CN113483520B - Cold volume and wind volume controllable food refrigerating and fresh-keeping storage box - Google Patents

Abstract

The invention discloses a food cold storage and fresh-keeping storage box capable of controlling cold quantity and air quantity, which comprises a storage box, a condenser, a heat-insulating plate, expansion and contraction components and a cross air guide box, wherein the left side, the right side, the upper side and the lower side of the storage box are respectively provided with a longitudinal lifting device and a transverse moving device, the inner sides of the storage box are respectively provided with the heat-insulating plate which is parallel to the storage box, the cross air guide box is used for connecting a plurality of groups of expansion and contraction components, the interior of the storage box is divided into four groups of storage chambers, each group of storage chambers is provided with an independent exhaust channel, the heat-insulating plate is provided with a strip-shaped sliding cavity, a half cross air guide box is embedded into the strip-shaped sliding cavity, the outer side ends of the expansion and contraction components of the half cross air guide box are connected, the interior of a shell at the upper end of the storage box is provided with the condenser, the output end of the condenser is communicated with an air guide tube arranged in the center of the air guide box through a pipeline, the exhaust passage is communicated with the input end of the condenser, and the left side of the condenser is provided with a regulation and control screen.

Description

A food refrigeration and fresh-keeping storage box with controllable cooling capacity and air volume

technical field

The invention relates to the technical field of food refrigeration, in particular to a food refrigeration and fresh-keeping storage box with controllable refrigeration capacity and air volume.

Background technique

During the refrigeration process, the storage temperature, relative humidity and flow rate of the air are important condition factors for refrigeration. In practical applications, the specific conditions of these three are determined with the different types of food, the length of storage period and whether the food is packaged. The storage temperature, especially the temperature of the food itself, is the most important factor. For fruits, vegetables and shell eggs, it is generally better to be close to the freezing point. For example, the minimum storage temperature of bananas, pineapples, lemons, green tomatoes, cucumbers, and eggplants is 13, 7, 12, 12, 7, and 7°C, respectively. Below this temperature, low-temperature damage will occur, such as lesions and internal discoloration. The outer skin rots until it is completely festered; if the air humidity is too high, it is easy to produce condensed water on the surface of the low-temperature food, which may cause the fruits and vegetables to become moldy or sticky and moldy; The egg air chamber is enlarged and the weight is reduced. In the existing food refrigeration process, the same storage temperature is directly used for some foods, which cannot accurately refrigerate each type of food, and the air humidity on the surface of the food cannot be well regulated, so the refrigerated food cannot be refrigerated. quality is significantly reduced.

Therefore, those skilled in the art provide a food refrigerating and fresh-keeping storage box with controllable cooling capacity and air volume, so as to solve the problems raised in the above-mentioned background art.

SUMMARY OF THE INVENTION

In order to achieve the above purpose, the present invention provides the following technical solutions: a food refrigeration and fresh-keeping storage box with controllable cooling capacity and air volume, which includes a storage box, a condenser, a thermal insulation board, an expansion and contraction assembly and a cross air guide box, the storage The left and right sides of the box and the upper and lower side shells are respectively installed with longitudinal lifting devices and lateral moving devices, and the inner side of the box is provided with a parallel thermal insulation board. The cross air guide box is used for the connection of multiple sets of the expansion and contraction components. The expansion and contraction components are provided in four groups and have a cross-shaped structure, which divides the interior of the storage box into four groups of storage rooms, and each group of the storage rooms is provided with an independent exhaust channel;

A strip-shaped sliding cavity is opened on the insulation board, a semi-cross air guide box is embedded in the strip-shaped sliding cavity, and a flexible sealing strip is installed on the plate wall outside the remaining gap, and the semi-cross air guide box is installed. The outer ends of the expansion and contraction assemblies are connected;

The upper shell of the storage box is provided with a condenser, the output end of the condenser is connected with the air guide pipe arranged in the center of the cross air guide box and the half cross air guide box through a pipeline, and the exhaust channel is connected to the input of the condenser. The ends are connected, and a control screen is installed on the left side of the condenser.

