Gas piston type pressure vacuum gauge

Abstract

The invention relates to a gas piston type pressure vacuum gauge, and belongs to the field of pressure metering, the gas piston type pressure vacuum gauge comprises a support frame, a piston sleeve and a piston system, the upper end of the support frame is provided with a positioning hole vertically penetrating through the support frame, the piston system comprises a piston cylinder with two open ends and a piston arranged in the piston cylinder, and one end of the piston is coaxially connected with a piston connecting rod; the piston sleeve is filled with the piston cylinder, one end of the piston cylinder is in sealing contact with a sealing piece arranged on the inner wall of one end of the piston sleeve, an air pipe connector is arranged in the middle of one end of the piston sleeve, the sealing piece is provided with a hole channel communicated with the air pipe connector and an inner cavity of the piston cylinder, the piston sleeve is vertically arranged in the positioning hole, and the air pipe connector is connected with negative-pressure or positive-pressure equipment through a pipeline. And a counterweight loading piece is detachably arranged on the piston connecting rod. The device has the advantages that the condition that the whole piston is in a horizontal state during measurement can be provided, it is ensured that the piston can be kept in a vertical state during use so as to achieve the purpose of reducing measurement errors, and the overall structural design is more stable and reasonable.

Description

Technical Field

[0001] The present invention belongs to the field of pressure measurement, and particularly relates to a gas piston pressure vacuum gauge. Background Art

[0002] A piston pressure gauge is an instrument for measuring pressure based on the principle that the gravity loaded on the effective area of the piston by the piston, its connecting parts and special weights is balanced with the force generated by the measured pressure acting on the lower end face of the piston. A piston pressure vacuum gauge is a piston pressure gauge used to measure positive or negative pressure, and is generally used as a pressure measurement standard device to carry out value transfer to other pressure measurement instruments. Piston pressure vacuum gauges can be divided into single-piston pressure vacuum gauges, double-piston pressure vacuum gauges, liquid-column balanced piston pressure vacuum gauges, and gas piston pressure vacuum gauges.

[0003] Currently, the structure of existing piston pressure vacuum gauges (specifically referring to single-piston pressure vacuum gauges and gas piston pressure vacuum gauges) is as follows: both sides of the piston outer cylinder for installing the piston and the piston cylinder are connected to the pressure gauge bracket through a horizontal axis with a fastening handle. The outer cylinder can rotate around the horizontal axis. When measuring positive pressure, it is flipped so that the piston connecting rod is vertically upward, and the fastening handle is locked. When measuring negative pressure, the fastening handle is loosened, the outer cylinder is rotated so that the piston connecting rod is vertically downward, and then the fastening handle is locked. However, when using the existing piston pressure vacuum gauge, it is necessary to ensure that the piston connecting rod is perpendicular to the horizontal plane to ensure the accuracy of the pressure value. The piston positioning adopts a horizontal axis rotation mode, and the angle and level need to be manually adjusted. The operations of different operators will introduce uncertainties in the horizontal adjustment, thus causing errors. Especially after loading the weights, in the working state, the locking force of the fastening handle will also affect the original vertical state of the piston, resulting in deviations, which are difficult for the operator to detect, thus affecting the measurement results. In addition, the existing solution does not have a position for placing a level, and it is difficult to achieve both initial adjustment and in-use monitoring.

[0004] Based on this, it is necessary to develop a gas piston pressure vacuum gauge to overcome the above technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a gas piston pressure vacuum gauge, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the present invention for solving the above technical problems is as follows:

[0007] A gas piston type pressure vacuum gauge, comprising a support frame, a piston sleeve and a piston system. A positioning hole vertically penetrating the upper end of the support frame is provided. The piston system includes a piston cylinder with both ends open and a piston installed in the piston cylinder. One end of the piston is coaxially connected with a piston connecting rod. The piston cylinder is loaded in the piston sleeve, and one end thereof is in sealed contact with a seal arranged on the inner wall of one end of the piston sleeve. A tracheal interface is provided in the middle of one end of the piston sleeve. The seal is provided with a pore communicating the tracheal interface with the inner cavity of the piston cylinder. The piston sleeve is vertically installed in the positioning hole. The tracheal interface is connected to a negative pressure or positive pressure device through a pipeline. A weight loading member is detachably installed on the piston connecting rod.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Further, the other end of the piston sleeve is open and is detachably provided with a locking member for tightly fitting with the other end of the piston cylinder.

