Pressure gauge

Abstract

The present invention relates to a pressure gauge, including a case, a dial, a pointer, and a conversion structure, wherein an introduction hole is provided at the bottom of the case; the characteristics are as follows: the conversion structure includes a transmission shaft, which is constrained in the case and can rotate around its own axis, a first transmission tooth portion is provided on the outer peripheral wall of the transmission shaft, and the upper end of the transmission shaft is fixed to the pointer; a transmission seat, which is arranged in the case and can move up and down, can move up under the driving of the air pressure introduced from the introduction hole, and a vertically arranged rack portion is provided on the transmission seat; a support spring acts on the transmission seat and keeps it moving down to block the introduction hole; a transmission plate, which is rotatably arranged in the case and can swing left and right, a second transmission tooth portion meshing with the first transmission tooth portion is provided on the upper part of the transmission plate, and a gear portion meshing with the rack portion is provided on the lower part of the transmission plate. It has the advantages of compact structure, shockproof and drop-resistant, high detection accuracy, and the pointer is not easy to shake due to external force.

Description

Technical Field

[0001] The invention relates to a pressure gauge for detecting air pressure. The pressure gauge is suitable for various products requiring air pressure detection, such as a hand-pulled air pump, an electric air pump, an inflatable tent, an inflatable boat, etc. Background Art

[0002] The working principle of the pressure gauge is that the pressure deformation is transmitted to the pointer through the elastic deformation of the sensitive elements (Bourdon tube, diaphragm box, bellows) in the gauge, and then the conversion mechanism of the movement in the gauge transmits the pressure deformation to the pointer, causing the pointer to rotate to display the pressure. The spring tube (Bourdon tube) is divided into type tube, coil spring tube, spiral tube and other types. Generally, the cold-hardened material blank tube is used. It has high plasticity in the annealed state. After cold-hardening and qualitative treatment by pressure processing, it obtains high elasticity and strength. Under the action of the inner 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 measurement range of the spring tube is generally in the diaphragm. The sensitive element is a circular diaphragm with waves. One side of the diaphragm is subjected to the pressure of the measuring medium. In this way, the slight bending deformation of the diaphragm can be used to indirectly measure the pressure of the medium, and the pressure is displayed by the pointer. Compared with the Bourdon tube, the diaphragm has a larger transmission force. Since the edges around the diaphragm itself are fixed, it has better vibration resistance. The diaphragm pressure gauge can achieve very high overpressure protection (for example, the diaphragm is attached to the upper flange). The diaphragm can also be added with a protective coating to improve corrosion resistance. By using open flanges, flushing, openings and other measures, the diaphragm pressure gauge can be used to measure highly viscous, unclean and crystalline media. The pressure measurement range of the diaphragm pressure gauge is 1600Pa~2.5MPa.

[0003] Currently, there is a pressure gauge on the market that detects air pressure through a threaded transmission structure. The transmission part is mainly composed of two parts: a transmission shaft and a transmission seat. Through the threaded cooperation between the transmission shaft and the transmission seat, the transmission seat can be driven by the air pressure introduced from the introduction hole and move up and down under the action of the support spring, which is converted into the rotation of the transmission shaft, and finally drives the pointer to rotate. In order to reduce resistance, a transmission shaft with a larger pitch is required, which makes the transmission unstable, the pointer is easy to shake when subjected to external force, the pointer's indication accuracy is low, and the anti-seismic effect is extremely poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pressure gauge with compact structure, shock resistance and drop resistance, high detection accuracy and a pointer that is not easily shaken by external forces, in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a pressure gauge, including a case, a dial placed in the case, a pointer, and a conversion structure that transmits pressure deformation to the pointer to cause the pointer to rotate, and the bottom of the case is provided with an introduction hole for introducing external pressure and acting on the conversion structure; the characteristic is that: the conversion structure includes

[0006] A transmission shaft is axially constrained in the case and can rotate around its own axis, a first transmission tooth portion is provided on the outer peripheral wall of the transmission shaft, and the upper end of the transmission shaft passes through the dial and is fixed to the pointer;

[0007] A transmission seat is arranged in the watch case and can move up and down. The transmission seat can move up under the driving of the air pressure introduced from the introduction hole. The transmission seat is provided with a vertically arranged rack portion;

[0008] The supporting spring acts on the transmission seat and keeps the transmission seat moving downward to block the introduction hole;

[0009] A transmission plate is rotatably arranged in the watch case and can swing left and right. The upper part of the transmission plate is provided with a second transmission tooth portion meshing with the first transmission tooth portion, so that the swing of the transmission plate can drive the transmission shaft to rotate clockwise or counterclockwise around its own axis. The lower part of the transmission plate is provided with a gear portion meshing with the rack portion, so that the up and down movement of the transmission seat can drive the transmission plate to swing left and right.

