Closed waste gas collecting device

Abstract

The utility model provides a closed waste gas collecting device which comprises a first connecting pipe, a fan, a second connecting pipe, a third connecting pipe and a processing tank which are detachably and fixedly connected with a plant wall, the opening end of the first connecting pipe is communicated with an air inlet of the fan, and an air outlet of the fan is communicated with an air inlet of the second connecting pipe. According to the closed type waste gas collecting device, waste gas generated by fermentation enters the first connecting pipe, sequentially enters the second connecting pipe, the third connecting pipe and the treatment tank and is exhausted through the exhaust pipe, the inner diameter of the joint of the second connecting pipe and the third connecting pipe is gradually reduced, and therefore the waste gas can be effectively collected. After the waste gas enters the treatment tank, the inner diameter of the treatment tank is far larger than that of the third connecting pipe, the cross sectional area is greatly increased, the gas flow rate is reduced, and the waste gas treatment effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to feed production technical field, concretely relates to a closed exhaust gas collecting device. BACKGROUND

[0002] The exhaust gas produced in the feed fermentation process usually contains organic matters (such as alcohol, acid, ketone, etc.), ammonia, sulfide, etc. These exhaust gases not only have a bad smell, but also can cause harm to human health and the surrounding environment.

[0003] In order to avoid the harm of the exhaust gas produced in the fermentation process to human health and the surrounding environment, in the prior art, the exhaust gas produced in the fermentation process is collected by an exhaust gas collecting device, and relevant technical means, such as adsorption and absorption, are provided in the exhaust gas collecting device to remove or convert the pollutants in the exhaust gas into harmless substances, so as to achieve the purpose of purifying the exhaust gas and ensure that the exhaust gas meets the national emission standard before being discharged to the external environment.

[0004] However, the existing exhaust gas collecting device has the problem that the gas flow rate is too fast, which makes the exhaust gas and the treatment agent cannot fully contact and react, reducing the exhaust gas treatment effect. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a closed exhaust gas collecting device, which comprises a first connecting pipe, a fan, a second connecting pipe, a third connecting pipe and a treatment tank which are detachably fixedly connected with the wall of a factory building. The open end of the first connecting pipe is in communication with the air inlet of the fan, the air outlet of the fan is in communication with the air inlet of the second connecting pipe, the air outlet end of the second connecting pipe is in communication with the air inlet of the third connecting pipe, the air outlet of the third connecting pipe is in communication with the air inlet of the treatment tank through a pipeline, the top of the treatment tank is integrally provided with an exhaust pipe which is in communication with the inner cavity of the treatment tank, the inner diameter of one end of the second connecting pipe close to the third connecting pipe is smaller than the inner diameter of the other end of the second connecting pipe away from the third connecting pipe, and the inner diameter of one end of the third connecting pipe close to the second connecting pipe is smaller than the inner diameter of the other end of the third connecting pipe away from the second connecting pipe.

[0006] In order to achieve the above-mentioned purpose, the fan provides power, so that the exhaust gas produced in the fermentation process enters the first connecting pipe, and then enters the second connecting pipe, the third connecting pipe and the treatment tank in sequence, and is discharged through the exhaust pipe. Since the inner diameter of the connection part of the second connecting pipe and the third connecting pipe gradually decreases, that is, the cross-sectional area of the pipeline decreases, the gas flow rate increases, the rate of the exhaust gas entering the treatment tank is improved, and after the exhaust gas enters the treatment tank, the inner diameter of the treatment tank is much larger than the inner diameter of the third connecting pipe, the cross-sectional area is greatly increased, the gas flow rate is reduced, and the exhaust gas treatment effect is improved.

[0007] Further, the treatment tank is provided with a treatment assembly on the side thereof for the washing liquid to enter the treatment tank and contact the exhaust gas in the treatment tank.

[0008] By the above technical scheme, the treatment assembly is arranged beside the treatment tank, so that the washing liquid containing microorganisms is contacted with the waste gas, the microorganisms absorb and metabolize the organic substances in the waste gas, the harmful substances in the waste gas are degraded, and the waste gas treatment efficiency is improved.

