Self-adaptive galvanostat

Abstract

The utility model provides a self-adaptive galvanostat which comprises a pipe body, a first backflow hook plate and a second backflow hook plate, the pipe body comprises a liquid inlet, a liquid outlet and two pipelines communicated with the liquid inlet and the liquid outlet, and an obtuse angle is formed between the flow direction of the first pipeline and the flow direction of the second pipeline at the confluence position; the first backflow hook plate is fixed to the pipe body and arranged at the flow dividing position of the first pipeline and the second pipeline, and the first backflow hook plate is bent towards the first pipeline. A second backflow hook plate is fixed to the pipe body and arranged in the first pipeline, the second backflow hook plate is bent towards the upper wall of the first pipeline, under the condition of the same system and multiple branches, part of pipeline flow and flow speed are large, certain resistance eddy current is generated under the action of the backflow hook plate, the flow speed and flow are reduced, and therefore the flow rate and flow rate are reduced. Parts of small-flow and slow-flow-speed pipelines almost do not form vortexes or generate resistance, and the phenomenon of non-uniform water flow can be well solved through the alternate adjusting effect.

Description

Technical Field

[0001] The utility model relates to the technical field of pipelines, in particular to an adaptive constant current device. Background Art

[0002] For air conditioning cooling water systems, the problem of balanced water distribution on the cooling tower side is mainly solved by valve adjustment technology, and only a small part uses the latest technology products such as hydraulic pressure stabilizers.

[0003] The hydraulic stabilizer adopts an inner and outer barrel structure. Multiple circular holes are cut into the inner barrel to form a liquid level water flow. Water overflows through the circular holes, and the flow rate is adjusted by the size and position of the holes. The hydraulic stabilizer only forms partial resistance through the gravity of the water and the height of the water to form a flow adjustment effect. At present, this effect cannot achieve the expected complete balance.

[0004] The valve regulation method is to reduce the cross-sectional area and form resistance by adjusting the valve opening size, and open the valve to increase the cross-sectional area. This method has a poor regulation effect. Under different flow pressure conditions, the flow rate is different, and the required switching amount is difficult to control. At the same time, this method will form a larger system pipe resistance and increase the energy consumption of the water pump. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is how to evenly distribute the water volume on the cooling tower side.

[0006] To this end, the utility model provides an adaptive current regulator, comprising:

[0007] The tube body comprises a liquid inlet, a liquid outlet and two pipelines connecting the liquid inlet and the liquid outlet, wherein the flow directions of the first pipeline and the second pipeline form an obtuse angle at the confluence point;

[0008] A first reflux hook plate, fixed to the pipe body and arranged at the divergence point between the first pipeline and the second pipeline, the first reflux hook plate being bent toward the first pipeline;

[0009] The second reflux hook plate is fixed to the tube body and disposed in the first pipeline, and the second reflux hook plate is bent toward the upper wall of the first pipeline.

[0010] By setting a first reflux hook plate and a second reflux hook plate, the first reflux hook plate is set at the diversion point between the first pipeline and the second pipeline and bends toward the first pipeline. In the same system, in the case of multiple branches, some pipelines have a large flow rate and flow velocity. Through the action of the reflux hook plate, a certain resistance vortex is generated to reduce the flow velocity and flow rate. Some pipelines with small flow and slow flow rate almost do not form vortices and do not generate resistance. Through the above regulatory effect of mutual increase and decrease, the problem of uneven water flow can be well solved.

[0011] Optionally, after part of the liquid at the liquid inlet in the tube body is blocked and diverted by the first reflux hook plate to enter the first pipeline, this part of the liquid is blocked by the second reflux hook plate to slow down its flow rate in the first pipeline.

[0012] Optionally, the first return hook plate and the second return hook plate have the same bending direction.

[0013] Optionally, the first reflux hook plate is located at the front end of the liquid inlet end of the second pipeline and the height of the first reflux hook plate is greater than the diameter of the liquid inlet end of the second pipeline, and the liquid at the liquid inlet is configured to bypass the first reflux hook plate and then enter the second pipeline.