[0010] Preferably, the transmission plate has a fan-shaped base plate and a protruding block portion located below the base plate and protruding forward, the second transmission tooth portion is an end face tooth formed on the upper end face of the base plate in an arc-shaped layout; the side of the protruding block portion is in an arc shape, and the teeth of the gear portion are arranged on the side of the protruding block portion; the transmission portion protrudes upward on the upper part of the transmission seat, and the transmission portion is provided with a rectangular hole penetrating along the front-to-back direction, the rack portion is arranged on the inner side wall of the rectangular hole, and the gear portion extends into the rectangular hole. The aforementioned transmission plate has a reasonable structural layout, the end face teeth in an arc-shaped layout are conducive to meshing with the first transmission tooth portion on the transmission shaft, and the gear portion extends into the rectangular hole, so that the internal components of the case are compactly arranged, and the pressure gauge can be made very small.

[0011] Further improvement, the above-mentioned watch case is composed of an outer shell, an inner shell, a mounting seat and an upper cover made of a transparent material, the inner shell is embedded in the outer shell, the mounting seat is fixed on the top surface of the inner shell, the transmission shaft is mounted on the mounting seat, the dial is placed and fixed on the upper end surface of the mounting seat, the transmission seat is constrained in the concave cavity provided in the inner shell, the transmission plate is mounted in the concave cavity of the inner shell through a pin shaft, the support spring is located in the concave cavity of the inner shell, the upper end of the support spring is supported on the top wall of the concave cavity of the inner shell, the lower end of the support spring is supported on the transmission seat, and the introduction hole is provided at the bottom of the outer shell. The watch case structure is convenient for production and manufacturing, and it is convenient to assemble various components in the watch case.

[0012] In order to facilitate the installation of the transmission plate and the reasonable layout of various components, a mounting hole communicating with the inner shell cavity is opened on the upper end surface of the inner shell, the transmission part extends into the mounting hole, and the transmission plate is installed in the mounting hole through a pin shaft.

[0013] In order to ensure that the transmission seat only slides up and down under the action of external pressure, a guide groove is opened on the hole wall of the above-mentioned installation hole, and the transmission part can slide up and down by being inserted into the guide groove.

[0014] As an improvement, the inner end of the pointer is provided with a support member with a top surface in the shape of a sharp cone, the upper end of the transmission shaft is inserted into the support member, the inner surface of the upper cover is provided with a conical hole matching the top surface of the support member, and the support member is inserted into the conical hole. The pointed cone-shaped support member has an axial restraining effect on the conical hole, and at the same time, has a guiding effect on the rotation of the transmission shaft, and the resistance to the rotation of the pointer is small.

[0015] As a further improvement, a sealing gasket made of rubber material is provided in the above-mentioned shell, and the sealing gasket is pressed by the inner shell to the bottom surface of the inner cavity of the shell, and the middle part of the sealing gasket is fixed under the transmission seat and can move up and down with the transmission seat. It forms a diaphragm pressure gauge, and the sealing gasket plays the role of transmitting pressure and at the same time plays the role of air sealing.

[0016] In order to facilitate the connection of the pressure gauge to related equipment, such as an air pump, the lower part of the above-mentioned shell has a threaded connection column extending downward, and the introduction hole is arranged on the threaded connection column.

