Pressure flange connecting device

Abstract

The invention discloses a pressure flange connecting device, and belongs to the technical field of operation and maintenance of high-voltage equipment, the pressure flange connecting device comprises a hydraulic unit, and the hydraulic output end of the hydraulic unit is provided with a pressure conduction unit; a plurality of pressure output units are arranged at the hydraulic output end of the pressure conduction unit; a pressure balance unit is arranged on the opposite side of the movable end of the pressure output unit; the pressure balance unit is connected with the pressure conduction unit; pressure liquid output by the hydraulic unit is input into all the pressure output units through the pressure conduction unit to drive the movable ends of the pressure output units to move towards the pressure balance unit so as to clamp flanges between the pressure output units and the pressure balance unit. By means of the reasonable structural design, an operator can achieve rapid, accurate and safe butt joint of a high-pressure gas flange in a narrow space through the manual hydraulic device, operation is carried out, the participation degree of the operator is reduced, and the working efficiency is greatly improved.

Description

Technical Field

[0001] This invention patent relates to the field of high voltage equipment operation and maintenance technology, and in particular to a pressure flange connection device. Background Technology

[0002] In the process of power production, in order to ensure the normal operation of the switchgear (GIS) and avoid equipment damage, and to prevent safety and production accidents, maintenance personnel need to conduct SF6 gas testing regularly as required, and at the same time track the pressure of the SF6 gas chamber. If the pressure is found to be low, gas needs to be replenished in time to ensure the safe and stable operation of the equipment.

[0003] When conducting gas detection tests and replenishing gas for GIS, external devices need to be connected to the combined electrical unit's gas chamber. Currently, this involves multiple people working together, using conventional tools to secure the screws. Due to the high internal pressure of the GIS, one person needs to apply significant pressure during connection, which can cause hand injuries if done for extended periods or repeatedly. Furthermore, the connecting flanges and fixing screws are made of stainless steel, making them prone to breakage during the fixing process, potentially damaging the equipment. Additionally, the flange connection gap is small (approximately 0.2mm), requiring precise design to ensure a smooth connection. When the flange is closed and then closed again, a reverse pressure of 0.6MPa provides a counterforce; if this connection is not smooth, it can cause a sudden popping sound, potentially damaging hearing.

[0004] This product aims to solve problems such as personnel injury, equipment damage, and low work efficiency during SF6 gas detection and replenishment tests in GIS gas chambers by conducting stress analysis and material property research on existing docking devices, designing the device structure, and producing physical prototypes for testing and application. It will enable rapid docking with the gas chamber during GIS gas replenishment and testing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pressure flange connection device to overcome the aforementioned technical problems in related existing technologies.

[0006] The present invention adopts the following technical solution.

[0007] This invention provides a pressure flange connection device, comprising: a hydraulic unit, a pressure transmission unit, a pressure output unit, and a pressure balancing unit; The hydraulic output end of the hydraulic unit is equipped with a pressure transmission unit; The hydraulic output end of the pressure transmission unit is provided with several pressure output units; A pressure balancing unit is provided on the opposite side of the movable end of the pressure output unit. The pressure balancing unit is connected to the pressure transmission unit; The pressurized fluid output from the hydraulic unit is input to all pressure output units through the pressure transmission unit, which drives the movable end of the pressure output unit to move towards the pressure balancing unit to clamp the flange between the pressure output unit and the pressure balancing unit.

[0008] According to the aforementioned pressure flange connection device, the hydraulic unit includes: a hydraulic pipe, a hydraulic rod, and a pressure relief valve; A hydraulic rod is provided in the middle of the hydraulic pipe; The hydraulic pipe is also equipped with a pressure relief valve. Rotating the pressure relief valve allows the pressurized fluid to flow back into the hydraulic pipe.

[0009] According to the aforementioned pressure flange connection device, the hydraulic pipe is further provided with a rotating support seat, which is rotatably connected to one end of the handle. The other end of the handle is provided with a pressing handle, and the middle part of the handle is connected to the hydraulic rod.

