A pressure regulator and pressure checking device

Abstract

The utility model discloses a kind of pressure regulator and pressure calibration device, pressure regulator is installed on calibration platform, including pressure regulating cylinder, pressure regulating piece, screw rod, nut, transmission structure, rotating shaft and mounting seat;Pressure regulating cylinder is communicated in pressure pipeline;One end of pressure regulating piece is telescopically arranged in pressure regulating cylinder, other end is connected in nut;Screw rod and rotating shaft are rotatably installed on mounting seat respectively, and are set in staggered position;Transmission structure is drivingly connected between screw rod and rotating shaft;The rotating shaft rotates, screw rod is driven to rotate by transmission structure, and under the thread cooperation of nut and screw rod, the rotational movement of screw rod is converted into the linear motion of pressure regulating piece along pressure regulating cylinder, to adjust the pressure of pressure pipeline.The pressure regulator and pressure calibration device of the utility model are more labor-saving compared with traditional pressure calibrator, fine pressure regulation is realized simultaneously, and the accuracy of pressure instrument calibration is further improved.

Description

Technical Field

[0001] This utility model relates to the field of pressure calibration technology, and in particular to a pressure regulator and pressure calibration device. Background Technology

[0002] Pressure gauges used in industrial production and pressure measurement require calibration after a period of use to determine their accuracy. This is typically achieved using a pressure calibrator, which can generate and apply pressure to measuring instruments within a range from negative to high pressure, and can perform precise pressure regulation for measurement and on-site calibration. Existing pressure calibrators usually utilize a pre-pressurization pump with a lever that moves up and down, driving a plunger in a sealing mechanism to reciprocate and compress the extracted pressure medium into the sealed detection circuit, generating pre-pressure. Then, another pressure regulator, whose screw rotates, drives the plunger in the sealing mechanism to reciprocate, finely adjusting the pre-pressure and applying it to the instrument's detection circuit for testing the pressure measuring instrument.

[0003] Traditional pressure calibrators have a screw with a handle directly attached to its end, allowing operators to rotate the screw. However, under high pressure, the pressure resistance on the screw increases with the pressure in the plunger chamber. To achieve the desired high pressure, operators need to exert considerable force to rotate the screw. Furthermore, for fine pressure adjustments, the plunger moves a significant amount of material with each screw rotation, making direct screw rotation a crude and inefficient method for precise pressure control. Therefore, existing pressure calibrators are both laborious and lack precision in pressure adjustment. Utility Model Content

[0004] The purpose of this invention is to provide a pressure regulator and a pressure calibration device that can solve the problem of laborious pressure regulation in traditional pressure calibrators, while achieving precise pressure regulation.

[0005] To solve the above problems, the present invention adopts the following technical solution: The first aspect of this utility model provides a pressure regulator, which is installed on a calibration bench and includes a pressure regulating cylinder, a pressure regulating component, a screw, a nut, a transmission structure, a rotating shaft, and a mounting base. The pressure regulating cylinder is connected to the pressure pipeline; One end of the pressure regulating component is retractably disposed in the pressure regulating cylinder, and the other end is connected to a nut; The screw and the rotating shaft are rotatably mounted on the mounting base and are offset from each other. The transmission structure is connected between the screw and the rotating shaft. The rotating shaft rotates, driving the screw to rotate through the transmission structure. Under the threaded engagement of the nut and the screw, the rotational motion of the screw is converted into the linear motion of the pressure regulating component along the pressure regulating cylinder, thereby adjusting the pressure of the pressure pipeline.

[0006] Furthermore, the transmission structure includes a first gear and a second gear. The center of the first gear is fixedly connected to the screw, and the center of the second gear is fixedly connected to the rotating shaft. The diameter of the first gear is larger than the diameter of the second gear.

[0007] Furthermore, the outer edge of the first gear meshes with the outer edge of the second gear; or the first gear and the second gear are linked by a synchronous belt.

