JP5332891B2 - vending machine - Google Patents

Description

  The present invention relates to a vending machine, and more particularly to a vending machine that cools or heats a product such as a beverage in a container such as a can, a bottle, a pack, or a plastic bottle for sale.

The vending machine includes a compressor that compresses the refrigerant, a condenser that condenses the compressed refrigerant (hereinafter referred to as “high-pressure high-temperature refrigerant”), and a condensed refrigerant (hereinafter referred to as “gas cooler”). The expansion means for expanding the refrigerant (hereinafter referred to as “high pressure / intermediate temperature refrigerant”), a plurality of evaporators for evaporating the expanded refrigerant (hereinafter referred to as “low pressure / low temperature refrigerant”), and these were sequentially connected to evaporate. Each refrigeration cycle comprising a refrigerant (hereinafter referred to as “low-pressure medium-temperature refrigerant”) and a refrigeration cycle comprising a refrigerant, and in each product storage (hereinafter referred to as “inside”) that stores products. There is an evaporator in each) to cool the goods.
And the cooling control apparatus of the vending machine which can defrost for each evaporator in order to prevent the fall of the cooling capacity by frost adhering to an evaporator (henceforth "frosting") is disclosed. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 9-128621 (page 4, FIG. 4)

In the invention disclosed in Patent Document 1, when the temperature of the evaporator is equal to or lower than a temperature at which frost adheres (hereinafter referred to as “frosting temperature”) for a predetermined time or more, the evaporator is in a frosted state. It judges, stops cooling and defrosts.
However, since the frost is a solidification of moisture (water vapor) that has entered the cabinet, even if the temperature of the evaporator falls below the frosting temperature, frost does not form when there is no moisture in the cabinet. For this reason, even when it is not actually frosting, defrosting was performed, and there existed a problem that the cooling load immediately after restarting cooling will raise product temperature or temporarily restarted.
Further, since the temperature of the evaporator cannot be set to the frosting temperature or lower for a predetermined time or more, there is a problem that rapid cooling cannot be performed, for example, immediately after a product is replenished.

The present invention solves such a problem, and a first object is to provide a vending machine that can determine whether an evaporator is in a frosted state and perform defrosting without waste. The purpose is to do.
The second purpose is not to determine whether or not the evaporator is in a frosted state every fixed time, but when it is determined that frost is likely to occur, for example, immediately after a product is replenished. An object of the present invention is to provide a vending machine capable of shortening the determination time and effectively performing defrosting.

(1) A vending machine according to the present invention (Claim 1) is disposed within a housing, which is surrounded by a heat insulating material and has an opening on one surface, a heat insulating door for opening and closing the opening, and the housing. A product storage compartment partitioned by a partition plate, and a cooling means for cooling the product storage compartment,
The cooling means compresses the refrigerant, the condenser into which the refrigerant flowing out from the compressor flows in, the expansion means into which the refrigerant flowing out from the condenser flows in, and the refrigerant flowing out from the expansion means An evaporator installed in the product storage, and a refrigerant pipe for circulating the refrigerant by sequentially connecting the compressor, the condenser, the expansion means, the evaporator and the compressor,
The temperature of the evaporator is repeatedly measured over a predetermined time while intermittently supplying the refrigerant to the evaporator, and the temperature rising probability that the measured temperature of the evaporator exceeds a predetermined frost melting temperature is obtained. Only when the temperature rising probability is equal to or lower than a predetermined defrosting probability, the supply of the refrigerant is temporarily stopped immediately after the predetermined time has elapsed.

  (2) In the vending machine according to the present invention (Claim 2), in (1), the temperature of the evaporator is set to the predetermined time while the refrigerant is intermittently supplied to the evaporator every predetermined time. The temperature rise probability that the measured temperature of the evaporator has exceeded a predetermined frost melting temperature is obtained.