[0017] Compared with the prior art, the advantages of the present invention are as follows: the conversion structure in the pressure gauge is mainly composed of three parts: a transmission shaft, a transmission seat and a transmission plate. The transmission seat can move up and down under the joint action of the air pressure introduced from the introduction hole and the support spring. Under the action of the rack part and the gear part, the up and down movement of the transmission seat can drive the transmission plate to swing left and right. Under the action of the first transmission tooth part and the second transmission tooth part, the transmission plate swings left and right to drive the transmission shaft to rotate around its own axis, and finally drives the pointer to rotate. The conversion structure is simple and reasonable; the amplitude of the up and down movement of the transmission seat is related to the level of the introduced air pressure, and the amplitude of the swing of the transmission plate is related to the upper and lower amplitudes of the transmission seat. The amplitude of the downward movement is related to the amplitude of the transmission shaft movement, the amplitude of the transmission shaft rotation is related to the swing amplitude of the transmission plate, the amplitude of the pointer swing is related to the amplitude of the transmission shaft rotation, so that the level of the introduced air pressure is related to the amplitude of the pointer swing, so that the air pressure can be accurately detected. In addition, the various components are connected by gear transmission, which has good transmission stability, so that the pressure gauge has good shock resistance and is not easily damaged even if it falls to the ground; the entire conversion structure involves few components and a compact layout, so the pressure gauge can be made very small and has strong applicability. It can be placed in the valve of a rubber boat or on the handle of a hand-pulled air pump for use. The structure of each component is simple, the coordination relationship is small, and the cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the three-dimensional structure of the inner shell in an embodiment of the present invention;

[0020] Figure 3 is a cross-sectional view of an embodiment of the present invention;

[0021] Figure 4 For the embodiment of the present invention Figure 2 AA section view;

[0022] Figure 5 It is a three-dimensional exploded view of an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 5 Shown is a preferred embodiment of the present invention.

[0025] A pressure gauge comprises a case 1, a dial 2 placed in the case 1, a pointer 4, and a conversion structure for transmitting pressure deformation to the pointer 4 to cause the pointer 4 to rotate. The dial 2 is provided with a pressure scale. The bottom of the case 1 is provided with an introduction hole 111 for introducing external pressure and acting on the conversion structure.

[0026] The main improvement of the present invention is that the conversion structure includes

[0027] The transmission shaft 3 is axially constrained in the watch case 1 and can rotate around its own axis. A first transmission tooth portion 31 is provided on the outer peripheral wall of the transmission shaft 3. The upper end of the transmission shaft 3 passes through the dial 2 and is fixed to the pointer 4.

[0028] The transmission seat 5 is arranged in the watch case 1 and can move up and down. The transmission seat 5 is located below the transmission shaft 3. The transmission seat 5 can move upward under the driving force of the air pressure introduced from the introduction hole 111. The transmission seat 5 is provided with a vertically arranged rack portion 511.

[0029] The supporting spring 6 acts on the transmission seat 5 and makes the transmission seat 5 keep moving downward to block the introduction hole 111.

[0030] The transmission plate 7 is rotatably arranged in the watch case 1 and can swing left and right. The upper part of the transmission plate 7 is provided with a second transmission tooth portion 711 meshing with the first transmission tooth portion 31, so that the swing of the transmission plate 7 can drive the transmission shaft 3 to rotate clockwise or counterclockwise around its own axis. The lower part of the transmission plate 7 is provided with a gear portion 721 meshing with the rack portion 511, so that the up and down movement of the transmission seat 5 can drive the transmission plate 7 to swing left and right.

[0031] The transmission plate 7 in this embodiment has a fan-shaped base plate portion and a protruding block portion 72 located below the base plate portion 71 and protruding forward. The second transmission tooth portion 711 is an end face tooth with an arc-shaped layout formed on the upper end surface of the base plate portion 71; the side surface of the protruding block portion 72 is arc-shaped, and the teeth of the gear portion 721 are arranged on the side surface of the protruding block portion 72; the upper part of the transmission seat 5 protrudes upward, and the transmission portion 51 is provided with a rectangular hole 52 penetrating along the front and rear directions. The rack portion 511 is arranged on the inner side wall of the rectangular hole 52, and the gear portion 721 extends into the rectangular hole 52.

[0032] The watch case 1 in this embodiment is composed of an outer shell 11, an inner shell 12, a mounting seat 13 and an upper cover 14 made of a transparent material. The inner shell 12 is embedded in the outer shell 11, the mounting seat 13 is fixed on the top surface of the inner shell 12, the transmission shaft 3 is mounted on the mounting seat 13, the dial 2 is placed and fixed on the upper end surface of the mounting seat 13, the transmission seat 5 is constrained in a concave cavity provided in the inner shell 12, the transmission plate 7 is installed in the concave cavity of the inner shell 12 through the pin 9, the support spring 6 is located in the concave cavity of the inner shell 12, the upper end of the support spring 6 is supported on the top wall of the concave cavity of the inner shell 12, the lower end of the support spring 6 is supported on the transmission seat 5, and the introduction hole 111 is provided at the bottom of the outer shell 11.