[0014] By setting the height of the first reflux hook plate to be greater than the diameter of the liquid inlet end of the second pipeline, it can be ensured that a certain amount of liquid level is formed at the upper end of the first reflux hook plate, so that pressure is formed in the direction of the liquid inlet of the tube body through the liquid level pressure, thereby applying resistance to the flow of liquid at the liquid inlet into the inside of the tube body.

[0015] Optionally, the diameter of the first pipeline is greater than the height of the first reflux hook plate, and a flow channel is formed between the top end of the first reflux hook plate and the top wall of the first pipeline.

[0016] Optionally, the first pipeline includes two sections of sub-pipelines and the connection between the two sections of sub-pipelines is bent, the second reflux hook plate is arranged in the sub-pipeline connected to the liquid inlet, and the sub-pipeline is arranged to be inclined upward.

[0017] Optionally, the adaptive current regulator further comprises a water regulating double spring plate fixed at the connection between the two sections of sub-pipelines, and the water regulating double spring plate is inclined toward the sub-pipeline connected to the liquid outlet.

[0018] Optionally, the second pipeline is placed horizontally, the sub-pipeline connected to the liquid outlet is placed vertically, and the second pipeline is communicated with the sub-pipeline.

[0019] Optionally, the adaptive current regulator further comprises a recoil plate fixed in the first pipeline and located at the confluence of the first pipeline and the second pipeline, wherein the recoil plate is tilted to change the flow direction of the liquid at the confluence of the first pipeline.

[0020] Optionally, an extended arc plate is further included, wherein the extended arc plate is fixed at the connection between the two sections of the sub-pipeline and extends toward the inside of the sub-pipeline connected to the liquid outlet.

[0021] Optionally, the adaptive constant current device further comprises a constant pressure tube disposed in the tube body, wherein the constant pressure tube connects the interior of the tube body with the external atmosphere.

[0022] The utility model provides an adaptive constant current device, which has the following advantages:

[0023] 1. The utility model provides an adaptive constant current device, comprising a tube body, a first reflux hook plate and a second reflux hook plate, the tube body comprising a liquid inlet, a liquid outlet and two pipelines connecting the liquid inlet and the liquid outlet, the flow directions of the first pipeline and the second pipeline at the confluence point form an obtuse angle; the first reflux hook plate is fixed to the tube body and arranged at the divergence point of the first pipeline and the second pipeline, and the first reflux hook plate is bent toward the first pipeline; the second reflux hook plate is fixed to the tube body and arranged in the first pipeline, and the second reflux hook plate is bent toward the upper wall of the first pipeline.

[0024] The adaptive constant current device of this structure is provided with a first reflux hook plate and a second reflux hook plate. The first reflux hook plate is provided at the diversion point between the first pipeline and the second pipeline and is bent toward the first pipeline. In the same system, in the case of multiple branches, some pipelines have a large flow rate and flow velocity. Through the action of the reflux hook plate, a certain resistance vortex is generated to reduce the flow velocity and flow rate. Some pipelines with small flow rate and slow flow velocity hardly form vortices and do not generate resistance. Through the above-mentioned regulation effect of mutual increase and decrease, the problem of uneven water flow can be well solved.

[0025] 2. The utility model provides an adaptive constant current device, wherein the first reflux hook plate is located at the front end of the liquid inlet end of the second pipeline and the height of the first reflux hook plate is greater than the diameter of the liquid inlet end of the second pipeline, and the liquid at the liquid inlet is configured to bypass the first reflux hook plate and then enter the second pipeline.

[0026] The adaptive constant current device of this structure can ensure that a certain amount of liquid level is formed at the upper end of the first reflux hook plate by setting the height of the first reflux hook plate to be greater than the diameter of the liquid inlet end of the second pipeline, so as to form pressure in the direction of the liquid inlet of the tube body through the liquid level pressure, thereby exerting resistance on the flow of liquid at the liquid inlet into the inside of the tube body.

