An anti-frost system

Abstract

The present invention discloses an anti-frost system, including a control system, an air compressor, an air storage tank, a first refrigerated air dryer, a first control valve, a differential pressure sensor and a cold storage, wherein the control system is connected to the air compressor, the air compressor is connected to the air storage tank, the air storage tank is connected to the first refrigerated air dryer, the cold storage is connected to the differential pressure sensor, the differential pressure sensor is connected to the control system, the control system is connected to the first control valve, the first control valve is connected to the first refrigerated air dryer, and the first control valve is connected to the cold storage. The anti-frost system disclosed by the present invention stores the compressed air compressed by the air compressor in the air storage tank first, and the air storage tank has a natural cooling process, and then the air storage tank is connected to the first refrigerated air dryer for connection drying and refrigeration, which greatly reduces energy consumption and improves economy.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration, in particular to an anti-frost system. Background Art

[0002] In the field of medical device industry, relevant policies and laws require that blood samples should be processed as soon as possible after collection and stored at a specified temperature of 2-8°C. At present, if relevant testing experiments cannot be carried out immediately after blood samples are collected, the common practice is to place the blood samples in a refrigerator (or freezer) and store them at a temperature of 2-8°C. When the samples need to be tested, they are manually taken out of the refrigerator (or freezer) for testing. If the blood sample assembly line operation is required, ordinary refrigerators (or freezers) cannot realize automatic storage and retrieval, which obviously cannot meet the requirements.

[0003] With the development of science and technology, automated cold storage is gradually being introduced to the market. Automated cold storage faces two important problems: First, the temperature fluctuations in the cold storage cause the stored items to undergo a solid freezing and thawing process, especially the large fluctuations in the temperature inside the cold storage caused by opening and closing the cold storage door during the storage and retrieval of items. The quality of the stored items in the cold storage is easily affected; Second, in the area where the low-temperature environment inside the cold storage is combined with the relatively high-temperature environment outside, heat exchange is likely to occur, causing frost or mist condensation, thereby affecting the continuous and effective operation of the automated device. For example, the automated device at the insulation door of the automated cold storage is most prone to frost or fogging, which will cause the corresponding automated device to fail. In the prior art, such as in patents CN206019134U and CN106152679A, the temperature fluctuation range of the automated cold storage is controlled by designing a buffer chamber, and an air curtain is used at the cold storage door to block the outside air from entering the cold storage. However, the design of the air curtain will allow some air to bring in water vapor when entering the cold storage, and the water vapor will freeze when it encounters cold. Therefore, at present, there is still a lot of room for technical improvement in the problem of frost or fog condensation at the automated cold storage door when opening and closing the cold storage door during the process of storing and retrieving items. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the present invention provides an anti-frost system.

[0005] The present invention is achieved through the following technical solutions:

[0006] An anti-frost system comprises a control system, an air compressor, an air storage tank, a first refrigerated air dryer, a first control valve, a differential pressure sensor and a cold storage, wherein the control system is connected to the air compressor, the air compressor is connected to the air storage tank, the air storage tank is connected to the first refrigerated air dryer, the cold storage is connected to the differential pressure sensor, the differential pressure sensor is connected to the control system, the control system is connected to the first control valve, the first control valve is connected to the first refrigerated air dryer, and the first control valve is connected to the cold storage;

[0007] The air storage tank is used to store compressed air compressed by the air compressor;

[0008] The first refrigerated air dryer is used to cool and dry the compressed air in the air storage tank to ensure that the compressed air entering the cold storage is dry to avoid bringing water vapor into the cold storage;

[0009] The differential pressure sensor is used to detect the internal pressure of the cold storage and the external pressure of the cold storage;

[0010] The control system is used to calculate the pressure difference according to the current internal pressure and external pressure of the cold storage; when the pressure difference reaches a first set value, the control system generates a first instruction, and sends the first instruction to the first control valve to open the first control valve, at which time the low-temperature dry air passing through the first refrigerated air dryer is supplemented into the cold storage; when the pressure difference is not less than a first equilibrium value, the control system generates a second instruction, and sends the second instruction to the first control valve to close the first control valve;

[0011] The first control valve is used to receive the first instruction and the second instruction sent by the control system; according to the first instruction and the second instruction, the first control valve is selectively opened, and the low-temperature dry air passing through the first refrigerated air dryer can be transmitted to the inside of the cold storage, so that the pressure inside the cold storage is greater than the pressure outside the cold storage or the internal and external pressures of the cold storage are balanced, thereby destroying the conditions for exchanging heat inside and outside the cold storage.

[0012] Usually, the temperature of air compressed by an air compressor is around 50°C, and the outside temperature is usually around 30°C. In the above technical solution, the compressed air compressed by the air compressor is first stored in an air tank, and the air tank undergoes a natural cooling process. Then, the air tank is connected to the first refrigerated air dryer for drying and refrigeration, which greatly reduces energy consumption and improves economy.

[0013] Furthermore, at least one oil mist separator is connected between the air compressor and the air storage tank, which is used to remove and purify the oil mist of the compressed air compressed by the air compressor before it enters the air storage tank for storage. After the oil mist is collected, what is discharged is relatively clean compressed air, thereby purifying the compressed air.

