Compact pressure gauge

Abstract

A compact pressure gauge comprises a gauge shell, a movement and a spring tube, a central positioning seat and a side positioning seat which are integrated are arranged in the gauge shell, and a U-shaped groove and an air inlet hole are formed in one side of the side positioning seat; the machine core comprises an upper supporting plate and a lower supporting plate, the lower supporting plate is arranged on the center positioning base, and the edge of the bottom face of the upper supporting plate is attached to the side positioning base. The open end of the spring tube is fixed with the U-shaped connecting block; the U-shaped connecting block and the upper supporting plate are integrally formed, the U-shaped connecting block is arranged in the U-shaped groove in a matched mode, and a through hole is machined in the middle of the U-shaped connecting block, communicated with an inner cavity of the spring pipe and corresponds to the air inlet hole. According to the pressure gauge structure, the integrated U-shaped connecting block is arranged on the side portion of the upper supporting plate of the movement and used for positioning the bourdon tube, the integrated center positioning base and the integrated side positioning base are arranged in the gauge shell and used for replacing a connector to be connected with the movement, the U-shaped connecting block is inserted into the U-shaped groove in the side positioning base in a matched mode, the bourdon tube can be communicated with the air inlet hole, the structure is compact, and use is convenient. Positioning is accurate, and installation is more convenient.

Description

Technical Field

[0001] The utility model relates to a compact pressure gauge. Background Art

[0002] A pressure gauge is a device that uses an elastic element as a sensor to measure and display pressure above ambient. It is widely used in nearly all industrial and scientific fields. It can be found in heating networks, oil and gas transmission, water and gas supply systems, and vehicle maintenance operations. Mechanical pressure gauges are particularly popular in industrial process control and measurement due to their high mechanical strength and ease of manufacture.

[0003] The structure of a pressure gauge generally includes components such as a case, a movement, a spring tube, and a joint. The two ends of the spring tube are respectively connected to the fan-shaped teeth in the movement and the air inlet hole on the joint. The existing pressure gauge case and joint are basically split structures. During installation, the movement, spring tube and joint are generally installed as an integral structure first, and then the whole is placed in the case for installation. Multiple screws are required to fix the joints of each component. The assembly is cumbersome, positioning is inconvenient, and the installation position is prone to deviation, which affects the measurement accuracy of the pressure gauge. Utility Model Content

[0004] In view of the deficiencies existing in the above problems, the utility model provides a compact pressure gauge.

[0005] To achieve the above-mentioned object, the present invention provides a compact pressure gauge, comprising a case, wherein an integrated center positioning seat is provided in the middle of the inner cavity of the case, a side positioning seat is provided on one side of the center positioning seat and extends to the inner side wall of the case, a positioning rod is provided on the center positioning seat, a connecting hole is machined on the upper portion of the side positioning seat, a U-shaped groove is machined on one side of the side positioning seat adjacent to the center positioning seat, and an air inlet is machined in the middle of the U-shaped groove;

[0006] The movement comprises an upper support plate and a lower support plate, wherein the lower support plate is placed on the central positioning seat, the positioning rod fits through the positioning hole on the lower support plate, the bottom edge of the upper support plate abuts against the side positioning seat, and a limiting hole is machined on the upper support plate corresponding to the connecting hole;

[0007] A spring tube, wherein the closed end of the spring tube is connected to the connecting rod on the movement, and the open end of the spring tube is fixed to the U-shaped connecting block;

[0008] The U-shaped connecting block is integrally formed with the upper support plate, and the U-shaped connecting block is placed in the U-shaped groove. A through hole is processed in the middle of the U-shaped connecting block and is connected to the inner cavity of the spring tube. The position of the through hole corresponds to the air inlet.

[0009] As a further improvement of the present invention, the lower support plate has a concave structure and its two side edges are riveted to the upper support plate through positioning sleeves. A gear shaft and a connecting shaft are also provided between the upper support plate and the lower support plate. A hairspring is provided on the gear shaft, and a sector-shaped tooth is provided on the connecting shaft to engage with the gear shaft. The other end of the sector-shaped tooth is hinged to the connecting rod.