(3) The vending machine according to the present invention (Claim 3) is disposed within the housing, surrounded by a heat insulating material and provided with a housing having an opening on one side, a heat insulating door for opening and closing the opening. A product storage compartment partitioned by a partition plate, and a cooling means for cooling the product storage compartment,
The cooling means compresses the refrigerant, the condenser into which the refrigerant flowing out from the compressor flows in, the expansion means into which the refrigerant flowing out from the condenser flows in, and the refrigerant flowing out from the expansion means An evaporator installed in the product storage, and a refrigerant pipe for circulating the refrigerant by sequentially connecting the compressor, the condenser, the expansion means, the evaporator and the compressor,
While the refrigerant is intermittently supplied to the evaporator, the temperature of the evaporator is repeatedly measured over a predetermined first time, and the temperature rise during the period when the measured evaporator temperature exceeds a predetermined frost melting temperature A first step of determining a probability;
Only when the current temperature increase probability is equal to or lower than the predetermined defrosting probability, the supply of the refrigerant is stopped immediately after the first time has elapsed, and then the refrigerant is intermittently supplied to the evaporator again. A second step of repeatedly measuring the temperature of the evaporator over the first time, and determining a next temperature rising probability that the measured temperature of the evaporator exceeds a predetermined frost melting temperature;
If the current temperature rise probability exceeds the predetermined defrost probability and is less than the predetermined time shortening probability, the refrigerant is intermittently supplied to the evaporator without stopping the supply of the refrigerant immediately after the first time has elapsed. The temperature of the evaporator is repeatedly measured over a second time shorter than the first time while supplying the temperature, and the next temperature rising probability that the measured evaporator temperature exceeds a predetermined frost melting temperature is obtained. The third step;
If the current temperature increase probability is equal to or greater than a predetermined time reduction probability, the refrigerant is intermittently supplied to the evaporator without stopping supply of the refrigerant immediately after the first time has elapsed. A fourth step of repeatedly measuring the temperature over the first time, and determining a next temperature rising probability that the measured evaporator temperature exceeds a predetermined frost melting temperature;
And after completing any of the second step, the third step, or the fourth step, the next stage temperature rise probability is read as the current period temperature rise probability in the first step, and the second step, One of the third step and the fourth step is executed.

  (4) In the vending machine according to the present invention (Claim 4), in any one of (1) to (3), an internal fan that sends air toward the evaporator is installed, and the predetermined time is While the supply of the refrigerant is stopped immediately after the passage, the internal fan is rotating.

(I) The vending machine according to claim 1 of the present invention repeatedly measures the temperature of the evaporator over a predetermined time (H1) while intermittently supplying the refrigerant to the evaporator, When the probability (P1, hereinafter referred to as “temperature increase probability”) that the temperature (Tj) has exceeded the frost melting temperature (Tm) is obtained, and the temperature increase probability (P1) is equal to or less than a predetermined defrost probability (Pm) Only when (P1 ≦ Pm, hereinafter referred to as “defrosting condition”), the supply of the refrigerant is temporarily stopped, that is, the defrosting operation is performed immediately after the predetermined time (H1) has elapsed.
That is, when the temperature rise probability P1 in the predetermined time H1 exceeds the defrost probability Pm (Pm <P1), it means that the frequency T of the evaporator exceeds the frost melting temperature Tm frequently. There is no frost formation, or even if there is frost formation, the amount of frost formation is small, and it is also considered that it can be melted (melted) within a predetermined time H1.
Therefore, the defrosting operation is not executed at this time. Then, since there is no useless defrosting operation (refrigerant supply stop), the temperature of the cooled product is not increased, and the appropriately cooled product can be sold.
The temperature increase probability P1 is the evaporator temperature (Tj) with respect to the number of times the refrigerant supply to the evaporator is stopped during the predetermined time (H1) (same as the number of times the refrigerant is supplied to the evaporator). ) Is the ratio of the number of times the frost melting temperature (Tm, for example, 0 ° C.) has been exceeded.
That is, at the timing when the refrigerant is accidentally supplied, the defrosting operation is executed even though the evaporator temperature Tj is low and the amount of frost formation is small, or at the timing when the refrigerant is accidentally supplied, It is possible to prevent the defrosting operation from being executed even if the evaporator temperature Tj is high and the amount of frost formation is large.

(Ii) The vending machine according to claim 2 of the present invention repeats the temperature Tj of the evaporator over the predetermined time H1 while supplying the refrigerant intermittently to the evaporator again after the predetermined time H1 has elapsed. Measure the temperature rise probability P1.
That is, since it is determined that the defrost condition (P1 ≦ Pm) is satisfied every predetermined time H1 (for example, every 8 hours), when the defrost condition is not satisfied when the first predetermined time H1 has elapsed. When the next predetermined time H1 elapses, it is determined again that the defrost condition is satisfied. Therefore, in such a case, the defrosting operation is not performed for at least twice the predetermined time H1 (for example, 16 hours).
On the other hand, when the defrosting condition is satisfied at the time when the first predetermined time H1 has elapsed, the defrosting operation is performed at that time, and the defrosting condition is satisfied again at the time when the next predetermined time H1 has elapsed. Therefore, the defrosting operation may be executed every predetermined time H1.