As a preferred technical solution of the present invention, the expansion/contraction assembly includes a concave jacket seat, a telescopic rod 1, an I-shaped seat, a fixed plate sleeve and a fixed plate. The concave jacket seat has a left-right symmetrical structure, and its groove A transverse telescopic rod 1 is fixed on the wall, and the output ends of the telescopic rod 1 on the left and right sides are respectively fixed on the left and right side plates of the I-shaped seat. Symmetrical sliding chambers are provided on the left and right ends of the inner plate sleeve, and fixed plates are slidably connected inside the sliding chambers, and the left and right ends of the fixed plates on the left and right sides are fixed on the concave jacket seat;

And a drainage regulating device is installed at the center panel of the fixed plate sleeve in the longitudinal expansion and contraction assembly.

As a preferred technical solution of the present invention, diffuser components are installed at the four corner ends of the cross air guide box, and they all form an included angle of 45° with the horizontal plane. The side wall is provided with a corresponding air diffuser;

The diffuser assembly includes a drainage fan 1, a diffusion plate, a telescopic rod 2, a dispersing plate frame and a drainage plate bracket. The drainage fan 1 is arranged corresponding to the air diffuser. The front of the drainage fan 1;

Two independently adjustable telescopic rods are installed on the left and right sides of the drainage fan 1;

The diffuser plate is a telescopic structure, and three groups are arranged, which are connected to each other to form a three-sided air diffusion direction, and each group of the diffuser plate is installed with a drainage plate frame, which is linearly arranged along the surface of the diffuser plate, and all are one-way counterclockwise. Rotating, the left two sets of diffuser plates are hingedly connected to the two output ends of the left telescopic rod, and the right two sets of diffuser plates are hinged to the two output ends of the right telescopic rod.

As a preferred technical solution of the present invention, the drainage control device includes a square block, a drainage plate shell, a U-shaped seat, a third telescopic rod, a second air guide tube and a control assembly, and the square block is fixed on the left and right fixing plate sleeves , the guide plate shell is hingedly connected to the right side wall of the square block, the three upper and lower ends of the telescopic rod are hingedly connected with the upper end of the guide plate shell and the U-shaped seat fixed on the upper end surface of the square block, and are arranged symmetrically up and down;

And the upper and lower parallel drainage plate frames are installed on the right side plate of the drainage plate shell, the second air guide pipe is installed in the center of the square block, and the second air guide pipe is provided with multiple groups of air guide ports;

The guide plate shell is provided with horizontal regulating components, and multiple groups are arranged in a vertical and parallel arrangement, and the guiding pipes in each group of the regulating components are communicated with the air guiding ports through pipes.

As a preferred technical solution of the present invention, the control assembly includes a second drainage fan, a fixed annular tube, a rotating annular tube, a driving shaft, an elastic band and a swing plate, and the second drainage fan is installed at the right port of the drainage tube , the left and right side walls of the fixed ring-shaped pipe are provided with a 90° air guide port, and the left end of the guide pipe is sealed with the air guide port on the right side of the fixed ring-shaped pipe;

The inside of the fixed annular tube is coaxially connected with a rotating annular tube, the axis of the rotating annular tube is fixedly connected with the drive shaft, and the left and right side walls of the US Oshu rotating annular tube are also provided with air guides with a size of 90°;

The upper and lower ends of the air guide port on the left side of the fixed ring-shaped tube are connected with elastic bands, the left end of the elastic band is connected with the right end of the swing plate, the center of the swing plate is fixed on the shaft center of the large gear, and the upper and lower large gears are meshed and connected with each other. There are also two groups of pinions that are meshed with each other between the adjacent regulating components, the pinions and the large gears are meshed with each other, and the pinion located at the uppermost end is the main driving gear.

As a preferred technical solution of the present invention, the upper and lower three telescopic rods drive the guide plate shell to incline left and right by 15°.

As a preferred technical solution of the present invention, the hinge structure at the right end of the elastic band is an elastic winding structure.

As a preferred technical solution of the present invention, the length of the fixing plate sleeve is twice the length of the fixing plate.

Compared with the prior art, the present invention provides a food refrigeration and fresh-keeping storage box with controllable cooling capacity and air volume, which has the following beneficial effects:

1. In the present invention, the internal space of the storage box is divided into four groups of storage compartments by the expansion and contraction components to form independent refrigeration compartments, so as to refrigerate and preserve foods in different storage environments, and the triangular ends of each group of storage compartments are passed through the guide. The air box introduces cold air to control the temperature of the storage room, and when the quantity of food in a certain storage environment is large, the capacity of the storage room with a small quantity of refrigerated food can be reduced by the expansion and contraction components, so as to make full use of the storage The refrigerated space inside the box not only improves the utilization rate of the storage box, but also makes the temperature control of each group of storage rooms more precise.

