KR100960717B1 - Apparatus to control the air pressure of freezer - Google Patents

Abstract

The present invention relates to an air pressure adjusting device for a freezer, and more particularly, the air pressure adjusting device includes a rotating means inside the inner and outer grills, while maintaining the internal and external air pressures while the internal and external air of the freezer is naturally circulated. It relates to a freezer pressure adjusting device that can reduce the cost of the product by the overall assembly process and easy maintenance.

The air pressure adjusting device for a freezer of the present invention is provided with a grill formed of an inner grill installed inside the freezer and an outer grill installed outside, spaced apart at regular intervals, and a flange of a case formed of an inner case and an outer case on an inner surface of the grill. Is in close contact with the edge of the grill to seal the inside of the grill, the flange of the fixing member between the edge of the inner grill and the flange of the inner case while the extension is bent stepwise in the back, fastening formed on both sides of the extension The first rotating plate is rotatably coupled to the side, and the rotating unit is provided on the front surface of the first rotating plate so that the second rotating plate can be rotated integrally with or separately from the first rotating plate to naturally circulate a large amount of internal and external air. There is a feature to keep the internal and external air pressure stable.

 Freezer, grill, case, fixing member, rotating means, the first rotating plate, the second rotating plate

Description

Apparatus to control the air pressure of freezer

The present invention relates to an air pressure adjusting device for a freezer, and more particularly, the air pressure adjusting device includes a rotating means inside the inner and outer grills, while maintaining the internal and external air pressures while the internal and external air of the freezer is naturally circulated. It relates to a freezer pressure adjusting device that can reduce the cost of the product by the overall assembly process and easy maintenance.

A general freezer is a device for storing food or other items at a low temperature by providing a cryogenic temperature, and is provided with a freezer compartment for storing food to prevent deterioration of the food or items by storing them at a temperature of about −70 ° C. or less. A door is formed at one side of the freezer compartment, and an air pressure adjusting device is installed at one side of the door to allow the door to be easily opened and closed.

Since the inside of the freezer is kept in a cryogenic state, the air inside is contracted, and the air pressure inside the freezer is lower than atmospheric pressure, so that a negative pressure is applied. When the user opens the door of the freezer in such a negative pressure state, the door does not open well, and the user has a risk of injury in the process of opening the door by applying excessive force.

If the air pressure inside the freezer drops compared to the air pressure outside the freezer, the freezer door is attracted to the inside of the freezer, making opening and closing difficult, and when the air pressure inside the freezer rises excessively, the freezer body may expand and change due to air pressure, thereby preventing the door from opening. Recently, various freezer pressure adjusting devices have been developed in order to solve problems such as, but there is still a problem in that the freezer inside and outside pressure balance is not evenly achieved.

In the case of pre-registered Patent Registration No. 10-0515739 for the freezer pressure adjusting device has a disadvantage that the overall assembly process is complicated and expensive to maintain.

In the conventional air pressure adjusting device, four supports 23 are formed in the cross direction in the case 2, and holes 24 are formed in the inner surface of the support 23 to form the first vent valve plate 30. And the second vent valve plate 30 'intersect each other, and the inside and outside air is circulated by the opening of the door in a state where the respective holes 24 are sealed, so that the internal air pressure and the external air pressure are naturally adjusted. .

However, in the freezer air pressure adjusting device configured as described above, when the outside air flows into the outer tube 6 through the outer grill 8, the first vent valve plate 30 moves forward and the first vent valve plate ( Outside air can be introduced while the two holes 24 blocked by 30 are opened, and if the air inside is introduced into the inner tube 4 through the inner grill 1, the second vent valve plate 30 The two holes 24 which are blocked while moving backwards may be opened to allow internal air to flow out. As described above, the conventional air pressure adjusting valve 3 may be formed by the elastic force of the spring 32. There is a problem in that the internal air pressure and the external air pressure of the freezer cannot be adjusted in a balanced manner because the elastic force of the spring 32 is unstable in a manner in which air is circulated while the vent valve plates 30 and 30 ′ move at regular intervals.

