Barometer device

Abstract

The present invention provides a barometer device that can more accurately indicate atmospheric pressure. [Solution] The barometer device of this invention includes a cylinder, a piston, an elastic member, a rotating shaft, a dial, and a pointer. The cylinder includes an air port. The piston is movably mounted within the cylinder along a first axis. The piston has opposing first and second ends, and a rack located between the first and second ends and extending along the first axis, with the first end located near the air port. The elastic member is mounted within the cylinder and abuts the second end of the piston. The rotating shaft is rotatably mounted along the second axis through the cylinder. The rotating shaft has an annular toothed portion located within the cylinder and an end extending from the cylinder, the annular toothed portion meshing with the rack. The dial is located outside the cylinder, and the end of the rotating shaft passes through the center of the dial. The pointer is connected to the end of the rotating shaft and located above the dial. When gas enters the cylinder through the air inlet, the piston is pushed and moves along the first axis, compressing the elastic member, causing the piston rack to rotate the rotating shaft along the second axis, causing the pointer to rotate relative to the dial and indicate the corresponding air pressure value.

Description

[Technical Field]

[0001] The present invention relates to a barometer device, and more particularly to a barometer device that can more accurately indicate atmospheric pressure. [Background technology]

[0002] Conventional mechanical barometers are primarily designed using a Bourdon tube structure, which uses the bending deformation of the tube to drive a mechanical gear train and pointer to indicate the magnitude of pressure. However, the mechanism is complex and prone to damage, and the change curve of the Bourdon tube's load / deformation ratio value is nonlinear, making it difficult to convert into stable and precise mechanical movement to accurately indicate air pressure. How to provide a barometer that can more accurately indicate air pressure is a research direction in this field. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention provides a barometer device that can more accurately indicate atmospheric pressure. [Means for solving the problem]

[0004] The barometer device of the present invention includes a cylinder, a piston, an elastic member, a rotating shaft, a dial, and a pointer. The cylinder includes an air port. The piston is movably mounted within the cylinder along a first axis. The piston has opposing first and second ends, and a rack located between the first and second ends and extending along the first axis, with the first end located near the air port. The elastic member is mounted within the cylinder and abuts the second end of the piston. The rotating shaft is rotatably mounted along the second axis through the cylinder. The rotating shaft has an annular toothed portion located within the cylinder and an end extending from the cylinder, the annular toothed portion meshing with the rack. The dial is located outside the cylinder, and the end of the rotating shaft passes through the center of the dial. The pointer is connected to the end of the rotating shaft and located above the dial. When gas enters the cylinder through the air inlet, the piston is pushed and moves along the first axis, compressing the elastic member, causing the piston rack to rotate the rotating shaft along the second axis, causing the pointer to rotate relative to the dial and indicate the corresponding air pressure value.

[0005] In one embodiment of the present invention, the piston includes a limiting member located between the first end and the second end, the rack faces the limiting member, and a through-groove exists between the limiting member and the limiting member, the rotary shaft is installed through the through-groove, the limiting member abuts against the rotary shaft, and the ring teeth of the rotary shaft are continuously engaged with the rack during the movement of the piston.

[0006] In one embodiment of the present invention, the cylinder includes a first bore and a second bore, and the rotating shaft includes a cap, a first step, an annular tooth, a second step, and an end portion, which are arranged in sequence. The cap is located outside the cylinder, and the size of the cap is larger than the size of the first bore, the first step is installed through the first bore, the limiting member abuts the first step of the rotating shaft, the second step is installed through the second bore, and the size of the end portion is smaller than the size of the second bore.

[0007] In one embodiment of the present invention, the second end of the piston has a shape that is a combination of an arc and a secant, and there is a platform, and there is a flat surface within the cylinder corresponding to the platform, so that the piston can move within the cylinder only along the first axis.

