CN113607327B

CN113607327B - Bowden tube pressure gauge

Info

Publication number: CN113607327B
Application number: CN202110751771.4A
Authority: CN
Inventors: 陈小平; 陈民标
Original assignee: Ningbo Xuri Temperature And Pressure Instrument Co ltd
Current assignee: Ningbo Xuri Temperature And Pressure Instrument Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2023-07-14
Anticipated expiration: 2041-07-02
Also published as: CN113607327A

Abstract

The invention discloses a Bowden tube pressure gauge which comprises a connector, a Bowden tube and a transmission mechanism, wherein the Bowden tube comprises a spiral section, a connecting section and a movable section, wherein the connecting section and the movable section are respectively connected to two ends of the spiral section, the first end of the movable section is connected with the transmission mechanism, the second end of the movable section is connected with the spiral section, an included angle between a plane where the movable section is located and an axis of the spiral section is smaller than 90 degrees, and the second end of the movable section is close to the plane where the connecting section is located. The structural arrangement of the Bowden tube is optimized, the use durability of the Bowden tube is improved, and the friction force during the movement of the transmission mechanism is reduced, so that the abrasion of the transmission mechanism is avoided, and the durability of the pressure gauge is improved.

Description

Bowden tube pressure gauge

Technical Field

The invention relates to the technical field of pressure gauges, in particular to a Bowden tube pressure gauge.

Background

Bourdon tube is an elastic sensing element that uses bending or torsional deformation of the tube to measure pressure, also known as a spring tube. One end of the Bowden tube is fixed and the other end is movable, and the cross section of the Bowden tube is elliptical or flat. The pipe with non-circular cross section is gradually expanded into a circular shape under the action of the internal pressure, and the movable end generates displacement which is in a certain relation with the pressure. The movable end drives the pointer to indicate the pressure. The most commonly used bourdon tube is of the C-type, and in addition, there are spiral, C-type combinations, and the like. The material of the Bowden tube adopts copper-based or iron-based alloy. The pressure sensor has smaller sensitivity compared with other pressure sensitive elements, is commonly used for measuring larger pressure, and is often used in combination with other elastic elements. Bourdon tube is widely used in many instruments, particularly for pressure and force measurements.

At present the bourdon tube pressure gauge, the patent number of the invention disclosed in the patent "Jili clock" is Jili modified: TWM384996U. Disclosed is: the shell is provided with a containing cavity in a concave way at one end, a screw hole in a concave way is formed in the bottom surface of the containing cavity, and a first through hole communicated with the screw hole and the containing cavity is formed in the other end of the shell; the connector is used for providing elements for assembling the Bowden tube and the pointer transmission mechanism and is provided with a base, wherein the bottom surface of the base is provided with a screwing part locked in a screw hole of the shell, and the base is provided with a Bowden tube combining part and a second through hole for communicating the Bowden tube combining part with the screwing part; a Bowden tube, such as a tube body having a closed end and an open end, the open end being joined to the Bowden tube junction portion of the connector. The first structure of the above patent is: the Bowden tube is a tube body having an elliptical cross section, and the Bowden tube is a C-shaped tube. The second structure of the above patent is: the Bowden tube is a tube body having a circular cross section, and the Bowden tube is a V-shaped tube having a spiral portion wound around its middle section.

The Bowden tube adopting the C-shaped structure is easy to deform irreversibly after long-term use, so that the pressure value detected by the pressure gauge at the later stage is deviated. The pressure gauge reading is no longer accurate, and a new pressure gauge needs to be replaced, so that the service life of the pressure gauge is limited.

The spiral structure of the Bowden tube is adopted by the spiral pressure gauge, so that the Bowden tube has good durability, and the service life of the Bowden tube is prolonged. However, the spiral bourdon tube is displaced by expansion in the circumferential direction and also in the axial direction of the spiral segment, which is the axial direction of the spiral segment and the dial of the pressure gauge, under the action of the internal pressure. The movable end of the Bowden tube is connected with the pointer transmission mechanism, and the axial displacement of the spiral section of the Bowden tube can drive the movable end of the Bowden tube to generate axial displacement. The pointer transmission mechanism drives the pointer to rotate in the plane, and if the pointer transmission mechanism receives axial force, the force of the offset transmission plane can cause larger friction force when the pointer transmission mechanism moves, so that the durability of the pressure gauge is not high.