(Iii) The vending machine according to claim 3 of the present invention includes a first step for obtaining a current temperature increase probability P1 in the first time H1,
A second step of executing the defrosting operation only when the current temperature increase probability P1 is equal to or less than the defrost probability Pm (P1 ≦ Pm), and then again obtaining the next temperature increase probability P2 in the first time H1,
When the current temperature increase probability P1 is equal to or higher than the defrost probability Pm and less than the time shortening probability Pn (Pm ≦ P1 <Pn), the defrost operation is performed, and then the next time increase in the second time H2 (H2 <H1) A third step for determining the temperature probability P2,
When the current temperature increase probability P1 is greater than or equal to the time shortening probability Pn (Pn ≦ P1), the defrosting operation is not performed immediately after the first time H1 has elapsed, and the next temperature increase probability P2 in the next first time H1. A fourth step for determining
And after completing any of the second step, the third step, or the fourth step, the next temperature increase probability P2 is read as the current temperature increase probability P1 in the first step, and the second step, the third step, or Perform any of the fourth steps.
That is, when the defrost condition (P1 ≦ Pm) is satisfied, it is determined that the defrost condition is satisfied after the first time has passed.
On the other hand, when the defrosting condition is not satisfied, the defrosting operation is not executed. However, when the current temperature increase probability P1 is not sufficiently large, the second time shorter than the first time is next. When the time has elapsed, it is determined that the defrost condition is satisfied. Therefore, even if there is a possibility that frosting may progress while “first time + first time (for example, 8 hours + 8 hours = 16 hours)” has elapsed, “first time + second time (for example, 8 hours) Since the frosting condition is determined at the time when “time + 4 hours = 12 hours” has elapsed, the progress of frosting can be prevented.
Furthermore, if the current temperature increase probability P1 is sufficiently large and significantly exceeds the defrost probability Pm, there is no possibility that frost formation will proceed during the “first time + first time” (almost), Next, the establishment of the defrost condition is determined when the first time has passed.

(Iv) Since the vending machine according to claim 4 of the present invention rotates the internal fan while the refrigerant supply to the evaporator is stopped as the defrosting operation , the defrosting is promoted.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the front view explaining the vending machine concerning Embodiment 1 of this invention. Sectional drawing of the side view of the vending machine demonstrated in FIG. The refrigerant circuit figure which shows the cooling means mounted in the vending machine shown in FIG. The flowchart which shows the control method 1 of the defrost operation | movement in the vending machine shown in FIG. The flowchart which shows the control method 2 of the defrost operation in the vending machine shown in FIG. The time chart which shows the execution timing of the defrost operation in the control method 2 shown in FIG.

[Embodiment 1]
1 to 6 illustrate a vending machine according to Embodiment 1 of the present invention. FIG. 1 (a) is a sectional view in front view, and FIG. 1 (b) is a sectional view in side view. FIG. 2, FIG. 2 is a refrigerant circuit diagram showing the mounted cooling means, FIG. 3 is a time chart showing the transition of the temperature of the evaporator and the internal temperature with respect to the operating state of the compressor, and FIG. 4 is a control method of the defrosting operation 5 is a flowchart showing a control method 2 of the defrosting operation, and FIG. 6 is a time chart showing the execution timing of the defrosting operation in the control method 2. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and a part of the description is omitted.

(vending machine)
In FIG. 1, a vending machine 1000 includes a main body cabinet 200, a product storage box 400 surrounded by a heat insulating material 300 inside the cabinet 200, and a product replenishment unit that opens and closes the product storage case 400 when the product S is replenished. The door 404, the product storage box 400, an inner door 405 for blocking outside air, and a front door 406 of the vending machine 1000 are provided.