[0010] Further, the locking member includes a cylindrical limiting sleeve and a limiting disc. One end of the limiting sleeve is open, and an opening is provided in the middle of the other end. Internal threads are provided on the inner wall of one end of the limiting sleeve. External threads are provided on the outer surface of the other end of the piston sleeve. The limiting sleeve is screwed onto the other end of the piston sleeve. The limiting disc is provided with a notch with a uniform width from the center to its edge. The width of the notch is greater than the diameter of the piston connecting rod and less than the diameter of the piston. The limiting disc is clamped between the other end of the limiting sleeve and the other end of the piston cylinder.

[0011] Further, the weight loading member is a disc-shaped weight. A through hole for the piston connecting rod to pass through is provided in the center of the weight. A slit with a width greater than the diameter of the piston connecting rod is provided from the central through hole to the edge of the weight. Limiting discs are coaxially provided at both ends of the piston connecting rod. The weight is sleeved on the piston connecting rod. The opening at the other end of the limiting sleeve is circular and its diameter is greater than the diameter of the limiting disc.

[0012] Further, the support frame includes a bottom plate, a top plate and multiple support columns. The bottom plate is horizontally arranged. The top plate is parallelly arranged above the bottom plate. The multiple support columns are respectively vertically fixed between the bottom plate and the top plate, and the multiple support columns are distributed around the edges of the bottom plate and the top plate. The positioning hole is provided in the middle of the top plate.

[0013] Further, both the bottom plate and the top plate are triangular plate bodies, and fillets are provided at the outer edges of the end corners. Correspondingly, there are three support columns, which are respectively distributed at the three end corners of the bottom plate and the top plate.

[0014] Further, a spirit level is provided on the upper part of the top plate.

[0015] Further, a plurality of height-adjustable support feet are provided at intervals at the bottom of the above-mentioned support frame.

[0016] Further, the above-mentioned positioning hole is an internal thread hole, an external thread is provided in the middle of the outer circumference of the above-mentioned piston sleeve, and the above-mentioned piston sleeve is screwed into the above-mentioned internal thread hole.

[0017] Further, a screw hole is provided in the middle of one end of the above-mentioned piston, a thread is provided at one end of the above-mentioned piston connecting rod, and it is screwed into the screw hole at one end of the above-mentioned piston. The other end of the above-mentioned piston connecting rod is detachably provided with an operation disc.

[0018] The beneficial effects of the present invention are: it can provide the condition that the piston is in a horizontal state as a whole during measurement, and ensure that the piston can maintain a vertical state during use, so as to achieve the purpose of reducing measurement errors, and the overall structural design is more stable and reasonable. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the gas piston type pressure vacuum gauge of the present invention in a positive pressure state;

[0020] Figure 2 It is a schematic structural diagram of the gas piston type pressure vacuum gauge of the present invention in a negative pressure state;

[0021] Figure 3 It is a schematic structural diagram of the support frame in the gas piston type pressure vacuum gauge of the present invention;

[0022] Figure 4 It is a schematic structural diagram of the piston system in the gas piston type pressure vacuum gauge of the present invention;

[0023] Figure 5 It is a schematic structural diagram of the limit disc in the gas piston type pressure vacuum gauge of the present invention.

[0024] In the drawings, the list of components represented by each reference numeral is as follows:

[0025] 1. Support frame; 2. Piston sleeve; 3. Piston system; 4. Weight loading member; 5. Locking member; 6. Level gauge; 7. Support foot; 11. Bottom plate; 12. Top plate; 13. Support column; 21. Air pipe interface; 22. Sealing member; 31. Piston cylinder; 32. Piston; 33. Piston connecting rod; 51. Limit sleeve; 52. Limit disc; 331. Limit disc; 332. Operation disc; 521. Notch. Detailed Embodiments

[0026] The principles and features of the present invention will be described below with reference to the drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0027] Embodiment

[0028] As shown Figure 1 , 2 , as shown in Fig. 4, the gas piston type pressure vacuum gauge of this embodiment includes a support frame 1, a piston sleeve 2 and a piston system 3. A positioning hole (designated as A in the figure) vertically penetrating the upper end of the support frame 1 is provided. The piston system 3 includes a piston cylinder 31 with both ends open and a piston 32 installed in the piston cylinder 31. One end of the piston 32 is coaxially connected with a piston connecting rod 33. The piston cylinder 31 is filled in the piston sleeve 2, and one end thereof is in sealed contact with a seal 22 provided on the inner wall of one end of the piston sleeve 2. A tracheal interface 21 is provided in the middle of one end of the piston sleeve 2. The seal 22 is provided with a hole (designated as b in the figure) communicating the tracheal interface 21 with the inner cavity of the piston cylinder 31. The piston sleeve 2 is vertically installed in the positioning hole. The tracheal interface 21 is connected to a negative pressure or positive pressure device through a pipeline. A weight loading member 4 is detachably installed on the piston connecting rod 33.