In addition, since the moving distance of the first and second vent valve plates 30 and 30 'is extremely limited, when the air pressure regulating valve 3 is used for a long time, the first and second vent valve plates 30 and 30' are used. Due to the small moving distance of the refrigerator, the internal and external air pressure of the freezer is irregular and there are many difficulties in risk of accident and opening of the door.

On the other hand, the air sucked in and out of the pressure adjusting valve 3 collides with the first and second vent valve plates 30 and 30 ', and some air is refracted and offset, and the remaining air is first and second vent valve plates. By operating (30) (30 ') to operate only 2/1 of the total area, there is a disadvantage that the circulation of the air is not made naturally and thus it is impossible to maintain a balance between the internal and external air pressures.

Conventional freezer air pressure adjusting device has a complex assembly process and operation state is complicated to increase the cost of the product, there is a lot of difficulty in maintenance due to the failure of the pressure adjusting valve.

The present invention is to solve the above problems, the object of the present invention is provided with a rotating means consisting of a first rotating plate and a second rotating plate coupled to the inside of the fixing member by a hinge shaft to rotate the outside air outside the grill When sucked through, the second rotating plate rotates about the hinge axis to allow air to flow into the inner grill. On the contrary, when the inside air flows through the inner grill, the first and second rotating plates can be integrally rotated so that the inside and outside rotate. It is to provide a freezer air pressure adjusting device that can maintain the internal and external pressure of the freezer while the air is naturally circulated.

Another object of the present invention is to form an air circulation space in the interior of the first and second rotating plate to prevent the outside air sucked into the vent hole of the first rotating plate to be refracted by the second grill plate smoothly It is to provide a freezer air pressure adjusting device for rotating operation.

Still another object of the present invention is to provide a pressure control device for a freezer, in which first and second vent holes are formed on the bottom and one side of the inner grill and the outer grill to circulate a large amount of air.

Still another object of the present invention is to vary the weight of the center of gravity weight installed in the center of the first rotating plate in accordance with the change in the amount of air flow in the process of outflowing the internal air to the outside when using the freezer air pressure adjusting device for a long time It is to provide a freezer air pressure adjusting device so that the circulation of air is made smoothly.

Another object of the present invention is to manufacture a relatively economically easy through the process guarantee design (simultaneous engineering) to make the manufacturer competitive, and at the same time easy assembly and installation work, replacement and maintenance of parts It is to provide a simple freezer pressure regulator.

Still another object of the present invention is that the engaging piece formed at the front center of the first rotating plate can be attached and detached with the magnet fixed to the bottom of the fixed frame so that when the air stronger than the magnetic force of the magnet is introduced, the first rotating plate and the second rotating plate are integrated. It is to provide a pressure control device for a freezer for rotating the air to naturally circulate the first rotating plate while maintaining a tight contact with the fixed frame.

In order to achieve the object of the present invention as described above, the inner and outer grille is installed on one side wall surface of the freezer according to the present invention, the outer peripheral surface of the inner and outer case is coupled between the inner and outer grilles the inner and outer A freezer air pressure adjusting device for supporting a grill, and forming an air pressure adjusting valve in the inner and outer cases to adjust internal air pressure and external air pressure as the internal and external air is circulated, and the internal grill inside the freezer. Is provided, the outer grill is provided on the opposite side of the inner grill spaced apart by a predetermined interval, the first vent hole is formed on the bottom surface of the inner and outer grill, the second wall on one side of the first vent hole A reel formed with a plurality of ventilation holes; A flange of the inner case is in close contact with the rear edges of the inner and outer grilles, and an extension is formed at the rear of the flange to extend backward to have an inclined surface, and the flange of the outer case is formed on the rear edge of the outer grill. A case in close contact with an extension part formed at a rear surface of the flange to enclose the extension part of the inner case and to seal the inside thereof; A flange of the fixed frame is inserted and fixed between the edge of the inner grill and the flange of the inner case, and an extension part which is stepwise bent on the lower part of the flange is formed to extend rearward, and fastening pieces are formed on both sides of the extension part to hinge shafts. A fixing member to which it is coupled; A first rotating piece is installed on an upper rear side of the first rotating plate so as to be fixed to the fastening piece of the fixing frame by a hinge shaft, and a second rotating piece is formed on the front upper part of the first rotating plate, and is supported on the inner center of the first rotating plate. Four vent holes are formed on the outer circumferential surface to form a frame, and a shaft hole is formed in the center of the support frame, a center of gravity is coupled to the shaft hole, and a second shaft is hinged to the second rotating piece of the first rotating plate. It is coupled to the rotating means for opening and closing the inside of the vent hole while rotating integrally with the first rotating plate or rotates only the second rotating plate separately.