[0014] Furthermore, at least one filter device is connected between the first control valve and the first refrigerated air dryer. The compressed air in the gas storage tank is filtered through the filter device to remove impurities in the compressed air to ensure that the compressed air entering the cold storage is clean. The filter device can be a plurality of groups, which filter particles of different sizes respectively to obtain the required clean gas. When the control system sends a first instruction to the first control valve and opens the first control valve, the compressed air in the gas storage tank is cooled and dried by the first refrigerated air dryer, and then filtered by the filter device to remove impurities and then transported to the cold storage.

[0015] Furthermore, it also includes a first pressure sensor, the control system is connected to the first pressure sensor, and the first pressure sensor is connected to the gas storage tank;

[0016] The first pressure sensor is used to monitor the pressure of the gas storage tank and feed back to the control system, and the control system receives the current pressure value of the gas storage tank;

[0017] When the current pressure value of the air storage tank reaches the second set value, the control system generates a third instruction, and sends the third instruction to the air compressor to turn on the air compressor to replenish the compressed air to the air storage tank, that is, the air compressor delivers compressed air to the air storage tank to replenish the compressed air in the air storage tank;

[0018] When the current pressure value of the air storage tank reaches the third set value, the control system generates a fourth instruction and sends a fourth instruction to the air compressor to turn off the air compressor. The above technical solution monitors the pressure in the air storage tank in real time through the first pressure sensor to ensure that the compressed air in the air storage tank is always sufficient, and ensures that when cold air needs to be transported to the cold storage, the compressed air in the air storage tank can fully supply the cold air transportation demand.

[0019] Further, the cold storage includes a storage body, and a hatch and an inspection door are provided on the storage body. The hatch is used for refrigerated items to enter and exit the storage, and the inspection door is used to enter the cold storage by opening the inspection door when manual entry into the cold storage for maintenance is required. The hatch is connected to a first sensing device, and the inspection door is connected to a second sensing device. The first sensing device and the second sensing device are connected to a control system;

[0020] The first sensing device is used to sense the opening and closing of the door, and feed back the opening and closing signals of the door to the control system;

[0021] The second sensing device is used to sense the opening and closing of the inspection door, and feed back the opening and closing signals of the inspection door to the control system;

[0022] The control system is used to receive signals fed back by the first sensing device and the second sensing device, and the control system selectively controls the opening and closing of the first control valve according to the received signals.

[0023] Further, when the control system receives a signal from the first sensing device or the second sensing device that the hatch or the inspection door is open, the control system generates a fifth instruction and sends the fifth instruction to the first control valve to open the first control valve, and the low-temperature dry air passing through the first refrigerated air dryer is then added to the cold storage; when the control system receives a signal from the first sensing device or the second sensing device that the hatch or the inspection door is closed, and the control system calculates the pressure difference according to the current internal pressure and external pressure of the cold storage to be not less than the first balance value, the control system generates a sixth instruction and sends the sixth instruction to the first control valve to close the first control valve. The first sensing device and the second sensing device sense the opening and closing states of the hatch and the inspection door respectively, and when the first sensing device and the second sensing device sense that the hatch or the inspection door is in the open state, the signal of the opening state of the hatch or the inspection door is fed back to the control system, and the control system controls the first control valve to open, and transmits the low-temperature dry air passing through the first refrigerated air dryer to the cold storage, so that the pressure inside the cold storage is greater than the pressure outside the cold storage or the pressure inside and outside the cold storage is balanced.

[0024] Therefore, the technical solution senses the opening and closing states of the hatch and the inspection door respectively through the first sensing device and the second sensing device. When the first sensing device and the second sensing device sense that the hatch or the inspection door is in the open state, the signal of the opening state of the hatch or the inspection door is fed back to the control system, and the first control valve is controlled to open by the control system to transmit the low-temperature dry air passing through the first refrigerated air dryer to the cold storage, and automatically replenish the low-temperature dry compressed air into the cold storage, so as to increase the pressure inside the storage to be greater than the external pressure of the cold storage or to balance the internal and external pressures of the cold storage, prevent the heat exchange between the inside and outside of the cold storage due to the opening of the hatch or the inspection door, and prevent the external hot air from entering the cold storage, thereby avoiding ice or frost inside the cold storage, the hatch, the inspection door and other connecting parts inside and outside the storage.

[0025] Furthermore, it also includes at least one spare gas cylinder and a second control valve matching the number of spare gas cylinders, the spare gas cylinder and the second control valve are arranged inside the cold storage, the spare gas cylinder is connected to the second control valve, and the second control valve is connected to the control system;

[0026] The spare gas cylinder is used to store low-temperature dry compressed air;

[0027] The control system selectively sends a seventh instruction to the second control valve to open the second control valve according to whether the first control valve responds to the first instruction and the difference between the pressure difference between the internal pressure and the external pressure of the cold storage for a set time after the first control valve is opened and the first equilibrium value, and the second control valve is opened. At this time, the low-temperature dry compressed air in the spare gas cylinder is replenished into the cold storage. Specifically, there are the following situations:

[0028] When the control system sends the first instruction to the first control valve and the first control valve does not respond, the control system sends the seventh instruction to the second control valve to open the second control valve, and uses the low-temperature and dry compressed air in the spare gas cylinder to replenish the cold storage in time. The control system is used to calculate the pressure difference according to the current internal pressure and external pressure of the cold storage. When the pressure difference reaches not less than the first equilibrium value, the control system generates the eighth instruction and sends the eighth instruction to the second control valve to close the second control valve.

