CN117663592A - Mechanical air-cooled refrigerator and control method thereof - Google Patents

Abstract

The invention relates to a mechanical air-cooled refrigerator and a control method thereof, wherein the mechanical air-cooled refrigerator comprises: a case defining a refrigerating chamber and a freezing chamber therein; a refrigeration system includes a condenser, a refrigerated warming tube, and a control valve assembly. The refrigerating and heating pipe is attached to the inner container wall of the refrigerating chamber and is connected with the output end of the condenser in parallel with a bypass pipeline; the control valve assembly is configured to selectively cause refrigerant exiting the condenser to flow to the refrigeration warming pipe or to the bypass line based on an ambient temperature of an ambient space in which the mechanical air-cooled refrigerator is located and a measured temperature within the refrigeration compartment. When the ambient temperature is lower, the refrigerant with higher temperature flowing out of the condenser flows to the refrigerating temperature rising pipe, and heat in the refrigerant is transferred to the inside of the refrigerating chamber, so that the temperature in the refrigerating chamber is increased, and the compressor is started to operate as soon as possible. The invention effectively utilizes the waste heat in the refrigerating system, has no extra heat input, reduces the cold energy loss and further reduces the energy consumption.

Description

Mechanical air-cooled refrigerator and control method thereof

Technical Field

The invention relates to a refrigeration technology, in particular to a mechanical air-cooled refrigerator and a control method thereof.

Background

Existing refrigeration temperature-controlled mechanical air-cooled refrigerators generally include a refrigerator compartment, a freezer compartment, an evaporator, a fan, an air duct assembly, a compressor, and the like. When the refrigerator compressor is operated, the fan is operated to bring the cooling capacity of the evaporator to the refrigerating chamber and the freezing chamber to achieve the refrigerating effect. The refrigeration principle of the refrigerator is as follows: the refrigerator control module controls the start and stop of the compressor through the actual temperature of the refrigerating chamber sensed by the temperature sensor in the refrigerating chamber; when the temperature of the sensor of the refrigerating chamber is increased to the temperature of the starting point of the compressor, the compressor is started and the fan is operated; when the temperature of the sensor of the refrigerating chamber is reduced to the temperature of the stop point of the compressor, the compressor is stopped, and the fan stops running.

When the mechanical air-cooled refrigerator is used in winter, the temperature difference between the external environment temperature and the interior of the refrigerating chamber is very small, even the external environment temperature is lower than the required temperature of the refrigerating chamber, under the condition, the compressor can reach the stop point temperature of the compressor only by operating the refrigerating chamber for a very short time, even the refrigerating chamber directly has no refrigerating request, and the refrigerating requirement of the refrigerating chamber can be met due to the external environment temperature. Because the compressor has short running time and even no refrigeration request, the temperature in the refrigerating chamber is only slightly lower than the refrigerating temperature and even the same as the refrigerating temperature, so that the food which needs to be refrigerated by a customer in winter cannot be stored normally, and the normal use of the customer is influenced.

In order to solve the technical problem, in the prior art, a compensation heater is generally added in the refrigerating chamber, and when the ambient temperature is low, the refrigerating chamber is heated to improve the starting rate of the compressor, so that the freezing chamber is ensured to have a low temperature. However, the compensation heater brings additional heat input to the refrigerator, not only increasing the cost of the refrigerator, but also increasing the power consumption of the refrigerator.

Disclosure of Invention

An object of the first aspect of the present invention is to overcome at least one of the drawbacks of the prior art and to provide a mechanical air-cooled refrigerator capable of ensuring that a freezing compartment still has a low storage temperature in a low-temperature environment without increasing energy consumption.

A further object of the first aspect of the invention is to avoid excessive low temperatures in the refrigeration compartment.

An object of the second aspect of the present invention is to provide a control method of a mechanical air-cooled refrigerator capable of ensuring that a freezing chamber still has a low storage temperature in a low-temperature environment without increasing energy consumption.

According to a first aspect of the present invention, there is provided a mechanical air-cooled refrigerator comprising:

a case defining a refrigerating chamber and a freezing chamber therein for storing articles; and

the refrigerating system comprises a condenser, a refrigerating and heating pipe and a control valve assembly; wherein the method comprises the steps of

The refrigerating and heating pipe is attached to the liner wall of the refrigerating chamber and is connected with the output end of the condenser in parallel with a bypass pipeline; the control valve assembly is configured to selectively cause refrigerant flowing from the condenser to flow to the refrigeration warming pipe or to the bypass pipe depending on an ambient temperature of an ambient space in which the mechanical air-cooled refrigerator is located and a measured temperature within the refrigeration compartment.

Optionally, the control valve assembly comprises a first control valve disposed in the bypass line, the first control valve configured to controllably communicate or block the bypass line; and is also provided with

The length of the first branch where the refrigerating and heating pipe is located is far greater than the length of the bypass pipeline, so that the refrigerant flowing out of the condenser only flows to the bypass pipeline when the first control valve is in an open state of conducting the bypass pipeline.