The air circulation space is formed inside the first and second rotating plates of the rotating means of the present invention to prevent the external air flowing into the first rotating plate to be refracted and offset, thereby allowing the air to circulate naturally.

As described above, the air pressure adjusting device for a freezer according to the present invention includes a rotating means for rotating the second rotating plate when the outside air is sucked into the outer grill, and rotating the first and second rotating plates integrally when the air is introduced into the inner grill. The internal and external air is circulated naturally so that the internal and external air pressures are automatically adjusted in a balanced manner.

The present invention has the effect of easily and quickly varying the weight of the center of gravity weight installed in the first rotating plate in accordance with the change in the internal air or air pressure of the freezer, so that the rotating means can be operated smoothly.

The present invention forms an air circulation space inside the first and second rotary plates to prevent the collision between the first rotary plate and the air when the external air flows into the vent hole of the first rotary plate, thereby refracting and offsetting the large amount. Air is introduced to the air circulation space formed inside the first and second rotating plate is an invention that has the effect of allowing the rotation means to operate smoothly.

The present invention has the effect of reducing the cost of the product is easy to assembly and installation work, easy replacement work and maintenance work of parts.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 to 6, in the freezer air pressure adjusting device of the present invention, a grill 10 including an inner grill 11 installed inside the freezer and an outer grill 12 installed outside is provided, respectively. A case 20 including an inner case 21 and an outer case 22 is installed inside the grill 10 to seal the inside of the grill 10 and the inner grill 11 and the outer case 21. Between the fixing member 30 is installed, the first rotating plate 41 is rotatably coupled to one side of the fixing member 30, the second rotating plate 46 on the front surface of the first rotating plate (41). ) Is largely composed of a rotating means 40 that is rotatably coupled.

The grill 10 is installed inside and outside the freezer,

An inner grill 11 is installed inside the freezer, and an outer grill 12 is installed outside the opposite side. The edges of the inner and outer grills 11 and 12 are formed in a rectangular shape and bolts are formed at corners. A hole is formed, and the rim surface is bent backward so that the flanges 21a and 22a of the case 20 to be described later are in close contact with the rear of the rim surface and are fixed with bolts.

A first vent hole (11a) (12a) is formed on the bottom of the inner and outer grill (11) 12, the first vent hole (11a) (12a) from the top to the bottom so that air flows smoothly It is formed to have an inclined surface, and a plurality of second vent holes (11b, 12b) is formed in a horizontal direction in one wall of the first vent holes (11a, 12a) to allow more air to flow in. .

One side wall surface of the first vent holes 11a and 12a of the inner and outer grills 11 and 12 is bent forward, and a horizontal block is formed on the inner wall surfaces of the second vent holes 11b and 12b. Groups 11c and 12c protrude to couple the filtration filter 13 to be described later.

The filtration filter 13 is formed in a plate shape and bent in a shape of "", but the bottom surface 13a of the filtration filter 13 is formed to have an inclined surface downward, so that the first vent holes 11a and 12a are formed. The bottom surface 13a of the filtration filter 13 coincides with the inclined surface of the bottom surface 13b and is integrally bent with the bottom surface 13a to be in close contact with the inner surface of the second vent holes 11b and 12b. ) And the side wall 13b are fixed to the engaging protrusions 11c and 12c.

Meanwhile, the filtration filter 13 may be installed and used in any one of the first vent holes 11a and 12a of the inner and outer grills 11 and 12, but preferably the first of the outer grill 12. It is installed in the ventilation hole 12a.