[0009] Further, the treatment assembly comprises a discharge pipe arranged at the bottom of the treatment tank and integrally formed with the treatment tank, the discharge pipe is communicated with the inner cavity of the treatment tank, a sedimentation tank is communicated with the far end of the discharge pipe away from the treatment tank, a drainage pipe is integrally arranged on the outer wall of the sedimentation tank and communicated with the inner cavity of the sedimentation tank, a water supplement tank is communicated with the far end of the drainage pipe away from the sedimentation tank, a water outlet of the water supplement tank is communicated with a water pump, a water inlet of the water pump is communicated with a water filling pipe, the far end of the water filling pipe away from the water pump is fixed with the second connecting pipe and the connection position of the second connecting pipe, and the inner cavity of the water filling pipe is communicated with the second connecting pipe and the third connecting pipe.

[0010] By the above technical scheme, the washing liquid in the water supplement tank is driven into the water filling pipe by the water pump, the inner diameter of the connection position of the second connecting pipe and the third connecting pipe gradually decreases, the flow rate increases, and the static pressure decreases, so that the pressure difference is generated before and after the contraction section of the second connecting pipe and the third connecting pipe, and the washing liquid in the water filling pipe is driven to enter the treatment tank through the third connecting pipe along with the waste gas.

[0011] Further, a plurality of fourth connecting pipes are fixed on the circumferential outer wall of the first connecting pipe and communicated with the inner cavity of the first connecting pipe, and the plurality of fourth connecting pipes are arrayed along the length direction of the first connecting pipe, the inner cavity of the fourth connecting pipe is hollow, and both ends of the fourth connecting pipe are open.

[0012] By the above technical scheme, the waste gas in each fermentation barrel enters the first connecting pipe through the fourth connecting pipe, and the treatment efficiency of the waste gas is improved.

[0013] Further, the far end of the fourth connecting pipe away from the first connecting pipe is detachably fixedly connected with a corrugated pipe with a hollow inner cavity and open at both ends through a flange, and a fifth connecting pipe communicated with the exhaust pipe of the fermentation tank is detachably connected with the far end of the corrugated pipe away from the fourth connecting pipe through a flange.

[0014] By the above technical scheme, the inner cavity of the fermentation barrel, the fifth connecting pipe, the corrugated pipe, the fourth connecting pipe, the first connecting pipe, the second connecting pipe, the third connecting pipe, the water filling pipe and the treatment tank are communicated with each other, so that the sealed exhaust is realized, and the gas generated by the fermentation barrel is prevented from being directly discharged to the factory area to cause the deterioration of the environmental air quality.

[0015] Further, the top end and the bottom end of the corrugated pipe are detachably fixedly connected through a clamping assembly.

[0016] Through the technical scheme, the corrugated pipe with the wavy shape has good flexibility and plasticity, facilitating workers to connect fermentation tanks at any position, and when the device is not used, the corrugated pipe is retracted, and the top and bottom of the corrugated pipe are connected through the clamping assembly, facilitating storage of the corrugated pipe, and the corrugated pipe and the fifth connecting pipe do not affect the work of operators.

[0017] Further, the clamping assembly comprises a clamping sleeve which is coaxially fixed outside the corrugated pipe and has a tapered cross section, a plurality of through holes are formed in the circumferential outer wall of the clamping sleeve, a connecting plate is integrated at the top of each through hole, a wedge-shaped clamping head is integrated at the bottom end of the connecting plate, the wedge-shaped clamping heads are arranged in an array around the center line of the clamping sleeve, the wedge-shaped clamping head and the connecting plate are elastic, a limiting sleeve is coaxially fixed at the bottom end of the corrugated pipe, the limiting sleeve has a tapered cross section which is matched with the clamping sleeve, a plurality of wedge-shaped clamping grooves which are matched with the wedge-shaped clamping heads are uniformly formed in the circumferential outer wall of the limiting sleeve, and the wedge-shaped clamping heads and the wedge-shaped clamping grooves are in one-to-one correspondence, and the clamping sleeve and the limiting sleeve are clamped and connected through the wedge-shaped clamping heads and the wedge-shaped clamping grooves.

[0018] Through the technical scheme, when the corrugated pipe is not used, the corrugated pipe is retracted, the limiting sleeve is nested outside the clamping sleeve, the wedge-shaped clamping head is not in contact with the wedge-shaped clamping groove, the connecting plate and the wedge-shaped clamping head are pressed into the clamping sleeve, the wedge-shaped clamping head is in contact with the wedge-shaped clamping groove, and the connecting plate rebounds to drive the connecting plate and the wedge-shaped clamping head into the wedge-shaped clamping groove.

