An experimental device for measuring the oxygen production rate of aquatic plant photosynthesis

Abstract

The application belongs to the technical field of photosynthesis intensity measurement, and provides an experimental device for measuring oxygen production rate of aquatic plant photosynthesis. The application comprises a water storage tank and aquatic plants. A partition plate is horizontally arranged in the water storage tank. The partition plate is provided with vertical gas through holes. A first elastic body is arranged in the partition plate. The aquatic plants are arranged on both sides of the partition plate and are fixed to the partition plate. An oscillation mechanism is arranged below the water storage tank. The application enables the aquatic plants to be in a suitable photosynthesis growth environment, thereby increasing the overall oxygen production rate of the experimental device and quickly completing the measurement of photosynthesis oxygen. The application supplements the light conditions of the experimental environment of the experimental device, reasonably increases the light according to the needs of the aquatic plants, saves the energy consumption of the supplemental light, avoids the accumulation of gas in the leaf gap of the aquatic plants and the attachment of bubbles on the surface of the aquatic plants, and improves the oxygen collection efficiency of the experimental device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photosynthesis intensity determination, and provides an experimental device for determining oxygen production rate of photosynthesis of aquatic plants. BACKGROUND

[0002] Since the average photosynthesis rate of aquatic plants in the natural environment is low, the efficiency of oxygen production in the experimental process of determining the photosynthesis oxygen of aquatic plants is low, and due to the gas tightness of the device and the oxygen adhering to the surface of the aquatic plants, the collection efficiency of the oxygen produced by the photosynthesis of the aquatic plants is low. Therefore, the success rate of the experiment for determining the photosynthesis oxygen of aquatic plants is low in a short time. The prior art KR100548784B1 photosynthesis determination experimental device is provided with a beaker heating holder on one side of the machine body, the beaker heating holder can be observed through the fixed observation window in the fixed support, the light source is adjusted according to the light intensity in the measurement experimental device, the light source is connected with the beaker heating holder at the center of the beaker, the tube krypton lamp with horizontal distance in the horizontal direction is fixed on the support, the lamp holder exhaust fan with the same distance as the horizontal distance of the krypton lamp is arranged at the bottom of the sensor, the lamp holder exhaust fan is used for releasing heat in the lamp holder, a heat sensor, a photometer panel of the device body, a display and a photometer range adjuster are coupled with the lamp holder, and the area where the beaker heating holder and the beaker are located is separated by a glass table plate. The prior art uses a large number of sensors, and the cost is high. The inventor believes that there is a large space for improvement of the prior art. SUMMARY

[0003] The present application aims to make aquatic plants in a suitable photosynthesis growth environment, thereby increasing the overall oxygen production rate of the experimental device, and quickly completing the determination of photosynthesis oxygen. Secondly, the light conditions of the experimental environment of the experimental device are supplemented, the light is reasonably increased according to the needs of aquatic plants, the photosynthesis efficiency of aquatic plants is improved, and the energy consumption of the supplemental light is saved; the water body and aquatic plants in the experimental device are oscillated, the gas accumulated in the leaf gap of aquatic plants and the bubbles attached to the surface of aquatic plants are avoided, and the oxygen collection efficiency of the experimental device is improved. To this end, the present application provides an experimental device for determining the photosynthesis oxygen production rate of aquatic plants, which comprises a water storage tank and aquatic plants, the water storage tank is provided with a partition plate transversely inside, the partition plate is provided with a vertical gas through hole, the partition plate is provided with a first elastic body inside, the aquatic plants are arranged on both sides of the partition plate, the aquatic plants are fixed to the partition plate, and an oscillation mechanism is arranged below the water storage tank. The partition plate is used to separate the aquatic plants according to the principle of ecological community stratification, so that the aquatic plants are in a suitable photosynthesis growth environment, and the space utilization rate of the water storage tank is improved, thereby increasing the overall oxygen production efficiency of the aquatic plants and the overall oxygen production speed of the experimental device, quickly collecting sufficient oxygen, and completing the determination of photosynthesis oxygen; the oscillation mechanism is used to oscillate the water body and aquatic plants in the experimental device in cooperation with the partition plate provided with the first elastic body. Since the partition plate is provided with the first elastic body, the partition plate has a different vibration frequency from the water body, the aquatic plants fixed on the surface of the partition plate can be shaken, the gas accumulated in the leaf gap of the aquatic plants and the bubbles attached to the surface of the aquatic plants can be avoided, the oxygen produced by all the aquatic plants in the experimental device can be fully collected, and the oxygen collection efficiency of the experimental device is improved; the aquatic plants are fixed on both sides of the partition plate, the aquatic plants can be arranged in order, the light irradiation of each other is avoided, the light irradiation for photosynthesis can be fully utilized, the photosynthesis efficiency of the aquatic plants is improved, and the utilization efficiency of the light of the experimental environment is improved.