2. In the present invention, a drainage control device is also installed on the longitudinal diffuser assembly, and further cooperates with the cross air guide box to fully diffuse the air inside the storage room, so that the cold air evenly rushes to the food, especially when the storage room is full. The diffusion component makes the bottom, middle and upper layers of the food better refrigerated and fresh, and by changing the power of the drainage fan, the moisture on the food to be dried and refrigerated is gradually absorbed by the flow of the wind to achieve the dehumidification effect. Each type of food is refrigerated and kept fresh, so that the internal air humidity can reach the optimal air humidity required by the food.

Description of drawings

Fig. 1 is the storage box structure schematic diagram of the present invention;

2 is an enlarged schematic view of the structure of the expansion and contraction assembly of the present invention;

FIG. 3 is an enlarged schematic view of the partial structure of the cross air guide box of the present invention;

4 is an enlarged schematic view of the partial structure of the drainage regulation device of the present invention;

5 is an enlarged schematic view of the internal structure of the drainage regulation device of the present invention;

Fig. 6 is the enlarged schematic diagram of the structure at A place of the present invention;

In the figure: 1. Storage box; 2. Condenser; 3. Control panel; 4. Vertical lifting device; 5. Insulation board; 6. Cross air guide box; Diffusion assembly; 10. Flexible sealing strip; 11. Air duct 1; 12. Air diffuser; 13. Lateral moving device; 71. Concave jacket seat; 72. Telescopic rod 1; 73. I-shaped seat; ;75, fixed plate; 91, drainage fan one; 92, diffuser plate; 93, telescopic rod two; 94, dispersing plate frame; 95, drainage plate frame; 81, square block; 82, drainage plate shell; 83, U-shaped Seat; 84, telescopic rod three; 85, air guide tube two; 86, control assembly; 87, drainage plate frame; 861, drainage fan two; 862, guide tube; 863, fixed ring tube; 864, rotating ring tube; 865, drive shaft; 866, elastic belt; 867, swing plate; 868, drive gear set.

Detailed ways

1-6, the present invention provides a technical solution: a food refrigeration and fresh-keeping storage box with controllable cooling capacity and air volume, which includes a storage box 1, a condenser 2, a thermal insulation board 5, an expansion and contraction assembly 7 and a cross guide The air box 6, the left and right sides of the storage box 1 and the upper and lower side shells are respectively equipped with a longitudinal lifting device 4 and a lateral moving device 13, and the inner side of the storage box 1 is provided with a parallel insulation board 5. The cross air guide box 6 For the connection of multiple groups of the expansion and contraction assemblies 7, the expansion and contraction assemblies 7 are provided with four groups and have a cross-shaped structure, and the interior of the storage box 1 is divided into four groups of storage rooms, and each group of the storage rooms is opened There is an independent exhaust channel;

The insulation board 5 is provided with a strip-shaped sliding cavity, a semi-cross air guide box is embedded in the strip-shaped sliding cavity, and a flexible sealing strip 10 is installed on the plate wall outside the remaining gap. The outer ends of the expansion and contraction components 7 of the air box are connected;

The upper shell of the storage box 1 is provided with a condenser 2, and the output end of the condenser 2 is connected with the cross air guide box 6 and the air guide pipe-11 arranged in the center of the semi-cross air guide box through pipes. The channel is communicated with the input end of the condenser, and a control panel 3 is installed on the left side of the condenser 2;

As the best embodiment, the device can directly control the capacity of the storage chamber, especially in the case of continuous replenishment and removal of food inside the storage chamber, which can conveniently store the food in cold and fresh, and improve the flexibility of storing food in the storage box. sex.