[0019] In summary, the closed waste gas collecting device has the following beneficial effects:

[0020] (1) The closed waste gas collecting device provides power through the fan, so that the waste gas generated by fermentation enters the first connecting pipe, and then enters the second connecting pipe, the third connecting pipe and the treatment tank, and is discharged through the exhaust pipe. Since the inner diameter of the connection between the second connecting pipe and the third connecting pipe gradually decreases, the cross-sectional area of the pipeline decreases, the gas flow rate increases, the rate of waste gas entering the treatment tank is improved, and after the waste gas enters the treatment tank, the inner diameter of the treatment tank is much larger than the inner diameter of the third connecting pipe, the cross-sectional area is greatly increased, the gas flow rate is reduced, and the waste gas treatment effect is improved.

[0021] (2) The closed waste gas collecting device provides power through the water pump, so that the scrubbing liquid in the water supply tank enters the water filling pipe. Since the inner diameter of the connection between the second connecting pipe and the third connecting pipe gradually decreases, the flow rate increases, and the static pressure decreases, a pressure difference is generated before and after the contraction section of the second connecting pipe and the third connecting pipe, so that the scrubbing liquid in the water filling pipe is driven to enter the treatment tank through the third connecting pipe along with the waste gas.

[0022] (3) The closed exhaust gas collecting device, the fermentation barrel inner cavity, the fifth connecting pipe, the corrugated pipe, the fourth connecting pipe, the first connecting pipe, the second connecting pipe, the third connecting pipe, the water filling pipe and the treatment tank are communicated with each other, sealed exhaust is realized, and the gas generated by the fermentation barrel is prevented from being directly discharged to the factory area to cause the deterioration of the environmental air quality. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further described and explained in combination with the drawings.

[0024] Figure 1 It is the whole structure schematic diagram of the preferred embodiment of the utility model;

[0025] Figure 2 It is the structure schematic diagram for embodying the corrugated pipe of the utility model;

[0026] Figure 3 It is the whole structure schematic diagram of the preferred embodiment of the utility model; Figure 2 The enlarged structure schematic diagram of A place in it;

[0027] Figure 4 It is the whole structure schematic diagram of the preferred embodiment of the utility model; Figure 2 The enlarged structure schematic diagram of B place in it;

[0028] Figure 5 It is the whole structure schematic diagram of the preferred embodiment of the utility model; Figure 2 The enlarged structure schematic diagram of C place in it.

[0029] Sign significance: 1, first connecting pipe;2, fan;3, second connecting pipe;4, third connecting pipe;5, treatment tank;6, exhaust pipe;7, discharge pipe;8, sedimentation tank;9, drain pipe;10, water replenishing tank;11, water pump;12, water filling pipe;13, fourth connecting pipe;14, corrugated pipe;15, fifth connecting pipe;16, clamping sleeve;17, through hole;18, connecting plate;19, wedge-shaped clamping head;20, limit sleeve;21, wedge-shaped clamping groove. DETAILED DESCRIPTION

[0030] The technical scheme of the utility model will be more clearly and completely explained in combination with the drawings and the description of the preferred embodiment of the utility model.

[0031] As Figures 1-5As shown, the utility model discloses a closed waste gas collecting device of first preferred embodiment, including with the workshop wall detachable fixed connection's first connecting pipe 1, first connecting pipe 1 horizontal arrangement, first connecting pipe 1 inner cavity is hollow, the circumference outer wall of first connecting pipe 1 is fixed with several fourth connecting pipe 13 that communicates with the inner cavity of first connecting pipe 1, several fourth connecting pipe 13 along the long side direction of first connecting pipe 1 array formula arrangement, fourth connecting pipe 13 inner cavity is hollow, both ends are open, the end of fourth connecting pipe 13 away from first connecting pipe 1 is through flange detachable fixed connection inner cavity hollow, both ends are open corrugated pipe 14, the end of corrugated pipe 14 away from fourth connecting pipe 13 is through flange detachable connection with the fifth connecting pipe 15 that communicates with fermenter exhaust pipe 6, fifth connecting pipe 15 inner cavity is hollow, both ends are open.

