A frost prevention control system

Abstract

The present invention discloses an anti-frost control system, comprising a cold storage, a terminal display, a controller, a differential pressure sensor, a pressure sensor group, a control valve group and at least one gas cylinder, wherein the pressure sensor group comprises at least one pressure sensor matching the number of gas cylinders, the control valve group comprises at least one control valve matching the number of gas cylinders, the pressure sensor group, the control valve group and the gas cylinders are all arranged inside the cold storage, and according to the technical scheme, the low-temperature dry gas stored in the gas cylinder is always balanced and tends to be consistent with the working temperature inside the cold storage, so that the low-temperature dry gas released by the gas cylinder will not or minimally affect the normal operation of the cold storage, in addition, the controller sends information such as the remaining available release time of the gas cylinder, the gas cylinder with abnormal control valve, and the current pressure value of the gas cylinder to the terminal display system, and alarms are performed in different ways for the abnormal status information of the gas cylinder, thereby greatly improving the intelligence, enabling users to timely identify the status of the gas cylinder and implement planned replacement or inspection of the gas cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration, in particular to an anti-frost control 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. However, there are two important problems facing automated cold storage: 1. Due to the temperature fluctuations in the cold storage, the stored items undergo a solid freezing and melting process, especially the large fluctuations in the temperature in 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; 2. In the area where the low temperature environment inside the cold storage and the relatively high temperature environment outside are combined, it is easy to exchange heat and cold, causing frost or fog 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 likely to frost or fog, making the corresponding automated device ineffective. In the prior art, such as in patents CN206019134U and CN106152679A, wind curtains are used at the cold storage door to block the outside air from entering the cold storage. However, the design of the wind curtain will allow some air to bring in water vapor when entering the cold storage, and the water vapor will freeze when it is cold. There is still a lot of room for improvement in the adjustment method, control method and intelligent control system. Summary of the invention

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

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

[0006] A frost prevention control system comprises a cold storage, a terminal display, a controller, a differential pressure sensor, a pressure sensor group, a control valve group and at least one gas cylinder, wherein the pressure sensor group comprises at least one pressure sensor matching the number of gas cylinders, the control valve group comprises at least one control valve matching the number of gas cylinders, the pressure sensor group, the control valve group and the gas cylinders are all arranged inside the cold storage, the gas cylinder is connected to the control valve, the control valve is connected to the controller, the gas cylinder is connected to the pressure sensor, the pressure sensor is connected to the controller, the cold storage is connected to the differential pressure sensor, the differential pressure sensor is connected to the controller, and the terminal display is connected to the controller, wherein:

[0007] The gas cylinder is used to store low-temperature dry gas, which may be low-temperature dry compressed air or inert gas, etc.;

[0008] The differential pressure sensor is used to detect the internal pressure of the cold storage and the external pressure of the cold storage;

[0009] The controller 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 controller generates a first instruction, and sends the first instruction to the control valve to open the control valve, at which time the low-temperature dry air or inert gas stored in the gas cylinder is replenished into the cold storage; when the pressure difference is not less than the first balance value, the controller generates a second instruction, and sends the second instruction to the control valve to close the control valve;

[0010] The control valve is used to receive the first instruction and the second instruction sent by the controller; according to the first instruction and the second instruction, the control valve is selectively opened so that the low-temperature dry air or inert gas stored in the gas cylinder 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 pressure inside and outside the cold storage is balanced, thereby destroying the conditions for heat exchange inside and outside the cold storage. It should be noted that the selective opening of the control valve means that the control valve is opened when it receives the first instruction and is closed when it receives the second instruction.

[0011] The pressure sensor is used to monitor the pressure of the gas cylinder and feed back to the controller, and the controller receives the current pressure value of the gas cylinder; when the current pressure value of the gas cylinder reaches a second set value, the controller generates a third instruction, and sends the third instruction to the terminal display, prompting the user to replace the gas cylinder in time to ensure that there is sufficient gas in the gas cylinder for backup, and ensure that sufficient gas can be replenished in time for the cold storage to meet the corresponding pressure requirements.

[0012] In the above technical solution, the gas cylinder is placed inside the cold storage and its temperature tends to be consistent with that inside the cold storage. Therefore, the compressed gas released by it will not affect the normal operation of the cold storage or will affect it to the minimum extent.

[0013] In the above technical solution, the gas stored in the gas cylinder can be low-temperature dry compressed air or inert gas. Since the inert gas is extremely stable and does not contain any impurities, when it is added to the cold storage and flows inside the cold storage, it can minimize the impact on the quality of the refrigerated items inside the cold storage.

[0014] Further, the number of gas cylinders is N, where N is a positive integer greater than 1, the N gas cylinders are set to be the 1st gas cylinder to the Nth gas cylinder, the pressure sensor group is set to include the 1st pressure sensor to the Nth pressure sensor connected to the N gas cylinders, and the control valve group is set to include the 1st control valve to the Nth control valve connected to the N gas cylinders;

[0015] The first pressure sensor to the Nth pressure sensor are used to monitor the pressure of the first gas cylinder to the Nth gas cylinder respectively and feed back to the control system, and the control system receives the current pressure values ​​of the first gas cylinder to the Nth gas cylinder;

[0016] The control system arranges the received current pressure values ​​of the N gas cylinders in a set form, and the set form of arrangement may be an ascending order or a descending order of the pressure values;

[0017] The control system analyzes the pressure values ​​of the N gas cylinders in the current state according to the arrangement result of the set form, and sets the N gas cylinders to the first compensation gas cylinder to the Nth compensation gas cylinder according to the pressure values ​​of the N gas cylinders, wherein the gas cylinder with the largest pressure value in the current state is the first compensation gas cylinder, the gas cylinder with the smallest pressure value in the current state is the Nth compensation gas cylinder, the first compensation gas cylinder is set as the priority compensation gas cylinder, the control valve connected to the first compensation gas cylinder is set as the priority control valve, and the pressure sensor connected to the first compensation gas cylinder is set as the priority pressure sensor;

[0018] When the pressure difference reaches a first set value, the controller generates a first instruction and sends the first instruction to the priority control valve to open the priority control valve so that the low-temperature dry air or inert gas stored in the priority compensation gas cylinder is transmitted to the interior of the cold storage;

[0019] It should be noted that the setting format mentioned here refers to a pre-set arrangement format, which can be ascending order, descending order, etc.