[0010] According to the aforementioned pressure flange connection device, the pressure transmission unit includes: a fluid flow chamber, a force direction conversion chamber, a cauldron shell, a cauldron, a split nut, a threaded connector, and a connecting rod; The threaded connector is connected to the internal thread of the pressure liquid output end of the hydraulic unit. The threaded connector has a hollow structure and is connected to the liquid flow chamber. The output end face of the liquid flow chamber is provided with a number of pressure liquid output ports equal to the number of pressure output units. One end of the directional nut is connected to the pressure liquid outlet, and the other end is threaded to the force direction conversion chamber, which has a built-in connecting rod. The force conversion chamber is provided with a cauldron shell at one end near the pressure balance unit, and the cauldron shell contains a cauldron.

[0011] According to the pressure flange connection device, the force conversion chamber is provided with a first limiting groove inside the pressure transmission unit, and the force conversion chamber is provided with a connecting rod inlet / outlet groove inside the pressure transmission unit, and the first limiting groove and the connecting rod inlet / outlet groove are in communication. The connecting rod has a first piston at one end near the pressure liquid outlet and a first inclined surface at the other end; a connecting rod return spring is sleeved on the connecting rod. The connecting rod is located in the first limiting groove and the connecting rod inlet / outlet groove, and the end of the connecting rod return spring away from the first piston abuts against the end face of the connecting rod inlet / outlet groove.

[0012] According to the aforementioned pressure flange connection device, the diameter of the connecting rod entering and exiting the groove is smaller than the diameter of the first limiting groove, and the diameter of the connecting rod is the same as the diameter of the connecting rod entering and exiting the groove.

[0013] According to the pressure flange connection device, the interior of the cauldron shell near the force conversion chamber is provided with a second limiting groove, and the interior of the cauldron shell away from the force conversion chamber is provided with a cauldron inlet and outlet groove, and the second limiting groove communicates with the cauldron inlet and outlet groove. The second limiting groove is connected to the connecting rod inlet / outlet groove.

[0014] According to the pressure flange connection device, one end of the cauldron located in the force conversion chamber is provided with a second inclined surface, a second piston is provided in the middle of the cauldron, and a cauldron return spring is sleeved between the other end of the cauldron and the second piston. The cauldron is located in the second limiting groove and the cauldron inlet / outlet groove, and the end of the cauldron reset spring away from the second piston abuts against the end face of the cauldron inlet / outlet groove.

[0015] According to the aforementioned pressure flange connection device, the diameter of the cauldron inlet / outlet groove is smaller than the diameter of the second limiting groove, and the diameter of the cauldron is the same as the diameter of the cauldron inlet / outlet groove.