[0008] In one embodiment of the present invention, the above-mentioned barometer device further includes a cover, the cylinder has an opening away from the air port, the cover is threadedly connected to the cylinder to seal the opening, and the elastic member is abutted between the cover and the second end of the piston, and the compression amount of the elastic member is adjusted by adjusting the depth at which the cover is threadedly connected to the cylinder. The cover has a triangular adjustment hole on its outer surface located at the central axis, and a corresponding wrench can be used to rotate the cover and easily adjust the compression amount of the elastic member by manual or automated equipment.

[0009] In one embodiment of the present invention, the above-mentioned barometer device further includes a chassis connected to the barrel and positioned between the barrel and the dial, the rotating shaft passing through the chassis, and the dial being removably mounted on the chassis.

[0010] In one embodiment of the present invention, the chassis includes a regular polygonal center latch (a regular square in the embodiment of this specification), and the scale includes a regular polygonal center hole corresponding to the center latch.

[0011] In one embodiment of the present invention, the chassis and the cylinder are integral.

[0012] In one embodiment of the present invention, the above-mentioned barometer device further includes a sealing ring mounted on the first end of the piston and abutting against the inner wall surface of the cylinder, the sealing ring having a circular cross section.

[0013] In one embodiment of the present invention, the above-mentioned barometer device further includes an air nozzle and a buckle. The air nozzle protrudes from the cylinder and communicates with the air port. The buckle is located near the air nozzle and is used to connect to equipment that needs to measure barometric pressure. [Effects of the Invention]

[0014] Based on the above, the piston of the barometer device of the present invention includes a rack extending along a first axis. An elastic member is installed within the barrel and abuts against the second end of the piston. A rotating shaft is rotatably installed through the barrel along a second axis, with the annular teeth of the rotating shaft engaging with the rack. A dial is located outside the barrel, with the end of the rotating shaft passing through the center of the dial. A pointer is connected to the end of the rotating shaft and located above the dial. Therefore, when gas enters the barrel through the air inlet, the piston is pushed and moves along the first axis, compressing the elastic member. The rack of the piston rotates the rotating shaft along the second axis, causing the pointer to rotate relative to the dial and indicating the corresponding air pressure value. The elastic member is in the form of a cylindrical compression spring, and its load / deformation ratio curve is linear. The precision transmission of the rack and gear minimizes mechanical conversion errors, allowing for accurate air pressure readings. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of a barometer device according to an embodiment of the present invention; [Figure 2]3 is a schematic view of a barometer device according to an embodiment of the present invention viewed from another viewing angle; FIG. [Figure 3] FIG. 2 is an exploded schematic view of the barometer device of FIG. 1. [Figure 4] 2 is an exploded schematic view of the barometer device of FIG. 1 at a different viewing angle. [Figure 5] FIG. 2 is a three-dimensional cross-sectional view of the barometer device of FIG. 1. [Figure 6] 2 is a plan view of another cross section of the barometer device of FIG. 1. [Figure 7] FIG. 2 is a schematic diagram of a piston of the barometer device of FIG. 1. [Figure 8] FIG. 2 is a schematic cross-sectional view of a local portion of the barometer device of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0016] 1 and 2 are schematic diagrams of a barometer device according to one embodiment of the present invention, viewed from different angles. Referring to FIGS. 1 and 2, the barometer device 100 of this embodiment is used to connect to a device requiring measurement of atmospheric pressure (not shown, such as, but not limited to, a tire) and can accurately measure the atmospheric pressure of the device requiring measurement. This will be described in detail below.

[0017] Figure 3 is an exploded schematic view of the barometer device of Figure 1. Figure 4 is an exploded schematic view of partial members of the barometer device of Figure 1 from a different viewing angle. Figure 5 is a three-dimensional cross-sectional view of the barometer device of Figure 1. Figure 6 is a plan view of another cross section of the barometer device of Figure 1. Figure 7 is a schematic view of a piston of the barometer device of Figure 1. Figure 8 is a partial cross-sectional schematic view of the barometer device of Figure 1.