[0020] Further, when the controller receives information that the current pressure value of the priority compensation gas cylinder reaches a second set value, the controller arranges the received current pressure values ​​of the N gas cylinders in a set form and resets the priority compensation gas cylinder in the current state.

[0021] It should be noted that, in this technical solution, when the controller receives that the current pressure value of the priority compensation gas cylinder reaches the second set value, the controller generates a third instruction, and sends the third instruction to the terminal display, prompting the user that the gas cylinder is running low and needs to be replaced, indicating that the priority compensation gas cylinder can no longer be used to replenish and deliver gas to the cold storage. In this state, the controller once again re-arranges the current pressure values ​​of the N gas cylinders received in the current state in a reset format (the meaning of the setting format is the same as the above explanation and will not be repeated here), and resets the priority compensation gas cylinder in the current state. The reset setting of the priority compensation gas cylinder in the current state means It means that, after the gas cylinder with the largest pressure value is rearranged, the triggering timing of the controller for the setting arrangement of each N gas cylinder can be understood to include the following timings: First, when the current pressure value of the priority compensation gas cylinder received by the controller reaches the second set value, the controller rearranges the gas cylinder in a set form according to the current pressure values ​​of the N gas cylinders received, and resets the priority compensation gas cylinder in the current state; Second, when the user replaces the gas cylinder with insufficient gas volume according to the prompt of the terminal display, the controller arranges the gas cylinder in a set form according to the current pressure values ​​of the N gas cylinders received, and resets the priority compensation gas cylinder in the current state.

[0022] Further, the controller is used to store the total available release time and the remaining available release time of N gas cylinders;

[0023] Set the total available release time to T 0 , the remaining available release time is T t , the initial pressure of the gas cylinder is P 0 , the current pressure value of the gas cylinder is P t ;

[0024] The controller is based on the total available release time T 0 , the initial pressure value of the gas cylinder is P 0 、The current pressure value of the gas cylinder is P t The remaining available release time is calculated to be T t ;

[0025] The controller sends the total available release time and the remaining available release time to the terminal display;

[0026] The total available release time is a preset value, which is usually set by the design and development personnel after comprehensively considering factors such as the gas volume contained in the gas cylinder, the gas density, the initial pressure value of the gas cylinder (that is, the pressure value monitored by the pressure sensor and fed back to the controller after the gas cylinder is filled with gas) and the gas release speed after the control valve is opened. In addition, in this technical solution, the controller sets the total available release time as T 0 , the initial pressure value of the gas cylinder is P 0 、The current pressure value of the gas cylinder is P t The remaining available release time is calculated to be T t The method can be a ratio method. For example, the total available release time after comprehensively considering the error factor is T 0 The initial pressure of the gas cylinder is P 0 The ratio will be equal to the remaining available release time T after comprehensively considering the error factors. t The current pressure of the gas cylinder is P t The ratio method can be expressed as (T 0 +δ) / P 0 =(T t +δ) / P t , where δ is the error factor after comprehensive consideration of error factors, is a preset value, and the total available release time T 0 is a known parameter value set in advance, and the initial pressure value of the gas cylinder is P 0 and the current pressure value P of the gas cylinder t The pressure sensor can be used to monitor the remaining available release time in real time and provide feedback to the control system. t .

[0027] In this technical solution, the control system calculates and stores the remaining available release time and sends it to the terminal display, so that the user can intuitively see the remaining available release time of each of the N gas cylinders through the terminal display, so that the user can have time and plan in advance to identify the gas cylinders that need to be replaced, to prevent the gas cylinders from being exhausted when the equipment is unattended (especially when the equipment is intermittently on duty during the day or unattended at night), resulting in the inability to make up the required pressure inside the cold storage in time, causing frost or ice problems inside the cold storage (the exhaustion of gas cylinders mentioned here is understood as the corresponding pressure value of the gas cylinder reaching the second set value).

[0028] Furthermore, the controller analyzes the gas cylinders with abnormal control valves according to the calculated pressure difference and the change of the remaining available release time, and sends the analysis to the terminal display, including the following contents:

[0029] When the pressure difference calculated by the controller according to the current internal pressure and external pressure of the cold storage is not less than the first balance value, the remaining available release time of at least one gas cylinder among the N gas cylinders continues to decrease and the duration reaches the first set time.

[0030] It should be noted that the gas cylinder with abnormal control valve refers to a gas cylinder with abnormal control valve, and the gas cylinder connected to the abnormal control valve is referred to as the gas cylinder with abnormal control valve.