Optionally, the control valve assembly comprises a first control valve and a second control valve; wherein the method comprises the steps of

The first control valve is arranged in the bypass pipeline and is configured to controllably conduct or block the bypass pipeline; and is also provided with

The second control valve is arranged in a first branch where the refrigerating and heating pipe is located and is configured to controllably conduct or block the first branch.

Optionally, the refrigeration system further comprises a throttling device, an evaporator and a compressor; wherein the method comprises the steps of

The output end of the bypass pipeline and the output end of the first branch where the refrigerating and heating pipe is located are connected with the input end of the throttling device, the output end of the throttling device is connected with the input end of the evaporator, the output end of the evaporator is connected with the air return end of the compressor, and the exhaust end of the compressor is connected with the input end of the condenser.

According to a second aspect of the present invention, the present invention further provides a control method of a mechanical air-cooled refrigerator according to any one of the above schemes, including:

when a compressor and a fan of the mechanical air-cooled refrigerator are in a normal running state, acquiring the environment temperature of an environment space where the mechanical air-cooled refrigerator is positioned; and

when the ambient temperature is less than or equal to a first preset temperature and the measured temperature in the refrigerating chamber is less than or equal to a preset shutdown point temperature, the control valve assembly is adjusted to enable the refrigerant flowing out of the condenser to flow to the refrigerating heating pipe.

Optionally, when the ambient temperature is less than or equal to the first preset temperature and greater than a second preset temperature, and the measured temperature in the refrigerating chamber is less than or equal to a preset shutdown point temperature, the control method further includes:

controlling the compressor and the fan to stop running; wherein the method comprises the steps of

The first preset temperature is greater than the second preset temperature.

Optionally, in the normal running state, the compressor and the fan run according to a set rotation speed and a set duty cycle respectively; and is also provided with

When the ambient temperature is less than or equal to a second preset temperature and the measured temperature in the refrigerating chamber is less than or equal to a preset shutdown point temperature, the control method further comprises:

controlling the compressor and the fan to continuously operate at a target rotating speed lower than the set rotating speed and a target duty ratio lower than the set duty ratio respectively; wherein the method comprises the steps of

The second preset temperature is less than the first preset temperature.

Optionally, the target duty ratio of the blower is set such that the amount of cold driven by the blower and flowing into the refrigerating chamber is less than or equal to the amount of heat input to the refrigerating chamber; and/or

The target rotational speed of the compressor is a minimum rotational speed of the compressor.

Optionally, after controlling the compressor and the fan to operate at the target rotational speed and the target duty cycle, respectively, the control method further includes:

when the measured temperature of the refrigerating chamber is increased to a third preset temperature higher than the preset starting point temperature and lower than the preset closing point temperature, the compressor and the fan are controlled to stop running, and the state of the control valve component is maintained unchanged.

Optionally, the control method further includes:

when the ambient temperature is less than or equal to the first preset temperature and the measured temperature in the refrigerating chamber is greater than or equal to the preset starting point temperature, the compressor and the fan are controlled to start to operate, and the control valve assembly is adjusted to enable the refrigerant flowing out of the condenser to flow to the bypass pipeline.

Optionally, the control method further includes:

and adjusting the control valve assembly to enable the refrigerant flowing out of the condenser to flow to the bypass line when the ambient temperature is greater than the first preset temperature.

The refrigerating system of the mechanical air-cooled refrigerator is particularly provided with a refrigerating heating pipe and a control valve assembly, wherein the refrigerating heating pipe and the control valve assembly are attached to the inner wall of a refrigerating chamber, and the refrigerating heating pipe and a bypass pipeline are connected in parallel to the output end of a condenser. The control valve assembly can selectively enable the refrigerant flowing out of the condenser to flow to the refrigeration heating pipe or the bypass pipeline according to the ambient temperature of the ambient space where the mechanical air-cooled refrigerator is located and the measured temperature in the refrigeration chamber. Therefore, when the ambient temperature is lower, the refrigerant with higher temperature flowing out of the condenser flows to the refrigerating heating pipe through the control valve assembly, and heat in the refrigerant is transferred to the inside of the refrigerating chamber through the refrigerating heating pipe and the wall of the refrigerating liner, so that the temperature in the refrigerating chamber is improved, the compressor is promoted to start up and run as soon as possible, the starting rate of the compressor is improved, and the problem that the use of a user is influenced because the temperature in the refrigerating chamber cannot meet the refrigerating requirement when the ambient temperature is lower is avoided. The invention effectively utilizes the waste heat in the refrigerating system to heat the refrigerating chamber, replaces the compensation heating wire in the prior art, has no extra heat input, reduces the cold energy loss, and further reduces the energy consumption of the mechanical air-cooled refrigerator.