[0008] Furthermore, the mounting base includes a first mounting plate, a second mounting plate, and a supporting side plate. The supporting side plate is supported and connected between the first mounting plate and the second mounting plate. The first mounting plate has a first through hole. The end of the screw away from the pressure regulating cylinder passes through the first through hole and is connected to the center of the first gear. The second mounting plate extends above the calibration platform and has a second through hole. One end of the rotating shaft passes through the second through hole and is connected to the center of the second gear, and the other end is fixedly connected to a rotating handle.

[0009] Furthermore, the pressure regulating component includes a piston, a piston rod, and a connecting member; the piston is movable within the pressure regulating cylinder, one end of the piston rod is fixedly connected to the piston, and the other end is fixedly connected to the connecting member; the end of the connecting member away from the piston rod is fixedly connected to a nut; or The pressure regulating component includes a plunger and a connector; one end of the plunger is movable in the pressure regulating cylinder, and a sealing ring is embedded in the inner wall of the pressure regulating cylinder near the mounting base to seal the gap between the plunger and the pressure regulating cylinder; the other end of the plunger is connected to a nut through the connector.

[0010] Furthermore, the connector is in the shape of a hollow cylinder, and is sleeved on the outside of the screw and moves in a telescopic motion relative to the screw.

[0011] Furthermore, the pressure regulator also includes a guide assembly, which includes a guide support and a guide rod. The guide support is fixed on the calibration platform, and the guide rod is parallel to the screw. One end of the guide rod is fixed to the guide support, and the other end extends toward the mounting base. A nut is fitted onto the guide rod.

[0012] Furthermore, the nut or pressure regulating component is provided with an identification mark, and the test bench is provided with a corresponding viewing window. The position of the identification mark in the viewing window reflects the pressure regulating position relationship between the pressure regulating component and the pressure regulating cylinder.

[0013] This utility model also proposes a pressure calibration device, including a calibration platform, a pressure pipeline, a pressure interface, and the aforementioned pressure regulator. The pressure pipeline and the pressure interface are respectively installed on the calibration platform. The pressure interface is connected to the pressure regulating cylinder of the pressure regulator through the pressure pipeline. The pressure interface is used to connect the pressure instrument to be tested.

[0014] Furthermore, the pressure calibration device also includes a pre-pressure pump and a pressure relief valve; the pre-pressure pump is connected to the pressure pipeline and is used to provide pre-pressure to the pressure pipeline; one end of the pressure relief valve is connected to the pressure pipeline and the other end is connected to the atmosphere, and is used to relieve pressure on the pressure pipeline.

[0015] By adopting the above technical solution, this utility model has the following advantages: This utility model discloses a pressure regulator and pressure calibration device. By adding a transmission structure between the screw and the rotating shaft, the screw can rotate only once for every multiple rotations of the rotating shaft, thus reducing the speed of pressure regulation and achieving a precise pressure regulation effect. Simultaneously, under the action of the transmission structure, a small rotational force can be applied to the rotating shaft to drive the screw to rotate, achieving a labor-saving pressure regulation effect and reducing the workload of workers.

[0016] Compared to traditional pressure calibration devices, the pressure calibration device of this invention does not require the rotating handle to extend beyond the outer edge of the table. Moreover, pressure adjustment can be performed by rotating the rotating handle regardless of where it is placed on the table. This helps to ensure the neatness of the equipment placement in the calibration environment and avoids collisions between the pressure calibration device and pedestrians or objects. Attached Figure Description

[0017] Figure 1 This is a perspective view of a pressure calibration device according to one embodiment of the present invention; Figure 2 yes Figure 1 The pressure calibration device shown is a three-dimensional schematic diagram omitting the platform. Figure 3 This is a perspective view of a voltage regulator according to one embodiment of the present invention; Figure 4 yes Figure 3 The exploded 3D view of the voltage regulator is shown.