[0027] 3. The utility model provides an adaptive constant current device, which also includes a recoil plate, which is fixed in the first pipeline and located at the confluence of the first pipeline and the second pipeline, and the recoil plate is tilted to change the flow direction of the liquid at the confluence of the first pipeline.

[0028] The adaptive constant current device of this structure changes the flow direction of the liquid at the confluence of the first pipeline by arranging a recoil plate, thereby achieving the purpose of introducing the water flow into the second pipeline.

[0029] 4. The utility model provides an adaptive constant current device, in which an extended arc plate is arranged to be fixed at the end of the inclined sub-pipe in the first pipeline and extends into the vertical sub-pipe, so as to prevent the liquid in the inclined sub-pipe from flowing along the inner wall of the vertical sub-pipe through the bend, thereby making it impossible to introduce the water flow out of the first pipeline into the second pipeline. That is, the cooperation of the water regulating double spring plate, the extended arc plate and the recoil plate is that the water regulating double spring plate and the extended arc plate form an opening extending into the vertical sub-pipe at the end of the inclined sub-pipe, and the water flow in the inclined sub-pipe can flow directly into the space above the recoil plate through this opening, and then change the direction of the water flow again through the recoil plate, and form a reverse flow through the second pipeline, reducing the water flow, so as to achieve the effect of automatic water volume regulation.

[0030] 5. The utility model provides an adaptive constant current device with simple product structure, ingenious design, better effect, simpler manufacturing process, less material and lifelong maintenance-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic structural view of an adaptive current regulator provided in an embodiment of the utility model;

[0033] Figure 2 A schematic diagram of liquid distribution at low flow rate in an adaptive constant flow device provided in an embodiment of the utility model;

[0034] Figure 3 A schematic diagram of liquid distribution at high flow rate in an adaptive constant flow device provided in an embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of an application scenario of the adaptive current regulator provided in an embodiment of the utility model in an air conditioning cooling water system.

[0036] Description of reference numerals:

[0037] 1-tube body;

[0038] 2-Liquid inlet flange;

[0039] 3-Liquid outlet flange;

[0040] 4-First reflux hook plate;

[0041] 5- Second reflux hook plate;

[0042] 6- double spring plate for water adjustment;

[0043] 7-Extended arc plate;

[0044] 8-Constant pressure tube hole;

[0045] 9-water retaining plate;

[0046] 10- Constant pressure tube;

[0047] 11- Recoil plate;

[0048] 12-Valve. DETAILED DESCRIPTION

[0049] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0051] Example

[0052] This embodiment provides an adaptive constant current device, such as Figure 1 As shown, it includes a pipe body 1, a liquid inlet flange 2, a liquid outlet flange 3, a first reflux hook plate 4, a second reflux hook plate 5, a water regulating double elastic plate 6, an extended arc plate 7, a constant pressure pipe hole 8, a water baffle 9, a constant pressure pipe 10, a recoil plate 11 and a valve 12.

[0053] In this embodiment, if Figure 1 As shown, the tube body 1 includes a liquid inlet, a liquid outlet and two pipelines connecting the liquid inlet and the liquid outlet. The liquid inlet flange 2 is fixed to the liquid inlet of the tube body 1, and the liquid outlet flange 3 is fixed to the liquid outlet of the tube body 1. The two pipelines connect the liquid inlet and the liquid outlet of the tube body 1.

[0054] Specifically, in this embodiment, for the convenience of explanation, it is set Figure 1 The pipeline at the top is the first pipeline. Figure 1 The pipeline in the middle and lower part is the second pipeline.

[0055] In this embodiment, the first reflux hook plate 4 is fixed to the pipe body 1 and is disposed at the divergence point between the first pipeline and the second pipeline, and the first reflux hook plate 4 is bent toward the first pipeline.

[0056] In this embodiment, if Figure 1 As shown, the first reflux hook plate 4 is located at the front end of the second pipeline liquid inlet end and the height of the first reflux hook plate 4 is greater than the diameter of the second pipeline liquid inlet end. The liquid at the liquid inlet is configured to bypass the first reflux hook plate 4 and then enter the second pipeline.