[0029] During the use of the gas piston type pressure vacuum gauge of this embodiment, there are the following two usage states:

[0030] 1) Measure the performance of the piston system 3 under positive pressure conditions (that is, the piston cylinder 31 is connected to positive pressure). When the piston sleeve 2 is assembled at the positioning hole, the other end faces upward and the end with the tracheal interface 21 faces downward. The tracheal interface 21 is connected to a positive pressure device through a pipeline. After assembling the entire device according to the structure, a weight loading member 4 is loaded at the piston connecting rod 33. At the same time, a gas medium is injected into the lower cavity of the piston cylinder 31 in the current state through the positive pressure device. The weight loading member 4 serves as a gravity load, and by adjusting the weight loading member 4 and the pressure of the injected gas medium, the two reach equilibrium.

[0031] 2) Measure the performance of the piston system 3 under negative pressure conditions (that is, the piston cylinder 31 is connected to negative pressure). When the piston sleeve 2 is assembled at the positioning hole, the end with the tracheal interface 21 faces upward and the other end faces downward, that is, the piston connecting rod 33 is located in the support frame 1. By loading a weight loading member 4 on the piston connecting rod 33, at the same time, a negative pressure is generated in the upper cavity of the piston cylinder 31 in the current state through a negative pressure device. By adjusting the weight loading member 4 and the magnitude of the negative pressure, the pressure received by the piston 32 and the gravity load reach equilibrium.

[0032] In the gas piston type pressure vacuum gauge of this embodiment, first, adjust the horizontal state of the support frame 1 so that the positioning holes are in a horizontal state. Since the positioning holes are vertically arranged holes, after the piston sleeve 2 is inserted into the positioning holes, the piston sleeve 2 always remains in a vertical state, that is, the piston 32 in the piston system 3 is always in a vertical state. During the subsequent loading of the weight loading member 4, the piston 32 will not change its vertical (perpendicular) state, which will not affect the measurement result, greatly reducing the measurement error, and the overall structural design is more stable and reasonable.

[0033] It should be particularly emphasized that: the most important thing in this embodiment lies in the horizontal maintenance of the support frame 1, that is, the horizontal state of the support frame 1, which is related to the positioning holes at the upper end of the support frame 1. It is necessary to ensure that the positioning holes are in a vertical state, so that the piston sleeve 2 can remain vertical after being inserted into the positioning holes (the internal piston system also remains in a vertical state), and then an effective and orderly measurement can be carried out. Moreover, the measurement in the vertical state can achieve the purpose of greatly reducing the measurement error.

[0034] As a preferred implementation manner, the other end of the above piston sleeve 2 is provided with an open end, and a locking member 5 for tightly fitting with the other end of the piston cylinder 31 is detachably installed.

[0035] In the above implementation scheme, the open end of the other end of the piston sleeve 2 facilitates the installation of the piston system 3. At the same time, through the cooperation of the locking member 5 and the piston cylinder 31, it is avoided that the piston system 3 disengages from the piston sleeve 2 during measurement under positive or negative pressure conditions. At the same time, a relatively tight sealing connection between the piston cylinder 31 and the sealing member 22 is maintained, creating better measurement conditions.

[0036] As a preferred implementation manner, as Figure 1 、 2 、5 shows, the above locking member 5 includes a cylindrical limiting sleeve 51 and a limiting circular plate 52. One end of the limiting sleeve 51 is open, and an opening is provided in the middle of the other end. Internal threads are provided on the inner wall of one end of the limiting sleeve 51, and external threads are provided on the outer surface of the other end of the piston sleeve 2. The limiting sleeve 51 is screwed onto the other end of the piston sleeve 2. The limiting circular plate 52 is provided with a notch 521 with a uniform width from the center to its edge. The width of the notch 521 is greater than the diameter of the piston connecting rod 33 and less than the diameter of the piston 32. The limiting circular plate 52 is clamped between the other end of the limiting sleeve 51 and the other end of the piston cylinder 31.