In this embodiment, the expansion/contraction assembly 7 includes a concave jacket seat 71, a telescopic rod 72, an I-shaped seat 73, a fixing plate sleeve 74 and a fixing plate 75. The concave jacket seat 71 has a left-right symmetrical structure. A horizontal telescopic rod 1 72 is fixed on the groove wall, and the output ends of the telescopic rod 1 72 on the left and right sides are respectively fixed on the left and right side plates of the I-shaped seat 73, and the upper and lower end faces of the I-shaped seat 73 are fixed with horizontal fixed The plate sleeve 74, the left and right ends of the fixed plate sleeve 74 are provided with symmetrical sliding chambers, and the interior of the sliding chamber is slidably connected with a fixed plate 75, and the left and right ends of the left and right side of the fixed plate are fixed on the on the concave jacket seat 71;

In addition, a drainage regulating device 8 is installed at the center panel of the fixed plate sleeve in the longitudinal expansion and contraction assembly, and the cold air is drained through the drainage regulating device to uniformly diffuse the middle, upper and bottom layers of the storage room.

In this embodiment, diffuser assemblies 9 are installed at the four corners of the cross air guide box 6, and all of them form an included angle of 45° with the horizontal plane. The arc side of the air guide pipe-11 provided inside the cross air guide box 6 The wall is provided with a corresponding air diffuser 12;

The diffuser assembly 9 includes a drainage fan 1 91 , a diffusion plate 92 , a telescopic rod 93 , a dispersing plate frame 94 and a drainage plate frame 95 . One-way clockwise rotation, and set in front of the drainage fan one 91;

Two independently adjustable telescopic rods 93 are installed on the left and right sides of the drainage fan one 91;

The diffuser plate 92 is a telescopic structure, and three groups are arranged, which are connected to each other to form a three-sided air diffusing direction, and each group of the diffuser plate 92 is installed with a drainage plate frame 95, which is linearly arranged along the surface of the diffuser plate. Rotate counterclockwise, the two sets of hinged connecting ends of the diffuser plates on the left are hingedly connected with the output ends of the second telescopic rod 93 on the left side, and the two sets of hinged connecting ends of the diffuser plates on the right are hingedly connected with the two output ends of the two right telescopic rods;

As a preferred embodiment, through the reciprocating expansion and contraction of the telescopic rod 2, the cold air is evenly diffused into the surface and the inner space of the food, and the refrigeration efficiency and effect are improved.

In this embodiment, the drainage regulating device 8 includes a square block 81 , a drainage plate shell 82 , a U-shaped seat 83 , a third telescopic rod 84 , a second air duct 85 and a regulating component 86 , and the square block 81 is fixed on the left and right sides. On the plate sleeve, the guide plate shell 82 is hingedly connected to the right side wall of the square block 81, and the upper and lower ends of the telescopic rod 3 84 are hingedly connected with the upper end of the guide plate shell 82 and the U-shaped seat 83 fixed on the upper end surface of the square block 81 respectively. , and set up and down symmetrically;

In addition, the upper and lower parallel drainage plate frames 87 are installed on the right side plate of the drainage plate shell 82, the second air guide pipe 85 is installed in the center of the square block 81, and the second air guide pipe 85 is provided with multiple groups of air guide ports;

The guide plate housing 82 is provided with horizontal regulating and controlling components 86, and is arranged in multiple groups in parallel longitudinally. Adjusting the guide plate shell spreads the air in the room evenly, and exhausts vertically through it, so that the internal air can circulate better.

In this embodiment, the regulating assembly 86 includes a second drainage fan 861, a fixed annular tube 863, a rotating annular tube 864, a driving shaft 865, an elastic band 866 and a swing plate 867, and the second drainage fan 861 is installed on the drainage tube At the right port of 862, the left and right side walls of the fixed annular pipe 863 are provided with air guide ports of 90°, and the left end of the guide pipe 862 is sealedly connected to the right air guide port of the fixed annular pipe 863;

A rotating annular tube 864 is coaxially connected inside the fixed annular tube 863, the axis of the rotating annular tube 864 is fixedly connected with the driving shaft 865, and the left and right side walls of the US Oh book rotating annular tube 864 are also provided with a size of 90°. the air port;

The upper and lower ends of the air guide port on the left side of the fixed ring-shaped tube 863 are connected with elastic bands 866. The left end of the elastic band 866 is connected with the right end of the swing plate 867. The center of the swing plate 867 is fixed on the shaft center of the large gear. The gears are meshed with each other, and there are also two groups of pinions that are meshed with each other between the adjacent regulating components, the pinions and the large gears are meshed with each other, and the pinion located at the uppermost end is the main drive gear;

As a preferred embodiment, when the quantity of food is large, the swing frequency and swing amplitude of the swing plate can be increased, thereby accelerating the flow of air and the cooling of the storage room.

