A pressure gauge calibration device

Abstract

The application discloses a pressure gauge calibration device, which comprises a base and a pressure regulating cylinder. A sliding seal is arranged in the pressure regulating cylinder, and a piston is matched with the sliding seal. A driving assembly is arranged on the pressure regulating cylinder. An installation part is arranged on the base, and a pressure relief valve is arranged on the installation part. A pressure increasing assembly, a pressure decreasing assembly and an adjusting assembly are arranged on the pressure regulating cylinder. In the pressure increasing state, the back-and-forth movement of the piston in the pressure regulating cylinder can compress the gas in the gas compression space and press the gas into the installation part to increase the internal pressure of the installation part, and at the same time, the external gas can be sucked into the gas expansion space. In the pressure decreasing state, the back-and-forth movement of the piston in the pressure regulating cylinder can suck the gas in the installation part into the gas expansion space to decrease the internal pressure of the installation part, and at the same time, the gas in the gas compression space can be discharged. The application aims at solving the technical problem of complicated operation of the existing equipment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of calibration equipment, in particular, relates to a pressure gauge calibration device. BACKGROUND

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

[0003] The existing pressure gauge calibration equipment 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 sealingly connected by sliding along the length direction of the pressure regulating cylinder, a first screw rod is arranged in the pressure regulating cylinder, one end of the first screw rod is rotationally connected with one side of the piston, the other end of the first screw rod extends out of the pressure regulating cylinder along the length direction of the pressure regulating cylinder, the first screw rod is connected with the pressure regulating cylinder through thread cooperation, two pressure output ports are respectively communicated with the end of the pressure regulating cylinder away from the first screw rod, the two pressure output ports are respectively used for installing a standard gauge and a gauge to be tested, a pressure stabilizing valve is arranged at the end of the pressure regulating cylinder away from the first screw rod, the pressure stabilizing valve is used for isolating 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 the end of the pressure regulating cylinder away from the first screw rod.

[0004] The above-mentioned pressure gauge calibration equipment has the following defects:

[0005] ① Before testing, the pressure stabilizing valve and the pressure relief valve need to be opened, so that the standard gauge and the gauge to be tested are reset to zero, and then the first screw rod is rotated to move the piston to the end of the pressure regulating cylinder (when measuring positive pressure, the piston moves to the end of the pressure regulating cylinder away from the pressure stabilizing valve, when measuring negative pressure, the piston moves to the end of the pressure regulating cylinder close to the pressure stabilizing valve), since the piston needs to be located at the end of the pressure regulating cylinder by rotating the first screw rod before each operation, the operation is relatively inconvenient.

[0006] ② When measuring negative pressure, after the piston moves to the end of the pressure regulating cylinder close to the pressure stabilizing valve, the pressure relief valve is closed, the first screw rod is rotated to make the piston slide in the pressure regulating cylinder 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 needs to continue negative pressure operation, the pressure stabilizing valve needs to be closed, the pressure relief valve needs to be opened, the first screw rod needs to be rotated to make the piston return to the end of the pressure regulating cylinder close to the pressure stabilizing valve, then the pressure relief valve needs to be closed again, the pressure stabilizing valve needs to be opened, the first screw rod needs to be rotated again to make the piston move away from the pressure stabilizing valve, and the negative pressure measurement needs to be continued, and the operation is repeated until the negative pressure reaches the end value of the gauge to be tested, so the operation increases the complexity of the calibration process and the workload of the workers. SUMMARY

[0007] In view of the deficiencies of the prior art, the purpose of the present application is to provide a pressure gauge calibration device to solve the technical problem of complicated testing operation of the existing equipment.

