Accurate temperature control graphene electrothermal film device for substrate cultivation

Abstract

A precise temperature control graphene electrothermal film device for substrate cultivation comprises a graphene electrothermal film assembly used for heating a substrate in the substrate cultivation device; the graphene electrothermal film assembly comprises a graphene electrothermal film and a waterproof sealing sleeve, and the graphene electrothermal film is arranged in the waterproof sealing sleeve; a temperature control system; the temperature control system is connected with the graphene electrothermal film and is used for controlling the graphene electrothermal film; the temperature control system comprises a temperature sensor, a control module, a power supply module and a peripheral module; the peripheral module comprises a communication module and a WIFI module. According to the accurate temperature control graphene electrothermal film device for substrate cultivation, through improvement of a graphene electrothermal film heating and temperature control system, the heating temperature of a substrate can be accurately controlled to be + / -0.5 DEG C, accurate temperature increasing of roots is achieved, the problem that growth is affected by the temperature is avoided, man-machine interaction communication is achieved, and operation is convenient. The problem of online temperature control is solved, and interconnection between substrate cultivation temperature data and the cloud is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heating equipment technical field, concretely relates to a substrate cultivation is with accurate temperature control graphene electric heating film device. BACKGROUND

[0002] In recent years, the application of graphene electric heating film technology has been widely recognized, including floor heating, wall heating, heated clothing, antibacterial underwear, and heaters. The heating characteristics of graphene electric heating film are the same as resistance heating, which converts electrical energy into heat energy. The development and application of its heating characteristics and other beneficial characteristics for agricultural breeding will be a great help to agricultural production.

[0003] At present, the substrate heating technical scheme in the prior art usually adopts air energy heat pump heating, and the specific mode is as follows: heating pipes are laid in the planting substrate, the air energy heat pump heats water, the water enters the pipes in the substrate through a circulating system, and the substrate is heated. Through the application and discussion of the air energy heat pump heating planting substrate mode, although this mode solves the demand for substrate heating to some extent, the air energy heat pump facility has large volume (occupies large space), is troublesome to install (requires equipment foundation), has slow initial heating speed (according to the length of the embedded pipe, high-temperature water needs to be preheated, generally not less than 30 minutes), the embedded pipe in the substrate occupies the substrate space in the cultivation tank, and the temperature difference of the substrate is large (the temperature control is the circulating system return water temperature).

[0004] Therefore, in order to solve the above technical problems, the utility model designs a graphene electric heating film device for substrate cultivation accurate temperature control, which has small occupied volume, is simple to install, has fast start-up heating speed (usually 3-5 minutes) of the graphene electric heating film, uniform heating, and through the improvement of the temperature control system, the heating temperature of the substrate can be accurately controlled to ±0.5℃, the root accurate temperature increasing effect is achieved, the influence of temperature on the growth of the cultivated plants can be avoided, human-computer interaction communication is realized, the problem of online temperature control is solved, and substrate cultivation temperature data and cloud interconnection are realized. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the above-mentioned defects, and provides a substrate cultivation accurate temperature control graphene electric heating film device, which has reasonable design, selects graphene electric heating film as the heating unit of the device to adapt to the structure of the substrate cultivation device more flexibly, has small occupied volume, is simple to install, has fast start-up heating speed, the temperature of the substrate is uniform, the heating temperature accuracy of the substrate is improved through the improvement of the temperature control system, the root accurate temperature increasing effect is achieved, the influence of temperature on the growth of the cultivated plants can be avoided, human-computer interaction communication is realized, and the application prospect is wide.

[0006] Technical scheme: a substrate cultivation precision temperature control graphene electric heating film device, comprising:

[0007] Graphene electric heating film assembly; the graphene electric heating film assembly is arranged between the substrate cultivation device and the substrate, and is used for heating the substrate in the substrate cultivation device; the graphene electric heating film assembly comprises a graphene electric heating film and a waterproof sleeve, and the graphene electric heating film is arranged in the waterproof sleeve;

[0008] Temperature control system; the temperature control system is connected with the graphene electric heating film and is used for controlling the graphene electric heating film; the temperature control system comprises a temperature sensor, a control module, a power module and an external module, the temperature sensor, the power module and the external module are connected with the control module respectively, and the control module is connected with the graphene electric heating film; the external module comprises an LCD display screen, a communication module and a WIFI module.