[0037] In the above-mentioned implementation scheme, during assembly, the limiting sleeve 51 is first removed, and the piston system 3 is installed in the piston sleeve 2. At this time, the piston cylinder 31 is completely installed in the piston sleeve 2, and one end is in sealing contact with the seal 22. Then, the limiting disc 52 is moved laterally and inserted into the piston connecting rod 33. Next, the limiting sleeve 51 is installed. By tightening the limiting sleeve 51, the two ends of the piston cylinder 31 can be clamped between the seal 22 and the limiting disc 52 (the limiting disc 52 is also clamped between the piston cylinder 31 and the limiting sleeve 51). Since the width of the notch 521 of the limiting disc 52 is smaller than the diameter of the piston 32, the piston 32 is restricted by the limiting disc 52 during the axial movement in the piston cylinder 31 and will not separate from the piston cylinder 31.

[0038] As a preferred embodiment, the counterweight loader 4 is a disc-shaped weight, a through hole is provided in the center of the weight for the piston connecting rod 33 to pass through, a gap with a width greater than the diameter of the piston connecting rod 33 is opened from the center through hole to the edge of the weight, and limiting discs 331 are coaxially provided at both ends of the piston connecting rod 33, the weight is sleeved on the piston connecting rod 33, and the opening at the other end of the limiting sleeve 51 is circular, and its diameter is greater than the diameter of the limiting disc 331.

[0039] In the above embodiment, the counterweight loading member 4 adopts the weight member of the above shape. When the piston connecting rod 33 is facing upward, the weight is inserted into the piston connecting rod 33 and is "hung" on a limiting disk 331 close to the piston 32. When the piston connecting rod 33 is facing downward, the weight is "hung" on a limiting disk 331 away from the piston 32.

[0040] As a preferred embodiment, Figure 3 As shown, the support frame 1 includes a bottom plate 11, a top plate 12 and a plurality of support columns 13. The bottom plate 11 is horizontally arranged, the top plate 12 is parallelly arranged above the bottom plate 11, the plurality of support columns 13 are respectively vertically fixed between the bottom plate 11 and the top plate 12, and the plurality of support columns 13 are distributed around the edges of the bottom plate 11 and the top plate 12, and the positioning hole is provided in the middle of the top plate 12.

[0041] In the above embodiment, the support frame 1 has a simple structural design. When measuring negative pressure, the piston 32 and the weight are located between the two plates, and the plurality of support columns 13 surround the piston 32 and the weight, thereby enhancing related protection.

[0042] As a preferred embodiment, the bottom plate 11 and the top plate 12 are both triangular plates with rounded corners. Three corresponding support columns 13 are provided and are distributed one by one at the three corners of the bottom plate 11 and the top plate 12.

[0043] In the above-described embodiments, the bottom plate 11 and the top plate 12 are both isosceles obtuse triangles with the same shape and size. The corners are designed with arcs and polished to reduce scratching and displacement of the piston system 3 caused by external factors during use. The obtuse angle design increases the length of the bottom side, making the operable space on the front of the pressure gauge larger and facilitating the loading and unloading of weights.

[0044] In this embodiment, a spirit level 6 is provided above the top plate 12. The spirit level 6 can provide a reference for whether the positioning hole is horizontal, facilitating timely adjustment by the staff.

[0045] In this embodiment, a plurality of height-adjustable support feet 7 are provided at intervals at the bottom of the support frame 1. The support frame 1 can be adjusted in height in multiple directions through the support feet 7, thereby adjusting the horizontal state of the support frame 1, that is, adjusting the positioning hole to be in a horizontal state.

[0046] As a preferred embodiment, the positioning hole is an internal threaded hole, an external thread is provided in the middle of the outer circumference of the piston sleeve 2, and the piston sleeve 2 is screwed into the internal threaded hole.

[0047] In the above-described embodiments, the piston sleeve 2 and the positioning hole are assembled by threads, the structure is more stable, and it can ensure that the piston sleeve 2 and the internal piston system 3 are in the same vertical state as the positioning hole.

[0048] As a preferred embodiment, a screw hole is provided in the middle of one end of the piston 32, a thread is provided at one end of the piston connecting rod 33, and the piston connecting rod 33 is screwed into the screw hole at one end of the piston 32. An operation disc 332 is detachably installed at the other end of the piston connecting rod 33.