Further, during continued operation of the compressor and the fan, the target duty cycle of the fan is set such that the amount of cold driven by the fan and flowing into the refrigeration compartment is less than or equal to the amount of heat input to the refrigeration compartment, such that the temperature within the refrigeration compartment is still slowly rising or remains substantially unchanged. That is, the target duty ratio of the fan is small enough, most of the cooling air flow driven by the fan flows into the freezing chamber close to the fan, and even a small part of the cooling air flow does not flow into the refrigerating chamber far away from the fan, so that even if the compressor and the fan are in the running state, the temperature in the refrigerating chamber is not reduced continuously, the temperature in the freezing chamber is reduced effectively, and the food materials are prevented from being frozen due to too low temperature in the refrigerating chamber.

The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

fig. 1 is a schematic block diagram of a refrigerating system of a mechanical air-cooled refrigerator according to an embodiment of the present invention;

fig. 2 is a schematic block diagram of a refrigerating system of a mechanical air-cooled refrigerator according to another embodiment of the present invention;

fig. 3 is a schematic flowchart of a control method of a mechanical air-cooled refrigerator according to an embodiment of the present invention;

fig. 4 is a schematic flowchart of a control method of a mechanical air-cooled refrigerator according to another embodiment of the present invention;

fig. 5 is a schematic flowchart of a control method of a mechanical air-cooled refrigerator according to still another embodiment of the present invention.

Detailed Description

The invention firstly provides a mechanical air-cooled refrigerator, which comprises a refrigerator body and a refrigerating system. A refrigerating chamber and a freezing chamber for storing articles are defined in the case. Refrigeration systems are used to provide refrigeration to both the fresh food and freezer compartments.

Fig. 1 is a schematic block diagram of a refrigerating system of a mechanical air-cooled refrigerator according to an embodiment of the present invention. The refrigeration system 10 includes a condenser 11, a refrigerated warming duct 12, and a control valve assembly.

The refrigerating and heating pipe 12 is attached to the inner wall of the refrigerating chamber, and the refrigerating and heating pipe 12 is connected in parallel with a bypass pipe 13 to the output end of the condenser 11. The control valve assembly is configured to selectively cause the refrigerant flowing from the condenser 11 to flow to the refrigeration warming pipe 12 or to the bypass line 13 depending on the ambient temperature of the ambient space in which the mechanical air-cooled refrigerator is located and the measured temperature within the refrigeration compartment.

Therefore, when the ambient temperature is lower, the refrigerant with higher temperature flowing out of the condenser 11 can flow to the refrigerating and heating pipe 12 through the control valve component, heat in the refrigerant is transferred to the inside of the refrigerating chamber through the refrigerating and heating pipe 12 and the inner liner wall of the refrigerating chamber, the temperature in the refrigerating chamber is improved, the temperature in the refrigerating chamber reaches the starting point temperature of the refrigerating chamber as soon as possible, the compressor is promoted to start and run as soon as possible, the starting rate of the compressor is improved, and the problem that the temperature in the refrigerating chamber cannot reach the refrigerating requirement when the ambient temperature is lower and the use of a user is influenced is avoided.

When the ambient temperature is high, the refrigerant with high temperature flowing out of the condenser 11 can flow to the bypass pipeline 13 through the control valve assembly, and no refrigerant flows through the refrigerating and heating pipe 12 at this time, so that the heat of the refrigerant is not transferred to the refrigerating chamber, and the influence on the temperature of the refrigerating chamber is avoided. That is, when the ambient temperature is high, the refrigerant can flow according to a normal flow path, and the mechanical air-cooled refrigerator can also operate according to a normal control logic.

Normally, a small part of the heat contained in the refrigerant with relatively high temperature flowing out of the condenser 11 is dissipated by natural heat dissipation, and the other part of the heat needs to be throttled and depressurized by a throttling device, so that the temperature of the refrigerant can be reduced to a low enough degree to flow to the evaporator to further participate in heat exchange. Therefore, the heat contained in the refrigerant flowing out of the condenser 11 is waste heat inside the refrigeration system. The invention effectively utilizes the waste heat in the refrigerating system to heat the refrigerating chamber, replaces the compensation heating wire in the prior art, avoids the input of extra heat, reduces the cold energy loss, and further reduces the energy consumption of the mechanical air-cooled refrigerator.

In some embodiments, referring to fig. 1, the control valve assembly includes a first control valve 141 disposed in the bypass line 13, the first control valve 141 configured to controllably communicate or block the bypass line 13. That is, the first control valve 141 has an open state that conducts the bypass line 13 and a closed state that blocks the bypass line 13.

Further, the length of the first branch 15 where the refrigerating and heating line 12 is located is much longer than the length of the bypass line 13, so that the refrigerant flowing out of the condenser 11 flows only to the bypass line 13 when the first control valve 141 is in an open state where the bypass line 13 is conducted.