[0009] The graphene electric heating film device selects graphene electric heating film as the heating unit of the device, the graphene electric heating film has good flexibility, can be bent, can more flexibly adapt to the structure of the substrate cultivation device, has small power, high thermal efficiency, surface heating, uniform heating, and is safe and reliable.

[0010] The graphene electric heating film assembly is simple to place, after the graphene electric heating film is loaded into the waterproof sleeve, the graphene electric heating film can be directly placed or inserted between the substrate cultivation device and the substrate, and the waterproof sleeve can protect the graphene electric heating film from corrosion of the substrate and has a waterproof function. After the graphene electric heating film is loaded into the waterproof sleeve, the flat shape occupies a very small volume, the start-up heating speed is fast, the temperature of the substrate is uniform, and the temperature difference is small. Preferably, the waterproof sleeve is one of a PVC waterproof sleeve, a PTFE waterproof sleeve and a PE waterproof sleeve.

[0011] The temperature sensor collects the required temperature data, transmits the collected temperature data to the control module for processing, displays the current temperature and the set temperature through the LCD display screen, and provides a user interface for parameter setting and operation. The man-machine interactive communication mainly completes data interaction in the mode of the communication module and the WIFI module, that is, realizes data serial communication through the communication module and sends and receives data through the WIFI module.

[0012] Further, the Internet of Things is selected as the host computer of the temperature control system, the control module is connected with the cloud server, real-time data is uploaded to the cloud server through the WIFI module, online real-time observation of temperature change, trend and other data can be realized, long-term data storage and backtracking analysis are realized, the problem of online temperature control is solved, and substrate cultivation temperature data are interconnected with the cloud.

[0013] Through the temperature control system, the heating temperature of the graphene electric heating film on the substrate can be accurately controlled, the root of the cultivated object can be accurately heated, the root of the cultivated object will not be burned, and the growth of the cultivated object can be promoted.

[0014] Further, the above-mentioned precise temperature control graphene electric heating film device for substrate cultivation, the temperature sensor comprises a temperature sensor one for monitoring room temperature and a temperature sensor two for monitoring substrate temperature; the temperature sensor is a PT1000 resistance temperature sensor,

[0015] According to the accuracy of the measured temperature and the use requirement, the PT1000 resistance temperature sensor is selected, the sensor accuracy is one thousandth, and the system error has good effect.

[0016] Further, the above-mentioned precise temperature control graphene electric heating film device for substrate cultivation, the control module is an STM32 single-chip microcomputer.

[0017] The STM32 single-chip microcomputer is selected as the main control unit of the temperature control system, which has high computing power and rich peripheral interfaces, and the internal A / D samples and converts data, is suitable for real-time temperature control and data acquisition application, and can meet the needs of different temperature control in the control effect, has good control effect when the temperature difference is small, and the temperature error fluctuates within ±0.5℃.

[0018] Further, the above-mentioned precise temperature control graphene electric heating film device for substrate cultivation, the peripheral module further comprises a key module, and the key module is connected with the control module.

[0019] The temperature is set through the keys (STE key, ADD key, SUB key, BACK key and the like) of the key module, and the temperature is displayed through the LCD display screen.

[0020] Further, the above-mentioned precise temperature control graphene electric heating film device for substrate cultivation, the communication module is a MAX485 communication module; and the WIFI module is a USR-C216 WiFi wireless module.

[0021] The MAX485 communication module is selected to realize serial communication. Preferably, the MAX485 communication module is connected with a power supply and a ground, and the A end and the B end of the MAX485 communication module need to be connected with a 120-ohm resistor in parallel to reduce external interference.

[0022] The USR-C216 WiFi wireless module is selected, and data transmission and reception are realized through a WiFi network. Specifically, the USR-C216 WiFi wireless module realizes data Modbus transmission through a TCP transmission protocol. In the working process, the USR-C216 WiFi wireless module receives serial port data and sends it to a remote device through a WiFi network, and also receives data from the remote device and outputs it to the control module through WiFi. Preferably, a capacitor needs to be connected in parallel at the interface during welding to suppress the influence of the external environment on data transmission.

