Warm air blower

Abstract

The utility model discloses a fan heater, which belongs to the technical field of fans, and adopts the technical scheme that the fan heater is characterized by comprising a sealed shell, an air inlet is formed in one of two opposite side walls of the shell, and an air outlet is formed in the other end of the shell; the air inlet is provided with an air inlet pipe, and an air inlet fan is arranged in the air inlet pipe. The air outlet is provided with an air guide pipe, and the length of the air guide pipe is larger than the distance between the air inlet and the air outlet. The distance refers to the length between the center of the air inlet and the center of the air outlet. The device has the advantages that the air guide pipe with a certain length is installed at the air outlet, the air supply distance is increased, an air channel of the whole device is relatively sealed, and the air pressure is large; due to the fact that the air guide pipe with a certain length is arranged, the constant-temperature heating device is particularly suitable for constant-temperature control of agricultural cultivation and industrial factory buildings and air heating in greenhouses, temperature conditions in the environments can be effectively improved, growth of animals and plants is promoted, and production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans, and particularly relates to a warm air fan. Background Art

[0002] Agricultural electric fan heater is an electric heating device used in greenhouses, farms and other agricultural fields. It is mainly composed of air heater and fan, using advanced and efficient non-red electric heating tubes, and equipped with imported high-efficiency light-trigger trigger switches. It is easy and reliable to operate in agriculture. It is suitable for various greenhouses and farms where air recirculation is allowed. When the air does not contain dust and flammable gas, it can be used for circulating air heating. Agricultural electric fan heater is the preferred product for upgrading the heat source of modern agriculture, and is the best hot air source configuration for agricultural breeding and planting.

[0003] The traditional agricultural air heater is affected by its structure, and the shell (air duct) is an open air duct. At the same time, the hot air delivered is diffused at the outlet end, with low wind pressure and short air delivery distance. Utility Model Content

[0004] The utility model aims to provide a heater with a relatively sealed air duct and an air guide pipe.

[0005] The utility model is realized by the following measures: a heater, characterized in that it comprises a sealed shell, one of two opposite side walls of the shell is provided with an air inlet, and the other end is provided with an air outlet;

[0006] The air inlet is equipped with an air inlet pipe, and an air intake fan is arranged in the air inlet pipe;

[0007] The air outlet is equipped with an air duct, and the length of the air duct is greater than the distance between the air inlet and the air outlet. The distance refers to the length between the center of the air inlet and the center of the air outlet. The housing is generally a rectangular box.

[0008] A plurality of heaters are arranged inside the housing, and the heaters are directly opposite to the air inlet and the air outlet. The heaters include an annular heating tube, which is designed as a long strip-shaped surrounding structure, which not only ensures the heating area, but also reduces the wind resistance.

[0009] The lower end surface of the bottom plate of the shell is provided with a plurality of wheels, so as to facilitate carrying to any place requiring heating.

[0010] A mounting plate is disposed on the upper surface of the bottom plate of the shell, and the heater is mounted on the mounting plate.

[0011] A protective net is arranged at the outer end of the air inlet pipe.

[0012] A control box is installed on the outer wall of the shell, and buttons and a display for human-computer interaction are arranged on the outer wall of the control box.

[0013] A screw is fixedly provided on the upper end surface of the housing and close to one end of the exhaust port, a telescopic rod is sleeved on the screw, a lifting ring is provided at the end and front end of the telescopic rod, and a lifting lug corresponding to the lifting ring is provided at the top of the outer wall of the air guide duct. The telescopic rod generally includes an outer sleeve rod and an inner sleeve rod, the two sleeve rods are connected by screws, and the telescopic rod is fixed by a nut.

[0014] The air guide duct is generally made of a flexible material, such as a corrugated tube, a rubber tube, etc.

[0015] The air outlet and the air inlet are generally circular holes, and the air guide duct and the air inlet duct are generally circular.