[0016] According to the aforementioned pressure flange connection device, the pressure balancing unit includes: a reducing nut, a limiting rod, a limiting nut, and a U-shaped clamp; The variable diameter nut is threadedly connected to the threaded connector. One end of the limiting rod is fixed to the variable diameter nut, and the other end is screwed onto the limiting nut. The side wall of the limiting nut near the pressure output unit is fixedly connected to the U-shaped clip. The limiting rod faces the same direction as the pressure output unit.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes a hydraulic unit to output pressurized liquid, which is then transmitted to all pressure output units via a pressure transmission unit. This drives the movable end of the pressure output unit to move towards the pressure balancing unit, thereby clamping the flange between the pressure output unit and the pressure balancing unit. This structural design allows operators to quickly, accurately, and safely connect high-pressure gas flanges in confined spaces, reducing personnel involvement and significantly improving work efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a pressure flange connection device according to the present invention; Figure 2This is a schematic diagram of the pressure transmission unit in a pressure flange connection device of the present invention; Figure 3 This is a schematic diagram of the pressure transmission unit, pressure output unit and pressure balance unit in a pressure flange connection device of the present invention. Figure 4 This is a cross-sectional view of the force conversion chamber and the cauldron shell in a pressure flange connection device of the present invention. Figure 5 This is a schematic diagram of the movement of the cauldron and connecting rod in a pressure flange connection device of the present invention; In the diagram: 1. Hydraulic unit; 2. Pressure transmission unit; 3. Pressure output unit; 4. Pressure balance unit; 5. Hydraulic pipe; 6. Handle; 7. Hydraulic rod; 8. Rotary support seat; 9. Pressure relief valve; 10. Variable diameter nut; 11. Limiting rod; 12. Limiting nut; 13. Fluid flow chamber; 14. First piston; 15. Connecting rod return spring; 16. Tripod return spring; 17. Force direction conversion chamber; 18. Fixing bolt; 19. Tripod shell; 20. Tripod; 21. U-shaped clip; 22. Dividing nut; 23. Press handle; 24. Threaded connector; 25. Pressure liquid output port; 26. First limiting groove; 27. Connecting rod; 28. First inclined surface; 29. ​​Second inclined surface; 30. Second piston; 31. Second limiting groove; 32. Tripod inlet / outlet groove; 33. Connecting rod inlet / outlet groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, any other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0021] In the description of this invention, it should be noted that the terms "front," "rear," "inner," "outer," "right," "left," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figure 1-5 As shown, the present invention provides a pressure flange connection device, including a hydraulic unit 1, a pressure transmission unit 2, a pressure output unit 3, and a pressure balancing unit 4.

[0024] The hydraulic output end of the hydraulic unit 1 is equipped with a pressure transmission unit 2.

[0025] The hydraulic output end of the pressure transmission unit 2 is provided with several pressure output units 3.

[0026] A pressure balancing unit 4 is provided on the opposite side of the movable end of the pressure output unit 3.

[0027] The pressure balancing unit 4 is connected to the pressure transmission unit 2.

[0028] The pressurized fluid output from the hydraulic unit 1 is input to all pressure output units 3 through the pressure transmission unit 2, which drives the movable end of the pressure output unit 3 to move toward the pressure balancing unit 4 to clamp the flange between the pressure output unit 3 and the pressure balancing unit 4.

[0029] In this embodiment, two pressure output units 3 are provided.

[0030] In another embodiment, three or more pressure output units 3 can be provided as needed to ensure clamping stability. The multiple pressure output units 3 are arranged at equal intervals.

[0031] Preferably, but not limitingly, the hydraulic unit 1 includes: a hydraulic pipe 5, a hydraulic rod 7, and a pressure relief valve 9.

[0032] The hydraulic pipe 5 is provided with a hydraulic rod 7 in the middle. By pressing the hydraulic rod 7, the pressure liquid in the hydraulic pipe 5 is controlled to flow through the pressure transmission unit 2 to the pressure output unit 3, so as to clamp the flange between the pressure output unit 3 and the pressure balance unit 4.

[0033] The hydraulic pipe 5 is also equipped with a pressure relief valve 9. Rotating the pressure relief valve 9 causes the pressurized fluid to flow back to the hydraulic pipe 5.

[0034] Further preferably, but not limitingly, the hydraulic pipe 5 is also provided with a rotating support seat 8, which is rotatably connected to one end of the handle 6. The other end of the handle 6 is provided with a pressing handle 23, and the middle part of the handle 6 is connected to the hydraulic rod 7. By pressing the pressing handle 23, the hydraulic rod 7 is moved, so that the pressurized liquid in the hydraulic pipe 5 flows through the pressure transmission unit 2 to the pressure output unit 3, so as to clamp the flange between the pressure output unit 3 and the pressure balance unit 4.

[0035] The handle 6 is connected to the rotating support 8 by rivets or other moving parts.

[0036] Preferably, but not limitingly, the pressure transmission unit 2 includes: a fluid flow chamber 13, a force direction conversion chamber 17, a cauldron shell 19, a cauldron 20, a directional nut 22, a threaded connector 24, and a connecting rod 27.