[0023] Further, the above-mentioned precision temperature control graphene electrothermal film device for substrate cultivation further comprises:

[0024] A waterproof film is arranged between the graphene electrothermal film assembly and the substrate, and is used to prevent the liquid in the substrate from exuding.

[0025] A heat preservation plate is arranged between the graphene electrothermal film assembly and the substrate cultivation device, and is used to reduce heat loss.

[0026] The cultivation substrate is usually selected to be coco coir, and the liquid in the cultivation substrate is nutrient solution and automatic drip irrigation water. By laying a waterproof film layer, the liquid in the cultivation substrate can be prevented from exuding. Preferably, the waterproof film is one of PE waterproof film, PVC waterproof film, EVA waterproof film and TPO waterproof film.

[0027] When the graphene electrothermal film assembly heats the substrate, heat will diffuse to the surrounding environment. The heat preservation plate has the characteristics of low thermal conductivity, which can prevent heat from being transmitted from the substrate cultivation device to the external environment, so that more heat is concentrated near the substrate, which helps to keep the temperature of the substrate relatively stable. When the external environment temperature fluctuates, the heat preservation plate can buffer the influence of such fluctuations on the temperature of the substrate.

[0028] Further, the above-mentioned precision temperature control graphene electrothermal film device for substrate cultivation, the width of the graphene electrothermal film is 15-20 cm.

[0029] The graphene electrothermal film adopts a narrow film (10 cm - 15 cm wide), and the design of the narrow film can more flexibly adapt to the structure of the substrate cultivation device. For example, in some substrate cultivation tanks with partitions or curved shapes, the narrow film can be laid along the shape of the tank more easily, without the problem of wide film being difficult to bend or unable to fit the device structure. In addition, in substrate cultivation, the root distribution of different plants may have certain regularity, and the narrow film can be laid according to the distribution of the plant root system to realize precise heating of the concentrated root area and improve energy utilization efficiency.

[0030] Further, the above-mentioned substrate cultivation precision temperature control graphene electric heating film device, the graphene electric heating film comprises:

[0031] The graphene heating film body comprises an insulating base material and a graphene coating, wherein the graphene coating is arranged on the surface of the insulating base material in a spaced manner;

[0032] The conductive copper strip is symmetrically arranged on the upper and lower sides of the graphene heating film body and connected with the graphene heating film body;

[0033] The conductive silver paste is arranged between the graphene heating film body and the conductive copper strip;

[0034] The insulating waterproof layer is sleeved outside the graphene heating film body.

[0035] When the graphene heating film body is electrified, the current is conducted to the graphene heating film body through the conductive copper strip electrode and the conductive silver paste bridge electrode, the graphene paste is arranged on the surface of the insulating base material in a spaced manner to form a heating film body structure, so that the current generates heat in the spaced graphene area when passing through, and the heat is gradually transmitted to the surrounding environment, thereby achieving heating of the surrounding environment.

[0036] Further, the above-mentioned substrate cultivation precision temperature control graphene electric heating film device, the graphene electric heating film two ends are provided with insulating cement.

[0037] The insulating cement arranged at the two ends of the graphene electric heating film can prevent electric leakage.

[0038] The substrate cultivation precision temperature control graphene electric heating film device has the advantages that:

[0039] (1) The substrate cultivation precision temperature control graphene electric heating film device selects graphene electric heating film as a heating unit of the device, the graphene electric heating film has good flexibility, can be bent, can more flexibly adapt to the structure of the substrate cultivation device, has small use power, high heat efficiency, surface heating, uniform heating, and is safe and reliable.

