Flow-limiting non-return device and water outlet device

Abstract

The flow-limiting non-return device comprises a main body and a flow-limiting piece, the main body comprises a flow channel, the flow channel comprises a water inlet and a water outlet, the water passing area of the flow channel is gradually reduced in the water inlet direction, and the flow-limiting piece is arranged in the flow channel and comprises a diaphragm part and a shaft part capable of elastically deforming in the water inlet direction. The diaphragm part is arranged at the end, close to the water inlet, of the shaft part and comprises a bendable skirt edge, water flow can flow into the flow channel from the water inlet to impact the diaphragm part so that the skirt edge can be bent in the direction opposite to the water inlet, the shaft part can be deformed and compressed, the diaphragm part can move in the direction away from the water inlet, and the diaphragm part is matched with the gradually-shrunk flow channel to achieve flow limiting. When water flows into the flow channel from the water outlet, the diaphragm part can be impacted to enable the skirt edge to seal the flow channel. According to the current-limiting non-return device, the current-limiting non-return function can be achieved only through one current-limiting piece, multiple parts do not need to be used in cooperation, and the current-limiting non-return device is simple in structure and convenient and fast to assemble.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve field especially is related to a flow limiting check device and water outlet device. BACKGROUND

[0002] At present, the flow limiting check valve is often arranged in the shower, faucet and angle valve and the like to control water flow, but in some prior art, the flow limiting check valve has many parts, for example, the elastic member and the blocking member need to be matched with each other, and the O-ring needs to be used, so that the water flow can be prevented from flowing back while the flow is limited, the parts are many and the structure is complex, and the assembly process is not convenient. SUMMARY

[0003] The utility model provides a flow limiting check device and water outlet device, aims at solving the technical problem that the flow limiting check device in the prior art has many parts and a complex structure, and the assembly process is not convenient.

[0004] To achieve the above object, the first aspect embodiment of the utility model provides a flow limiting check device, which comprises:

[0005] A main body comprising a flow channel, the flow channel comprising a water inlet and a water outlet, the water area of the flow channel gradually decreasing along the water inlet direction;

[0006] A flow limiting member arranged in the flow channel, comprising a diaphragm part and a shaft part elastically deformable along the water inlet direction, wherein the diaphragm part is arranged at one end of the shaft part close to the water inlet, and the diaphragm part comprises a foldable skirt;

[0007] When the water flow flows into the flow channel from the water inlet, the diaphragm part can be impacted to make the skirt fold in the direction away from the water inlet, and at the same time, the shaft part is deformed and compressed, so that the diaphragm part moves in the direction away from the water inlet;

[0008] When the water flow flows into the flow channel from the water outlet, the diaphragm part can be impacted to make the skirt close the flow channel.

[0009] The flow limiting check device provided by the first aspect embodiment of the utility model utilizes the shaft part elastically deformable and compressible along the water inlet direction to realize the movable arrangement of the diaphragm part, and utilizes the flow channel with gradually reduced water area to cooperate with the diaphragm part, so that the actual water area decreases with the increase of water flow, and effective flow limiting is realized. At the same time, the skirt on the diaphragm part can also block the water flow flowing in the reverse direction, realize check, and only one flow limiting member can realize the flow limiting and check function, without the cooperation of multiple parts, the structure is simple, and the assembly is convenient.

[0010] According to some embodiments of the present application, the diaphragm part is in the shape of a bowl, and the opening of the diaphragm part faces away from the water inlet; when no water flows into the flow channel or water flows from the water outlet into the flow channel, the skirt abuts against the inner wall of the flow channel.

[0011] According to some embodiments of the present application, the diaphragm part comprises a connecting part and a deformation part, the skirt is connected with the connecting part through the deformation part, and the side of the connecting part facing away from the skirt is connected with the shaft part.

[0012] According to some embodiments of the present application, a water blocking ring is extended on the side of the connecting part close to the water inlet.

[0013] According to some embodiments of the present application, a cylinder part parallel to the water inlet direction is arranged in the shaft part.

[0014] According to some embodiments of the present application, the main body further comprises a rod part parallel to the water inlet direction, and the rod part is arranged in the cylinder part.

[0015] According to some embodiments of the present application, the inner wall of the cylinder part extends a sealing ring in the direction close to the water inlet; when the rod part is arranged in the cylinder part, the sealing ring abuts against the outer circumferential wall of the rod part.

[0016] According to some embodiments of the present application, at least one second annular groove is arranged on the inner circumferential wall of the cylinder part.

[0017] According to some embodiments of the present application, the main body comprises a shell and a cover, and the rod part is arranged on the end of the cover close to the shell.

