Precise pressure detection device

Abstract

The utility model discloses a precise pressure detection device, which comprises a shell, a reading plate arranged on the shell, a pointer used for indicating a pressure detection value of a measured medium on the reading plate, and a plurality of measuring mechanisms used for driving the pointer to move relative to the reading plate after the measured medium is introduced, each measuring mechanism is connected with a pointer, the reading plate is provided with slots for avoiding the pointers, the slots and the pointers are arranged in a one-to-one correspondence manner, and at least one side of each slot is marked with scales; according to the precise pressure detection device, the measuring mechanism respectively drives the corresponding pointers to simultaneously move in the corresponding open grooves and indicate the pressure detection values, the pointers are not shielded, the pressure detection values indicated by the pointers can be respectively and accurately read, the two pressure detection values can be visually compared, and the precision of the pressure detection device is improved. The pressure gauge is compact in structure, high in display precision and convenient for accurately reading a pressure detection value, so that reading errors are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure gauge technical field, in particular, relate to a precision pressure detection device. BACKGROUND

[0002] Pressure gauge is used for measuring and indicating the instrument higher than ambient pressure, is widely used in heat pipe network, oil and gas transmission, water supply and gas supply system and vehicle maintenance and so on field. Mechanical pressure gauge because because its sensitive element has very high mechanical strength, production is convenient, application is very universal.

[0003] The existing mechanical pressure gauge is generally single needle pressure gauge, and the dial plate cannot directly compare the size of two pressures, and the size of the reading of two pressure gauges needs to be measured and read respectively, and then compared, and the efficiency of this method is low. In order to compare the size of two pressures directly at the same time, the double needle pressure gauge emerges as the times require, and the existing double needle pressure gauge is a disc type dial head, two pointers are coaxially arranged above the circular dial plate, and the installation positions of the two pointers have height difference, when the values indicated by the two pointers are close, the upper pointer will shield the lower pointer, and when the pressure value is accurately read, error is easy to cause. SUMMARY

[0004] The utility model provides a precision pressure detection device to solve the technical problem that the existing double needle pressure in the value indicated by two pointers is close, and the upper pointer will shield the lower pointer, and when the pressure value is accurately read, error is easy to cause.

[0005] According to one aspect of the utility model, a precision pressure detection device is provided, which comprises a shell, a reading plate arranged on the shell, a pointer for indicating the pressure detection value of the measured medium on the reading plate, and a measuring mechanism for driving the pointer to move relative to the reading plate after the measured medium is introduced. A plurality of measuring mechanisms are arranged in the shell, each measuring mechanism is connected to a pointer, a slot for avoiding the pointer is formed on the reading plate, the slot and the pointer are one-to-one arranged, and at least one side of each slot is marked with a scale.

[0006] Further, the measuring mechanism comprises an axial expansion member which axially deforms after the measured medium is introduced, and a connecting rod mechanism for amplifying the displacement of the axial expansion member and driving the pointer to move, a through hole for introducing the measured medium into the axial expansion member is formed on the shell, the first end of the axial expansion member is connected to the shell, and the second end can expand along the axial direction of itself after the measured medium is introduced.

[0007] Further, the axial telescopic member comprises a sleeve, a capsule arranged in the sleeve, and a cover plate in sliding connection with the sleeve, the first end of the sleeve is connected with the shell, the through hole is in communication with the capsule, the capsule pushes the cover plate to move in the axial direction of the sleeve after the measured medium is introduced, and the connecting rod mechanism is connected with the cover plate.

[0008] Further, the axial telescopic member comprises a cylinder, a piston in sliding and sealing connection with the cylinder, and a piston rod arranged on the piston, the through hole is in communication with the cylinder, the cylinder pushes the piston to move in the axial direction of the cylinder after the measured medium is introduced, and the connecting rod mechanism is connected with the piston rod.

[0009] Further, the connecting rod mechanism comprises a rotary shaft, a connecting rod, a curved arm, a pull rod, an elastic element, and a sliding seat, the rotary shaft is rotationally arranged on the shell, the first end of the connecting rod is connected with the second end of the axial telescopic member, the second end of the connecting rod is hingedly connected with the first end of the curved arm, the second end of the curved arm, the first end of the pull rod, and the first end of the elastic element are fixedly connected with the rotary shaft, the second end of the elastic element is fixedly connected with the shell or the reading plate, the sliding seat is arranged on the shell, the second end of the pull rod is connected with the middle part of the pointer, the sliding seat is connected with the first end of the pointer, and the second end of the pointer indicates a pressure detection value on the reading plate.