[0040] (2) The substrate cultivation precision temperature control graphene electric heating film device is reasonable in design, the graphene electric heating film is directly placed or inserted between the substrate cultivation device and the substrate after being arranged in the waterproof sleeve, the device is simple to place, has a small occupied volume due to the flat shape, the waterproof sleeve can protect the graphene electric heating film from corrosion of the substrate and has a waterproof function; the waterproof film layer can prevent liquid in the cultivation substrate from leaking out; the heat preservation plate can prevent heat from being transmitted from the substrate cultivation device to the external environment, so that the heat is more concentrated near the substrate, and the relative stability of the substrate temperature is maintained.

[0041] (3) The substrate cultivation precision temperature control graphene electrothermal film device optimizes the temperature control system, collects required room temperature and substrate temperature data through a temperature sensor, transmits the collected temperature data to a control module STM32 single-chip microcomputer for efficient processing, can meet the needs of different temperature control, has good control effect when the temperature difference is small, the temperature error fluctuates within ±0.5℃, displays the current temperature and the set temperature through an LCD display screen, and provides a user interface for parameter setting and operation; data interaction is completed through a communication module and a WIFI module, human-computer interaction communication is realized, real-time data can be uploaded to a cloud server through the WIFI module, online real-time observation of temperature changes, trends and other data is realized, long-term data storage and backtracking analysis are realized, the problem of online temperature control is solved, and substrate cultivation temperature data is interconnected with the cloud. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is the overall framework diagram of the substrate cultivation precision temperature control graphene electrothermal film device.

[0043] Figure 2 It is the installation schematic view of the substrate cultivation precision temperature control graphene electrothermal film device.

[0044] Figure 3 It is the substrate cultivation temperature data and cloud interconnection schematic view of the substrate cultivation precision temperature control graphene electrothermal film device.

[0045] Figure 4 It is the graphene electrothermal film structure schematic view of the substrate cultivation precision temperature control graphene electrothermal film device.

[0046] In the figure: graphene electrothermal film assembly 1, graphene electrothermal film 11, graphene heating film body 111, insulating base material 1111, graphene coating 1112, conductive copper strip 112, conductive silver paste 113, insulating waterproof layer 114, waterproof sleeve 12, insulating cement 13, temperature sensor 2, temperature sensor one 21, temperature sensor two 22, control module 3, power module 4, peripheral module 5, LCD display screen 51, communication module 52, WIFI module 53, key module 54, waterproof film 6, heat preservation plate 7, substrate cultivation device a. DETAILED DESCRIPTION

[0047] The utility model is further illustrated below in combination with the accompanying drawings, Figure 1 、 2 , 3, 4 and example 1, example 2.

[0048] Example 1

[0049] The utility model discloses a substrate cultivation precision temperature control graphene electric heating film device, to the deficiency (volume is big, installation is troublesome, heating initial speed is slow, substrate temperature temperature difference is big) of air energy heat pump substrate heating technology in the prior art, selects graphene electric heating film 11 as the heating unit of device, and graphene electric heating film 11 has good flexibility, can bend, can more flexibly adapt to the structure of substrate cultivation device, and the use power is small, and the thermal efficiency is high, and the surface heating is even, and the heating is safe and reliable.

[0050] Further, the width of the graphene electric heating film 11 is 15-20 cm, and the design of the narrow film can more flexibly adapt to the structure of the substrate cultivation device, and can also be laid according to the distribution of the plant root system, to realize precise heating of the root system concentration area and improve energy utilization efficiency.

[0051] As shown in Figure 2 The utility model discloses a substrate cultivation precision temperature control graphene electric heating film device, graphene electric heating film assembly 1 sets up between substrate cultivation device a and substrate, is used for heating the substrate in substrate cultivation device a. The graphene electric heating film assembly 1 is simple to place, after graphene electric heating film 11 is packed into waterproof envelope 12, can be directly placed or inserted between substrate cultivation device a and substrate, and waterproof envelope 12 can protect graphene electric heating film 11 from substrate corrosion and have waterproof function.

[0052] Specifically, the preparation method of the graphene electric heating film assembly 11 is as follows: the graphene electric heating film 11 is wrapped with a waterproof envelope 12, the unwinding width of the waterproof envelope 12 needs to be 3 to 5 times the width of the graphene electric heating film 11, and during wrapping, multiple fixing points are arranged in the middle, fixed with transparent tape, the outer edge is sealed with narrow double-sided tape, and the two ends are not sealed, so that the air in the waterproof envelope 11 can be easily discharged after being heated, and after the graphene electric heating film 11 stops working, the waterproof envelope 12 will automatically adhere to the graphene electric heating film 11 to form a closed state.