Disclosure of Invention

The technical problem to be solved by the invention is to provide the bourdon tube pressure gauge, optimize the structural arrangement of the bourdon tube, improve the durability of the bourdon tube, reduce the friction force of a transmission mechanism during movement, thereby avoiding the abrasion of the transmission mechanism and improving the durability of the pressure gauge.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a bourdon tube manometer, includes joint, bourdon tube and drive mechanism, bourdon tube include the spiral section and connect link and the movable section at spiral section both ends respectively, the second end and the drive mechanism of movable section be connected, the first end and the spiral section of movable section are connected, contained angle between the plane that the movable section is located and the spiral section axis is less than 90 degrees, the second end of movable section is close to the plane that the link is located.

Compared with the prior art, the invention has the advantages that the medium is led into the Bowden tube from the connector, and the medium entering the Bowden tube is sequentially led into the connecting section, the spiral section and the movable section. The Bowden tube is subjected to a deformation by the force of the medium, which deformation is transmitted by the movable section to the transmission mechanism, and the transmission mechanism drives the pointer to fluctuate to indicate the pressure value. The Bowden tube provided by the invention is provided with the spiral section, so that the service life of the Bowden tube can be effectively prolonged. After long-term use, the bourdon tube can still return to the initial state.

The invention provides that the movable section is not located on a plane perpendicular to the axis of the spiral section, but the movable section is arranged on an inclined plane. So that the end of the second end connected with the transmission mechanism is closer to the plane of the connecting section. When the spiral section is expanded under the force, the spiral section is displaced in the axial direction, and the movable section is marked as a first acting force under the force outwards along the axis of the spiral section. And the included angle between the movable section and the first acting force is larger than 90 degrees, and compared with the included angle between the movable section and the first acting force which is equal to or smaller than 90 degrees, the second end of the movable section is subjected to smaller force perpendicular to the movable section. When the movable section is connected with the transmission mechanism to transmit force, the transmission mechanism is subjected to smaller friction force, so that the transmission mechanism is effectively prevented from being worn.

The invention thus far achieves a high durability of the bourdon tube, as well as a high durability of the transmission. The service life of the pressure gauge is prolonged as a whole, and the service life of the pressure gauge can reach more than one million times.

The invention further preferably comprises the following steps: the second end of the connecting section is connected with the connector, the first end of the connecting section is connected with the spiral section, and the second end of the connecting section is close to the plane where the movable section is located.

It is also reasonable that when the helical segment is forced to expand, the helical segment is displaced axially and the connecting segment will be forced outwardly along the axis of the helical segment as a second force. And the included angle between the connecting section and the second acting force is larger than 90 degrees, and compared with the included angle between the connecting section and the second acting force which is equal to or smaller than 90 degrees, the second end of the connecting section is subjected to smaller force perpendicular to the connecting section. The connecting section is more stable with the joint connection, and the joint can realize good leakproofness with the connection of connecting section, avoids leading-in joint's medium to leak.

Specifically, the first end of the connecting section and the first end of the movable section are respectively connected at two ends of the spiral section, and the distance between the first end of the connecting section and the first end of the movable section depends on the axial length of the spiral section.

Further, the second end of the connecting section and the second end of the movable section are located on the same plane.

In the operating state of the bourdon tube, the second end of the connecting section is subjected to the force of the joint, and the second end of the movable section is subjected to the force of the transmission mechanism. The second end of the connecting section and the second end of the movable section are arranged on the same plane, namely the stress of the two ends can be concentrated on the same plane.

Further, the second end of the connecting section and the center of gravity of the spiral section are located on the same plane.

Further, the second end of the movable section and the gravity center of the spiral section are positioned on the same plane.

