Pressure gauge calibration device

Abstract

The invention discloses a pressure gauge calibration device which comprises a base and a pressure regulating cylinder, a piston is arranged in the pressure regulating cylinder in a sliding sealing fit mode, a driving assembly is arranged on the pressure regulating cylinder, a mounting part is arranged on the base, a pressure release valve is arranged on the mounting part, and a pressurizing assembly, a pressure reducing assembly and an adjusting assembly are arranged on the pressure regulating cylinder. In the pressurizing state, the piston moves back and forth in the pressure adjusting cylinder so that gas in the gas compression space can be pressed into the mounting part, the internal pressure of the mounting part can be increased, and meanwhile external gas can be sucked into the gas expansion space; the piston moves back and forth in the pressure adjusting cylinder so that gas in the mounting part can be sucked into the gas expansion space, the pressure in the mounting part can be reduced, and meanwhile gas in the gas compression space can be exhausted. The objective of the invention is to solve the technical problem of tedious verification operation of existing equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of calibration equipment, and in particular relates to a pressure gauge calibration device. Background Art

[0002] Pressure gauge calibration is a key step in ensuring its measurement accuracy and reliability, and is widely used in industrial production, equipment maintenance and safety monitoring.

[0003] An existing pressure gauge calibration device includes a base and a pressure-regulating cylinder horizontally arranged on the base, a piston is arranged in the pressure-regulating cylinder, the piston is slidably and sealedly connected along the length direction of the pressure-regulating cylinder, a first screw rod is arranged inside the pressure-regulating cylinder, one end of the first screw rod is rotatably connected to one side of the piston, the other end of the first screw rod extends along the length direction of the pressure-regulating cylinder and passes through the outside of the pressure-regulating cylinder, the first screw rod and the pressure-regulating cylinder are connected by threaded fitting, the pressure-regulating cylinder is connected to two pressure output ports at one end away from the first screw rod, the two pressure output ports are respectively used to install the meter to be tested and the standard meter, a pressure-stabilizing valve is arranged at one end of the pressure-regulating cylinder away from the first screw rod, the pressure-stabilizing valve is used to isolate the two pressure output ports from the pressure-regulating cylinder to maintain the pressure of the two pressure output ports, and a pressure relief valve is arranged at one end of the pressure-regulating cylinder away from the first screw rod.

[0004] The above pressure gauge calibration equipment has the following defects: ① Before calibration, it is necessary to open the pressure regulating valve and the pressure relief valve to return the standard gauge and the gauge to be tested to zero, and then rotate the first screw rod to move the piston to the end of the pressure regulating cylinder (during positive pressure measurement, the piston moves to the end of the pressure regulating cylinder away from the pressure regulating valve; during negative pressure measurement, the piston moves to the end of the pressure regulating cylinder close to the pressure regulating valve). Since the first screw rod needs to be rotated before each operation to make the piston located at the end of the pressure regulating cylinder, the operation is relatively inconvenient.

[0005] ②. During negative pressure measurement, after the piston moves to the end of the pressure regulating cylinder close to the pressure stabilizing valve, the pressure relief valve is closed, and the first screw rod is rotated to make the piston slide inside the pressure regulating cylinder toward the end away from the pressure stabilizing valve. When the piston moves to the end of the pressure regulating cylinder away from the pressure stabilizing valve and the negative pressure measurement is not completed and the negative pressure operation needs to be continued, it is necessary to close the pressure stabilizing valve, open the pressure relief valve, rotate the first screw rod to make the piston return to the end of the pressure regulating cylinder close to the pressure stabilizing valve, and then close the pressure relief valve, open the pressure stabilizing valve, and rotate the first screw rod again to move the piston toward the end away from the pressure stabilizing valve to continue the negative pressure measurement. The operation is circulated until the negative pressure reaches the negative pressure indication end value of the meter to be measured. Such operation increases the complexity of the calibration process and increases the workload of the staff. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a pressure gauge calibration device to solve the technical problem that the calibration operation of the existing equipment is complicated.

[0007] To achieve the aforementioned object of the invention, the technical solution adopted by the present invention includes: a pressure gauge calibration device, comprising a base and a pressure regulating cylinder disposed on the base, wherein a sliding seal is configured inside the pressure regulating cylinder and a piston is cooperated with the pressure regulating cylinder, and a driving assembly is provided on the pressure regulating cylinder for driving the piston to slide back and forth inside the pressure regulating cylinder. When the piston moves inside the pressure regulating cylinder, a gas compression space and a gas expansion space are formed in the pressure regulating cylinder, and a mounting portion is provided on the base. The mounting portion is a hollow structure and is used to mount a standard gauge and a gauge to be inspected, and a pressure relief valve is provided on the mounting portion; The pressure regulating cylinder is provided with a pressurizing assembly, a decompressing assembly, and an adjusting assembly for switching between pressurized and decompressed states. Through the adjusting assembly, the pressure regulating cylinder and the mounting portion, as well as the pressure regulating cylinder and the external space, are connected via the pressurizing assembly to form a pressurized state. In the pressurized state, the back-and-forth movement of the piston in the pressure regulating cylinder can press the gas in the gas compression space into the mounting portion to increase the internal pressure, and at the same time can draw external gas into the gas expansion space. Through the adjustment component, the pressure regulating cylinder and the mounting part, as well as the pressure regulating cylinder and the external space are connected through the pressure reducing component to form a reduced pressure state. In the reduced pressure state, the back and forth movement of the piston in the pressure regulating cylinder can suck the gas in the mounting part into the gas expansion space to reduce the internal pressure of the mounting part, and at the same time can discharge the gas inside the gas compression space.

