JPH04113184A - Defrosting device for show case - Google Patents

Abstract

PURPOSE:To improve safety of a defrosting device and provide a high degree of control over a freshness of stored foods by a method wherein a plurality of sensors disposed near an evaporator for cooling the product and for use in sensing a surrounding temperature of the product are disposed near the evaporator. CONSTITUTION:A plurality of sensors 19 for use in sensing a surrounding temperature of an evaporator 17 are disposed in a rightward or a leftward longitudinal direction of an evaporator 17, supported at partition walls 3. A defrosting device is comprised of a thermostat having sensors 19, a heater 18 and a time switch. As all of a plurality of sensors 19 detect that the surrounding temperature of the evaporator 17 is increased through heating with the heater 18 and the surrounding temperature around the evaporator 17 near the sensors 19 reaches its predetermined temperature, an electrical energization for the heater 18 is stopped with the thermostat and then the defrosting operation is completed. Due to this fact, it is substantially eliminated that the lowest temperature of the surrounding outer circumference of the evaporator 17 having a high temperature difference at each of the outer circumferential portions in a longitudinal direction, in particular, is decreased below the predetermined temperature.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention includes an evaporator for cooling the products in a case for displaying the products, and prevents frost from forming on the outer periphery of the evaporator during the cooling process. This invention relates to a defrosting device for a showcase that is heated with a heater or the like and periodically melted and removed.

[Conventional technology]

Showcases display products for sale inside the cases.
Depending on the type of product displayed within the case, an evaporator, which is a component of a cooling device for cooling the product, is provided within the case in order to maintain the freshness of the product. In addition, if moisture contained in the air inside the case forms frost on the outer circumference of the evaporator during the cooling process, this frost will reduce the cooling efficiency of the evaporator. Power UPI regularly at the peaks etc. arranged! , a defrosting device is provided to remove the defrost. This defrosting device heats and melts the frost attached to the outer circumference of the evaporator at a set fixed time, and the evaporator is detected by a sensor placed near the evaporator that detects the ambient temperature. It is generally configured to stop when the ambient temperature reaches a predetermined temperature. On the other hand, a showcase is a self-service device that assumes that customers directly view and select the products displayed inside the case, and then take them out and purchase them through the opening on the outer surface of the case. The opening side of a menjoguchi is generally rectangular, and some showcases have a side length of more than 3 meters.

An evaporator whose length in the longitudinal direction is aligned with and parallel to one of the sides of the opening of the case is usually installed inside the case, and the temperature at each part of the outer periphery of the evaporator varies depending on the temperature. There is a temperature difference, and there is also a large temperature difference in each part of the evaporator, especially in the direction of the hand.Therefore, the sensing body detects when the temperature of the lowest temperature part around the evaporator reaches a predetermined temperature and activates the defrosting device. There is no problem if the detector stops, but when this detector detects the temperature of a part other than the lowest temperature and the defrost device stops, the temperature of the part other than the part detected by the detector is lower than this part. Adhering frost may not be melted away. In such cases, the unmelted frost gradually grows and forms ice block-like frost around the evaporator, which significantly reduces the cooling efficiency of the evaporator and prevents products from being displayed in the case. 2 and 3 show a defrosting device for this type of showcase. FIG. 2 shows the internal structure of the front open type showcase to which the present invention is applied.
In the longitudinal section, the right side of the figure is the front side, and Figure 3 is a perspective view of the main parts seen from the front diagonally upper left, showing the configuration of a conventional showcase defrosting device, and in both cases, the right side of the figure is the front side. It is on the front side.