The structural arrangement of the Bowden tube can well concentrate all stress of the Bowden tube on the plane where the gravity center of the Bowden tube is located. Therefore, the whole stress of the Bowden tube is relatively stable, and the local deflection of the Bowden tube during use can be reduced. The Bowden tube can be moved along a preset movement track, so that the accuracy of pressure gauge detection is improved.

Further, the connector is provided with a mounting hole, a part of the connecting section is bent, the second end of the connecting section is inserted into the mounting hole, and the second end of the connecting section is coaxial with the mounting hole.

In particular, in the present invention, the connecting section is smoothly transitioned to the helical section and the connecting section is smoothly transitioned to the second end of the connecting section. Therefore, the connection section is hardly constituted by a simple arc section. The part of the connecting section is made into a bending structure, so that the connection of the connecting section from the mounting hole to the spiral section is realized.

Further, the transmission mechanism comprises a connecting piece, a part of the movable section is bent, the second end of the movable section is connected with the connecting piece, and the second end of the movable section is coaxial with the connecting piece.

Specifically, in the present invention, the active segment is smoothly transitioned to the spiral segment, and the active segment is smoothly transitioned to the second end of the active end. Thus, the movable segment is difficult to be constituted by an arc segment. Therefore, the part of the invention provided with the movable section is made into a bending structure, thereby realizing the connection of the movable section from the transmission mechanism to the spiral section.

Further, still include the watchcase, the joint include connector and connecting block, the connecting block be located the watchcase, connector one end be connected with the connecting block, the other end of connector wears out the watchcase and is connected with waiting to detect the medium.

The watchcase is of a disc-shaped structure, and the connector is arranged along the axial direction of the watchcase.

Further, the connector is provided with a first channel for guiding in a medium, the connecting block is provided with a guiding hole, and the guiding hole is communicated with the first channel.

Further, the connecting block is provided with a mounting hole, the connecting block is provided with a second channel, and the second channel is communicated with the guide hole and the mounting hole.

The second end of the connecting section is arranged in the mounting hole.

Further, the mounting hole is positioned on a first plane parallel to the dial plate, the guide hole is positioned on a second plane parallel to the dial plate, and the first plane and the second plane are parallel to each other.

Specifically, an included angle exists between the second channel and the plane of the dial plate.

The invention relates to a mechanical meter, wherein a dial plate and a pointer are arranged in a meter shell, a series of pressure values are arranged on the surface of the dial plate, and the pointer points to the pressure values.

Further, the case of the corresponding side of the dial is made of transparent material, and the user can observe the dial through the case.

Further, the transmission mechanism comprises a connecting piece and a sector wheel, the connecting piece is provided with a mounting groove, and the second end of the movable section is mounted in the mounting groove.

Specifically, the second end of the movable section is of a closed structure, and the medium cannot leak from the Bowden tube movable section.

Further, the basic shape of the connecting piece is a hat shape.

The Bowden tube portion is inserted into the connector and is integral with the connector. In the prior art, the connectors to which the bourdon tubes are connected are usually plate-like or strip-like metal members. However, there is a problem in that the structural strength of the member itself is not strong, and the accuracy of the pressure gauge is impaired when deformation occurs during the force transmission. Even if the member is not deformed, it is subjected to a large stress, and it is impossible to achieve high durability millions of times. The connecting piece with the cap-shaped structure has high structural strength and high durability, and can be matched with a Bowden tube to realize the service life of millions of times.

Further, the sector wheel is arranged in the watch case through the first shaft part, the sector wheel can rotate around the first shaft part, and the sector wheel is used as a pointer.

Specifically, the pointer is connected with the second shaft member, the gear teeth are arranged on the periphery of the second shaft member, and the sector wheel is meshed with the gear teeth.

Further, the sector wheel is rotated about the first axis. The fan-shaped wheel cannot be directly driven to rotate by the movement of the connecting piece, and the fan-shaped wheel is driven to rotate by the connecting piece through the movable connecting rod.