[0008] To achieve the aforementioned technical purposes, the technical scheme adopted by the present application comprises: a pressure gauge calibration device, comprising a base and a pressure regulating cylinder arranged on the base, a piston being arranged in sliding sealing cooperation in the pressure regulating cylinder, a driving assembly being arranged on the pressure regulating cylinder for driving the piston to slide back and forth in the pressure regulating cylinder, a gas compression space and a gas expansion space being formed in the pressure regulating cylinder when the piston moves in the pressure regulating cylinder, an installation portion being arranged on the base, the installation portion being a hollow structure and being used for installing a standard gauge and a gauge to be tested, a pressure relief valve being arranged on the installation portion;

[0009] The pressure regulating cylinder is provided with a pressurizing assembly, a depressurizing assembly and an adjusting assembly for switching between pressurizing and depressurizing states, through the adjusting assembly, the pressure regulating cylinder and the installation portion and the pressure regulating cylinder and the external space are both communicated through the pressurizing assembly to form a pressurizing state, in the pressurizing 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 installation portion to increase the internal pressure of the installation portion, and at the same time, external gas can be sucked into the gas expansion space;

[0010] Through the adjusting assembly, the pressure regulating cylinder and the installation portion and the pressure regulating cylinder and the external space are both communicated through the depressurizing assembly to form a depressurizing state, in the depressurizing state, the back and forth movement of the piston in the pressure regulating cylinder can suck the gas in the installation portion into the gas expansion space to reduce the internal pressure of the installation portion, and at the same time, the gas in the gas compression space can be discharged.

[0011] Compared with the prior art, the present application has the following advantages:

[0012] (1) The pressure gauge calibration device provided by the present application continuously drives the piston by means of the driving assembly, so that the piston performs reciprocating sliding movement in the pressure regulating cylinder. Based on this working principle, the installation portion can be continuously pressurized in theory, and the pressure in the installation portion is continuously increased. As a result, the gauge to be tested can adapt to a larger measurement range, and has stronger applicability.

[0013] (2) The pressure gauge calibration device provided by the present application can continuously pressurize by reciprocating the piston through the driving assembly, which is simpler than the prior art which only moves the piston in one direction to increase the internal pressure, and after the piston reaches the end, a series of cumbersome operations need to be performed, i.e. closing the pressure stabilizing valve, opening the pressure relief valve, moving the piston back to the end away from the pressure stabilizing valve, closing the pressure relief valve and moving the piston towards the pressure stabilizing valve again to continue pressurizing.

[0014] (3) The pressure gauge calibration device provided by the application can realize continuous pressure reduction of the installation part in theory by driving the piston to continuously reciprocate and slide in the pressure regulating cylinder.

[0015] (4) The pressure gauge calibration device provided by the application can realize pressure regulation by driving the piston to reciprocate in two directions through the driving assembly, which is different from the traditional device that relies on one-way piston movement to realize pressure regulation (i.e., the piston moves away from the pressure stabilizing valve to reduce the pressure, and when the piston moves to the limit position of the pressure regulating cylinder, the pressure stabilizing valve needs to be closed, the pressure relief valve needs to be opened, the piston needs to be reset in the opposite direction, and the pressure reduction process needs to be started again), which not only simplifies the operation process, but also improves the continuity of pressure regulation.

[0016] (5) The pressure gauge calibration device provided by the application breaks through the limitation that the traditional device needs to be pre-positioned before detection (when measuring positive pressure, the piston needs to be moved to the end of the pressure regulating cylinder away from the pressure stabilizing valve, and when measuring negative pressure, the piston needs to be moved to the end of the pressure regulating cylinder close to the pressure stabilizing valve). Since the piston can realize pressure regulation by reciprocating in two directions at any position in the pressure regulating cylinder, when the piston reaches the end of the pressure regulating cylinder, the piston only needs to be driven in the opposite direction to restore the pressure regulation ability, without the need for an additional reset step. This "position-independent" regulation mechanism significantly improves the operation convenience of the device.

[0017] 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 is respectively communicated with two ends of the pressure regulating cylinder, and the other end of the first pressurizing pipe and the second pressurizing pipe can be communicated with the installation part through the adjusting assembly. The first one-way valve and the second one-way valve are respectively arranged 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 installation part through the adjusting assembly. One end of the third pressurizing pipe and the fourth pressurizing pipe is respectively communicated with two ends of the pressure regulating cylinder, and the other end of the third pressurizing pipe and the fourth pressurizing pipe can be communicated with the outside through the adjusting assembly. The third one-way valve and the fourth one-way valve are respectively arranged 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 to the pressure regulating cylinder through the adjusting assembly.

