WO2016008278A1

WO2016008278A1 - Pressure gauge

Info

Publication number: WO2016008278A1
Application number: PCT/CN2015/000481
Authority: WO
Inventors: 梅迪契⋅伽艾塔诺
Original assignee: 格力休闲体育用品有限公司
Priority date: 2014-07-18
Filing date: 2015-07-01
Publication date: 2016-01-21
Also published as: CN104236784A; CN104236784B

Abstract

Provided is a pressure gauge, comprising a gauge housing (1), a dial (2), a pointer (4), and a conversion structure for transforming the pressure and transmitting same to the pointer (4) to cause the pointer (4) to rotate; the conversion structure comprises a drive rod (3) capable of rotation, a drive base (5) capable of up-and-down motion, and a support spring (6); the pointer (4) is fixed to the upper end of the drive rod (3); the drive base (5) can be driven by air pressure to move upward; the drive base (5) is provided with a guide hole (51) for setting the drive rod (3); the support spring (6) is used in the drive base (5) for causing the drive base (5) to maintain a tendency of downward motion. The conversion structure of the present pressure gauge is simple and rational, and the screw thread fitting drive has good drive stability, such that the pressure gauge has good shockproof performance; there is no need for a complex lever structure or gear structure, thus the pressure gauge can be made very small; the structures of the components are simple, there are few mating relationships, and costs are significantly reduced.

Description

Pressure gauge

Technical field

The present invention relates to a pressure gauge for detecting air pressure.

Background technique

The working principle of the pressure gauge is through the elastic deformation of the sensitive components (Bourdon tube, bellows, bellows) in the watch, and then the deformation mechanism of the movement inside the watch transmits the pressure deformation to the pointer, causing the pointer to rotate to display the pressure. Spring tube (Bourdon tube) is divided into type tube, coil spring tube, spiral tube, etc., generally adopts cold work hardening material blank tube, which has high plasticity in the annealed state, cold work hardening and qualitative treatment after pressure processing Get high elasticity and strength. Under the action of internal cavity pressure, the spring tube can easily convert the pressure into the elastic displacement of the free end of the spring tube by utilizing its elastic characteristics. The measuring range of the spring tube is generally that the diaphragm sensitive component is a circular diaphragm with a wave, and the diaphragm side is subjected to the pressure of the measuring medium, so that the slight bending deformation generated by the diaphragm can be used to indirectly measure the pressure of the medium, the pressure The size is displayed by the pointer. The diaphragm has a larger transmission force than the Bourdon tube, and its vibration-proof property is better because the peripheral edge of the diaphragm itself is fixed. The diaphragm pressure gauge can achieve high overpressure protection (such as the diaphragm attached to the upper flange), the diaphragm can also be coated with a protective coating to improve corrosion resistance, using open flanges, flushing, openings, etc. Diaphragm pressure gauges measure very viscous, unclean and crystalline media. Pressure gauges for diaphragm gauges range from 1600 Pa to 2.5 MPa.

Pressure gauges mainly include bellows type pressure gauges, spring type pressure gauges, bellows type pressure gauges, shockproof pressure gauges, digital pressure gauges, and the like.

The structure of the bellows type pressure gauge is mainly composed of a membrane box and a transmission amplifying mechanism. The bellows is a round box-shaped pressure-sensing element made of an alloy. When subjected to pressure changes, it will expand or contract and displace. After the transmission and amplification of the lever system, the pointer indicates on the grooved dial. Measure the value of micro pressure or micro negative pressure. Membrane pressure gauges can also be powered with contacts for control and protection.

The structure of the spring tube type pressure gauge, such as the Chinese utility model patent "miniature spring tube pressure gauge" whose patent number is ZL200920199778.4 (publication number CN201527321U), discloses such a spring tube pressure gauge structure. In the circular outer casing, there is a spring elbow (made of a common-slotted phosphor bronze pipe or a seamless steel pipe) having an elliptical cross section (the long axis of the ellipse is parallel to the central axis of the needle), and one end thereof is a fixed end. The other end is a closed free end, the free end is connected with the connecting rod, the other end of the connecting rod is a sector gear, the sector gear is connected with the pinion gear on the central shaft, and the pointer of the pressure gauge is fixed on the central shaft. When the special spring tube is subjected to the pressure of the medium (such as gas), the free end is moved outward, and then the connecting rod drives the sector gear and the pinion to rotate, so that the pointer rotates clockwise by an angle. The greater the pressure of the medium, the greater the angle of rotation of the pointer. At this time, the scale value indicated by the pointer on the dial of the pressure gauge is the value of the measured air pressure. When the pressure is reduced, the spring bends will contract inward, returning the pointer to the appropriate position. When the pressure disappears, the spring bend returns to its original shape, and with the help of the hairspring, the pointer returns to the starting point (zero position). The spring tube type pressure gauge has the advantages of compact structure, high precision, wide measuring range and convenient use, and is often used to measure the pressure value of the medium in the drum, the header and the pipeline.