Specifically, the movable connecting rod is rotationally connected with the connecting piece, and the movable connecting rod is rotationally connected with the fan-shaped wheel.

Further, a shaft part III is arranged on the connecting piece, and the movable connecting rod is connected with the connecting piece through the shaft part III. The shaft piece III is positioned on a central extension line of the mounting end of the Bowden tube connected with the connecting piece.

When the Bowden tube is stressed and deformed, the connection mode and the position relation of the Bowden tube, the connecting piece and the shaft piece III can well transmit the force of the mounting end of the Bowden tube to the shaft piece III. In comparison with other prior art connections and positional relationships, the direction of movement of the components changes during the transfer from the bourdon tube to the connection to the shaft three, which results in a loss of force throughout the process. The position of the shaft element III is positioned on the central extension line of the mounting end, so that the loss of force in the force transmission process is very small, and the detection precision of the pressure gauge is further improved. And the small deformations of the bourdon tube can be transferred to the pointer. Therefore, the invention has smaller deformation quantity of the Bowden tube when detecting the same pressure, and also has better fatigue durability.

Further, the distance between the first shaft element and the center of the end face of the mounting end is equal to the distance between the first shaft element and the third shaft element.

In the whole transmission mechanism, the force applied by the mounting end of the Bowden tube is transmitted to the sector wheel rotating around the first shaft element, and the sector wheel rotationally drives the second shaft element meshed with the sector wheel to rotate. The fan-shaped wheel taking the first shaft part as the rotating base shaft has the same force transmission distance as the fan-shaped wheel, and can well transmit the deformation of the Bowden tube to the fan-shaped wheel. The bourdon tube has smaller deformation and better fatigue durability.

Further, a shaft piece IV is arranged on the sector wheel, and the movable connecting rod is connected with the connecting piece through the shaft piece IV. And the engagement points of the fourth shaft element, the first shaft element and the sector wheel with the second shaft element are basically positioned on a straight line.

The above-described arrangement is such that the force-receiving locations of the sector wheel are substantially in a straight line. And further, the sector wheel is stable in motion, so that the abrasion of the sector wheel in the long-term use process is avoided, and the service life is prolonged. The loss of force in the transmission process is reduced, and the detection accuracy of the pressure gauge is improved.

The invention optimizes the structure of the Bowden tube and reduces the friction force of the transmission mechanism during movement by matching with the optimized transmission mechanism, thereby avoiding the abrasion of the transmission mechanism and improving the durability of the pressure gauge.

Further, a base is arranged in the watch case, and the base is fixedly arranged in the watch case.

Further, the first shaft member and the second shaft member are respectively arranged on the base. The shaft is rotatable relative to the base. The positions of the first shaft element and the second shaft element are limited, and the axial direction of the first shaft element and the second shaft element is ensured not to deviate, so that the movement of the sector wheel rotating around the first shaft element is ensured to be stable, and the movement of the pointer driven by the second shaft element is further ensured to be stable and accurate.

Further, the base comprises a first substrate and a second substrate, the first substrate is fixedly arranged on the second substrate, and the first substrate and the second substrate are parallel to each other.

Further, the first shaft member passes through the first base plate and the second base plate. The second shaft part penetrates through the first base plate and the second base plate.

Further, the sector wheel and the gear are arranged between the first base plate and the second base plate. The invention further ensures that the transmission of the transmission mechanism and the driving of the pointer movement are in the preset plane through the arrangement of the base, reduces the friction force of the invention in the whole movement and further prolongs the service life of the pressure gauge.

Drawings

The invention will be described in further detail below in connection with the drawings and the preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the invention. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the present invention;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a right side view of FIG. 2;

FIG. 5 is a cross-sectional view of section AA in FIG. 3;

FIG. 6 is a schematic view of the back structure of the present invention;

FIG. 7 is a cross-sectional view of section BB in bitmap 6;

fig. 8 is a schematic structural view of a transmission mechanism in the present invention.