Specifically, when the length of the first branch 15 where the refrigeration and warming pipe 12 is located is much longer than the length of the bypass line 13, the line resistance encountered by the refrigerant flowing in the first branch 15 is much greater than the line resistance encountered by the refrigerant flowing in the bypass line 13. When the first control valve 141 is in the open state, the pressure difference across the bypass line 13 is much smaller than the pressure difference across the first branch line 15, so that the refrigerant flows only to the bypass line 13. When the first control valve 141 is in the closed state, the bypass line 13 is completely blocked, and thus the refrigerant flows only to the refrigerating and warming pipe 12.

Therefore, the present invention can flexibly adjust the flow direction of the refrigerant by only providing a first control valve 141 in the bypass line 13 by specially designing the length of the first branch line 15 where the refrigerating and heating pipe 12 is located and the length of the bypass line 13, thereby reducing the number of valve bodies and simplifying the structure of the refrigerating system 10.

It should be noted that, the first branch 15 where the refrigerating and heating pipe 12 is located refers to a pipeline connected in parallel to the bypass pipeline 13, and an input end and an output end of the first branch 15 are directly connected or overlapped with an input end and an output end of the bypass pipeline 13, respectively.

Fig. 2 is a schematic block diagram of a refrigerating system of a mechanical air-cooled refrigerator according to another embodiment of the present invention. In other embodiments, referring to fig. 2, the control valve assembly may include a first control valve 141 and a second control valve 142. The first control valve 141 is disposed in the bypass line 13 and is configured to controllably communicate or block the bypass line 13. That is, the first control valve 141 has an open state that conducts the bypass line 13 and a closed state that blocks the bypass line 13. The second control valve 142 is disposed in the first branch 15 where the cold-storage and warming pipe 12 is located, and is configured to controllably conduct or block the first branch 15. That is, the second control valve 142 has an open state of conducting the first branch 15 and a closed state of blocking the first branch 15.

When it is necessary to adjust the refrigerant flowing out of the condenser 11 to flow to the bypass line 13, the first control valve 141 is adjusted to an open state, and the second control valve 142 is adjusted to a closed state; when it is necessary to adjust the refrigerant flowing out of the condenser 11 to flow to the refrigerating and heating pipe 12, the first control valve 141 may be adjusted to a closed state, and the second control valve 142 may be adjusted to an open state. Thereby, it is possible to increase the control of the flow direction of all the refrigerant with high accuracy, and to avoid the problem that the temperature control of the refrigerating chamber is not accurate due to the partial flow of the refrigerant to the bypass line 13 and the partial flow of the refrigerant to the refrigerating and heating pipe 12.

In some embodiments, the refrigeration system 10 of the mechanical air-cooled refrigerator further includes a throttle device 18, an evaporator 16, and a compressor 17. The output end of the bypass pipeline 13 and the output end of the first branch 15 where the refrigerating and heating pipe 12 is located are connected with the input end of the throttling device 18, the output end of the throttling device 18 is connected with the input end of the evaporator 16, the output end of the evaporator 16 is connected with the air return end of the compressor 17, and the air discharge end of the compressor 17 is connected with the input end of the condenser 11, so that a relatively complete compression refrigeration cycle system is formed.

Specifically, the throttling device 18 may be a capillary tube, an electromagnetic throttle valve, or other suitable device capable of throttling and depressurizing. Since the operation of the compressor 17, condenser 11, throttle device 18 and evaporator 16, as well as other possible configurations of the refrigeration system 10, are readily known to those skilled in the art, further description thereof is omitted herein.

The invention also provides a control method of the mechanical air-cooled refrigerator based on any embodiment. The control method of the mechanical air-cooled refrigerator comprises the following steps:

when a compressor and a fan of the mechanical air-cooled refrigerator are in a normal running state, acquiring the environmental temperature of an environmental space in which the mechanical air-cooled refrigerator is positioned; and

when the ambient temperature is less than or equal to the first preset temperature and the measured temperature in the refrigerating chamber is less than or equal to the preset shutdown point temperature, the refrigerant flowing out of the condenser 11 flows to the refrigerating warming pipe 12 by adjusting the control valve assembly.

When the compressor and the fan are in a normal operation state, the cold energy is continuously input into the refrigerating chamber, and the measured temperature in the refrigerating chamber is gradually reduced. According to the mechanical air-cooled refrigerator, when the compressor and the fan are in a normal running state, the environment temperature of the environment space where the mechanical air-cooled refrigerator is located is obtained, and when the environment temperature is low and the measured temperature in the refrigerating chamber is reduced to be less than or equal to the preset shutdown point temperature, the compressor is stopped or runs at a low rotating speed, and at the moment, the temperature in the refrigerating chamber is slowly increased. Therefore, the control valve assembly is adjusted to enable the refrigerant flowing out of the condenser 11 to flow to the refrigerating and heating pipe 12, and heat in the refrigerant is sequentially transferred to the inside of the refrigerating chamber through the refrigerating and heating pipe 12 and the refrigerating liner wall, so that the temperature rising rate in the refrigerating chamber is accelerated, the starting rate of the compressor is further improved, and the temperature in the refrigerating chamber is still kept in a lower normal freezing range when the ambient temperature is lower.