[0033] The upper end surface of the inner shell 12 is provided with a mounting hole 121 which communicates with the concave cavity of the inner shell 12, the transmission part 51 extends into the mounting hole 121, and the transmission plate 7 is installed in the mounting hole 121 through the pin 9. A guide groove 122 is provided on the hole wall of the mounting hole 121, and the transmission part 51 can slide up and down when inserted into the guide groove 122.

[0034] The inner end of the pointer 4 is provided with a support member 41 with a pointed cone-shaped top surface. The upper end of the transmission shaft 3 is inserted into the support member 41. The inner surface of the upper cover 14 is provided with a conical hole 141 matching the top surface of the support member 41. The support member 41 is inserted into the conical hole 141.

[0035] A sealing gasket 8 made of rubber material is arranged in the outer shell 11, and the sealing gasket 8 is pressed on the bottom surface of the inner cavity of the outer shell 11 by the inner shell 12. The middle part of the sealing gasket 8 is fixed under the transmission seat 5 and can move up and down with the transmission seat 5. The lower part of the outer shell 11 has a threaded connection column 112 extending downward, and the introduction hole 111 is arranged on the threaded connection column 112.

[0036] All components in this embodiment can be made of anti-brittle plastic material.

[0037] The working principle and process of this pressure gauge are as follows:

[0038] The conversion structure in this pressure gauge is mainly composed of three parts: a transmission shaft 3, a transmission seat 5 and a transmission plate 7. The transmission seat 5 can move up and down under the joint action of the air pressure introduced from the introduction hole 111 and the support spring 6. The greater the air pressure, the longer the distance the transmission seat 5 moves up.

[0039] Under the action of the rack part 511 and the gear part 721 , the up and down movement of the transmission base 5 can drive the transmission plate 7 to swing left and right. The longer the upward movement distance of the transmission base 5 is, the greater the swing amplitude of the transmission plate 7 is.

[0040] Under the action of the first transmission tooth portion 31 and the second transmission tooth portion 711, the transmission plate 7 swings left and right, driving the transmission shaft 3 to rotate around its own axis, and finally driving the pointer 4 to rotate. The greater the swing amplitude of the transmission plate 7, the greater the angle of rotation of the pointer 4 along with the transmission shaft 3, and the larger the displayed scale value.

[0041] When the air pressure is low, the upward movement distance of the transmission seat 5 is short, and the angle of rotation of the pointer 4 is finally small, and the scale value displayed on the dial 2 is also small. In the absence of other states, the transmission seat 5 is reset under the action of the supporting spring 6, the pointer 4 is reset, and the scale value displayed on the dial 2 is zero.

[0042] The amplitude of the up and down movement of the transmission seat 5 is related to the level of the introduced air pressure, the amplitude of the swinging of the transmission plate 7 is related to the amplitude of the up and down movement of the transmission seat 5, the amplitude of the rotation of the transmission shaft 3 is related to the swinging amplitude of the transmission plate 7, and the amplitude of the swinging of the pointer 4 is related to the rotation amplitude of the transmission shaft 3, so that the level of the introduced air pressure is related to the swinging amplitude of the pointer 4, so that the air pressure can be accurately detected. In addition, the various components are connected by gear transmission, which has good transmission stability, so that the pressure gauge has good shock resistance and is not easily damaged even if it falls to the ground; the entire conversion structure involves few components and a compact layout, so the pressure gauge can be made very small and has strong applicability. It can be placed in the valve of a rubber boat or on the handle of a hand-pulled air pump for use. The structure of each component is simple, the coordination relationship is small, and the cost is greatly reduced.