[0018] The pressure reducing assembly comprises 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 is communicated with two ends of the pressure regulating cylinder respectively, the other end of the first pressure reducing pipe and the second pressure reducing pipe can be communicated with the mounting portion through the adjusting assembly, the fifth one-way valve and the sixth one-way valve are arranged on the first pressure reducing pipe and the second pressure reducing pipe respectively, the fifth one-way valve and the sixth one-way valve only allow gas to flow from the mounting portion to the pressure regulating cylinder through the adjusting assembly, one end of the third pressure reducing pipe and the fourth pressure reducing pipe is communicated with two ends of the pressure regulating cylinder respectively, the other end of the third pressure reducing pipe and the fourth pressure reducing pipe can be communicated with the outside through the adjusting assembly, the seventh one-way valve and the eighth one-way valve are arranged on the third pressure reducing pipe and the fourth pressure reducing pipe respectively, the seventh one-way valve and the eighth one-way valve only allow gas to be discharged from the pressure regulating cylinder to the outside through the adjusting assembly.

[0019] Further, the driving assembly comprises a first screw rod, the first screw rod is arranged on the pressure regulating cylinder along the axis of the pressure regulating cylinder, the first screw rod is rotationally connected with the pressure regulating cylinder, the first screw rod is sleeved outside the piston and is connected with the piston through thread cooperation;

[0020] Both sides of the piston are provided with sealing pipes, both the sealing pipes are sleeved outside the first screw rod, opposite ends of both the sealing pipes are fixedly connected with both sides of the piston respectively, opposite ends of both the sealing pipes extend to both ends of the pressure regulating cylinder respectively and extend out of the pressure regulating cylinder, sealing members are arranged between both ends of the pressure regulating cylinder and both the sealing pipes.

[0021] Further, the first screw rod is provided with a speed reduction assembly for slowing down the rotation speed of the first screw rod.

[0022] Further, the speed reduction assembly comprises a first gear coaxially fixedly connected with the screw rod, a second gear is rotationally connected on the base, the second gear is engaged with the first gear, and the diameter of the second gear is smaller than the diameter of the first gear, a fine adjustment knob is arranged on the second gear.

[0023] Further, the mounting portion is a tubular structure, a first through hole, a second through hole, a third through hole and a fourth through hole are sequentially arranged on the side wall of the mounting portion along the length direction thereof;

[0024] The adjusting assembly comprises a first pipe body fixed on the base, the first pipe body is located outside the mounting part, the first pipe body and the mounting part are in sliding sealing connection along the length direction of the mounting part, the first pressurizing pipe, the second pressurizing pipe, the first depressurizing pipe and the second depressurizing pipe are in communication with the first pipe body at one end away from the pressure regulating cylinder, in the pressurizing state, the first pressurizing pipe and the second pressurizing pipe are in communication with the inside of the mounting part through the second through hole and the fourth through hole respectively, in the depressurizing state, the first depressurizing pipe and the second depressurizing pipe are in communication with the inside of the mounting part through the first through hole and the third through hole respectively, a strip-shaped through hole is formed on the first pipe body along the length direction of the first pipe body, the to-be-inspected meter, the standard meter and the pressure relief valve are in communication with the inside of the mounting part through the strip-shaped through hole;