Wherein, the reference numerals specifically explain as follows: 1a, a connector; 1b, connecting blocks; 2. a bourdon tube; 2a, a helical section; 2b, a connecting section; 2c, an active section; 2d, a mounting end; 3. a mounting hole; 4. a connecting piece; 5. a watch case; 6a, a first channel; 6b, a second channel; 7. an introduction hole; 8. a pointer; 9. a dial; 10. a sector wheel; 11. a first shaft member; 12. a second shaft member; 13. a gear; 14. a first substrate; 15. a second substrate; 16. a shaft member III; 17. a fourth shaft member; 18. a movable connecting rod.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 and 2: the utility model provides a Bowden tube 2 manometer, includes joint, bowden tube 2 and drive mechanism, bowden tube 2 include screw section 2a, and connect connecting section 2b and movable section 2c at screw section 2a both ends respectively, screw section 2 a's setting makes Bowden tube 2 after long-term use, still can resume initial state, effectively improves Bowden tube 2's life. The second end of the movable section 2c is connected with the transmission mechanism, the first end of the movable section 2c is connected with the spiral section 2a, the included angle between the plane of the movable section 2c and the axis of the spiral section 2a is smaller than 90 degrees, and the second end of the movable section 2c is close to the plane of the connecting section 2 b. The movable section 2c is structurally arranged such that even if the movable section 2c is subjected to the force of the expansion of the spiral section 2a, the second end of the movable section 2c is subjected to a force perpendicular to the movable section 2c. When the movable section 2c is connected with the transmission mechanism to transmit force, the transmission mechanism receives small friction force. Thereby effectively avoiding the abrasion of the transmission mechanism and improving the durability of the pressure gauge.

As shown in fig. 3 and 4, the present invention further provides that the second end of the connecting section 2b is connected to the joint, the first end of the connecting section 2b is connected to the spiral section 2a, and the second end of the connecting section 2b approaches the plane where the movable section 2c is located. When the screw segment 2a is forced to expand, the screw segment 2a is displaced in the axial direction, and the connecting segment 2b is forced outwardly along the axis of the screw segment 2a as a second force. And the included angle between the connecting section 2b and the second acting force is larger than 90 degrees, the second end of the connecting section 2b receives a small force perpendicular to the connecting section 2b compared with the included angle between the connecting section 2b and the second acting force being equal to or smaller than 90 degrees. In the use, connecting section 2b is connected steadily with the joint, and the joint can realize good leakproofness with connecting section 2 b's connection, avoids leading-in joint's medium to leak.

As shown in fig. 5, the first end of the connecting section 2b and the first end of the movable section 2c are respectively connected to two ends of the spiral section 2c, and the distance between the first end of the connecting section and the first end of the movable section 2c depends on the axial length of the spiral section. The second end of the connecting section 2b and the second end of the movable section 2c are positioned on the same plane.

In the operating state of the bourdon tube 2, the second end of the connecting section 2b is subjected to the force of the joint and the second end of the movable section 2c is subjected to the force of the transmission mechanism. And the second end of the connecting section 2b and the second end of the movable section 2c are arranged on the same plane, that is, the stress of the two can be concentrated on the same plane.

The second end of the connecting section 2b and the gravity center of the spiral section 2a are positioned on the same plane. The second end of the movable section 2c and the gravity center of the spiral section 2a are positioned on the same plane. The structural arrangement of the Bowden tube 2 in the invention can well concentrate all the stress of the Bowden tube 2 on the plane where the center of gravity of the Bowden tube 2 is located. Therefore, the overall stress of the bourdon tube 2 is relatively stable, and the local deflection of the bourdon tube 2 during use can be reduced. The bourdon tube 2 can move along a preset moving track, so that the accuracy of pressure gauge detection is improved.

The connector is provided with a mounting hole 3, a part of the connecting section 2b is bent, the second end of the connecting section 2b is inserted into the mounting hole 3, and the second end of the connecting section 2b is coaxial with the mounting hole 3. In the present invention, the connection section 2b is smoothly transitioned to the spiral section 2a, and the connection section 2b is smoothly transitioned to the second end of the connection section 2 b. Therefore, the connecting section 2b is hardly constituted by a simple arc. The part of the invention provided with the connecting section 2b is made into a bending structure, thereby realizing the connection of the connecting section 2b from the mounting hole 3 to the spiral section 2 a.