[0031] It should be noted that, when the pressure difference calculated by the controller according to the current internal pressure and external pressure of the cold storage is not less than the first balance value, the remaining available release time of at least one of the N gas cylinders is still decreasing and the duration reaches the set time, wherein the set time is a pre-set value. This technical solution means that when the pressure difference calculated by the controller according to the current internal pressure and external pressure of the cold storage is not less than the first balance value, it means that there is no need to replenish and release gas into the cold storage at this time, and the controller controls the priority control valve of the corresponding priority compensation gas cylinder to close. However, if the terminal display shows that the remaining available release time of at least one of the N gas cylinders is still continuing to decrease, then If the pressure difference continues to decrease and the duration reaches the first set time, it means that when the pressure difference has reached the condition state of not less than the first equilibrium value, there is still a gas cylinder (set as the target gas cylinder) continuously releasing gas to the cold storage, and the duration has reached the preset first set time, the controller analyzes the gas cylinder that may have a control valve abnormality at present, and feeds back to the terminal display. The duration refers to the time from when the pressure difference calculated by the controller based on the current internal pressure and external pressure of the cold storage is not less than the first equilibrium value to when the target gas cylinder continues to release gas. When this duration reaches the first set time, the controller analyzes that the control valve connected to the target gas cylinder may be abnormal, and feeds back to the terminal display.

[0032] Furthermore, the controller analyzes the gas cylinders that may have abnormal control valves and feeds back to the terminal display, specifically, including the following contents:

[0033] The N gas cylinders are respectively provided with corresponding position sensing devices, and the position sensing devices are connected to the controller;

[0034] Each position sensing device is used to sense the position signal of each corresponding gas cylinder and feed the position signal back to the controller, and the controller receives the position signal of each gas cylinder and sends it to the terminal display;

[0035] The terminal display is used to display the status information of the gas cylinder and to alarm the gas cylinder with abnormal control valve.

[0036] Further, the terminal display is used to display the total available release time and the remaining available release time;

[0037] The controller analyzes that when the remaining available release time of the current gas cylinder reaches a third set value, the controller feeds back to the terminal display, and the terminal display alarms the gas cylinder whose remaining available release time reaches the third set value in a manner different from the terminal display alarming the gas cylinder with abnormal control valve;

[0038] In this technical solution, while the terminal display displays the total available release time and the remaining available release time, when the remaining available release time of a gas cylinder reaches a third set value, an alarm is issued on the terminal display to remind the user that the gas cylinder needs to be replaced. The technical feature of "the terminal display issues an alarm for the gas cylinder whose remaining available release time reaches the third set value in a manner different from the terminal display's alarm for the gas cylinder with an abnormal control valve" is implemented to facilitate visual operation, so that users can quickly know the cause of the alarm for the corresponding gas cylinder based on the different alarm colors, such as whether the control valve is abnormal or the gas volume is insufficient and needs to be replaced.

[0039] Further, when the current pressure value of the gas cylinder reaches the second set value, the controller generates a third instruction, and sends the third instruction to the terminal display, and the terminal display alarms in the same manner as the gas cylinder alarm when the remaining available release time reaches the third set value;

[0040] In this technical solution, when the current pressure value of the gas cylinder reaches the second set value, it means that the gas cylinder is exhausted and needs to be replaced, and the remaining available release time reaches the third set value, which also indicates that the gas cylinder needs to be replaced. Therefore, the above technical feature "the terminal display alarms in the same way as the gas cylinder alarm when the remaining available release time reaches the third set value" means that because the information fed back by both is that the corresponding gas cylinder needs to be replaced, in order to simplify the logical control, the same alarm method can be used. This technical solution is to further ensure the timeliness of the alarm when the gas cylinder is exhausted, and to prevent the user from being prompted to replace the gas cylinder in time due to feedback lag or failure of the remaining available release time of the gas cylinder.

[0041] Furthermore, each gas cylinder is connected to a heating device, and the heating device is connected to a controller;

[0042] The controller is used to store the start time and the second set time;

[0043] Set the start time to T 0 , set the second set time to T, set the current time to T 1 , when the T 1 =T 0+NT, where N is a natural number greater than 0, the controller controls the heating device to operate;

[0044] In this technical solution, the heating device is used to heat the gas cylinder, and the frost that may be generated on the gas cylinder is heated to prevent the gas cylinder from frosting. The main purpose is to solve the following situations that may cause frosting: the controller 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, the controller generates a first instruction and sends a first instruction to the control valve to open the control valve. At this time, the low-temperature dry air or inert gas stored in the gas cylinder is supplemented to the interior of the cold storage, and the gas cylinder releases the supplementary low-temperature dry air or inert gas to the interior of 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. This state requires a certain amount of time. Before the above state is reached, the pressure inside the cold storage is still lower than the external pressure of the cold storage. Therefore, before the above state is reached, there is still a problem that the hot air outside the cold storage enters the interior of the cold storage and causes ice or frost inside the cold storage. Therefore, in this technical solution, the controller "intermittently" controls the heating device to heat the gas cylinder (the intermittent means that when T is reached, the pressure inside the cold storage is greater than the external pressure of the cold storage. 1 =T 0 +NT, the controller controls the heating device to work), further preventing the gas cylinder from frosting.

[0045] Furthermore, each gas cylinder is also connected to a drainage device for discharging water generated when the gas cylinder is heated out of the cold storage. The above technical solution, through the operation of the heating device, intermittently heats the gas cylinder, heats the frost or ice on the gas cylinder, and the water generated after heating is discharged to the outside of the cold storage through the drainage device, thereby ensuring the normal operation of the gas cylinder.