[0029] When the first pressure sensor fails to monitor the pressure of the air tank, the compressed air cannot be replenished in the air tank in time. Even if the first control valve is opened and the dry compressed air is continuously replenished, within the set time length, the pressure difference calculated by the control system based on the internal pressure and external pressure detected by the differential pressure sensor still fails to reach the first equilibrium value, that is, the pressure difference between the inside and outside of the cold storage is still less than the first equilibrium value. The control system sends the seventh instruction to the second control valve to open the second control valve, and use the low-temperature dry compressed air in the spare gas cylinder to replenish the cold storage in time. The control system calculates the pressure difference based on the current internal pressure and external pressure of the cold storage. When the pressure difference reaches no less than the first equilibrium value, the control system generates the eighth instruction, and sends the eighth instruction to the second control valve to close the second control valve.

[0030] Furthermore, it also includes a terminal display, which is connected to the control system. The spare gas cylinder is also connected to a second pressure sensor, which is connected to the control system. The second pressure sensor is used to monitor the pressure of the spare gas cylinder and feed back to the control system. The control system receives the current pressure value of the spare gas cylinder; when the current pressure value of the spare gas cylinder reaches a fourth set value, the control system generates a ninth instruction and sends the ninth instruction to the terminal display, prompting the user to replace the spare gas cylinder to ensure that there is sufficient low-temperature dry compressed air in the spare gas cylinder for backup.

[0031] Furthermore, it also includes an auxiliary air storage tank, a second refrigerated air dryer and a third control valve, the air compressor is connected to the auxiliary air storage tank, the auxiliary air storage tank is connected to the second refrigerated air dryer, the second refrigerated air dryer is connected to the third control valve, the control system is connected to the third control valve, and the third control valve is connected to the cold storage; the control system calculates the pressure difference according to the current internal pressure and external pressure of the cold storage, when the pressure difference reaches a first set value, the control system generates a first instruction, and sends the first instruction to the first control valve to open the first control valve, the control system generates a tenth instruction, and sends the tenth instruction to the third control valve to open the third control valve; when the pressure difference is not less than the first balance value, the control system generates a second instruction, and sends the second instruction to the first control valve to close the first control valve, the control system generates an eleventh instruction, and sends the eleventh instruction to the third control valve to close the third control valve.

[0032] Through the above technical scheme, when it is necessary to supplement the cold storage with low-temperature dry compressed air, the low-temperature dry air dried by the first refrigerated air dryer and the second refrigerated air dryer is simultaneously supplemented into the cold storage, so as to quickly promote the pressure inside the cold storage to be greater than the pressure outside the cold storage or the pressure inside and outside the cold storage to be balanced, greatly shortening the time to reach the point where the pressure inside the cold storage is greater than the pressure outside the cold storage or the pressure inside and outside the cold storage are balanced, and avoiding possible ice or frost problems inside the cold storage due to too long supplementation time of low-temperature dry compressed air.

[0033] Furthermore, it also includes a third pressure sensor, the control system is connected to the third pressure sensor, and the third pressure sensor is connected to the auxiliary gas storage tank;

[0034] The third pressure sensor is used to monitor the pressure of the auxiliary gas storage tank and feed back to the control system, and the control system receives the current pressure value of the auxiliary gas storage tank;

[0035] When the current pressure value of the auxiliary air storage tank reaches the second set value, the control system generates a twelfth instruction, and sends the twelfth instruction to the air compressor to turn on the air compressor to replenish the auxiliary air storage tank with compressed air, that is, the air compressor delivers compressed air to the auxiliary air storage tank to replenish the compressed air in the auxiliary air storage tank;

[0036] When the current pressure value of the auxiliary air storage tank reaches a third set value, the control system generates a thirteenth instruction, and sends the thirteenth instruction to the air compressor to shut down the air compressor.

[0037] The above technical solution monitors the pressure in the auxiliary air tank in real time through the third pressure sensor to ensure that the compressed air in the auxiliary air tank can always remain sufficient, and ensure that when cold air needs to be transported to the inside of the cold storage, the compressed air in the auxiliary air tank can fully assist in supplying the cold air delivery demand.

[0038] Combined with the structural features of the present invention, compared with the prior art, the present invention provides an anti-frost system, including a control system, an air compressor, an air storage tank, a first refrigerated air dryer, a first control valve, a differential pressure sensor and a cold storage, wherein the control system is connected to the air compressor, the air compressor is connected to the air storage tank, the air storage tank is connected to the first refrigerated air dryer, the cold storage is connected to the differential pressure sensor, the differential pressure sensor is connected to the control system, the control system is connected to the first control valve, the first control valve is connected to the first refrigerated air dryer, and the first control valve is connected to the cold storage. Usually, the temperature of air compressed by the air compressor is about 50°C, and the outside temperature is usually about 30°C. In the above technical scheme, the compressed air compressed by the air compressor is first stored in the air storage tank, and the air storage tank has a natural cooling process. Then, the air storage tank is connected to the first refrigerated air dryer for connection drying and refrigeration, which greatly reduces energy consumption and improves economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0040] Figure 1 A schematic diagram of an anti-frosting system provided in Example 1 of the present invention.

[0041] Figure 2 A schematic diagram of an anti-frosting system provided in Embodiment 2 of the present invention.

[0042] Figure 3 A schematic diagram of an anti-frosting system provided in Embodiment 3 of the present invention.

[0043] Figure 4 This is a schematic diagram of an anti-frost system provided in Embodiment 5 of the present invention.