[0018] 3 to 8, the barometer device 100 of this embodiment includes a cylinder body 110, a piston 120, an elastic member 130, a cover body 185, a rotating shaft 140, a dial 150, and a pointer 160.

[0019] As shown in Figure 6, the cylindrical body 110 includes an air port 111 (located to the left of the cylindrical body 110 in Figure 6) and an opening 115 (located to the right of the cylindrical body 110 in Figure 6) which face each other based on the second axis A2, and a first perforation 112 (located below the cylindrical body 110 in Figure 6) and a second perforation 113 (located above the cylindrical body 110 in Figure 6) which face each other based on the first axis A1.

[0020] 6 and 7, the piston 120 is installed in the cylindrical body 110 so as to be movable along the first axis A1, and the piston 120 includes a first end 121, a second end 122, and a rack 124 located between the first end 121 and the second end 122 and extending along the first axis A1. The first end 121 of the piston 120 is located near the air port 111.

[0021] Furthermore, as shown in Figures 7 and 8, the piston 120 includes a limiting member 125 located between the first end 121 and the second end 122, and the rack 124 faces the limiting member 125 and has a through groove 126 between it and the limiting member 125.

[0022] 3 and 6, the rotary shaft 140 is rotatably installed through the cylindrical body 110 along the second axis A2 and through the through groove 126. The rotary shaft 140 is interlocked with the pointer 160.

[0023] The rotating shaft 140 includes a cap portion 141, a first step portion 142, an annular tooth portion 143, a second step portion 144, and an end portion 145, which are arranged in sequence. The annular tooth portion 143 is located inside the cylindrical body 110, and the end portion 145 and the cap portion 141 are located outside the cylindrical body 110. The size of the cap portion 141 is larger than the size of the first perforation 112 of the cylindrical body 110, and the first step portion 142 is installed to pass through the first perforation 112. The second step portion 144 is installed to pass through the second perforation 113.

[0024] The barometer device 100 of this embodiment can precisely convert the linear movement of the piston 120 into the rotation of the pointer 160 by means of the combination of the mechanical rack 124 and the annular teeth 143 .

[0025] 8, the limiting member 125 abuts against the first step 142 of the rotating shaft 140, and the annular teeth 143 mesh with the rack 124. By abutting against the rotating shaft 140, the limiting member 125 ensures that the annular teeth 143 of the rotating shaft 140 continuously meshes with the rack 124 during the movement of the piston 120. In this way, the movement of the piston 120 is accurately converted into the rotation of the annular teeth 143 of the rotating shaft 140, and a situation in which the annular teeth 143 disengages from the rack 124 and the rack 124 is unable to fully drive the annular teeth 143 is avoided.

[0026] Specifically, in this embodiment, the cross section of the limiting member 125 is V-shaped. Due to the V-shaped cross section of the limiting member 125, the limiting member 125 has good structural strength, and when the annular teeth 143 of the limiting member 125 are pressed, a repulsive force is generated, which causes the annular teeth 143 to adhere tightly to the rack 124, more effectively preventing the annular teeth 143 from coming off the rack 124 or the existence of a gap between the rack 124 and the annular teeth 143 when the annular teeth 143 rotates, causing swinging and resulting in involuntary vibration of the pointer 160.

[0027] Furthermore, as shown in FIG. 4, the second end 122 of the piston 120 has a shape that combines an arc shape and a secant line, and has a platform 123. The cylindrical body 110 has a flat surface 114 that corresponds to the platform 123. This prevents the piston 120 from rotating and affecting the meshing state of the rack 124 and the annular teeth portion 143 when the piston 120 moves along the first axis A1 within the cylindrical body 110.

