Compressed air heater

Abstract

The utility model discloses a compressed air heater, and relates to the technical field of compressed air heating equipment, and the compressed air heater comprises a pressure cylinder, a mounting cavity is formed in the pressure cylinder, an electric heating pipe is arranged in the mounting cavity, fins are spirally mounted on the side wall of the electric heating pipe, a bottom plate is arranged on the end face of the pressure cylinder, and one end of the electric heating pipe is mounted on the bottom plate; a plurality of electric heating pipes are arranged on the outer side of the air inlet pipe in the circumferential direction, a heat conduction piece is installed at one end of each electric heating pipe, a temperature sensor is fixed to each heat conduction piece, and one end of each temperature sensor is in threaded connection with the corresponding heat conduction piece. The other end of the temperature sensor extends out of the pressure cylinder, an air outlet pipe is arranged at one end of the pressure cylinder, one end of the air outlet pipe communicates with the mounting cavity, and the other end of the air outlet pipe is connected with a control assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed air heating equipment, in particular to a compressed air heater. BACKGROUND

[0002] In the process of ironing leather or drying wet materials, high-temperature compressed air needs to be used to transfer heat to the surface of the leather or wet materials, so as to achieve rapid heating. For the leather ironing process, the heated compressed air can reduce wrinkles and creases on the surface of the leather, making the leather surface more flat and smooth. For wet materials, the heated compressed air can significantly improve the evaporation speed of water and absorb more water, thereby accelerating the drying process. Therefore, by controlling the temperature and flow of compressed air, the heating and drying processes can be accurately adjusted.

[0003] The Chinese utility model patent with publication number CN214791913U discloses a compressed air heater, which includes a shell, an electric heating pipe and a flange. The shell has an inner cavity in which the electric heating pipe is arranged. The shell is provided with a flange at one end. The shell includes a compressed air inlet, a compressed air outlet and a temperature detection port. The compressed air inlet is arranged on the top of the left end surface of the shell. The temperature detection port is arranged on the middle of the right end of the shell. The compressed air outlet is arranged on the top surface of the temperature detection port. A plurality of electric heating pipes are arranged to perform multi-stage adjustment. When the device is connected to the compressed air inlet pipe, compressed air is introduced and heated by the heating pipe to reach the required temperature. The temperature detection port is provided at the outlet to install a temperature probe to monitor the temperature of the compressed air. The temperature probe can be connected to a PLC for automatic control to achieve temperature control effect.

[0004] According to the related technology in the above, the inventors believe that the following defects exist: when the existing technology uses finned electric heating pipes to heat compressed air, local overheating easily occurs, resulting in uneven temperature distribution on the electric heating pipe, which reduces the heat transfer efficiency and thus reduces the heating efficiency of the compressed air. UTILITY MODEL CONTENT

[0005] To solve the problem of uneven temperature distribution on the electric heating pipe caused by local overheating when the existing technology uses finned electric heating pipes to heat compressed air, which reduces the heat transfer efficiency and thus reduces the heating efficiency of the compressed air, the present application provides a compressed air heater.

[0006] The compressed air heater provided by the present application adopts the following technical scheme:

[0007] The utility model provides a compressed air heater, including pressure cylinder, install the cavity in pressure cylinder, a plurality of electric heating tube are arranged in install the cavity, the spiral mounting fin is installed on the lateral wall of electric heating tube, the bottom plate is arranged on the end surface of pressure cylinder, one end of electric heating tube is installed on the bottom plate, the middle part of bottom plate is provided with air inlet pipe, the one end of air inlet pipe is located outside pressure cylinder and is provided with air inlet, the other end of air inlet pipe is inserted into install the cavity, a plurality of electric heating tube is circumferentially arranged outside air inlet pipe, the one end of electric heating tube is installed away from bottom plate and is provided with heat conduction sheet, temperature sensor for measuring the temperature in pressure cylinder is fixed on heat conduction sheet, one end of temperature sensor is connected with heat conduction sheet, the other end of temperature sensor is inserted outside pressure cylinder and exports electric signal, the one end of the air outlet pipe away from bottom plate of pressure cylinder is provided with, the air outlet pipe is connected with install the cavity, the other end of air outlet pipe is connected with control assembly.