[0032] As Figure 1 And Figure 2 The end of fifth connecting pipe 15 away from corrugated pipe 14 is fixedly connected with the exhaust port of fermenting barrel or fermenting bag and is communicated with each other, fifth connecting pipe 15, corrugated pipe 14, fourth connecting pipe 13, first connecting pipe 1 are fixedly connected and communicated with each other, realize sealed exhaust, the waste gas discharged by fermenting barrel or fermenting bag directly passes through fifth connecting pipe 15, corrugated pipe 14, fourth connecting pipe 13 and enters first connecting pipe 1, prevent the gas generated by fermenting barrel from being directly discharged to the factory area to cause the deterioration of environmental air quality, and simultaneously, by arranging corrugated pipe 14, the corrugated pipe 14 with wavy shape has good flexibility and plasticity, so as to facilitate the connection of fermenting barrel or fermenting bag at any position, and the utilization rate of the device is improved.

[0033] As Figure 1 And Figure 2 When fifth connecting pipe 15 and corrugated pipe 14 are not used, in order to avoid that fifth connecting pipe 15 and corrugated pipe 14 are suspended on the wall and affect the work of operating personnel, the top end and the bottom end of corrugated pipe 14 are detachably fixedly connected through a clamping assembly, when the device is not used, the corrugated pipe 14 is retracted, and the top and the bottom of the corrugated pipe 14 are connected through the clamping assembly, so that the corrugated pipe 14 is conveniently stored, the corrugated pipe 14 and fifth connecting pipe 15 do not affect the work of operating personnel, when being stored, a sealing cover for closing the bottom opening part of fifth connecting pipe 15 is threadedly connected to fifth connecting pipe 15.

[0034] As Figure 3 And Figure 4 And Figure 5The clamping assembly comprises a clamping sleeve 16 nested outside the bellows 14 and coaxially fixed with the top end of the bellows 14, the clamping sleeve 16 is inversely conical in cross section, a plurality of through holes 17 are formed through the circumferential outer wall of the clamping sleeve 16, each through hole 17 is integrally provided with a connecting plate 18 at the top, the bottom end of the connecting plate 18 is integrally provided with a wedge-shaped clamping head 19, the wedge-shaped clamping heads 19 are arranged in an array with the center line of the clamping sleeve 16 as the center, the wedge-shaped clamping head 19 and the connecting plate 18 are elastic, the bottom end of the bellows 14 is coaxially fixed with a limiting sleeve 20, the limiting sleeve 20 is inversely conical in cross section and is adapted to the clamping sleeve 16, the circumferential outer wall of the limiting sleeve 20 is uniformly provided with wedge-shaped clamping grooves 21 adapted to the wedge-shaped clamping heads 19, the wedge-shaped clamping heads 19 and the wedge-shaped clamping grooves 21 correspond to each other, and the clamping sleeve 16 and the limiting sleeve 20 are clamped and connected through the wedge-shaped clamping heads 19 and the wedge-shaped clamping grooves 21.

[0035] As Figure 3 and Figure 4 and Figure 5 When the bellows 14 is not used, the bellows 14 is contracted, so that the limiting sleeve 20 is nested outside the clamping sleeve 16, the circumferential outer wall of the clamping sleeve 16 is attached to the inner wall of the limiting sleeve 20, the wedge-shaped clamping head 19 is not in contact with the wedge-shaped clamping groove 21, the connecting plate 18 and the wedge-shaped clamping head 19 are pressed into the clamping sleeve 16, the wedge-shaped clamping head 19 is in contact with the wedge-shaped clamping groove 21, the connecting plate 18 rebounds, and drives the connecting plate 18 and the wedge-shaped clamping head 19 into the wedge-shaped clamping groove 21, so as to realize clamping and fixing.