[0046] In combination with the structural features of the present invention, compared with the prior art, the present invention provides an anti-frost control system, including a cold storage, a terminal display, a controller, a differential pressure sensor, a pressure sensor group, a control valve group and at least one gas cylinder, the pressure sensor group includes at least one pressure sensor matching the number of gas cylinders, the control valve group includes at least one control valve matching the number of gas cylinders, the pressure sensor group, the control valve group and the gas cylinders are all arranged inside the cold storage, the gas cylinder is connected to the control valve, the control valve is connected to the controller, the gas cylinder is connected to the pressure sensor, the pressure sensor is connected to the controller, the cold storage is connected to the differential pressure sensor , the differential pressure sensor is connected to the controller, and the terminal display is connected to the controller; in this technical solution, the low-temperature dry gas stored in the gas cylinder is always balanced and consistent with the internal working temperature of the cold storage, so that the low-temperature dry gas released by the gas cylinder will not or minimally affect the temperature of the cold storage, and will not affect the normal operation of the cold storage. In addition, the controller sends information such as the remaining available release time of the gas cylinder, the gas cylinder with abnormal control valve, and the current pressure value of the gas cylinder to the terminal display system, and distinguishes and alarms the abnormal status information of the gas cylinder, which greatly improves the intelligence, allowing users to promptly and quickly identify the status of the gas cylinder, and implement planned replacement or inspection of the gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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.

[0048] Figure 1 A schematic diagram of an anti-frost control system provided in Embodiment 1 of the present invention.

[0049] Figure 2 This is a schematic diagram of an anti-frost control system provided in Embodiment 2 of the present invention.

[0050] Figure 3 This is a schematic diagram of an anti-frost control system provided in Embodiment 9 of the present invention.

[0051] Figure 4 A schematic diagram of an anti-frost control system provided in Embodiment 10 of the present invention.

[0052] Figure 5 A schematic diagram of display content of a display interface of a terminal display provided by the present invention. DETAILED DESCRIPTION

[0053] 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.

[0054] Embodiment 1

[0055] like Figure 1 As shown, a frost prevention control system includes a cold storage, a terminal display, a controller, a differential pressure sensor, a pressure sensor group, a control valve group and at least one gas cylinder, wherein the pressure sensor group includes at least one pressure sensor matching the number of gas cylinders, the control valve group includes at least one control valve matching the number of gas cylinders, the pressure sensor group, the control valve group and the gas cylinders are all arranged inside the cold storage, the gas cylinder is connected to the control valve, the control valve is connected to the controller, the gas cylinder is connected to the pressure sensor, the pressure sensor is connected to the controller, the cold storage is connected to the differential pressure sensor, the differential pressure sensor is connected to the controller, and the terminal display is connected to the controller, wherein:

[0056] The gas cylinder is used to store low-temperature dry gas, which may be low-temperature dry compressed air or inert gas, etc.;

[0057] The differential pressure sensor is used to detect the internal pressure of the cold storage and the external pressure of the cold storage;

[0058] The controller 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 controller generates a first instruction, and sends the first instruction to the control valve to open the control valve, at which time the low-temperature dry air or inert gas stored in the gas cylinder is replenished into the cold storage; when the pressure difference is not less than the first balance value, the controller generates a second instruction, and sends the second instruction to the control valve to close the control valve;

[0059] The control valve is used to receive the first instruction and the second instruction sent by the controller; according to the first instruction and the second instruction, the control valve is selectively opened so that the low-temperature dry air or inert gas stored in the gas cylinder can be transmitted to the interior 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 heat exchange inside and outside the cold storage.

[0060] The pressure sensor is used to monitor the pressure of the gas cylinder and feed back to the controller, and the controller receives the current pressure value of the gas cylinder; when the current pressure value of the gas cylinder reaches a second set value, the controller generates a third instruction, and sends the third instruction to the terminal display, prompting the user to replace the gas cylinder in time to ensure that there is sufficient gas in the gas cylinder for backup, and ensure that sufficient gas can be replenished in time for the cold storage to meet the corresponding pressure requirements.

[0061] In this technical solution, the gas cylinder is placed inside the cold storage and its temperature tends to be consistent with that inside the cold storage. Therefore, the compressed gas released by it will not affect or will minimally affect the normal operation of the cold storage. The gas stored in the gas cylinder can be low-temperature dry compressed air or inert gas. Since the inert gas is extremely stable and does not contain any impurities, when it is added to the cold storage and flows inside the cold storage, it can minimize the impact on the quality of the refrigerated items inside the cold storage.

[0062] Embodiment 2

[0063] The number of gas cylinders is N, where N is a positive integer greater than 1, the N gas cylinders are set to be the 1st gas cylinder to the Nth gas cylinder, the pressure sensor group is set to include the 1st pressure sensor to the Nth pressure sensor corresponding to the N gas cylinders, and the control valve group is set to include the 1st control valve to the Nth control valve corresponding to the N gas cylinders;

[0064] The first pressure sensor to the Nth pressure sensor are used to monitor the pressure of the first gas cylinder to the Nth gas cylinder respectively and feed back to the control system, and the control system receives the current pressure values ​​of the first gas cylinder to the Nth gas cylinder;

[0065] The control system arranges the received current pressure values ​​of the N gas cylinders in a set form, and the set form of arrangement may be an ascending order or a descending order of the pressure values;

[0066] The control system analyzes the pressure values ​​of the N gas cylinders in the current state according to the arrangement result of the set form, and sets the N gas cylinders to the first compensation gas cylinder to the Nth compensation gas cylinder according to the pressure values ​​of the N gas cylinders, wherein the gas cylinder with the largest pressure value in the current state is the first compensation gas cylinder, the gas cylinder with the smallest pressure value in the current state is the Nth compensation gas cylinder, the first compensation gas cylinder is set as the priority compensation gas cylinder, the control valve connected to the first compensation gas cylinder is set as the priority control valve, and the pressure sensor connected to the first compensation gas cylinder is set as the priority pressure sensor;

[0067] When the pressure difference reaches a first set value, the controller generates a first instruction and sends a first instruction to the priority control valve to open the priority control valve so that the low-temperature dry air or inert gas stored in the priority compensation gas cylinder is transmitted to the interior of the cold storage.