In this embodiment, the upper and lower telescopic rods 84 drive the guide plate shell 82 to incline leftward and rightward by 15°.

In this embodiment, the hinge structure at the right end of the elastic band 866 is an elastic winding structure.

In this embodiment, the length of the fixing plate sleeve 74 is twice the length of the fixing plate 75 .

In the specific implementation, according to the type, quantity and volume of the food, the vertical lifting device and the lateral moving device are regulated by the control screen to adjust the capacity of the storage room inside the storage box, and when the storage of the food is continued to be increased in the future, it will be again The vertical lifting device and the lateral moving device are used to adjust the capacity of the storage room inside the storage box through the control screen, and the capacity of the storage room that stores less food is directly reduced. The box and the drainage control device transport cold air, and the second telescopic rod in the diffuser assembly and the drainage fan 1 are coordinated and adjusted to blow the cold air into the storage room evenly or directionally. Driven by the longitudinal gear set in the drainage control device, the pendulum plate is driven. The swing diffusion is performed with a certain frequency swing amplitude, and the cooling capacity of the blown cold air is regulated by driving the rotating shaft to drive the rotating annular tube.

The above description is only a preferred specific embodiment of the invention, but the protection scope of the present invention is not limited to this. Equivalent replacements or changes to the inventive concept shall all fall within the protection scope of the present invention.

Claims (7)

1. The utility model provides a food cold-stored fresh-keeping storage box of steerable cold volume and amount of wind, its includes storage box (1), condenser (2), heated board (5), expands and contracts subassembly (7) and cross air guide case (6), its characterized in that: the left side, the right side, the upper side and the lower side of the storage box (1) are respectively provided with a longitudinal lifting device (4) and a transverse moving device (13), the inner sides of the longitudinal lifting devices and the transverse moving devices are respectively provided with a heat insulation plate (5) parallel to the longitudinal lifting devices, the cross air guide box (6) is used for connecting a plurality of groups of expansion and contraction assemblies (7), the expansion and contraction assemblies (7) are provided with four groups and are in a cross structure, the interior of the storage box (1) is divided into four groups of storage chambers, and each group of storage chambers is provided with an independent exhaust passage;

a strip-shaped sliding cavity is formed in the heat insulation plate (5), a semi-cross air guide box is embedded in the strip-shaped sliding cavity, a flexible sealing strip (10) is installed on the plate wall outside a gap where the strip-shaped sliding cavity is embedded, and the outer side ends of the expansion and contraction components (7) of the semi-cross air guide box are connected;

a condenser (2) is arranged in a shell at the upper end of the storage box (1), the output end of the condenser (2) is communicated with a cross air guide box (6) and a first air guide pipe (11) arranged at the center of a semi-cross air guide box through a pipeline, the exhaust channel is communicated with the input end of the condenser, and a regulation and control screen (3) is arranged on the left side of the condenser (2);

the expansion and contraction assembly (7) comprises a concave jacket seat (71), a first telescopic rod (72), a I-shaped seat (73), a fixed plate sleeve (74) and a fixed plate (75), the concave jacket seat (71) is in a bilateral symmetry structure, the groove walls of the concave jacket seat are respectively fixed with the first transverse telescopic rod (72), the output ends of the first telescopic rods (72) on the left side and the right side are respectively fixed on the left side plate and the right side plate of the I-shaped seat (73), the upper end surface and the lower end surface of the I-shaped seat (73) are respectively fixed with the transverse fixed plate sleeve (74), the left end and the right end inside the fixed plate sleeve (74) are provided with symmetrical sliding chambers, the inside of each sliding chamber is slidably connected with the fixed plate (75), and the left end and the right end of the fixed plate on the left side and the right side are both fixed on the concave jacket seat (71);

and a drainage regulation and control device (8) is arranged at the central panel of the fixed plate sleeve in the longitudinal expansion and contraction assembly.