[0044] Figure 5 A schematic diagram of an anti-frost system provided in Example 6 of the present invention.

[0045] Figure 6 A schematic diagram of an anti-frost system provided in Embodiment 7 of the present invention.

[0046] Figure 7 A schematic diagram of an anti-frost system provided in Embodiment 8 of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Embodiment 1

[0049] like Figure 1 As shown, an anti-frost system includes a control system, an air compressor, an air storage tank, a first refrigerated air dryer, a first control valve, a differential pressure sensor and a cold storage, wherein the control system is connected to the air compressor, the air compressor is connected to the air storage tank, the air storage tank is connected to the first refrigerated air dryer, the cold storage is connected to the differential pressure sensor, the differential pressure sensor is connected to the control system, the control system is connected to the first control valve, the first control valve is connected to the first refrigerated air dryer, and the first control valve is connected to the cold storage;

[0050] The air storage tank is used to store compressed air compressed by the air compressor;

[0051] The first refrigerated air dryer is used to cool and dry the compressed air in the air storage tank to ensure that the compressed air entering the cold storage is dry to avoid bringing water vapor into the cold storage;

[0052] The differential pressure sensor is used to detect the internal pressure of the cold storage and the external pressure of the cold storage;

[0053] The control system is used to calculate the pressure difference according to the current internal pressure and external pressure of the cold storage, set the current internal pressure of the cold storage to P1, set the current external pressure of the cold storage to P2, and set the pressure difference to ΔP, wherein ΔP = (P1-P2); when the pressure difference ΔP reaches a first set value, it should be noted that the first set value is a preset value, when the pressure difference between the inside and outside of the cold storage reaches the preset first set value, the control system generates a first instruction, and sends a first instruction to the first control valve to open the first control valve, at which time the low-temperature dry air passing through the first refrigerated air dryer is supplemented into the cold storage; when the pressure difference ΔP does not When it is less than the first balance value, the control system generates a second instruction and sends a second instruction to the first control valve to close the first control valve. It should be noted that the first balance value is a preset value, which can be 0 or greater than 0. When the first balance value is 0, the pressure difference ΔP is not less than the first balance value. In this condition, the pressure difference ΔP inside and outside the cold storage is 0 to maintain balance or the internal pressure of the cold storage is greater than the external pressure. When the first balance value is greater than 0, the pressure difference ΔP is not less than the first balance value. In this condition, the pressure difference ΔP inside and outside the cold storage is greater than 0, that is, the internal pressure of the cold storage is kept greater than the external pressure.

[0054] The first control valve is used to receive the first instruction and the second instruction sent by the control system; the first control valve is selectively opened according to the first instruction and the second instruction, and the low-temperature dry air passing through the first refrigerated air dryer is transmitted to the inside of the cold storage, so that the pressure inside the cold storage is greater than the pressure outside the cold storage or the pressure inside and outside the cold storage is balanced, thereby destroying the conditions for the cold and heat exchange between the inside and outside of the cold storage. It should be noted that the first control valve is selectively opened, which means that when the first control valve receives the first instruction sent by the control system, the first control valve is opened, and the low-temperature dry air passing through the first refrigerated air dryer is transmitted to the inside of the cold storage, and when the first control valve receives the second instruction sent by the control system, the first control valve is closed.

[0055] Usually, the temperature of air compressed by an air compressor is around 50°C, and the outside temperature is usually around 30°C. In the above technical solution, the compressed air compressed by the air compressor is first stored in an air tank, and the air tank undergoes a natural cooling process. Then, the air tank is connected to the first refrigerated air dryer for drying and refrigeration. The air tank is first cooled naturally, and then dried and refrigerated, which greatly reduces energy consumption and improves economy.

[0056] Embodiment 2

[0057] like Figure 2As shown, at least one oil mist separator is connected between the air compressor and the air storage tank, which is used to remove and purify the oil mist of the compressed air compressed by the air compressor before it enters the air storage tank for storage. After the oil mist is collected, what is discharged is relatively clean compressed air, thereby purifying the compressed air.

[0058] like Figure 2 As shown, at least one filter device is connected between the first control valve and the first refrigerated air dryer. The compressed air in the gas storage tank is filtered through the filter device to remove impurities in the compressed air to ensure that the compressed air entering the cold storage is clean. The filter device can be multiple groups, which filter particles of different sizes to obtain the required clean gas. When the control system sends a first instruction to the first control valve and opens the first control valve, the compressed air in the gas storage tank is cooled and dried by the first refrigerated air dryer, and then filtered by the filter device to remove impurities and then transported to the cold storage.

[0059] Embodiment 3

[0060] like Figure 3 As shown, it also includes a first pressure sensor, the control system is connected to the first pressure sensor, and the first pressure sensor is connected to the gas storage tank;

[0061] The first pressure sensor is used to monitor the pressure of the gas storage tank and feed back to the control system, and the control system receives the current pressure value of the gas storage tank;

[0062] When the current pressure value of the air storage tank reaches the second set value, the control system generates a third instruction, and sends the third instruction to the air compressor to turn on the air compressor to replenish the compressed air to the air storage tank, that is, the air compressor delivers compressed air to the air storage tank to replenish the compressed air in the air storage tank;

[0063] It should be noted that the second set value is a pre-set value. When the current pressure value of the air tank reaches the second set value, it indicates that the compressed air in the air tank is not sufficient and needs to be replenished. The control system generates a third instruction and sends the third instruction to the air compressor to turn on the air compressor to replenish the compressed air to the air tank.

