Bourdon tube pressure gauge

Abstract

The utility model relates to a bourdon tube pressure gauge (1) having a pressure gauge housing (2) in which a bourdon tube (6) is accommodated, which bourdon tube has an access opening (46) at a first end section (41), which access opening is connected in fluid communication to a fluid connection (48) of the pressure gauge housing (2), the bourdon tube (6) is sealed at a second end section (42) and has a helical section (44) which is helically formed about a helical axis (9) between a first end section (41) and the second end section (42), the first end section (41) being fastened to a mounting sleeve (51), and the second end section (42) being fastened to the mounting sleeve (51). The mounting sleeve is received in a stationary manner in a receiving bore (24) of the pressure gauge housing (2).

Description

Technical Field

[0001] The invention relates to a Bourdon tube pressure gauge (also known as a Bourdon tube pressure gauge, Rohrfedermanometer) with a pressure gauge housing in which a Bourdon tube is accommodated, the Bourdon tube having an access opening at a first end section, the access opening being connected in a fluidic manner to a fluid connection of the pressure gauge housing, wherein the Bourdon tube is sealed at a second end section and has a spiral section which is designed spirally around a spiral axis between the first end section and the second end section. The invention also relates to a method for producing a Bourdon tube pressure gauge. Background Art

[0002] The current calibration process for Bourdon tube pressure gauges is relatively complex. Summary of the invention

[0003] The object of the present invention is to provide a Bourdon tube pressure gauge and a method for producing a Bourdon tube pressure gauge, with which a calibration process for the Bourdon tube pressure gauge can be simplified.

[0004] The object is achieved by a Bourdon tube pressure gauge having the following features: the Bourdon tube pressure gauge comprises a pressure gauge housing in which a Bourdon tube is accommodated, the Bourdon tube having an access opening at a first end section, the access opening being connected to a fluid connection of the pressure gauge housing in a fluid-connected manner, wherein the Bourdon tube is sealed at a second end section and has a spiral section, which is designed in a spiral shape around a spiral axis between the first end section and the second end section, and wherein the first end section is fixed to a mounting sleeve, which is accommodated in a receiving bore of the pressure gauge housing in a positionally fixed manner.

[0005] The pressure gauge housing has several functions for the Bourdon tube pressure gauge, which are briefly outlined below. The pressure gauge housing is preferably constructed in multiple parts and can, for example, include a housing base and a housing cover. At least from a mechanical point of view, the pressure gauge housing delimits a substantially sealed hollow space, which serves to accommodate the Bourdon tube and thus protects the Bourdon tube from external mechanical influences when the Bourdon tube pressure gauge is used in accordance with the regulations. In addition, a fluid connection is constructed at the pressure gauge housing, which is provided for coupling to a pressure-loaded fluid system, wherein the fluid pressure present in the fluid system is to be determined and displayed by means of the Bourdon tube pressure gauge. Optionally, the fluid connection can be constructed as a hose coupling for plugging in a flexible fluid hose or as a plug-in coupling for directly coupling the pressure gauge housing to a component of the fluid system, for example to a pressure vessel. In addition, the pressure gauge housing is provided with a scale, which is arranged adjacent to the Bourdon tube in order to enable the current fluid pressure to be read out as a function of the pressure-dependent deformation of the Bourdon tube. The scale is preferably arranged on a transparent housing section of the manometer housing, in particular a housing cover, wherein the housing section of the manometer housing provided with the scale is oriented at least substantially normal to the screw axis of the Bourdon tube. In this case, it is preferably provided that the scale is designed as a ring or a ring segment and that a marking or indicator is arranged on the second end section of the Bourdon tube, which allows the pressure-dependent position of the second end section to be associated with the scale value of the scale.