In addition, the invention effectively utilizes the waste heat in the refrigerating system to heat the refrigerating chamber, replaces the compensation heating wire in the prior art, avoids additional heat input, reduces the cold energy loss, and further reduces the energy consumption of the mechanical air-cooled refrigerator.

Specifically, fig. 3 is a schematic flowchart of a control method of a mechanical air-cooled refrigerator according to an embodiment of the present invention, and referring to fig. 3, the control method of the mechanical air-cooled refrigerator of the present invention includes:

step S10, acquiring the environmental temperature of an environmental space where the mechanical air-cooled refrigerator is located when a compressor and a fan of the mechanical air-cooled refrigerator are in a normal running state;

step S20, judging whether the ambient temperature is less than or equal to a first preset temperature; if yes, go to step S30;

step S30, judging whether the measured temperature in the refrigerating chamber is less than or equal to the preset shutdown point temperature; that is, judging whether the measured temperature in the refrigerating chamber is reduced to or below the preset shutdown point temperature; if yes, go to step S40;

in step S40, the control valve assembly is adjusted so that the refrigerant flowing out of the condenser 11 flows to the refrigerating and heating pipe 12.

Further, in order to more precisely control the temperatures in the refrigerating chamber and the freezing chamber, the case that the ambient temperature is equal to or lower than the first preset temperature may be further subdivided into two cases that the ambient temperature is equal to or lower than the first preset temperature and is equal to or higher than the second preset temperature and is equal to or lower than the second preset temperature.

Specifically, when the ambient temperature is less than or equal to the first preset temperature and greater than the second preset temperature, and the measured temperature in the refrigerating chamber is less than or equal to the preset shutdown point temperature, the control method of the present invention further includes:

and controlling the compressor and the fan to stop running, wherein the first preset temperature is higher than the second preset temperature.

That is, when the ambient temperature is low, but not too low, the effect of the ambient temperature on the compressor on-rate is limited. Therefore, if the measured temperature in the refrigerating chamber reaches the preset shutdown point temperature, the compressor and the fan are still controlled to be shut down. On the one hand, after the compressor is stopped, the discharge end and the return end of the compressor still have a high pressure difference, and under the action of the pressure difference, the refrigerant still flows in the refrigeration system at a low speed, and the refrigerant flowing out of the condenser 11 flows through the refrigeration heating pipe 12 at a low speed, so that heat contained in the refrigerant is transferred to the refrigeration chamber. Because the influence of the ambient temperature on the temperature of the refrigerating chamber is limited, the refrigerating chamber can meet the requirement of the starting rate of the compressor by less temperature compensation. On the other hand, the compressor and the fan are stopped, so that the refrigerating chamber can not be continuously refrigerated, and the food materials are prevented from being frozen due to further reduction of the measured temperature of the refrigerating chamber.

In the normal operation state described in step S10, the compressor and the fan are operated at the set rotational speed and the set duty ratio, respectively. Specifically, the refrigerating chamber may have a plurality of different temperature steps, each of which corresponds to a set rotational speed of one compressor and a set duty cycle of the blower. Namely, when the gear setting of the refrigerating chamber is different, different compressor setting rotating speeds and different fan setting duty ratios can be corresponding. The control method of the invention is based on the fact that the refrigerating chambers are in the same temperature gear.

In some embodiments, when the ambient temperature is less than or equal to the second preset temperature and the measured temperature in the refrigerating chamber is less than or equal to the preset shutdown point temperature, the control method of the present invention further includes:

controlling the compressor and the fan to continuously operate at a target rotating speed lower than the set rotating speed and a target duty ratio lower than the set duty ratio respectively; wherein the second preset temperature is less than the first preset temperature.

When the compressor and the fan are in a normal operation state, the cold energy is continuously input into the refrigerating chamber, and the measured temperature in the refrigerating chamber is gradually reduced. When the ambient temperature is too low (for example, less than or equal to the second preset temperature) and the measured temperature in the refrigerating chamber is reduced to the preset shutdown point temperature, the invention does not stop the compressor and the fan immediately as in the prior art, but controls the compressor to continue to run at a low speed and controls the fan to continue to run at a lower duty cycle. On one hand, the time of stopping the compressor is delayed, the running time of the compressor is prolonged, and the freezing chamber is ensured to have enough cold energy input to be kept at a lower temperature, so that the problem that the freezing temperature cannot reach the freezing requirement when the ambient temperature is lower and the use of a user is influenced is effectively avoided; on the other hand, the compressor and the fan are continuously operated, and the refrigerant can continuously absorb the heat of the freezing chamber, so that the temperature of the refrigerant flowing to the refrigerating and heating pipe 12 is higher, and the temperature in the refrigerating chamber is further effectively increased.