[0010] Further, the second end of the pull rod is hingedly connected with the middle part of the pointer, the sliding seat is slidingly hingedly connected with the first end of the pointer, and the second end of the pointer indicates a pressure detection value on the reading plate.

[0011] Further, the sliding seat is hingedly connected with the first end of the pointer, the second end of the pull rod is slidingly hingedly connected with the middle part of the pointer, and the second end of the pointer indicates a pressure detection value on the reading plate.

[0012] Further, a first rotating shaft is arranged on the free end of the axial telescopic member, a first rotating disc and a nut for locking the first rotating disc are arranged on the first rotating shaft, a first pin shaft is arranged eccentrically on the first rotating disc, and the first pin shaft is hingedly connected with the first end of the connecting rod.

[0013] Further, a second rotating disc and a nut for locking the second rotating disc are arranged on the rotary shaft, a second pin shaft is arranged eccentrically on the second rotating disc, and the second pin shaft is hingedly connected with the second end of the connecting rod.

[0014] Further, the elastic element is a Bourdon tube, a coil spring, a torsion spring, or a hairspring.

[0015] The utility model has the following beneficial effects:

[0016] The utility model discloses a precision pressure detection device, and each measuring mechanism is connected with a pointer respectively, and the reading board is provided with a slot corresponding to the pointer, and each slot is marked with a scale, when the measuring mechanism respectively passes into the medium to be measured, the measuring mechanism respectively drives the corresponding pointer to move in the corresponding slot and indicates the pressure detection value, the pointers do not block each other, can accurately read the pressure detection value indicated by each pointer, and can compare the two pressure detection values intuitively, the compact structure is high in display precision, and the pressure detection value can be read accurately, thereby reducing the reading error.

[0017] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. The utility model will be further explained in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings that form a part of this application are intended to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the explanation thereof are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0019] Figure 1 It is the structure schematic diagram of precision pressure detection device of preferred embodiment of the utility model;

[0020] Figure 2 It is the structure schematic diagram of connecting rod mechanism of preferred embodiment of the utility model;

[0021] Figure 3 It is the structure schematic diagram of first turntable of preferred embodiment of the utility model.

[0022] LEGEND:

[0023] 1, shell; 11, through hole; 2, reading board; 21, slot; 3, pointer; 4, measuring mechanism; 41, axial telescopic part; 411, sleeve; 412, cover plate; 413, first rotating shaft; 414, first turntable; 415, first pin shaft; 42, connecting rod mechanism; 421, rotating shaft; 422, connecting rod; 423, curved arm; 424, pull rod; 425, elastic element; 426, sliding seat; 427, second turntable; 428, second pin shaft. DETAILED DESCRIPTION

[0024] The embodiments of the utility model will be explained in detail below in combination with the drawings, but the utility model can be implemented in multiple different modes limited and covered by the following.

[0025] As Figure 1As shown, the precise pressure detection device of the embodiment comprises a shell 1, a reading plate 2 arranged on the shell 1, a pointer 3 for indicating the pressure detection value of the measured medium on the reading plate 2, and a measuring mechanism 4 for driving the pointer 3 to move relative to the reading plate 2 after the measured medium is introduced. A plurality of measuring mechanisms 4 are arranged in the shell 1, and each measuring mechanism 4 is connected with a pointer 3. A slot 21 for avoiding the pointer 3 is arranged on the reading plate 2, and the slot 21 is arranged in one-to-one correspondence with the pointer 3. At least one side of each slot 21 is marked with a scale.

[0026] The precise pressure detection device of the embodiment, the two measuring mechanisms 4 are symmetrically arranged in the shell 1, and the two measuring mechanisms 4 are respectively connected with the two pointers 3. Two slots 21 are arranged on the reading plate 2, and one side of each slot 21 is marked with a scale. When the two measuring mechanisms 4 are respectively introduced into the measured medium, the two measuring mechanisms 4 respectively drive the two pointers 3 to simultaneously move in the corresponding slots 21 and indicate the corresponding pressure detection values. The two pointers 3 do not block each other, and the pressure detection values indicated by the two pointers 3 can be accurately read. The two pressure detection values can also be directly compared. The structure is compact, the display precision is high, and the pressure detection value can be accurately read, thereby reducing the reading error. It can be understood that the measuring mechanism 4 can also be three, four or more, and the size of the shell 1 can be correspondingly increased and the number of pointers 3 and slots 21 can be increased. Alternatively, the shell 1 is a cuboid, the reading plate 2 is a rectangular dial, and the slot 21 is a straight slot, which is more intuitive. Alternatively, the measured medium is gas or liquid. Alternatively, the scale is arranged between the two slots 21, so that the two pointers 3 can simultaneously indicate the pressure detection value on one scale, which is more convenient for reading and comparing values. Alternatively, the two sides of each slot 21 are marked with scales, so that the staff can read the pressure detection value from multiple angles.

