JPS588134Y2 - Open type freezer, refrigerated display device - Google Patents

Description

[Detailed description of the invention] This invention relates to an open-type freezer/refrigerator display device in which the air volume of the air curtain hardly changes even if the frequency of the connected power source changes from 50Hz to 60Hz. be.

The cooling performance of open-type frozen and refrigerated display devices is greatly dependent on the ability of the air curtain to isolate the opening from the outside air and cool the inside of the display room at the same time.

However, this air curtain has 1. Wind speed, 20 distribution, 3
．． Thickness, 4. Direction (orientation), 5. Performance is affected by the degree of rectification, etc., but when making open-type freezer and refrigerated display devices, all other factors other than wind speed are determined at the stage of designing the display device.

However, regarding the wind speed, the blower motor (induction motor)
However, since the rotation speed varies depending on the power supply frequency, it was not possible to make it constant.

In general, blowers that use an induction motor as the drive motor are
When operating at a power supply frequency of 60°, the rotational speed is 50°.
It is 60150 (1.2 times) compared to the case of scolding, and as shown by the pressure curves P'so and P'so in Fig. 1, P'60 is better at 60 stops than P'60 is at 50 stops. F”
It has a characteristic that the amount of air blown is larger than that of SO.

Open-type freezer/refrigerator display units require a large amount of air flow, and in order to prevent noise, these blowers are used in parallel operation, but as shown in Figure 2, the operating points of the blowers are: This is the intersection of the resistance (load) curve R and the pressure curves P'so and P'6o at 50 Hz and 60 Hz, respectively.

That is, in the case of 50 Hz, the air flow rate is A at the intersection of the pressure curve P'5o and the resistance curve R, and in the case of 60Hz, the air flow rate is B at the intersection of the pressure curve P'6o and the resistance curve R. However, the amount of air blowing was higher when using 60H2, and it was not possible to operate at the optimum air flow rate for both 50 and 60 clothes.

Therefore, the present invention solves the drawbacks of the conventional example by providing a hole in the partition plate in the air passage that opens and closes depending on the power frequency.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 6.

1 is a part of an open-type frozen or refrigerated display device shown in cross-sectional view, in which an outer wall 2 is created by filling and foaming a heat insulating material 5 between an outer panel 3 and an inner panel 4, and an air passage is provided inside the outer wall 2. 6, an inner wall 8 forming a display chamber 7 is provided.

The air passage 6 is provided with an evaporator 9 and a partition plate 10 equipped with a blower 11 for forcibly circulating air.

As shown in FIGS. 5 and 6, the partition plate 10 has a hole 12 for attaching a blower 11 and passing circulating air, and a lid 1.
A hole 13 is provided which can be closed by providing a hole 4 or opened by removing it.

In the above embodiment, the hole 13 is opened and closed using the cover 14 which can be attached and removed.
It goes without saying that the means for opening and closing is not limited to this.

When operating at a power supply frequency of 50 m, the hole 13 of the partition plate 10 is closed and the operation is performed to move the conventional pressure curve p'so upward to the pressure curve P5o.

Also, when operating at a power frequency of 60Hz, hole 13
The pressure curve P'60 is changed to
Move downward to pressure curve Pso.

Therefore, the side pressure curves Pso and P6o are the same curve, and the intersection point (operating point) with the resistance curve R is at an overlapping position, so that almost the same amount of air C is circulated as an air curtain. be able to.

As described above, the present invention has a simple structure in which a hole 13 is made in the partition plate 10 for installing the blower 11 that separates the high voltage side and the low voltage side, and this hole 13 is opened and closed depending on the power source connected. This makes it possible to form a good air curtain regardless of the power supply frequency, and is extremely useful in practice.

[Brief explanation of drawings]

Figure 1 shows the relationship between the air volume and pressure of a blower using an induction motor, and Figure 2 shows the relationship between the air resistance, blower pressure, and air volume when the fans in Figure 1 are operated in parallel. Figures 3 to 6 relate to an embodiment of the open-type refrigeration and refrigerated display device of the present invention. Parts plan,
Figure 5 is a partial perspective view of the partition plate part, Figure 6 is D of Figure 5.
It is a partial plan view taken along the D line. 6... Air passage, 10... Partition plate, 1
1...Blower, 12...Hole for installing the blower, 13...Hole that opens and closes depending on the power frequency.

Claims (1)

[Scope of utility model registration request] An open-type refrigerator characterized in that a partition plate 10 provided in an air passage 6 to separate a high-pressure side and a low-pressure side is provided with a hole 12 in which a blower 11 is attached and a hole 13 that opens and closes depending on the power frequency. Refrigerated display.