Due to the complicated structure of the transmission part, the existing pressure gauge structure has a large volume of the pressure gauge, and has high requirements on material requirements and manufacturing precision, resulting in high cost, and the seismic effect of the lever or gear transmission structure is extremely poor. If the pressure gauge falls on the bottom surface, its lever or gear transmission will be damaged.

Summary of the invention

The technical problem to be solved by the present invention is to provide a pressure gauge that is shockproof and resistant to falling, low in cost, simple in structure, and small in size, in view of the above state of the art.

The technical solution adopted by the present invention to solve the above technical problem is: a pressure gauge comprising a watch case, a dial placed in the case, a pointer, and a conversion structure for transmitting pressure deformation to the pointer to cause the pointer to rotate, the case The bottom of the bottom is provided with an introduction hole for introducing external pressure and acting on the conversion structure;

The utility model is characterized in that the conversion structure comprises a transmission rod axially constrained in the watch case and rotatable about its own axis, the transmission rod is provided with a transmission external thread, and the pointer is fixed to the upper end of the transmission rod: the transmission seat is arranged at The inside of the case can move up and down, the transmission seat can be moved up by the air pressure introduced from the introduction hole, and the transmission seat is provided with a guiding hole, the transmission rod is disposed in the guiding hole, and the hole wall of the guiding hole is provided a transmission internal thread that cooperates with the external thread of the transmission; a support spring acts on the transmission seat and keeps the transmission seat down.

In order to facilitate the forming process of the transmission seat, the guiding hole on the transmission base is a perforation, and the bottom of the guiding hole is provided with a bottom plate shielding, and the upper end surface of the bottom plate is in contact with the bottom surface of the transmission base. Of course, the guiding hole can also be a blind hole, that is, the bottom plate and the transmission seat are integrally formed together, but the processing is inconvenient.

The case is composed of an outer cover made of a casing, an inner casing and a transparent material, the inner casing is embedded in the outer casing, the transmission seat is disposed in the concave cavity of the inner casing, and the dial rests on the upper end surface of the inner casing, and is An upper cover that is disposed at an upper end opening of the outer casing is pressed, and a lower end of the transmission rod passes through the inner casing and is disposed in the guiding hole, and the elastic supporting spring is located in a cavity of the inner casing, and the upper end of the supporting spring is supported On the top wall of the cavity of the inner casing, the lower end of the support spring is supported on the transmission seat, and the introduction hole is provided at the bottom of the casing. The case structure is easy to manufacture and it is convenient to equip the components in the case.

The upper end surface of the inner casing is provided with a stepped through hole communicating with the inner casing cavity, the upper portion of the transmission rod has a step portion, and the lower end of the transmission rod passes through the stepped through hole of the inner casing and is disposed through the stepped through hole In the guide hole, at the same time, the step on the transmission rod rests on the bottom surface of the large hole portion of the stepped through hole. The stepped through hole and the stepped pair on the transmission stalk have an axial restraining action to ensure that the transmission rod can only rotate along its own axis and cannot move up and down under the external pressure.

The watch case is composed of an outer cover made of a casing, an inner casing and a transparent material. The inner casing is embedded in the outer casing, and the transmission seat is disposed in the concave cavity of the inner casing, and the dial rests on the upper end surface of the inner casing. And being pressed by an upper cover that is disposed at an upper end opening of the outer casing, the upper end surface of the inner casing is provided with a stepped through hole communicating with the inner casing cavity, and an upper portion of the transmission rod has a step portion, and the transmission rod is The lower end passes through the stepped through hole of the inner casing and is disposed in the guiding hole, and at the same time, the transmission The stepped portion on the rod rests on the bottom surface of the large hole portion of the stepped through hole, the support spring is located in the cavity of the inner casing, and the upper end of the support spring is supported on the top wall of the cavity of the inner casing to support the lower end of the spring Supported on the drive base, the introduction hole is provided at the bottom of the outer casing. Simultaneously

The top surface of the transmission rod has an upwardly convex tapered portion, and the inner surface of the upper cover is provided with a tapered hole matching the tapered portion, and the tapered portion is disposed in the tapered hole. The tapered portion has an axial restraining effect on the tapered hole and at the same time has a guiding effect on the rotation of the transmission rod.