(Product storage)
The product storage 400 is divided by partition plates 403LM and 403MR into a product store (hereinafter referred to as “left store”) 40L, a product store (hereinafter referred to as “center store”) 40M, and a product store (hereinafter referred to as “right store”). ) 40R (these may be referred to as “commodity 40” respectively or collectively).
In addition, in the following description, in the member arrange | positioned in each of the left store | warehouse | chamber 40L, the center store | warehouse | chamber 40M, and the right store | warehouse | chamber 40R, when explaining a common content, each is put together or each is individually named In some cases, the description of “left store, middle store, right store” and subscripts “L, M, R” are omitted.

  In each merchandise store 40, a merchandise storage rack 407 for storing the merchandise S, a merchandise take-out port 409 for taking out the merchandise S that has naturally dropped from the merchandise storage rack 407, and the merchandise S are guided to the merchandise take-out opening 409. A merchandise guide plate 408 is installed, and the lower part of the product guide plate 408 is an internal component storage chamber 410. In addition, a circulation duct 420 is provided for circulating the internal air to the internal component storage chamber 410 via the commodity storage rack 407.

The internal component storage chamber 410 has an internal fan 6f that causes the internal air to pass through the product guide plate 408 (provided with a vent hole) and collide with the product S, and a downstream of the internal fan 6f ( The internal heat exchanging means 440 (which will be described in detail later) on the side far from the circulation duct 420, the air duct 450 that houses the internal fan 6 f and the internal heat exchanging means 440, and the air duct 450 communicate And a wind tunnel 460 through which air passes. And the internal temperature sensor 500 which measures the internal temperature in the upper surface of the wind tunnel 460 is installed.
Further, a machine room 480 for housing the condensing unit 470 and the external fan 2f and an electrical equipment storage room 490 for storing electrical equipment and control means are disposed below the product storage 400. Yes.

(Refrigerant circulation circuit)
In FIG. 2, the refrigerant circuit 100 included in the vending machine 1000 includes a compressor 1 that compresses refrigerant, a gas cooler 2 that is connected to the compressor 1 by a pipe 12 and into which refrigerant flowing out of the compressor 1 flows, and a gas cooler 2. A branch 3 that distributes the refrigerant that is connected by a pipe 23 and flows out of a condenser (hereinafter referred to as a “gas cooler”) 2, and a left warehouse connected by a pipe 36L, a pipe 36M, and a pipe 36R that are branched at the branch 3. An evaporator 6L, a center evaporator 6M, and a right evaporator 6R are provided.

The pipe 36L, the pipe 36M and the pipe 36R are provided with an on-off valve 4L, an on-off valve 4M and an on-off valve 4R, an expansion means (hereinafter referred to as “capillary”) 5L, a capillary 5M and a capillary 5R, respectively. Yes. Furthermore, the pipe 67L, the pipe 67M, and the pipe 67R connected to the outlet side of the left warehouse evaporator 6L, the middle warehouse evaporator 6M, and the right warehouse evaporator 6R are merged at the junction 7, and the junction 7 and the accumulator 8 are plumbed. 78. The accumulator 8 and the inlet side of the compressor 1 are connected by a pipe 81. Thus, a refrigerant circuit is formed in which the refrigerant discharged from the compressor 1 circulates through the members.
It should be noted that a temperature measuring means (hereinafter referred to as “thermistor”) 9L, a thermistor 9M and a thermistor 9R are installed in the left warehouse evaporator 6L, the middle warehouse evaporator 6M and the right warehouse evaporator 6R, respectively.
Hereinafter, the common contents may be described by omitting the subscripts “L, M, R” of the symbols meaning “left warehouse, middle warehouse, right warehouse”.

(Evaporator temperature transition)
In FIG. 3, (a) shows the case where there is no frost formation, (b) shows the case where there is a large amount of frost formation, and (c) shows the case where there is a little frost formation. The middle row shows the internal temperature, and the lower row shows the operating condition of the compressor.
In FIG. 3A, when the internal temperature measured by the internal temperature sensor 500 rises to an upper limit temperature (indicated as ON) that requires the compressor 1 to start, the compressor 1 starts. As a result, the internal temperature drops substantially linearly. When the internal temperature drops to the lower limit temperature (indicated as OFF) that requires the compressor 1 to stop, the compressor 1 stops its operation.
At this time, the temperature of the evaporator 6 gradually decreases for a while after the operation of the compressor 1 is resumed, and eventually settles to a constant temperature. Then, after the operation of the compressor 1 is stopped, the temperature of the evaporator 6 gradually increases, but the frost that has formed on the evaporator 6 is melted (melted), so that it evaporates until the frost is completely thawed. The temperature of the vessel 6 does not rise at the freezing point (0 ° C.), and rises after the frost has completely thawed.

