Electric heater for gas heating

Abstract

The utility model relates to an electric heater for gas heating, which belongs to the technical field of electric heaters and comprises an air duct type electric heater main body, a gas filter box body, a gas inlet pipe, a gas outlet pipe, a first sealing door, a mounting plate, a filter screen cylinder, a cleaning rod and a dust collection box. And the gas exhaust pipe, the air duct type electric heater main body, the gas filtering box body and the gas inlet pipe are communicated in sequence. The electric heater used for gas heating is provided with the filter screen cylinder of the arc-shaped structure, introduced air can be filtered, dust and impurities can be prevented from being attached to the electric heating pipe of the electric heater to affect the heat exchange efficiency, the pressure difference sensors are arranged at the two ends of the filter structure, and the pressure difference can be detected in front of and behind the filter screen. When the pressure difference is large, the electric cleaning structure can be started in time to clean the filter screen cylinder, the air passing rate of the electric heater is guaranteed, filtered dust and impurities can be cleaned without dismantling the filter structure, and maintenance work can be more convenient.

Description

An electric heater for heating gas Technical Field

[0001] This utility model relates to the field of electric heater technology, and in particular to an electric heater for heating gas. Background Technology

[0002] Electric heaters can convert electrical energy into heat energy to heat gases. They are widely used in industries, laboratories, HVAC, and other fields. The working principle is that current passes through a resistance wire (such as nickel-chromium alloy) to generate heat, which heats the gas through heat conduction or radiation. To prevent dust and impurities in the gas from adhering to the electric heating tube and affecting the heat exchange efficiency, the incoming air usually needs to be filtered.

[0003] A search revealed that Chinese patent CN202223046972.3 discloses a dual-junction box electric heater for gas heating. In use, gas is introduced through the inlet pipe and flows downwards into the heater body. First, the gas exits from the bottom of the inlet pipe and passes through a primary filter, which removes most dust and impurities. Then, it passes through a high-efficiency filter for a second round of filtration, intercepting finer dust and impurities. The combined effect of the primary and high-efficiency filters... This device achieves the effect of gas filtration, removing dust from the gas and preventing dust from adhering to the inside of the electric heater body. The filtration effect is good. When in use, by pulling the ring rod on the outer surface of the fixing block outward, the fixing block moves the limiting rod outward and slides out from the limiting hole. At this time, both the primary filter and the high-efficiency filter lose their limiting position, and the primary filter and the high-efficiency filter can be pulled, making it convenient for staff to clean. Furthermore, by sliding the L-shaped block out from the L-shaped groove, the primary filter and the high-efficiency filter can be separated, making cleaning even more convenient.

[0004] The above-mentioned technical solution has the following drawbacks. Although such an electric heater structure can filter the incoming air through a filter screen to prevent dust from adhering to the electric heating tube and affecting the heat exchange efficiency, in actual use, there is a lack of detection methods, making it inconvenient to determine the appropriate time to clean the filter screen. Moreover, cleaning requires disassembling and reassembling the filter screen structure of the electric heater, making maintenance work relatively laborious. To prevent dust from adhering to the electric heating tube and affecting the heat exchange efficiency of the electric heater, and to facilitate timely cleaning of filtered dust, an electric heater for gas heating is proposed. This heater is equipped with an arc-shaped filter screen cylinder to filter the incoming air, thereby preventing dust and impurities from adhering to the electric heating tube and affecting the heat exchange efficiency. Differential pressure sensors are installed at both ends of the filter structure to detect the pressure difference before and after the filter screen. When the pressure difference is large, the electric cleaning structure can be activated in time to clean the filter screen cylinder. The filtered dust and impurities can be cleaned without removing the filter structure, making maintenance work more convenient.

[0005] In view of this, this work improves and solves the above problems. Through dedicated research and application of theoretical principles, a technical solution with a reasonable design that can effectively improve the above defects has finally been proposed.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the general background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] This invention provides an electric heater for gas heating, which solves the problems mentioned in the background. Differential pressure sensors are set at both ends of the filter structure to detect the pressure difference before and after the filter screen. When the pressure difference is large, the electric cleaning structure is activated to clean the filter screen cylinder. The filter dust and impurities can be cleaned without removing the filter structure, making maintenance more convenient.