[0064] When the current pressure value of the air storage tank reaches a third set value, the control system generates a fourth instruction and sends the fourth instruction to the air compressor to shut down the air compressor.

[0065] It should be noted that the third set value is a pre-set value. When the current pressure value of the air tank reaches the third set value, it indicates that the compressed air in the air tank is sufficient. The control system generates a fourth instruction and sends the fourth instruction to the air compressor to shut down the air compressor and stop replenishing compressed air to the air tank.

[0066] The above technical solution monitors the pressure in the gas tank in real time through the first pressure sensor. When it is detected that the pressure in the gas tank is insufficient, timely feedback is given to the control system, and the control system sends a command to the air compressor to turn on the air compressor to replenish compressed air to the gas tank, so as to ensure that the compressed air in the gas tank can always be kept sufficient, and to ensure that when cold air needs to be transported to the cold storage, the compressed air in the gas tank can fully supply the cold air transportation demand.

[0067] Embodiment 4

[0068] This embodiment is not shown in the figure. The cold storage comprises a storage body, on which a hatch and an inspection door are arranged, the hatch is used for the entry and exit of refrigerated goods, and the inspection door is used for entering the cold storage by opening the inspection door when manual entry into the cold storage is required for maintenance, the hatch is connected to a first sensing device, the inspection door is connected to a second sensing device, and the first sensing device and the second sensing device are connected to a control system;

[0069] The first sensing device is used to sense the opening and closing of the door, and feed back the opening and closing signals of the door to the control system;

[0070] The second sensing device is used to sense the opening and closing of the inspection door, and feed back the opening and closing signals of the inspection door to the control system;

[0071] The control system is used to receive signals fed back by the first sensing device and the second sensing device, and the control system selectively controls the opening and closing of the first control valve according to the received signals.

[0072] When the control system receives a signal from the first sensing device or the second sensing device that the hatch or inspection door is open, the control system generates a fifth instruction and sends the fifth instruction to the first control valve to open the first control valve. At this time, the low-temperature dry air passing through the first refrigerated air dryer is replenished into the cold storage; when the control system receives a signal from the first sensing device or the second sensing device that the hatch or inspection door is closed, and the control system calculates that the pressure difference is not less than the first balance value based on the current internal pressure and external pressure of the cold storage, the control system generates a sixth instruction and sends the sixth instruction to the first control valve to close the first control valve.

[0073] The opening and closing states of the hatch and the inspection door are sensed by the first sensing device and the second sensing device respectively. When the first sensing device and the second sensing device sense that the hatch or the inspection door is in the open state, the signal of the opening state of the hatch or the inspection door is fed back to the control system, and the control system controls the first control valve to open, and transmits the low-temperature dry air passing through the first refrigerated air dryer to the cold storage, so that the pressure inside the cold storage is greater than the pressure outside the cold storage or the pressure inside and outside the cold storage is balanced. The main technical problems solved and the technical effects achieved are as follows:

[0074] Refrigerated items enter and exit the cold storage through the hatch of the cold storage. Since the temperature inside the cold storage is low and the air pressure is lower than the external environment, when the hatch is opened, the pressure difference between the inside and the outside will cause external air to enter the cold storage, causing the moisture in the air to freeze at the hatch when it encounters cold, affecting the opening and closing of the hatch, and the hatch cannot be opened or sealed normally, affecting the normal use of the cold storage, the normal operation of the hatch, and the user experience.

[0075] In order to facilitate the inspection and maintenance inside the cold storage, an inspection door is set on the cold storage. When manual entry is required for maintenance, the inspection door is opened to enter the cold storage. When the inspection door is opened, the pressure difference between the inside and the outside will cause the outside air to enter the cold storage, causing the outside air to condense at the inspection door when it encounters cold, resulting in ice. Over time, it will make it difficult to open the inspection door, affecting the normal use of the inspection door.

[0076] When the hatch and inspection door are opened, outside air enters the cold storage, and water vapor freezes when it is cooled, affecting the normal use of the hatch and inspection door, making maintenance inconvenient, costly, and resulting in a poor user experience.

[0077] Therefore, the technical solution senses the opening and closing states of the hatch and the inspection door respectively through the first sensing device and the second sensing device. When the first sensing device and the second sensing device sense that the hatch or the inspection door is in the open state, the signal of the opening state of the hatch or the inspection door is fed back to the control system, and the first control valve is controlled to open by the control system to transmit the low-temperature dry air passing through the first refrigerated air dryer to the cold storage, and automatically replenish the compressed air after low-temperature drying into the cold storage, so as to increase the pressure inside the storage to be greater than the external pressure of the cold storage or to keep the internal and external pressures of the cold storage balanced, thereby preventing the heat exchange between the inside and outside of the cold storage due to the opening of the hatch or the inspection door, and preventing the external hot air from entering the cold storage, thereby avoiding ice or frost inside the cold storage, the hatch, the inspection door and other connecting parts inside and outside the storage.