[0006] The Bourdon tube is made of a tube, in particular a metal tube, which has an access opening at a first end section, which is connected to the fluid connection of the pressure gauge housing in a fluid-connected manner. The Bourdon tube is closed at the second end section and is therefore designed to be fluid-tight at the end side, so that the fluid pressure applied to the access opening of the first end section is uniform throughout the entire Bourdon tube. Due to the geometric design of the Bourdon tube, the Bourdon tube has a spiral section between the first end section and the second end section, which is designed spirally around the spiral axis, and the pressure loading of the Bourdon tube causes the second end section to undergo a rotational movement in a rotational plane oriented transversely to the spiral axis due to the expansion of the tube associated with the pressure loading (this expansion occurs in principle in all three spatial directions). This pivoting movement is at least substantially proportional to the fluid pressure, which is applied to the first access opening and thus enables the determination of the fluid pressure using a scale.

[0007] For the advantageous coupling of the Bourdon tube to a pressure gauge housing (in particular a housing base) which is preferably manufactured from plastic (in particular using a plastic injection molding method), a mounting sleeve is provided which is connected in a fluid-tight manner to a first end section of the Bourdon tube. For the intended use of the Bourdon tube pressure gauge, the mounting sleeve is received in a positionally fixed manner in a receiving bore of the pressure gauge housing (in particular a housing base) such that during intended use, i.e. during the execution of pressure processes, a relative movement between the first end section of the Bourdon tube and the pressure gauge housing is prevented. However, during the manufacture of the Bourdon tube pressure gauge, after the mounting sleeve connected to the Bourdon tube has been installed in the receiving bore, a rotational calibration of the Bourdon tube relative to the pressure gauge housing about the screw axis can be carried out. By way of example, it is provided that, after this assembly process, the Bourdon tube pressure gauge can be calibrated in that a predetermined test pressure is applied to the fluid connection and the assembly consisting of the Bourdon tube and the assembly sleeve is rotated relative to the pressure gauge housing about the screw axis in order to achieve, purely by way of example, an overlap between the second end section of the Bourdon tube and a marking constructed on the pressure gauge housing.

[0008] After the calibration process is completed, the final assembly of the Bourdon tube pressure gauge can be performed. For this purpose, it can be provided, for example, that the housing base part provided with the Bourdon tube is connected to the housing cover, for example by latching and / or bonding and / or ultrasonically welding the housing cover to the housing base part.

[0009] Advantageous developments of the invention are the subject matter of the dependent claims.

[0010] It is expedient that the mounting sleeve is received in the receiving hole in a form-fitting manner along the screw axis and in a force-fitting manner radially relative to the screw axis. The form-fitting coupling between the mounting sleeve and the receiving hole of the pressure gauge housing ensures that the pressure occurring during the prescribed use of the Bourdon tube pressure gauge (the pressure is particularly oriented in the direction of the screw axis) does not lead to an undesired displacement of the mounting sleeve relative to the pressure gauge housing. The force-fitting coupling between the mounting sleeve and the pressure gauge housing, which is arranged in the radial direction relative to the screw axis, can be achieved, for example, by selecting a suitable fit between the outer surface of the mounting sleeve and the inner surface of the receiving hole. This is particularly applicable to the case where the mounting sleeve and the receiving hole are each constructed cylindrically in sections and the cylindrical sections determine the contact surface between the two components.

[0011] It is preferably arranged that the first end section and the mounting sleeve are arranged parallel to the spiral axis, in particular coaxially, and / or that the first end section of the Bourdon tube is fixed to the mounting sleeve by material fit, in particular bonded into the mounting sleeve. The first end section of the Bourdon tube is preferably constructed as a cylindrical tube section and has a tube axis, which is oriented parallel to the central axis of the mounting sleeve of the preferably cylindrical structure. In the case where the tube axis, the central axis and the spiral axis are oriented in parallel, as long as the Bourdon tube is subjected to pressure loading, a favorable relative movement of the second end region relative to the pressure gauge housing on the circular path section is achieved. In order to achieve a material fit and fluid-tight connection between the Bourdon tube and the mounting sleeve, different connection methods can be provided, such as laser welding, ultrasonic welding, soldering, bonding, pressing or a combination thereof.