Specifically, fig. 4 is a schematic flowchart of a control method of a mechanical air-cooled refrigerator according to another embodiment of the present invention, referring to fig. 4, the control method of the mechanical air-cooled refrigerator of the present invention includes:

step S10, acquiring the environmental temperature of an environmental space where the mechanical air-cooled refrigerator is located when a compressor and a fan of the mechanical air-cooled refrigerator are in a normal running state;

step S21, judging whether the ambient temperature is less than or equal to a first preset temperature and greater than a second preset temperature; if yes, go to step S31; if not, go to step S22;

step S31, judging whether the measured temperature in the refrigerating chamber is less than or equal to the preset shutdown point temperature; if yes, go to step S41;

step S41, enabling the refrigerant flowing out of the condenser 11 to flow to the refrigerating and heating pipe 12 by adjusting the control valve assembly, and controlling the compressor and the fan to stop running;

step S22, judging whether the ambient temperature is less than or equal to a second preset temperature; if yes, go to step S32;

step S32, judging whether the measured temperature in the refrigerating chamber is less than or equal to the preset shutdown point temperature; if yes, go to step S42;

in step S42, the control valve assembly is adjusted so that the refrigerant flowing out of the condenser 11 flows to the refrigerating and heating pipe 12, and the compressor and the fan are controlled to continue to operate at a target rotation speed lower than the set rotation speed and a target duty ratio lower than the set duty ratio, respectively.

In some embodiments, the target rotational speed of the compressor is a minimum rotational speed of the compressor.

In some embodiments, the target duty cycle of the blower is set such that the amount of cold driven by the blower and flowing into the refrigerator compartment is less than or equal to the amount of heat input to the refrigerator compartment. During the continuous operation of the compressor and the fan, the rotating speed of the compressor is lower, and the cold energy generated by the evaporator is less; and, the target duty ratio of the blower is set such that the amount of cold driven by the blower and flowing into the refrigerating compartment is less than or equal to the amount of heat input into the refrigerating compartment, so that the temperature in the refrigerating compartment is still slowly raised or remains substantially unchanged. That is, the target duty ratio of the fan is small enough, most of the cooling air flow driven by the fan flows into the freezing chamber close to the fan, and even a small part of the cooling air flow does not flow into the refrigerating chamber far away from the fan, so that even if the compressor and the fan are in the running state, the temperature in the refrigerating chamber is not reduced continuously, the temperature in the freezing chamber is reduced effectively, and the food materials are prevented from being frozen due to too low temperature in the refrigerating chamber.

It will be appreciated that the heat input to the refrigeration compartment may originate from the external environment or from the food within the refrigeration compartment. For example, outside air may enter the fresh food compartment through the refrigerator door seal, and the heat carried by the air also enters the fresh food compartment.

However, the fan is closer to the freezer compartment, and even if the fan is operated at a smaller target duty cycle, the cooling air flow is still caused to effectively flow into the freezer compartment, thereby causing the temperature within the freezer compartment to decrease. Therefore, the control of the duty ratio of the fan can not greatly influence the temperature of the refrigerating chamber, but also can effectively reduce the temperature in the freezing chamber, and the design is ingenious.

It will be appreciated that the target duty cycle described above can be achieved through extensive experimental verification, i.e. it can be ensured that the temperature in the refrigerated compartment increases slowly when the fan is operated at the target duty cycle. Preferably, the target duty cycle of the fan is 40% or less. The inventor finds through many experiments that when the operating duty ratio of the fan is less than or equal to 40%, most of cooling air flow driven by the fan flows into the freezing chamber, and little or no cooling air flow flows into the refrigerating chamber, so that the requirement on the target duty ratio of the fan is just met.

Preferably, in the range of 40% or less, the target duty ratio of the blower may be appropriately adjusted according to actual conditions.

In some embodiments, after controlling the compressor and the fan to operate at the target rotational speed and the target duty cycle, respectively, and adjusting the control valve assembly such that the refrigerant flowing out of the condenser 11 flows to the refrigerated warming duct 12, the control method of the present invention further comprises:

when the measured temperature of the refrigerating chamber is increased to a third preset temperature which is higher than the preset starting point temperature and lower than the preset closing point temperature, the compressor and the fan are controlled to stop running, and the state of the control valve component is maintained unchanged. That is, at this time, the compressor and the fan are stopped, but the control valve assembly is still maintained in a state in which the refrigerant flowing out of the condenser 11 flows to the refrigerating warming pipe 12.