[0010] As a further improvement of the present invention, a dial is provided above the movement, a pointer is installed after the top end of the gear shaft passes through the center hole in the middle of the dial, a limit rod is provided on the bottom surface of the dial, and the limit rod cooperates and extends into the positioning sleeve.

[0011] As a further improvement of the present invention, a groove is machined in the middle of the center positioning seat to avoid the bottom end of the gear shaft.

[0012] As a further improvement of the present invention, a slot is processed on the inner side of the bottom of the U-shaped groove and extends through the bottom of the watch case. The bottom of the U-shaped connecting block extends downward to form an insert plate, and the insert plate is inserted into the slot.

[0013] As a further improvement of the present invention, a sealing groove is processed in the middle of the U-shaped groove and outside the air inlet hole, and an O-ring is built into the sealing groove.

[0014] As a further improvement of the present invention, the depth of the sealing groove is smaller than the thickness of the O-ring, and the outer wall of the U-shaped connecting block abuts against the O-ring.

[0015] As a further improvement of the present invention, the upper opening of the U-shaped groove is chamfered.

[0016] As a further improvement of the present invention, the end of the positioning rod is chamfered.

[0017] The beneficial effects of the utility model are:

[0018] The pressure gauge structure is configured such that an integrated U-shaped connecting block is provided on the side of the upper support plate of the movement to position the spring tube. The closed end of the spring tube is hinged to the fan-shaped teeth through a connecting rod, and the open end of the spring tube is welded and fixed to the U-shaped connecting block. A through hole is provided in the middle of the U-shaped connecting block to communicate with the inner cavity of the spring tube. The spring tube and the movement form an integral structure. The position of the spring tube is unique and the positioning is more accurate. In addition, an integrated central positioning seat and side positioning seat are provided in the watch case to replace the joint and the movement connection. A positioning rod is provided on the central positioning seat to pass through the positioning hole of the lower support plate of the movement. The side positioning seat is provided with a connecting hole corresponding to the limiting hole of the upper support plate of the movement and fixed with screws. The U-shaped connecting block with the spring tube is inserted into the U-shaped groove on the side positioning seat. The spring tube can be connected to the air inlet. The structure is compact and the positioning is accurate. The number of connecting screws is effectively reduced, and the installation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of a compact pressure gauge of the present utility model;

[0020] Figure 2 This is the assembly structure diagram of the pressure gauge after the dial 6 is removed;

[0021] Figure 3 is a front view of the watch case 1;

[0022] Figure 4 is a three-dimensional diagram of the watch case 1;

[0023] Figure 5 The assembly structure of the movement 3 and the spring tube 4 is three-dimensional Figure 1 ;

[0024] Figure 6 The assembly structure of the movement 3 and the spring tube 4 is three-dimensional Figure 2 ;

[0025] Figure 7 The upper support plate 31 is a three-dimensional Figure 1 ;

[0026] Figure 8 The upper support plate 31 is a three-dimensional Figure 2 ;

[0027] Figure 9 It is a three-dimensional view of the dial 6.

[0028] In the figure: 1. Case; 11. Center positioning seat; 12. Groove; 13. Positioning rod; 14. Side positioning seat; 15. Connecting hole; 16. U-shaped groove; 17. Slot; 18. Sealing groove; 19. Air inlet; 2. O-ring; 3. Movement; 31. Upper support plate; 311. Limiting hole; 32. Lower support plate; 321. Positioning hole; 33. Gear shaft; 35. Sector teeth; 36. Positioning sleeve; 37. Connecting shaft; 38. Connecting rod; 4. Spring tube; 5. U-shaped connecting block; 51. Through hole; 52. Insert plate; 6. Dial; 61. Center hole; 62. Limiting rod; 7. Pointer. DETAILED DESCRIPTION