[0018] Figure label: Pressure calibration device 100; Pressure regulator 10, pressure regulating cylinder 11, pressure regulating component 12, piston 121, piston rod 122, connector 123, screw 13, nut 14, transmission structure 15, first gear 151, second gear 152, rotating shaft 16, mounting base 17, first mounting plate 171, first through hole 1711, second mounting plate 172, second through hole 1721, support side plate 173, rotating handle 18, guide assembly 19, guide support 191, guide rod 192; Verification table 20, tabletop 21, viewing window 211; Pressure piping 30; Pressure interface 40; Pre-pressure pump 60; Pressure relief valve 70; Stop valve 80. Detailed Implementation

[0019] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1 and Figure 2 As shown, this utility model proposes a pressure calibration device 100, including a pressure regulator 10, a calibration platform 20, a pressure pipeline 30, and a pressure interface 40. The pressure pipeline 30 and the pressure interface 40 are respectively installed on the calibration platform 20. The pressure interface 40 is connected to the pressure regulating cylinder 11 of the pressure regulator 10 through the pressure pipeline 30. The pressure interface 40 is used to connect the pressure instrument to be tested.

[0021] It is understood that there are multiple pressure ports 40, which are spaced out at different positions on the pressure pipeline 30 to connect multiple pressure gauges or pressure standard gauges to be tested.

[0022] The pressure calibration device 100 also includes a pre-pressure pump 60 and a pressure relief valve 70; the pre-pressure pump 60 is connected to the pressure pipeline 30 and is used to provide pre-pressure to the pressure pipeline 30; one end of the pressure relief valve 70 is connected to the pressure pipeline 30 and the other end is connected to the atmosphere, and is used to relieve pressure on the pressure pipeline 30.

[0023] It is understood that the pressure calibration device 100 also includes a shut-off valve 80, which is installed on the pressure pipeline 30 between the pre-pressurization pump 60 and the pressure regulator 10. After the pre-pressurization pump 60 completes the pre-pressurization of the pressure medium in the pressure pipeline 30 and the pressure regulating cylinder 11 of the pressure regulator 10, closing the shut-off valve 80 can prevent the pressure medium from returning to the pre-pressurization pump 60 through the pressure pipeline 30 during the pressure regulation process, and maintain the pressure regulator 10 in a sealed and limited pressure regulation space, thereby facilitating the pressure regulator 10 to perform precise pressure regulation.

[0024] Please combine further Figure 3 and Figure 4 The pressure regulator 10 is installed on the calibration table 20 and includes a pressure regulating cylinder 11, a pressure regulating component 12, a screw 13, a nut 14, a transmission structure 15, a rotating shaft 16, and a mounting base 17. The pressure regulating cylinder 11 is connected to the pressure pipeline; One end of the pressure regulating component 12 is retractably disposed in the pressure regulating cylinder 11, and the other end is connected to the nut 14; The screw 13 and the rotating shaft 16 are rotatably mounted on the mounting base 17 and are staggered. The transmission structure 15 is connected between the screw 13 and the rotating shaft 16. The rotating shaft 16 rotates, driving the screw 13 to rotate through the transmission structure 15. Under the threaded engagement of the nut 14 and the screw 13, the rotational motion of the screw 13 is converted into the linear motion of the pressure regulating component 12 along the pressure regulating cylinder 11, so as to regulate the pressure of the pressure pipeline.