[0004] As preferred, the experimental device further comprises a light supplementing box, the water storage tank is located in the light supplementing box, and the inner surface of the light supplementing box is provided with mirror paper and at least two light sources. The mirror paper is used to reflect the light generated by the light source, so that the aquatic plants can be irradiated by sufficient light, and the photosynthesis rate of the aquatic plants is improved; the multiple light sources are used to irradiate the water storage tank, so that the aquatic plants in the water storage tank can receive light irradiation from multiple angles, the area of the aquatic plants receiving light irradiation is increased, and the overall oxygen production rate of the experimental environment is improved.

[0005] As preferred, the light sources are arranged in vertical direction with interval, the density of the light sources in the upper half of the light supplement box is greater than that in the lower half of the light supplement box. The light sources are arranged in vertical direction with interval, so that the light in the experimental device is distributed in gradient, the aquatic plants near the top of the light supplement box can receive stronger light, and the aquatic plants near the bottom of the light supplement box can receive weaker light. Since the light intensity at which the photosynthesis efficiency of different types of aquatic plants is maximum is different, the above arrangement can make the photosynthesis of each type of aquatic plant close to the maximum, thereby improving the oxygen generation efficiency of the aquatic plants in the experimental device.

[0006] As preferred, the oscillation mechanism comprises a second elastic body and a rotating device, one end of the second elastic body abuts against the bottom of the water storage tank, the other end of the second elastic body abuts against the rotating device, the second elastic body is located at the center of the rotating device, and the rotating device is in contact with the bottom of the water storage tank. Under the action of the rotating device and the second elastic body, the experimental device will oscillate with small amplitude, the water in the water storage tank will oscillate, and the aquatic plants fixed on the partition plate will oscillate relative to the water due to the different inertias of the water and the partition plate with the second elastic body. The gas in the gap between the leaves of the aquatic plants and the bubbles adhered to the surface of the leaves can escape, thereby improving the absorption efficiency of the experimental device for the bubbles generated by the photosynthesis of the aquatic plants.

[0007] As preferred, the top of the water storage tank is provided with a gas collector and a water inlet pipe, the connection between the gas collector and the water storage tank is provided with a filter plate with holes, the water inlet pipe penetrates through the partition plate, and the end of the water inlet pipe is located at the bottom of the water storage tank. The filter plate with holes is arranged at the connection between the gas collector and the water storage tank, so as to prevent impurities in the water storage tank from entering the gas collector, and at the same time, micro bubbles can be generated when oxygen passes through the filter plate, thereby facilitating the observation of the oxygen generation rate. One end of the water inlet pipe is located at the bottom of the water storage tank, and the other end is connected to a water source outside the experimental device. The oxygen generated by the aquatic plants in the experimental device is squeezed into the gas collection device by pumping new water, thereby facilitating the quantitative analysis of the oxygen generated by the aquatic plants.

[0008] As preferred, the side of the water storage tank is provided with an observation window, and the field of view of the observation window includes the connection between the gas collector and the water storage tank. The observation window can facilitate the qualitative observation of the oxygen generated by the aquatic plants in the water storage tank, which is conducive to the judgment of the air tightness of the water storage tank by the experimental personnel, so that the experiment can be carried out normally.

[0009] As preferred, the partition plate comprises a first partition plate, the first partition plate is located in the upper half of the water storage tank, the aquatic plants comprise floating plants, the first partition plate separates the gas collector and the floating plants, and the floating plants are fixed at the bottom of the first partition plate. According to the ecological community stratification principle, the floating plants with high light demand at the maximum photosynthesis rate are fixed in the upper half of the water storage tank, so as to improve the photosynthesis rate of the floating plants. Further, the floating plants are orderly fixed, so as to avoid mutual shading of the floating plants, and the photosynthesis rate of the floating plants is improved.

