Dust removal device for heat pump drying

Abstract

The utility model discloses a dust removal device for heat pump drying, which belongs to the technical field of drying devices and comprises a filter box, an air return port and an air supply port, the air return port and the air supply port are arranged on two sides of the filter box, a filter is arranged inside the filter box, the windward side of the filter faces the air return port, and the leeward side of the filter faces the air supply port. The bottom of the filter box body is provided with an ash discharge port protruding downwards, a jet pump ash discharge device is arranged below the ash discharge port, the leeside of the filter is provided with a backflushing ash removal device, the backflushing ash removal device comprises a ventilation pipeline communicated with high-pressure air, and the ventilation pipeline is connected into the filter box body from the bottom of the filter box body and communicated with a backflushing spray pipe. A plurality of air injection holes are formed in one side, facing the leeside of the filter, of the back-flushing spray pipe. The heat pump drying device is compact and reasonable in structure, solves the problems of high energy consumption and low drying efficiency in a traditional drying mode, is energy-saving and environment-friendly, is high in operation efficiency, and is suitable for being popularized and applied in the heat pump drying device.

Description

Technical Field

[0001] The utility model relates to the technical field of drying devices, in particular to a dust removal device for heat pump drying. Background Art

[0002] Air source heat pump hot air unit has the characteristics of high efficiency, energy saving and environmental protection, low drying temperature, high dehydration rate and sanitation and safety. It is a mild and natural drying method that can maximize the retention of nutrients in the material without destroying its original structure. It is widely used in the drying field. In view of the working characteristics of the fin heat exchanger of the air source heat pump hot air unit, there are certain requirements for the cleanliness of the incoming air. Otherwise, dust will accumulate on the fin heat exchanger and cause dirty blockage, which will seriously affect the heating performance of the heat pump unit.

[0003] The traditional way to reduce dust accumulation is to install primary and medium efficiency filters at the air inlet section of the heat exchanger of the air source heat pump hot air unit to filter the dust in the air inlet of the heat pump unit. The filter needs to be cleaned of dust regularly to ensure the ventilation capacity of the filter. However, frequent removal of the filter for cleaning requires a lot of manpower, and the working environment is poor, which also poses a great threat to the health of maintenance personnel. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects in the prior art and provide a dust removal device for heat pump drying, which can recoil and clean the filter screen and simultaneously extract and discharge the removed dust through an ejector pump, thereby achieving filtering, cleaning and dust discharge, ensuring the ventilation capacity of the filter screen, ensuring the heating performance of the heat pump unit and protecting the health of the staff.

[0005] The purpose of the utility model is achieved as follows: a dust removal device for heat pump drying, comprising a filter box and a return air inlet and an air supply inlet arranged on both sides of the filter box, a filter is arranged inside the filter box, the windward side of the filter faces the return air inlet, the leeward side of the filter faces the air supply inlet, a downwardly protruding ash discharge port is arranged at the bottom of the filter box, an induced pump ash discharge device is arranged below the ash discharge port, a recoil cleaning device is arranged on the leeward side of the filter, comprising a ventilation duct connected to high-pressure air, the ventilation duct is connected to the filter box from the bottom of the filter box and is connected to a recoil nozzle, the recoil nozzle is arranged opposite to the leeward side of the filter, and a plurality of jet holes are arranged on the side of the recoil nozzle facing the leeward side of the filter.

[0006] When the utility model is working, turbid return air enters the interior of the filter box through the return air port, fine dust is intercepted and filtered by the filter and adheres to the windward side of the filter, and the filtered clean air is sent back to the air source heat pump through the air supply port of the filter box for use. When the dust on the windward side of the filter accumulates to a certain amount, high-pressure air is passed into the recoil nozzle through the recoil cleaning device, and is sprayed out from the jet hole toward the leeward side of the filter at a high speed, so that the dust adhering to the filter is recoil-cleaned, and the high-pressure air enters the ejector pump nozzle of the dust cleaning pipe below the filter box through the ventilation pipe and is ejected at high speed, forming a negative pressure at the bypass pipe interface connected to the ejector pump nozzle and the ash discharge port, sucking out the high-concentration turbid air from the bypass pipe, mixing with the high-pressure airflow from the ventilation pipe, and then discharged to the ash discharge main pipe through the expansion section pipeline of the ejector pump.

[0007] Compared with the prior art, the beneficial effects of the present invention are:

[0008] First, the recoil cleaning and dust extraction of the device can be carried out simultaneously, thereby improving the dust removal and cleaning efficiency.

[0009] Second, the dust is collected in the main ash discharge pipe for unified treatment, avoiding secondary pollution caused by cleaning in the workshop and ensuring the health of the staff.