In FIGS. 2 and 3, 1 is a case, and this case 1 is made up of a case book #2 with a C-shaped side cross section, which is open on both left and right sides and the front, and is formed of heat insulating walls, and a case body 2. r supported at intervals along the inner peripheral surface of
9! JW! A stone wall 3 with a C-shaped r surface, an @ wall 4 with a C-shaped side cross section supported along the inner circumferential surface of the partition wall 3 at intervals, a case book #2, and a partition wall 3.4. It is composed of a measuring plate 5 that covers both the left and right sides, and an open opening 6 that opens on the front side is formed. (1! l plate 5. The space partitioned by the case body 2 and the partition wall 3 forms a ventilation passage 7, and the space partitioned by the side plate 5, partition wall 3, and partition wall 4 forms a ventilation passage 8. ventilation duct 7
．． Openings are formed at both upper and lower ends of each of the openings 8 along the upper and lower edges of the opening 6, opening into the case 1 on the lower surface and the upper surface, respectively, and facing each other. The upper one of these openings forms an air outlet 9.10, respectively;
The lower openings form suction ports 11.12, respectively, and the blow-off ports 9.10 are covered with honeycomb-shaped flow regulators 13.14 that are open at both upper and lower ends. In addition, ventilation duct 7
Air blowers 15 and 16 for blowing the air inside the case 1 are installed at the inner upper part and the inner lower part of the ventilation passage 8, respectively. - of the components of the refrigerator whose length in the direction is equal to the length in the longitudinal direction and the longitudinal direction is along this left and right direction.
An evaporator 17 is provided. This evaporator 17
An electric heater 18 is provided on the front side of the evaporator 17, facing the evaporator 17, and is energized by a time switch (not shown) to heat the frost that adheres to the outer periphery of the evaporator 17 during the cooling process. Also, the ventilation passage 8 directly above the left end of the evaporator 17
Inside, a sensor t#19 for detecting the ambient temperature of the evaporator 17, which is a hot water part on which a thermostat (not shown) is mounted, is supported by the partition wall 3, and a thermostuff 1-2 heater 18 (not shown) having a sensing body 19 is mounted. #Frostdarkness is configured by a time switch (not shown) and a time switch (not shown). In addition, in case 1,
A plurality of boxes 20 are vertically arranged and supported by cantilevers of vt@ on the partition wall 4, and on which products are placed and displayed.
A drain port 21 is formed at the bottom of the case body 2 to discharge drain such as defrosting water to the outside of the case 1.

In such a configuration, the operation of the defrosting device during defrosting, in which the frost adhering to the outer periphery of the evaporator 17 is heated and melted away during the process of cooling the product in the case 1, is performed at a predetermined time. The heater 18, which is energized by the time switch, starts defrosting, and the defrosting water generated by this defrosting drips from the evaporator 17 onto the bottom of the case body 2 and flows out of the case 1 from the drain port 21. Drained. The ambient temperature of the evaporator 17 increases due to heating by the heater 18, and the detection #19 detects that the ambient temperature of the evaporator 17 near detection #-19 has reached a predetermined temperature, and a thermostat (not shown) turns on electricity to the heater 18. Defrosting ends when the is stopped. In addition,
The product on f1M20 in case 1 is cooled by evaporator 17.
Ventilate while being cooled down! A part of this air flow passes through a rectifying fluid 14, is rectified, becomes a laminar flow, and is blown out from an outlet 10 to form an air curtain covering the frontage 6. This air curtain and the air curtain formed when the air flow blown through the ventilation passage 7 by the blower 15 passes through the rectifier #13, becomes a laminar flow, and is blown out from the air outlet 9. The inside and outside of the case 1 are thermally isolated by being heavily covered.

[Problem to be solved by the invention]

By the way, such a defrosting device for a showcase is supported on the partition wall 3 during defrosting, in which frost adhering to the outer periphery of the evaporator 17 is melted and removed by heating with force IJ in the process of cooling the products in the case 1. Since there is only one sensing element 19 that detects the ambient temperature of the evaporator 17, which is installed in the ventilation passage 8 directly above the left end of the evaporator 17, there is a large temperature difference at each part of the outer periphery in the horizontal direction, which is long in the left and right direction. It is not always possible to detect the temperature of the lowest temperature part on the outer periphery of the evaporator 17. Therefore, the sensing body 19 detects when the temperature of the lowest temperature part on the outer periphery of the evaporator 17 has reached a predetermined temperature. There is no problem if the defrosting device stops, but if the detecting body 19 detects the temperature of a part other than the lowest part and the defrosting device stops, the detecting body 1
Frost adhering to areas other than the area detected by 9 whose temperature is lower than this area may not be melted and removed. In such a case, the remaining frost gradually grows and forms a lump of ice-like frost around the outer periphery of the evaporator 17, and the cooling efficiency of the evaporator 5F and 317 decreases significantly. There is a problem that the freshness of the product decreases.