[0078] Embodiment 5

[0079] like Figure 4As shown, in this embodiment, a spare gas cylinder and a second control valve are further included, the spare gas cylinder and the second control valve are arranged inside the cold storage, the spare gas cylinder is connected to the second control valve, and the second control valve is connected to the control system; the spare gas cylinder and the second control valve can be provided in multiple numbers as needed, all of which fall within the protection scope of the present invention;

[0080] The spare gas cylinder is used to store low-temperature dry compressed air;

[0081] The control system selectively sends a seventh instruction to the second control valve to open the second control valve according to whether the first control valve responds to the first instruction and the difference between the pressure difference between the internal pressure and the external pressure of the cold storage for a set time after the first control valve is opened and the first equilibrium value, and the second control valve is opened. At this time, the low-temperature dry compressed air in the spare gas cylinder is replenished into the cold storage. Specifically, there are the following situations:

[0082] When the control system sends the first instruction to the first control valve and the first control valve does not respond, the control system sends the seventh instruction to the second control valve to open the second control valve, and uses the low-temperature and dry compressed air in the spare gas cylinder to replenish the cold storage in time. The control system is used to calculate the pressure difference according to the current internal pressure and external pressure of the cold storage. When the pressure difference reaches not less than the first equilibrium value, the control system generates the eighth instruction and sends the eighth instruction to the second control valve to close the second control valve.

[0083] When the first pressure sensor fails to monitor the pressure of the air tank, the compressed air cannot be replenished in the air tank in time, even if the first control valve is opened and continuously replenishes low-temperature and dry compressed air into the cold storage, when the set time length is reached, the pressure difference calculated by the control system based on the internal pressure and external pressure detected by the differential pressure sensor still fails to reach the first equilibrium value, that is, when the set time length is reached, the pressure difference between the inside and outside of the cold storage is still less than the first equilibrium value, and the control system sends the seventh instruction to the second control valve to open the second control valve, and use the low-temperature and dry compressed air in the spare gas cylinder to replenish the cold storage in time. The control system calculates the pressure difference based on the current internal pressure and external pressure of the cold storage. When the pressure difference reaches no less than the first equilibrium value, the control system generates the eighth instruction, and sends the eighth instruction to the second control valve to close the second control valve.

[0084] The following describes the pressure difference between the internal pressure and the external pressure of the cold storage at a set time length after the first control valve is opened. In this embodiment, the set time length is 20s. When the control system calculates the pressure difference based on the current internal pressure and external pressure of the cold storage and reaches the first set value, the control system generates a first instruction and sends a first instruction to the first control valve to open the first control valve to continuously replenish the low-temperature dry air passing through the first refrigerated air dryer into the cold storage. When the duration reaches 20s, the pressure difference between the inside and outside of the cold storage calculated by the control system based on the internal pressure and external pressure detected by the differential pressure sensor is still less than the first equilibrium value. It should be noted that the pressure difference between the inside and outside of the cold storage refers to the difference between the internal pressure of the cold storage and the external pressure, and the difference between the pressure difference between the inside and outside of the cold storage and the first equilibrium value refers to the difference between the pressure difference between the inside and outside of the cold storage and the first equilibrium value. When the difference between the pressure difference between the inside and outside of the cold storage and the first equilibrium value is less than 0 (according to the aforementioned embodiment, the first equilibrium value can be either 0 or greater than 0 value), that is, the pressure difference between the inside and outside of the cold storage is less than the first equilibrium value. For example, when the first pressure sensor fails to monitor the pressure of the gas tank, the compressed air is not replenished in time in the gas tank, that is, the compressed air in the gas tank is insufficient, and continuous transmission for 20 seconds is not enough to make up for the pressure difference between the inside and outside of the cold storage, that is, after the first refrigerated dryer continuously transmits low-temperature dry air for 20 seconds, the pressure difference between the inside and outside of the cold storage is still less than the first equilibrium value. At this time, in this case, the control system sends the seventh instruction to the second control valve to open the second control valve, and use the low-temperature dry compressed air in the spare gas cylinder to replenish the inside of the cold storage in time, so as to timely promote the pressure inside the cold storage to be greater than the pressure outside the cold storage or to balance the pressure inside and outside the cold storage, thereby destroying the conditions for exchanging heat between the inside and outside of the cold storage. When the pressure difference between the inside and outside of the cold storage reaches not less than the first equilibrium value, that is, when the pressure difference between the inside and outside of the cold storage is greater than or equal to the first equilibrium value, the control system generates the eighth instruction, and sends the eighth instruction to the second control valve to close the second control valve.

[0085] Embodiment 6

[0086] like Figure 5 As shown, in this embodiment, it also includes a terminal display, which is connected to the control system, and the spare gas cylinder is also connected to a second pressure sensor, which is connected to the control system, and the second pressure sensor is used to monitor the pressure of the spare gas cylinder and feed back to the control system, and the control system receives the current pressure value of the spare gas cylinder; when the current pressure value of the spare gas cylinder reaches a fourth set value, the control system generates a ninth instruction and sends the ninth instruction to the terminal display, prompting the user to replace the spare gas cylinder to ensure that there is sufficient low-temperature dry compressed air in the spare gas cylinder for backup.

[0087] It should be noted that the fourth set value is a pre-set value. When the pressure value of the spare gas cylinder monitored by the second pressure sensor reaches the fourth set value, it indicates that the low-temperature dry compressed air in the spare gas cylinder is insufficient and the gas cylinder needs to be replaced.