[0027] As shown in Figure 2 and Figure 3 In the embodiment, the measuring mechanism 4 comprises an axial expansion member 41 which axially deforms after the measured medium is introduced, and a connecting rod mechanism 42 for amplifying the displacement of the axial expansion member 41 and driving the pointer 3 to move. A through hole 11 is arranged on the shell 1 for introducing the measured medium into the axial expansion member 41. The first end of the axial expansion member 41 is connected with the shell 1, and the second end can axially expand along the axial direction of the axial expansion member 41 after the measured medium is introduced. The displacement of the axial expansion member 41 can be amplified through the connecting rod mechanism 42, and the pointer 3 can be driven to move in the slot 21. Compared with the gear structure transmission in the prior art, the connecting rod mechanism 42 of the embodiment can avoid the error caused by gear wear, has a long service life, and has high measurement accuracy.

[0028] In the embodiment, the axial telescopic member 41 comprises a sleeve 411, a capsule arranged in the sleeve 411, and a cover plate 412 in sliding connection with the sleeve 411. The first end of the sleeve 411 is connected with the shell 1, and the sleeve 411 can limit the telescopic direction of the capsule. The through hole 11 is in communication with the capsule. After the measured medium is introduced into the capsule, the capsule pushes the cover plate 412 to move along the axial direction of the sleeve 411. The connecting rod mechanism 42 is connected with the cover plate 412. When the pressure of the measured medium in the capsule decreases, the capsule automatically contracts, and the cover plate 412 moves to the initial position under the action of its own gravity and the connecting rod mechanism 42. The axial telescopic member 41 has simple structure, low manufacturing cost, and convenient maintenance. Alternatively, the capsule is connected with the cover plate 412, and when the capsule contracts, the cover plate 412 can be reset.

[0029] In the embodiment, the axial telescopic member 41 comprises a cylinder, a piston in sliding and sealing connection with the cylinder, and a piston rod arranged on the piston. The through hole 11 is in communication with the cylinder. After the measured medium is introduced into the cylinder, the cylinder pushes the piston to move along the axial direction of the cylinder. The connecting rod mechanism 42 is connected with the piston rod. The axial telescopic member 41 can provide a higher pressure measurement range, has good stability, and has high precision.

[0030] In the embodiment, the axial telescopic member 41 comprises a bellows, a guide column, a first sealing plate, and a second sealing plate. The first sealing plate and the second sealing plate are respectively in sealing connection with two ends of the bellows. The first sealing plate is connected with the shell 1. The guide column is installed on the first sealing plate and is arranged in parallel with the axis of the bellows. The second sealing plate is provided with an opening hole matched with the guide column, so that the guide column is in sliding connection with the second sealing plate. The connecting rod mechanism 42 is connected with the second sealing plate. The through hole 11 is in communication with the first sealing plate. After the measured medium is introduced into the bellows, the bellows pushes the second sealing plate to move along the axial direction of the bellows.

[0031] As Figure 1 and Figure 2As shown, in the embodiment, the connecting rod mechanism 42 comprises a rotating shaft 421, a connecting rod 422, a curved arm 423, a pull rod 424, an elastic element 425 and a sliding seat 426. The rotating shaft 421 is rotationally arranged on the shell 1. The first end of the connecting rod 422 is connected with the second end of the axial telescopic member 41. The second end of the connecting rod 422 is hingedly connected with the first end of the curved arm 423. The second end of the curved arm 423, the first end of the pull rod 424 and the first end of the elastic element 425 are fixedly connected with the rotating shaft 421. The second end of the elastic element 425 is fixedly connected with the shell 1 or the reading plate 2. The sliding seat 426 is arranged on the shell 1. The second end of the pull rod 424 is connected with the middle part of the pointer 3. The sliding seat 426 is connected with the first end of the pointer 3. The second end of the pointer 3 indicates the pressure detection value on the reading plate 2. Under the action of the measured medium, the axial telescopic member 41 is stretched in length to produce axial displacement, so that the connecting rod 422 and the curved arm 423 drive the rotating shaft 421 to rotate. The rotation of the rotating shaft 421 causes the elastic element 425 to be elastically deformed, and at the same time drives the pull rod 424 to produce displacement. The pull rod 424 drives the second end of the pointer 3 to move in the slot 21 on the reading plate 2, so as to display the detection pressure value. When the pressure of the measured medium inside the axial telescopic member 41 decreases, the force transmitted to the connecting rod mechanism 42 decreases. The elastic element 425 provides a rebound force greater than the force of the connecting rod 422, so that the connecting rod mechanism 42 moves to the initial position. When the pressure of the measured medium decreases to zero, the connecting rod mechanism 42 returns to the initial state under the elastic force of the elastic element 425. The structure is simple, the connection is reliable, the displacement of the axial telescopic member 41 can be amplified, and the measured pressure value can be accurately displayed on the reading plate 2 through the pointer 3.