In FIG. 3B, after the operation of the compressor 1 is stopped, the temperature of the evaporator 6 rises, but remains constant at a freezing point (0 ° C.). Then, after restarting the operation of the compressor 1, it is lowered. That is, while the operation of the compressor 1 is stopped, the frost formed on the evaporator 6 is not completely thawed (melted).
In (c) of FIG. 3, in the initial stage where the operation of the compressor 1 is repeatedly stopped and restarted, the temperature of the evaporator 6 does not rise above the freezing point (0 ° C.). However, as the repetition proceeds, the temperature rises above the freezing point (0 ° C.) at a timing near the end of the time during which the operation of the compressor 1 is stopped. That is, by repeating the above, it can be seen that the frost that has formed is completely thawed.

(Control method 1)
FIG. 4 is a flowchart for explaining the first defrosting operation control method. In FIG. 4, first, a temperature rise probability P1 at which the measured temperature Tj exceeds the frost melting temperature (for example, 0 ° C.) in the first time H1 (for example, 8 hours) is obtained (S1).
Next, Atsushi Nobori rate P1 is a predetermined defrosting probability Pm or less (P1 ≦ Pm, hereinafter referred to as "defrosting condition", for example, P1 ≦ 10%) it is determined whether (S2).
Only when the defrosting condition is satisfied, the defrosting operation is executed (S3).
Further, it is determined whether the control is continued, that is, whether an instruction signal or the like for stopping the control is input (S4).
And when continuing the said control, the temperature increase probability P1 in the following 1st time H1 is calculated | required (S5), and it returns to step 2 (S2).

That is, for example, at 8:00 when the first time H1 (e.g., 8 hours) has elapsed since the defrosting operation was performed at midnight (0:00), the removal is performed during this period (0: 00 to 8:00). It is determined whether or not the frost condition is satisfied, and when the defrost condition is satisfied, the defrost operation is executed at 8:00 (accurately, a little later). Then, at 16:00 when the first time H1 elapses, it is determined whether the defrosting condition is satisfied at the next first time H1 (8: 00 to 16:00).
On the other hand, when the defrosting condition is not satisfied at 8:00, the defrosting operation is not performed, and further, the next first time H1 (8:00) at 16:00 when the first time H1 has passed. To 16:00) is determined.
The defrosting operation is to stop the supply of the refrigerant to the evaporator 6 that satisfies the defrosting condition for a certain time (for example, 15 minutes). At this time, if the internal fan 6f is started in parallel with the stop of the refrigerant supply, the warm heat held by the internal air is transferred to the evaporator 6, so that defrosting (frost melting) is promoted.

  Therefore, as in the conventional technique, when the temperature of the evaporator in a predetermined specific time zone is lower than the predetermined temperature, if the defrosting operation is performed immediately, the frost melts after the specific time zone. In the end, by performing wasteful defrosting operation, the temperature of the cooled product may be increased, but in the present invention, the degree of frost formation is estimated with probability. The execution of useless defrosting operation is eliminated. Therefore, since the temperature of the cooled product does not increase and it is not necessary to rapidly cool again, the operation of the compressor 1 is leveled and an energy saving effect is obtained.

(Control method 2)
FIG. 5 and FIG. 6 explain the control method 2 of the defrosting operation, FIG. 5 is a flowchart, and FIG. 6 is a time chart.
In FIG. 5, the current temperature increase probability P1 in the first time H1 (for example, 8 hours) is obtained (S10). Next, it is determined whether the current temperature increase probability P1 is equal to or less than the defrost probability Pm (P1 ≦ Pm, hereinafter referred to as “defrost condition”) (S21).
Only when the defrosting condition is satisfied, the defrosting operation is executed (S22). Thereafter, the next temperature increase probability P2 in the first time H1 is obtained again (S23). On the other hand, it is determined whether or not the current temperature increase probability P1 exceeds the defrost probability Pm and is less than the time shortening probability Pn (Pm <P1 <Pn, hereinafter referred to as “time shortening condition”) (S31).
When the time shortening condition is satisfied, the defrosting operation is not executed (S32) . Thereafter, the next temperature increase probability P2 in the second time H2 (H2 <H1) is obtained (S33).
Further, when the current temperature increase probability P1 is equal to or greater than the time shortening probability Pn (Pn ≦ P1), the defrosting operation is not performed immediately after the first time H1 has passed (S42), and further in the next first time H1. Next-term temperature rise probability P2 is obtained (S43).
Therefore, it is determined whether the control is continued, that is, whether an instruction signal or the like for stopping the control is input (S50).
When the control is continued, the next temperature increase probability P2 is read as the current temperature increase probability P1 (S60), and the process returns to step 21 (S21).