[0012] In a further development of the invention, it is provided that the mounting sleeve has an annular flange (or collar, ringbund) which projects radially outwards (especially as a barb with a wedge-shaped profile) and has an outer diameter which is larger than the inner diameter of the receiving opening. The task of the annular flange is to ensure the desired form-fit connection between the mounting sleeve and the receiving opening in the pressure gauge housing in the axial direction along the screw axis, while at the same time not affecting the possibility of a rotational relative movement of the mounting sleeve relative to the receiving opening, which relative movement should be ensured by a force-fit coupling between the mounting sleeve and the receiving opening acting in a radial direction transverse to the screw axis. It is preferably provided that the annular flange has a wedge-shaped, especially triangular cross section in a cross-sectional plane that also includes the screw axis and is designed to taper along the screw axis in the direction of the access opening of the first end section. During the assembly process, in which the sleeve is pushed into the receiving opening of the pressure gauge housing with a preferably linear assembly movement, in particular parallel to the screw axis, an elastic displacement or an elastic and plastic displacement of the material at the inner surface of the receiving opening is caused by the wedge-shaped geometry of the annular collar. The assembly force to be applied to the assembly sleeve in order to carry out the insertion process is dependent on the material selection for the assembly sleeve and the pressure gauge housing and on the geometry of the two components. Once the assembly sleeve has been pushed into the pressure gauge housing by the desired length, a combined force-fitting and form-fitting locking occurs between the assembly sleeve and the pressure gauge housing by the interaction between the wedge-shaped annular collar and the inner surface of the receiving opening, since the annular collar in the form of a barb engages in the pressure gauge housing by elastic deformation or elastic and plastic deformation of the inner surface of the receiving opening.

[0013] In another embodiment of the present invention, the mounting sleeve is provided with an annular groove extending inwardly in the radial direction, the annular groove is configured to receive a sealing ring, and the sealing ring is received in the annular groove of the mounting sleeve, and the sealing ring is configured to seal against the groove base of the annular groove and the inner surface of the receiving hole. Thus, a fluid-tight coupling between the inner surface of the receiving hole and the mounting sleeve is achieved, so that the fluid loaded with pressure provided at the fluid connection of the pressure gauge housing cannot leak through the gap that may remain between the mounting sleeve and the inner surface of the receiving hole. The sealing ring can be configured in particular as an O-ring with a circular cross section, as an O-ring with an elliptical cross section, or as a lip seal.

[0014] Advantageously, an annular flange protruding radially inwards is formed in the receiving bore, in particular adjacent to the access opening of the receiving bore, which forms an axial undercut for the mounting sleeve. This additionally supports the above-described form-fitting locking between the annular flange of the mounting sleeve and the inner surface of the receiving bore. To this end, the annular flange of the mounting sleeve rests with a preferably annular end face oriented in the axial direction in a form-fitting manner in the axial direction on the opposite axial end face of the annular flange protruding radially inwards.

[0015] The receiving bore is expediently connected to the fluid connection in a fluid-communicating manner, thereby establishing the desired fluid-communicating connection between the access opening at the first end section of the Bourdon tube and the fluid connection at the pressure gauge housing in a simple manner.

[0016] The object of the present invention is achieved by a method for producing a Bourdon tube pressure gauge, the method comprising the following steps: providing a pressure gauge housing, the pressure gauge housing being provided with a receiving hole for receiving a mounting sleeve; providing a Bourdon tube, the Bourdon tube being fixed to the mounting sleeve with a first end section; pressing the mounting sleeve into the receiving hole, so that an access opening of the first end section of the Bourdon tube is connected in a fluid-tight manner to a fluid connection portion of the pressure gauge housing extending from the receiving hole; providing a preset fluid pressure at the fluid connection portion; and rotationally aligning an indicator element arranged at a sealingly constructed second end region of the Bourdon tube to a preset position relative to the pressure gauge housing by rotating the mounting sleeve about a sleeve axis of the mounting sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] An advantageous embodiment of the invention is shown in the drawings.