[0043] It should be noted that in the description of this embodiment, the terms "front, rear", "left, right", "up, down", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A pressure gauge, comprising a case (1), a dial (2) placed in the case (1), a pointer (4), and a conversion structure for transmitting pressure deformation to the pointer (4) to cause the pointer (4) to rotate, wherein the bottom of the case (1) is provided with an introduction hole (111) for introducing external pressure and acting on the conversion structure; characterized in that: The conversion structure includes A transmission shaft (3) is axially constrained in the watch case (1) and can rotate around its own axis. A first transmission tooth portion (31) is provided on the outer peripheral wall of the transmission shaft (3). The upper end of the transmission shaft (3) passes through the dial (2) and is fixed to the pointer (4). A transmission seat (5) is arranged in the watch case (1) and can move up and down. The transmission seat (5) can move upward under the driving force of the air pressure introduced from the introduction hole (111). A rack portion (511) arranged vertically is provided on the transmission seat (5); A support spring (6) acts on the transmission seat (5) to keep the transmission seat (5) moving downward to block the introduction hole (111); A transmission plate (7) is rotatably arranged in the watch case (1) and can swing left and right. The upper part of the transmission plate (7) is provided with a second transmission tooth portion (711) meshing with the first transmission tooth portion (31), so that the swing of the transmission plate (7) can drive the transmission shaft (3) to rotate clockwise or counterclockwise around its own axis. The lower part of the transmission plate (7) is provided with a gear portion (721) meshing with the rack portion (511), so that the up and down movement of the transmission seat (5) can drive the transmission plate (7) to swing left and right. The transmission plate (7) comprises a fan-shaped base plate portion and a protruding block portion (72) located below the base plate portion (71) and protruding forward; the second transmission tooth portion (711) is an end face tooth formed on the upper end face of the base plate portion (71) and arranged in an arc shape; the side face of the protruding block portion (72) is in an arc shape; the teeth of the gear portion (721) are arranged on the side face of the protruding block portion (72); the upper part of the transmission seat (5) is an upwardly protruding transmission portion (51); the transmission portion (51) is provided with a rectangular hole (52) penetrating in the front-rear direction; the rack portion (511) is arranged on the inner side wall of the rectangular hole (52); and the gear portion (721) extends into the rectangular hole (52).

2. The pressure gauge according to claim 1, characterized in that: The watch case (1) is composed of an outer shell (11), an inner shell (12), a mounting seat (13) and an upper cover (14) made of a transparent material. The inner shell (12) is embedded in the outer shell (11), the mounting seat (13) is fixed on the top surface of the inner shell (12), the transmission shaft (3) is mounted on the mounting seat (13), the dial (2) is placed and fixed on the upper end surface of the mounting seat (13), the transmission seat (5) is constrained in a concave cavity provided in the inner shell (12), the transmission plate (7) is mounted in the concave cavity of the inner shell (12) through a pin shaft (9), the support spring (6) is located in the concave cavity of the inner shell (12), the upper end of the support spring (6) is supported on the top wall of the concave cavity of the inner shell (12), the lower end of the support spring (6) is supported on the transmission seat (5), and the introduction hole (111) is provided at the bottom of the outer shell (11).

3. The pressure gauge according to claim 2, characterized in that: The upper end surface of the inner shell (12) is provided with a mounting hole (121) which communicates with the concave cavity of the inner shell (12); the transmission part (51) extends into the mounting hole (121); and the transmission plate (7) is mounted in the mounting hole (121) via a pin shaft (9).

4. The pressure gauge according to claim 3, characterized in that: A guide groove (122) is provided on the hole wall of the mounting hole (121), and the transmission part (51) can slide up and down when inserted into the guide groove (122).

5. The pressure gauge according to claim 2, characterized in that: The inner end of the pointer (4) is provided with a support member (41) whose top surface is in the shape of a pointed cone, the upper end of the transmission shaft (3) is inserted into the support member (41), the inner surface of the upper cover (14) is provided with a conical hole (141) matching the top surface of the support member (41), and the support member (41) is inserted into the conical hole (141).

6. The pressure gauge according to claim 2, characterized in that: A sealing gasket (8) made of rubber material is arranged inside the outer shell (11). The sealing gasket (8) is pressed onto the bottom surface of the inner cavity of the outer shell (11) by the inner shell (12). The middle part of the sealing gasket (8) is fixed below the transmission seat (5) and can move up and down with the transmission seat (5).

7. The pressure gauge according to claim 2, characterized in that: The lower part of the housing (11) has a threaded connection column (112) extending downward, and the introduction hole (111) is arranged on the threaded connection column (112).

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