The transmission mechanism comprises a connecting piece 4, a part of the movable section 2c is bent, the second end of the movable section 2c is connected with the connecting piece 4, and the second end of the movable section 2c is coaxial with the connecting piece 4. In the present invention, the movable section 2c is smoothly transitioned to the spiral section 2a, and the movable section 2c is smoothly transitioned to the second end of the movable end. Therefore, the movable section 2c is hardly constituted by one arc section. Therefore, the part of the invention where the movable section 2c is arranged is made into a bending structure, thereby realizing the connection of the movable section 2c from the transmission mechanism to the spiral section 2 a.

As shown in fig. 6 and 7, the multifunctional electric meter further comprises a meter case 5, the connector comprises a connector 1a and a connecting block 1b, the connecting block 1b is positioned in the meter case 5, one end of the connector 1a is connected with the connecting block 1b, and the other end of the connector 1a penetrates out of the meter case 5 to be connected with a medium to be tested. The watch case 5 is in a disc-shaped structure, and the connector 1a is arranged along the axial direction of the watch case 5.

The connector 1a is provided with a first channel 6a for leading in a medium, the connecting block 1b is provided with an leading-in hole 7, and the leading-in hole 7 is communicated with the first channel 6 a. The connecting block 1b is provided with a mounting hole 3, the connecting block 1b is provided with a second channel 6b, and the second channel 6b is communicated with the guide hole 7 and the mounting hole 3. The second end of the connecting section is arranged in the mounting hole 3. To this end, the medium can be led from the connection head 1a to the bourdon tube 2.

The mounting hole 3 is positioned on a first plane parallel to the dial 9, the leading-in hole 7 is positioned on a second plane parallel to the dial 9, and the first plane and the second plane are mutually parallel. In particular, the second channel 6b of the invention has an angle with the plane of the dial 9.

As shown in fig. 1, the invention is a mechanical watch, a dial 9 and a pointer 8 are arranged in the watch case 5, a series of pressure values are arranged on the surface of the dial 9, and the pointer 8 points to the pressure values. The case 5 on the corresponding side of the dial 9 is made of a transparent material, and the user can observe the dial 9 through the case 5.

The transmission mechanism comprises a connecting piece 4 and a sector wheel 10, wherein the connecting piece 4 is provided with a mounting groove, and the second end of the movable section 2c is mounted in the mounting groove. The second end of the movable section 2c is a closed structure and the medium does not leak from the movable section 2c of the bourdon tube 2. The basic shape of the connecting piece 4 is a hat shape. The Bowden tube 2 is partially inserted into the connector 4 and is integral with the connector 4. In the prior art, the connectors to which the bourdon tubes are connected are usually plate-like or strip-like metal members. However, there is a problem in that the structural strength of the member itself is not strong, and the accuracy of the pressure gauge is impaired when deformation occurs during the force transmission. Even if the member is not deformed, it is subjected to a large stress, and it is impossible to achieve high durability millions of times. The connecting piece 4 with the cap-shaped structure has high structural strength and high durability, and can be matched with a Bowden tube to realize the service life of millions of times.

As shown in fig. 5 and 8, the sector wheel 10 is mounted in the case 5 by a first shaft member 11, the sector wheel 10 is rotatable about the first shaft member 11, and the sector wheel 10 acts on the pointer 8. In the invention, the pointer 8 is connected with the second shaft member 12, the periphery of the second shaft member 12 is provided with gear teeth, and the sector wheel 10 is meshed with the gear teeth. The sector wheel 10 moves in rotation about the first shaft 11. The fan-shaped wheel 10 cannot be directly driven to rotate by the movement of the connecting piece 4, and the fan-shaped wheel 10 is driven to rotate by the connecting piece 4 through the movable connecting rod. The movable connecting rod is rotatably connected with the connecting piece 4, and the movable connecting rod is rotatably connected with the sector wheel 10.