2. The food cold storage and fresh-keeping storage box capable of controlling the cold quantity and the air quantity as claimed in claim 1, characterized in that: diffusion components (9) are mounted at the four corners of the cross air guide box (6) and form an included angle of 45 degrees with the horizontal plane, and air diffusing openings (12) corresponding to arc-shaped side walls of air guide pipes (11) arranged in the cross air guide box (6) are formed in the arc-shaped side walls;

the diffusion assembly (9) comprises a first drainage fan (91), a diffusion plate (92), a second telescopic rod (93), a dispersing plate frame (94) and a drainage plate frame (95), wherein the first drainage fan (91) and the air dispersing port (12) are arranged correspondingly, and the dispersing plate frame (94) rotates clockwise in one direction and is arranged in front of the first drainage fan (91);

the left side and the right side of the drainage fan I (91) are respectively provided with a telescopic rod II (93) which can be independently adjusted;

diffuser plate (92) are extending structure to set up three groups, link up each other and form the gas direction that looses of trilateral orientation, and every group install drainage grillage (95) on diffuser plate (92), follow diffuser plate face linear arrangement, equal one-way anticlockwise rotation, its two sets of diffuser plate hinged connection in left side end and left side telescopic link two (93) output are articulated to be connected, and its two sets of diffuser plate hinged connection in right side end and two output hinged connections in right side telescopic link.

3. The food cold storage and fresh-keeping storage box capable of controlling the cold quantity and the air quantity as claimed in claim 1, characterized in that: the drainage regulation and control device (8) comprises a square block (81), a drainage plate shell (82), a U-shaped seat (83), a third telescopic rod (84), a second air guide pipe (85) and a regulation and control assembly (86), the square block (81) is fixed on the left and right side fixing plate sleeves, the drainage plate shell (82) is hinged to the right side wall of the square block (81), the upper end and the lower end of the third telescopic rod (84) are respectively hinged to the upper end of the drainage plate shell (82) and the U-shaped seat (83) fixed to the upper end face of the square block (81) and are arranged symmetrically up and down;

a drainage plate frame (87) which is parallel up and down is arranged on the right side plate of the drainage plate shell (82), a second air guide pipe (85) is arranged in the center of the square block (81), and a plurality of groups of air guide ports are arranged on the second air guide pipe (85);

and a plurality of groups of transverse regulating and controlling components (86) are arranged in the drainage plate shell (82) in a longitudinal parallel manner, and a flow guide pipe (862) in each group of regulating and controlling components (86) is communicated with the air guide port through a pipeline.

4. The food cold storage and fresh-keeping storage box capable of controlling the cold quantity and the air quantity as claimed in claim 3, characterized in that: the adjusting and controlling assembly (86) comprises a second drainage fan (861), a fixed ring type pipe (863), a rotary ring type pipe (864), a driving rotating shaft (865), an elastic belt (866) and a swinging plate (867), wherein the second drainage fan (861) is installed at the right end of a guide pipe (862), air guide ports with the size of 90 degrees are formed in the left side wall and the right side wall of the fixed ring type pipe (863), and the left end of the guide pipe (862) is in sealing connection with the air guide ports on the right side of the fixed ring type pipe (863);

a rotary annular tube (864) is coaxially and rotatably connected inside the fixed annular tube (863), the axis of the rotary annular tube (864) is fixedly connected with the driving rotating shaft (865), and air guide ports with the size of 90 degrees are also formed in the left and right side walls of the US Ook rotary annular tube (864);

the upper end and the lower end of an air guide opening in the left side of the fixed ring-shaped pipe (863) are both connected with an elastic belt (866), the left end of the elastic belt (866) is connected with the right end of a swing plate (867), the center of the swing plate (867) is fixed on the center of a gear shaft of a large gear, the upper gear and the lower gear are meshed with each other and connected with each other, two groups of mutually meshed and connected small gears are arranged between the regulating and controlling assemblies, the small gears are meshed with the large gears and connected with each other, and the small gears located at the uppermost end of the large gears are main driving gears.

5. The food cold storage and fresh-keeping storage box capable of controlling the cold quantity and the air quantity as claimed in claim 3, characterized in that: the telescopic rods (84) at the upper part and the lower part drive the drainage plate shell (82) to incline 15 degrees leftwards and rightwards.

6. The food cold storage and fresh-keeping storage box capable of controlling the cold quantity and the air quantity as claimed in claim 4, characterized in that: the right end hinge structure of the elastic belt (866) is an elastic winding structure.

7. The food cold storage and fresh-keeping storage box capable of controlling the cold quantity and the air quantity as claimed in claim 1, characterized in that: the length of the fixed plate sleeve (74) is twice that of the fixed plate (75).

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