That is, for example, at 8:00 when the first time H1 (for example, 8 hours) has elapsed since the defrosting operation was performed at midnight (0:00), the current period during this period (0: 00 to 8:00) It is determined whether or not the defrosting condition is established for the temperature rise probability P1, and when the defrosting condition is satisfied, the defrosting operation is executed at 8:00 (accurately a little later). Next, at 16:00 when the first time H1 elapses, the next temperature increase probability P2 in the next first time H1 (8: 00 to 16:00) is obtained.
On the other hand, if the defrost condition is not satisfied at 8:00, it is determined whether the time reduction condition is satisfied. When the time shortening condition is satisfied, the defrosting operation is not performed, and further, the second time H2 (8: 00 to 00: 00) at 12:00 when the second time H2 (for example, 4 hours) has elapsed. 12:00), the next stage temperature rise probability P2 is obtained.
Further, when both the defrosting condition and the time shortening condition are not satisfied at 8:00, the defrosting operation is not executed, and the first time H1 ( 8: 00 to 16:00), the next stage temperature increase probability P2 is obtained.
Therefore, the next temperature increase probability P2 is read as the current temperature increase probability P1, and the control after 8:00 is repeated.

Therefore, the same effect as the control method 1 can be obtained. Further, in the control method No. 1, when the defrosting operation is not executed once, at least twice the first time H1 (16 hours in the above example) is not defrosted, whereas in the control method No. 2 Even if the defrosting operation is not executed once, if the time shortening condition is satisfied, the necessity of defrosting is determined when “first time H1 + second time H2 (12 hours in the above example)” has elapsed. Is judged.
Therefore, when frosting proceeds after the first time H1 has elapsed (when frosting may not be completely melted), appropriate measures are performed, so that frosting is left for a long time. The risk of being lost is eliminated.

FIG. 6 supplements the second example of the control method 2 and shows the execution timing of the defrosting operation.
In FIG. 6A, the defrost condition is satisfied every 8 hours, and the defrost operation is executed each time.
In FIG. 6B, although the defrost condition is not satisfied at 8:00, the time reduction condition is satisfied, and the defrost condition is satisfied at 12:00 and 20:00.
In FIG. 6C, although the defrost condition is not satisfied at 8:00 and 12:00, the time reduction condition is satisfied, and the defrost condition is satisfied at 16:00 and 24:00.
In FIG. 6D, the time reduction condition is not satisfied at 8:00 and 12:00, and the defrost condition is satisfied at 16:00 and 24:00.
In FIG. 6E, the defrost condition and the time reduction condition are not satisfied at 8:00, the time reduction condition is satisfied without the defrost condition at 16:00, and the defrost condition is set at 20:00. It is established.
In FIG. 6F, the time reduction condition is not satisfied at 8:00 and 16:00, and the defrost condition is satisfied at 24:00.

  According to the present invention, a defrosting operation without waste is performed, and good cooling and energy saving can be achieved. Therefore, it can be widely used as various vending machines.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Gas cooler 2f Outside fan 3 Branch part 4L On-off valve 4M On-off valve 4R On-off valve 5L Capillary (expansion means)
5M capillary (expansion means)
5R capillary (expansion means)
6L Left warehouse evaporator 6M Middle warehouse evaporator 6R Right warehouse evaporator 6f Inside fan 7 Junction point 8 Accumulator 9L Thermistor (temperature measuring means)
9M thermistor (temperature measurement means)
9R thermistor (temperature measurement means)
40L Left warehouse 40M Middle warehouse 40R Right warehouse 100 Refrigerant circuit 200 Cabinet 300 Insulating material 400 Product storage 403LM Partition plate 403MR Partition plate 405 Inner door 406 Front door 407 Product storage rack 408 Product guide plate 409 Product outlet 410 Storage of parts in the warehouse Chamber 420 Circulating duct 440 Internal heat exchanging means 450 Blower duct 460 Wind tunnel 470 Condensing unit 480 Machine room 490 Electrical component storage chamber 500 Internal temperature sensor 1000 Vending machine P1 Current temperature rise probability (temperature rise probability)
P2 Next temperature rise probability Pm Defrost probability Pn Time reduction probability Tj Measurement temperature (vaporizer temperature)
Tm Frost melting temperature S Product