The case 20 installed inside the inner and outer grills 11 and 12,

The flange 21a of the inner case 21 is in close contact with the rear edges of the inner and outer grills 11 and 12, and an extension portion 21b is formed at the lower portion of the flange 21a having a rectangular shape. The extension part 21b is formed to extend backward to have an inclined surface, the flange 22a of the outer case 22 is in close contact with the rear rim of the outer grill 12 to be fixed by a bolt, and the flange 22a The extension part 22b formed in the lower part of the bottom part encloses the extension part 21b of the inner case 21 to seal the inside of the inner and outer grills 11 and 12.

The fixing member 30 installed in the inner case 21 is,

An flange 31a of the fixing frame 31 is inserted between the edge surface of the inner grill 11 and the flange 21a of the inner case 21 to be fixed with a bolt, and an extension formed below the flange 31a. One end of the portion 31b is extended to the rear and is in close contact with the bottom surface of the extension portion 21b of the inner case 21, the extension portion 31b of the fixing frame 31 is bent stepwise to be fastened to both sides of the rear top A piece 32 is formed, and the fastening piece 32 protrudes rearward, and the hinge shaft 33 is coupled to a hole formed therein.

The fixing member 30 is extended to an intermediate position of the inner and outer cases 21 and 22 so that the inside thereof is hollow so that the rotating means 40 to be described later can be coupled to the inner surface of the extension part 31b. 31b) is extended and bent downward at the end.

Rotating means 40 is installed inside the fixing member 30 to circulate the internal and external air,

The rotating means 40 is composed of a first rotary plate 41 and the second rotary plate 46, the first rotary plate 41 is a hinge shaft 33 to the fastening piece 32 of the fixed frame 31. The first rotating piece 41a protrudes from the upper rear side of the first rotating plate 41 so as to be fixed, and the second rotating piece 41b protrudes from the upper surface of the opposite side of the first rotating plate 41, and the first rotating plate 41a protrudes. The support frame 42 is formed in the crosswise direction in the center of the rotating plate 41, and through the outer circumferential surface of the support frame 42 to form four vent holes 43 to allow the outside air to circulate The shaft hole 44 is formed in the center of the support frame 42 so that the center of gravity weight 45 is in close contact with the rear surface of the shaft hole 44 and is coupled to each other by a bolt.

A locking piece 41c is formed at the center of the bottom surface of the first rotating plate 41 so that the locking piece 41c is in close contact with the extension part 31b of the fixing member 30 to maintain the vertical state. 41) does not move towards the inner grill (11).

Rotating piece 46a is formed on an upper portion of the front surface of the second rotating plate 41b formed at the front of the first rotating plate 41 so that the second rotating plate 46 may be coupled to the hinge shaft. The seating portion 46b is formed to be in close contact with both side surfaces of the first rotating plate 41 so that the first rotating plate 41 and the second rotating plate 46 are integrally formed by the hinge shaft. Can be rotated.

An air circulation space 47 is formed on the inner surfaces of the first and second rotary plates 41 and 46, and the outer circumferential surface of the air circulation space 47 is the first and second rotary plates 41 ( The front and rear edges of the 46 are in close contact with each other and the outside air flowing into the vent hole 43 is collected into the air circulation space 47 so that the operation of the second rotating plate 46 is performed smoothly. It can introduce a large amount of outside air.

On the other hand, when the outside of the first rotary plate 41 and the second rotary plate 46 when the second rotary plate 46 is opened solely around the hinge axis, the internal air of the inner grill 11 is introduced The first and second rotating plates 41 and 46 rotate integrally.

7 and 8 are a perspective view and a cross-sectional view showing another embodiment of the first rotating plate, the configuration of the grill 10, the case 20 and the fixing member 30 is omitted because the same as described above However, the difference from the fixing member 30 is that the magnet member 31c is installed at the center of the bottom surface of the extension part 31b of the fixing member 30, and the configuration of the rotating means 40 is the same as described above. When only the difference is seen, the engaging piece 41c protrudes downward from the center of the bottom surface of the first rotating plate 41, and the receiving groove 41d is formed inside the engaging piece 41c, and the receiving groove. Inside the 41d, a plate-shaped magnet member 31c is inserted and fixed so that the front surface of the locking piece 41c is attached to the magnet member 31c by a magnetic force so that the first rotating plate 41 is fixed to the frame ( 31) can be securely fixed.