[0010] As preferred, the partition plate further comprises a second partition plate, the second partition plate is located in the lower half of the water storage tank, and the aquatic plants further comprise submerged plants. The second partition plate separates the submerged plants and the floating plants. The second partition plate isolates the submerged plants with low light demand at the maximum photosynthesis rate in the lower half of the water storage tank, so as to improve the photosynthesis rate of the submerged plants. Further, the submerged plants are orderly fixed, so as to avoid mutual shading of the submerged plants, and the photosynthesis rate of the submerged plants is improved.

[0011] As preferred, the gas collector comprises a filter pipe, and the filter pipe is provided with sealing clamps at both ends. The filter pipe is arranged in the gas collector to filter part of the gas and water vapor in the gas collector except oxygen, so as to improve the purity and dryness of the collected oxygen, improve the accuracy of quantitative measurement of the oxygen volume and subsequent experiments, and further observe whether a small water column is generated at the gas collection pipe through the observation window to determine whether the gas in the water storage tank is fully discharged. The sealing clamp at the end of the filter pipe close to the water storage tank is a water stop clamp, so as to avoid too much water in the water storage tank from entering the gas collector. The sealing clamp at the end of the filter pipe away from the water storage tank is a spring clamp, which is used to control whether the gas in the filter pipe is discharged.

[0012] The application provides an experimental device for measuring oxygen production rate of aquatic plants, which fuses the principle of ecological community stratification, so that the aquatic plants can be in a suitable photosynthesis growth environment, thereby increasing the overall oxygen production speed of the experimental device and quickly completing the measurement of photosynthesis oxygen; the light conditions of the experimental environment where the experimental device is located are supplemented, the light is reasonably increased according to the needs of the aquatic plants, the photosynthesis efficiency of the aquatic plants is improved, and the energy consumption of the supplemental light is saved; the gas accumulated in the leaf gaps of the aquatic plants and the bubbles attached to the surface of the aquatic plants are avoided for the water body and the aquatic plants in the experimental device, the oxygen collection efficiency of the experimental device is improved, and the following beneficial effects are achieved: the aquatic plants are separated according to the principle of ecological community stratification by using the separation plate, so that the aquatic plants are in a suitable photosynthesis growth environment, the space utilization rate of the water storage tank is improved, the overall oxygen production efficiency of the aquatic plants and the overall oxygen production speed of the experimental device are increased, sufficient oxygen is quickly collected, and the measurement of photosynthesis oxygen is completed; the separation plate has a different vibration frequency from the water body, can shake the aquatic plants fixed on the surface of the separation plate, avoid the gas accumulated in the leaf gaps of the aquatic plants and the bubbles attached to the surface of the aquatic plants, can fully collect the oxygen produced by all the aquatic plants in the experimental device, and improve the oxygen collection efficiency of the experimental device; the aquatic plants are fixed on both sides of the separation plate, the aquatic plants can be arranged in order, avoid mutual shading of light irradiation, can fully utilize the light for photosynthesis, improve the efficiency of photosynthesis of the aquatic plants, and improve the utilization efficiency of the light of the experimental environment. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0014] Figure 1 It is a structural schematic diagram of the experimental device of the application;

[0015] Figure 2 It is a sectional structural schematic diagram of the experimental device of the application;

[0016] Figure 3 It is a structural schematic diagram of the gas collector of the application;

[0017] Figure 4 It is a sectional structural schematic diagram of the oscillation device at N of the application;

[0018] Figure 5 It is a sectional structural schematic diagram of the separation plate at M of the application.