[0088] Embodiment 7

[0089] like Figure 6 As shown, in this embodiment, it also includes an auxiliary air storage tank, a second refrigerated air dryer and a third control valve, the air compressor is connected to the auxiliary air storage tank, the auxiliary air storage tank is connected to the second refrigerated air dryer, the second refrigerated air dryer is connected to the third control valve, the control system is connected to the third control valve, and the third control valve is connected to the cold storage;

[0090] The control system calculates the pressure difference according to the current internal pressure and external pressure of the cold storage. When the pressure difference reaches a first set value, the control system generates a first instruction and sends the first instruction to the first control valve to open the first control valve. The control system generates a tenth instruction and sends the tenth instruction to the third control valve to open the third control valve.

[0091] Through this technical solution, when it is necessary to supplement the cold storage with low-temperature dry compressed air, the low-temperature dry compressed air dried by the first refrigerated air dryer and the second refrigerated air dryer is simultaneously supplemented into the cold storage, and the two simultaneous air intake supplements are used to quickly promote the pressure inside the cold storage to be greater than the pressure outside the cold storage or the internal and external pressures of the cold storage to maintain a balanced state, which greatly shortens the time for the pressure inside the cold storage to be greater than the external pressure of the cold storage or the internal and external pressures of the cold storage to reach a balance, and avoids the possible ice or frost problem inside the cold storage caused by the long transmission time of low-temperature dry compressed air. In other words, the control system calculates the pressure difference according to the current internal pressure and external pressure of the cold storage. When the pressure difference reaches the first set value, it is necessary to supplement the cold storage with low-temperature dry compressed air. The refrigerated air dryer supplements the low-temperature dry compressed air into the cold storage, so that the pressure inside the cold storage is greater than the external pressure of the cold storage or the internal and external pressures of the cold storage are balanced, and the refrigerated air dryer supplements the low-temperature dry compressed air into the cold storage. It takes a certain amount of time to charge the low-temperature dry compressed air to make the pressure inside the cold storage greater than the pressure outside the cold storage or the state in which the pressure inside and outside the cold storage are balanced. Before the above state is reached, the pressure inside the cold storage is still lower than the pressure outside the cold storage. Therefore, before the above state is reached, there is still the problem that the hot air outside the cold storage enters the cold storage and causes ice or frost inside the cold storage. Therefore, in this technical solution, through the auxiliary air storage tank, the second refrigerated air dryer and the third control valve, that is, there are two refrigerated air dryers, the low-temperature dry compressed air dried by the first refrigerated air dryer and the second refrigerated air dryer is simultaneously supplemented to the inside of the cold storage, and through the two simultaneous air intake supplements, "two-pronged approach" is used to quickly promote the realization of the state condition that the pressure inside the cold storage is greater than the pressure outside the cold storage or the pressure inside and outside the cold storage are balanced, greatly shortening the time to reach the pressure inside the cold storage greater than the pressure outside the cold storage or the time to reach the balance between the pressure inside and outside the cold storage, and greatly reducing the possibility of ice or frost inside the cold storage.

[0092] When the pressure difference is not less than the first balance value, the control system generates a second instruction and sends the second instruction to the first control valve to close the first control valve. The control system generates an eleventh instruction and sends the eleventh instruction to the third control valve to close the third control valve.

[0093] Embodiment 8

[0094] like Figure 7 As shown, in this embodiment, a third pressure sensor is further included, the control system is connected to the third pressure sensor, and the third pressure sensor is connected to the auxiliary gas storage tank;

[0095] The third pressure sensor is used to monitor the pressure of the auxiliary gas storage tank and feed back to the control system, and the control system receives the current pressure value of the auxiliary gas storage tank;

[0096] When the current pressure value of the auxiliary air storage tank reaches the second set value, the control system generates a twelfth instruction, and sends the twelfth instruction to the air compressor to turn on the air compressor to replenish the auxiliary air storage tank with compressed air, that is, the air compressor delivers compressed air to the auxiliary air storage tank to replenish the compressed air in the auxiliary air storage tank;

[0097] When the current pressure value of the auxiliary air storage tank reaches a third set value, the control system generates a thirteenth instruction, and sends the thirteenth instruction to the air compressor to shut down the air compressor.

[0098] It should be noted that, in order to simplify the logical control of the control system, the second set value and the third set value described in this embodiment are the same as the second set value and the third set value described in the above-mentioned embodiment 3.

[0099] In this technical solution, the pressure in the auxiliary air tank is monitored in real time by a third pressure sensor to ensure that the compressed air in the auxiliary air tank is always sufficient, and to ensure that when cold air needs to be transported to the cold storage, the compressed air in the auxiliary air tank can fully assist in supplying the cold air delivery demand.

[0100] The applicant declares that the above-described embodiments only express the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-described embodiments, and the above-described embodiments and the specification only describe the principles of the present invention. For those skilled in the art, various changes and improvements can be made without departing from the concept and scope of the present invention, and these changes and improvements all fall within the scope of the present invention to be protected.

[0101] The present invention is not limited to the above-mentioned embodiments, and all embodiments that use structures and methods similar to the present invention to achieve the purpose of the present invention are within the protection scope of the present invention.