[0028] 6, the barometer device 100 further includes a seal ring 180, which is attached to the first end 121 of the piston 120 and abuts against the inner wall surface 116 of the cylindrical body 110. The seal ring 180 maintains close contact with the inner wall surface 116 of the cylindrical body 110 and can move within the cylindrical body 110 along with the piston 120. In the barometer device 100, the space between the first end 121 of the piston 120 and the air port 111, with the seal ring 180 as the boundary, forms a pressure chamber.

[0029] The seal ring 180 in this embodiment is designed with a circular cross section, which can match the contact area between the seal ring 180 and the cylindrical body 110 when the piston 120 moves left and right in Figure 6 along the first axis A1, and can match the friction force between the seal ring 180 and the inner wall surface 116 of the cylindrical body 110 when the piston 120 moves forward and backward along the first axis A1.

[0030] The barometer device 100 further includes a cover 185, which is threadedly connected to the barrel 110 to seal the opening 115 of the barrel 110, and an elastic member 130 is installed in the barrel 110 and abuts between the cover 185 and the second end 122 of the piston 120. In this embodiment, the elastic member 130 is, for example, a compression spring.

[0031] 3, the dial 150 is located outside the cylindrical body 110, and the end 145 of the rotating shaft 140 passes through a center hole 151 of the dial 150. The dial 150 is a disc-shaped object with a thickness of several micrometers to several millimeters, and the surface of the dial 150 is provided with numbers and atmospheric pressure unit symbols that can indicate atmospheric pressure values ​​by printing or engraving.

[0032] The pointer 160 is connected to the end 145 of the rotating shaft 140 and is positioned above the dial 150. The end 145 of the rotating shaft 140 is inserted into the hole 161 of the pointer 160 and fits tightly, and the tip 162 of the pointer 160 can rotate around the end 145 as its center / axis, thereby indicating the atmospheric pressure value on the dial 150.

[0033] In this embodiment, by adjusting the depth to which the cover body 185 is threadedly coupled to the cylindrical body 110, the compression amount of the elastic member 130 can be adjusted and the pointer 160 can be calibrated to an initial value. Specifically, the cover body 185 has an internal thread 186, and the cylindrical body 110 has an external thread 117 near the opening 115, and the internal thread 187 of the cover body 185 and the external thread 117 of the cylindrical body 110 are threadedly coupled together. By rotating the cover body 185, the position of the cover body 185 relative to the cylindrical body 110 can be changed, which adjusts the compression length of the elastic member 130 and further changes the position of the piston 120, thereby adjusting the angle between the rotation axis 140 and the pointer 160.

[0034] Furthermore, the barometer device 100 further includes an air nozzle 190 and a buckle 195. The air nozzle 190 protrudes from the cylindrical body 110 and connects the air port 111 (FIG. 6) with the pressure chamber. The buckle 195 is installed near the air nozzle 190 and is used to connect to equipment requiring atmospheric pressure measurement (not shown, for example, but not limited to, a tire). The air nozzle 190 is provided with a seal ring 182. When the buckle 195 is connected to the equipment requiring atmospheric pressure measurement, the air nozzle 190 is inserted into the connecting hole of the equipment requiring atmospheric pressure measurement and the seal ring 182 abuts against the inner wall surface of the connecting hole of the equipment requiring atmospheric pressure measurement, maintaining airtightness of the connection between the air nozzle 190 and the equipment requiring atmospheric pressure measurement.

[0035] In the initial installation state, the tip 162 of the pointer 160 is preset above the atmospheric pressure value of 0 (initial value) on the dial 150. The air nozzle 190 communicates with the pressure chamber, and when the air nozzle 190 is connected to the air pressure measurement device, the air pressure in the pressure chamber and the air pressure in the air pressure measurement device maintain synchronous changes. When the air pressure in the air pressure measurement device exceeds atmospheric pressure, gas enters the cylinder 110 through the air port 111, and the air pressure provides a thrust to the piston 120, pushing the piston 120 along the first axis A1. At this time, the elastic member 130 is compressed and deformed by being pressed by the second end 122 of the piston 120. The compressed and deformed elastic member 130 provides an elastic force in the opposite direction to the second end 122 of the piston 120. The position of the piston 120 remains stable and does not move until an equilibrium is reached between the thrust of the air pressure and the elastic force of the elastic member 130 in the opposite direction.