As described above, when the measured temperature of the refrigerating chamber is reduced to the preset shutdown point temperature, the present invention controls the compressor and the fan to continue to operate at the target rotational speed and the target duty ratio, respectively, and when the measured temperature in the refrigerating chamber is increased to the third preset temperature between the preset shutdown point temperature and the preset startup point temperature, the present invention controls the compressor and the fan to stop, so that the compressor and the fan can be ensured to have a shutdown state, and the burden caused by the continuous operation of the compressor and the fan is avoided.

Specifically, the third preset temperature may be any temperature value between a preset on-point temperature and a preset off-point temperature. Preferably, the absolute value of the difference between the third preset temperature and the preset on-point temperature and the absolute value of the difference between the third preset temperature and the preset off-point temperature are approximately equal.

Specifically, fig. 5 is a schematic flowchart of a control method of a mechanical air-cooled refrigerator according to still another embodiment of the present invention, referring to fig. 5, the control method of the mechanical air-cooled refrigerator of the present invention includes:

step S10, acquiring the environmental temperature of an environmental space where the mechanical air-cooled refrigerator is located when a compressor and a fan of the mechanical air-cooled refrigerator are in a normal running state;

step S21, judging whether the ambient temperature is less than or equal to a first preset temperature and greater than a second preset temperature; if yes, go to step S31; if not, go to step S22;

step S31, judging whether the measured temperature in the refrigerating chamber is less than or equal to the preset shutdown point temperature; if yes, go to step S41;

step S41, enabling the refrigerant flowing out of the condenser 11 to flow to the refrigerating and heating pipe 12 by adjusting the control valve assembly, and controlling the compressor and the fan to stop running;

step S22, judging whether the ambient temperature is less than or equal to a second preset temperature; if yes, go to step S32;

step S32, judging whether the measured temperature in the refrigerating chamber is less than or equal to the preset shutdown point temperature; if yes, go to step S42;

step S42, the control valve assembly is adjusted to enable the refrigerant flowing out of the condenser 11 to flow to the refrigerating and heating pipe 12, and the compressor and the fan are controlled to continuously operate at a target rotating speed lower than the set rotating speed and a target duty ratio lower than the set duty ratio respectively;

step S43, judging whether the measured temperature of the refrigerating chamber reaches a third preset temperature, if so, turning to step S44;

and step S44, controlling the compressor and the fan to stop running, and maintaining the state of the control valve assembly unchanged.

In some embodiments, the control method of the present invention further comprises:

when the ambient temperature is less than or equal to the first preset temperature and the measured temperature in the refrigerating chamber is greater than or equal to the preset starting point temperature, the compressor and the fan are controlled to start to operate, and the control valve assembly is adjusted to enable the refrigerant flowing out of the condenser 11 to flow to the bypass pipeline 13.

That is, even if the ambient temperature is low, if the measured temperature in the refrigerating chamber reaches the preset starting point temperature, the compressor and the fan are started at this time, and the refrigerant flows through the bypass line 13, so as to avoid that the temperature of the refrigerant is transferred to the inside of the refrigerating chamber through the refrigerating temperature increasing pipe 12, and the temperature in the refrigerating chamber is not reduced later.

In some embodiments, the control method of the present invention further comprises:

when the ambient temperature is greater than the first preset temperature, the control valve assembly is adjusted such that the refrigerant flowing from the condenser 11 flows to the bypass line 13.

That is, when the ambient temperature is greater than the first preset temperature, the control valve assembly is in a state of allowing the refrigerant flowing out of the condenser 11 to flow to the bypass line 13 regardless of the measured temperature of the refrigerating chamber. When the ambient temperature is high, the starting rate of the compressor is hardly affected, and the problem of high temperature in the refrigerating chamber does not exist, so that the refrigerating chamber does not need to be subjected to temperature compensation.

In some embodiments, the mechanical air-cooled refrigerator further comprises a ring temperature detection device, a refrigeration temperature detection device, and a control device connected with the ring temperature detection device and the refrigeration temperature detection device. The ring temperature detection device is used for detecting the environmental temperature of the environmental space where the mechanical air-cooled refrigerator is located. The refrigerating temperature detection device is used for detecting the actually measured temperature in the refrigerating chamber. The control device comprises a processor and a memory, wherein the memory stores a machine executable program, and the machine executable program is used for realizing the control method described in any one of the embodiments above when being executed by the processor.

Specifically, the environment detection device and the refrigeration temperature detection device may be devices capable of acquiring a temperature value, such as a temperature sensor and a temperature sensing head.

It should be understood by those skilled in the art that the above-described embodiments are only a part of embodiments of the present invention, and not all embodiments of the present invention, and the part of embodiments is intended to explain the technical principles of the present invention and not to limit the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive effort, based on the embodiments provided by the present invention, shall still fall within the scope of protection of the present invention.