[0008] Compared with the prior art, the advantages of the present invention include: (1) The present invention provides a pressure gauge calibration device that utilizes a drive assembly to continuously drive a piston, causing it to slide back and forth within a pressure regulating cylinder. Based on this operating principle, it is theoretically possible to continuously pressurize the mounting portion, thereby driving the pressure within the mounting portion to continuously rise. This allows the gauge to be tested to accommodate a larger measurement range and provide greater applicability.

[0009] (2) The pressure gauge calibration device provided by the present invention is different from the existing equipment which can only increase the internal pressure by moving the piston in one direction and needs to perform a series of tedious operations after the piston reaches the end, namely closing the pressure regulating valve, opening the pressure relief valve, moving the piston back to the end away from the pressure regulating valve, closing the pressure relief valve and moving the piston back toward the pressure regulating valve to continue to increase the pressure. The present solution can achieve the purpose of continuous pressurization by driving the piston to move back and forth through the drive assembly, and the operation process is significantly simplified.

[0010] (3) The present invention provides a pressure gauge calibration device that, through a drive assembly, continuously reciprocates a piston, causing it to slide periodically within a pressure regulating cylinder. This device theoretically achieves continuous decompression of the mounting portion. During this process, the pressure within the mounting portion decreases as the piston continues to move, thereby broadening the measurement range of the pressure gauge to be tested and enhancing the device's adaptability to calibrating pressure gauges of varying ranges.

[0011] (4) The pressure gauge calibration device provided by the present invention, compared with the traditional equipment that relies on one-way piston movement to achieve pressure regulation (that is, the piston moves away from the pressure regulating valve to reduce the pressure. When the piston moves to the limit position of the pressure regulating cylinder, it is necessary to close the pressure regulating valve, open the pressure relief valve, reversely reset the piston and restart the pressure reduction process. The complex operation) is to maintain the pressure reduction by driving the piston to move back and forth in both directions through the driving component. This not only simplifies the operation process, but also improves the continuity of pressure regulation.

[0012] (5) The present invention provides a pressure gauge calibration device. Conventional equipment requires the piston to be pre-positioned before calibration (moving the piston to the end of the pressure regulating cylinder away from the pressure regulating valve for positive pressure measurement and to the end of the pressure regulating valve for negative pressure measurement). The present invention overcomes this limitation. Since the piston can achieve pressure regulation through bidirectional movement at any position within the pressure regulating cylinder, when the piston reaches the end of the pressure regulating cylinder, the pressure regulation capability can be restored by simply driving the piston in the reverse direction, without the need for an additional reset step. This "position-independent" regulation mechanism significantly improves the operational convenience of the device.

[0013] Further, the pressurizing assembly includes a first pressurizing pipe, a second pressurizing pipe, a third pressurizing pipe and a fourth pressurizing pipe, one end of the first pressurizing pipe and the second pressurizing pipe are respectively connected to the two ends of the pressure-regulating cylinder, the other ends of the first pressurizing pipe and the second pressurizing pipe can be connected to the mounting portion through the regulating assembly, the first pressurizing pipe and the second pressurizing pipe are respectively provided with a first one-way valve and a second one-way valve, the first one-way valve and the second one-way valve only allow gas to flow from the pressure-regulating cylinder to the mounting portion through the regulating assembly, one end of the third pressurizing pipe and the fourth pressurizing pipe are respectively connected to the two ends of the pressure-regulating cylinder, the other ends of the third pressurizing pipe and the fourth pressurizing pipe can be connected to the outside through the regulating assembly, the third pressurizing pipe and the fourth pressurizing pipe are respectively provided with a third one-way valve and a fourth one-way valve, the third one-way valve and the fourth one-way valve only allow gas to flow from the outside into the pressure-regulating cylinder through the regulating assembly; The pressure reducing assembly includes a first pressure reducing pipe, a second pressure reducing pipe, a third pressure reducing pipe and a fourth pressure reducing pipe, one end of the first pressure reducing pipe and the second pressure reducing pipe are respectively connected to the two ends of the pressure regulating cylinder, and the other ends of the first pressure reducing pipe and the second pressure reducing pipe can be connected to the mounting part through the adjusting assembly, and the first pressure reducing pipe and the second pressure reducing pipe are respectively provided with a fifth one-way valve and a sixth one-way valve, and the fifth one-way valve and the sixth one-way valve only allow gas to flow from the mounting part through the adjusting assembly to the pressure regulating cylinder, one end of the third pressure reducing pipe and the fourth pressure reducing pipe are respectively connected to the two ends of the pressure regulating cylinder, and the other ends of the third pressure reducing pipe and the fourth pressure reducing pipe can be connected to the outside through the adjusting assembly, and the third pressure reducing pipe and the fourth pressure reducing pipe are respectively provided with a seventh one-way valve and an eighth one-way valve, and the seventh one-way valve and the eighth one-way valve only allow gas to be discharged from the pressure regulating cylinder through the adjusting assembly.

[0014] Furthermore, the drive assembly includes a first screw rod, which is arranged on the pressure regulating cylinder along the axis of the pressure regulating cylinder and is rotatably connected to the pressure regulating cylinder. The first screw rod is sleeved outside the piston and is connected to the piston through a threaded fit. Sealing tubes are provided on both sides of the piston, and the two sealing tubes are both sleeved on the outside of the first screw rod. The opposite ends of the two sealing tubes are fixedly connected to the two sides of the piston respectively, and the opposite ends of the two sealing tubes extend toward the two ends of the pressure regulating cylinder respectively and extend out of the pressure regulating cylinder. Seals are provided between the two sealing tubes and the two ends of the pressure regulating cylinder.