[0036] During this process, the rack 124 of the piston 120 rotates the rotating shaft 140 along the second axis A2, causing the pointer 160 to rotate above the dial 150. When the piston 120 comes to a stop, the rotation of the rotating shaft 140 correspondingly stops, and the pointer 160 stops rotating, allowing the accurate air pressure value to be displayed on the dial 150.

[0037] Furthermore, since the barometer device 100 is removable and the elastic member 130 and the dial 150 are replaceable components, when elastic fatigue failure occurs after a certain period of use, the elastic member 130 can be replaced to ensure the accuracy of the barometer device 100, and the elastic member 130 with a different elastic coefficient and the corresponding dial 150 can be replaced at the same time to change the pressure value range that the barometer can measure.

[0038] 3, the barometer device 100 further includes a chassis 170 connected to the barrel 110 and positioned between the barrel 110 and the dial 150. In this embodiment, the central axis of the chassis 170 is perpendicular to that of the barrel 110, and the chassis 170 has a through-hole 174 located on the central axis, which communicates with the internal space of the barrel 110 and corresponds to the center hole 151 of the dial 150. The end 145 of the rotating shaft 140 passes through the through-hole 174 of the chassis 170, the center hole 151 of the dial 150, and the hole 161 of the pointer 160.

[0039] The dial 150 is removably mounted on the chassis 170. The chassis 170 includes a regular polygonal center latch 172, and the dial includes a regular polygonal center hole 151 that corresponds to the center latch 172. This allows the dial 150 to maintain a constant position and orientation relative to the chassis 170.

[0040] In this embodiment, the dial 150 and the chassis 170 are designed separately, allowing the dial 150 to be rotated relative to the chassis 170 or to be replaced with another dial 150. This allows for the provision of a barometer device 100 with a dial 150 having a different orientation or a different scale, and the same manufacturing line and materials can be used, thereby saving materials and simplifying the manufacturing process.

[0041] Furthermore, in this embodiment, the chassis 170 and the cylindrical body 110 are integral, which makes manufacturing easy and eliminates the need for separate assembly, and also allows for effective reduction in size.

[0042] The barometer device 100 further includes a meter cover 165 mounted on the chassis 170, with the dial 150 and the pointer 160 located between the chassis 170 and the meter cover 165. The meter cover 165 is, for example, transparent, which makes it easy to identify the position of the pointer 160 and can protect the pointer 160 and the dial 150.

[0043] As described above, the piston of the barometer device of the present invention includes a rack extending along a first axis. The elastic member is installed within the barrel and abuts against the second end of the piston. The rotating shaft is rotatably installed within the barrel along the second axis, with the annular teeth of the rotating shaft engaging with the rack. The dial is located outside the barrel, with the end of the rotating shaft passing through the center of the dial. The pointer is connected to the end of the rotating shaft and located above the dial. Therefore, when gas enters the barrel through the air inlet, the piston is pushed and moves along the first axis, compressing the elastic member. The rack of the piston rotates the rotating shaft along the second axis, causing the pointer to rotate relative to the dial and indicate the corresponding atmospheric pressure. [Industrial Applicability]

[0044] The present invention relates to a barometer device that can more accurately indicate atmospheric pressure. [Explanation of symbols]