[0057] A first reflux hook plate 4 is fixed at the junction between the first pipeline and the second pipeline, and the first reflux hook plate 4 is bent toward the first pipeline. Figure 1 In the upper middle direction. Figure 4 When a branch pipe in the system shown in the figure has a small flow rate, Figure 2 As shown, the water flows directly through the second pipeline after passing through the first reflux hook plate 4. Since the water does not flow through the first pipeline and then merges with the second pipeline, no resistance is generated at the outlet of the second pipeline, and the branch pipe does not form a Tesla valve effect. At the same time, a certain amount of liquid level is formed at the upper end of the first reflux hook plate 4, and the pressure in the direction of the liquid inlet of the tube body 1 is formed by the liquid level pressure, which exerts resistance on the liquid at the liquid inlet to flow into the inside of the tube body 1, thereby playing a role in partially regulating the water volume.

[0058] By setting the height of the first reflux hook plate 4 to be greater than the diameter of the liquid inlet end of the second pipeline, it is possible to ensure that a certain amount of liquid level is formed at the upper end of the first reflux hook plate 4, so that pressure is formed toward the liquid inlet of the tube body 1 through the liquid level pressure, thereby applying resistance to the flow of liquid at the liquid inlet toward the inside of the tube body 1.

[0059] In this embodiment, the diameter of the first pipeline is greater than the height of the first reflux hook plate 4, and a flow channel is formed between the top of the first reflux hook plate 4 and the top wall of the first pipeline. By setting the diameter of the first pipeline to be greater than the height of the first reflux hook plate 4, when the pipeline flow rate and flow velocity are large, the liquid can pass over the first reflux hook plate 4 and enter the first pipeline.

[0060] Furthermore, the second reflux hook plate 5 is also fixed to the pipe body 1 and arranged in the first pipe. The first reflux hook plate 4 and the second reflux hook plate 5 have the same bending direction, both of which are toward Figure 1 The first pipeline includes two sections of sub-pipelines, and the connection between the two sections of sub-pipelines is bent. The second reflux hook plate 5 is arranged in the sub-pipeline connected to the liquid inlet, and the sub-pipeline is arranged to be inclined upward.

[0061] A first reflux hook plate 4 is fixed at the junction of the first pipeline and the second pipeline, and a second reflux hook plate 5 is further fixed in the sub-pipeline in the first pipeline at an inclined position, and the second reflux hook plate 5 is bent toward the upper wall of the first pipeline. Figure 4 When the flow rate of a branch pipe in the system shown is too large, Figure 3 As shown, most of the water will pass through the second pipeline, form eddy resistance again through the second return hook plate 5, and finally enter the vertically arranged sub-pipeline from the upper side. By setting the confluence of the first pipeline and the second pipeline so that the flow directions of the two are at an obtuse angle, the water flow is introduced into the second pipeline, and a reverse flow is formed through the second pipeline to reduce the water flow, so as to form a Tesla valve effect in the branch pipe, thereby achieving the effect of automatic water volume regulation.

[0062] In this embodiment, in order to achieve that the flow directions of the first pipeline and the second pipeline at the confluence point are at an obtuse angle, as shown in FIG. Figure 1 As shown, the recoil plate 11 is fixed in the first pipeline and is located at the confluence of the first pipeline and the second pipeline. The recoil plate 11 is tilted to change the flow direction of the liquid at the confluence of the first pipeline, thereby achieving the purpose of introducing water flow into the second pipeline.

[0063] As an alternative, the vertically arranged sub-pipeline in the first pipeline can also be arranged to be inclined toward the second pipeline, so that there is no need for the recoil plate 11 to adjust the direction of the water flow out of the first pipeline. The inclined sub-pipeline can introduce the water flow out of the first pipeline into the second pipeline, forming a reverse flow through the second pipeline, reducing the water flow, and achieving the effect of automatic water volume regulation.