[0036] As Figure 1 As Figure 3 and Figure 4 and Figure 5 Further comprising a fan 2, a second connecting pipe 3, a third connecting pipe 4 and a treatment tank 5, one end of the first connecting pipe 1 is closed and the other end is open, the second connecting pipe 3 and the third connecting pipe 4 are hollow in the inner cavity and open at both ends, the treatment tank 5 is hollow in the inner cavity, the open end of the first connecting pipe 1 is in communication with the air inlet of the fan 2, the air outlet of the fan 2 is in communication with the air inlet of the second connecting pipe 3, the air outlet end of the second connecting pipe 3 is in communication with the air inlet of the third connecting pipe 4, and the air outlet of the third connecting pipe 4 is in communication with the air inlet of the treatment tank 5 through a pipeline, the top of the treatment tank 5 is integrally provided with an exhaust pipe 6 in communication with the inner cavity of the treatment tank 5, the inner diameter of the end of the second connecting pipe 3 close to the third connecting pipe 4 is smaller than the inner diameter of the end of the second connecting pipe 3 away from the third connecting pipe 4, the inner diameter of the end of the third connecting pipe 4 close to the second connecting pipe 3 is smaller than the inner diameter of the end of the third connecting pipe 4 away from the second connecting pipe 3, and the treatment tank 5 is fixed with an activated carbon filter layer for adsorbing exhaust gas at the middle position of the treatment tank 5.

[0037] As Figure 1, the fan 2 provides power, so that the exhaust gas into the first connecting pipe 1 into the second connecting pipe 3, third connecting pipe 4 and processing tank 5 in turn, after the activated carbon filter layer through the exhaust pipe 6, because the second connecting pipe 3 and the third connecting pipe 4 connecting place inner diameter gradually reduces, that is, the pipeline cross section area decreases, the gas flow rate increases, improve the rate of exhaust gas into the processing tank 5, after the exhaust gas into the processing tank 5, the inner diameter of the processing tank 5 is far greater than the inner diameter of the third connecting pipe 4, the cross section area increases greatly, reduce the gas flow rate, improve the exhaust gas treatment effect.

[0038] As Figure 1 , in order to further improve the treatment effect of exhaust gas, the processing tank 5 side is provided with processing assembly for washing liquid into the processing tank 5 and contact with the exhaust gas into the processing tank 5, by setting processing assembly in the processing tank 5 side, so that the washing liquid containing microorganism and exhaust gas contact, microorganism absorption and metabolism of organic matter in the exhaust gas, degradation of harmful substances in the exhaust gas, improve the exhaust gas treatment efficiency.

[0039] As Figure 1 , the processing assembly includes the discharge pipe 7 arranged at the bottom of the processing tank 5 and integrated with the processing tank 5, the inner cavity of the discharge pipe 7 is hollow, the two ends are open, the discharge pipe 7 is communicated with the inner cavity of the processing tank 5, the end of the discharge pipe 7 away from the processing tank 5 is communicated with the inner cavity of the sedimentation tank 8, the outer wall of the sedimentation tank 8 is integrated with the drain pipe 9 communicated with the inner cavity of the sedimentation tank 8, the end of the drain pipe 9 away from the sedimentation tank 8 is communicated with the water supply tank 10, the water outlet of the water supply tank 10 is communicated with the water pump 11, the water outlet of the water pump 11 is communicated with the water inlet of the water filling pipe 12, the end of the water filling pipe 12 away from the water pump 11 is fixed with the second connecting pipe 3 and the second connecting pipe 3 connecting position, the inner cavity of the water filling pipe 12 is communicated with the second connecting pipe 3 and the third connecting pipe 4.

[0040] As Figure 1 Figure 1 , the water pump 11 provides power, so that the washing liquid in the water supply tank 10 into the water filling pipe 12, because the second connecting pipe 3 and the third connecting pipe 4 connecting place inner diameter gradually reduces, the flow rate increases, the static pressure decreases, thereby generating pressure difference before and after the contraction section of the second connecting pipe 3 and the third connecting pipe 4, driving the washing liquid in the water filling pipe 12 into the processing tank 5 with the exhaust gas through the third connecting pipe 4.

[0041] The above specific embodiments only describe the preferred embodiments of the present application, and do not limit the protection scope of the present application. Without departing from the design concept and spirit of the present application, those skilled in the art can make various modifications, substitutions and improvements to the technical scheme of the present application according to the description and drawings provided by the present application, which should belong to the protection scope of the present application. The protection scope of the present application is determined by the claims.