[0025] In a specific embodiment, the size of the pressure regulating component 12 is adapted to the size of the pressure regulating cylinder 11. When the pressure regulating component 12 is installed in the pressure regulating cylinder 11, the pressure regulating component 12 and the pressure regulating cylinder 11 are in close contact, ensuring that the pressure regulating component 12 does not leak air or liquid when it moves axially linearly relative to the pressure regulating cylinder 11. Meanwhile, due to the friction between the pressure regulating component 12 and the pressure regulating cylinder 11, when the screw 13 rotates, the friction between the pressure regulating component 12 and the pressure regulating cylinder 11 will prevent the nut 14 from rotating synchronously with the screw 13, thus keeping the nut 14 circumferentially tight. However, due to the threaded fit between the screw 13 and the nut 14, the nut 14 will undergo axial linear motion, which will drive the pressure regulating component 12 to move linearly along the pressure regulating cylinder 11. This linear motion manifests in two opposite directions: First, when the nut 14 moves toward the pressure regulating cylinder 11, the pressure medium in the pressure regulating cylinder 11 is compressed, thereby achieving pressure increase regulation of the pressure pipeline; Second, when the nut 14 moves away from the pressure regulating cylinder 11, the pressure medium in the pressure regulating cylinder 11 is contracted, thereby achieving pressure decrease regulation of the pressure pipeline.

[0026] Furthermore, the transmission structure 15 includes a first gear 151 and a second gear 152. The center of the first gear 151 is fixedly connected to the screw 13, and the center of the second gear 152 is fixedly connected to the rotating shaft 16. The diameter of the first gear 151 is larger than the diameter of the second gear 152.

[0027] Furthermore, the outer edge of the first gear 151 meshes with the outer edge of the second gear 152; or the first gear 151 and the second gear 152 are linked by a synchronous belt.

[0028] It is understandable that, since the diameter of the first gear 151 is larger than the diameter of the second gear 152, the first gear 151 can only be rotated once by rotating the second gear 152 n times, thus reducing the speed of voltage adjustment. At the same time, by applying a small force to rotate the small-diameter second gear 152, the large-diameter first gear 151 can be driven, achieving the effect of labor-saving voltage adjustment.

[0029] Furthermore, the mounting base 17 includes a first mounting plate 171, a second mounting plate 172, and a supporting side plate 173. The supporting side plate 173 is supported and connected between the first mounting plate 171 and the second mounting plate 172. The first mounting plate 171 has a first through hole 1711. The end of the screw 13 away from the pressure regulating cylinder 11 passes through the first through hole 1711 and is connected to the center of the first gear 151. The second mounting plate 172 extends above the calibration platform 20 and has a second through hole 1721. One end of the rotating shaft 16 passes through the second through hole 1721 and is connected to the center of the second gear 152. The other end is fixedly connected to a rotating handle 18.

[0030] It's understandable that to save effort, the handles of traditional pressure regulators or pressure calibration devices are typically quite large. These handles are directly connected to the screw, allowing the screw to rotate directly by turning the handle. However, since the radius of the handle is usually larger than the height (or thickness) of the calibration table, if the table is placed on a tabletop, the handle will be obstructed and unable to rotate. Therefore, traditional pressure regulators or pressure calibration devices placed on a tabletop require careful positioning, with the handle extending beyond the tabletop's edge before it can be rotated for pressure adjustment. This reduces the operator's experience. Furthermore, the handle extending beyond the tabletop makes it difficult to maintain the neatness of equipment in the calibration area and increases the risk of collisions with the pressure regulator or pressure calibration device from pedestrians or other objects. This invention extends the second through hole 1721 on the mounting base 17 above the calibration table 20, and the rotating shaft 16 passes through the second through hole 1721 and is fixedly connected to the rotating handle 18. The center of the rotating handle 18 is raised above the calibration table 20, and the vertical distance between the center of the rotating handle 18 and the bottom of the calibration table 20 is greater than the radius of the rotating handle 18. Therefore, compared with traditional pressure calibration devices, the pressure calibration device 100 of this invention does not require the rotating handle 18 to extend beyond the outer edge of the table, and pressure adjustment can be performed by rotating the rotating handle 18 regardless of its placement on the table. This helps to ensure the neatness of the equipment placement in the calibration environment and avoids collisions between pedestrians or objects and the pressure calibration device 100.