[0008] Through the above technical scheme, compressed air enters from the air inlet, flows through the air inlet pipe and flows out from the other end of the air inlet pipe. At this time, the compressed air flows out from the middle position enclosed by the plurality of electric heating tubes. The dispersed airflow flows along the fins in the installation cavity towards the heat conduction sheet. Then, the compressed air passes through the gap between the two teeth. The compressed air is quickly heated to 150-180℃. The high-temperature compressed air flows to the air outlet pipe and flows out from the inner cavity of the air outlet pipe. At the same time, the temperature sensor can accurately measure the temperature in the pressure cylinder and transmit the electric signal to the electronic temperature controller. The temperature sensor is tightly connected with the pressure cylinder, which can also maintain the sealing of the inner container and keep the pressure in the cylinder unchanged. The fins can increase the heat dissipation area, so that the energy can be quickly transferred to the surrounding air. The use of heat conduction sheet and electric heating tube can uniformly transfer heat to the entire heating area, avoiding local overheating problems and improving the heating efficiency of compressed air. The control assembly can control the on-off of high-temperature compressed air.

[0009] Optionally, the control assembly includes an elbow pipe arranged at one end of the air outlet pipe, and an electromagnetic valve arranged at the end of the elbow pipe away from the air outlet pipe. The electromagnetic valve can be in communication with the elbow pipe, and the elbow pipe is in communication with the air outlet pipe.

[0010] Through the above technical scheme, the high-temperature compressed air heated in the pressure cylinder is output from the air outlet pipe, flows through the elbow pipe and then passes through the electromagnetic valve. When the electromagnetic coil is energized, the magnetic field generated will attract the valve core to move, thereby opening or closing the valve seat passage, and further controlling the flow of high-temperature compressed air. The setting of the elbow pipe optimizes the airflow direction, which can effectively disperse the impact force of the fluid and reduce the impact on the internal part of the electromagnetic valve, prolonging the service life of the electromagnetic valve.

[0011] Optionally, the air inlet pipe is arranged in a 90-degree elbow.

[0012] By adopting the above technical scheme, the 90-degree elbow of the air inlet pipe optimizes the air flow direction, so that the compressed air enters the installation cavity more uniformly for heating, thereby improving the heating efficiency.

[0013] Optionally, a plurality of first holes are arranged on the side wall of one end of the installation cavity in a circumferential direction, a second hole is arranged on the end face of the air inlet pipe close to the heat-conducting sheet, and the first hole and the second hole have the same hole diameter.

[0014] By adopting the above technical scheme, the first hole and the second hole are arranged to make the air flow uniformly and quickly flow out from multiple directions on the air inlet pipe, thereby improving the heat exchange efficiency.

[0015] Optionally, a plurality of toothed sheets are arranged on the outer side of the heat-conducting sheet in a circumferential direction.

[0016] By adopting the above technical scheme, when in use, the high-temperature compressed air passing through the electric heating pipe passes through the toothed sheet, so that the air can be heated to the required temperature more quickly, and the arrangement of the toothed sheet increases the contact area of the compressed air and the heat-conducting sheet, thereby improving the heating efficiency of the compressed air.

[0017] Optionally, an over-temperature protector is arranged on the outer side wall of the pressure cylinder.

[0018] By adopting the above technical scheme, when the temperature exceeds 300°C, the over-temperature protector works and disconnects the power supply of all electric heating pipes, effectively preventing the electric heating pipe from continuously heating due to temperature out of control, reducing the damage failure of the electric heating pipe, and avoiding accidents.

[0019] Optionally, a top cover is fixed to one end of the pressure cylinder away from the bottom plate, and the top cover is arranged in a hemispherical shape.

[0020] By adopting the above technical scheme, the hemispherical arrangement optimizes the structural strength of the pressure cylinder, reduces stress concentration, and makes the pressure cylinder itself have the functions of pressure resistance and sealing.

[0021] Optionally, a heat preservation layer is arranged on the outer side of the pressure cylinder.