[0018] Figure 1 A perspective view of a Bourdon tube manometer is shown;

[0019] Figure 2Shows the Figure 1 Exploded perspective view of the Bourdon tube pressure gauge;

[0020] Figure 3 Shows the Figure 1 A cross-sectional view of a Bourdon tube pressure gauge; and

[0021] Figure 4 shows the application in accordance with Figures 1 to 3 Side view of the assembly sleeve in a Bourdon tube pressure gauge. DETAILED DESCRIPTION

[0022] Figure 1 The illustrated Bourdon tube pressure gauge 1, which can be used, for example, in a pneumatic system (not shown) for displaying the pneumatic system pressure, comprises a pressure gauge housing 2 with a Bourdon tube 6 accommodated therein. The pressure gauge housing 2 is divided into a housing base part 3 and a housing cover part 4, which are coupled to one another in a form-fitting manner by means of a latching connection described in more detail below and delimit a hollow space 7 in which the Bourdon tube 6 is accommodated. The housing cover part 4 is provided with a transparent cover glass 5, for example made of PMMA / plexiglass, through which the Bourdon tube 6 can be observed from the outside. The Bourdon tube 6, which is helically shaped at least in sections, is designed in such a way that it undergoes an elastic deformation when pressure is applied, which leads to a pivoting movement of an indicator part 8 fastened to the Bourdon tube 6 about a helical axis 9, as indicated by a movement arrow 10. The cover glass 5 is provided with a scale 11 which enables an observer to associate a pressure measurement value with an indicator position of the indicator 8. Purely by way of example, the scale 11 is designed only as a bar-shaped arrangement without associated numbers.

[0023] By way of example, the housing base 3, the housing cover 4 and the cover glass 5 are each designed as a plastic injection-molded part. On the housing base 3 having a square outer geometry, a fixing strip 17 is respectively integrally molded in one piece on the opposite side walls 15, 16, which fixing strips each extend along the longest edge of the respective side wall 15, 16 and are provided with through-holes 18. This makes it possible to advantageously fix the Bourdon tube pressure gauge 1 in a machine component (not shown), for example a switch cabinet of a processing machine.

[0024] As from Figure 2As can be seen from the illustration of , the mutually opposing side walls 15, 16 and the side walls 19, 20 connected thereto and likewise mutually opposing delimit a recess 21 with a purely exemplary flat bottom region 22. It is provided by way of example that the side walls 15, 16, 19, 20 each have the same length, height and thickness and that the corresponding adjacent side walls 15, 16, 19, 20 are oriented at right angles to one another, whereby the recess 21 has an at least substantially square geometry. The bottom region 22 is square and has a connecting piece 23, which extends along the screw axis 9 and is designed as a circular sleeve. The central hole in the connecting piece 23 forms a receiving hole 24, which is described in more detail below. The receiving hole is designed purely by way of example as a cylindrical stepped hole with a first hole section 81 having a first diameter 82 and a second hole section 83 having a second diameter 84.

[0025] A cutout designed as a pocket 25 is provided on the mutually opposite side walls 15, 16, which cutouts each have a rectangular cross section purely by way of example and are used to receive a latching tongue 31 of the housing cover 4 in order to achieve the desired form-fitting locking between the housing base 3 and the housing cover 4. Furthermore, a marking 26 is arranged on the bottom region 22, which can be used for the rotational alignment of the Bourdon tube 6, as will be described in more detail below.