[0068] like Figure 2 As shown, in this embodiment, the number of gas cylinders is 2, namely the first gas cylinder and the second gas cylinder, the pressure sensor group includes the first pressure sensor and the second pressure sensor, and the control valve group includes the first control valve and the second control valve, wherein the first gas cylinder is connected to the first control valve, the first control valve is connected to the controller, the first gas cylinder is connected to the first pressure sensor, and the first pressure sensor is connected to the controller; the second gas cylinder is connected to the second control valve, the second control valve is connected to the controller, the second gas cylinder is connected to the second pressure sensor, and the second pressure sensor is connected to the controller.

[0069] It should be noted that the setting form mentioned in the technical solution refers to a pre-set arrangement form, which can be ascending, descending or other arrangements. In this embodiment, the control system arranges the received pressure values ​​of the first gas cylinder and the second gas cylinder in descending order. When the current pressure value of the first gas cylinder is greater than the pressure value of the second gas cylinder, the first gas cylinder is set as the first compensation gas cylinder (i.e., the priority compensation gas cylinder), and the second gas cylinder is set as the second compensation gas cylinder. When the controller calculates the pressure difference according to the current internal pressure and external pressure of the cold storage and reaches the first set value, the controller generates a first instruction and sends the first instruction to the priority control valve connected to the first gas cylinder to open the priority control valve. In this technical solution, the control system arranges the gas cylinders according to the pressure values ​​of each gas cylinder received, analyzes the gas cylinder with the largest pressure value in the current state, and sets it as the priority compensation gas cylinder. The purpose is to ensure that when it is necessary to replenish gas inside the cold storage, the gas cylinder with the most sufficient gas volume is selected for replenishment and transmission, so as to avoid the difficulty in fully and fully making up for the internal pressure of the cold storage due to insufficient gas in the gas cylinder.

[0070] Embodiment 3

[0071] In this embodiment, when the controller receives that the current pressure value of the priority compensation gas cylinder reaches a second set value, the controller arranges the set form according to the received current pressure values ​​of the N gas cylinders, and resets the priority compensation gas cylinder in the current state.

[0072] It should be noted that, in this technical solution, when the controller receives that the current pressure value of the priority compensation gas cylinder reaches the second set value, the controller generates a third instruction and sends the third instruction to the terminal display, prompting the user that the gas cylinder is running low and needs to be replaced, indicating that the priority compensation gas cylinder can no longer be used to replenish and transport gas to the cold storage. In this state, the controller once again rearranges the current pressure values ​​of the N gas cylinders received in the current state in a re-set form (the meaning of the setting form is the same as the interpretation in the above-mentioned embodiment 2, and will not be repeated here), and resets the priority compensation gas cylinder in the current state. The resetting of the priority compensation gas cylinder in the current state means the gas cylinder with the largest pressure value after the re-arrangement. For example, in the above-mentioned embodiment, the current pressure value of the first gas cylinder is initially greater than the pressure value of the second gas cylinder. After being arranged in the set form, the first gas cylinder is the first compensation gas cylinder (that is, the priority gas cylinder). compensation gas cylinder), the second gas cylinder is the second compensation gas cylinder. When the controller receives that the current pressure value of the priority compensation gas cylinder (i.e., the first gas cylinder) reaches the second set value, the controller generates a third instruction and sends the third instruction to the terminal display, prompting the user that the first gas cylinder is running low and needs to be replaced. The controller re-arranges the gas cylinders in a reset manner according to the current pressure values ​​of the two gas cylinders received in the current state. At this time, the pressure value of the second compensation gas cylinder (i.e., the second gas cylinder) is greater than that of the first gas cylinder (i.e., the first compensation gas cylinder / priority compensation gas cylinder in the historical state, that is, the priority compensation gas cylinder at the time of the first arrangement, hereinafter referred to as the historical priority compensation gas cylinder). At this time, the controller will reset the setting, set the second compensation gas cylinder as the priority compensation gas cylinder in the current state, set the second control valve connected to the second compensation gas cylinder as the priority control valve, and set the second pressure sensor connected to the second compensation gas cylinder as the priority pressure sensor.

[0073] Then, if the pressure value of the historical priority compensation gas cylinder reaches the second set value, indicating that the historical priority compensation gas cylinder can no longer supply supplementary gas to the cold storage, and the pressure difference between the inside and outside of the cold storage has not reached the condition of "not less than the first balance value", the controller generates a first instruction and sends the first instruction to the reset priority control valve to open the reset priority control valve; if the pressure value of the historical priority compensation gas cylinder reaches the second set value, the pressure difference between the inside and outside of the cold storage has reached the condition of "not less than the first balance value", the controller will not send the first instruction to the reset priority control valve to open it at the moment, but the next time when the controller calculates that the pressure difference reaches the first set value based on the current internal pressure and external pressure of the cold storage, the controller will control the reset priority control valve to open again according to the setting arrangement results of each gas cylinder.

[0074] Therefore, the triggering timing of the controller for the arrangement of each of the N gas cylinders can be understood to include the following timings:

[0075] First, in the above scheme, when the controller receives that the current pressure value of the priority compensation gas cylinder reaches the second set value, the controller re-arranges the setting form according to the received current pressure values ​​of the N gas cylinders, and resets the priority compensation gas cylinder in the current state;

[0076] Second, when the user replaces the insufficient gas cylinder according to the prompt on the terminal display, it will also trigger the controller to arrange the current pressure values ​​of the N gas cylinders received in a set form and reset the priority compensation gas cylinder in the current state.