[0022] By adopting the above technical scheme, the arrangement of the heat preservation layer can reduce the loss of heat from the inside of the pressure cylinder to the outside environment, reduce heat loss, help to maintain the stability of the internal temperature of the pressure cylinder, and thereby improve the thermal efficiency.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The compressed air enters from the air inlet, flows through the air inlet pipe and flows out from the other end of the air inlet pipe. At this time, the compressed air flows out from the middle position enclosed by the electric heating pipes. The dispersed air flow flows along the fins in the installation cavity towards the direction close to the heat conducting sheet, and then the compressed air passes through the gap between the two tooth pieces. The compressed air is quickly heated to 150-180℃. The high-temperature compressed air then flows to the air outlet pipe and flows out from the inner cavity of the air outlet pipe. At the same time, the temperature sensor can accurately measure the temperature in the pressure cylinder and transmit the electric signal to the electronic temperature controller. The temperature sensor is tightly connected with the pressure cylinder, which can also maintain the sealing of the inner container, so that the pressure in the cylinder remains unchanged. The fins can increase the heat dissipation area, so that the energy can be quickly transferred to the surrounding air. The use of heat conducting sheet and electric heating pipe can uniformly transfer heat to the entire heating area, avoid local overheating problem, and improve the heating efficiency of compressed air. The control assembly can control the on-off of high-temperature compressed air.

[0025] 2. The high-temperature compressed air heated in the pressure cylinder is output from the air outlet pipe, first flows through the elbow pipe and then passes through the electromagnetic valve. When the electromagnetic coil is energized, the magnetic field generated will attract the valve core to move, thereby opening or closing the valve seat passage, and then controlling the flow of high-temperature compressed air. The setting of the elbow pipe optimizes the airflow direction, which can effectively disperse the impact force of the fluid and reduce the impact on the inside of the electromagnetic valve, prolonging the service life of the electromagnetic valve.

[0026] 3. The 90-degree elbow of the air inlet pipe optimizes the airflow direction, so that the compressed air enters the installation cavity more uniformly for heating, improving the heating efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0028] Figure 1 is the overall structure schematic diagram of the compressed air heater of the embodiment of the present application.

[0029] Figure 2 is the internal structure schematic diagram of the compressed air heater of the embodiment of the present application.

[0030] Figure 3 is the exploded view of the compressed air heater of the embodiment of the present application.

[0031] Figure 4 is the structure schematic diagram of the first hole and the second hole in the embodiment of the present application.

[0032] Mark No. : 1, pressure cylinder; 2, installation cavity; 3, bottom plate; 4, air inlet pipe; 5, air inlet; 6, electric heating pipe; 7, fin; 8, heat conduction sheet; 9, temperature sensor; 10, air outlet pipe; 11, control assembly; 12, elbow pipe; 13, electromagnetic valve; 14, first hole; 15, second hole; 16, toothed sheet; 17, over-temperature protector; 18, top cover; 19, thermal insulation layer. DETAILED DESCRIPTION

[0033] The following will be described in detail in combination with the accompanying drawings. Figures 1-4 The application is further described in detail.

[0034] The application discloses a compressed air heater.

[0035] Referring to Figure 1 and Figure 3 , the compressed air heater comprises a pressure cylinder 1, an installation cavity 2 is formed in the pressure cylinder 1, the pressure cylinder 1 is made of stainless steel welding, and a top cover 18 is fixed to one end of the pressure cylinder 1 away from a bottom plate 3, the top cover 18 is in a hemispherical shape, which optimizes the structural strength of the pressure cylinder 1, reduces stress concentration, and makes the pressure cylinder 1 have pressure resistance and sealing functions. In order to reduce the heat loss of the pressure cylinder 1 to the external environment and reduce the heat loss, a thermal insulation layer 19 is arranged on the outside of the pressure cylinder 1, which helps to maintain the stability of the internal temperature of the pressure cylinder 1, thereby improving the thermal efficiency.

[0036] Referring to Figure 1 and Figure 3 , one end of the pressure cylinder 1 is provided with the bottom plate 3, the middle of the bottom plate 3 is provided with the air inlet pipe 4, one end of the air inlet pipe 4 located outside the pressure cylinder 1 is provided with the air inlet 5, and the other end of the air inlet pipe 4 extends into the installation cavity 2. In order to make the compressed air more uniformly enter the installation cavity 2 for heating, the air inlet pipe 4 is provided with a 90-degree elbow in the embodiment, which optimizes the airflow direction and improves the heating efficiency. A plurality of electric heating pipes 6 are arranged on the bottom plate 3, and six electric heating pipes 6 are arranged in the embodiment. One end of the electric heating pipe 6 is fixedly installed along the circumference of the bottom plate 3, and the side wall of the electric heating pipe 6 is spirally provided with the fin 7. The six electric heating pipes 6 are circumferentially arranged outside the air inlet pipe 4. When the electric heating pipe 6 is heated, the fin 7 can increase the heat dissipation area, so that the heat can be more quickly transferred to the surrounding air.