[0008] The solution to the above-mentioned technical problems of this utility model is as follows: An electric heater for gas heating includes a duct-type electric heater body, a gas filter box, a gas inlet pipe, a gas outlet pipe, a first sealing door, a mounting plate, a filter screen cylinder, a cleaning rod, and a dust collection box. The gas outlet pipe, the duct-type electric heater body, the gas filter box, and the gas inlet pipe are connected in sequence. The duct-type electric heater body is provided with electric heating tubes and an air heating chamber. The electric heating tubes are evenly arranged in the air heating chamber. The first sealing door is installed at the duct-type electric heater body and is evenly fixed. A partition plate is fixedly installed, and the mounting plate is threadedly connected to the filter screen cylinder. The mounting plate is installed in the gas filter box by bolts. The gas filter box is equipped with a motor protective cover, which is rotatably connected to a cleaning rod. The cleaning rod is equipped with a cleaning brush. The gas filter box is fixedly connected to an impurity discharge hopper. A drive motor is installed inside the motor protective cover, and the drive end of the drive motor is fixedly connected to the cleaning rod. The dust collection box is connected to the impurity discharge hopper by bolts. Two differential pressure sensors are provided, and the two differential pressure sensors are respectively placed on both sides of the filter screen cylinder.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the partition plate is provided with multiple staggered arrangements, and the air heating chamber is divided into S-shaped air heating channels by the partition plate. The S-shaped air heating channels formed by the staggered partition plates can effectively extend the heating time of air in the main body of the air duct electric heater, thereby ensuring the heating effect.

[0011] Furthermore, the main body of the air duct type electric heater has a slot corresponding to the partition plate, and a high-temperature resistant sealing gasket is provided in the slot, so that the partition plate can be stably placed in the main body of the air duct type electric heater for dividing the cavity.

[0012] Furthermore, the gas filter housing has a limit slot corresponding to the mounting plate. The limit slot can be connected to the mounting plate with bolts, making the mounting plate easy to disassemble and assemble, thereby allowing for maintenance and replacement of the loaded filter cylinder.

[0013] Furthermore, the motor protective cover is provided with a wiring channel, which extends out from the gas filter box, and the wiring harness of the drive motor can be passed through the wiring channel.

[0014] Furthermore, the motor protective cover is rotatably connected to the cleaning rod via a bearing, and one end of the motor protective cover is set with an arc-shaped structure. The motor protective cover can weigh the cleaning rod, thereby preventing the drive end of the drive motor from being damaged by force.

[0015] Furthermore, the outer wall of the filter cylinder is configured with an arc-shaped structure, the cleaning rod is adapted to the outer wall of the filter cylinder, and the cleaning brush is in close contact with the filter cylinder, so that the cleaning brush can clean the filter cylinder during rotation.

[0016] Furthermore, the dust collection box is equipped with casters at the bottom, and the gas filter box is equipped with a second sealing door. The dust collection box with casters is easy to move, and the second sealing door is connected to the gas filter box with screws. After removal, the internal components can be maintained.

[0017] This invention provides an electric heater for gas heating, which has the following advantages:

[0018] 1. The filter screen at the mounting plate can filter the incoming air, thereby preventing dust and impurities from adhering to the motor heat pipe and affecting the heat exchange efficiency. The air heating chamber of the duct-type electric heater body is divided into S-shaped air heating channels by partition plates, which can effectively increase the heating time and make the air fully heated.

[0019] 2. The differential pressure sensors on both sides can detect the differential pressure on both sides of the filter cylinder. When the filter cylinder is clogged, the airflow resistance increases, causing the differential pressure ΔP across the filter to rise. The initial differential pressure ΔP0 of a new filter at the rated flow rate is usually 50-100 Pa. When ΔP reaches 1.5-2 times ΔP0, it needs to be cleaned. This monitoring structure allows for timely detection of large differential pressures, enabling timely cleaning of the filter and ensuring ventilation efficiency and filter safety.

[0020] 3. Start the drive motor inside the motor protective cover to drive the cleaning rod to clean the outer wall of the filter screen cylinder. The cleaned dust and impurities can be collected in the dust collection box through the impurity discharge hopper. The dust collection box can be removed by removing the bolts connecting the impurity discharge hopper and the dust collection box, so that the dust collected inside can be treated uniformly.

[0021] 4. This type of electric heater for gas heating is equipped with an arc-shaped filter screen to filter the incoming air, thus preventing dust and impurities from adhering to the heating element and affecting heat exchange efficiency. Differential pressure sensors are installed at both ends of the filter structure to detect the pressure difference before and after the filter. When the pressure difference is large, the electric cleaning mechanism is activated in time to clean the filter screen, ensuring the air passage rate of the electric heater. Dust and impurities can be cleaned without removing the filter structure, making maintenance more convenient.