[0016] It also includes a relay control circuit for controlling the fan;

[0017] The relay control circuit includes a transistor Q4, the base of which is connected to a resistor R56 and one end of a resistor R57, the other end of the resistor R56 serves as a signal input end, the other end of the resistor R57 is connected to the emitter of the transistor Q4 and is grounded, the collector of the transistor Q4 is connected to the anode of the diode and pin 2 of the relay, pin 1 of the relay serves as a relay power input end and is connected to the cathode of the diode, and the normally open contact of the relay is connected in series to the power supply circuit of the fan.

[0018] It also includes a temperature measurement circuit for the fan, which includes temperature sensors H6 and H7, wherein pin 1 of the temperature sensor H7 is connected to pin 2 of the temperature sensor H6 and one end of a resistor R79, the other end of the resistor R79 is connected to one end of a resistor R81 and pin 5 of an operational amplifier U22.2, pin 6 of the operational amplifier U22.2 is connected to one end of a resistor R80 and a resistor R82, the other end of the resistor R80 is connected to pin 2 of the temperature sensor H7, the other end of the resistor R82 is connected to one end of resistors R84 and R83, pin 7 of the operational amplifier U22.2 is connected to one end of a resistor R85 and the other end of R83, the other end of R85 is connected to one end of a capacitor C70 and a capacitor C71 and serves as a signal output end, the other ends of the capacitor C70 and the capacitor C71 are grounded, and the other ends of the resistor R84 and the resistor R81 are grounded;

[0019] Pin 1 of the temperature sensor H6 is connected to the collectors of transistor Q6 and transistor Q5, the emitter of transistor Q6 is connected to the base of transistor Q5, the base of transistor Q6 is connected to one end of resistor R74, the other end of resistor R74 is connected to pin 1 of operational amplifier U22.1, pin 3 of operational amplifier U22.1 is connected to one end of resistor R76, one end of resistor R77 and pin 3 of voltage regulator U23, the other end of resistor R77 is connected to one end of resistor R78 and pin 1 of voltage regulator U23 The other end of resistor R78 is grounded, the No. 2 pin of the voltage regulator U23 is grounded, the other end of resistor R76 is connected to VCC and one end of capacitor C69, the other end of capacitor C69 is grounded, the emitter of transistor Q5 is connected to No. 2 pin of operational amplifier U22.1 and one end of resistor R73, the other end of resistor R73 is connected to VCC and capacitor C67, the other end of capacitor C67 is grounded, No. 8 pin of operational amplifier U22.1 is connected to VCC and capacitor C68, and No. 4 pin of operational amplifier U22.1 is grounded. The actual positions of temperature sensors H6 and H7 can be determined according to actual conditions.

[0020] In addition, some parts not described in this application can be implemented using existing technologies, so they will not be described in detail.

[0021] The beneficial effects brought about by the technical solution provided by the embodiment of the utility model are: an air duct with a certain length is installed at the exhaust outlet, which increases the air supply distance, and the air duct of the entire device is relatively sealed, and the wind pressure is relatively large; the air duct has a certain length, a hanging ring is provided on the telescopic rod, and a hanging ear is provided on the air duct, so that the air duct can be supported by the existing rope; because the air duct has a certain length, it is particularly suitable for agricultural breeding, constant temperature control of industrial plants and air heating in greenhouses, and can effectively improve the temperature conditions in these environments, promote the growth of animals and plants, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present utility model, a brief introduction will be given to the drawings used in the embodiments below. Obviously, the drawings listed below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the housing in the embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of the structure of the telescopic rod in the embodiment of the utility model;

[0026] Figure 4 It is a relay control circuit in the embodiment of the utility model;

[0027] Figure 5 It is a temperature measuring circuit in the embodiment of the utility model.

