JPH087341Y2 - Compact structure of refrigerator evaporator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an evaporator used in a refrigerator, and more specifically to a compact structure of the evaporator.

(Prior Art) As shown in FIG. 5, an evaporator 100 of this type includes a main body 102.
And a pair of end plates 103, 104 that are parallel to each other and extend vertically, a meandering pipe 105, and a large number of fins 106 that are inserted into the pipe 105 at right angles at a predetermined pitch. ing. The lower end of the space sandwiched between the end plates 103 and 104 serves as an air inlet 101. The pipe 105 has a meandering shape in which straight portions and bent portions are alternately continuous, and the straight portions are both end plates.
The bent portions are located parallel to each other between 103 and 104 and orthogonal to the end plates 103 and 104, and the bent portions are located outside the end plates 103 and 104.

In order to prevent frost from forming on the fins 106 and hinder the air flow, of the pitches P1 and P2 between the adjacent fins 106 and 106, particularly the fins 106 near the air inlet 101.
The pitch P2 of is set to be larger than the pitch P1 of the fins 106 in other portions.

(Problems to be solved by the invention) However, if the pitch P2 of the fins 106 near the air inlet 101 is set to be large as in the structure of FIG. Becomes larger and the device becomes larger.

Therefore, in order to eliminate such a problem, the entrance 10
Place the glass tube heater 110 at position 1 and
It is also possible to defrost by heating the fins 106 intermittently at 0 and to make the evaporator 100 compact.

However, the structure in which the heater 110 is used for heating reduces the cooling capacity of the evaporator 100 during defrosting, which is not preferable. In addition, since it is necessary to provide a heat amount corresponding to the latent heat of fusion of frost for defrosting, there are disadvantages such as large heat loss and interruption of operation of the cooler during defrosting. Further, in the case of a glass tube heater for defrosting, it also causes a large resistance in terms of the amount of ventilation, which causes a decrease in efficiency.

A number of structures are known in which an oscillator for electromagnetic waves, ultrasonic waves, or the like is provided to exert a defrosting action (for example, JP-A-49-65552). However, those structures merely exert a defrosting action and do not attempt to make the evaporator 100 compact as in the present invention.

The present invention aims to solve the above problems.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a pair of end plates that are parallel to each other and extend vertically, and fixed to both end plates, and a straight portion and a bent portion. Equipped with alternately continuous meandering pipes and a large number of fins that are provided at a predetermined pitch at right angles to the straight portions of the pipes, the lower end of the space sandwiched by both end plates is the air inlet, and the upper end is the air outlet. The pipe is positioned so that the straight parts are parallel to each other between the end plates and orthogonal to the end plates, and the bent parts are located outside the end plates. In the refrigerator evaporator in which the pitch is set larger than the fins of the part,
The oscillator is arranged outside the end plate and at a position facing the space where the fins near the air inlet are located and closer to the end plate than the apex of the bent portion of the pipe.

(Operation) Electromagnetic waves or ultrasonic waves are emitted from the oscillator. When the electromagnetic wave hits the frosted portion of the evaporator, the temperature of only the frost layer portion rises to melt and defrost. Further, in the case of ultrasonic waves, the pipes and fins vibrate to shake off the frost that is about to adhere and defrost it.

(Embodiment) In FIGS. 1 to 3 showing an embodiment of the present invention,
Reference numeral 10 denotes an evaporator, which is composed of a main body 14 and has a pair of end plates 15 and 16 facing each other in parallel and extending vertically, and a meandering pipe 18.
And a large number of fins 19. The space between the both end plates 15 and 16 has an air inlet 11 at the lower end and an air outlet 12 at the upper end. Each of the end plates 15 and 16 is made of, for example, a light metal such as aluminum or an aluminum alloy, and is provided with fitting holes 17 which are vertically arranged at equal intervals. A pipe 18, which serves as a medium passage, is fitted into the fitting hole 17. The pipe 18 has a meandering shape in which straight portions and bent portions are alternately and continuously formed, and the straight portions are formed on both end plates 1
The bent portions are located parallel to each other between 5 and 16 and orthogonal to the end plates 15 and 16, and the bent portions are located outside the end plates 15 and 16. Each straight section of pipe 18 has a number of fins
19 are inserted at a right angle to the pipe 18 at a predetermined pitch.

Here, in particular, the pitch P2 of the fins 19 near the air inlet 11
Is set to, for example, 10 to 15 mm, and is set to be larger than the pitch P1 (for example, 5 to 7.5 mm) of the fins 19 in other portions. Moreover, the pitch P2 is set smaller than the pitch P2 (for example, 20 to 30 mm) in the conventional structure so that the distance between the both end plates 15 and 16 of the present invention, that is, the effective area width W is sufficiently compact. Has been done.