[0015] Furthermore, a deceleration component is provided on the first screw rod for reducing the rotation speed of the first screw rod.

[0016] Furthermore, the reduction assembly includes a first gear coaxially fixedly connected to the screw rod, a second gear rotatably connected to the base, the second gear meshes with the first gear, and the diameter of the second gear is smaller than the diameter of the first gear, and a fine-tuning knob is provided on the second gear.

[0017] Furthermore, the mounting portion is a tubular structure, and the side wall of the mounting portion is sequentially provided with a first through hole, a second through hole, a third through hole, and a fourth through hole along its length direction; The regulating assembly includes a first tube body, the first tube body being fixed on the base, the first tube body being located outside the mounting portion, the first tube body being slidingly and sealingly connected to the mounting portion along the length direction of the mounting portion, the first pressurizing tube, the second pressurizing tube, the first pressure reducing tube and the second pressure reducing tube being connected to the first tube body at one end away from the pressure regulating cylinder, in a pressurized state, the first pressurizing tube and the second pressurizing tube are connected to the interior of the mounting portion through the second through hole and the fourth through hole respectively, in a decompressed state, the first pressure reducing tube and the second pressure reducing tube are connected to the interior of the mounting portion through the first through hole and the third through hole respectively, a strip through hole is opened on the first tube body along its length direction, the meter to be tested, the standard meter and the pressure relief valve are all connected to the interior of the mounting portion through the strip through hole; The regulating assembly further comprises a second tube body and a third tube body, the second tube body being fixed on the base, the second tube body being located outside the third tube body, the second tube body and the third tube body being slidably and sealedly connected along the length direction of the third tube body, the side wall of the third tube body being sequentially provided with a fifth through hole, a sixth through hole, a seventh through hole, and an eighth through hole corresponding to the positions of the first through hole, the second through hole, the third through hole, and the fourth through hole, the third pressure tube, the fourth pressure tube, the third pressure reducing tube, and the fourth pressure reducing tube being in communication with the second tube body at one end away from the pressure regulating cylinder, in a pressurized state, the third pressure tube and the fourth pressure reducing tube are respectively in communication with the interior of the third tube body through the sixth through hole and the eighth through hole, and in a decompressed state, the third pressure reducing tube and the fourth pressure reducing tube are respectively in communication with the interior of the third tube body through the fifth through hole and the seventh through hole, and the third tube body is provided with an air vent that is always in communication with the outside; The adjusting assembly also includes a second screw rod, a cross rod and two connecting rods, one end of the two connecting rods is connected to the mounting portion and the third tube body respectively, the other ends of the two connecting rods extend along the length direction of the mounting portion to pass through the first tube body and the second tube body respectively, and are fixedly connected to the two ends of the cross rod respectively, the second screw rod is passed through the cross rod and is connected to the cross rod by threaded fittings, and the second screw rod is rotatably connected to the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a structural diagram of the device under pressurized state; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure; Figure 3This is a structural diagram of the device in a decompression state; Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure.

[0020] Reference numerals: Base 1, pressure regulating cylinder 2, piston 3, mounting part 4, standard meter 5, meter to be inspected 6, pressure relief valve 7, first pressure pipe 8, second pressure pipe 9, third pressure pipe 10, fourth pressure pipe 11, first one-way valve 12, second one-way valve 13, third one-way valve 14, fourth one-way valve 15, first pressure reducing pipe 16, second pressure reducing pipe 17, third pressure reducing pipe 18, fourth pressure reducing pipe 19, fifth one-way valve 20, sixth one-way valve 21, seventh one-way valve 22, eighth one-way valve 23, first screw rod 24, sealing tube 25, sealing element 26, first gear 27, second gear 28, fine-tuning knob 29, first tube body 30, limit rod 31, second tube body 32, third tube body 33, second screw rod 34, cross rod 35, connecting rod 36. DETAILED DESCRIPTION

[0021] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principles, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0022] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, the present invention covers any substitution, modification, equivalent method and scheme made within the spirit, principle and scope of the present invention defined by the claims. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] In the description of this application, "first", "second", "third" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "a" or "an" and other similar words do not indicate a quantity limitation, but rather indicate the existence of at least one. "Include" or "comprising" and other similar words mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0024] In the description of this application, the terms "center," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Furthermore, when positional terms such as "both sides," "outside," "upper," and "lower" are used, they should be understood to be used solely to facilitate understanding and description, taking into account that the structure may be oriented in other directions.

[0025] In the description of this application, unless otherwise clearly specified and limited, the technical or scientific terms used should have the usual meanings understood by persons with ordinary skills in the field to which this application belongs. Terms such as "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection, or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] See also Figure 1-4 , the present invention provides a technical solution: a pressure gauge calibration device, such as Figure 1 As shown, it includes a base 1 and a pressure regulating cylinder 2, and the pressure regulating cylinder 2 is fixed on the base 1 along the horizontal direction. Figure 2 As shown, the pressure-regulating cylinder 2 is internally configured with a sliding seal and a piston 3. The pressure-regulating cylinder 2 is provided with a drive assembly for driving the piston 3 to slide back and forth within the pressure-regulating cylinder 2. When the piston 3 moves within the pressure-regulating cylinder 2, a gas compression space and a gas expansion space are formed within the pressure-regulating cylinder 2. Specifically, when the piston 3 moves to the left, the space to the left of the piston 3 within the pressure-regulating cylinder 2 forms a gas compression space, while the space to the right of the piston 3 forms a gas expansion space. Conversely, when the piston 3 moves to the right, the space to the right of the piston 3 within the pressure-regulating cylinder 2 becomes a gas compression space, while the space to the left of the piston 3 becomes a gas expansion space.