[0018] The second aspect embodiment of the present application provides a water outlet device, comprising the flow limiting and reverse stopping device.

[0019] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 Fig. 1 shows the overall schematic diagram of the flow limiting and reverse stopping device provided by the embodiment of the present application;

[0022] Figure 2 Fig. 2 shows the exploded schematic diagram of the flow limiting and reverse stopping device provided by the embodiment of the present application;

[0023] Figure 3 A structure schematic view of the flow limiting member is shown;

[0024] Figure 4 A structure schematic view of the flow limiting check device is shown;

[0025] Figure 5 A structure schematic view of the flow limiting check device is shown;

[0026] Figure 6 A structure schematic view of the flow limiting check device is shown;

[0027] Reference signs:

[0028] 1000, flow limiting check device;

[0029] 100, main body; 110, cover body; 111, water inlet; 112, rod part; 120, shell; 121, flow channel; 122, baffle; 1221, water outlet; 1222, rod hole; 123, sealing groove;

[0030] 200, flow limiting member; 210, diaphragm part; 211, skirt; 212, deformation part; 213, first annular groove; 214, connecting part; 215, water retaining ring; 220, shaft part; 221, cylinder part; 222, sealing ring; 223, second annular groove;

[0031] 300, sealing ring. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0033] Reference Figure 2 and Figure 4 In some specific embodiments of the present application, a flow limiting check device 1000 is provided, which can be arranged in a water outlet device such as a shower, faucet, angle valve, etc. to limit the flow of the water outlet device and control the opening and closing of the water flow. The outer wall of the flow limiting check device 1000 can be provided with a sealing groove 123, and the sealing ring 300 can be sleeved therein to realize sealing when the flow limiting check device 1000 is installed in the water outlet device, thereby avoiding water leakage from the outer wall of the device.

[0034] Reference Figures 1-4In some specific embodiments of the utility model, provide a current -limiting check device 1000, including main part 100 and current -limiting piece 200, main part 100 includes cover 110 and shell 120, one end of shell 120 is provided with water outlet 1221, and the other end is provided as opening, cover 110 is covered on the opening to be mutually covered with shell 120, shell 120 is provided with flow channel 121, and water inlet 111 is hollowed out on cover 110, by this, after cover 110 and shell 120 are covered, water flow can enter flow channel 121 from water inlet 111 and flow from water outlet 1221. Wherein, the water area of flow channel 121 gradually decreases along the water inlet direction, that is, the inner wall of shell 120 is tapered from the end close to water inlet 111 to the end close to water outlet 1221.

[0035] Current -limiting piece 200 is arranged in flow channel 121 of shell 120, and current -limiting piece 200 includes diaphragm part 210 and shaft part 220 connected with each other, diaphragm part 210 is arranged on the end of shaft part 220 close to water inlet 111, and shaft part 220 can be elastically deformed along the water inlet direction, and bendable skirt 211 is arranged on diaphragm part 210.

[0036] By this, when water flow flows from water inlet 111 into flow channel 121, diaphragm part 210 is impacted, thus skirt 211 is bent along the direction away from water inlet 111, and water flow can pass through the space between skirt 211 and the inner wall of flow channel 121 and flow from water outlet 1221 (as Figure 5 , the water flow in the figure is shown with an arrow dotted line). Meanwhile, when water flow impacts diaphragm part 210, shaft part 220 is also impacted by the impact force of water flow, thus shaft part 220 is deformed and compressed along the direction away from water inlet 111 (as Figure 6 , the water flow in the figure is shown with an arrow dotted line), thus diaphragm part 210 is also pulled by shaft part 220 to move along the direction close to water outlet 1221, when water flow is greater, the impact force is greater, the deformation and compression degree of shaft part 220 is higher, and diaphragm part 210 is also closer to water outlet 1221, because the water area of flow channel 121 gradually decreases along the water inlet direction, thus diaphragm part 210 is closer to water outlet 1221, and the water area between skirt 211 and the inner wall of flow channel 121 is smaller, thus even if water flow is greater, the current -limiting check device 1000 of the utility model embodiment can control the flow through by the smaller water area, to realize the current -limiting function.

[0037] When water flow flows from water outlet 1221 into flow channel 121, under the impact of water flow, skirt 211 is no longer bent, but is opened and tightly attached to the inner wall of flow channel 121 (as Figure 4 ), to close flow channel 121, to prevent the reverse water flow from polluting the water source and water inlet channel, to realize the check function.