[0025] The adjusting assembly further comprises a second pipe body and a third pipe body, the second pipe body is fixed on the base, the second pipe body is located outside the third pipe body, the second pipe body and the third pipe body are in sliding sealing connection along the length direction of the third pipe body, the fifth through hole, the sixth through hole, the seventh through hole and the eighth through hole are sequentially formed on the side wall of the third pipe body along the length direction of the third pipe body, the fifth through hole, the sixth through hole, the seventh through hole and the eighth through hole correspond to the first through hole, the second through hole, the third through hole and the fourth through hole respectively, the third pressurizing pipe, the fourth pressurizing pipe, the third depressurizing pipe and the fourth depressurizing pipe are in communication with the second pipe body at one end away from the pressure regulating cylinder, in the pressurizing state, the third pressurizing pipe and the fourth pressurizing pipe are in communication with the inside of the third pipe body through the sixth through hole and the eighth through hole respectively, in the depressurizing state, the third depressurizing pipe and the fourth depressurizing pipe are in communication with the inside of the third pipe body through the fifth through hole and the seventh through hole respectively, the third pipe body is provided with a vent hole in communication with the outside at all times;

[0026] The adjusting assembly further comprises a second screw rod, a cross rod and two connecting rods, one end of each of the two connecting rods is connected with the mounting part and the third pipe body respectively, the other end of each of the two connecting rods extends out of the first pipe body and the second pipe body along the length direction of the mounting part and is fixedly connected with the two ends of the cross rod respectively, the second screw rod is arranged on the cross rod and is connected with the cross rod through thread cooperation, and the second screw rod is rotationally connected with the base. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0028] Figure 1 It is a structural schematic diagram of the device in the pressurizing state;

[0029] Figure 2 It is Figure 1a sectional structure schematic view of the device;

[0030] Figure 3 a structural schematic view of the device in a decompression state;

[0031] Figure 4 a structural schematic view of the device in a decompression state; Figure 3 a sectional structure schematic view of the device.

[0032] Reference signs:

[0033] Base 1, pressure regulating cylinder 2, piston 3, mounting portion 4, standard meter 5, meter to be tested 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 decompression pipe 16, second decompression pipe 17, third decompression pipe 18, fourth decompression pipe 19, fifth one-way valve 20, sixth one-way valve 21, seventh one-way valve 22, eighth one-way valve 23, first lead screw 24, sealing pipe 25, sealing member 26, first gear 27, second gear 28, fine adjustment knob 29, first pipe body 30, limiting rod 31, second pipe body 32, third pipe body 33, second lead screw 34, cross rod 35, connecting rod 36. DETAILED DESCRIPTION

[0034] In view of the deficiencies in the prior art, the present inventors have long studied and practiced to come up with the technical solution of the present application. The technical solution, its implementation process and principles will be further explained below in combination with the drawings and specific implementation cases in the embodiments of the present application.

[0035] It should be noted that the embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. The described embodiments are only a part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, the present application covers any alternative, modification, equivalent method and solution defined by the claims, and all other embodiments obtained by those skilled in the art without creative labor, which belong to the scope of protection of the present application.

[0036] In the description of the present application, "first", "second", "third" and similar words do not represent any order, number or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not represent a number limit, but represent the existence of at least one. "Include" or "contain" and similar words mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect.

[0037] In the description of the present application, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, when using two sides, outer side, up and down and other positional terms, it should be understood that they are only used for easy understanding and description, considering that the structure can be oriented to other positions.

[0038] In the description of the present application, unless otherwise explicitly specified and limited, the technical terms or scientific terms used should be understood as the usual meaning understood by those skilled in the art to which the present application belongs, and the terms "mounting", "connection", "connection" and the like should be broadly understood, for example, it can be fixed connection, it can also be detachable connection, it can also be in contact connection or integral connection; For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] Please refer to Figures 1-4 The present application provides a technical solution: a pressure gauge calibration device, as shown in Figure 1 , comprising a base 1 and a pressure regulating cylinder 2, the pressure regulating cylinder 2 is fixed on the base 1 along the horizontal direction, as shown in Figure 2 , the inside of the pressure regulating cylinder 2 is configured with a sliding sealing piston 3, the pressure regulating cylinder 2 is provided with a driving assembly for driving the piston 3 to slide back and forth inside the pressure regulating cylinder 2, when the piston 3 moves inside the pressure regulating cylinder 2, a gas compression space and a gas expansion space are formed in the pressure regulating cylinder 2. 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 forms a gas compression space, and the space on the right side of the piston 3 constitutes a gas expansion space; on the contrary, when the piston 3 moves to the right, the space on the right side of the piston 3 in the pressure regulating cylinder 2 becomes a gas compression space, and the space on the left side of the piston 3 becomes a gas expansion space.