[0064] In this embodiment, if Figure 1 As shown, a constant pressure tube 10 is arranged in the tube body 1, and the constant pressure tube 10 connects the inside of the tube body 1 with the outside atmosphere. A constant pressure tube hole 8 is arranged at one end of the constant pressure tube 10 inside the tube body 1, which is used to connect the inside of the tube body 1 with the inside of the constant pressure tube 10, and a valve 12 is fixed at one end of the constant pressure tube 10 outside the tube body 1.

[0065] During the entire adjustment process, the constant pressure tube 10 plays a role in stabilizing the air pressure in the tube and ensuring that the air pressure in the vertical sub-pipes in the first pipeline is equal, which creates a basis for the self-regulation of the adaptive constant flow device in this embodiment. At the same time, the constant flow tube is also an important component for completely solving the hydraulic imbalance phenomenon caused by siphoning.

[0066] In this embodiment, if Figure 1 As shown, a water baffle 9 is provided at one end of the constant pressure tube 10 inside the tube body 1 , and the water baffle 9 can prevent the liquid in the first pipeline from entering the constant pressure tube 10 .

[0067] In this embodiment, a water regulating double spring plate 6 and an extension arc plate 7 are provided at the bend in the first pipeline. The water regulating double spring plate 6 is fixed to the inner wall of the first pipeline and covers the upper end of the bend in the first pipeline. The extension arc plate 7 is fixed to the end of the inclined sub-pipe in the first pipeline and extends toward the inside of the vertical sub-pipe. The two cooperate in the first pipeline to form an opening extending toward the inside of the vertical sub-pipe at the end of the inclined sub-pipe. When the water flows through the bend in the first pipeline, it can smoothly enter the inside of the vertical sub-pipe through this opening.

[0068] Furthermore, the water regulating double elastic plate 6, the extended arc plate 7 and the recoil plate 11 have a synergistic effect on changing the flow direction of the liquid at the confluence of the first pipeline. Figure 3 As shown, an extended arc plate 7 is arranged to be fixed at the end of the inclined sub-pipe in the first pipeline and extends into the vertical sub-pipe, so as to prevent the liquid in the inclined sub-pipe from flowing along the inner wall of the vertical sub-pipe through the bend, thereby making it impossible to introduce the water flow out of the first pipeline into the second pipeline. That is, the cooperation of the water regulating double elastic plate 6, the extended arc plate 7 and the recoil plate 11 is that the water regulating double elastic plate 6 and the extended arc plate 7 form an opening extending into the vertical sub-pipe at the end of the inclined sub-pipe, and the water flow in the inclined sub-pipe can flow directly into the space above the recoil plate 11 through this opening, and then change the direction of the water flow again through the recoil plate 11, and form a reverse flow through the second pipeline, reducing the water flow, and achieving the effect of automatic water volume regulation.

[0069] like Figure 4 As shown, in the same system, in the case of multiple branches, some pipelines have large flow and velocity, and the reflux hook plate can generate a certain resistance vortex to reduce the velocity and flow; some pipelines with small flow and slow flow rate almost do not form vortices and do not generate resistance. Through the above-mentioned regulation effect of mutual increase and decrease, the problem of uneven water flow can be well solved. At the same time, the constant pressure tube 10 is used to create a basis for the self-regulation of the adaptive constant current device in this embodiment. This adaptive constant current device has the advantages of simple product structure, ingenious design, better effect, simpler manufacturing process, less material, and lifelong maintenance-free. The product is mainly designed with two materials in mind, one is 304 stainless steel and the other is carbon steel.

[0070] The adaptive constant current device provided in this embodiment is provided with a first reflux hook plate 4 and a second reflux hook plate 5. The flow hook plates are designed with an arc of 90-180, and the length of the arc varies according to the different lengths of the pipe diameters. The installation angle is 0-60 degrees horizontal or vertical to the pipe wall, preferably 0-15 degrees.