[0026] As from Figure 2 As can also be seen from the illustration of FIG. 2 , the housing cover 4 comprises a coupling section 28 having a square cross section adapted to the geometry of the housing base 3 and a cylindrical section 29 integrally formed on the coupling section and serving to receive the cover glass 5. On the coupling section 28, on the end faces 32 facing away from the cylindrical section 29, there are arranged latching tongues 31 arranged in the corner region and extending along the screw axis 9, which are provided for a positive locking process into a corresponding pocket 25 of the housing base 2. The housing cover 4 is designed to be thin-walled with a wall thickness that is significantly smaller than the spatial expansion of the housing cover 4. On the inner surface 33 of the cylindrical section 29, there are arranged retaining projections 30, which are arranged circumferentially in the radial direction and preferably at equal distances, projecting radially inwards, and are provided for fixing the cover glass 5.

[0027] In addition, a guide projection 34 extending along the screw axis 9 is provided on the inner surface 33 of the cylindrical section 29. The cover glass 5 has a Figure 2The cutouts on the edge, which are not visible in the figure, correspond to the guide projections 34 and together with the guide projections 34 ensure the correct rotational positioning of the cover glass 5 relative to the housing cover 4 , whereby the scale 11 is correctly aligned relative to the housing base 3 .

[0028] The Bourdon tube 6 is produced from an initially cylindrical metal tube during the reshaping process, wherein the first end section 41 of the Bourdon tube 6 retains the cylindrical geometry and is oriented along the screw axis 9. The end-side access opening 46 formed at the first end section 41 enables the pressure loading of the Bourdon tube 6 and thus the desired deformation of the Bourdon tube 6, by means of which a pressure display is achieved.

[0029] The metal tube is reshaped adjacent to the first end section 41 so that it has a substantially rectangular cross section and is sealed at the second end section 42 facing away from the first end section 41, for example by a welding process, a soldering process or a reshaping process. In the region between the first end section 41 and the second end section 42, the rectangularly reshaped metal tube is bent such that a middle section 43 is formed, which extends in the radial direction transversely to the spiral axis 9. Adjacent to the middle section 43, the spiral reshaping of the metal tube is carried out, thereby forming a spiral section 44, from which the second end section 42 projects outwards in the radial direction at a right angle.

[0030] For the coupling between the Bourdon tube 6 and the housing base part 3, a mounting sleeve 51 is provided, which can be produced, for example, as a turned part from a metal material and is provided for producing a fluid-tight mechanical connection between the first end section 41 of the Bourdon tube 6 and the receiving opening 24 in the connecting piece 23. Figure 2 , Figure 3 and Figure 4 As can be seen from the illustration, the mounting sleeve 51 has a plurality of sections arranged one next to the other along the sleeve axis 52 and a recess 53 designed coaxially to the sleeve axis 52 , which performs different functions in interaction with the housing base part 3 and with the Bourdon tube 6 .

[0031] Purely by way of example, the mounting sleeve 51 has a first cylindrical section 61, a second cylindrical section 62 adjacent to the first cylindrical section, a first conical section 63 adjacent to the second cylindrical section (the first conical section is also called an annular flange), a third cylindrical section 64 adjacent to the first conical section, a fourth cylindrical section 65 adjacent to the third cylindrical section, a fifth cylindrical section 66 adjacent to the fourth cylindrical section, and a second conical section 67.

[0032] The first cylindrical section 61 has a first diameter 71 which is greater than a first diameter 82 of the receiving opening 24, so that the first cylindrical section 61 serves as a depth stop for the mounting sleeve 51 during the press-in process into the housing base part 3, which takes place along the assembly direction 85. The second cylindrical section 62 has a second diameter 72 which corresponds to the first diameter 82 of the receiving opening 24, so that after the mounting sleeve 51 has been installed in the receiving opening 24, a friction-fitting coupling is achieved between the mounting sleeve 51 and the housing base part 3.