[0077] Embodiment 3

[0078] The controller is used to store the total available release time and the remaining available release time of N gas cylinders;

[0079] Set the total available release time to T 0 , the remaining available release time is T t , the initial pressure of the gas cylinder is P 0 , the current pressure value of the gas cylinder is P t ;

[0080] The controller is based on the total available release time T 0 , the initial pressure value of the gas cylinder is P 0 、The current pressure value of the gas cylinder is P t The remaining available release time is calculated to be T t ;

[0081] The controller sends the total available release time and the remaining available release time to the terminal display;

[0082] The total available release time is a preset value, which is usually set by the design and development personnel after comprehensively considering factors such as the gas volume contained in the gas cylinder, the gas density, the initial pressure value of the gas cylinder (i.e., the pressure value monitored by the pressure sensor and fed back to the controller after the gas cylinder is filled with gas), and the gas release speed after the control valve is opened. In addition, in this embodiment, the controller sets the total available release time as T 0 , the initial pressure value of the gas cylinder is P 0 、The current pressure value of the gas cylinder is P t The remaining available release time is calculated to be T t The method can be a ratio method. For example, the total available release time after comprehensively considering the error factor is T 0 The initial pressure of the gas cylinder is P 0The ratio will be equal to the remaining available release time T after comprehensively considering the error factors. t The current pressure of the gas cylinder is P t The ratio method can be expressed as (T 0 +δ) / P 0 =(T t +δ) / P t , where δ is the error factor after comprehensive consideration of error factors, is a preset value, and the total available release time T 0 is a known parameter value set in advance, and the initial pressure value of the gas cylinder is P 0 and the current pressure value P of the gas cylinder t The pressure sensor can be used to monitor the remaining available release time in real time and provide feedback to the control system. t .

[0083] In this embodiment, the control system calculates and stores the remaining available release time and sends it to the terminal display, so that the user can intuitively see the remaining available release time of each of the N gas cylinders through the terminal display, such as Figure 5 In the embodiment shown, a schematic diagram of the terminal display when the number of gas cylinders is 2 (the attached Figure 5 This is a schematic diagram for explaining the basic display content of the terminal display only. It does not represent the interface content in the actual implementation process and the actual setting position of the simulated gas cylinder legend. Figure 5 The total available release time and the remaining available release time are measured in XX hours XX minutes XX seconds, for example, the remaining available release time is 01 hours 50 minutes 35 seconds), so that users can identify the gas cylinders that need to be replaced in advance in a planned manner to prevent the gas cylinders from being exhausted when the equipment is unattended (especially when the equipment is intermittently on duty during the day or unattended at night), resulting in the inability to make up the required pressure inside the cold storage in time, causing frost or ice problems inside the cold storage (the exhaustion of the gas cylinder mentioned here is understood as the corresponding pressure value of the gas cylinder reaching the second set value).

[0084] Embodiment 5

[0085] The controller analyzes the cylinders that may have abnormal control valves according to the calculated pressure difference and the change of the remaining available release time, and sends the information to the terminal display, including the following contents:

[0086] When the pressure difference calculated by the controller according to the current internal pressure and external pressure of the cold storage is not less than the first balance value, the remaining available release time of at least one gas cylinder among the N gas cylinders continues to decrease and the duration reaches the first set time.

[0087] It should be noted that the gas cylinder with abnormal control valve refers to a gas cylinder with abnormal control valve, and the gas cylinder connected to the abnormal control valve is referred to as the gas cylinder with abnormal control valve.

[0088] It should be noted that, when the pressure difference calculated by the controller according to the current internal pressure and external pressure of the cold storage is not less than the first balance value, the remaining available release time of at least one of the N gas cylinders is still decreasing and the duration reaches the set time, wherein the set time is a pre-set value. This technical solution means that when the pressure difference calculated by the controller according to the current internal pressure and external pressure of the cold storage is not less than the first balance value, it means that there is no need to replenish and release gas into the cold storage at this time, and the controller controls the priority control valve of the corresponding priority compensation gas cylinder to close. However, if the terminal display shows that the remaining available release time of at least one of the N gas cylinders is still continuing to decrease, then If the pressure difference continues to decrease and the duration reaches the first set time, it means that when the pressure difference has reached the condition state of not less than the first equilibrium value, there is still a gas cylinder (set as the target gas cylinder) continuously releasing gas to the cold storage, and the duration has reached the preset first set time, the controller analyzes the gas cylinder that may have a control valve abnormality at present, and feeds back to the terminal display. The duration refers to the time from when the pressure difference calculated by the controller based on the current internal pressure and external pressure of the cold storage is not less than the first equilibrium value to when the target gas cylinder continues to release gas. When this duration reaches the first set time, the controller analyzes that the control valve connected to the target gas cylinder may be abnormal, and feeds back to the terminal display.

[0089] Embodiment 6

[0090] The controller analyzes the gas cylinders that may have abnormal control valves and feeds back to the terminal display. Specifically, the method includes the following contents:

[0091] The N gas cylinders are respectively provided with corresponding position sensing devices, and the position sensing devices are connected to the controller;

[0092] Each position sensing device is used to sense the position signal of each corresponding gas cylinder and feed the position signal back to the controller, and the controller receives the position signal of each gas cylinder and sends it to the terminal display;

[0093] The terminal display is used to display the status information of the gas cylinder and to alarm the gas cylinder with abnormal control valve;

[0094] like Figure 4In the embodiment shown, the number of gas cylinders is 2, namely the first gas cylinder and the second gas cylinder. The first position sensing device and the second position sensing device are respectively provided on the first gas cylinder and the second gas cylinder. The first position sensing device senses that the first gas cylinder is in the first position, and the second position sensing device senses that the second gas cylinder is in the second position. The position signal refers to the signal information that the first gas cylinder corresponds to the first position and the second gas cylinder corresponds to the second position. The first position sensing device and the second position sensing device feed back the signal information to the controller, and the controller converts the signal information into corresponding instructions and sends them to the terminal display for display. The terminal display can be displayed by means of a simulated gas cylinder marked with the position information of the gas cylinder. When the target gas cylinder that may have a control valve abnormality is received according to the analysis of the controller, the simulated gas cylinder corresponding to the corresponding target gas cylinder displayed on the terminal display will turn red or other eye-catching colors to alarm. For example, if the first gas cylinder is the target gas cylinder with an abnormal control valve, the simulated gas cylinder corresponding to it displayed on the terminal display will turn red or other eye-catching colors to alarm. The alarm method is not limited to warning through different colors. Other methods that can be used to distinguish normal gas cylinders from abnormal target gas cylinders all fall within the protection scope of the present invention.