Pressure control apparatus for a freezer according to the present invention configured as described above is operated as follows.

When the temperature inside the freezer decreases, the internal pressure also decreases, causing a difference from the outside pressure of the freezer. On the contrary, when the temperature inside the freezer rises due to defrosting, the air pressure inside the freezer rises. Due to the difficulty in opening and closing the freezer door.

When the user pulls the handle of the freezer door, the outside air is sucked into the first and second vent holes 12a and 12b of the outer grill 12 to pass through the hole 14 of the filtration filter 13 and the first rotating plate. Passing through the four vent holes 43 formed in the 41 to the air circulation space 47 to push the second rotary plate 46, the second rotary plate 46 in Figure 5 with respect to the hinge axis As shown, the outer air is introduced into the inner grill 11 to maintain a balance between the internal and external air pressures.

On the other hand, the air circulation space 47 formed inside the first and second rotary plates 41 and 46 has an air collision with the first rotary plate 41 when external air flows into the first rotary plate 41. It prevents refraction and offsetting in advance so that a large amount of air can be naturally circulated.

On the contrary, when the door of the freezer is closed, the internal air flows into the first and second vent holes 11a and 12a of the inner grill 11 and is in close contact with the second rotating plate 46 while pushing the second rotating plate 46. While the first rotating plate 41 rotates about the first rotating piece 41a, the internal air passes through the filtration filter 13 and the first and second vent holes 12a and 12b through the outer grill 12. It penetrates and flows out.

Here, the first rotating plate 41 may be quickly returned to its original position by the weight of the center of gravity weight 45 installed at the center of the first rotating plate 41.

The heating wire is installed on the outer circumferential surface of the fixing member 30 in the process of circulating the air inside and outside as described above, and the heating wire is fixed to one side of the fixing member 30 with a bolt to fix the freezer. At the same time, power is applied so that the first and second rotating plates 41 and 46 of the rotating means 40 are always installed in a situation where the freezing or frost can not work. The configuration is omitted.

Freezer air pressure adjusting device of the present invention has a feature that allows the user to easily open and close the freezer door by stably maintaining the internal and external air pressure of the freezer while naturally circulating the air while sucking and outflowing a large amount of internal and external air. Invention.

Meanwhile, the first rotating plate 41 and the fixing frame 31 of FIGS. 7 and 8 may be attached and detached by a magnetic force so that the first and second vent holes 11a of the inner grill 11 are closed when the door of the freezer is closed. While the inner air is introduced into the 12a, the second rotating plate 46 is pushed and the engaging piece 41c of the first rotating plate 41 closely contacted with the second rotating plate 46 is connected to the magnet member 31c. As the first rotating plate 41 rotates about the first rotating piece 41a while being detached, the internal air passes through the outer grill 12 to the filtration filter 13 and the first and second vent holes 12a and 12b. It penetrates through and flows out.

The locking piece 41c and the magnet member 31c of the first rotating plate 41 are detachable only when internal air, which is stronger than the magnetic force of the magnetic member 41c, is introduced, so that the first rotating plate 41 is fixed to the frame. While maintaining the state in close contact with (31) tightly to maintain the internal airtight while the first rotating plate 41, which is opened by the internal air can quickly return to the original state to maintain a fixed state have.

The barometric pressure adjusting device for a freezer according to the present invention described above is not limited to the above-described embodiments, and those skilled in the art without departing from the gist of the present invention as claimed in the following claims. Ramen has the technical spirit to the extent that anyone can make various changes.

1 is a perspective view of the pressure adjusting device for a freezer of the present invention.

Figure 2 is an exploded perspective view of the pressure adjusting device for a freezer of the present invention.

3 is a cross-sectional view of the present invention.

Figure 4 is a rear perspective view of the rotating means of the present invention.

Figure 5 is a cross-sectional view showing the operating state of the first rotating plate of the present invention.

Figure 6 is a cross-sectional view showing the operating state of the second rotating plate of the present invention.

7 is a perspective view of another embodiment of the first rotating plate of the present invention.