[0031] Furthermore, the pressure regulating component 12 includes a piston 121, a piston rod 122, and a connecting component 123; the piston 121 is movable within the pressure regulating cylinder 11; one end of the piston rod 122 is fixedly connected to the piston 121, and the other end is fixedly connected to the connecting component 123; the end of the connecting component 123 away from the piston rod 122 is fixedly connected to a nut 14; or The pressure regulating component 12 includes a plunger and a connector 123; one end of the plunger is movable in the pressure regulating cylinder 11, and a sealing ring is embedded in the inner wall of the pressure regulating cylinder 11 near the mounting base 17 to seal the gap between the plunger and the pressure regulating cylinder 11; the other end of the plunger is connected to the nut 14 through the connector 123.

[0032] It is understandable that the connector 123 and the piston rod 122 or plunger can be separate parts or a single piece.

[0033] Furthermore, the connector 123 is in the shape of a hollow cylinder, and the connector 123 is sleeved on the outside of the screw 13 and moves in a telescopic motion relative to the screw 13.

[0034] It is understandable that by setting the connector 123 to a hollow cylindrical shape, the connector 123 can effectively avoid being positioned relative to the screw 13 when the nut 14 moves linearly back and forth relative to the screw 13. At the same time, the cylindrical shape of the connector 123 also helps to keep the piston rod 122 or plunger, the connector 123, the screw 13, and the nut 14 coaxially aligned, thereby preventing the nut 14 from tilting relative to the connector 123 and the connector 123 from tilting relative to the piston rod 122 or plunger due to the connector 123 being off-axis, which would affect the stable high-pressure regulation.

[0035] Furthermore, the voltage regulator 10 also includes a guide assembly 19, which includes a guide support 191 and a guide rod 192. The guide support 191 is fixed on the calibration table, and the guide rod 192 is parallel to the screw 13. One end of the guide rod 192 is fixed to the guide support 191, and the other end extends toward the mounting base 17. The nut 14 is sleeved on the guide rod 192.

[0036] It can be understood that there are two guide rods 192, which are located parallel to each other on both sides of the screw 13. Two guide holes are opened on both sides of the nut 14. The nut 14 is sleeved on the two guide rods 192 through the two guide holes, so as to restrict the nut 14 to only move in a straight line relative to the screw 13, and not to rotate circumferentially with the screw 13.

[0037] Furthermore, the nut 14 or the pressure regulating component 12 is provided with an identification position (not shown in the figure), and the table surface 21 of the calibration table 20 is provided with a corresponding viewing window 211. The position of the identification position in the viewing window 211 reflects the pressure regulating position relationship between the pressure regulating component 12 and the pressure regulating cylinder 11.

[0038] It is understood that a corresponding fixed marking position can be set on the nut 14 or the connecting part 123 of the pressure regulating component 12. Since the piston 121 or plunger of the pressure regulating component 12 is synchronously linked with the nut 14 or the connecting part 123 of the pressure regulating component 12, the position of the head of the piston 121 or plunger of the pressure regulating component 12 in the pressure regulating cylinder 11 can be reflected by the marking position on the connecting part 123 of the nut 14 or the pressure regulating component 12. Furthermore, a long strip-shaped viewing window 211 is provided on the table surface 21 of the calibration table 20. In a specific embodiment, the operator cannot directly see the position of the head of the piston 121 or plunger in the pressure regulating cylinder 11. When the head of the piston 121 or plunger of the pressure regulating component 12 is at the bottom of the pressure regulating cylinder 11 (i.e., the side away from the mounting base 17), it is impossible to continue increasing the pressure. The indicator visible through the viewing window 211 of the tabletop 21, located at the end of the elongated viewing window 211 away from the mounting base 17, serves as feedback to the operator that the head of the piston 121 or plunger has moved to the bottom of the pressure regulating cylinder 11 and cannot continue increasing the pressure. When the head of the piston 121 or plunger of the pressure regulating component 12 is at the top of the pressure regulating cylinder 11 (i.e., the side close to the mounting base 17), it is impossible to continue decreasing the pressure. The indicator visible through the viewing window 211 of the tabletop 21, located at the end of the elongated viewing window 211 close to the mounting base 17, serves as feedback to the operator that the head of the piston 121 or plunger has moved to the top of the pressure regulating cylinder 11 and cannot continue decreasing the pressure. However, according to the needs of the staff for inspection, the pre-pressurization pump 60 usually pre-pressurizes the pressure pipeline 30 to bring it to near the target pressure, and then fine-tunes it through the pressure regulator 10. Therefore, in order to provide more sufficient pressure adjustment space (i.e., fine adjustment of pressure increase or decrease), it is usually necessary to position the head of the piston 121 or plunger in the middle of the pressure regulating cylinder 11 before inspection. To facilitate the staff to confirm whether the head of the piston 121 or plunger is in the middle of the pressure regulating cylinder 11, this can be determined by whether the indicator is in the middle of the viewing window 211.