[0038] According to the flow-limiting and reverse-stopping device 1000 provided in the embodiment of the utility model, the shaft part 220 which can be elastically deformed along the water inlet direction and compressed can realize the movable setting of the diaphragm part 210, and the flow passage 121 with gradually reduced water passing area cooperates with the diaphragm part 210, so that the area available for water flow decreases with the increase of water flow, thereby realizing the effective limitation of water flow. Meanwhile, the skirt 211 on the diaphragm part 210 can also block the reverse water flow, thereby realizing the reverse stopping. The flow-limiting and reverse-stopping device 1000 in the embodiment of the utility model can realize the flow-limiting and reverse-stopping function by using only one flow-limiting part 200, without the cooperation of multiple parts such as springs, and has simple structure and convenient assembly.

[0039] Reference Figure 3 And Figure 4 In some specific embodiments of the utility model, the diaphragm part 210 is substantially bowl-shaped, and the opening of the bowl-shaped diaphragm part 210 faces away from the water inlet 111, that is, the side of the diaphragm part 210 close to the water inlet 111 is a convex arc surface, and the side facing away from the water inlet 111 is a concave arc surface, and the area of the arc surface of any side is greater than the maximum water inlet cross-sectional area of the flow passage 121. When no water flow flows into the flow passage 121, the skirt 211 naturally opens and abuts against the inner wall of the flow passage 121, and when water flow flows into the flow passage 121 from the water outlet, the skirt 211 is impacted by the water flow, and under the support of the inner wall of the flow passage 121, the skirt 211 is tightly attached to the inner wall of the flow passage 121 to seal the flow passage and prevent the water flow from the water outlet 1221 from flowing to the water source to cause pollution.

[0040] It can be understood that the diaphragm part 210 is bowl-shaped and the opening faces away from the water inlet 111, and in the natural state, the skirt 211 opens and abuts against the inner wall of the flow passage 121, and the skirt 211 is supported by the inner wall of the flow passage 121, so when water flow enters the flow passage 121 from the water outlet 1221, the diaphragm part 210 is impacted by the water flow, and the skirt 211 is difficult to bend in the direction close to the water inlet 111.

[0041] In some specific embodiments of the utility model, the diaphragm part 210 further comprises a connecting part 214 and a deformation part 212, wherein the skirt 211 is connected to the connecting part 214 through the deformation part 212, and the side of the connecting part 214 facing away from the skirt 211 is connected to the shaft part 220, thereby realizing the connection of the diaphragm part 210 and the shaft part 220.

[0042] It is particularly pointed out here that the shaft part 220, the connecting part 214, the deformation part 212 and the skirt 211 can be sequentially spliced and connected after being respectively formed, can be integrally formed as a whole, or can be integrally formed as a whole after the skirt 211, the deformation part 212 and the connecting part 214 are integrally formed, and then spliced and connected with the shaft part 220, which is not limited here.

[0043] In the embodiment, the deformation part 212 can be designed in shape or selected in material to have a hardness obviously lower than the shaft part 220, the connecting part 214 and the skirt 211, so that when the diaphragm part 210 is impacted by water flow, the deformation part 212 is more likely to deform, and thus the skirt 211 can be bent relative to the connecting part 214.

[0044] Reference Figure 3 In some embodiments of the utility model, the connecting part 214, the deformation part 212 and the skirt 211 are integrally formed by a material with elasticity, wherein a first annular groove 213 is arranged between the connecting part 214 and the skirt 211, and the deformation part 212 is the part with a smaller thickness than the connecting part 214 and the skirt 211. When water flow impacts the diaphragm part 210, the stress generated at the deformation part 212 with a smaller thickness is greater, so the deformation part 212 deforms first, and thus the skirt 211 is bent in the direction beyond the water outlet 1221, so that the water passage is formed between the deformation part 212 and the inner wall of the flow passage 121, and water flow can pass through. Regardless of the change of water flow impact force, the deformation part 212 deforms first.

[0045] In some prior art, no corresponding deformation part is arranged on the diaphragm, so that when water flow impacts, the diaphragm is stressed as a whole, and when the water flow impact generates a large pressure value, the diaphragm can deform as a whole to expose the water flow passage. According to the flow limiting check device 1000 provided by the utility model, compared with the prior art, due to the special design of the deformation part 212, under the same water flow impact, the deformation part 212 is more likely to deform to bend the skirt 211 to expose the water flow passage, so that water can pass through under a lower water pressure, and the use environment with low water pressure can be well adapted, and the situation that water cannot be discharged under low water pressure can be avoided.