The pointer is integrally formed with the transmission rod to form a single piece.

The outer peripheral surface of the transmission seat is in contact with the inner wall of the inner cavity of the inner casing to form a gas seal, and the peripheral wall of the transmission seat is provided with an axially disposed guiding groove, and the inner wall of the inner cavity of the inner casing is provided with an axially disposed guiding rib. The guiding ribs are inserted in the guiding grooves and can be relatively slipped. The transmission seat of the structure is similar to the piston structure, and the transmission seat structure can ensure a good gas seal and the cost is low.

The bottom surface of the transmission base has a concave ring groove, and the outer side wall of the ring groove forms a tooth portion that is everted and contacts the inner wall of the inner cavity of the inner casing. By the elastic contact between the tooth portion and the inner wall of the inner cavity of the inner casing, the outer circumferential surface of the transmission seat and the inner wall of the inner cavity of the inner casing form a gas sealing effect to prevent leakage.

The outer casing is provided with a breathable sheet made of rubber material, and the breathable sheet is pressed between the outer casing and the inner casing, and the transmission seat and the bottom plate are placed on the upper end surface of the breathable sheet. It forms a diaphragm type pressure gauge that acts to conduct pressure while the breather sheet acts as a gas seal.

To facilitate connection of the pressure gauge to an associated device, such as an air pump, the lower portion of the outer casing has a downwardly extending threaded connection post on which the introduction aperture is disposed.

The advantages of the present invention over the prior art are:

The conversion structure in the pressure gauge is mainly composed of two parts of the transmission rod and the transmission base, and through the threaded engagement between the transmission rod and the transmission base, the transmission seat can be driven by the air pressure introduced from the introduction hole and the support spring. Move up, convert into the rotary motion of the transmission rod, and finally drive the pointer to rotate;

The conversion structure is simple and reasonable, and the threaded transmission has good transmission stability, so that the pressure gauge has good anti-vibration effect, and even if it falls to the ground, it is not easy to be damaged;

In addition, the transmission method does not require a complicated lever structure or a gear structure, so the pressure gauge can be made small and has high applicability, and can be placed in the valve of the rubber boat or used on the handle of the hand cylinder;

At the same time, the structure of each component is simple, the coordination relationship is small, and the cost is greatly reduced.

DRAWINGS

1 is a schematic perspective view of a first embodiment of the present invention;

Figure 2 is a perspective view showing the three-dimensional structure of the transmission base in the first embodiment of the present invention;

Figure 3 is a cross-sectional view showing a first embodiment of the present invention;

Figure 4 is an exploded perspective view of the first embodiment of the present invention;

Figure 5 is a perspective view showing the structure of a second embodiment of the present invention;

Figure 6 is a cross-sectional view showing a second embodiment of the present invention;

Figure 7 is an exploded perspective view of a second embodiment of the present invention;

Figure 8 is a perspective view showing a three-dimensional structure of a third embodiment of the present invention;

Figure 9 is a cross-sectional view showing a third embodiment of the present invention;

Figure 10 is an exploded perspective view of a third embodiment of the present invention.

detailed description

The invention will be further described in detail below with reference to the embodiments of the drawings.

1 to 4 show a first embodiment of the present invention.

A pressure gauge includes a watch case 1, a dial 2 placed in the case 1, a pointer 4, and a switching structure that conducts pressure deformation to the pointer 4 to cause the pointer 4 to rotate.

A pressure scale is provided on the dial 2, and the bottom of the case 1 is provided with an introduction hole 111 for introducing and applying external pressure to the conversion structure.

The conversion structure includes a transmission rod 3 axially constrained in the watch case 1 and rotatable about its own axis. The transmission rod 3 is provided with a transmission external thread 31, the transmission external thread 31 has a large pitch, and the pointer 4 and the upper end of the transmission rod 3 are provided. fixed.

The transmission base 5 is disposed in the watch case 1 and can move up and down. The transmission base 5 can be moved up by the air pressure introduced from the introduction hole 111. The transmission base 5 is provided with a guide hole 51 through which the transmission rod 3 is disposed. In the 51, the wall of the hole of the guide hole 51 is provided with a transmission internal thread 511 which cooperates with the external thread 31 of the transmission. The guide hole 51 on the transmission base 5 is a through hole, and the bottom of the guide hole 51 is shielded by the bottom plate 7. The upper end surface of the bottom plate 7 is in contact with the bottom surface of the transmission base 5, and the bottom plate 7 can be fixed to the bottom of the transmission base 5.