[0027] like Figure 1 As shown, the base 1 is provided with a mounting portion 4. This mounting portion 4 is a hollow structure and is used to mount a standard meter 5 and a meter to be tested 6. The standard meter 5 and the meter to be tested 6 are connected to the mounting portion 4 in parallel, and the pressures of the two are consistent. During the calibration process, by comparing the difference between the two readings, it can be determined whether the measurement error of the meter to be tested 6 is within the allowable range. If the reading error of the meter to be tested 6 exceeds the preset threshold, the pointer of the meter to be tested 6 can be manually adjusted to align its reading with that of the standard meter 5, thus completing the calibration.

[0028] like Figure 2As shown, the pressure regulating cylinder 2 is provided with a pressurizing component, a decompressing component and an adjusting component. The adjusting component serves as the core control unit, which can realize the switching of the pressurizing / decompressing mode and the corresponding change of the pressure path. When the adjusting component switches the device to the pressurizing state, the pressure regulating cylinder 2 establishes a dual gas path connection with the mounting part 4 and the external space through the pressurizing component: on the one hand, the gas compression space inside the pressure regulating cylinder 2 (i.e., the closed cavity in front of the moving direction of the piston 3) is connected with the inner cavity of the mounting part 4. When the piston 3 is pushed by the driving component, the gas in the gas compression space is forced into the mounting part 4, driving the pressure of the air chamber where the meter to be tested 6 and the standard meter 5 are located to rise. At the same time, the gas expansion space (the cavity in the rear of the moving direction of the piston 3) is connected with the external atmospheric environment. When the piston 3 moves backward, negative pressure is formed, and the external air is sucked into the gas expansion space to achieve gas replenishment.

[0029] Specifically, when the piston 3 moves to the left, the space on the left side of the piston 3 in the pressure-regulating cylinder 2 is compressed to form a gas compression space, and the internal pressure of the space increases accordingly, thereby pressing the gas in the gas compression space into the mounting portion 4, causing the gas pressure in the mounting portion 4 to increase. At the same time, the space on the right side of the piston 3 in the pressure-regulating cylinder 2 is expanded to form a gas expansion space, and its internal pressure decreases. At this time, external gas can be sucked into the gas expansion space in the pressure-regulating cylinder 2 through the adjusting component. It should be clear that in this process, the flow direction of the gas is unidirectional and fixed, that is, the gas in the gas compression space can only flow into the mounting portion 4, and the external gas can only flow into the gas expansion space.

[0030] Similarly, when piston 3 moves rightward, the space to the right of piston 3 within pressure-regulating cylinder 2 is compressed, forming a new gas compression space (the position of the gas compression space relative to piston 3 changes as the direction of piston 3's movement changes), increasing the internal pressure. This in turn compresses the gas within this gas compression space into mounting portion 4, further increasing the gas pressure within mounting portion 4. Simultaneously, the space to the left of piston 3 within pressure-regulating cylinder 2 expands, forming a new gas expansion space (similarly, the position of the gas expansion space relative to piston 3 changes as the direction of piston 3's movement changes), further increasing the internal pressure within mounting portion 4. At this point, external gas can be drawn into the gas expansion space within pressure-regulating cylinder 2 through the regulating assembly. Similarly, the gas flow remains unidirectional and fixed: gas within the gas compression space can only flow into mounting portion 4, and external gas can only flow into the gas expansion space. This ensures that gas within mounting portion 4 does not escape, thereby maintaining a stable internal pressure.

[0031] The drive assembly continuously drives piston 3, causing it to slide back and forth within pressure-regulating cylinder 2. Based on this operating principle, mounting portion 4 can theoretically be continuously pressurized, thereby driving the pressure within mounting portion 4 to continuously rise. This allows meter 6 to accommodate a wider measurement range and offer greater applicability.

[0032] Compared with the existing equipment, which can only increase the internal pressure by moving the piston in one direction, and needs to perform a series of cumbersome operations after the piston reaches the end - that is, closing the pressure-stabilizing valve, opening the pressure relief valve, moving the piston back to the end away from the pressure-stabilizing valve, and then closing the pressure relief valve and moving the piston back toward the pressure-stabilizing valve to continue increasing the pressure, this solution can achieve the purpose of continuous pressurization by driving the piston 3 to move back and forth through the drive component, and the operation process is significantly simplified.

[0033] like Figure 4 As shown, through the adjustment component, the pressure regulating cylinder 2 and the mounting portion 4, as well as the pressure regulating cylinder 2 and the external space are connected through the decompression component to form a decompression state. In the decompression state, the back and forth movement of the piston 3 in the pressure regulating cylinder 2 can suck the gas in the mounting portion 4 into the gas expansion space to reduce the internal pressure of the mounting portion 4, and at the same time can discharge the gas inside the gas compression space.