[0010] Thirdly, the dust cleaning pipes of the device are arranged in multiple groups side by side under the filter box, which occupies a small space and simplifies the space under the filter box.

[0011] Furthermore, the ejector pump ash discharge device includes a cleaning pipeline connected to the ventilation pipeline, and an ejector pump is provided in the cleaning pipeline. The inlet end of the ejector pump is connected to the ventilation pipeline, and the outlet end of the ejector pump includes a contraction section pipeline and an expansion section pipeline. The expansion section pipeline is connected to the rear end of the contraction section pipeline and is connected to the ash discharge main pipe.

[0012] Furthermore, a solenoid valve A is provided on the ventilation pipe connected to the filter box, and a solenoid valve B is provided on the ventilation pipe at the front end of the inlet end of the ejector pump.

[0013] Furthermore, a bypass pipe is connected to the ash cleaning pipeline at the outlet end of the ejector pump, the bypass pipe is communicated with the ash discharge port, and a solenoid valve C is provided on the bypass pipe.

[0014] Furthermore, the dust cleaning pipes are arranged in multiple groups side by side below the filter box.

[0015] Furthermore, a plurality of recoil nozzles are provided in parallel with the filter.

[0016] Furthermore, the filter is an F8 plate-type medium-efficiency filter, which has high filtration efficiency and can remove particles larger than 0.3 μm, and has moderate resistance, causing little resistance to the return air, thereby improving the return air dust removal filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the jet pump dust removal device for heat pump drying of the utility model.

[0018] Figure 2 It is a schematic diagram of the state of the jet pump dust removal device for heat pump drying of the utility model during filtering operation.

[0019] Figure 3 It is a schematic diagram of the state of the jet pump dust removal device for heat pump drying of the utility model during dust cleaning and dust discharge operation.

[0020] Among them, 1 is a dust removal box, 2 is a return air outlet, 3 is a supply air outlet, 4 is a recoil nozzle, 5 is an air injection hole, 6 is a filter, 7 is a solenoid valve A, 8 is a solenoid valve B, 9 is a solenoid valve C, 10 is an ejector pump, 11 is a contraction section pipeline, 12 is an expansion section pipeline, 13 is a bypass pipe, 14 is an ash discharge port, and 15 is a ventilation pipe. DETAILED DESCRIPTION

[0021] like Figure 1 A dust removal device for heat pump drying shown in the figure comprises a filter box body 1 and a return air port 2 and an air supply port 3 arranged on both sides of the filter box body 1, a filter 6 is arranged inside the filter box body 1, the windward side of the filter 6 faces the return air port 2, and the leeward side of the filter 6 faces the air supply port 3, a downwardly protruding ash discharge port 14 is arranged at the bottom of the filter box body 1, an ash discharge device of an ejector pump is arranged below the ash discharge port 14, and a recoil cleaning device is arranged on the leeward side of the filter 6, including a ventilation duct 15 connected to high-pressure air, the ventilation duct 15 is connected to the filter box body 1 from the bottom of the filter box body 1 and is connected to a recoil nozzle 4, the recoil nozzle 4 is arranged opposite to the leeward side of the filter 6, and a plurality of jet holes 5 are arranged on the side of the recoil nozzle 4 facing the leeward side of the filter 6.

[0022] The ejector pump ash discharge device includes an ash cleaning pipeline connected to the ventilation pipeline 15, in which an ejector pump 10 is arranged, the inlet end of the ejector pump 10 is connected to the ventilation pipeline 15, the outlet end of the ejector pump 10 includes a contraction section pipeline 11 and an expansion section pipeline 12, the expansion section pipeline 12 is connected to the rear end of the contraction section pipeline 11 and is connected to the ash discharge main pipe.

[0023] A solenoid valve A 7 is provided on the ventilation pipe 15 connected to the filter box 1 , and a solenoid valve B 8 is provided on the ventilation pipe 15 at the front end of the inlet end of the ejector pump 10 .

[0024] A bypass pipe 13 is connected to the ash cleaning pipeline at the outlet end of the ejector pump 10 . The bypass pipe 13 is communicated with the ash discharge port 14 . A solenoid valve C 9 is provided on the bypass pipe 13 .

[0025] A plurality of dust removal pipes are arranged side by side below the filter box 1 .

[0026] A plurality of recoil nozzles 4 are arranged parallel to the filter.

[0027] Filter 6 is an F8 plate-type medium-efficiency filter, which has high filtration efficiency and can remove particles larger than 0.3 μm. It also has moderate resistance and creates little resistance to the return air, thereby improving the return air dust removal filtration efficiency.