Further, the present invention adopts the following structure so as to exert a sufficient defrosting action even in such a structure.

The fixing plate 2 is provided at a position outside the end plates 15 and 16 and facing the space S where the fins 19 having the pitch P2 are located.
0 and 21 are fixed to the pipe 18. And the fixed plate 2
A known oscillator 22 is fixed to the outside of 0 and 21. Therefore, the oscillator 22 faces the space S.

The oscillator 22 is controlled as described in detail in, for example, Japanese Patent Laid-Open No. 61-143669, and intermittently or continuously operates on the basis of a signal from a detector (not shown) to emit electromagnetic waves and frost. Melt by raising the temperature of only the layer. Alternatively, the oscillator 22 is activated as described in JP-A-64-63764 to emit an ultrasonic wave, and transmits the vibration caused by the ultrasonic wave to the fin 19 via the end plates 15, 16 and the pipe 18. By doing so, the frost that was about to adhere is dropped.

According to the above structure, the air introduced from the air inlet 11 is cooled by the refrigerant in the pipe 18 and discharged from the air outlet 12. In this process, the pipe 18 and the fin 19
Although frost forms on the surface of the
Electromagnetic waves or ultrasonic waves are intermittently or continuously emitted from the 22 toward the frost layer, so the frost layer is constantly melted by the electromagnetic waves, or the frost that has adhered is dropped by the vibration of the ultrasonic waves, and the frost is finned. It does not block the space between 19 and 19. Therefore, as shown in FIG. 1, the effective area width W of the main body 14 of the evaporator 10 can be reduced to make the entire product compact.

In the embodiment shown in FIG. 4, the fixing plates 20 and 21 described in FIGS. 1 to 3 are omitted and the oscillator 22 is directly fixed to the end plates 15 and 16. Even in this structure,
Similar to the structure described in FIGS. 1 to 3, the oscillator 22
The entire product can be made compact by the defrosting action by.

In the embodiment described in FIGS. 1 to 4, the structure in which the oscillators 22 are provided on both sides of each of the end plates 15 and 16 has been described, but the structure in which the oscillator 22 is provided only in one end plate is adopted. It goes without saying that it is okay.

(Effect of the Invention) As described above, according to the present invention, the pipe 18 is bent at a position outside the end plates 15 and 16 and facing the space S where the fin 19 near the air inlet 11 is located. Since the oscillator 22 is arranged at a position closer to the end plates 15 and 16 than the apex of the section, the frost layer generated on the surfaces of the pipe 18 and the fins 19 during the operation of the apparatus is removed by melting or dropping by the oscillator 22. You can Therefore, the pitch P2 of the fins 19 in the vicinity of the air inlet 11 can be set to be sufficiently small, and as a result, the effective area width W of the evaporator can be reduced and the entire product can be made compact.

Moreover, in the present invention, since the oscillator 22 is arranged outside the end plates 15 and 16, there is no fear of narrowing the effective area width W of the evaporator, and therefore, the oscillator 22 may adversely affect the circulation of air. There is no.

Further, in the present invention, since the oscillator 22 is arranged at a position closer to the end plates 15 and 16 than the apex of the bent portion of the pipe 18,
The oscillator 22 does not extend beyond the bent portion of the pipe 18, which also contributes to the compactness of the evaporator.

Further, in the present invention, since the oscillators 22 are arranged only at the positions facing the space S, the number of the oscillators 22 can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an essential part of the present invention, FIG. 2 is a left side view of FIG. 1, FIG. 3 is a right side view of FIG. 1, and FIG. 4 is a view showing another embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of a part, and FIG. 5 is a schematic cross-sectional view of a main part showing a conventional structure. 10 ... Evaporator, 11 ... Air inlet, 12 ... Air outlet, 14 ... Main body,
15, 16 ... end plate, 18 ... pipe, 19 ... fin, 22 ... oscillator,
P1, P2 ... Pitch, W ... Effective area width

Claims (1)

[Scope of utility model registration request] 1. A pair of end plates extending parallel to each other and extending vertically, and a meandering pipe fixed to both end plates and having straight portions and bent portions alternately continuous, and a right angle to the straight portion of the pipe. A plurality of fins provided at a predetermined pitch, the lower end of the space sandwiched between the end plates is an air inlet and the upper end is an air outlet. Evaporation for refrigerators in which the bent parts are located parallel to each other and orthogonal to the end plate, the bent part is located outside the end plate, and the fins near the air inlet have a larger pitch than the fins in other parts. In the container, the oscillator is placed outside the end plate and facing the space where the fins near the air inlet are located, and closer to the end plate than the apex of the bent portion of the pipe. Compact structure of refrigerator evaporator.