[0037] The threaded connector 24 is connected to the internal thread of the pressure liquid output end of the hydraulic unit 1.

[0038] The threaded connector 24 has a hollow structure and is connected to the liquid flow chamber 13. The output end face of the liquid flow chamber 13 is provided with the same number of pressure liquid output ports 25 as the pressure output unit 3.

[0039] One end of the directional nut 22 is connected to the pressure liquid outlet 25, and the other end is threaded to the force direction conversion chamber 17, which has a built-in connecting rod 27.

[0040] The force conversion chamber 17 is provided with a cauldron shell 19 at one end near the pressure balance unit 4, and the cauldron shell 19 contains a cauldron 20.

[0041] Further preferred, but not limiting, is that the cauldron shell 19 is connected to the force conversion chamber 17 by fixing bolts 18 or other connecting parts.

[0042] The force conversion chamber 17 is located near the pressure transmission unit 2 and has a first limiting groove 26 inside. The force conversion chamber 17 is located away from the pressure transmission unit 2 and has a connecting rod inlet / outlet groove 33 inside. The first limiting groove 26 and the connecting rod inlet / outlet groove 33 are connected.

[0043] The connecting rod 27 has a first piston 14 at one end near the pressure liquid outlet 25 and a first inclined surface 28 at the other end; a connecting rod return spring 15 is sleeved on the connecting rod 27.

[0044] The connecting rod 27 is located in the first limiting groove 26 and the connecting rod inlet / outlet groove 33, and the end of the connecting rod return spring 15 away from the first piston 14 abuts against the end face of the connecting rod inlet / outlet groove 33.

[0045] The diameter of the connecting rod inlet / outlet groove 33 is smaller than the diameter of the first limiting groove 26, and the diameter of the connecting rod 27 is the same as the diameter of the connecting rod inlet / outlet groove 33.

[0046] The diameter of the first piston 14 is the same as the inner diameter of the first limiting groove 26.

[0047] The interior of the cauldron shell 19 near the force conversion chamber 17 is provided with a second limiting groove 31, and the interior of the cauldron shell 19 away from the force conversion chamber 17 is provided with a cauldron inlet / outlet groove 32. The second limiting groove 31 and the cauldron inlet / outlet groove 32 are in communication.

[0048] The second limiting groove 31 is connected to the connecting rod inlet / outlet groove 33.

[0049] The cauldron 20 has a second inclined surface 29 at one end near the first inclined surface 28, a second piston 30 in the middle of the cauldron 20, and a cauldron return spring 16 is sleeved between the other end of the cauldron 20 and the second piston 30.

[0050] The cauldron 20 is located in the second limiting groove 31 and the cauldron inlet / outlet groove 32, and the end of the cauldron reset spring 16 away from the second piston 30 abuts against the end face of the cauldron inlet / outlet groove 32.

[0051] The diameter of the cauldron inlet / outlet groove 32 is smaller than the diameter of the second limiting groove 31, and the diameter of the cauldron 20 is the same as the diameter of the cauldron inlet / outlet groove 32.

[0052] The diameter of the second piston 30 is the same as the inner diameter of the second limiting groove 31.

[0053] The first inclined surface 28 and the second inclined surface 29 are in contact.

[0054] Preferably, but not limitingly, the pressure balancing unit 4 includes: a reducing nut 10, a limiting rod 11, a limiting nut 12, and a U-shaped clip 21.

[0055] The variable diameter nut 10 is threadedly connected to the threaded connector 24. One end of the limiting rod 11 is fixed to the variable diameter nut 10, and the other end is screwed to the limiting nut 12. The limiting nut 12 is fixedly connected to the side wall of the pressure output unit 3 near the side wall of the limiting nut 12 with the U-shaped clip 21.

[0056] The limiting rod 11 is oriented in the same direction as the pressure output unit 3.