8 is a cross-sectional view of the coupling state of the first rotating plate of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: grill 11: inner grill

12: outer grill 11a, 12a: first vent hole

11b, 12b: 2nd vent hole 11c, 12c: engaging protrusion

13: filtration filter 14: hole

20: case 21: inner case

22: outer case 21a, 22a: flange

21b, 22b: extension part 30: fixing member

31: fixed frame 31a: flange

31b: extension part 31c: magnet member

32: Fastener 33: Hinge Shaft

40: rotation means 41: first rotating plate

41a, 41b: 1st and 2nd rotation piece 41c: Jamming piece

41d: storage groove 42: support frame

43: vent hole 44: shaft ball

45: center of gravity 46: second rotating plate

46a: rotary piece 46b: seating portion

47: air circulation space 48: locking plate

Claims (8)

Inner and outer grills are installed on one side wall of the freezer, and outer circumferential surfaces of the inner and outer cases are coupled between the inner and outer grills to support the inner and outer grills, and an air pressure adjusting valve is formed inside the inner and outer cases. In the freezer air pressure adjusting device is formed so that the internal and external air pressure is circulated while the internal and external air of the freezer is circulated, An inner grill 11 is provided inside the freezer, and outer grills 12 are provided on opposite sides of the inner grills 11 at regular intervals, and bottom surfaces of the inner and outer grills 11 and 12 are provided. A grill 10 having first vent holes 11a and 12a formed therein and a plurality of second vent holes 11b and 12b formed on one side wall of the first vent holes 11a and 12a; The flange 21a of the inner case 21 is in close contact with the rear edges of the inner and outer grills 11 and 12, and an extension portion 21b is formed at the rear of the flange 21a so that the inclined surface is rearward. It is formed to have an extension, the flange 22a of the outer case 22 is in close contact with the rear edge of the outer grill 12, the extension portion 22b is formed on the rear surface of the flange 22a is the inner case A case 20 enclosing the extension portion 21b of the 21 to seal the inside thereof; The flange 31a of the fixing frame 31 is inserted and fixed between the edge surface of the inner grill 11 and the flange 21a of the inner case 21, and is extended stepwise bent to the lower portion of the flange 31a. A fixing member 30 having a portion 31b extending rearward and fastening pieces 32 formed on both sides of the extension portion 31b to which the hinge shaft 33 is coupled; And The first rotating plate 41a is installed on an upper portion of the rear surface of the first rotating plate 41 so as to be fixed to the fastening piece 32 of the fixing frame 31 by the hinge shaft 33. A second rotating piece 41b is formed at the upper front side, and a support frame 42 is formed at the inner center of the first rotating plate 41 so that four ventilation holes 43 are formed at the outer circumferential surface thereof. A shaft hole 44 is formed in the center of the 42, and the center of gravity weight 45 is coupled to the shaft hole 44, and the engaging piece 41c protrudes downward from the center of the bottom surface of the first rotating plate 41. The second rotating plate 46 is coupled to the second rotating plate 41b of the first rotating plate 41 by a hinge shaft to rotate integrally with the first rotating plate 41 or only the second rotating plate 46. Rotating means (40) for opening and closing the inside of the vent hole 43 while rotating separately; Pressure control device for freezer, characterized in that consisting of. 2. The locking projection (11c) (12c) according to claim 1, wherein one side of the first through holes (11a) (12a) and the second through holes (11b) and (12b) of the inner and outer grills (11) and (12). ) Is formed, and the filtration filter 13 is installed at any one of the engaging projections 11c and 12c, wherein the filtration filter 13 is formed in a plate shape and bent in a shape of "" ", but the filtration filter The bottom surface 13a of 13 is formed to have an inclined surface downward, and the side wall 13b bent integrally with the bottom surface 13a is in close contact with the inner surface of the second vent holes 11b and 12b. And a plurality of holes (14) formed at predetermined intervals in the bottom surface (13a) and the side wall (13b). The air pressure adjusting device for a freezer according to claim 1, wherein an air circulation space (47) is formed in the first rotating plate (41) and the second rotating plate (46). According to claim 1 or claim 3, wherein the rotating piece 46a is formed on the upper surface of the second rotating plate 46, the second rotating piece of the first rotating plate 41 on both sides of the rotating piece 46a A freezer pressure adjusting device, characterized