[0040] like Figure 1 As shown, a mounting section 4 is provided on the base 1. The mounting section 4 is a hollow structure used to mount the standard gauge 5 and the gauge 6 to be tested. The standard gauge 5 and the gauge 6 to be tested are connected to the mounting section 4 in parallel, and both are under the same pressure. During the calibration process, by comparing the difference in their readings, it can be determined whether the measurement error of the gauge 6 to be tested is within the allowable range. If the reading error of the gauge 6 to be tested exceeds the preset threshold, the pointer of the gauge 6 to be tested can be manually adjusted to align its reading with that of the standard gauge 5, thereby completing the calibration.

[0041] like Figure 2 As shown, the pressure regulating cylinder 2 is equipped with a pressurizing component, a depressurizing component, and an adjusting component. The adjusting component, as the core control unit, can switch between pressurizing / depressurizing modes and correspondingly change the pressure path. When the adjusting component switches the device to pressurizing mode, 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 one hand, the gas compression space inside the pressure regulating cylinder 2 (i.e., the sealed cavity on the front side of the piston 3's movement direction) is connected to the inner cavity of the mounting part 4. When the piston 3 is pushed forward by the driving component, the gas in the gas compression space is forced into the mounting part 4, driving the pressure in the chambers containing the gauge under test 6 and the standard gauge 5 to rise. Simultaneously, the gas expansion space (the cavity on the rear side of the piston 3's movement direction) is connected to the external atmospheric environment. When the piston 3 moves backward, a negative pressure is formed, and external air is drawn into the gas expansion space, achieving gas replenishment.

[0042] Specifically, when piston 3 moves to the left, the space to the left of piston 3 inside pressure regulating cylinder 2 is compressed, forming a gas compression space. The pressure inside this space increases, forcing the gas in the gas compression space into mounting part 4, thus increasing the gas pressure inside mounting part 4. Simultaneously, the space to the right of piston 3 inside pressure regulating cylinder 2 expands, forming a gas expansion space, and its internal pressure decreases. At this time, external gas can be drawn into the gas expansion space inside pressure regulating cylinder 2 through the adjusting assembly. It should be noted that during this process, the gas flow direction is unidirectional and definite; that is, the gas in the gas compression space can only flow into mounting part 4, and external gas can only flow into the gas expansion space.

[0043] Similarly, when piston 3 moves to the right, the space to the right of piston 3 in pressure regulating cylinder 2 is compressed, forming a new gas compression space (as the direction of piston 3 changes, the position of the gas compression space relative to piston 3 also changes), and its internal pressure increases, thereby forcing the gas in the gas compression space into the mounting part 4, further increasing the gas pressure in the mounting part 4. At the same time, the space to the left of piston 3 in pressure regulating cylinder 2 is expanded, forming a new gas expansion space (similarly, as the direction of piston 3 changes, the position of the gas expansion space relative to piston 3 also changes), and its internal pressure decreases. At this time, external gas can be drawn into the gas expansion space in pressure regulating cylinder 2 by adjusting the assembly. Similarly, the gas flow direction remains unidirectional and definite, that is, the gas in the gas compression space can only flow into the mounting part 4, and the external gas can only flow into the gas expansion space. In this way, it can be ensured that the gas in the mounting part 4 will not overflow, thereby maintaining its internal pressure stability.

[0044] The piston 3 is continuously driven by a drive assembly, causing it to reciprocate within the pressure regulating cylinder 2. Based on this working principle, it is theoretically possible to continuously pressurize the mounting section 4, thereby causing the pressure within the mounting section 4 to continuously increase. Thanks to this, the gauge 6 can accommodate a larger measurement range, thus possessing greater applicability.