[0034] Specifically, when the piston 3 moves to the left, the space to the right of the piston 3 in the pressure-regulating cylinder 2 expands accordingly, forming a gas expansion space. At this time, the internal pressure of the space decreases, and under the action of the regulating component, the gas in the mounting portion 4 is directionally sucked into the gas expansion space, causing the gas pressure in the mounting portion 4 to drop accordingly. At the same time, the space to the left of the piston 3 in the pressure-regulating cylinder 2 is compressed due to the movement of the piston 3, forming a gas compression space, and its internal pressure increases accordingly, prompting the gas in the gas compression space to be discharged to the outside in a direction. It should be particularly emphasized that in the process of the piston 3 moving to the left, the gas flow direction is strictly unidirectional, that is, the gas in the mounting portion 4 only flows to the gas expansion space, and the gas in the gas compression space is only discharged outward, and external gas cannot flow back into the mounting portion 4.

[0035] Similarly, when the piston 3 moves to the right, the space on the left side of the piston 3 in the pressure-regulating cylinder 2 expands to form a gas expansion space, and the internal pressure decreases. Through the guidance of the regulating component, the gas in the mounting portion 4 is again directionally sucked into the gas expansion space, so that the pressure in the mounting portion 4 is further reduced. At the same time, the space on the right side of the piston 3 in the pressure-regulating cylinder 2 is compressed to form a gas compression space, and the internal pressure increases, driving the gas in the gas compression space to be discharged in a directional manner. During this process, the unidirectionality of the gas flow is still strictly maintained: the gas in the mounting portion 4 only flows into the gas expansion space in one direction, and the gas in the gas compression space is only discharged to the outside in one direction. External gas can never enter the mounting portion 4, thereby effectively ensuring the stability of the internal pressure environment of the mounting portion 4.

[0036] By continuously reciprocating piston 3 through the drive assembly, causing it to slide periodically within pressure-regulating cylinder 2, the mounting portion 4 can theoretically be continuously decompressed. During this process, the pressure within mounting portion 4 decreases as piston 3 continues to move, thereby broadening the measurement range of the pressure gauge under test and enhancing the device's adaptability to calibrating different pressure gauge ranges.

[0037] In addition, compared with traditional equipment that relies on one-way piston movement to achieve pressure regulation (that is, the piston moves away from the pressure-regulating valve to reduce the pressure. When the piston moves to the limit position of the pressure-regulating cylinder, it is necessary to close the pressure-regulating valve, open the pressure relief valve, reversely reset the piston and restart the pressure reduction process. This is a complex operation), the present invention drives the piston to move back and forth in both directions through a drive component to maintain pressure reduction, which not only simplifies the operating process, but also improves the continuity of pressure regulation.

[0038] Furthermore, conventional equipment requires pre-setting the piston before calibration (moving the piston to the end of the pressure regulating cylinder away from the pressure regulating valve for positive pressure measurements and closer to the pressure regulating valve for negative pressure measurements). The present invention overcomes this limitation. Since piston 3 can achieve pressure regulation through bidirectional motion from any position within pressure regulating cylinder 2, when piston 3 reaches the end of cylinder 2, pressure regulation is restored by simply driving it in the opposite direction, eliminating the need for an additional reset step. This "position-independent" regulation mechanism significantly enhances the device's ease of operation.

[0039] like Figure 2 As shown, in this embodiment, the pressurization assembly includes a first pressurization tube 8, a second pressurization tube 9, a third pressurization tube 10, and a fourth pressurization tube 11. One end of the first pressurization tube 8 and the second pressurization tube 9 are connected to both ends of the pressure regulating tube 2, respectively. The first pressurization tube 8 is located at the left end of the pressure regulating tube 2, and the second pressurization tube 9 is located at the right end of the pressure regulating tube 2. The other ends of the first pressurization tube 8 and the second pressurization tube 9 can be connected to the mounting portion 4 through the adjustment assembly. The first pressurization tube 8 and the second pressurization tube 9 are respectively provided with a first check valve 12 and a second check valve 13. The first check valve 12 and the second check valve 13 only allow gas to flow from the pressure regulating tube 2 through the adjustment assembly to the mounting portion 4. One end of the third pressurization tube 10 and the fourth pressurization tube 11 are connected to both ends of the pressure regulating tube 2, respectively. The third pressurization tube 10 is located at the left end of the pressure regulating tube 2, and the fourth pressurization tube 11 is located at the right end of the pressure regulating tube 2. The other ends of the third pressure pipe 10 and the fourth pressure pipe 11 can be connected to the outside through the regulating assembly. The third pressure pipe 10 and the fourth pressure pipe 11 are respectively provided with a third one-way valve 14 and a fourth one-way valve 15. The third one-way valve 14 and the fourth one-way valve 15 only allow gas to flow from the outside through the regulating assembly into the pressure regulating cylinder 2.

[0040] When the driving assembly drives the piston 3 to move to the left, the gas in the space on the left side of the piston 3 is pressed into the mounting part 4 through the first one-way valve 12. At the same time, the external gas enters the space on the right side of the piston 3 through the fourth one-way valve 15 to replenish the gas; when the piston 3 moves to the right, the gas in the space on the right side of the piston 3 is pressed into the mounting part 4 through the second one-way valve 13. At the same time, the external gas enters the space on the left side of the piston 3 through the third one-way valve 14 to replenish the gas. Such a cycle can achieve continuous pressurization of the gas.