in that the seating portion (46b) is formed so that the (41b) is in close contact. According to claim 1, The weight center weight 45 is the weight center weight 45 is screwed to the end of the bolt is inserted into the shaft hole 44, the weight of the weight center weight 45 The air pressure adjusting device for a freezer, characterized in that the air flowing from the inner grill (11) can be opened and closed naturally to the first rotating plate (41). Inner and outer grills are installed on one side wall of the freezer, and outer circumferential surfaces of the inner and outer cases are coupled between the inner and outer grills to support the inner and outer grills, and the pressure is adjusted inside the inner and outer cases. In the freezer air pressure adjusting device is formed by forming a side to circulate the internal and external air of the freezer to adjust the internal pressure and the external air pressure, An inner grill 11 is provided inside the freezer, and outer grills 12 are provided on opposite sides of the inner grills 11 at regular intervals, and bottom surfaces of the inner and outer grills 11 and 12 are provided. First through holes 11a and 12a are formed in the plurality of holes, and a plurality of second through holes 11b and 12b are formed on one side wall surface of the first through holes 11a and 12a. Engaging projections 11c and 12c are formed on one side of the pores 11a and 12a and the second ventilation holes 11b and 12b, and the filtration filter is located at any one of the engaging projections 11c and 12c. A grill 10 provided with 13; The flange 21a of the inner case 21 is in close contact with the rear edges of the inner and outer grills 11 and 12, and an extension portion 21b is formed at the rear of the flange 21a so that the inclined surface is rearward. It is formed to have an extension, the flange 22a of the outer case 22 is in close contact with the rear edge of the outer grill 12, the extension portion 22b is formed on the rear surface of the flange 22a is the inner case A case 20 enclosing the extension portion 21b of the 21 to seal the inside thereof; The flange 31a of the fixing frame 31 is inserted and fixed between the edge surface of the inner grill 11 and the flange 21a of the inner case 21, and is extended stepwise bent to the lower portion of the flange 31a. The portion 31b is formed to extend rearward, the fastening pieces 32 are formed on both sides of the extension portion 31b so that the hinge shaft 33 is coupled, and at the lower center of the extension portion 31b, a magnet member ( A fixing member 30 to which 31c is installed; And The first rotating plate 41a is installed on an upper portion of the rear surface of the first rotating plate 41 so as to be fixed to the fastening piece 32 of the fixing frame 31 by the hinge shaft 33. A second rotating piece 41b is formed at the upper front side, and a support frame 42 is formed at the inner center of the first rotating plate 41 so that four ventilation holes 43 are formed at the outer circumferential surface thereof. A shaft hole 44 is formed in the center of the 42, and the center of gravity weight 45 is coupled to the shaft hole 44, and the engaging piece 41c protrudes downward from the center of the bottom surface of the first rotating plate 41. The accommodating groove 41d is formed inside the engaging piece 41c, and the engaging plate 48 is inserted into the accommodating groove 41d to be attached to the magnet member 31c, and the first rotating plate The rotating piece 46a formed on the front surface of the second rotating plate 46 is coupled to the second rotating plate 41b of the second rotating plate 41b by a hinge shaft to rotate integrally with the first rotating plate 41 or to have a second rotating plate ( 46 times a year And rotating means (40) for opening and closing the air circulation space portion 47 formed in the ventilation holes (43); Pressure control device for freezer, characterized in that consisting of. The magnet member 31c and the locking plate 48 are fixed to the bottom surface of the extension part 31b of the fixed frame 31 by bolts, and the magnet member 31c is fixed to the magnet member 31c. The back side of the engaging piece (41c) on the opposite side is in close contact with the magnet plate 48, characterized in that the engaging plate 48 inserted into the interior of the engaging piece (41c) is attached and detached with the magnetic member (48). According to claim 6, The weight center weight 45 is the weight center weight 45 is screwed to the end of the bolt inserted into the shaft hole 44, the weight of the weight center weight 45 The air pressure adjusting device for a freezer, characterized in that the air flowing from the inner grill (11) can be opened and closed naturally to the first rotating plate (41).

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