The connecting piece 4 is provided with a shaft element III 16, and the movable connecting rod 18 is connected with the connecting piece 4 through the shaft element III 16. The third shaft member 16 is located on the central extension line of the mounting end 2d of the bourdon tube 2 connected to the connection member 4. When the Bowden tube 2 is deformed under force, the connection mode and the position relation of the Bowden tube 2, the connecting piece 4 and the shaft piece III 16 can well transmit the force of the mounting end 2d of the Bowden tube 2 to the shaft piece III 16. In comparison with other prior art connections and positions, the direction of movement of the components changes during the transfer from the bourdon tube 2 to the connection 4 to the shaft three 16, which results in a loss of force during the whole process. The position of the shaft element III 16 is positioned on the central extension line of the mounting end 2d, so that the loss of force in the force transmission process is very small, and the detection precision of the pressure gauge is further improved. And small deformations of the bourdon tube 2 can be transferred to the pointer. Therefore, the invention has the advantages of smaller deformation quantity, better fatigue durability and the like when detecting the same pressure.

The distance between the first shaft element 11 and the center of the end face of the mounting end 2d is equal to the distance between the first shaft element 11 and the third shaft element 16. In the whole transmission mechanism, the force applied by the mounting end 2d of the Bowden tube 2 is transmitted to the sector wheel 10 rotating around the first shaft member 11, and the sector wheel 10 rotationally drives the second shaft member 12 meshed with the sector wheel 10. The sector wheel 10 taking the first shaft part 11 as a rotation base shaft has the same force transmission distance as the sector wheel 10, and can well transmit the deformation of the Bowden tube 2 to the sector wheel 10. The bourdon tube 2 is less deformed and has better fatigue durability.

The sector wheel 10 is provided with a shaft piece IV 17, and the movable connecting rod 18 is connected with the connecting piece 4 through the shaft piece IV 17. The engagement points of the shaft piece IV 17, the shaft piece I11 and the sector wheel 10 and the shaft piece II 12 are basically positioned on the same straight line. The above arrangement allows the force-receiving positions of the sector wheel 10 to be substantially aligned. And further, the sector wheel 10 is stable in motion, abrasion of the sector wheel 10 in a long-term use process is avoided, and the service life is prolonged. The loss of force in the transmission process is reduced, and the detection accuracy of the pressure gauge is improved.

The invention optimizes the structure of the Bowden tube 2 and reduces the friction force of the transmission mechanism during movement by matching with the optimized transmission mechanism, thereby avoiding the abrasion of the transmission mechanism and improving the durability of the pressure gauge.

A base is arranged in the watch case 5, and the base is fixedly arranged in the watch case 5. The first shaft element 11 and the second shaft element 12 are respectively arranged on the base. The second shaft member 12 is rotatable relative to the base. The positions of the first shaft element 11 and the second shaft element 12 are limited, so that the axial direction of the first shaft element 11 and the second shaft element 12 is ensured not to deviate, the movement of the sector wheel 10 rotating around the first shaft element 11 is ensured to be stable, and the movement of the pointer 8 driven by the second shaft element 12 is further ensured to be stable and accurate.

The base comprises a first base plate 14 and a second base plate 15, wherein the first base plate 14 is fixedly arranged on the second base plate 15, and the first base plate 14 and the second base plate 15 are parallel to each other. The first shaft member 11 passes through the first base plate 14 and the second base plate 15. The second shaft member 12 passes through the first base plate 14 and the second base plate 15.

The sector wheel 10 and the gear 13 are arranged between the first base plate 14 and the second base plate 15. The invention further ensures that the transmission of the transmission mechanism and the movement of the driving pointer 8 are in the preset plane through the arrangement of the base, reduces the friction force of the invention in the whole movement and further prolongs the service life of the pressure gauge.