The support spring 6 acts on the transmission base 5 and keeps the transmission base 5 down. The support spring 6 is a spring which is calculated based on the pressure required by the pressure gauge.

The case 1 in this embodiment is composed of a casing 11, an inner casing 12 and an upper cover 13 made of a transparent material. The upper cover 13 may be a glass plate, and the inner casing 12 is embedded in the casing 11, and the transmission seat 5 is disposed inside. In the cavity of the casing 12, the dial 2 rests on the upper end surface of the inner casing 12, and is pressed by the upper cover 13 which is provided at the opening of the upper end of the casing 11, and the lower end of the transmission rod 3 passes through the inner casing 12 and is then passed through In the guiding hole 51, the spring 6 is located in the cavity of the inner casing 12, the upper end of the supporting spring 6 is supported on the top wall of the cavity of the inner casing 12, and the lower end of the supporting spring 6 is supported on the transmission seat 5, the casing 11 The lower portion has a downwardly extending threaded connection post 112 on which the introduction aperture 111 is disposed.

The top surface of the transmission rod 3 has an upwardly convex tapered portion 33. The inner surface of the upper cover 13 is provided with a tapered hole 131 matching the tapered portion 33. The tapered portion 33 is inserted into the tapered hole 131. . The pointer 4 is integrally formed with the transmission rod 3 to form an integral piece.

The outer peripheral surface of the transmission base 5 in this embodiment is in contact with the inner wall of the inner cavity 12 to form a hermetic seal. The peripheral wall of the transmission base 5 is provided with an axially disposed guiding groove 52, and the inner wall of the inner casing 12 is provided with a shaft. To the set guide ribs 122, The guide ribs 122 are inserted into the guide grooves 52 and are relatively slidable. The bottom surface of the transmission base has a concave annular groove 53, and the outer side wall of the annular groove 53 forms a tooth portion 531 which is everted and contacts the inner wall of the inner casing 5. The transmission seat of this structure is similar to the piston structure, and the transmission seat structure can ensure good airtightness and low cost of the product.

All of the components in this embodiment can be made of a plastic material that is resistant to cracking.

5 to 7, it is a second embodiment of the present invention.

The difference between this embodiment and the first embodiment is that the upper end surface of the inner casing 12 is provided with a stepped through hole 121 communicating with the cavity of the inner casing 12, and the upper portion of the transmission rod 3 has a step portion 32 for the transmission rod 3 The lower end passes through the stepped through hole 121 of the inner casing and is bored in the guide hole 51, while the stepped portion 32 on the transmission rod 3 rests on the bottom surface of the large hole portion of the stepped through hole 121. The outer casing 11 is provided with a breathable sheet 8 made of a rubber material, and the breathable sheet 8 is pressed between the outer casing 11 and the inner casing 12, and the transmission base 5 and the bottom plate 7 rest on the upper end surface of the breathable sheet 8. It forms a diaphragm type pressure gauge that acts to conduct pressure while the breather sheet acts as a gas seal.

In this embodiment, the respiratory sheet is made of rubber material, and all other components can be made of a plastic material that is resistant to brittle cracking.

8 to 10 show a third embodiment of the present invention.

This embodiment differs from the second embodiment in that the shape of the outer casing 11 is slightly different from that of the second embodiment, and the lower portion of the outer casing 11 is not provided with a downwardly extending threaded connecting post 112, which is only at the upper portion of the outer casing 11. An external thread 113 is provided.

The conversion structure in the pressure gauge of the present invention is mainly composed of two parts of the transmission rod 3 and the transmission base 5, and through the threaded engagement between the transmission rod 3 and the transmission base 5, the transmission base 5 can be driven by the air pressure introduced from the introduction hole 111. And the lower upper movement under the action of the support spring 6 is converted into the rotary motion of the transmission rod 3, and finally the rotary motion of the pointer 4 is driven;

When the air pressure is large, the distance that the transmission base 5 moves up is long, the angle of rotation of the pointer 4 is large, and the displayed scale value is also large;

When the air pressure is small, the distance moved by the transmission base 5 is short, the angle of rotation of the pointer 4 is small, and the displayed scale value is also small, and there is no other state;

The drive base 5 is reset by the support spring 6, the pointer 4 is reset, and the displayed scale value is zero.