[0053] After the graphene electric heating film 11 is packed into the waterproof envelope 12, it is in a flat shape, occupies a very small volume, has a fast heating speed, and the substrate is uniformly heated with a small temperature difference.

[0054] Further, as shown in Figure 2 A waterproof film 6 is further laid between the graphene electric heating film assembly 1 and the substrate, the cultivation substrate is usually selected from coco coir, and the liquid in the cultivation substrate is nutrient solution and automatic drip irrigation water, and by laying the waterproof film 6 as a waterproof film layer, the liquid in the cultivation substrate can be prevented from exuding.

[0055] Further, as shown in Figure 2As shown, the heat preservation plate 7 is also inserted between the graphene electrothermal film assembly 1 and the substrate cultivation device, and the heat preservation plate 7 has the characteristics of low thermal conductivity, which can prevent heat from being transmitted to the external environment when the graphene electrothermal film assembly 1 heats the substrate, so that the heat is more concentrated near the substrate, which helps to keep the temperature of the substrate relatively stable, and the heat preservation plate can buffer the influence of the temperature fluctuation of the external environment on the temperature of the substrate.

[0056] As Figure 4 shown, the graphene electrothermal film 11 comprises a graphene heating film body 111, a conductive copper strip 112, a conductive silver paste 113, and an insulating waterproof layer 114. When electrified, the current will be conducted to the graphene heating film body 111 through the conductive copper strip 112 electrode and the conductive silver paste 113 bridge electrode, and heat will be generated in the spaced graphene area, which will gradually be transmitted to the surrounding environment, thereby achieving heating of the surrounding environment.

[0057] The preparation method of the graphene electrothermal film comprises the following steps: coating graphene slurry on the surface of an insulating base material 1111 by a physical heavy pressing method to obtain a graphene heating film body 111, then arranging a conductive copper strip 112 as an electrode on the upper and lower sides of the graphene heating film body 111, then arranging a conductive silver paste 113 as a bridge electrode between the graphene heating film body 111 and the copper electrode, and finally sleeving an insulating waterproof layer 114 outside the graphene heating film body 111.

[0058] Further, the insulating cement 13 is arranged at both ends of the graphene electrothermal film 11, which can prevent electric leakage.

[0059] Example 2

[0060] Based on the above structural basis of example 1, as Figure 1 , 3 shown.

[0061] The substrate cultivation precision temperature control graphene electrothermal film device improves the temperature control system, so that the temperature of the substrate is more uniform, the temperature difference is smaller, the root of the cultivated object is always in the most suitable temperature for growth, and the effect of precise root heating is achieved.

[0062] As Figure 1As shown, the temperature control system, the temperature sensor 2 includes a temperature sensor one 21 for monitoring room temperature and a temperature sensor two 22 for monitoring substrate temperature, according to the accuracy of the measured temperature and the use of PT1000 resistance temperature sensor, the sensor accuracy is one thousandth, and the system error has good effect. The temperature sensor 2 collects the room temperature and the substrate temperature data, and transmits the collected temperature data to the control module 3 for processing. The STM32 single-chip microcomputer is selected as the control module 3, which has high computing power and rich peripheral interfaces. The internal A / D samples and converts data. In terms of control effect, it can meet the needs of different temperature control, and has good control effect when the temperature difference is small. The temperature error fluctuates within ±0.5℃.

[0063] The temperature control system designs a peripheral module 5, which clearly displays the current temperature and the set temperature through the LCD display screen 51, and provides a user interface for parameter setting and operation. The keys (STE key, ADD key, SUB key, BACK key, etc.) of the key module 54 are operated.

[0064] In addition, data interaction can be completed through the communication module 52 and the WIFI module 53, that is, data serial communication is realized through the communication module 52, and data transmission and reception are realized through the WIFI module 53.