[0028] In the accompanying drawings, the components represented by each number are listed as follows: 1. Shell; 2. Air inlet duct; 3. Air guide duct; 4. Control box; 5. Display; 6. Wheels; 7. Mounting plate; 8. Heater; 9. Fan; 10. Telescopic rod; 11. Lifting ring; 12. Screw; 13. Nut; 101. Base plate; 301. Lifting ear. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. Of course, the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] Embodiment 1:

[0031] See also Figure 1-Figure 5 A heater, characterized in that it comprises a sealed housing 1, wherein one of the two opposite side walls of the housing 1 is provided with an air inlet and the other end is provided with an air outlet;

[0032] The air inlet is provided with an air inlet pipe 2, and an air inlet fan 9 is arranged in the air inlet pipe 2;

[0033] The exhaust port is provided with an air duct 3, the length of which is greater than the distance between the air inlet and the exhaust port. The distance refers to the length between the center of the air inlet and the center of the exhaust port. The housing 1 is generally a rectangular box.

[0034] A plurality of heaters 8 are arranged inside the housing 1, and the heaters 8 are directly opposite to the air inlet and the air outlet. The heaters 8 include an annular heating tube, which is designed as a long strip-shaped surrounding structure, which not only ensures the heating area, but also reduces the wind resistance.

[0035] A plurality of wheels 6 are disposed on the lower end surface of the bottom plate 101 of the housing 1 to facilitate transportation to any location requiring heating.

[0036] A mounting plate 7 is provided on the upper end surface of the bottom plate 101 of the housing 1 , and the heater 8 is mounted on the mounting plate 7 .

[0037] The outer end of the air inlet pipe 2 is provided with a protective net.

[0038] A control box 4 is installed on the outer wall of the housing 1 , and buttons and a display 5 for human-computer interaction are arranged on the outer wall of the control box 4 .

[0039] A screw rod 12 is fixedly provided on the upper end surface of the housing 1 and close to one end of the exhaust port, and a telescopic rod 10 is sleeved on the screw rod 12. A lifting ring 11 is provided at the end and the front end of the telescopic rod 10, and a lifting lug 301 corresponding to the lifting ring 11 is provided on the top of the outer wall of the air guide 3. The telescopic rod 10 generally includes an outer sleeve rod and an inner sleeve rod, and the two sleeve rods are connected by screws. The telescopic rod 10 is fixed by a nut 13.

[0040] The air guide pipe 3 is generally made of a flexible material, such as a corrugated pipe, a rubber pipe, etc.

[0041] The air outlet and the air inlet are generally circular holes, and the air guide duct 3 and the air inlet duct 2 are generally circular.

[0042] Embodiment 2:

[0043] See also Figure 1-Figure 5 , based on the first embodiment, further comprising a relay control circuit for controlling the fan;

[0044] The relay control circuit includes a transistor Q4, the base of the transistor Q4 is connected to resistors R56 and one end of resistor R57, the other end of resistor R56 serves as a signal input end, the other end of resistor R57 is connected to the emitter of the transistor Q4 and grounded, the collector of the transistor Q4 is connected to the anode of the diode and pin 2 of the relay, pin 1 of the relay serves as a relay power input end and is connected to the cathode of the diode, and the normally open contact of the relay is connected in series to the power supply circuit of the fan.

[0045] The working principle of the relay control circuit is as follows: when the input signal IN2 becomes high (i.e., a high-level signal is input), current is sent to the base of transistor Q4 through resistor R56. The base current turns Q4 on, and a path is formed between the collector and the emitter. After Q4 is turned on, the 12VIN power supply supplies power to the relay coil through D20, so that the relay coil is energized. After the relay coil is energized, its normally open contacts (OC2 and NO2) are closed, thereby connecting the 220V power supply and starting the fan. When the input signal IN2 becomes low (i.e., a low-level signal is input), R57 pulls down the base potential of Q4, Q4 is cut off, the relay coil loses power, and its normally open contacts return to the disconnected state, cutting off the 220V power supply, and the fan stops working. D20 is installed between the 12VIN power supply and the relay coil, and the direction of the diode is forward toward 12VIN. This means that when the 12VIN power supply is positive, the diode is turned on. However, when the relay coil is de-energized, a reverse voltage is generated due to the inductive characteristics of the coil, which may damage other components in the circuit. The D20 reverse voltage protection allows these reverse currents to pass through the diode, thereby protecting the transistors and other components in the circuit from the effects of reverse voltage.