The conversion structure is simple and reasonable, and the threaded transmission has good transmission stability, so that the pressure gauge has good seismic effect and does not require complicated lever structure or gear structure. Therefore, the pressure gauge can be made small and has high applicability and can be placed. The rubber boat is used in the valve of the rubber boat or on the handle of the hand pump. At the same time, the structure of each component is simple, the cooperation relationship is small, and the cost is greatly reduced.

Claims

A pressure gauge comprising a case (1), a dial (2) placed in the case (1), a pointer (4), and a deformation of the pressure to the pointer (4) to cause the pointer (4) to rotate. In the conversion structure, the bottom of the case (1) is provided with an introduction hole (111) for introducing and applying external pressure to the conversion structure;

The conversion structure includes

The transmission rod (3) is axially constrained in the case (1) and rotatable about its own axis, and the transmission rod (3) is provided with a transmission external thread (31), the pointer (4) and the transmission rod (3) Fixed at the upper end;

The transmission base (5) is disposed in the case (1) and can move up and down, the transmission seat (5) can be moved up by the air pressure introduced from the introduction hole (111), and the transmission seat (5) is provided with a guide hole (51), the transmission rod (3) is disposed in the guiding hole (51), the wall of the guiding hole (51) is provided with a transmission internal thread (511) that cooperates with the external thread (31) of the transmission;

The support spring (6) acts on the drive seat (5) and keeps the drive seat (5) down.
The pressure gauge according to claim 1, characterized in that: the guiding hole (51) on the transmission base (5) is a perforation, and the bottom of the guiding hole (51) is provided with a bottom plate (7) for shielding, the bottom plate (7) The upper end surface is in contact with the bottom surface of the transmission base (5).
The pressure gauge according to claim 2, characterized in that the watch case (1) is composed of an outer casing (11), an inner casing (12) and an upper cover (13) made of a transparent material, and the inner casing (12) Embedded in the outer casing (11), the transmission seat (5) is disposed in the cavity of the inner casing (12), and the dial (2) rests on the upper end surface of the inner casing (12) and is covered by The upper cover (13) at the opening of the upper end of the outer casing (11) is pressed, and the lower end of the transmission rod (3) passes through the inner casing (12) and is inserted into the guiding hole (51), the spring supporting spring ( 6) in the cavity of the inner casing (12), the upper end of the support spring (6) is supported on the top wall of the cavity of the inner casing (12), and the lower end of the support spring (6) is supported on the transmission seat (5) The introduction hole (111) is provided at the bottom of the outer casing (11).
The pressure gauge according to claim 3, wherein the upper end surface of the inner casing (12) is provided with a stepped through hole (121) communicating with the cavity of the inner casing (12), and the transmission rod (3) The upper portion has a stepped portion (32) through which the lower end of the transmission rod (3) passes through the stepped through hole (121) of the inner casing and is inserted through the guide hole (51), and at the same time, the transmission rod ( 3) The upper step portion (32) rests on the bottom surface of the large hole portion of the stepped through hole (121).
A pressure gauge according to claim 3 or 4, characterized in that the top surface of the transmission rod (3) has an upwardly convex tapered portion (33) on the inner surface of the upper cover (13) A tapered hole (131) is provided to match the tapered portion (33), and the tapered portion (33) is inserted into the tapered hole (131).
The pressure gauge according to claim 5, characterized in that the pointer (4) is integrally formed with the transmission rod (3) to form an integral piece.
The pressure gauge according to claim 3, characterized in that the outer peripheral surface of the transmission seat (5) is in contact with the inner wall of the inner cavity of the inner casing (12) to form a hermetic seal, and the peripheral wall of the transmission base (5) is opened. An axially disposed guiding groove (52), the inner wall of the inner cavity of the inner casing (12) is provided with axially disposed guiding ribs (122), and the guiding ribs (122) are inserted in the guiding grooves (52) and can Relative slip.
The pressure gauge according to claim 7, characterized in that the bottom surface of the transmission seat (5) has a concave annular groove (53), and the outer side wall of the annular groove (53) is formed to be everted and inner (5) The inner portion of the cavity is in contact with the tooth portion (531).
The pressure gauge according to claim 3, wherein the outer casing (11) is provided with a breathable sheet (8) made of rubber material, and the breath sheet (8) is pressed against the outer casing (11) and the inner casing. Between (12), the transmission base (5) and the bottom plate (7) rest on the upper end surface of the respiratory sheet (8).
The pressure gauge according to claim 3, characterized in that the lower portion of the outer casing (11) has a downwardly extending threaded connection post (112), and the introduction hole (111) is disposed on the threaded connection post (112) on.