating box 26, and enters the refrigerating chamber 12 from the vent 113 through the air connection pipe 5 to start refrigeration; during the installation process of the refrigerator 2, The refrigeration box 26 will enter the installation chamber 11 between the top plate 111 and the partition plate 112, and one end of the refrigeration box 26 will overlap the support part 3 and push the support part 3 to move into the installation chamber 11. In this process, the support part 3 will play a role in positioning and guiding. The movement of the support part 3 will drive the upper second sliding seat 43 and the lower third sliding seat 61 to slide synchronously through the connecting rod. The movement of the second sliding seat 43 will drive the second screw rod 44 to rotate, and the second screw rod 44 drives the first screw rod 41 to rotate through the bevel gear transmission. The rotation of the first screw rod 41 will drive the first sliding seat 42 to slide axially along the first screw rod 41, and the first sliding seat 42 drives the movable end of the air duct 5 to extend through the movable connecting piece 7; at the same time, the sliding of the third sliding seat 61 also drives the third screw rod 62 to rotate and accumulates restoring force in the rotating self-resetting device 63 connected thereto; until the refrigerator 2 is installed, the support part 3 stops moving, and it overlaps the end of the refrigeration box 26 away from the installation plate 25 to provide vertical support force. At this time, the connecting The movable end of the air duct 5 is also fully extended and pressed against the air outlet 263, completing the connection of the air path, and cooperating with the support part 3 to complete the horizontal clamping and fixing of the refrigeration box 26; and when one end of the air duct 5 is pressed against the air outlet 263 of the refrigeration box 26, a lateral thrust will be applied to the refrigeration box 26, and the corresponding larger side plate 33 located on the other side of the refrigeration box 26 will share the pressure and provide reverse support, further facilitating the clamping and fixing of the refrigeration box 26 by the support part 3 and the air duct 5 in the installed state. Considering the working vibration of the refrigeration box 26, the movable connecting member 7 can keep the refrigeration box 26 in a sealed connection state with the air duct 5 and cooperate with the clamping state of the support part 3 during the working vibration through the cooperation of the spring 73 and the flexible sealing pad. When the refrigerator 2 is finished working or dismantled, the restoring force of the torsion spring in the rotating self-resetting device 63 will drive the third screw rod 62 to rotate in the opposite direction, and the third screw rod 62 will drive the third sliding seat 61 to return to the original path, drive the support part 3 to return to the original position and the movable end of the air connection duct 5 to retract, and the device is reset.

[0045] During the above-mentioned whole process, the device can play a role of positioning and guiding installation when the refrigerator 2 is loaded into the box body 1 through the arrangement of the support part 3 and the cooperation of the refrigeration box 26, thereby simplifying the installation process; when the refrigerator 2 is installed, it can play a role of supporting the refrigeration box 26 in the vertical direction, making the device more stable; through the arrangement of the air connection pipe 5 and the cooperation of the support part 3, when the refrigerator 2 is completely loaded into the box body 1, the air inlet active port of the air connection pipe 5 will be close to the air outlet 263 of the refrigeration box 26 of the refrigerator 2 under the drive of the support part 3, thereby improving the sealing effect of the device, avoiding the leakage of cold air and reducing energy consumption; through the squeezing of the air outlet 263 of the refrigeration box 26 by the active end of the air connection pipe 5 and the cooperation of the side 33 of the support part 3, the installed refrigeration box 26 is clamped, thereby further improving the fixing effect of the device, and at the same time, through the multi-directional support and clamping of the device, the negative impact caused by the vibration of the refrigeration box 26 during operation is reduced, thereby further improving the sealing effect.