[0046] Reference Figure 3 In some specific embodiments of the utility model, the connecting part 214 extends a water blocking ring 215 on the side close to the water inlet 111. It can be understood that the water blocking ring 215 and the connecting part 214 together form a bowl-shaped structure with an opening facing the water inlet 111, so that when water flow flows from the water inlet 111 to impact the diaphragm part 210, the impact force of the water flow can be more concentrated, and most of the water flow can be prevented from directly flowing away from both sides of the diaphragm part 210, so that the water flow can more efficiently impact the diaphragm part 210, and thus the shaft part 220 is more likely to deform and compress.

[0047] Reference Figure 3 And Figure 4 In some specific embodiments of the utility model, the shaft part 220 is provided with a barrel part 221 parallel to the water inlet direction. Specifically, the shaft part 220 is hollow, that is, a cylindrical space is hollowed out in the shaft part 220 along the water inlet direction.

[0048] In the embodiment, the hollow shaft part 220 is designed, the thickness of the peripheral wall of the shaft part 220 is smaller while saving the material of the flow limiting part 200, the stress generated in the shaft part 220 in the water inlet direction is more concentrated, the shaft part 220 is more easily deformed and compressed, and even the peripheral wall of the barrel part 221 can be slightly bent and deformed in the water inlet direction (as shown in Figure 6 ), so that the moving stroke of the diaphragm part 210 is longer, and the flow limiting can be realized in a larger flow range.

[0049] It should be pointed out that "parallel to the water inlet direction" defined here does not mean that the barrel part 221 and the peripheral wall thereof are completely parallel to the water inlet direction, but are approximately parallel, for example, the peripheral wall of the barrel part 221 can be tapered or expanded in the water inlet direction at an angle, as long as the thickness of the peripheral wall of the shaft part 220 is reduced to concentrate the stress and be more easily deformed and compressed, which is not limited here.

[0050] Referring to Figure 2 and Figure 4 , in some specific embodiments of the utility model, the main body 100 further includes a rod part 112 parallel to the water inlet direction, specifically, the rod part 112 is arranged on one side of the cover body 110 close to the shell 120, when the cover body 110 is covered with the shell 120, the rod part 112 is arranged in the barrel part 221.

[0051] According to the flow limiting and reverse stopping device 1000 provided by the utility model embodiment, by arranging the rod part 112, when the device is assembled, the rod part 112 can be arranged in the barrel part 221, the deformation and compression process of the shaft part 220 can be limited and guided, the problem of excessive water flow impact force or water flow impact angle is avoided, so that the shaft part 220 is deviated or even bent in the direction perpendicular to the water inlet direction, so that the diaphragm part 210 is inclined and abuts and rubs with the inner wall of the flow channel 121, thereby generating interference and jamming, affecting the normal working process of the flow limiting part 200.

[0052] Referring to Figure 3 and Figure 4 , in some specific embodiments of the utility model, the inner wall of the barrel part 221 extends in the direction close to the water inlet 111 and forms a sealing ring 222, when the rod part 112 is arranged in the barrel part 221, the sealing ring 222 abuts on the outer peripheral wall of the rod part 112. Figure 3The opening of the sealing ring 222 gradually narrows from the barrel portion 221 to the water inlet 111, and it can be understood that the area of the smallest opening of the sealing ring 222 is the same as the cross-sectional area of the rod portion 112, or the cross-sectional area of the smallest opening of the sealing ring 222 can be smaller than the cross-sectional area of the rod portion 112, so that the end of the sealing ring 222 close to the water inlet 111 can be in interference fit with the outer peripheral wall of the rod portion 112.

[0053] According to the flow limiting check device 1000 provided in the embodiment of the utility model, the outer peripheral wall of the sealing ring 222 and the rod portion 112 can be tightly abutted to seal the barrel portion 221, so that the water flow cannot flow through the gap between the outer peripheral wall of the rod portion 112 and the inner peripheral wall of the barrel portion 221, the water flowing into the gap is avoided from being absorbed by the inner peripheral wall of the shaft portion 220 and the outer peripheral wall of the rod portion 112 to affect the deformation and compression of the shaft portion 220, and the impact water flow is also avoided from leaking through the gap to cause pressure relief, so that the impact and pushing effect of the water flow on the flow limiting piece 200 is weakened. Moreover, since the sealing ring 222 is in abutment with the outer wall of the rod portion 112 in an inclined manner, when the water flow is larger, the water flow pressure on the outer wall of the sealing ring 222 is larger, so that the sealing ring 222 is more tightly abutted with the outer wall of the rod portion 112, and the sealing effect is better, thereby avoiding that the sealing ring 222 is opened by the water flow with a large pressure to cause sealing failure.