[0028] When the utility model is working, the turbid return air enters the interior of the filter box 1 through the return air port 2, the fine dust is intercepted and filtered by the filter 6, and adheres to the windward surface of the filter 6, and the clean air after filtering is sent back to the air source heat pump through the air supply port 3 of the filter box 1 for use. Figure 2 As shown, at this time, the solenoid valve A 7 and the solenoid valve B 8 are both in the closed state; when the dust on the windward side of the filter 6 accumulates to a certain amount, such as Figure 3 As shown, the electromagnetic valve A7, the electromagnetic valve B8 and the electromagnetic valve C9 are all opened and in the conducting state, and the high-pressure air passing through the electromagnetic valve A7 is transported to the recoil nozzle 4 in the filter box 1 through the ventilation pipe 15, and is ejected at high speed toward the leeward side of the filter 6 through the air jet 5 on the recoil nozzle 4, so that the dust adhering to the filter 6 is recoiled and removed. After a period of recoil cleaning, the ventilation effect of the filter 6 can be ensured; the high-pressure air passing through the electromagnetic valve B8 enters the nozzle of the induced pump 10 and is ejected at high speed, and a negative pressure is formed at the interface of the bypass pipe 13 connecting the nozzle of the induced pump 10 and the ash discharge port 14, so that the high-concentration turbid air passing through the electromagnetic valve C9 is sucked out, and after mixing with the high-pressure airflow passing through the electromagnetic valve B8, it is discharged to the ash discharge main pipe through the expansion section pipeline 12 of the induced pump 10; recoil cleaning and dust extraction can be carried out simultaneously. After the cleaning is completed, the electromagnetic valve A7 is closed first, and the electromagnetic valve B8 and the electromagnetic valve C 9 are closed at the same time after a certain delay, thereby realizing a filtering, cleaning and dust discharge cycle. The ejector dust removal device of the utility model is compact and reasonable, which solves the problems of difficult cleaning and easy secondary pollution in the return air dust removal of traditional heat pump drying, has high operating efficiency and good cleaning and dust removal effect, and has good practicality. In addition, in actual operation, the ejector pump 10 structural dimensions, cleaning frequency, cleaning time, delay time of solenoid valve B 8 and solenoid valve C 9, and parameters such as pressure and flow of high-pressure air can be calculated according to the return air volume and dust concentration, and can be used in heat pump drying systems of different specifications.

[0029] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A dust removal device for heat pump drying, comprising a filter box and a return air inlet and an air supply inlet arranged on both sides of the filter box, characterized in that: A filter is provided inside the filter box, with the windward side of the filter facing the return air port, and the leeward side of the filter facing the air supply port. A downwardly protruding ash discharge port is provided at the bottom of the filter box, and an ejector pump ash discharge device is provided below the ash discharge port. A recoil cleaning device is provided on the leeward side of the filter, including a ventilation duct connected to high-pressure air, the ventilation duct is connected to the filter box from the bottom of the filter box and is connected to a recoil nozzle, the recoil nozzle is arranged opposite to the leeward side of the filter, and a plurality of jet holes are provided on the side of the recoil nozzle facing the leeward side of the filter.

2. A dust removal device for heat pump drying according to claim 1, characterized in that: The ejector pump ash discharge device includes an ash cleaning pipeline connected to the ventilation pipeline, an ejector pump is arranged in the ash cleaning pipeline, the inlet end of the ejector pump is connected to the ventilation pipeline, the outlet end of the ejector pump includes a contraction section pipeline and an expansion section pipeline, the expansion section pipeline is connected to the rear end of the contraction section pipeline and is connected to the ash discharge main pipe.

3. A dust removal device for heat pump drying according to claim 2, characterized in that: A solenoid valve A is provided on the ventilation pipe connected to the filter box, and a solenoid valve B is provided on the ventilation pipe at the front end of the inlet end of the ejector pump.

4. A dust removal device for heat pump drying according to claim 2, characterized in that: A bypass pipe is connected to the ash cleaning pipeline at the outlet end of the ejector pump, the bypass pipe is communicated with the ash discharge port, and a solenoid valve C is provided on the bypass pipe.

5. A dust removal device for heat pump drying according to claim 2, characterized in that: The dust cleaning pipes are arranged in multiple groups side by side below the filter box.

6. A dust removal device for heat pump drying according to claim 1, characterized in that: A plurality of recoil nozzles are arranged parallel to the filter.

7. A dust removal device for heat pump drying according to claim 6, characterized in that: The filter is an F8 plate-type medium-efficiency filter.

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