This invention provides a defrosting device for a showcase that does not significantly reduce the cooling efficiency of the evaporator or reduce the freshness of products displayed in the case due to lumps of ice-like frost forming on the outer periphery of the evaporator. The challenge is to provide the following.

[Means to solve the problem]

In order to solve the above problems, according to the present invention, an evaporator for cooling the products is provided in a case in which products are displayed, and frost that adheres to the outer periphery of the evaporator during the cooling process is removed from the vicinity of the evaporator. In a showcase defrosting device that periodically melts and removes the evaporator by heating it with a heater or the like until the ambient temperature of the evaporator, which is detected by a detecting body disposed in a sensor and detecting the ambient temperature, reaches a predetermined temperature, the detecting body A plurality of evaporators are arranged near the evaporator.

Further, a plurality of sensing bodies are arranged near the evaporator along the longitudinal direction of the evaporator.

[Effect]

In this invention, a plurality of sensing bodies are disposed near the evaporator that is provided in a case for displaying products and that cools the product, and that detects the ambient temperature. During defrosting, which heats and melts the frost that adheres to the evaporator's periphery during the process of cooling products, it is possible to detect the temperature of the lowest temperature part of the evaporator's periphery, where there are temperature differences at various parts of the evaporator's periphery. becomes.

In addition, a plurality of sensing bodies are disposed near the evaporator that cools the product, which is provided in a case for displaying products inside, and detects the ambient temperature of the product, along the longitudinal direction of the evaporator. During defrosting, which heats and melts the frost that adheres to the evaporator's periphery during the process of cooling the products inside the case, the temperature at the evaporator's periphery, where there is a large temperature difference at various parts of the evaporator's outer circumference in the longitudinal direction, is the highest. It becomes possible to detect the temperature of low temperature areas.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a vertical cross-sectional perspective view of the main part seen from above the front diagonal thread, showing the configuration of a defrosting device for a showcase according to an embodiment of the present invention, and FIG. The left side shows the internal structure of the shaped showcase.In both longitudinal cross-sectional views, the right side of the figure is the front side, and parts that are common or the same as those in the third section are designated by the same reference numerals.

In FIGS. 1 and 2, 1 is a case, and this case 1 is connected to the case body 2. Partition wall 3. Partition wall 4 and side plate 5
and an open opening 6 that opens in the front.
is formed. 5 side plates A space partitioned by the main body 2 and the partition wall 3, and the side plates 5. The spaces partitioned by the partition wall 3 and the partition wall 4 each form a ventilation passage 7.8,
At the upper and lower ends of each of these ventilation passages 7 and 8, openings are formed that open on the lower surface and the upper surface of the case 1, respectively, along the upper and lower edges of the opening 6, and face each other. The upper opening among these openings is the air outlet 9.10,
The lower openings each form a suction port 1112,
The air outlets 9.10 are each covered with a regulating fluid 13.14. In addition, a blower 1516 is provided in the upper part of the ventilation passage 7 and the lower part of the ventilation passage 8, and this blower]6
In the ventilation passage 8 on the depth side of the case 1, there is a cooling device, which is one of the components of the refrigerator, whose length in the horizontal direction matches the length in the horizontal direction of the opening 6 of the case 1, and whose longitudinal direction is along this horizontal direction. A certain evaporator 17 is provided. On the front side of the evaporator 17, facing the evaporator 17, there is an electric heater 18 that is energized by a time switch (not shown) and heats the frost that adheres to the outer circumference of the evaporator 17 during the cooling process. It is set up. In addition, in the ventilation passage 8 directly above the left end of the evaporator 17, a sensor 19 for detecting the ambient temperature of the evaporator 17, which is the third temperature part of a thermostat (not shown), is installed in the left-right direction, which is the longitudinal direction of the evaporator 17. A defrosting device is constituted by a thermostat (not shown) having one sensing body, a heater 18 (not shown), and a time switch (not shown). Note that the other configurations are the same as the conventional example.