[0032] As shown, in the embodiment, the second end of the pull rod 424 is hingedly connected with the middle part of the pointer 3. The sliding seat 426 is slidingly hingedly connected with the first end of the pointer 3. The sliding seat 426 is arranged with a sliding groove. The sliding groove is arranged with a sliding block. The first end of the pointer 3 is hingedly connected with the sliding block. The second end of the pointer 3 indicates the pressure detection value on the reading plate 2. The rotating shaft 421 is arranged on the extension line of the sliding groove. Figure 1 The first end of the pointer 3 can slide back and forth in the sliding groove under the traction of the pull rod 424. The second end moves back and forth in the slot 21 on the reading plate 2, so as to display the detection pressure value. The pointer 3 is driven by the pull rod 424. Compared with the gear transmission, the structure is simple, and the precision difference caused by gear wear can be avoided.

[0033] In this embodiment, the slide 426 is hinged to the first end of the pointer 3, the second end of the pull rod 424 is slidingly hinged to the middle part of the pointer 3, the second end of the pointer 3 indicates the pressure detection value on the reading plate 2, a slide groove is provided on the middle part of the pointer 3, a slider is provided in the slide groove, the second end of the pull rod 424 is hinged to the slider, the first end of the pointer 3 is hinged to the slide 426, and the second end of the pointer 3 indicates the pressure detection value on the reading plate 2; the second end of the pull rod 424 can slide back and forth relative to the pointer 3, and drive the second end of the pointer 3 to move back and forth in the slot 21 on the reading plate 2, thereby displaying the detection pressure value.

[0034] like Figure 1 As shown, in this embodiment, the axial telescopic member 41 includes a sleeve 411, a capsule arranged in the sleeve 411 and a cover plate 412 slidingly connected to the sleeve 411, a first rotating shaft 413 is arranged on the cover plate 412, a first rotating disk 414 and a nut for locking the first rotating disk 414 are arranged on the first rotating shaft 413, a first pin 415 is eccentrically arranged on the first rotating disk 414, the first pin 415 is hinged to the first end of the connecting rod 422, and the second end of the connecting rod 422 is hinged to the crank arm 423, the first rotating disk 414 can be rotated by loosening the nut, and is fixed by the nut, so that the first pin 415 rotates around the first rotating shaft 413, thereby changing the slope and equivalent length of the connecting rod 422, and realizing the initial position adjustment of the pointer 3. After the adjustment is completed, the nut is tightened to position the first rotating disk 414. Optionally, the axial telescopic member 41 includes a cylinder body, a piston slidingly and sealingly connected to the cylinder body, and a piston rod arranged on the piston, a first rotating shaft 413 is arranged on the piston rod, a first rotating shaft 413 is arranged on the first rotating shaft 414 and a nut for locking the first rotating shaft 414, a first pin shaft 415 is eccentrically arranged on the first rotating shaft 414, and the first pin shaft 415 is hinged to the first end of the connecting rod 422.

[0035] In this embodiment, a second rotary disk 427 and a nut for locking the second rotary disk 427 are rotatably arranged on the rotary shaft 421. A second pin 428 is eccentrically arranged on the second rotary disk 427. The second pin 428 is hinged to the second end of the connecting rod 422. The second rotary disk 427 can be rotated by loosening the nut, so that the second pin 428 rotates around the rotary shaft 421, thereby changing the slope and equivalent length of the connecting rod 422 to achieve the initial position adjustment of the pointer 3. After the adjustment is completed, the nut is tightened to position the second rotary disk 427. Optionally, as Figure 3As shown, the rotary shaft 421 is fixedly arranged with an adapter rod, the adapter rod is rotatably arranged with a second turntable 427, the second turntable 427 is eccentrically arranged with a second pin shaft 428 and a nut for locking the second turntable 427, the second pin shaft 428 is hingedly connected with the second end of the connecting rod 422, the second turntable 427 can be rotated by loosening the nut, so as to change the slope and equivalent length of the connecting rod 422, realize the initial position adjustment of the pointer 3, and the nut is tightened to position the second turntable 427 after the adjustment is completed.