[0046] It also includes a temperature measurement circuit for the fan, which includes temperature sensors H6 and H7, wherein pin 1 of temperature sensor H7 is connected to pin 2 of temperature sensor H6 and one end of resistor R79, the other end of resistor R79 is connected to one end of resistor R81 and pin 5 of operational amplifier U22.2, pin 6 of operational amplifier U22.2 is connected to one end of resistor R80 and resistor R82, the other end of resistor R80 is connected to pin 2 of temperature sensor H7, the other end of resistor R82 is connected to one end of resistors R84 and R83, pin 7 of operational amplifier U22.2 is connected to one end of resistor R85 and the other end of R83, the other end of R85 is connected to one end of capacitor C70 and capacitor C71 and serves as a signal output end, the other end of capacitor C70 and capacitor C71 is grounded, and the other end of resistor R84 and resistor R81 is grounded;

[0047] Pin 1 of the temperature sensor H6 is connected to the collectors of transistor Q6 and transistor Q5, the emitter of transistor Q6 is connected to the base of transistor Q5, the base of transistor Q6 is connected to one end of resistor R74, the other end of resistor R74 is connected to pin 1 of operational amplifier U22.1, pin 3 of operational amplifier U22.1 is connected to one end of resistor R76, one end of resistor R77 and pin 3 of voltage regulator U23, the other end of resistor R77 is connected to one end of resistor R78 and pin 1 of voltage regulator U23 The other end of resistor R78 is grounded, the No. 2 pin of the voltage regulator U23 is grounded, the other end of resistor R76 is connected to VCC and one end of capacitor C69, the other end of capacitor C69 is grounded, the emitter of transistor Q5 is connected to No. 2 pin of operational amplifier U22.1 and one end of resistor R73, the other end of resistor R73 is connected to VCC and capacitor C67, the other end of capacitor C67 is grounded, No. 8 pin of operational amplifier U22.1 is connected to VCC and capacitor C68, and No. 4 pin of operational amplifier U22.1 is grounded. The actual positions of temperature sensors H6 and H7 can be determined according to actual conditions.

[0048] Among them, the temperature sensor is usually a thermistor (such as NTC or PTC), or an integrated temperature sensor chip (such as LM35). It will output different voltage signals according to the change of ambient temperature. The output signal of the temperature sensor is connected to the circuit, and the signal is smoothed by the filter capacitor (such as C71 and C70) to reduce noise; the voltage regulator U23 (CJ431) provides a stable 2.5V reference voltage, which is compared with the output voltage of the temperature sensor. The function of the operational amplifier U22.1 is to compare the output voltage of the temperature sensor with the reference voltage and output a difference signal; the operational amplifier U22.2 amplifies the compared signal to make it reach a level suitable for ADC sampling. The amplified signal enters the ADC (analog-to-digital converter) through R84, and the ADC converts the analog signal into a digital signal for further digital processing and display. If the circuit is equipped with a temperature control function, the amplified signal can also drive the transistor (Q5 and Q6) to adjust the operating state of the fan by controlling the on and off of the current. For example, when the temperature exceeds a certain set value, the control circuit may start the fan to reduce the temperature.

[0049] In addition, some parts not described in this application can be implemented using existing technologies, so they will not be described in detail.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fan heater, characterized in that: It comprises a sealed shell, and one of the two opposite side walls of the shell is provided with an air inlet, and the other end is provided with an air outlet; The air inlet is equipped with an air inlet pipe, and an air intake fan is arranged in the air inlet pipe; The air outlet is equipped with an air guide pipe, and the length of the air guide pipe is greater than the distance between the air inlet and the air outlet.