[0019] Explanation of reference numerals in the attached drawings: 1. Observation window; 2. Supplemental lighting box; 3. Water tank; 4. First partition plate; 5. Second partition plate; 501. Gas passage; 502. Covering plate; 503. First elastic body; 6. Oscillating mechanism; 601. Second elastic body; 602. Rotating device; 7. Light source; 8. Gas collector; 801. Gas hose; 802. Spring clamp; 803. Filter tube; 804. Water stop clamp; 805. Sealing plug; 806. Filter plate; 9. Water inlet pipe. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Example 1

[0022] like Figure 1 As shown, an experimental apparatus for determining the oxygen production rate of aquatic plants through photosynthesis includes a water tank 3 and aquatic plants. An observation window 1 is provided on the side of the water tank 3, and the field of view of the observation window 1 includes the connection point between the gas collector 8 and the water tank 3. The observation window 1 facilitates qualitative observation of the oxygen production being carried out by the aquatic plants inside the water tank 3, and helps the experimenter determine the airtightness of the water tank 3, ensuring the normal conduct of the experiment.

[0023] Combination Figure 2 and Figure 5 As shown, the water tank 3 has a horizontally arranged partition plate inside, with vertical gas vents 501. A first elastic body 503 is located inside the partition plate, and covering plates 502 are located on both sides of the first elastic body 503. Aquatic plants are arranged on both sides of the partition plate and fixed to it. An oscillation mechanism 6 is located below the water tank 3. The partition plate separates the aquatic plants according to the principle of ecological community stratification, ensuring the aquatic plants are in a suitable photosynthetic growth environment and improving the space utilization rate inside the water tank 3. This increases the overall oxygen production efficiency of the aquatic plants and the overall oxygen production speed of the experimental device, rapidly collecting sufficient oxygen to complete the measurement of photosynthetic oxygen. The oscillation mechanism 6 is used in conjunction with... The partition plate of the first elastic body 503 vibrates the water and aquatic plants inside the experimental device. Because the partition plate is equipped with the first elastic body 503, the partition plate has a different vibration frequency than the water, which can shake the aquatic plants fixed on the surface of the partition plate. This prevents gas from accumulating between the leaves of the aquatic plants and prevents air bubbles from adhering to the surface of the aquatic plants. It can fully collect the oxygen produced by all the aquatic plants inside the experimental device, thereby improving the oxygen collection efficiency of the experimental device. The aquatic plants are fixed on both sides of the partition plate, and the aquatic plants can be arranged in an orderly manner to avoid blocking each other's light. This allows them to make full use of light for photosynthesis, improving the efficiency of photosynthesis of the aquatic plants and the utilization efficiency of light in the experimental environment.

[0024] The experimental device further comprises a light supplementing box 2, the water storage box 3 is located inside the light supplementing box 2, and the inner surface of the light supplementing box 2 is provided with mirror paper and at least two light sources 7. The mirror paper is used for reflecting the light generated by the light source 7, so that the aquatic plants can be irradiated by sufficient light source 7, and the photosynthesis rate of the aquatic plants is improved; the water storage box 3 is irradiated by multiple light sources 7, so that the aquatic plants in the water storage box 3 can receive light source 7 irradiation from multiple angles, the area of the aquatic plants receiving light source 7 irradiation is increased, and the overall oxygen production rate of the experimental environment is improved.

[0025] As shown in Figure 2 , the light sources 7 are arranged at intervals in the vertical direction, and the density of the light sources 7 in the upper half of the light supplementing box 2 is greater than that in the lower half of the light supplementing box 2. The light sources 7 are arranged at intervals in the vertical direction, so that the light in the experimental device is distributed in a gradient manner, so that the aquatic plants close to the top of the light supplementing box 2 can receive relatively strong light, and the aquatic plants close to the bottom of the light supplementing box 2 can receive relatively weak light. Since the light intensity at which the photosynthesis efficiency of different types of aquatic plants is maximum is different, the above arrangement can make the photosynthesis of each type of aquatic plant close to the maximum value, thereby improving the oxygen production efficiency of the aquatic plants in the experimental device.

[0026] As shown in Figure 4 , the oscillation mechanism 6 comprises a second elastic body 601 and a rotating device 602, one end of the second elastic body 601 abuts against the bottom of the water storage box 3, the other end of the second elastic body 601 abuts against the rotating device 602, the second elastic body 601 is located at the center position of the rotating device 602, and the rotating device 602 is in contact with the bottom of the water storage box 3. Under the action of the rotating device 602 and the second elastic body 601, the experimental device will oscillate slightly, the water in the water storage box 3 will oscillate, and the aquatic plants fixed on the partition plate will oscillate relative to the water due to the different inertias of the water and the partition plate with the second elastic body 601. The gas in the gap between the leaves of the aquatic plants and the bubbles adhered to the surface of the leaves can escape, thereby improving the absorption efficiency of the experimental device for the bubbles generated by the photosynthesis of the aquatic plants.