[0022] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0024] Figure 1 is a schematic diagram of the structure of an electric heater for gas heating according to an embodiment of the present invention;

[0025] Figure 2 is a front view of an electric heater for gas heating according to an embodiment of the present invention;

[0026] Figure 3 is a structural schematic diagram of the main body of an electric heater for gas heating in an embodiment of the present invention, showing the first sealing door of the duct-type electric heater in the open state.

[0027] Figure 4 is a top view of the structure of the first sealing door in an electric heater for gas heating according to an embodiment of the present invention.

[0028] Figure 5 is a schematic diagram of the arrangement of partition plates in an electric heater for gas heating according to an embodiment of the present invention.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Main body of the duct-type electric heater; 2. Gas filter box; 3. Gas inlet pipe; 4. Gas outlet pipe; 5. Electric heating element; 6. Air heating chamber; 7. No. 1 sealing door; 8. Partition plate; 9. Mounting plate; 10. Filter screen cylinder; 11. Motor protective cover; 12. Cleaning rod; 13. Cleaning brush; 14. Impurity discharge hopper; 15. Drive motor; 16. Dust collection box; 17. Differential pressure sensor; 18. No. 2 sealing door. Detailed Implementation

[0031] The principles and features of this utility model are described below with reference to Figures 1-5. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0032] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] As shown in Figures 1-5, an electric heater for gas heating includes a duct-type electric heater body 1, a gas filter box 2, a gas inlet pipe 3, a gas outlet pipe 4, a first sealing door 7, a mounting plate 9, a filter screen cylinder 10, a cleaning rod 12, and a dust collection box 16. The gas outlet pipe 4, the duct-type electric heater body 1, the gas filter box 2, and the gas inlet pipe 3 are connected in sequence. The duct-type electric heater body 1 is provided with electric heating tubes 5 and an air heating chamber 6. The electric heating tubes 5 are evenly arranged in the air heating chamber 6. The first sealing door 7 is installed at the duct-type electric heater body 1, and partitions are evenly fixedly installed on the first sealing door 7. Plate 8 and mounting plate 9 are threadedly connected to filter cylinder 10. Mounting plate 9 is installed in gas filter box 2 by bolts. Gas filter box 2 is equipped with motor protective cover 11. Motor protective cover 11 is rotatably connected to cleaning rod 12. Cleaning rod 12 is equipped with cleaning brush 13. Gas filter box 2 is fixedly connected to impurity discharge hopper 14. Drive motor 15 is installed in motor protective cover 11. Drive end of drive motor 15 is fixedly connected to cleaning rod 12. Dust collection box 16 can be connected to impurity discharge hopper 14 by bolts. Two differential pressure sensors 17 are provided. The two differential pressure sensors 17 are respectively placed on both sides of filter cylinder 10.

[0035] Preferably, the partition plate 8 is provided with multiple staggered arrangements, and the air heating chamber 6 is divided into S-shaped air heating channels by the partition plate 8. The S-shaped air heating channels formed by the staggered partition plates 8 can effectively extend the heating time of air in the air duct type electric heater body 1, thereby ensuring the heating effect.

[0036] Preferably, the duct-type electric heater body 1 has a slot corresponding to the partition plate 8, and a high-temperature resistant sealing gasket is provided in the slot, so that the partition plate 8 can be stably placed in the duct-type electric heater body 1 to divide the cavity.

[0037] Preferably, the gas filter housing 2 has a limit slot corresponding to the mounting plate 9. The limit slot can be connected to the mounting plate 9 by bolts, making the mounting plate 9 easy to disassemble and install, so as to maintain and replace the loaded filter cylinder 10.

[0038] Preferably, the motor protective cover 11 is provided with a wiring channel, which extends out from inside the gas filter box 2, and the wiring harness of the drive motor 15 can be passed out through the wiring channel.

[0039] Preferably, the motor protective cover 11 is rotatably connected to the cleaning rod 12 via a bearing, and one end of the motor protective cover 11 is set with an arc-shaped structure. The motor protective cover 11 can weigh the cleaning rod 12, thereby preventing the drive end of the drive motor 15 from being damaged by force.

[0040] Preferably, the outer wall of the filter cylinder 10 is configured with an arc-shaped structure, the cleaning rod 12 is adapted to the outer wall of the filter cylinder 10, and the cleaning brush 13 is in close contact with the filter cylinder 10. The cleaning brush 13 can clean the filter cylinder 10 during rotation.