[0095] Embodiment 7

[0096] The terminal display is used to display the total available release time and the remaining available release time;

[0097] The controller analyzes that when the remaining available release time of the current gas cylinder reaches a third set value, the controller feeds back to the terminal display, and the terminal display alarms the gas cylinder whose remaining available release time reaches the third set value in a manner different from the terminal display alarming the gas cylinder with abnormal control valve;

[0098] In this embodiment, when the remaining available release time of a gas cylinder reaches a third set value while the terminal display displays the total available release time, an alarm is issued on the terminal display to remind the user that the gas cylinder needs to be replaced. The technical feature of "the terminal display issues an alarm for the gas cylinder whose remaining available release time reaches the third set value in a manner different from the terminal display's alarm for the gas cylinder with an abnormal control valve" means that when the controller receives the result of analysis that the current first gas cylinder is the target gas cylinder with an abnormal control valve, the simulated gas cylinder corresponding to the first gas cylinder displayed on the terminal display will turn red to issue an alarm, and if the remaining available release time of the second gas cylinder reaches the third set value (that is, the second gas cylinder is exhausted and needs to be replaced), the simulated gas cylinder corresponding to the second gas cylinder displayed on the terminal display may issue an alarm in a color different from the above red, such as green. The main purpose is to facilitate visual operation so that users can quickly know whether the cause of the corresponding gas cylinder alarm is an abnormal control valve or insufficient gas volume that needs to be replaced, etc. according to the different alarm colors.

[0099] Embodiment 8

[0100] In this embodiment, when the current pressure value of the gas cylinder reaches the second set value, the controller generates a third instruction, and sends the third instruction to the terminal display, and the terminal display gives an alarm in the same manner as the alarm of the gas cylinder when the remaining available release time reaches the third set value;

[0101] In this embodiment, when the current pressure value of the gas cylinder reaches the second set value, it means that the gas cylinder is exhausted and needs to be replaced, and the remaining available release time reaches the third set value, which also indicates that the gas cylinder needs to be replaced. Therefore, the above technical feature "the terminal display alarms in the same way as the gas cylinder alarm when the remaining available release time reaches the third set value" means that because the information fed back by both is that the corresponding gas cylinder needs to be replaced, in order to simplify the logical control, the same alarm method can be used. For example, in this embodiment, when the current pressure value of the gas cylinder reaches the second set value and the remaining available release time reaches the third set value, green can be used for alarm. According to the green alarm color, the user can quickly know that the reason for the corresponding gas cylinder alarm is insufficient gas volume and needs to be replaced. This technical solution is to further ensure the timeliness of the alarm when the gas cylinder is exhausted, and the feedback lag or failure of the remaining available release time of the gas cylinder may result in the failure to prompt the user to replace it in time.

[0102] Embodiment 9

[0103] like Figure 3 As shown, in this embodiment, each gas cylinder is connected to a heating device, and the heating device is connected to a controller;

[0104] The controller is used to store the start time and the second set time;

[0105] Set the start time to T 0 , set the second set time to T, set the current time to T 1 , when the T 1 =T 0 +NT, where N is a natural number greater than 0, the controller controls the heating device to operate;

[0106] In this embodiment, the heating device is operated to heat the gas cylinder, and the frost that may be generated on the gas cylinder is heated to prevent the gas cylinder from frosting. This is mainly to solve the following situations that may cause frosting: the controller 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, the controller generates a first instruction and sends a first instruction to the control valve to open the control valve. At this time, the low-temperature dry air or inert gas stored in the gas cylinder is supplemented to the interior of the cold storage, and the gas cylinder releases the supplementary low-temperature dry air or inert gas to the interior of 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. This state requires a certain amount of time. Before the above state is reached, the pressure inside the cold storage is still lower than the external pressure of the cold storage. Therefore, before the above state is reached, there is still a problem that the hot air outside the cold storage enters the interior of the cold storage and causes ice or frost inside the cold storage. Therefore, in this technical solution, the controller "intermittently" controls the heating device to heat the gas cylinder (the intermittent means that when T is reached, the pressure inside the cold storage is greater than the external pressure of the cold storage. 1 =T 0 +NT, the controller controls the heating device to work), further preventing the gas cylinder from frosting.

[0107] Embodiment 10

[0108] like Figure 4 As shown, in this embodiment, each gas cylinder is also connected to a drainage device for discharging water generated when the gas cylinder is heated out of the cold storage. The heating device works to intermittently heat the gas cylinder to heat the frost or ice on the gas cylinder, and the water generated after heating is discharged to the outside of the cold storage through the drainage device to ensure the normal operation of the gas cylinder.

[0109] 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.