[0027] As shown in Figure 1 and Figure 3 , the top of the water storage box 3 is provided with a gas collector 8 and a water inlet pipe 9, the connection between the gas collector 8 and the water storage box 3 is provided with a filter plate 806 with holes, the water inlet pipe 9 penetrates through the partition plate, and the end of the water inlet pipe 9 is located at the bottom of the water storage box 3. The gas collector 8 comprises a gas hose 801, a filter pipe 803 and a sealing plug 805, the gas hose 801 is connected to one end of the filter pipe 803 away from the water storage box 3, and the two ends of the filter pipe 803 are provided with sealing clamps.

[0028] The gas collector 8 is provided with a filter pipe 803 for filtering the gas in the gas collector 8 except oxygen and water vapor, improving the purity and dryness of the collected oxygen, and improving the accuracy of quantitative measurement of the volume of oxygen and subsequent experiments. Secondly, a small water column can be generated at the gas collection pipe, and the sealing clamp at one end of the filter pipe 803 is a water stop clamp 804 to prevent too much water in the water storage tank 3 from entering the gas collector 8, and to determine whether the gas in the water storage tank 3 is fully discharged. The sealing clamp at the other end of the filter pipe 803 is a spring clamp 802 for clamping the gas hose 801 to control whether the gas in the filter pipe 803 is discharged. The connection between the gas collector 8 and the water storage tank 3 is provided with a filter plate 806 with holes and a sealing plug 805 to prevent impurities in the water storage tank 3 from entering the gas collector 8, and to generate small bubbles when oxygen passes through the filter plate 806, facilitating observation of the oxygen generation rate. One end of the water inlet pipe 9 is located at the bottom of the water storage tank 3, and the other end is connected to an external water source. The pump is used to pump new water to squeeze the oxygen generated by the aquatic plants in the experimental device into the gas collection device, facilitating quantitative analysis of the oxygen generated by the aquatic plants.

[0029] As shown in Figure 2 The separation plate includes a first separation plate 4 located in the upper half of the water storage tank 3, and the aquatic plants include floating plants. The first separation plate 4 separates the gas collector 8 and the floating plants, and the floating plants are fixed at the bottom of the first separation plate 4. The separation plate also includes a second separation plate 5 located in the lower half of the water storage tank 3, and the aquatic plants also include submerged plants. The second separation plate 5 separates the submerged plants and the floating plants.

[0030] Through the above arrangement, the ecological community stratification principle is adopted. The floating plants with high light demand at the maximum photosynthesis rate are fixed in the upper half of the water storage tank 3 to improve the photosynthesis rate of the floating plants. Further, the floating plants are orderly fixed to avoid mutual shading of light radiation between the floating plants, thereby improving the photosynthesis rate of the floating plants. The second separation plate 5 separates the submerged plants with low light demand at the maximum photosynthesis rate in the lower half of the water storage tank 3 to improve the photosynthesis rate of the submerged plants. Further, the submerged plants are orderly fixed to avoid mutual shading of light radiation between the submerged plants, thereby improving the photosynthesis rate of the submerged plants.