[0041] Preferably, the dust collection box 16 is equipped with casters at the bottom, and the gas filter box 2 is equipped with a second sealing door 18. The dust collection box 16 with casters is easy to move, and the second sealing door 18 is connected to the gas filter box 2 by screws. After removal, the internal components can be maintained.

[0042] The specific working principle and usage method of this utility model are as follows: Air can be introduced into the gas filter box 2 through the gas inlet pipe 3. The filter cylinder 10 at the mounting plate 9 can filter the introduced air. The filtered air can be transmitted to the air duct type electric heater body 1. The air heating chamber 6 of the air duct type electric heater body 1 is divided into an S-shaped air heating channel by the partition plate 8. The electric heating tube 5 placed in the channel can evenly heat the air. The heated air can then be transmitted to the gas outlet pipe 4 for discharge. The differential pressure sensor 17 on both sides can detect the differential pressure on both sides of the filter cylinder 10. When the filter cylinder 10 is blocked, the airflow resistance increases. This causes the pressure difference ΔP across the filter screen to increase. The initial pressure difference ΔP0 of the new 10 at the rated flow rate is usually 50-100Pa. When ΔP reaches 1.5-2 times ΔP0, cleaning is performed. The drive motor 15 inside the motor protective cover 11 can drive the cleaning rod 12 to rotate on the outer wall of the filter screen cylinder 10. The cleaning brush 13 of the cleaning rod 12 can clean the outer wall of the filter screen cylinder 10. The dust and impurities after cleaning can be collected in the dust collection box 16 through the impurity discharge hopper 14. The dust collection box 16 can be removed by removing the bolts connecting the impurity discharge hopper 14 and the dust collection box 16, so that the dust collected inside can be treated uniformly.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. An electric heater for gas heating, comprising a duct-type electric heater body (1), a gas filter box (2), a gas inlet pipe (3), a gas outlet pipe (4), a first sealing door (7), a mounting plate (9), a filter screen cylinder (10), a cleaning rod (12), a dust collection box (16), and a differential pressure sensor (17), characterized in that: The gas exhaust pipe (4), the duct-type electric heater body (1), the gas filter box (2), and the gas inlet pipe (3) are connected in sequence. The duct-type electric heater body (1) is equipped with an electric heating tube (5) and an air heating chamber (6). The electric heating tube (5) is evenly arranged in the air heating chamber (6). The first sealing door (7) is installed at the duct-type electric heater body (1). The first sealing door (7) is evenly fixedly installed with partition plates (8). The mounting plate (9) is threadedly connected to the filter screen cylinder (10). The mounting plate (9) is installed in the gas filter box (2) by bolts. The body (2) is equipped with a motor protective cover (11), which is rotatably connected to the cleaning rod (12). The cleaning rod (12) is equipped with a cleaning brush (13). The gas filter box (2) is fixedly connected to the impurity discharge hopper (14). The motor protective cover (11) is equipped with a drive motor (15). The drive end of the drive motor (15) is fixedly connected to the cleaning rod (12). The dust collection box (16) can be connected to the impurity discharge hopper (14) by bolts. There are two differential pressure sensors (17), which are respectively placed on both sides of the filter cylinder (10).

2. An electric heater for gas heating according to claim 1, characterized in that, The partition plate (8) is provided with multiple staggered arrangements, and the air heating chamber (6) is divided into S-shaped air heating channels by the partition plate (8).

3. The electric heater for heating a gas according to claim 1, wherein The main body (1) of the air duct type electric heater has a slot corresponding to the partition plate (8), and a high temperature resistant sealing gasket is provided in the slot.

4. The electric heater for heating a gas according to claim 1, wherein The gas filter box (2) has a limit slot on the mounting plate (9), and the limit slot can be connected to the mounting plate (9) by bolts.

5. An electric heater for gas heating according to claim 1, characterized in that, The motor protective cover (11) is provided with a wiring channel, which extends out from inside the gas filter box (2).

6. The electric heater for heating a gas according to claim 1, wherein The motor protective cover (11) is rotatably connected to the cleaning rod (12) via a bearing, and one end of the motor protective cover (11) is set as an arc-shaped structure.

7. An electric heater for gas heating according to claim 1, characterized in that, The outer wall of the filter cylinder (10) is set with an arc-shaped structure, the cleaning rod (12) is adapted to the outer wall of the filter cylinder (10), and the cleaning brush (13) is tightly attached to the filter cylinder (10).

8. An electric heater for gas heating according to claim 1, characterized in that, The dust collection box (16) is equipped with casters at the bottom, and the gas filter box (2) is equipped with a second sealing door (18).

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