When the invention works, a medium is led into the Bowden tube 2 from the joint, and the medium entering the Bowden tube 2 is sequentially led into the connecting section 2b, the spiral section 2a and the movable section 2c. The Bowden tube 2 will be deformed by the force of the medium, which deformation is transmitted by the movable section 2c to the transmission mechanism and the pointer 8 is driven by the transmission mechanism to oscillate to indicate the pressure value.

The invention provides that the movable section 2c is not located on a plane perpendicular to the axis of the spiral section 2a, but that the movable section 2c is arranged on an inclined plane having an angle of less than 90 ° with the axis of the spiral section 2 a. So that the end of the second end that is connected to the transmission is closer to the plane of the connecting section 2 b. When the spiral section 2a is forced to expand, the spiral section 2a is displaced in the axial direction, and the movable section 2c is forced outwardly along the axis of the spiral section 2a as a first force. And the angle between the movable section 2c and the first acting force is greater than 90 degrees, the second end of the movable section 2c is subjected to a smaller force perpendicular to the movable section 2c than the angle between the movable section 2c and the first acting force is equal to or smaller than 90 degrees. When the movable section 2c is connected with the transmission mechanism to transmit force, the transmission mechanism receives smaller friction force. Thereby effectively avoiding the abrasion of the transmission mechanism and improving the durability of the pressure gauge. The invention has the characteristics of high durability and long service life, and the service life of the invention can reach more than one million times.

The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the invention that follows may be better understood, and in order that the present invention may be better understood. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims

1. The Bowden tube pressure gauge comprises a joint, a Bowden tube (2) and a transmission mechanism, and is characterized in that the Bowden tube (2) comprises a spiral section (2 a), and a connecting section (2 b) and a movable section (2 c) which are respectively connected to two ends of the spiral section (2 a), wherein the second end of the movable section (2 c) is connected with the transmission mechanism, the first end of the movable section (2 c) is connected with the spiral section (2 a), the included angle between the plane of the movable section (2 c) and the axis of the spiral section (2 a) is smaller than 90 degrees, and the second end of the movable section (2 c) is close to the plane of the connecting section (2 b);

the second end of the connecting section (2 b) is connected with the joint, the first end of the connecting section (2 b) is connected with the spiral section (2 a), and the second end of the connecting section (2 b) is close to the plane where the movable section (2 c) is located; the second end of the connecting section (2 b) and the second end of the movable section (2 c) are positioned on the same plane.

2. A bourdon tube manometer according to claim 1, characterized in that the second end of the connecting section (2 b) is in the same plane as the centre of gravity of the spiral section (2 a).

3. A bourdon tube pressure gauge as claimed in claim 1 or 2, characterized in that the second end of the movable section (2 c) is located in the same plane as the centre of gravity of the spiral section (2 a).

4. A bourdon tube pressure gauge as claimed in claim 1, characterized in that it further comprises a case (5), said joint comprising a joint head (1 a) and a joint block (1 b), said joint block (1 b) being located in the case (5), one end of said joint head (1 a) being connected to the joint block (1 b), the other end of the joint head (1 a) being connected to the medium to be tested by passing out of the case (5).

5. A bourdon tube pressure gauge as claimed in claim 4, characterized in that the connection head (1 a) is provided with a first passage (6 a) for introducing a medium, the connection block (1 b) is provided with an introduction hole (7), and the introduction hole (7) communicates with the first passage (6 a).

6. A bourdon tube pressure gauge as claimed in claim 5, characterized in that the connection block (1 b) is provided with a mounting hole (3), the connection block (1 b) is provided with a second channel (6 b), and the second channel (6 b) communicates the introduction hole (7) with the mounting hole (3).

7. A bourdon tube manometer according to claim 6, characterized in that the mounting hole (3) is located in a first plane parallel to the dial plate (9), the lead-in hole (7) is located in a second plane parallel to the dial plate (9), the first and second planes being parallel to each other.

8. A bourdon tube manometer according to claim 1, characterized in that the transmission comprises a coupling element (4) and a segment wheel (10), the coupling element (4) being provided with a mounting groove, the second end of the movable segment (2 c) being mounted in the mounting groove.