[0071] In this embodiment, the adaptive constant current device takes effect when the flow rate in the pipeline reaches more than 15%. The detailed experimental data are as follows:

[0072] Table 1 Parameters of the first reflow hook plate 4

[0073]

[0074]

[0075] Table 2 Parameters of the second reflow hook plate 5

[0076]

[0077] Table 3 Parameters of recoil plate 11

[0078]

[0079]

[0080] As shown in Tables 1 to 3 above, the first reflux hook plate 4, the second reflux hook plate 5 and the recoil plate 11 play an obvious role when the flow rate in the pipeline reaches more than 15%, which proves that the adaptive constant current device provided in this embodiment can significantly regulate the flow rate when the flow rate and flow velocity of some pipelines are large in the same system with multiple branches, and can solve the problem of uneven water flow.

[0081] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An adaptive current regulator, characterized in that: include: The tube body (1) comprises a liquid inlet, a liquid outlet and two pipelines connecting the liquid inlet and the liquid outlet, wherein the flow directions of the first pipeline and the second pipeline at the confluence point form an obtuse angle; A first reflux hook plate (4) is fixed to the pipe body (1) and is arranged at the junction where the first pipeline and the second pipeline diverge, and the first reflux hook plate (4) is bent toward the first pipeline; The second reflux hook plate (5) is fixed to the pipe body (1) and arranged in the first pipe. The second reflux hook plate (5) is bent toward the upper wall of the first pipe.

2. The adaptive current regulator according to claim 1, characterized in that: After part of the liquid at the liquid inlet in the tube body (1) is blocked and diverted by the first reflux hook plate (4) to enter the first pipeline, this part of the liquid is blocked by the second reflux hook plate (5) to slow down its flow rate in the first pipeline.

3. The adaptive current regulator according to claim 2, characterized in that: The first reflux hook plate (4) and the second reflux hook plate (5) have the same bending direction.

4. The adaptive current regulator according to any one of claims 1 to 3, characterized in that: The first reflux hook plate (4) is located at the front end of the liquid inlet of the second pipeline and the height of the first reflux hook plate (4) is greater than the diameter of the liquid inlet of the second pipeline. The liquid at the liquid inlet is configured to bypass the first reflux hook plate (4) and then enter the second pipeline.

5. The adaptive current regulator according to claim 4, characterized in that: The diameter of the first pipeline is greater than the height of the first reflux hook plate (4), and a flow channel is formed between the top of the first reflux hook plate (4) and the top wall of the first pipeline.

6. The adaptive current regulator according to claim 3, characterized in that: The first pipeline comprises two sections of sub-pipelines, and the connection between the two sections of sub-pipelines is in a bent shape. The second reflux hook plate (5) is arranged in the sub-pipeline connected to the liquid inlet, and the sub-pipeline is arranged to be inclined upward.

7. The adaptive current regulator according to claim 6, characterized in that: It also comprises a water regulating double spring plate (6) which is fixed at the connection point of the two sections of sub-pipelines, and the water regulating double spring plate (6) is inclined towards the sub-pipeline connected to the liquid outlet of the pipe body (1).

8. The adaptive current regulator according to claim 6, characterized in that: The second pipeline is placed horizontally, and the sub-pipeline connected to the liquid outlet of the pipe body (1) is placed vertically, and the second pipeline is communicated with the sub-pipeline.

9. The adaptive current regulator according to claim 6, characterized in that: It also comprises a recoil plate (11) which is fixed in the first pipeline and located at the confluence of the first pipeline and the second pipeline, and the recoil plate (11) is arranged inclined toward the outlet end of the second pipeline.

10. The adaptive current regulator according to claim 9, characterized in that: It also comprises an extended arc plate (7), which is fixed at the connection between the two sections of sub-pipelines and extends towards the inside of the sub-pipeline connected to the liquid outlet of the pipe body (1).

11. The adaptive current regulator according to claim 1, characterized in that: It also includes a constant pressure tube (10) which is arranged in the tube body (1), and the constant pressure tube (10) connects the inside of the tube body (1) with the external atmosphere.

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