[0110] 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. A frost protection control system, characterized in that: It includes a cold storage, a terminal display, a controller, a differential pressure sensor, a pressure sensor group, a control valve group and at least one N gas cylinders, wherein N is a positive integer greater than 1, the pressure sensor group includes pressure sensors matching the number of gas cylinders, the control valve group includes control valves matching the number of gas cylinders, the pressure sensor group, the control valve group and the gas cylinders are all arranged inside the cold storage, the gas cylinder is connected to the control valve, the control valve is connected to the controller, the gas cylinder is connected to the pressure sensor, the pressure sensor is connected to the controller, the cold storage is connected to the differential pressure sensor, the differential pressure sensor is connected to the controller, the terminal display is connected to the controller, wherein: The gas cylinder is used to store low-temperature dry gas; The differential pressure sensor is used to detect the internal pressure of the cold storage and the external pressure of the cold storage; The controller 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 controller generates a first instruction and sends the first instruction to the control valve to open the control valve; when the pressure difference is not less than a first balance value, the controller generates a second instruction and sends the second instruction to the control valve to close the control valve; The control valve is used to receive a first instruction and a second instruction sent by the controller; according to the first instruction and the second instruction, the control valve is selectively opened; The pressure sensor is used to monitor the pressure of the gas cylinder and feed back to the controller, and the controller receives the current pressure value of the gas cylinder; when the current pressure value of the gas cylinder reaches a second set value, the controller generates a third instruction and sends the third instruction to the terminal display to prompt the user to replace the gas cylinder in time; The control system arranges the received N gas cylinders in a set form according to the current pressure values ​​thereof. The control system sets the gas cylinder with the largest pressure value in the current state as the priority compensation gas cylinder according to the arrangement result of the set form.

2. The anti-frost control system according to claim 1, characterized in that: The number of gas cylinders is N, where N is a positive integer greater than 1, the N gas cylinders are set to be the 1st gas cylinder to the Nth gas cylinder, the pressure sensor group is set to include the 1st pressure sensor to the Nth pressure sensor connected to the N gas cylinders, and the control valve group is set to include the 1st control valve to the Nth control valve connected to the N gas cylinders; The first pressure sensor to the Nth pressure sensor are used to monitor the pressure of the first gas cylinder to the Nth gas cylinder respectively and feed back to the control system, and the control system receives the current pressure values ​​of the first gas cylinder to the Nth gas cylinder; The control system arranges the N gas cylinders in a set form according to the received current pressure values; The control system analyzes the pressure values ​​of the N gas cylinders in the current state according to the arrangement result of the set form, and sets the N gas cylinders to the first compensation gas cylinder to the Nth compensation gas cylinder according to the pressure values ​​of the N gas cylinders, wherein the gas cylinder with the largest pressure value in the current state is the first compensation gas cylinder, the gas cylinder with the smallest pressure value in the current state is the Nth compensation gas cylinder, the first compensation gas cylinder is set as the priority compensation gas cylinder, the control valve connected to the first compensation gas cylinder is set as the priority control valve, and the pressure sensor connected to the first compensation gas cylinder is set as the priority pressure sensor; When the pressure difference reaches a first set value, the controller generates a first instruction and sends the first instruction to the priority control valve to open the priority control valve.

3. The anti-frost control system according to claim 2, characterized in that: When the controller receives information that the current pressure value of the priority compensation gas cylinder reaches a second set value, the controller arranges the received current pressure values ​​of the N gas cylinders in a set form and resets the priority compensation gas cylinder in the current state.

4. An anti-frost control system according to any one of claims 1 to 3, characterized in that: The controller is used to store the total available release time and the remaining available release time of N gas cylinders; Set the total available release time to T0 and the remaining available release time to T t , the initial pressure value of the gas cylinder is P0, and the current pressure value of the gas cylinder is P t ; Set the error factor to δ; The controller is based on the total available release time as T0, the initial pressure value of the gas cylinder as P0, and the current pressure value of the gas cylinder as P t The remaining available release time T is calculated by using the error factor δ t ; The controller sends the total available release time and the remaining available release time to the terminal display; The total available release time and the error factor are both preset values.

5. The anti-frost control system according to claim 4, characterized in that: The controller analyzes the gas cylinders with abnormal control valves according to the calculated pressure difference and the change of the remaining available release time, and sends the analysis to the terminal display, specifically including: When the pressure difference calculated by the controller according to the current internal pressure and external pressure of the cold storage is not less than the first balance value, the remaining available release time of at least one gas cylinder among the N gas cylinders continues to decrease and the duration reaches the first set time.

6. The anti-frost control system according to claim 5, characterized in that: The method of the controller analyzing the gas cylinders with abnormal control valves and feeding back to the terminal display specifically includes: The N gas cylinders are respectively provided with corresponding position sensing devices, and the position sensing devices are connected to the controller; Each position sensing device is used to sense the position signal of each corresponding gas cylinder and feed the position signal back to the controller, and the controller receives the position signal of each gas cylinder and sends it to the terminal display; The terminal display is used to display the status information of the gas cylinder and to alarm the gas cylinder with abnormal control valve.

7. The anti-frost control system according to claim 6, characterized in that: The terminal display is used to display the total available release time and the remaining available release time; The controller analyzes that when the remaining available release time of the current gas cylinder reaches a third set value, it feeds back to the terminal display, and the terminal display alarms the gas cylinder whose remaining available release time reaches the third set value in a manner different from the terminal display's alarm for gas cylinders with abnormal control valves.

8. The anti-frost control system according to claim 7, characterized in that: When the current pressure value of the gas cylinder reaches the second set value, the controller generates a third instruction and sends the third instruction to the terminal display, and the terminal display alarms in the same way as the gas cylinder alarm when the remaining available release time reaches the third set value.

9. An anti-frost control system according to any one of claims 1 or 2, characterized in that: Each gas cylinder is connected to a heating device, and the heating device is connected to a controller; The controller is used to store the start time and the second set time; The starting time is set to T0, the set time is set to T, and the current time is set to T1. When T1= T0+NT, where N is a natural number greater than 0, the controller controls the heating device to work.

10. The anti-frost control system according to claim 9, characterized in that: Each gas cylinder is also connected with a drainage device.

Images