[0057] This invention allows operators to adjust the limit nuts to accommodate flange connections of different sizes, and also enables precise inspection through smooth mechanical travel. Furthermore, the device itself reduces the number of personnel required, significantly improving work efficiency. This invention also provides greater stability in flange connections.

[0058] This invention achieves a control precision of 0.1mm for the connection threshold valve of the pressure flange by controlling the output force of a simple hydraulic device. This allows operators to easily complete the connection of the threadless pressure flange in a limited space, avoiding equipment damage and personal safety accidents that may occur during the connection of the threadless pressure flange, and achieving the goals of safety, speed, controllability, and efficiency.

[0059] This invention adjusts the limiting nut 12, thereby driving the U-shaped clamp 21 to move up and down along the limiting rod 11 to accommodate flanges of different sizes. This allows the operator to squeeze the hydraulic rod 7 with the handle 6, transmitting the pressurized liquid in the hydraulic pipe 5 through pressure transmission into the threaded connector 24. Finally, the pressure is distributed through the fluid flow chamber 13. The distributed pressurized liquid pushes the connecting rod 27 through the pressurized liquid output port. The connecting rod 27 pushes the second inclined surface 29 through the first inclined surface 28, thereby pushing the tripod 20 to move, squeezing the flange between the U-shaped clamp 21 on the pressure balance unit 4 and the pressure output unit 3, making them connect. After the connection is completed, the pressurized liquid flows back to the hydraulic pipe 5 by rotating the pressure relief valve 9, and the connecting rod return spring 15 and the tripod return spring 16 reset, completing the entire working process.

[0060] The connecting rod 27 can smoothly push the cauldron 20 to move towards the U-shaped clamp 21, completing the entire docking with high precision.

[0061] In one embodiment, for the pressure balancing unit 4, adjusting the limit nut 12 to move the U-shaped clip 21 up and down on the limit rod 11 can adapt to flanges of different sizes and meet the needs of different operating scenarios.

[0062] In summary, the beneficial effects of the present invention are as follows, compared with the prior art: This invention utilizes a hydraulic unit to output pressurized liquid, which is then transmitted to all pressure output units via a pressure transmission unit. This drives the movable end of the pressure output unit to move towards the pressure balancing unit, clamping the flange between the pressure output unit and the pressure balancing unit. This structural design allows operators to quickly, accurately, and safely connect high-pressure gas flanges in confined spaces using a manual hydraulic device, reducing human intervention and significantly improving work efficiency.

[0063] This invention can greatly reduce safety accidents during gas replenishment operations, and is convenient and efficient to use.

[0064] The present invention has a simple structure and low processing cost.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A pressure flange connection device, characterized in that, include: Hydraulic unit (1), pressure transmission unit (2), pressure output unit (3) and pressure balance unit (4); The hydraulic unit (1) is equipped with a pressure transmission unit (2) at its hydraulic output end. The hydraulic output end of the pressure transmission unit (2) is provided with several pressure output units (3); A pressure balancing unit (4) is provided on the opposite side of the movable end of the pressure output unit (3). The pressure balancing unit (4) is connected to the pressure transmission unit (2); The pressure fluid output by the hydraulic unit (1) is input to all pressure output units (3) through the pressure transmission unit (2), which drives the movable end of the pressure output unit (3) to move toward the pressure balance unit (4) to clamp the flange between the pressure output unit (3) and the pressure balance unit (4).

2. The pressure flange connection device according to claim 1, characterized in that: The hydraulic unit (1) includes: a hydraulic pipe (5), a hydraulic rod (7), and a pressure relief valve (9); The hydraulic pipe (5) is provided with a hydraulic rod (7) in the middle. The hydraulic pipe (5) is also equipped with a pressure relief valve (9). Rotating the pressure relief valve allows the pressurized fluid to flow back to the hydraulic pipe (5).

3. A pressure flange connection device according to claim 2, characterized in that: The hydraulic pipe (5) is also provided with a rotating support seat (8), which is rotatably connected to one end of the handle (6). The other end of the handle (6) is provided with a pressing handle (23), and the middle part of the handle (6) is connected to the hydraulic rod (7).