[0037] Referring to Figure 2In order to solve the problem of uneven temperature distribution caused by local overheating of the electric heating pipe 6, thereby reducing the heat transfer efficiency, the heat conduction sheet 8 is installed at one end of the electric heating pipe 6 away from the bottom plate 3. The heat conduction sheet 8 is made of high-thermal-conductivity aluminum alloy. The heat conduction sheet 8 can uniformly distribute heat to a larger area, avoiding local overheating. In order to increase the contact area between the heat conduction sheet 8 and the compressed air, a plurality of toothed plates 16 are arranged on the outer side of the heat conduction sheet 8 in the circumferential direction. When in use, the high-temperature compressed air passing through the electric heating pipe 6 passes through the toothed plates 16, so that the air can be heated to the required temperature more quickly. When ironing various leathers or drying various wet materials, the 2.5bar-3bar compressed air is quickly heated to 150-180℃ and then output.

[0038] Referring to Figure 1 and Figure 3 A temperature sensor 9 is fixed on the heat conduction sheet 8 for measuring the temperature in the pressure cylinder 1. One end of the temperature sensor 9 is threadedly connected with the heat conduction sheet 8, and the other end of the temperature sensor 9 extends out of the pressure cylinder 1 and outputs an electric signal. The electric signal is transmitted to an electronic temperature controller. The temperature sensor 9 is tightly connected with the pressure cylinder 1, which can also maintain the sealing of the inner container, so that the pressure in the pressure cylinder 1 can be maintained at 2.5bar-3bar without leakage. In order to avoid accidents, an over-temperature protector 17 is installed on the outer side wall of the pressure cylinder 1. When the temperature exceeds 300℃, the over-temperature protector 17 works and disconnects the power supply of all electric heating pipes 6.

[0039] Referring to Figure 4 Since the compressed air enters the air inlet 5 and is then output from the other end of the air inlet pipe 4, the output efficiency is not high. Therefore, six first holes 14 are uniformly arranged on the side wall of the air inlet pipe 4, and a second hole 15 is arranged on the end face of the air inlet pipe 4. The first hole 14 and the second hole 15 have the same hole diameter, and the first hole 14 and the second hole 15 are both 1.5mm circular holes. When the compressed air is output from the air inlet pipe 4, it can flow out in different directions uniformly and quickly through the seven 1.5mm circular holes.

[0040] Referring to Figure 2 and Figure 3The one end of the pressure cylinder 1 away from the bottom plate 3 is provided with an air outlet pipe 10, one end of the air outlet pipe 10 is communicated with the installation cavity 2, the other end of the air outlet pipe 10 is connected with a control assembly 11, the control assembly 11 is used for controlling the on-off of the high-temperature compressed air, and adjusting the heating and drying process of the high-temperature compressed air, the control assembly 11 comprises an elbow pipe 12 and an electromagnetic valve 13, the elbow pipe 12 is installed at one end of the air outlet pipe 10 and is communicated with the air outlet pipe 10, the elbow pipe 12 is arranged at 90 degrees, the elbow pipe 12 can effectively disperse the impact force of the fluid, and optimize the airflow direction, the electromagnetic valve 13 is installed at one end of the elbow pipe 12 away from the air outlet pipe 10, and the valve seat of the electromagnetic valve 13 can be communicated with the elbow pipe 12, the high-temperature compressed air heated in the pressure cylinder 1 is output from the air outlet pipe 10, flows through the elbow pipe 12 first and then passes through the electromagnetic valve 13, when the electromagnetic coil is electrified, the magnetic field generated will attract the valve core to move, so as to open or close the valve seat passage.