[0065] Further, the MAX485 communication module is selected to realize serial communication. The USR-C216 WiFi wireless module is selected to realize data transmission and reception through the WiFi network. Specifically, the USR-C216 WiFi wireless module realizes Modbus data transmission through the TCP transmission protocol. In the working process, the USR-C216 WiFi wireless module receives serial port data and sends it to the remote device through the WiFi network, and also receives data from the remote device and outputs it to the control module through the WiFi.

[0066] Further, as shown in Figure 3 The industrial Internet of Things is selected as the host computer of the temperature control system, so that the control module 3 is connected with the cloud server. The real-time data is uploaded to the cloud server through the WIFI module 53, so that the online real-time observation of temperature change, trend and other data can be realized, and long-term data storage and backtracking analysis can be realized, so that the online temperature control problem is solved, and the substrate cultivation temperature data is interconnected with the cloud.

[0067] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements can be made without departing from the principle of the present application, and these improvements should also be regarded as the protection range of the present application.

Claims

1. A precision temperature control graphene electric heating film device for substrate cultivation, characterized in that, The application relates to a graphene electric heating film assembly (1) which is arranged between a substrate cultivation device and a substrate and is used for heating the substrate in the substrate cultivation device; the graphene electric heating film assembly (1) comprises a graphene electric heating film (11) and a waterproof sleeve (12), and the graphene electric heating film (11) is arranged in the waterproof sleeve (12). A temperature control system is connected with the graphene electric heating film (11) and is used for controlling the graphene electric heating film (11); the temperature control system comprises a temperature sensor (2), a control module (3), a power module (4) and an external module (5), the temperature sensor (2), the power module (4) and the external module (5) are connected with the control module (3) respectively, and the control module (3) is connected with the graphene electric heating film (11); the external module (5) comprises an LCD display screen (51), a communication module (52) and a WIFI module (53). The temperature sensor (2) comprises a temperature sensor one (21) for monitoring room temperature and a temperature sensor two (22) for monitoring substrate temperature; the temperature sensor (2) is a PT1000 resistance temperature sensor.

2. The precision temperature control graphene electrothermal film device for substrate cultivation according to claim 1, characterized in that, The control module (3) is an STM32 single-chip microcomputer.

3. The precision temperature control graphene electrothermal film device for substrate cultivation according to claim 1, characterized in that, The external module (5) further comprises a key module (54) which is connected with the control module (3).

4. The precision temperature control graphene electrothermal film device for substrate cultivation according to claim 1, characterized in that, The communication module (52) is a MAX485 communication module, and the WIFI module (53) is a USR-C216 WiFi wireless module.

5. The precision temperature control graphene electrothermal film device for substrate cultivation according to claim 1, characterized in that, Further comprising:

6. The precision temperature control graphene electrothermal film device for substrate cultivation according to claim 1, characterized in that, A waterproof film (6) which is arranged between the graphene electric heating film assembly (1) and the substrate and is used for preventing liquid in the substrate from exuding outward; A heat preservation plate (7) which is arranged between the graphene electric heating film assembly (1) and the substrate cultivation device and is used for reducing heat loss. The width of the graphene electric heating film (11) is 15-20 cm.

7. The precision temperature control graphene electro-thermal film device for substrate cultivation according to claim 1, characterized in that, The graphene electric heating film (11) comprises: 8.The precision temperature control graphene electric heating film device for substrate cultivation of claim 1, wherein, A graphene heating film body (111) which comprises an insulating base material (1111) and graphene coating (1112), and the graphene coating (1112) is arranged on the surface of the insulating base material (1111) at intervals; A conductive copper strip (112) which is symmetrically arranged on the upper and lower sides of the graphene heating film body (111) and is connected with the graphene heating film body (111); A conductive silver paste (113) which is arranged between the graphene heating film body (111) and the conductive copper strip (112); An insulating waterproof layer (114) which is sleeved on the outer side of the graphene heating film body (111). Insulating mastic (13) is arranged at both ends of the graphene electric heating film (11). 9.The precision temperature control graphene electric heating film device for substrate cultivation according to claim 1, characterized in that, ​

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