Claims

1. An anti-frost system, characterized in that: It includes a control system, an air compressor, an air storage tank, a first refrigerated air dryer, a first control valve, a differential pressure sensor and a cold storage, wherein the control system is connected to the air compressor, the air compressor is connected to the air storage tank, the air storage tank is connected to the first refrigerated air dryer, the cold storage is connected to the differential pressure sensor, the differential pressure sensor is connected to the control system, the control system is connected to the first control valve, the first control valve is connected to the first refrigerated air dryer, and the first control valve is connected to the cold storage; The air storage tank is used to store compressed air compressed by the air compressor; The first refrigerated air dryer is used to cool and dry the compressed air in the air storage tank; The differential pressure sensor is used to detect the internal pressure of the cold storage and the external pressure of the cold storage; The control system is used to calculate the pressure difference according to the current internal pressure and external pressure of the cold storage; when the pressure difference reaches a first set value, the control system generates a first instruction, and sends the first instruction to the first control valve to open the first control valve; when the pressure difference is not less than a first balance value, the control system generates a second instruction, and sends the second instruction to the first control valve to close the first control valve; The first control valve is used to receive a first instruction and a second instruction sent by the control system; the first control valve is selectively opened according to the first instruction and the second instruction; It also includes at least one spare gas cylinder and a second control valve matching the number of spare gas cylinders, the spare gas cylinder and the second control valve are arranged inside the cold storage, the spare gas cylinder is connected to the second control valve, and the second control valve is connected to the control system; The spare gas cylinder is used to store low-temperature dry compressed air; The control system selectively sends a seventh instruction to the second control valve to open the second control valve based on whether the first control valve responds to the first instruction and the difference between the pressure difference between the internal pressure and the external pressure of the cold storage at a set time length after the first control valve is opened and the first equilibrium value.

2. An anti-frost system according to claim 1, characterized in that: At least one oil mist separator is also connected between the air compressor and the air storage tank.

3. An anti-frost system according to claim 2, characterized in that: At least one filter device is also connected between the first control valve and the first refrigerated air dryer.

4. An anti-frost system according to any one of claims 1 to 3, characterized in that: It also includes a first pressure sensor, the control system is connected to the first pressure sensor, and the first pressure sensor is connected to the gas storage tank; The first pressure sensor is used to monitor the pressure of the gas storage tank and feed back to the control system, and the control system receives the current pressure value of the gas storage tank; When the current pressure value of the air storage tank reaches a second set value, the control system generates a third instruction, and sends the third instruction to the air compressor to turn on the air compressor; When the current pressure value of the air storage tank reaches a third set value, the control system generates a fourth instruction and sends the fourth instruction to the air compressor to shut down the air compressor.

5. The anti-frost system according to claim 1, characterized in that: The cold storage comprises a storage body, a hatch and an inspection door are arranged on the storage body, a first sensing device is connected to the hatch, a second sensing device is connected to the inspection door, and the first sensing device and the second sensing device are connected to a control system; The first sensing device is used to sense the opening and closing of the door, and feed back the opening and closing signals of the door to the control system; The second sensing device is used to sense the opening and closing of the inspection door, and feed back the opening and closing signals of the inspection door to the control system; The control system is used to receive signals fed back by the first sensing device and the second sensing device, and the control system selectively controls the opening and closing of the first control valve according to the received signals.

6. An anti-frost system according to claim 5, characterized in that: When the control system receives a signal from the first sensing device or the second sensing device that the hatch or inspection door is open, the control system generates a fifth instruction and sends the fifth instruction to the first control valve to open the first control valve; when the control system receives a signal from the first sensing device or the second sensing device that the hatch or inspection door is closed, and the control system calculates that the pressure difference is not less than the first balance value based on the current internal pressure and external pressure of the cold storage, the control system generates a sixth instruction and sends the sixth instruction to the first control valve to close the first control valve.

7. The anti-frost system according to claim 1, characterized in that: It also includes a terminal display and a second pressure sensor, wherein the terminal display is connected to the control system, the backup gas cylinder is connected to the second pressure sensor, and the second pressure sensor is connected to the control system; The second pressure sensor is used to monitor the pressure of the spare gas cylinder and feed back to the control system; The control system receives the current pressure value of the spare gas cylinder; when the current pressure value of the spare gas cylinder reaches a fourth set value, the control system generates a ninth instruction and sends the ninth instruction to the terminal display, prompting the user to replace the spare gas cylinder.

8. The anti-frost system according to claim 4, characterized in that: It also includes an auxiliary air storage tank, a second refrigerated air dryer and a third control valve, the air compressor is connected to the auxiliary air storage tank, the auxiliary air storage tank is connected to the second refrigerated air dryer, the second refrigerated air dryer is connected to the third control valve, the control system is connected to the third control valve, and the third control valve is connected to the cold storage; The control system calculates the pressure difference according to the current internal pressure and external pressure of the cold storage; when the pressure difference reaches a first set value, the control system generates a tenth instruction, and sends the tenth instruction to the third control valve to open the third control valve; when the pressure difference is not less than a first balance value, the control system generates an eleventh instruction, and sends the eleventh instruction to the third control valve to close the third control valve.

9. An anti-frost system according to claim 8, characterized in that: It also includes a third pressure sensor, the control system is connected to the third pressure sensor, and the third pressure sensor is connected to the auxiliary gas storage tank; The third pressure sensor is used to monitor the pressure of the auxiliary gas storage tank and feed back to the control system; The control system receives a current pressure value of the auxiliary air storage tank; when the current pressure value of the auxiliary air storage tank reaches a second set value, the control system generates a twelfth instruction, and sends the twelfth instruction to the air compressor to turn on the air compressor; when the current pressure value of the auxiliary air storage tank reaches a third set value, the control system generates a thirteenth instruction, and sends the thirteenth instruction to the air compressor to turn off the air compressor.

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