[0041] The implementation principle of the compressed air heater in the embodiment of the application is as follows: when the compressed air needs to be heated, the electric heating pipe 6 is electrified, the temperature inside the pressure cylinder 1 is monitored through the temperature sensor 9, the compressed air enters from the air inlet 5, flows through the air inlet pipe 4 and then flows out from the first hole 14 and the second hole 15 quickly, and flows upward along the length direction of the electric heating pipe 6 spirally, at this time, the temperature of the cold compressed air is rising constantly, when the compressed air flows to the heat-conducting sheet 8, the compressed air passes through the gap between the two tooth sheets 16 quickly, and can be heated to the required temperature more quickly, at this time, the compressed air is the required high-temperature compressed air, the high-temperature compressed air flows to the air outlet pipe 10 and the elbow pipe 12, and then flows to the electromagnetic valve 13, the electromagnetic valve 13 can control the on-off of the high-temperature compressed air, when the temperature inside the pressure cylinder 1 exceeds 300 DEG C, the over-temperature protector 17 will disconnect the power supply of the electric heating pipe 6, so that the electric heating pipe 6 cannot continuously heat in the case of temperature out of control.

[0042] Unless otherwise defined, technical or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the terms "first", "second", "third" and like terms used in the description and the claims of the present application do not indicate any order, quantity, or importance, but are used to distinguish different components. The terms "one" or "a" or like terms do not indicate a quantity limitation, but mean that there is at least one. The terms "include" or "contain" or like terms mean that the elements or objects before the "include" or "contain" cover the elements or objects listed after the "include" or "contain" and their equivalents, and do not exclude other elements or objects. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0043] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A compressed air heater, comprising a pressure cylinder (1), wherein an installation cavity (2) is provided inside the pressure cylinder (1), and a plurality of electric heating tubes (6) are disposed in the installation cavity (2), wherein fins (7) are spirally mounted on the sidewalls of the electric heating tubes (6), a base plate (3) is provided on the end face of the pressure cylinder (1), one end of the electric heating tubes (6) is mounted on the base plate (3), an air inlet pipe (4) is provided in the middle of the base plate (3), an air inlet (5) is provided at one end of the air inlet pipe (4) located outside the pressure cylinder (1), and the other end of the air inlet pipe (4) extends into the installation cavity (2), wherein a plurality of the electric heating tubes (6) are circumferentially disposed outside the air inlet pipe (4), characterized in that: A heat-conducting plate (8) is installed on one end of the electric heating tube (6) away from the base plate (3). A temperature sensor (9) for measuring the temperature inside the pressure cylinder (1) is fixed on the heat-conducting plate (8). One end of the temperature sensor (9) is threadedly connected to the heat-conducting plate (8), and the other end of the temperature sensor (9) extends out of the pressure cylinder (1) and outputs an electrical signal. An air outlet pipe (10) is provided on one end of the pressure cylinder (1) away from the base plate (3). One end of the air outlet pipe (10) is connected to the mounting cavity (2), and the other end of the air outlet pipe (10) is connected to a control component (11).

2. A compressed air heater according to claim 1, characterized in that: The control component (11) includes an elbow pipe (12) disposed at one end of the air outlet pipe (10) and a solenoid valve (13) disposed at the end of the elbow pipe (12) away from the air outlet pipe (10). The solenoid valve (13) can be connected to the elbow pipe (12), and the elbow pipe (12) is connected to the air outlet pipe (10).

3. A compressed air heater according to claim 1, characterized in that: The air intake pipe (4) is set with a 90-degree bend.

4. A compressed air heater according to claim 3, characterized in that: The air inlet pipe (4) has several first holes (14) circumferentially opened on the side wall of one end of the mounting cavity (2). The air inlet pipe (4) has a second hole (15) opened on the end face of one end near the heat-conducting plate (8). The first holes (14) and the second holes (15) have the same diameter.

5. A compressed air heater according to claim 1, characterized in that: The heat-conducting plate (8) has several toothed plates (16) arranged on its outer circumferential direction.

6. A compressed air heater according to claim 1, characterized in that: An over-temperature protector (17) is installed on the outer wall of the pressure cylinder (1).

7. A compressed air heater according to claim 6, characterized in that: The pressure cylinder (1) has a top cover (18) fixed at one end away from the bottom plate (3), and the top cover (18) is hemispherical.

8. A compressed air heater according to claim 7, characterized in that: The pressure cylinder (1) is provided with an insulation layer (19) on its outer side.

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