[0036] In the embodiment, the elastic element 425 is a Bourdon tube, a coil spring, a torsion spring or a hairspring.

[0037] The preferred embodiments of the present application are described above, but the present application is not limited to the above. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A precision pressure detection device, characterized in that: The invention comprises a shell (1), a reading plate (2) arranged on the shell (1), a pointer (3) for indicating the pressure detection value of the measured medium on the reading plate (2), and a measuring mechanism (4) for driving the pointer (3) to move relative to the reading plate (2) after the measured medium is introduced, wherein a plurality of the measuring mechanisms (4) are arranged in the shell (1), each of the measuring mechanisms (4) is connected to one of the pointers (3), and a slot (21) for avoiding the pointer (3) is provided on the reading plate (2), the slot (21) and the pointer (3) are arranged one-to-one, and at least one side of each of the slots (21) is marked with a scale.

2. The precision pressure detection device according to claim 1, characterized in that: The measuring mechanism (4) comprises an axially extending member (41) that undergoes axial deformation after the medium to be measured is introduced, and a connecting rod mechanism (42) for amplifying the displacement of the axially extending member (41) and driving the pointer (3) to move. The housing (1) is provided with a through hole (11) for introducing the medium to be measured into the axially extending member (41). The first end of the axially extending member (41) is connected to the housing (1), and the second end can be extended and retracted along its own axial direction after the medium to be measured is introduced.

3. The precision pressure detection device according to claim 2, characterized in that: The axial telescopic member (41) comprises a sleeve (411), a capsule disposed in the sleeve (411), and a cover plate (412) slidably connected to the sleeve (411); a first end of the sleeve (411) is connected to the housing (1); the through hole (11) is communicated with the capsule; after the measured medium is introduced into the capsule, the capsule pushes the cover plate (412) to move along the axial direction of the sleeve (411); and the connecting rod mechanism (42) is connected to the cover plate (412).

4. The precision pressure detection device according to claim 2, characterized in that: The axial telescopic member (41) includes a cylinder body, a piston connected to the cylinder body in a sliding and sealing manner, and a piston rod arranged on the piston. The through hole (11) is connected to the cylinder body. After the measured medium is introduced into the cylinder body, the cylinder body pushes the piston to move along the axial direction of the cylinder body. The connecting rod mechanism (42) is connected to the piston rod.

5. The precision pressure detection device according to claim 3 or 4, characterized in that: The connecting rod mechanism (42) includes a rotating shaft (421), a connecting rod (422), a crank arm (423), a pull rod (424), an elastic element (425) and a sliding seat (426). The rotating shaft (421) is rotatably arranged on the housing (1). The first end of the connecting rod (422) is connected to the second end of the axial telescopic member (41). The second end of the connecting rod (422) is hinged to the first end of the crank arm (423). The second end of the crank arm (423) and the pull rod (424) are hinged to each other. The first end and the first end of the elastic element (425) are fixedly connected to the rotating shaft (421), the second end of the elastic element (425) is fixedly connected to the housing (1) or the reading plate (2), the slide (426) is arranged on the housing (1), the second end of the pull rod (424) is connected to the middle of the pointer (3), the slide (426) is connected to the first end of the pointer (3), and the second end of the pointer (3) indicates the pressure detection value on the reading plate (2).

6. The precision pressure detection device according to claim 5, characterized in that: The second end of the pull rod (424) is hinged to the middle of the pointer (3), and the sliding seat (426) is slidingly hinged to the first end of the pointer (3).

7. The precision pressure detection device according to claim 5, characterized in that: The sliding seat (426) is hinged to the first end of the pointer (3), and the second end of the pull rod (424) is slidingly hinged to the middle of the pointer (3).

8. The precision pressure detection device according to claim 5, characterized in that: A first rotating shaft (413) is provided on the free end of the axial telescopic member (41), a first rotating disc (414) and a nut for locking the first rotating disc (414) are provided on the first rotating shaft (413), a first pin (415) is eccentrically provided on the first rotating disc (414), and the first pin (415) is hinged to the first end of the connecting rod (422).

9. The precision pressure detection device according to claim 5, characterized in that: A second rotating disk (427) and a nut for locking the second rotating disk (427) are arranged on the rotating shaft (421); a second pin (428) is eccentrically arranged on the second rotating disk (427); and the second pin (428) is hinged to the second end of the connecting rod (422).

10. The precision pressure detection device according to claim 5, characterized in that: The elastic element (425) is a Bourdon tube, a coil spring, a torsion spring or a hairspring.

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