[0029] like Figure 1-2 As shown, a compact pressure gauge described in the present utility model includes a case 1, which is injection molded as a whole. An integrated center positioning seat 11 is provided in the middle of the inner cavity of the case 1. A side positioning seat 14 is provided on one side of the center positioning seat 11 and extends to the inner wall of the case 1. A positioning rod 13 is provided on the center positioning seat 11. The end of the positioning rod 13 is chamfered. A connecting hole 15 is processed on the upper part of the side positioning seat 14. A U-shaped groove 16 is processed on one side of the side positioning seat 14 adjacent to the center positioning seat 11. The upper opening of the U-shaped groove 16 is chamfered, and an air inlet hole 19 is processed in the middle of the U-shaped groove 16 (see Figure 3 , Figure 4), a sealing groove 18 is machined in the middle of the U-shaped groove 16 and the outer side of the air inlet 19, and the O-ring 2 is built into the sealing groove 18. The depth of the sealing groove 18 is less than the thickness of the O-ring 2;

[0030] Movement 3, movement 3 includes an upper support plate 31 and a lower support plate 32, the lower support plate 32 is placed on the center positioning seat 11, the positioning rod 13 cooperates to pass through the positioning hole 321 on the lower support plate 32, the edge of the bottom surface of the upper support plate 31 is abutted against the side positioning seat 14, the upper support plate 31 is processed with a limiting hole 311 corresponding to the connecting hole 15, the lower support plate 32 is a concave structure and the edges on both sides are riveted to the upper support plate 31 through a positioning sleeve 36, a gear shaft 33 and a connecting shaft 37 are further provided between the upper support plate 31 and the lower support plate 32, a hairspring is provided on the gear shaft 33, and a sector tooth 35 is provided on the connecting shaft 37 to mesh with the gear shaft 33, and the other end of the sector tooth 35 is hinged to the connecting rod 38 (see Figure 5 , Figure 6 ), a dial 6 is provided above the movement 3, the top of the gear shaft 33 passes through the center hole 61 in the middle of the dial 6 and the pointer 7 is installed, and a limit rod 62 is provided on the bottom of the dial 6 (see Figure 9 ), the limiting rod 62 cooperates to extend into the positioning sleeve 36, and the groove 12 in the middle of the center positioning seat 11 is used to avoid the bottom end of the gear shaft 33;

[0031] Spring tube 4, the closed end of spring tube 4 is connected to the connecting rod 38 on the movement 3, and the open end of spring tube 4 is fixed to the U-shaped connecting block 5;

[0032] The U-shaped connecting block 5 is integrally formed with the upper support plate 31. The U-shaped connecting block 5 is fitted into the U-shaped groove 16. The outer wall of the U-shaped connecting block 5 abuts against the O-ring 2. A through hole 51 is machined in the middle of the U-shaped connecting block 5 and communicates with the inner cavity of the spring tube 4. The position of the through hole 51 corresponds to the air inlet 19. A slot 17 is machined on the inner side of the bottom of the U-shaped groove 16 and penetrates to the bottom of the watch case 1. The bottom of the U-shaped connecting block 5 extends downward to form an insert plate 52 (see Figure 7 , Figure 8 ), the inserting board 52 is inserted into the slot 17.

[0033] The pressure gauge structure is configured such that an integrated U-shaped connecting block is provided on the side of the upper support plate of the movement to position the spring tube. The closed end of the spring tube is hinged to the fan-shaped teeth through a connecting rod, and the open end of the spring tube is welded and fixed to the U-shaped connecting block. A through hole is provided in the middle of the U-shaped connecting block to communicate with the inner cavity of the spring tube. The spring tube and the movement form an integral structure. The position of the spring tube is unique and the positioning is more accurate. In addition, an integrated central positioning seat and side positioning seat are provided in the watch case to replace the joint and the movement connection. A positioning rod is provided on the central positioning seat to pass through the positioning hole of the lower support plate of the movement. The side positioning seat is provided with a connecting hole corresponding to the limiting hole of the upper support plate of the movement and fixed with screws. The U-shaped connecting block with the spring tube is inserted into the U-shaped groove on the side positioning seat. The spring tube can be connected to the air inlet. The structure is compact and the positioning is accurate. The number of connecting screws is effectively reduced, and the installation is more convenient.

[0034] In order to facilitate understanding of the present invention, the following description will be given in conjunction with the accompanying drawings.