[0041] like Figure 4 As shown, the pressure-reducing assembly includes a first pressure-reducing pipe 16, a second pressure-reducing pipe 17, a third pressure-reducing pipe 18, and a fourth pressure-reducing pipe 19. One end of the first pressure-reducing pipe 16 and the second pressure-reducing pipe 17 are connected to both ends of the pressure-regulating cylinder 2, respectively. The first pressure-reducing pipe 16 is located at the left end of the pressure-regulating cylinder 2, and the second pressure-reducing pipe 17 is located at the right end of the pressure-regulating cylinder 2. The other ends of the first and second pressure-reducing pipes 16 and 17 can communicate with the mounting portion 4 through the adjustment assembly. The first and second pressure-reducing pipes 16 and 17 are respectively provided with a fifth and a sixth check valve 20 and 21. The fifth and sixth check valves 20 and 21 only allow gas to flow from the mounting portion 4 through the adjustment assembly to the pressure-regulating cylinder 2. One end of the third and fourth pressure-reducing pipes 18 and 19 are connected to both ends of the pressure-regulating cylinder 2, respectively. The third pressure-reducing pipe 18 is located at the left end of the pressure-regulating cylinder 2, and the fourth pressure-reducing pipe 19 is located at the right end of the pressure-regulating cylinder 2. The other ends of the third pressure-reducing pipe 18 and the fourth pressure-reducing pipe 19 can be connected to the outside through the regulating assembly. The third pressure-reducing pipe 18 and the fourth pressure-reducing pipe 19 are respectively provided with a seventh one-way valve 22 and an eighth one-way valve 23. The seventh one-way valve 22 and the eighth one-way valve 23 only allow gas to be discharged from the pressure-regulating cylinder 2 through the regulating assembly.

[0042] When the driving assembly drives the piston 3 to move to the left, the gas in the space on the left side of the piston 3 is discharged outward through the seventh one-way valve 22. At the same time, the gas in the mounting part 4 is sucked into the space on the right side of the piston 3 through the sixth one-way valve 21. When the piston 3 moves to the right, the gas in the space on the right side of the piston 3 is discharged outward through the eighth one-way valve 23. At the same time, the gas in the mounting part 4 is sucked into the space on the right side of the piston 3 through the fifth one-way valve 20. This cycle can achieve continuous decompression of the gas.

[0043] like Figure 2 As shown, in this embodiment: the driving assembly includes a first screw rod 24, the first screw rod 24 is arranged on the pressure regulating cylinder 2 along the axis of the pressure regulating cylinder 2, the first screw rod 24 is rotatably connected to the pressure regulating cylinder 2, the first screw rod 24 is sleeved on the outside of the piston 3, and is connected to the piston 3 through a threaded connection. Rotating the first screw rod 24 can make the piston 3 move back and forth in the pressure regulating cylinder 2.

[0044] A sealing tube 25 is provided on both sides of the piston 3. Both sealing tubes 25 are sleeved outside the first screw rod 24. Opposite ends of the two sealing tubes 25 are fixedly connected to the two sides of the piston 3. The opposite ends of the two sealing tubes 25 extend toward the two ends of the pressure regulating tube 2 and extend outside the pressure regulating tube 2. The sealing tubes 25 can move along the length of the pressure regulating tube 2 with the piston 3. A sealing member 26 is provided between the two sealing tubes 25 and the two ends of the pressure regulating tube 2. Specifically, an opening is formed along the length of the end of the pressure regulating tube 2. The sealing member 26 is a sealing ring embedded in the opening and arranged around the opening. The ends of the sealing tubes 25 pass through the opening, and the outer wall of the sealing tube 25 abuts against the inner side of the sealing member 26. As the sealing tubes 25 move with the piston 3, the sealing member 26 always abuts against the sealing tube 25. Through the sealing member 26 and the sealing tube 25, the gas in the space on both sides of the piston 3 in the pressure regulating tube 2 is prevented from exchanging with the outside through the gap between the piston 3 and the first screw rod 24, thereby improving the sealing performance.

[0045] Furthermore, a limiting rod 31 is fixedly connected to the pressure regulating cylinder 2 along its length direction. The limiting rod 31 is passed through the piston 3 and is in sliding and sealing cooperation with the piston 3 .

[0046] like Figure 1 As shown, in this embodiment, a deceleration assembly is provided on the first screw rod 24 for slowing down the rotation speed of the first screw rod 24. The deceleration assembly can relatively slow down the rotation speed of the first screw rod 24, thereby achieving fine adjustment of the air pressure, so as to better control the air pressure to reach the calibration point of the meter to be tested 6.

[0047] Furthermore, the deceleration assembly includes a first gear 27 coaxially fixedly connected to the first screw rod 24, and a second gear 28 is rotatably connected to the base 1. The second gear 28 is engaged with the first gear 27, and the diameter of the second gear 28 is smaller than the diameter of the first gear 27. Since the diameter of the second gear 28 is smaller than the diameter of the first gear 27, the second gear 28 rotates n times and the first gear 27 rotates 1 time, n is greater than 1, and since the first gear 27 is coaxially fixedly connected to the first screw rod 24, the second gear 28 rotates n times and the first screw rod 24 rotates 1 time, n is greater than 1, thereby achieving the purpose of deceleration. A fine-tuning knob 29 is provided on the second gear 28, and by rotating the fine-tuning knob 29, the second gear 28 can be driven to rotate synchronously.