[0033] The first conical section 63 is designed purely by way of example with a triangular contour and has a maximum diameter 73 which is greater than the first diameter 82 and the second diameter 84 of the hole sections 81 and 83 of the receiving hole 24. The conical section 63 tapers in the direction of the third cylindrical section 64 and is shaped according to Figure 3 The illustration is used in the form of a barb to fix the mounting sleeve 51 axially in the receiving hole 24 opposite to the mounting direction 85. Here, the conical section 63 is supported with an axial end face 68 (which is purely exemplarily designed as annular) on the opposite axial end face 86 of the receiving hole 24.

[0034] The third diameter 74 of the third cylindrical section 64 is identical to the second diameter 72 of the second cylindrical section 62. The fourth diameter 75 of the fourth cylindrical section 65 is significantly smaller than the third diameter 74, thereby forming a circumferential groove 54 at the mounting sleeve 51, which is shaped according to the embodiment of the present invention. Figure 3 The illustration can be used to receive the sealing ring 55. The sealing ring 55 can achieve a fluid-tight coupling between the mounting sleeve 51 and the inner surface 27 of the receiving bore 24. A fifth cylindrical section 66 with a fifth diameter 76 extends adjacent to the fourth cylindrical section, which is smaller than the second diameter 84 of the second bore section 83. The fifth cylindrical section 66 and the second conical section 67 adjoining the fifth cylindrical section support the execution of the press-in process for pressing the mounting sleeve 51 into the housing base part 3.

[0035] The recess 53 formed in the mounting sleeve 51 has a first conical section 91, a first cylindrical section 92 adjacent to the first conical section, a second conical section 93 adjacent to the first cylindrical section, and a second cylindrical section 94 adjacent to the second conical section. Figure 3 As can be seen from the illustration of , the outer diameter 45 of the first end section 41 of the Bourdon tube 6 is slightly smaller than the first inner diameter 95 of the first cylindrical section 92 of the recess 53, so that the Bourdon tube 6 can be received in the mounting sleeve 51 with the first end section 41 essentially without force. A material-fitting coupling is then provided between the first end section 41 and the mounting sleeve 51, for which purpose in particular an adhesive connection 49 can be provided, such as in Figure 3 As indicated in .

[0036] The receiving bore 24 is designed in its length extension in such a way that it can receive the mounting sleeve 51 and the end section 41 of the Bourdon tube 6 received therein in an axial direction without contact. The fluid channel 47 extends adjacent to the receiving bore 24 to a fluid connection 48 that protrudes tubularly from the rear side 12 of the housing base 3. By way of example, the fluid connection 48 can be used to plug in a fluid hose (not shown in detail) in order to establish a fluid-connecting connection between the Bourdon tube pressure gauge 1 and a pneumatic system (not shown).

[0037] The production of the Bourdon tube pressure gauge 1 takes place in the production steps described below. It is assumed that the housing base 3, the housing cover 4 and the cover glass 5 have already been produced in a plastic injection molding process. In addition, the Bourdon tube 6 is molded from a metal tube in a remolding process, sealed at the second end section 42 and bonded to the mounting sleeve 51 in a sealing manner with the first end section 41.

[0038] Therefore, in the first assembly step, a pressing process is performed to press the assembly sleeve 51 with the Bourdon tube 6 and the sealing ring 55 into the connection piece 23 of the housing base part 3 along the assembly direction 85. By way of example, the assembly sleeve 51 engages in the connection piece 23 until the first cylindrical section 61 bears flatly against the connection piece 23.