[0039] Preferably, the viewing window 211 is covered with a transparent cover to prevent oil or dust on the table surface 211 from entering the calibration table 20 through the viewing window 211.

[0040] To further illustrate the technical solution of this utility model, the working principle of the pressure calibration device 100 of this utility model is described below.

[0041] First, before calibration, the pressure regulator 10 needs to be reset to its initial position. This can be determined by observing whether the indicator is centered in the viewing window 211. If not, adjust by rotating the handle 18 until the indicator is centered in the viewing window 211. Then, install the pressure gauge to be tested and the standard pressure gauge on their respective pressure ports 40. Next, the operator uses the pre-pressurization pump 60 to pre-pressurize the pressure line 30 to near the target pressure. Then, close the shut-off valve 80. The operator then finely adjusts the pressure in the pressure line 30 using the pressure regulator 10. When the first gear 151 and the second gear 152 are engaged, if the pressure is lower than the target pressure, the handle 18 is rotated clockwise, simultaneously driving the rotating shaft 16 and the second gear 152 to rotate clockwise. Under the action of meshing, the second gear 152 drives the first gear 151 to rotate counterclockwise, and the first gear 151 simultaneously drives the screw 13 to rotate counterclockwise. Under the action of the threaded engagement between the nut 14 and the screw 13, the nut 14 is driven to move towards the pressure regulating cylinder 11, which in turn drives the head of the piston 121 or plunger to move towards the bottom of the pressure regulating cylinder 11, thereby compressing the volume of the pressure medium in the pressure regulating cylinder 11 and increasing the pressure over time. Similarly, if the pressure is higher than the target pressure, the handle 18 is rotated counterclockwise to achieve pressure reduction.

[0042] It is understandable that, in order to maintain the operator's habit of rotating the handle clockwise to increase pressure and counterclockwise to decrease pressure, when the first gear 151 and the second gear 152 are engaged, the thread on the screw 13 is a forward thread; when the first gear 151 and the second gear 152 are driven by a synchronous belt, the thread on the screw 13 is a reverse thread. It is understood that the aforementioned forward and reverse threads are relative.

[0043] The pressure regulator 10 and pressure calibration device 100 of this invention, by adding a transmission structure between the screw and the rotating shaft, reduce the speed of pressure adjustment and achieve a precise pressure adjustment effect by allowing the screw to rotate only once for every n rotations of the rotating shaft. Simultaneously, under the action of the transmission structure, a small rotational force can be applied to the rotating shaft to drive the screw to rotate, achieving a labor-saving pressure adjustment effect and reducing the workload of workers.