[0031] The application provides an experimental device for measuring oxygen production rate of aquatic plants, which fuses the principle of ecological community stratification, so that the aquatic plants can be in a suitable photosynthesis growth environment, thereby increasing the overall oxygen production rate of the experimental device and quickly completing the measurement of photosynthesis oxygen; the light conditions of the experimental environment of the experimental device are supplemented, the light is reasonably increased according to the needs of the aquatic plants, the photosynthesis efficiency of the aquatic plants is improved, and the energy consumption of the supplemental light is saved; the water body and the aquatic plants in the experimental device are oscillated, so that the gas accumulated in the leaf gaps of the aquatic plants and the bubbles attached to the surface of the aquatic plants are avoided, the oxygen collection efficiency of the experimental device is improved, and the following beneficial effects are achieved: the aquatic plants are separated according to the principle of ecological community stratification by the separation plate, so that the aquatic plants are in a suitable photosynthesis growth environment, the space utilization rate in the water storage tank 3 is improved, the overall oxygen production efficiency of the aquatic plants and the overall oxygen production rate of the experimental device are increased, sufficient oxygen is quickly collected, and the measurement of photosynthesis oxygen is completed; the separation plate has a different vibration frequency from the water body, can shake the aquatic plants fixed on the surface of the separation plate, avoid the gas accumulated in the leaf gaps of the aquatic plants and the bubbles attached to the surface of the aquatic plants, can fully collect the oxygen produced by all the aquatic plants in the experimental device, and improve the oxygen collection efficiency of the experimental device; the aquatic plants are fixed on the two sides of the separation plate, the aquatic plants can be arranged in order, the light irradiation is avoided, the light can be fully utilized for photosynthesis, the efficiency of photosynthesis of the aquatic plants is improved, and the utilization efficiency of the light of the experimental environment is improved.

[0032] The above examples and / or embodiments are only used to illustrate the preferred examples and / or embodiments of the application, and do not limit the embodiments of the application in any form, and any person skilled in the art can make some changes as other equivalent examples without departing from the scope of the technical means disclosed in the application, but should be regarded as the same technology or embodiment as the application.

Claims

1. An experimental apparatus for measuring the rate of oxygen production by photosynthesis of aquatic plants, comprising a water storage tank (3) and aquatic plants, characterized in that, The water storage tank (3) is provided with a partition plate in the transverse direction, the partition plate is provided with a vertical gas through hole (501), the partition plate is provided with a first elastic body (503), both sides of the partition plate are provided with the aquatic plants, the aquatic plants are fixed to the partition plate, and the lower portion of the water storage tank (3) is provided with an oscillation mechanism (6); The experimental device further comprises a light supplementing box (2), the water storage tank (3) is located in the light supplementing box (2), and the inner surface of the light supplementing box (2) is provided with mirror paper and at least two light sources (7); The light sources (7) are arranged in the vertical direction, and the density of the light sources (7) in the upper half of the light supplementing box (2) is greater than that in the lower half of the light supplementing box (2). The water storage tank (3) is provided with a gas collector (8) and a water inlet pipe (9) at the top, the partition plate comprises a first partition plate (4), the first partition plate (4) is located in the upper half of the water storage tank (3), the aquatic plants comprise floating plants, the first partition plate (4) separates the gas collector (8) and the floating plants, and the floating plants are fixed to the bottom of the first partition plate (4). The partition plate further comprises a second partition plate (5), the second partition plate (5) is located in the lower half of the water storage tank (3), and the aquatic plants further comprise submerged plants; and the second partition plate (5) separates the submerged plants and the floating plants.

2. The experimental apparatus for determining the rate of oxygen production by photosynthesis of aquatic plants according to claim 1, wherein, The oscillation mechanism (6) comprises a second elastic body (601) and a rotating device (602), one end of the second elastic body (601) abuts against the bottom of the water storage tank (3), the other end of the second elastic body (601) abuts against the rotating device (602), the second elastic body (601) is located at the center position of the rotating device (602), and the rotating device (602) is in contact with the bottom of the water storage tank (3).

3. The experimental apparatus for determining the rate of oxygen production by photosynthesis of aquatic plants according to claim 1, wherein, The gas collector (8) is provided with a filter plate (806) with holes at the connection position of the water storage tank (3), the water inlet pipe (9) penetrates through the partition plate, and the tail end of the water inlet pipe (9) is located at the bottom of the water storage tank (3).

4. The experimental apparatus for determining the rate of oxygen evolution in photosynthesis of aquatic plants according to claim 3, wherein, The side of the water storage tank (3) is provided with an observation window (1), and the field of view of the observation window (1) comprises the connection position of the gas collector (8) and the water storage tank (3).

5. The experimental apparatus for determining the rate of oxygen evolution in photosynthesis of aquatic plants according to claim 3, wherein, The gas collector (8) comprises a filter pipe (803), and both ends of the filter pipe (803) are provided with sealing clamps.

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