[0045] A1: 1st axis A2: 2nd axis 100: Barometer device 110: Cylinder 111:Air vent 112: 1st perforation 113:Second drilling 114: Plane 115:Aperture 116: Inner wall surface 117: Male thread 120: Piston 121: 1st end 122: 2nd end 123: Platform 124: Rack 125: Limited parts 126:Through groove 130: Elastic member 140: Rotation axis 141: Cap part 142: First stage 143: Annular tooth 144: Second stage 145:End 150: Scale 151: Center hole 160: Guidelines 161: Hole 162: Tip 165: Meter cover 170: Chassis 172: Center latch 174:Through hole 180, 182: Seal ring 185: Cover body 186: Female thread 187: Adjustment hole 190: Air nozzle 195: Buckle

Claims

1. a cylinder including an air port; a piston disposed within the cylinder so as to be movable along a first axis, the piston including opposing first and second ends and a rack located between the first and second ends and extending along the first axis, the first end being located near the air port; an elastic member disposed within the cylindrical body and in contact with the second end of the piston; a rotating shaft that is rotatably mounted on the cylindrical body along a second axis and includes an annular toothed portion located within the cylindrical body and an end portion extending from the cylindrical body, the annular toothed portion meshing with the rack; a scale located outside the cylinder, the end of the rotation shaft passing through its center; a pointer connected to the end of the rotary shaft and positioned above the dial, interlocking with the rotary shaft and having a tip that rotates around the end as an axis; When gas enters the cylinder through the air port, the piston is pushed to move along the first axis, the elastic member is compressed, and the rack of the piston rotates the rotation shaft along the second axis, thereby rotating the pointer relative to the dial and indicating a corresponding atmospheric pressure value.

2. 2. The barometer device according to claim 1, wherein the piston includes a limiting member located between the first end and the second end, the rack faces the limiting member, a through groove exists between the rack and the limiting member, the rotating shaft is installed through the through groove, the limiting member abuts against the rotating shaft, and the annular teeth of the rotating shaft are continuously engaged with the rack during the movement of the piston.

3. 3. The barometer device of claim 2, wherein the cylindrical body includes a first bore and a second bore, the rotating shaft includes a cap portion, a first step portion, the annular teeth portion, a second step portion, and the end portion, which are arranged in sequence, the cap portion being located outside the cylindrical body, the dimension of the cap portion being larger than the dimension of the first bore, the first step portion being installed through the first bore, the limiting member abutting the first step portion of the rotating shaft, the second step portion being installed through the second bore, and the dimension of the end portion being smaller than the dimension of the second bore.

4. 2. The barometer device of claim 1, wherein the second end of the piston has a shape that is a combination of an arc and a secant, a platform is present, and a flat surface corresponding to the platform is present within the cylindrical body, and the piston is allowed to move within the cylindrical body only along the first axis.

5. 2. The barometer device of claim 1, further comprising a cover body having a triangular adjustment hole, wherein the cylindrical body includes an opening spaced from the air port, the cover body is threadedly coupled to the cylindrical body to seal the opening, the elastic member abuts between the cover body and the second end of the piston, and the compression amount of the elastic member is adjusted by adjusting the depth to which the cover body is threadedly coupled to the cylindrical body.

6. 2. The barometer device of claim 1, further comprising a chassis connected to the barrel and positioned between the barrel and the dial, the rotation shaft passing through the chassis, and the dial being removably mounted on the chassis.

7. 7. The barometer device according to claim 6, wherein the chassis includes a center latch having a regular polygonal shape, and the dial includes a center hole corresponding to the regular polygonal shape of the center latch.

8. 7. The barometer device according to claim 6, wherein the chassis and the cylindrical body are integral.

9. 2. The barometer device according to claim 1, further comprising a seal ring attached to the first end of the piston and abutting against an inner wall surface of the cylindrical body, the seal ring having a circular cross section.

10. 2. The barometer device according to claim 1, further comprising an air nozzle and a buckle, wherein the air nozzle is installed to protrude from the cylindrical body and communicates with the air port, and the buckle is installed near the air nozzle and is used for connecting to equipment that requires measurement of atmospheric pressure.

Images