4. The pressure flange connection device according to claim 1, characterized in that: The pressure transmission unit (2) includes: a fluid flow chamber (13), a force direction conversion chamber (17), a cauldron shell (19), a cauldron (20), a split nut (22), a threaded connector (24), and a connecting rod (27). The threaded connector (24) is connected to the internal thread of the pressure liquid output end of the hydraulic unit (1); The threaded connector (24) is a hollow structure and is connected to the liquid flow chamber (13). The output end face of the liquid flow chamber (13) is provided with the same number of pressure liquid output ports (25) as the pressure output unit (3). One end of the directional nut (22) is connected to the pressure liquid outlet (25), and the other end is threaded to the force direction conversion chamber (17), which has a built-in connecting rod (27). The force conversion chamber (17) is provided with a cauldron shell (19) at one end near the pressure balance unit (4), and the cauldron shell (19) contains a cauldron (20).

5. A pressure flange connection device according to claim 4, characterized in that: The force conversion chamber (17) is located near the pressure transmission unit (2) and has a first limiting groove (26) inside. The force conversion chamber (17) is located away from the pressure transmission unit (2) and has a connecting rod inlet / outlet groove (33) inside. The first limiting groove (26) and the connecting rod inlet / outlet groove (33) are connected. The connecting rod (27) has a first piston (14) at one end near the pressure liquid outlet (25) and a first inclined surface (28) at the other end; a connecting rod return spring (15) is sleeved on the connecting rod (27). The connecting rod (27) is located in the first limiting groove (26) and the connecting rod inlet / outlet groove (33), and the end of the connecting rod return spring (15) away from the first piston (14) abuts against the end face of the connecting rod inlet / outlet groove (33).

6. A pressure flange connection device according to claim 5, characterized in that: The diameter of the connecting rod inlet / outlet groove (33) is smaller than the diameter of the first limiting groove (26), and the diameter of the connecting rod (27) is the same as the diameter of the connecting rod inlet / outlet groove (33).

7. A pressure flange connection device according to claim 5, characterized in that: The inner part of the cauldron shell (19) near the force conversion chamber (17) is provided with a second limiting groove (31), and the inner part of the cauldron shell (19) away from the force conversion chamber (17) is provided with a cauldron inlet and outlet groove (32). The second limiting groove (31) and the cauldron inlet and outlet groove (32) are connected. The second limiting groove (31) is connected to the connecting rod inlet / outlet groove (33).

8. A pressure flange connection device according to claim 7, characterized in that: The cauldron (20) has a second inclined surface (29) at one end inside the force conversion chamber (17), a second piston (30) is provided in the middle of the cauldron (20), and a cauldron return spring (16) is sleeved between the other end of the cauldron (20) and the second piston (30). The cauldron (20) is located in the second limiting groove (31) and the cauldron inlet / outlet groove (32), and the end of the cauldron reset spring (16) away from the second piston (30) abuts against the end face of the cauldron inlet / outlet groove (32).

9. A pressure flange connection device according to claim 8, characterized in that: The diameter of the cauldron inlet / outlet groove (32) is smaller than the diameter of the second limiting groove (31), and the diameter of the cauldron (20) is the same as the diameter of the cauldron inlet / outlet groove (32).

10. A pressure flange connection device according to claim 4, characterized in that: The pressure balancing unit (4) includes: a variable diameter nut (10), a limiting rod (11), a limiting nut (12), and a U-shaped clip (21). The variable diameter nut (10) is threadedly connected to the threaded connector (24). One end of the limiting rod (11) is fixed on the variable diameter nut (10), and the other end is screwed onto the limiting nut (12). The limiting nut (12) is fixedly connected to the U-shaped clip (21) on one side wall near the pressure output unit (3). The limiting rod (11) and the pressure output unit (3) are oriented in the same direction.

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