[0044] The above embodiments are not intended to limit the shape, material, structure, etc. of this utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A voltage regulator, mounted on a calibration bench, characterized in that, Includes pressure regulating cylinder, pressure regulating component, screw, nut, transmission structure, rotating shaft and mounting base; The pressure regulating cylinder is connected to the pressure pipeline; One end of the pressure regulating component is retractably disposed in the pressure regulating cylinder, and the other end is connected to a nut; The screw and the rotating shaft are rotatably mounted on the mounting base and are offset from each other. The transmission structure is connected between the screw and the rotating shaft. The rotating shaft rotates, driving the screw to rotate through the transmission structure. Under the threaded engagement of the nut and the screw, the rotational motion of the screw is converted into the linear motion of the pressure regulating component along the pressure regulating cylinder, thereby adjusting the pressure of the pressure pipeline.

2. A voltage regulator according to claim 1, characterized in that, The transmission structure includes a first gear and a second gear. The center of the first gear is fixedly connected to the screw, and the center of the second gear is fixedly connected to the rotating shaft. The diameter of the first gear is larger than the diameter of the second gear.

3. A voltage regulator according to claim 2, characterized in that, The outer edge of the first gear meshes with the outer edge of the second gear; or the first gear and the second gear are linked by a synchronous belt.

4. A voltage regulator according to claim 3, characterized in that, The mounting base includes a first mounting plate, a second mounting plate, and a supporting side plate. The supporting side plate is connected between the first mounting plate and the second mounting plate. The first mounting plate has a first through hole. The end of the screw away from the pressure regulating cylinder passes through the first through hole and is fixedly connected to the center of the first gear. The second mounting plate extends above the calibration platform and has a second through hole. One end of the rotating shaft passes through the second through hole and is connected to the center of the second gear, and the other end is fixedly connected to a rotating handle.

5. A voltage regulator according to claim 1, characterized in that, The pressure regulating component includes a piston, a piston rod, and a connecting member; the piston is movable within the pressure regulating cylinder; one end of the piston rod is fixedly connected to the piston, and the other end is fixedly connected to the connecting member; the end of the connecting member away from the piston rod is fixedly connected to a nut; or The pressure regulating component includes a plunger and a connector; one end of the plunger is movable in the pressure regulating cylinder, and a sealing ring is embedded in the inner wall of the pressure regulating cylinder near the mounting base to seal the gap between the plunger and the pressure regulating cylinder; the other end of the plunger is connected to a nut through the connector.

6. A voltage regulator according to claim 5, characterized in that, The connector is in the shape of a hollow cylinder, and it is sleeved on the outside of the screw and moves in a telescopic motion relative to the screw.

7. A voltage regulator according to claim 1, characterized in that, The voltage regulator also includes a guide assembly, which includes a guide support and a guide rod. The guide support is fixed on the calibration platform, and the guide rod is parallel to the screw. One end of the guide rod is fixed to the guide support, and the other end extends toward the mounting base. A nut is fitted onto the guide rod.

8. A voltage regulator according to claim 1, characterized in that, The nut or pressure regulating component is provided with an identification mark, and the test bench is provided with a corresponding viewing window. The position of the identification mark in the viewing window reflects the pressure regulating position relationship between the pressure regulating component and the pressure regulating cylinder.

9. A pressure calibration device, characterized in that, It includes a calibration bench, pressure pipeline, pressure interface, and a pressure regulator as described in any one of claims 1 to 8. The pressure pipeline and pressure interface are respectively installed on the calibration bench. The pressure interface is connected to the pressure regulating cylinder of the pressure regulator through the pressure pipeline. The pressure interface is used to connect to the pressure instrument to be tested.

10. A pressure calibration device according to claim 9, characterized in that, The pressure calibration device also includes a pre-pressure pump and a pressure relief valve; the pre-pressure pump is connected to the pressure pipeline and is used to provide pre-pressure to the pressure pipeline; one end of the pressure relief valve is connected to the pressure pipeline and the other end is connected to the atmosphere, and is used to relieve pressure on the pressure pipeline.

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