[0048] like Figure 2 and 4 As shown, in this embodiment: the mounting portion 4 is a tubular structure, and the side wall of the mounting portion 4 is sequentially provided with a first through hole, a second through hole, a third through hole and a fourth through hole along its length direction; The regulating assembly includes a first tube body 30, which is fixed on the base 1 and is located outside the mounting portion 4. The first tube body 30 and the mounting portion 4 are slidably and sealedly connected along the length direction of the mounting portion 4. The first pressurizing tube 8, the second pressurizing tube 9, the first pressure reducing tube 16 and the second pressure reducing tube 17 are all connected to the first tube body 30 at one end away from the pressure regulating cylinder 2. In the pressurized state, the first pressurizing tube 8 and the second pressurizing tube 9 are connected to the interior of the mounting portion 4 through the second through hole and the fourth through hole respectively. In the decompressed state, the first pressure reducing tube 16 and the second pressure reducing tube 17 are connected to the interior of the mounting portion 4 through the first through hole and the third through hole respectively. A strip through hole is opened on the first tube body 30 along its length direction. The meter to be tested 6, the standard meter 5 and the pressure relief valve 7 are all connected to the interior of the mounting portion 4 through the strip through hole; The regulating assembly also includes a second tube body 32 and a third tube body 33. The second tube body 32 is fixed on the base 1 and is located outside the third tube body 33. The second tube body 32 and the third tube body 33 are slidingly and sealedly connected along the length direction of the third tube body 33. The side wall of the third tube body 33 is sequentially opened with a fifth through hole, a sixth through hole, a seventh through hole, and an eighth through hole corresponding to the positions of the first through hole, the second through hole, the third through hole, and the fourth through hole along its length direction. The third pressurizing tube 10, the fourth pressurizing tube 11, the third pressure reducing tube 18, and the fourth pressure reducing tube 19 are all connected to the second tube body 32 at one end away from the pressure regulating cylinder 2. In the pressurized state, the third pressurizing tube 10 and the fourth pressurizing tube 11 are connected to the interior of the third tube body 33 through the sixth through hole and the eighth through hole respectively. In the decompressed state, the third pressure reducing tube 18 and the fourth pressure reducing tube 19 are connected to the interior of the third tube body 33 through the fifth through hole and the seventh through hole respectively. A vent that is always connected to the outside is opened on the third tube body 33.

[0049] The adjustment assembly also includes a second screw rod 34, a cross rod 35 and two connecting rods 36, one end of the two connecting rods 36 is connected to the mounting portion 4 and the third tube body 33 respectively, and the other ends of the two connecting rods 36 extend along the length direction of the mounting portion 4 to pass through the first tube body 30 and the second tube body 32 respectively, and are fixedly connected to the two ends of the cross rod 35 respectively. The second screw rod 34 is provided on the cross rod 35 and is connected to the cross rod 35 by threaded engagement. The second screw rod 34 is rotatably connected to the base 1.

[0050] By rotating the screw rod, the mounting portion 4 and the third tube body 33 can be synchronously driven to move. When the first pressurized tube 8 and the second pressurized tube 9 are connected to the interior of the mounting portion 4 through the second and fourth through holes, respectively, and the third pressurized tube 10 and the fourth pressurized tube 11 are connected to the interior of the third tube body 33 through the sixth and eighth through holes, respectively, a pressurized state is formed. When the first decompression tube 16 and the second decompression tube 17 are connected to the interior of the mounting portion 4 through the first and third through holes, respectively, and the third decompression tube 18 and the fourth decompression tube 19 are connected to the interior of the third tube body 33 through the fifth and seventh through holes, respectively, a decompression state is formed. The above arrangement conveniently realizes switching between the pressurized state and the decompression state.

[0051] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make some simple deductions or substitutions without departing from the concept of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pressure gauge calibration device, comprising a base and a pressure regulating cylinder disposed on the base, wherein a sliding seal is provided inside the pressure regulating cylinder and a piston is fitted therein, and characterized in that: The pressure regulating cylinder is provided with a driving assembly for driving the piston to slide back and forth inside the pressure regulating cylinder. When the piston moves inside the pressure regulating cylinder, a gas compression space and a gas expansion space are formed inside the pressure regulating cylinder. The base is provided with a mounting portion. The mounting portion is a hollow structure and is used to mount a standard meter and a meter to be tested. The mounting portion is provided with a pressure relief valve; The pressure regulating cylinder is provided with a pressurizing assembly, a decompressing assembly, and an adjusting assembly for switching between pressurized and decompressed states. Through the adjusting assembly, the pressure regulating cylinder and the mounting portion, as well as the pressure regulating cylinder and the external space, are connected via the pressurizing assembly to form a pressurized state. In the pressurized state, the back-and-forth movement of the piston in the pressure regulating cylinder can press the gas in the gas compression space into the mounting portion to increase the internal pressure, and at the same time can draw external gas into the gas expansion space. Through the adjustment component, the pressure regulating cylinder and the mounting part, as well as the pressure regulating cylinder and the external space are connected through the pressure reducing component to form a reduced pressure state. In the reduced pressure state, the back and forth movement of the piston in the pressure regulating cylinder can suck the gas in the mounting part into the gas expansion space to reduce the internal pressure of the mounting part, and at the same time can discharge the gas inside the gas compression space.