[0039] When the pressing process is carried out, the rotational alignment of the assembly consisting of the Bourdon tube 6 and the mounting sleeve 51 relative to the housing base 3 is not important. This rotational alignment is determined in a subsequent calibration step. For this purpose, a defined fluid pressure is applied at the fluid connection 48, whereby the Bourdon tube 6 performs an expansion movement, during which the indicator 8 arranged at the second end section 42 performs a pivoting movement about the screw axis 9. Once the defined fluid pressure has been applied, a torque can be applied to the mounting sleeve 51 about the screw axis 9 using a tool (not shown) that can be engaged in a blind hole 69 introduced at the end side of the first cylindrical section 61 and extending parallel to the screw axis 9, so as to rotate the mounting sleeve 51 while overcoming the friction between the second cylindrical section 62 and the first hole section 81. It is provided, by way of example, that the assembly consisting of the Bourdon tube 6 and the mounting sleeve 51 can be rotated to such an extent that the indicator 8 overlaps with the marking 26 at the bottom area 22 of the housing base 3. This calibration ensures that the spatial orientation of the scale 11 on the cover glass 5, which is determined by the guide projection 34 and the corresponding cutout relative to the housing cover 4, is also correct relative to the assembly consisting of the Bourdon tube 6 and the mounting sleeve 51 fixed to the housing base 3, because only in this case is a correct pressure display ensured.

Claims

1. A Bourdon tube pressure gauge (1) having a pressure gauge housing (2) in which a Bourdon tube (6) is accommodated, the Bourdon tube having an access opening (46) at a first end section (41) which is connected in a fluid-connecting manner to a fluid connection (48) of the pressure gauge housing (2), wherein: The Bourdon tube (6) is sealed at a second end section (42) and has a spiral section (44) which is designed spirally around a spiral axis (9) between the first end section (41) and the second end section (42), wherein the first end section (41) is fixed to a mounting sleeve (51) which is received in a fixed position in a receiving bore (24) of the pressure gauge housing (2).

2. The Bourdon tube pressure gauge (1) according to claim 1, characterized in that: The mounting sleeve (51) is received in the receiving hole (24) in a form-fitting manner along the screw axis (9) and in a force-fitting manner in the radial direction relative to the screw axis (9).

3. The Bourdon tube pressure gauge (1) according to claim 1 or 2, characterized in that: The first end section (41) and the mounting sleeve (51) are arranged parallel to the screw axis (9), and / or the first end section (41) of the Bourdon tube (6) is fixed to the mounting sleeve (51) in a materially bonded manner.

4. The Bourdon tube pressure gauge (1) according to claim 3, characterized in that: The first end section (41) and the mounting sleeve (51) are arranged coaxially with the screw axis (9).

5. The Bourdon tube pressure gauge (1) according to claim 3, characterized in that: The first end section (41) of the Bourdon tube (6) is bonded into the mounting sleeve (51) in a materially bonding manner.

6. The Bourdon tube pressure gauge (1) according to claim 1 or 2, characterized in that: The mounting sleeve (51) has an annular collar (63) which projects radially outward and has an outer diameter (73) which is larger than an inner diameter (82, 84) of the receiving opening (24).

7. The Bourdon tube pressure gauge (1) according to claim 6, characterized in that The annular collar (63) is designed as a barb with a wedge-shaped profile.

8. The Bourdon tube pressure gauge (1) according to claim 1 or 2, characterized in that: The mounting sleeve (51) is provided with an annular groove (54) extending inwardly in a radial direction, the annular groove is configured to receive a sealing ring (55), and the sealing ring (55) is received in the annular groove (54) of the mounting sleeve (51), the sealing ring is configured to sealingly abut against the groove base of the annular groove (54) and against the inner surface (33) of the receiving hole (24).

9. The Bourdon tube pressure gauge (1) according to claim 1 or 2, characterized in that: An annular collar (63) is formed in the receiving opening (24) and projects radially inwards, the annular collar forming an axial undercut for the mounting sleeve (51).

10. The Bourdon tube pressure gauge (1) according to claim 9, characterized in that Adjacent to the access opening of the receiving bore (24), an annular collar (63) is formed which protrudes radially inwards and forms an axial undercut for the mounting sleeve (51).

11. The Bourdon tube pressure gauge (1) according to claim 1 or 2, characterized in that: The receiving hole (24) is connected to the fluid connection portion (48) in a fluid communication manner.

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