It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

In addition, in the description of the present invention, each functional module may be a physical module formed by a plurality of structures, members, or electronic components, or may be a virtual module formed by a plurality of programs; the functional modules may be independent modules or may be functionally divided by a single integral module. It should be understood by those skilled in the art that, on the premise of being able to implement the technical solution described in the present invention, the structural manner, implementation manner and positional relationship of each functional module do not deviate from the technical principle of the present invention anyway, and therefore all functional modules fall within the protection scope of the present invention.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (11)

1. A mechanical air-cooled refrigerator, comprising:

a case defining a refrigerating chamber and a freezing chamber therein for storing articles; and

the refrigerating system comprises a condenser, a refrigerating and heating pipe and a control valve assembly; wherein the method comprises the steps of

The refrigerating and heating pipe is attached to the liner wall of the refrigerating chamber and is connected with the output end of the condenser in parallel with a bypass pipeline; the control valve assembly is configured to selectively cause refrigerant flowing from the condenser to flow to the refrigeration warming pipe or to the bypass pipe depending on an ambient temperature of an ambient space in which the mechanical air-cooled refrigerator is located and a measured temperature within the refrigeration compartment.

2. The mechanical air-cooled refrigerator of claim 1, wherein

The control valve assembly includes a first control valve disposed in the bypass line, the first control valve configured to controllably communicate or block the bypass line; and is also provided with

The length of the first branch where the refrigerating and heating pipe is located is far greater than the length of the bypass pipeline, so that the refrigerant flowing out of the condenser only flows to the bypass pipeline when the first control valve is in an open state of conducting the bypass pipeline.

3. The mechanical air-cooled refrigerator of claim 1, wherein

The control valve assembly includes a first control valve and a second control valve; wherein the method comprises the steps of

The first control valve is arranged in the bypass pipeline and is configured to controllably conduct or block the bypass pipeline; and is also provided with

The second control valve is arranged in a first branch where the refrigerating and heating pipe is located and is configured to controllably conduct or block the first branch.

4. The mechanical air-cooled refrigerator of claim 1, wherein

The refrigeration system further comprises a throttling device, an evaporator and a compressor; wherein the method comprises the steps of

The output end of the bypass pipeline and the output end of the first branch where the refrigerating and heating pipe is located are connected with the input end of the throttling device, the output end of the throttling device is connected with the input end of the evaporator, the output end of the evaporator is connected with the air return end of the compressor, and the exhaust end of the compressor is connected with the input end of the condenser.

5. A control method of the mechanical air-cooled refrigerator according to any one of claims 1 to 4, comprising:

when a compressor and a fan of the mechanical air-cooled refrigerator are in a normal running state, acquiring the environment temperature of an environment space where the mechanical air-cooled refrigerator is positioned; and

when the ambient temperature is less than or equal to a first preset temperature and the measured temperature in the refrigerating chamber is less than or equal to a preset shutdown point temperature, the control valve assembly is adjusted to enable the refrigerant flowing out of the condenser to flow to the refrigerating heating pipe.

6. The control method according to claim 5, wherein

When the ambient temperature is less than or equal to the first preset temperature and greater than a second preset temperature, and the measured temperature in the refrigerating chamber is less than or equal to a preset shutdown point temperature, the control method further includes:

controlling the compressor and the fan to stop running; wherein the method comprises the steps of

The first preset temperature is greater than the second preset temperature.

7. The control method according to claim 5, wherein

In the normal running state, the compressor and the fan respectively run according to a set rotating speed and a set duty ratio; and is also provided with

When the ambient temperature is less than or equal to a second preset temperature and the measured temperature in the refrigerating chamber is less than or equal to a preset shutdown point temperature, the control method further comprises:

controlling the compressor and the fan to continuously operate at a target rotating speed lower than the set rotating speed and a target duty ratio lower than the set duty ratio respectively; wherein the method comprises the steps of

The second preset temperature is less than the first preset temperature.

8. The control method according to claim 7, wherein

The target duty ratio of the blower is set such that the amount of cold driven by the blower and flowing into the refrigerating chamber is less than or equal to the amount of heat input to the refrigerating chamber; and/or

The target rotational speed of the compressor is a minimum rotational speed of the compressor.

9. The control method according to claim 8, wherein

After controlling the compressor and the blower to operate at the target rotational speed and the target duty cycle, respectively, the control method further includes:

when the measured temperature of the refrigerating chamber is increased to a third preset temperature higher than the preset starting point temperature and lower than the preset closing point temperature, the compressor and the fan are controlled to stop running, and the state of the control valve component is maintained unchanged.

10. The control method according to claim 5, further comprising:

when the ambient temperature is less than or equal to the first preset temperature and the measured temperature in the refrigerating chamber is greater than or equal to the preset starting point temperature, the compressor and the fan are controlled to start to operate, and the control valve assembly is adjusted to enable the refrigerant flowing out of the condenser to flow to the bypass pipeline.

11. The control method according to claim 5, further comprising:

and adjusting the control valve assembly to enable the refrigerant flowing out of the condenser to flow to the bypass line when the ambient temperature is greater than the first preset temperature.