The aforementioned W! In the process of cooling the products on the shelves 20 in the case 1, cooling of the products is the same as in the conventional example. The operation of the showcase defrosting device of the present invention during defrosting by melting and removing is that the heater 18, which is energized by a time switch (not shown) at a preset fixed time, starts defrosting; The generated defrosting water drips onto the bottom surface of the case body 2 from the evaporator 17 and is drained out of the case 1 from the drain port 21. - On the other hand, when the ambient temperature of the evaporator 17 rises due to force U heating by the heater 18, and all of the plurality of detection bodies detect that the ambient temperature of the evaporator 17 near the detection body 19 has reached a predetermined temperature, as shown in the figure. The thermostat that is not turned on stops power supply to the heater 18, and defrosting ends.

Therefore, it is greatly reduced that the temperature of the lowest temperature part of the outer circumference of the evaporator 17, which has a large temperature difference in each part of the outer circumference in the longitudinal direction, is significantly reduced from falling below a predetermined temperature, and if this predetermined temperature is appropriate, The frost that adheres to the surface will not remain even after defrosting.

〔Effect of the invention〕

According to this invention, a plurality of sensing bodies are disposed near the evaporator that is housed in a case for displaying products and that cools the products, and that detects the ambient temperature. During defrosting, it becomes possible to detect the temperature of the lowest temperature part of the evaporator periphery, where there is a temperature difference at various parts of the periphery.

In addition, a plurality of sensing bodies for detecting the ambient temperature are disposed near an evaporator that cools the products, and are installed in a case for displaying products inside, and are arranged near the evaporator along the longitudinal direction of the evaporator. Because of this arrangement, during defrosting, the temperature around the evaporator, where there is a large temperature difference at various parts of the periphery in the longitudinal direction, can be reduced. & It also becomes possible to detect the temperature of low temperature areas.

As a result, if the predetermined temperature when defrosting is stopped is appropriate, the temperature at the lowest temperature part of the evaporator periphery will be significantly reduced from falling below the predetermined temperature, and the frost remaining after defrosting will not grow. Defrosting can be performed more reliably without forming ice block-like frost around the evaporator, which reduces the cooling efficiency of the evaporator and the freshness of displayed products. However, if even one of them operates normally, defrosting can be stopped, and the effects of improving the safety of the defrosting device and improving the freshness management of displayed products can be achieved.

[Brief explanation of the drawing]

The first section shows the configuration of a defrosting device for a showcase according to one embodiment of the present invention, and shows the main part V! seen from the front diagonally upper left. [
17r @ perspective view, FIG. 2 is a left side vertical sectional view showing the internal structure of the front open type showcase to which the present invention is applied, and FIG. 3 is a front oblique view showing the structure of a conventional showcase removing device. It is a perspective view of the main part seen from the upper left. DESCRIPTION OF SYMBOLS 1... Case, 2... Case body, 3, 4... Partition wall, 5... Side plate, 6... Opening, 7.8... Ventilation path,
9,10...Air outlet, 11.12...Suction port, 13
．． 14... rectifier, 15.16... blower, 17.
... Evaporator, 18... Heater, 19... Sensing object, 2
0... Shelf, 21... Drain port.

Claims (1)

[Claims] 1) An evaporator for cooling the products is provided in a case in which products are displayed, and the frost that adheres to the outer periphery of the evaporator during the cooling process is prevented from being disposed near the evaporator. In a showcase defrosting device that periodically melts and removes the evaporator by heating it with a heater etc. until the ambient temperature of the evaporator detected by a sensing body reaches a predetermined temperature, the sensing body is placed near the evaporator. A defrosting device for a showcase, characterized in that a plurality of defrosting devices are installed in the showcase. 2) The showcase defrosting device according to claim 1, wherein a plurality of sensing bodies are arranged near the evaporator along the longitudinal direction of the evaporator.