[0035] The U-shaped connecting block is inserted into the U-shaped groove on the side positioning seat, and the plug plate at the bottom of the U-shaped connecting block is inserted into the slot inside the U-shaped groove, and the O-ring in the U-shaped groove abuts against the outer wall of the U-shaped connecting block, and the spring tube can be connected to the air inlet hole. After completing the positioning of the movement, the dial and pointer are installed above the movement, and the bottom surface of the dial is provided with a limiting rod that extends into the positioning sleeve to form an interference fit.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A compact pressure gauge, characterized in that: include: A watch case (1), wherein an integrated center positioning seat (11) is provided in the middle of the inner cavity of the watch case (1), a side positioning seat (14) is provided on one side of the center positioning seat (11) and extends to the inner side wall of the watch case (1), a positioning rod (13) is provided on the center positioning seat (11), a connecting hole (15) is machined on the upper part of the side positioning seat (14), a U-shaped groove (16) is machined on the side of the side positioning seat (14) adjacent to the center positioning seat (11), and an air inlet hole (19) is machined in the middle of the U-shaped groove (16); A movement (3), the movement (3) comprising an upper support plate (31) and a lower support plate (32), the lower support plate (32) being placed on the central positioning seat (11), the positioning rod (13) being fitted through a positioning hole (321) on the lower support plate (32), the bottom edge of the upper support plate (31) being abutted against a side positioning seat (14), and a limiting hole (311) being machined on the upper support plate (31) corresponding to the connecting hole (15); A spring tube (4), wherein the closed end of the spring tube (4) is connected to the connecting rod (38) on the movement (3), and the open end of the spring tube (4) is fixed to the U-shaped connecting block (5); The U-shaped connecting block (5) and the upper supporting plate (31) are integrally formed, and the U-shaped connecting block (5) is cooperatively placed in the U-shaped groove (16). A through hole (51) processed in the middle of the U-shaped connecting block (5) is connected to the inner cavity of the spring tube (4), and the position of the through hole (51) corresponds to the air inlet (19).

2. A compact pressure gauge according to claim 1, characterized in that: The lower support plate (32) is of a concave structure and its two side edges are riveted to the upper support plate (31) through positioning sleeves (36). A gear shaft (33) and a connecting shaft (37) are provided between the upper support plate (31) and the lower support plate (32). A hairspring is provided on the gear shaft (33). The connecting shaft (37) is provided with a sector tooth (35) meshing with the gear shaft (33). The other end of the sector tooth (35) is hinged to the connecting rod (38).

3. A compact pressure gauge according to claim 2, characterized in that: A dial (6) is provided above the movement (3); a pointer (7) is installed after the top end of the gear shaft (33) passes through a central hole (61) in the middle of the dial (6); a limiting rod (62) is provided on the bottom surface of the dial (6); and the limiting rod (62) cooperates and extends into the positioning sleeve (36).

4. A compact pressure gauge according to claim 2, characterized in that: The groove (12) machined in the middle of the center positioning seat (11) is used to avoid the bottom end of the gear shaft (33).

5. The compact pressure gauge according to claim 1, characterized in that: A slot (17) is machined on the inner side of the bottom of the U-shaped groove (16) and extends to the bottom of the watch case (1). The bottom of the U-shaped connecting block (5) extends downward to form an inserting plate (52), and the inserting plate (52) is inserted into the slot (17).

6. A compact pressure gauge according to claim 1, characterized in that: A sealing groove (18) is machined in the middle of the U-shaped groove (16) and outside the air inlet (19), and an O-ring (2) is built into the sealing groove (18).

7. A compact pressure gauge according to claim 6, characterized in that: The depth of the sealing groove (18) is smaller than the thickness of the O-ring (2), and the outer wall of the U-shaped connecting block (5) abuts against the O-ring (2).

8. The compact pressure gauge according to claim 1, characterized in that: The upper opening of the U-shaped groove (16) is chamfered.

9. The compact pressure gauge according to claim 1, characterized in that: The end of the positioning rod (13) is chamfered.

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