[0045] Compared to existing equipment that can only increase internal pressure by moving the piston in one direction, and requires a series of cumbersome 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 again, and moving the piston back towards the pressure regulating valve to continue pressurizing—this solution can achieve continuous pressurization by driving the piston 3 to reciprocate through the drive assembly, significantly simplifying the operation process.

[0046] like Figure 4 As shown, by adjusting the assembly, the pressure regulating cylinder 2 and the mounting part 4 are connected by the pressure reducing assembly to form a pressure reducing state. In the pressure reducing state, the piston 3 moves back and forth in the pressure regulating cylinder 2 to draw the gas in the mounting part 4 into the gas expansion space to reduce the internal pressure of the mounting part 4, and at the same time, it can discharge the gas in the gas compression space.

[0047] Specifically, when the piston 3 moves to the left, the space on the right side of the piston 3 in the pressure regulating cylinder 2 expands to form a gas expansion space. At this time, the internal pressure of the space decreases, and the gas in the mounting part 4 is directed to be sucked into the gas expansion space under the action of the adjusting assembly, so that the gas pressure in the mounting part 4 decreases correspondingly. At the same time, the space on the left side of the piston 3 in the pressure regulating cylinder 2 is compressed due to the movement of the piston 3 to form a gas compression space, and the internal pressure of the gas compression space increases to drive the gas in the gas compression space to be directed to be discharged to the outside. It needs to be particularly emphasized that during the movement of the piston 3 to the left, the gas flow direction has strict unidirectionality, that is, the gas in the mounting part 4 only flows to the gas expansion space, the gas in the gas compression space only flows to the outside, and the external gas cannot flow into the mounting part 4.

[0048] 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. Under the guidance of the adjusting assembly, the gas in the mounting part 4 is again directed to be sucked into the gas expansion space, so that the pressure in the mounting part 4 further decreases. 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 of the gas compression space increases to drive the gas in the gas compression space to be directed to be discharged. During this process, the unidirectionality of the gas flow direction is still strictly maintained: the gas in the mounting part 4 only unidirectionally flows into the gas expansion space, the gas in the gas compression space only unidirectionally flows to the outside, and the external gas cannot enter the mounting part 4, thereby effectively ensuring the stability of the internal pressure environment of the mounting part 4.

[0049] Through the continuous reciprocating driving of the piston 3 by the driving assembly, the piston 3 periodically slides in the pressure regulating cylinder 2, which can theoretically realize continuous decompression of the mounting part 4. During this process, the pressure in the mounting part 4 will decrease with the continuous movement of the piston 3, thereby widening the measurement range of the pressure gauge to be tested and enhancing the adaptability of the equipment to the calibration of pressure gauges of different ranges.

[0050] In addition, compared with the traditional equipment which relies on the unidirectional movement of the piston to realize pressure regulation (that is, the piston moves away from the pressure stabilizing valve to reduce the pressure, and when the piston moves to the limit position of the pressure regulating cylinder, a complex operation of closing the pressure stabilizing valve, opening the pressure relief valve, reversing the piston and starting the decompression process again is required), the present application can maintain the pressure decrease through the bidirectional reciprocating movement of the piston driven by the driving assembly, which not only simplifies the operation process, but also improves the continuity of pressure regulation.

[0051] In addition, the conventional device needs to preset the piston before the test (when measuring the positive pressure, the piston needs to be moved to the far end of the pressure regulating cylinder away from the pressure stabilizing valve, and when measuring the negative pressure, the piston needs to be moved to the end close to the pressure stabilizing valve), and the technical scheme of the present application breaks through this limitation. Since the piston 3 can realize pressure regulation through bidirectional movement at any position in the pressure regulating cylinder 2, when the piston 3 reaches the end of the pressure regulating cylinder 2, it only needs to drive the piston 3 in the opposite direction to restore the pressure regulation ability, without the need for an additional reset step. This "position-independent" regulation mechanism significantly improves the operation convenience of the device.