2. A pressure gauge calibration device according to claim 1, characterized in that: The pressurizing assembly includes a first pressurizing pipe, a second pressurizing pipe, a third pressurizing pipe and a fourth pressurizing pipe, one end of which is connected to the two ends of the pressure-regulating cylinder respectively, and the other end of the first pressurizing pipe and the second pressurizing pipe can be connected to the mounting portion through the regulating assembly, and a first one-way valve and a second one-way valve are respectively provided on the first pressurizing pipe and the second pressurizing pipe, and the first one-way valve and the second one-way valve only allow gas to flow from the pressure-regulating cylinder to the mounting portion through the regulating assembly, and one end of the third pressurizing pipe and the fourth pressurizing pipe are respectively connected to the two ends of the pressure-regulating cylinder, and the other end of the third pressurizing pipe and the fourth pressurizing pipe can be connected to the outside through the regulating assembly, and the third one-way valve and the fourth one-way valve are respectively provided on the third pressurizing pipe and the fourth pressurizing pipe, and the third one-way valve and the fourth one-way valve only allow gas to flow from the outside into the pressure-regulating cylinder through the regulating assembly; The pressure reducing assembly includes a first pressure reducing pipe, a second pressure reducing pipe, a third pressure reducing pipe and a fourth pressure reducing pipe, one end of the first pressure reducing pipe and the second pressure reducing pipe are respectively connected to the two ends of the pressure regulating cylinder, and the other ends of the first pressure reducing pipe and the second pressure reducing pipe can be connected to the mounting part through the adjusting assembly, and the first pressure reducing pipe and the second pressure reducing pipe are respectively provided with a fifth one-way valve and a sixth one-way valve, and the fifth one-way valve and the sixth one-way valve only allow gas to flow from the mounting part through the adjusting assembly to the pressure regulating cylinder, one end of the third pressure reducing pipe and the fourth pressure reducing pipe are respectively connected to the two ends of the pressure regulating cylinder, and the other ends of the third pressure reducing pipe and the fourth pressure reducing pipe can be connected to the outside through the adjusting assembly, and the third pressure reducing pipe and the fourth pressure reducing pipe are respectively provided with a seventh one-way valve and an eighth one-way valve, and the seventh one-way valve and the eighth one-way valve only allow gas to be discharged from the pressure regulating cylinder through the adjusting assembly.

3. A pressure gauge calibration device according to claim 2, characterized in that: The drive assembly includes a first screw rod, which is arranged on the pressure regulating cylinder along the axis of the pressure regulating cylinder and is rotatably connected to the pressure regulating cylinder. The first screw rod is sleeved outside the piston and is connected to the piston through a threaded fit. Sealing tubes are provided on both sides of the piston, and the two sealing tubes are both sleeved on the outside of the first screw rod. The opposite ends of the two sealing tubes are fixedly connected to the two sides of the piston respectively, and the opposite ends of the two sealing tubes extend toward the two ends of the pressure regulating cylinder respectively and extend out of the pressure regulating cylinder. Seals are provided between the two sealing tubes and the two ends of the pressure regulating cylinder.

4. A pressure gauge calibration device according to claim 3, characterized in that: The first screw rod is provided with a deceleration component for slowing down the rotation speed of the first screw rod.

5. A pressure gauge calibration device according to claim 4, characterized in that: The reduction assembly includes a first gear coaxially fixedly connected to the screw rod, a second gear rotatably connected to the base, the second gear meshes with the first gear, and the diameter of the second gear is smaller than the diameter of the first gear. A fine-tuning knob is provided on the second gear.

6. A pressure gauge calibration device according to claim 5, characterized in that: The mounting portion is a tubular structure, and the side wall of the mounting portion is sequentially provided with a first through hole, a second through hole, a third through hole, and a fourth through hole along its length direction; The regulating assembly includes a first tube body, the first tube body being fixed on the base, the first tube body being located outside the mounting portion, the first tube body being slidingly and sealingly connected to the mounting portion along the length direction of the mounting portion, the first pressurizing tube, the second pressurizing tube, the first pressure reducing tube and the second pressure reducing tube being connected to the first tube body at one end away from the pressure regulating cylinder, in a pressurized state, the first pressurizing tube and the second pressurizing tube are connected to the interior of the mounting portion through the second through hole and the fourth through hole respectively, in a decompressed state, the first pressure reducing tube and the second pressure reducing tube are connected to the interior of the mounting portion through the first through hole and the third through hole respectively, a strip through hole is opened on the first tube body along its length direction, the meter to be tested, the standard meter and the pressure relief valve are all connected to the interior of the mounting portion through the strip through hole; The regulating assembly further comprises a second tube body and a third tube body, the second tube body being fixed on the base, the second tube body being located outside the third tube body, the second tube body and the third tube body being slidably and sealedly connected along the length direction of the third tube body, the side wall of the third tube body being sequentially provided with a fifth through hole, a sixth through hole, a seventh through hole, and an eighth through hole corresponding to the positions of the first through hole, the second through hole, the third through hole, and the fourth through hole, the third pressure tube, the fourth pressure tube, the third pressure reducing tube, and the fourth pressure reducing tube being in communication with the second tube body at one end away from the pressure regulating cylinder, in a pressurized state, the third pressure tube and the fourth pressure reducing tube are respectively in communication with the interior of the third tube body through the sixth through hole and the eighth through hole, and in a decompressed state, the third pressure reducing tube and the fourth pressure reducing tube are respectively in communication with the interior of the third tube body through the fifth through hole and the seventh through hole, and the third tube body is provided with an air vent that is always in communication with the outside; The adjusting assembly also includes a second screw rod, a cross rod and two connecting rods, one end of the two connecting rods is connected to the mounting portion and the third tube body respectively, the other ends of the two connecting rods extend along the length direction of the mounting portion to pass through the first tube body and the second tube body respectively, and are fixedly connected to the two ends of the cross rod respectively, the second screw rod is passed through the cross rod and is connected to the cross rod by threaded fittings, and the second screw rod is rotatably connected to the base.

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