[0046] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method of the present invention and its core idea. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements, modifications or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A small unit modular energy-saving air-cooled refrigerator, characterized in that: include: A box body (1), a refrigerator (2), a support portion (3), and an air connection duct (5); a refrigeration box (26) is arranged on one side of the top of the refrigerator (2); the cross section of the refrigeration box (26) is approximately "L"-shaped; an air outlet (263) is arranged on one side of the upper part of the refrigeration box (26); one side of the bottom of the refrigeration box (26) is open, and an evaporator (261) is arranged at the opening; an evaporating fan (262) is arranged at the top of the refrigeration box (26), and the air blowing end faces the air outlet (263); at least one installation room (11) for installing the refrigerator (2) is arranged on one side of the box body (1); ), a support portion (3) adapted to one end of the refrigerating box (26) is slidably mounted in the installation chamber (11); an air connection pipe (5) adapted to the air outlet (263) is arranged on the inner side wall of the installation chamber (11); a vent (113) communicating with the refrigerating chamber (12) is arranged on one side of the air connection pipe (5); the air connection pipe (5) is a telescopic pipe and the movable end is connected to the support portion (3) by a transmission mechanism (4); when the refrigerator (2) is installed in the installation chamber (11), the support portion (3) can overlap one end of the refrigerating box (26) and move therewith; when the refrigerator (2) is installed When the air connection pipe (5) is formed, the movable end of the air connection pipe (5) is fully extended and closely attached to the air outlet (263) on the refrigeration box (26); the transmission mechanism (4) comprises a first screw rod (41) and a second screw rod (44) which are rotatably mounted, the ends of the first screw rod (41) and the second screw rod (44) being connected by a bevel gear transmission, a first sliding seat (42) being movably mounted on the first screw rod (41), a second sliding seat (43) being movably mounted on the second screw rod (44), the lower part of the first sliding seat (42) being connected to the movable end of the air connection pipe (5) by a movable connecting member (7), and the second sliding seat (43) being movably mounted on the second screw rod (44). The lower part of the movable seat (43) is connected to the support part (3) via a connecting rod; the support part (3) comprises a limit plate (32), one end of the limit plate (32) is fixedly connected to the connecting rod, the other end of the limit plate (32) is provided with a bottom plate (31) adapted to the bottom of the refrigeration box (26), and side plates (33) adapted to the side walls of the refrigeration box (26) are provided on both sides of the bottom plate (31); the length and height of the side plate (33) close to the side where the evaporating fan (262) in the refrigeration box (26) is located are greater than those of the side plate (33) close to the side where the evaporator (261) in the refrigeration box (26) is located.

2. A small unit modular energy-saving air-cooled freezer according to claim 1, characterized in that: The refrigerator (2) further comprises a frame (21), a refrigeration assembly being arranged on the inner bottom surface of the frame (21), the refrigeration assembly comprising: a condenser (22), a condensing fan (23) and a compressor (24); a support (27) is arranged at intervals at the bottom of the frame (21), and one side of the top of the frame (21) is fixedly connected to one end of a refrigeration box (26) via a mounting plate (25).

3. A small unit modular energy-saving air-cooled freezer according to claim 2, characterized in that: A top plate (111) is arranged at the top of the installation chamber (11), a partition plate (112) is arranged in the middle, an installation frame (115) adapted to the installation plate (25) is arranged between the top plate (111) and the partition plate (112), a transmission mechanism (4) is arranged in the top plate (111), a reset mechanism (6) is arranged in the partition plate (112), and sliding grooves (114) adapted to the support (27) are arranged at intervals on the bottom surface of the installation chamber (11).

4. A small unit modular energy-saving air-cooled freezer according to claim 1, characterized in that: A flexible sealing pad is provided on the end surface of the movable end of the air connection pipe (5).

5. A small unit modular energy-saving air-cooled freezer according to claim 3, characterized in that: The reset mechanism (6) comprises a rotatably mounted third screw rod (62), a third sliding seat (61) being movably mounted on the third screw rod (62), a rotating self-reset device (63) being provided at one end of the third screw rod (62), and an upper portion of the third sliding seat (61) being connected to the support portion (3) via a connecting rod.

6. A small unit modular energy-saving air-cooled freezer according to claim 1, characterized in that: The movable connecting member (7) comprises a rear connecting portion (71) connected to the first sliding seat (42), a front connecting portion (72) connected to the movable end of the air connection pipe (5) being slidably mounted in the rear connecting portion (71), and a spring (73) being provided between the front connecting portion (72) and the rear connecting portion (71).

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