[0049] In the above-described embodiments, the design of the operation disc 332 facilitates the taking of the piston system 3. The piston connecting rod 33 is assembled with one end of the piston 32 by threads, and the two are convenient for disassembly and assembly.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" and the like shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0054] In the description of this specification, descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A gas piston pressure vacuum gauge, characterized in that: The invention comprises a support frame (1), a piston sleeve (2) and a piston system (3). The upper end of the support frame (1) is provided with a positioning hole which passes through the support frame vertically. The piston system (3) comprises a piston cylinder (31) which is open at both ends and a piston (32) which is installed in the piston cylinder (31). One end of the piston (32) is coaxially connected with a piston connecting rod (33). The piston cylinder (31) is loaded in the piston sleeve (2), and one end of the piston cylinder (31) is in sealing contact with a sealing member (22) which is arranged on the inner wall of one end of the piston sleeve (2). An air pipe interface (21) is arranged in the middle of one end of the piston sleeve (2). The sealing member (22) is provided with a channel which connects the air pipe interface (21) with the inner cavity of the piston cylinder (31). The piston sleeve (2) is vertically installed in the positioning hole. The air pipe interface (21) is connected to a negative pressure or positive pressure device through a pipeline. A counterweight loading member (4) is detachably installed on the piston connecting rod (33).

2. A gas piston pressure vacuum gauge according to claim 1, characterized in that: The other end of the piston sleeve (2) is open and is detachably provided with a locking member (5) for press-fitting with the other end of the piston cylinder (31).

3. A gas piston pressure vacuum gauge according to claim 2, characterized in that: The locking member (5) comprises a cylindrical limiting sleeve (51) and a limiting disc (52). One end of the limiting sleeve (51) is open, and the other end is provided with an opening in the middle. The inner wall of one end of the limiting sleeve (51) is provided with an internal thread, and the outer surface of the other end of the piston sleeve (2) is provided with an external thread. The limiting sleeve (51) is screwed onto the other end of the piston sleeve (2). The limiting disc (52) is provided with a notch (521) of uniform width from the center to the edge thereof. The width of the notch (521) is greater than the diameter of the piston connecting rod (33) and smaller than the diameter of the piston (32). The limiting disc (52) is sandwiched between the other end of the limiting sleeve (51) and the other end of the piston cylinder (31).

4. A gas piston pressure vacuum gauge according to claim 3, characterized in that: The counterweight loading member (4) is a disc-shaped weight, the center of the weight is provided with a through hole for the piston connecting rod (33) to pass through, the weight is provided with a gap with a width greater than the diameter of the piston connecting rod (33) from the center through hole to its edge, and limiting discs (331) are coaxially provided at both ends of the piston connecting rod (33), the weight is sleeved on the piston connecting rod (33), and the opening of the limiting sleeve (51) is circular, and its diameter is greater than the diameter of the limiting disc (331).

5. A gas piston pressure vacuum gauge according to claim 1, characterized in that: The support frame (1) comprises a bottom plate (11), a top plate (12) and a plurality of support columns (13); the bottom plate (11) is arranged horizontally, the top plate (12) is arranged parallel to the bottom plate (11), the plurality of support columns (13) are respectively vertically fixed between the bottom plate (11) and the top plate (12), and the plurality of support columns (13) are distributed around the edges of the bottom plate (11) and the top plate (12); the positioning hole is provided in the middle of the top plate (12).

6. A gas piston pressure vacuum gauge according to claim 5, characterized in that: The bottom plate (11) and the top plate (12) are both triangular plates, and the outer edges at the end corners are rounded. Three corresponding support columns (13) are provided and are distributed one by one at the three end corners of the bottom plate (11) and the top plate (12).

7. A gas piston pressure vacuum gauge according to claim 5, characterized in that: A level (6) is provided on the upper part of the top plate (12).

8. A gas piston pressure vacuum gauge according to claim 1, characterized in that: The bottom of the support frame (1) is provided with a plurality of height-adjustable support feet (7) at intervals.

9. A gas piston pressure vacuum gauge according to claim 1, characterized in that: The positioning hole is an internal threaded hole, an external thread is provided in the middle of the outer circumference of the piston sleeve (2), and the piston sleeve (2) is screwed into the internal threaded hole.

10. A gas piston pressure vacuum gauge according to any one of claims 1 to 9, characterized in that: A screw hole is provided in the middle of one end of the piston (32), one end of the piston connecting rod (33) is provided with a thread and screwed into the screw hole at one end of the piston (32), and the other end of the piston connecting rod (33) is detachably provided with an operating disk (332).

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