2. The air heater according to claim 1, characterized in that: A plurality of heaters are arranged inside the shell, and the heaters are directly facing the air inlet and the air outlet.

3. The air heater according to claim 1, characterized in that: A plurality of wheels are arranged on the lower end surface of the bottom plate of the shell.

4. The air heater according to claim 2, characterized in that: A mounting plate is disposed on the upper surface of the bottom plate of the shell, and the heater is mounted on the mounting plate.

5. The air heater according to claim 1, characterized in that: A protective net is arranged at the outer end of the air inlet pipe.

6. The air heater according to claim 1, characterized in that: A control box is installed on the outer wall of the shell, and buttons and a display for human-computer interaction are arranged on the outer wall of the control box.

7. The air heater according to claim 1, characterized in that: A screw is fixedly provided on the upper end surface of the shell and close to one end of the exhaust port, a telescopic rod is sleeved on the screw, the end and front end of the telescopic rod are both provided with hanging rings, and the top of the outer wall of the air duct is provided with a hanging ear corresponding to the hanging ring.

8. The air heater according to claim 1, characterized in that: It also includes a relay control circuit for controlling the fan; The relay control circuit includes a transistor Q4, the base of which is connected to a resistor R56 and one end of a resistor R57, the other end of the resistor R56 serves as a signal input end, the other end of the resistor R57 is connected to the emitter of the transistor Q4 and is grounded, the collector of the transistor Q4 is connected to the anode of the diode and pin 2 of the relay, pin 1 of the relay serves as a relay power input end and is connected to the cathode of the diode, and the normally open contact of the relay is connected in series to the power supply circuit of the fan.

9. The air heater according to claim 1, characterized in that: It also includes a temperature measurement circuit for the fan, which includes temperature sensors H6 and H7, wherein pin 1 of the temperature sensor H7 is connected to pin 2 of the temperature sensor H6 and one end of a resistor R79, the other end of the resistor R79 is connected to one end of a resistor R81 and pin 5 of an operational amplifier U22.2, pin 6 of the operational amplifier U22.2 is connected to one end of a resistor R80 and a resistor R82, the other end of the resistor R80 is connected to pin 2 of the temperature sensor H7, the other end of the resistor R82 is connected to one end of resistors R84 and R83, pin 7 of the operational amplifier U22.2 is connected to one end of a resistor R85 and the other end of R83, the other end of R85 is connected to one end of a capacitor C70 and a capacitor C71 and serves as a signal output end, the other ends of the capacitor C70 and the capacitor C71 are grounded, and the other ends of the resistor R84 and the resistor R81 are grounded; Pin 1 of the temperature sensor H6 is connected to the collectors of transistor Q6 and transistor Q5, the emitter of transistor Q6 is connected to the base of transistor Q5, the base of transistor Q6 is connected to one end of resistor R74, the other end of resistor R74 is connected to pin 1 of operational amplifier U22.1, pin 3 of operational amplifier U22.1 is connected to one end of resistor R76, one end of resistor R77 and pin 3 of voltage regulator U23, the other end of resistor R77 is connected to one end of resistor R78 and pin 1 of voltage regulator U23 Pin, the other end of resistor R78 is grounded, pin 2 of the voltage regulator U23 is grounded, the other end of resistor R76 is connected to VCC and one end of capacitor C69, the other end of capacitor C69 is grounded, the emitter of transistor Q5 is connected to pin 2 of operational amplifier U22.1 and one end of resistor R73, the other end of resistor R73 is connected to VCC and capacitor C67, the other end of capacitor C67 is grounded, pin 8 of operational amplifier U22.1 is connected to VCC and capacitor C68, and pin 4 of operational amplifier U22.1 is grounded.

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