Claims (4)

A housing that is surrounded by a heat insulating material and has an opening on one side, a heat insulating door that opens and closes the opening, a product storage that is partitioned by a partition plate disposed in the housing, and a cooling for the product storage Cooling means for,
The cooling means compresses the refrigerant, the condenser into which the refrigerant flowing out from the compressor flows in, the expansion means into which the refrigerant flowing out from the condenser flows in, and the refrigerant flowing out from the expansion means An evaporator installed in the product storage, and a refrigerant pipe for circulating the refrigerant by sequentially connecting the compressor, the condenser, the expansion means, the evaporator and the compressor,
The temperature of the evaporator is repeatedly measured over a predetermined time while intermittently supplying the refrigerant to the evaporator, and the temperature rising probability that the measured temperature of the evaporator exceeds a predetermined frost melting temperature is obtained. The vending machine is characterized in that the supply of the refrigerant is temporarily stopped immediately after the predetermined time has elapsed only when the temperature rising probability is equal to or less than the predetermined defrosting probability.   The temperature of the evaporator is repeatedly measured over the predetermined time while supplying refrigerant intermittently to the evaporator at each predetermined time, and the measured temperature of the evaporator exceeds a predetermined frost melting temperature. 2. The vending machine according to claim 1, wherein the temperature rising probability is obtained. A housing that is surrounded by a heat insulating material and has an opening on one side, a heat insulating door that opens and closes the opening, a product storage that is partitioned by a partition plate disposed in the housing, and a cooling for the product storage Cooling means for,
The cooling means compresses the refrigerant, the condenser into which the refrigerant flowing out from the compressor flows in, the expansion means into which the refrigerant flowing out from the condenser flows in, and the refrigerant flowing out from the expansion means An evaporator installed in the product storage, and a refrigerant pipe for circulating the refrigerant by sequentially connecting the compressor, the condenser, the expansion means, the evaporator and the compressor,
While the refrigerant is intermittently supplied to the evaporator, the temperature of the evaporator is repeatedly measured over a predetermined first time, and the temperature rise during the period when the measured evaporator temperature exceeds a predetermined frost melting temperature A first step of determining a probability;
Only when the current temperature increase probability is equal to or lower than the predetermined defrosting probability, the supply of the refrigerant is stopped immediately after the first time has elapsed, and then the refrigerant is intermittently supplied to the evaporator again. A second step of repeatedly measuring the temperature of the evaporator over the first time, and determining a next temperature rising probability that the measured temperature of the evaporator exceeds a predetermined frost melting temperature;
If the current temperature rise probability exceeds the predetermined defrost probability and is less than the predetermined time shortening probability, the refrigerant is intermittently supplied to the evaporator without stopping the supply of the refrigerant immediately after the first time has elapsed. The temperature of the evaporator is repeatedly measured over a second time shorter than the first time while supplying the temperature, and the next temperature rising probability that the measured evaporator temperature exceeds a predetermined frost melting temperature is obtained. The third step;
If the current temperature increase probability is equal to or greater than a predetermined time reduction probability, the refrigerant is intermittently supplied to the evaporator without stopping supply of the refrigerant immediately after the first time has elapsed. A fourth step of repeatedly measuring the temperature over the first time, and determining a next temperature rising probability that the measured evaporator temperature exceeds a predetermined frost melting temperature;
And after completing any of the second step, the third step, or the fourth step, the next stage temperature rise probability is read as the current period temperature rise probability in the first step, and the second step, A vending machine that executes either the third step or the fourth step.   An in-compartment fan for sending air toward the evaporator is installed, and the in-compartment fan is rotating while the supply of refrigerant is stopped immediately after the predetermined time has elapsed. The vending machine according to 1.

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