[0054] Reference Figure 3 and Figure 4 In some specific embodiments of the utility model, at least one second annular groove 223 is arranged on the inner peripheral wall of the barrel portion 221.

[0055] In the embodiment of the utility model, the second annular groove 223 is further formed by hollowing out the inner peripheral wall in the barrel portion 221, so that the thickness of the barrel wall at the second annular groove 223 is smaller, and therefore the stress on the shaft portion 220 under the impact of the water flow is larger, and the shaft portion 220 is more likely to bend or even fold, so that the moving stroke of the diaphragm portion 210 is longer, and the flow limiting can be realized in a larger flow variation range.

[0056] It can be understood that the second annular groove 223 can be arranged in multiple numbers, the multiple second annular grooves 223 are parallel to each other, or even the multiple second annular grooves 223 are sequentially connected in the water inlet direction, so as to further increase the deformation amount of the shaft portion 220 and the stroke amount of the diaphragm portion 210, and improve the flow limiting effect.

[0057] Reference Figure 1 and Figure 4In some specific embodiments of the utility model, the shell 120 is provided with a baffle 122 on the end away from the cover 110, and the plane where the baffle 122 is located is perpendicular to the water inlet direction. Among them, the baffle 122 is hollowed out with a water outlet 1221 and a rod hole 1222, the position of the rod hole 1222 corresponds to the position of the rod part 112 after the cover 110 and the shell 120 are assembled, so that the end of the rod part 112 away from the cover 110 can be inserted into the rod hole 1222 to complete the butt joint.

[0058] In the embodiment of the utility model, when the cover 110 is covered on the shell 120, one end of the rod part 112 can be inserted into the rod hole 1222, which facilitates the accurate butt joint of the cover 110 and the shell 120 during assembly, and at the same time, the rod hole 1222 can also limit the movement of the rod part 112, avoiding its left and right shaking in the flow channel 121, so as to drive the interference between the flow limiting piece 200 and the inner wall of the flow channel 121.

[0059] In the description of the utility model, it should be understood that the directions or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, structure and operation, so it cannot be understood as a limitation on the utility model.

[0060] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0061] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0062] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include the first and second features directly contacting, or can include the first and second features not directly contacting but contacting through another feature between them. Moreover, the first feature "on", "above" and "on top of" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "underneath" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0063] In the description of the present application, the description referring to the terms "some embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0064] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A flow limiting check device, characterized in that, The application relates to a flow-limiting and backflow-preventing device. The main body comprises a flow channel, which comprises a water inlet and a water outlet, and the water area of the flow channel gradually decreases along the water inlet direction. The flow-limiting member is arranged in the flow channel and comprises a diaphragm part and a shaft part which can be elastically deformed along the water inlet direction. When water flows into the flow channel from the water inlet, the diaphragm part can be impacted to make the skirt part bend in the direction away from the water inlet and make the shaft part compress to move the diaphragm part in the direction away from the water inlet. When water flows into the flow channel from the water outlet, the diaphragm part can be impacted to make the skirt part close the flow channel.

2. The flow limiting check device of claim 1, wherein The diaphragm part is in a bowl shape, and the opening of the diaphragm part is away from the water inlet.

3. The flow limiting check device of claim 1, wherein When no water flows into the flow channel or water flows into the flow channel from the water outlet, the skirt part abuts against the inner wall of the flow channel.

4. The flow limiting check device of claim 3, wherein The diaphragm part comprises a connecting part and a deformation part, the skirt part is connected with the connecting part through the deformation part, and the side of the connecting part away from the skirt part is connected with the shaft part.

5. The flow limiting check device of claim 1, wherein The connecting part extends a water-blocking ring on the side close to the water inlet.

6. The flow limiting check device of claim 5, wherein, The shaft part is provided with a cylinder part parallel to the water inlet direction.

7. The flow limiting check device of claim 6, wherein The main body further comprises a rod part parallel to the water inlet direction, and the rod part is arranged in the cylinder part.

8. The flow limiting check device of claim 6, wherein, The inner wall of the cylinder part extends a sealing ring along the direction close to the water inlet, and when the rod part is arranged in the cylinder part, the sealing ring abuts against the outer peripheral wall of the rod part.

9. The flow limiting check device of claim 6, wherein, The inner peripheral wall of the cylinder part is provided with at least one second annular groove.

10. A water outlet device characterized by comprising: The main body comprises a shell and a cover, and the rod part is arranged on the side of the cover close to the shell. The application further relates to a flow-limiting and backflow-preventing device comprising the device as claimed in any one of claims 1-9.

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