Claims

1. A closed-loop waste gas collection device, characterized in that, The system includes a first connecting pipe (1) that is detachably and fixedly connected to the wall of the factory, a fan (2), a second connecting pipe (3), a third connecting pipe (4), and a treatment tank (5). The open end of the first connecting pipe (1) is connected to the air inlet of the fan (2). The air outlet of the fan (2) is connected to the air inlet of the second connecting pipe (3). The air outlet of the second connecting pipe (3) is connected to the air inlet of the third connecting pipe (4). The air outlet of the third connecting pipe (4) is connected to the air inlet of the treatment tank (5) through a pipeline. The top of the treatment tank (5) is integrally equipped with an exhaust pipe (6) that is connected to the inner cavity of the treatment tank (5). The inner diameter of the end of the second connecting pipe (3) near the third connecting pipe (4) is smaller than the inner diameter of the end of the second connecting pipe (3) away from the third connecting pipe (4). The inner diameter of the end of the third connecting pipe (4) near the second connecting pipe (3) is smaller than the inner diameter of the end of the third connecting pipe (4) away from the second connecting pipe (3).

2. The closed-loop waste gas collection device according to claim 1, characterized in that, A treatment component is provided on the side of the treatment tank (5) to allow the washing liquid to enter the treatment tank (5) and come into contact with the exhaust gas entering the treatment tank (5).

3. The closed-loop waste gas collection device according to claim 2, characterized in that, The processing assembly includes a discharge pipe (7) integrally formed with the bottom of the processing tank (5). The discharge pipe (7) is connected to the inner cavity of the processing tank (5). The end of the discharge pipe (7) away from the processing tank (5) is connected to a settling tank (8). The outer wall of the settling tank (8) is integrally formed with a drain pipe (9) connected to the inner cavity of the settling tank (8). The end of the drain pipe (9) away from the settling tank (8) is connected to a water replenishment tank (10). The outlet of the water replenishment tank (10) is connected to a water pump (11). The outlet of the water pump (11) is connected to the inlet of the water filling pipe (12). The end of the water filling pipe (12) away from the water pump (11) is fixedly connected to the second connecting pipe (3). The inner cavity of the water filling pipe (12) is connected to the second connecting pipe (3) and the third connecting pipe (4).

4. The closed-loop waste gas collection device according to claim 1, characterized in that, A plurality of fourth connecting pipes (13) communicating with the inner cavity of the first connecting pipe (1) are fixed on the outer circumference of the first connecting pipe (1). The plurality of fourth connecting pipes (13) are arranged in an array along the long side of the first connecting pipe (1). The inner cavity of the fourth connecting pipe (13) is hollow and open at both ends.

5. A closed-loop waste gas collection device according to claim 4, characterized in that, The fourth connecting pipe (13) is detachably fixed to a hollow, open-end corrugated pipe (14) at one end away from the first connecting pipe (1) via a flange. The corrugated pipe (14) is detachably connected to a fifth connecting pipe (15) that communicates with the fermenter exhaust pipe (6) at one end away from the fourth connecting pipe (13) via a flange.

6. A closed-loop waste gas collection device according to claim 5, characterized in that, The top and bottom ends of the bellows (14) are detachably fixedly connected by a snap-fit ​​assembly.

7. A closed-loop waste gas collection device according to claim 6, characterized in that, The snap-fit ​​assembly includes a snap-fit ​​sleeve (16) nested outside the corrugated pipe (14) and coaxially fixed with the top end of the corrugated pipe (14). The snap-fit ​​sleeve (16) has a conical cross-section. The outer circumferential wall of the snap-fit ​​sleeve (16) has several through holes (17). Each through hole (17) has a connecting plate (18) integrated at the top of its groove. The bottom end of the connecting plate (18) has a wedge-shaped snap head (19). Several wedge-shaped snap heads (19) are arranged in an array with the center line of the snap-fit ​​sleeve (16) as the center. The wedge-shaped snap heads (19) and the connecting plate (18) are elastic. The bottom end of the corrugated pipe (14) is coaxially fixed with a limiting sleeve (20). The cross section of the limiting sleeve (20) is conical and adapted to the snap-fit ​​sleeve (16). The outer circumference of the limiting sleeve (20) is uniformly provided with wedge-shaped slots (21) adapted to the wedge-shaped snap heads (19). Several wedge-shaped snap heads (19) correspond one-to-one with the wedge-shaped slots (21). The snap-fit ​​sleeve (16) and the limiting sleeve (20) are tightly connected by the wedge-shaped snap heads (19) and the wedge-shaped slots (21).

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