[0052] As shown in Figure 2 In the present embodiment, the pressurizing assembly includes a first pressurizing pipe 8, a second pressurizing pipe 9, a third pressurizing pipe 10, and a fourth pressurizing pipe 11. One end of the first pressurizing pipe 8 and the second pressurizing pipe 9 respectively communicates with the two ends of the pressure regulating cylinder 2, and the first pressurizing pipe 8 is located at the left end of the pressure regulating cylinder 2, and the second pressurizing pipe 9 is located at the right end of the pressure regulating cylinder 2. The other end of the first pressurizing pipe 8 and the second pressurizing pipe 9 can communicate with the mounting part 4 through the adjusting assembly, and the first pressurizing pipe 8 and the second pressurizing pipe 9 are respectively provided with a first one-way valve 12 and a second one-way valve 13, which only allow gas to flow from the pressure regulating cylinder 2 to the mounting part 4 through the adjusting assembly. One end of the third pressurizing pipe 10 and the fourth pressurizing pipe 11 respectively communicates with the two ends of the pressure regulating cylinder 2, and the third pressurizing pipe 10 is located at the left end of the pressure regulating cylinder 2, and the fourth pressurizing pipe 11 is located at the right end of the pressure regulating cylinder 2. The other end of the third pressurizing pipe 10 and the fourth pressurizing pipe 11 can communicate with the outside through the adjusting assembly, and the third pressurizing pipe 10 and the fourth pressurizing pipe 11 are respectively provided with a third one-way valve 14 and a fourth one-way valve 15, which only allow gas to flow from the outside into the pressure regulating cylinder 2 through the adjusting assembly.

[0053] When the driving assembly drives the piston 3 to move to the left, the gas in the left space of the piston 3 is pressed into the mounting part 4 through the first one-way valve 12, and at the same time, the external gas enters the right space of the piston 3 through the fourth one-way valve 15 to supplement the gas; when the piston 3 moves to the right, the gas in the right space of the piston 3 is pressed into the mounting part 4 through the second one-way valve 13, and at the same time, the external gas enters the left space of the piston 3 through the third one-way valve 14 to supplement the gas, and such a cycle can realize continuous pressurization of the gas.

[0054] As shown in Figure 4As 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 respectively connected to both ends of the pressure regulating cylinder 2. 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 pressure reducing pipe 16 and the second pressure reducing pipe 17 can be connected to the mounting part 4 through the adjusting assembly. A fifth one-way valve 20 and a sixth one-way valve 21 are respectively provided on the first pressure reducing pipe 16 and the second pressure reducing pipe 17. The fifth one-way valve 20 and the sixth one-way valve 21 only allow gas to flow from the mounting part 4 through the adjusting assembly to the pressure regulating cylinder 2. One end of the third pressure reducing pipe 18 and the fourth pressure reducing pipe 19 are respectively connected to both ends of the pressure regulating cylinder 2. 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 adjustment component. The third pressure reducing pipe 18 and the fourth pressure reducing pipe 19 are respectively equipped 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 adjustment component.

[0055] When the drive 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 drawn 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 drawn 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.

[0056] like Figure 2 As shown, in this embodiment, the driving component includes a first lead screw 24, which is disposed along the axis of the pressure regulating cylinder 2 and is rotatably connected to the pressure regulating cylinder 2. The first lead screw 24 is sleeved on the piston 3 and is connected to the piston 3 by a threaded engagement. Rotating the first lead screw 24 can cause the piston 3 to move back and forth inside the pressure regulating cylinder 2.

[0057] The piston 3 is provided with a sealing tube 25 on both sides, both sealing tubes 25 are sleeved on the first screw rod 24, and the opposite ends of the two sealing tubes 25 are fixedly connected with the two sides of the piston 3 respectively. The opposite ends of the two sealing tubes 25 extend to the two ends of the pressure regulating cylinder 2 respectively and extend out of the pressure regulating cylinder 2. The sealing tube 25 can move along the length direction of the pressure regulating cylinder 2 with the piston 3. The sealing pieces 26 are arranged between the two sealing tubes 25 and the two ends of the pressure regulating cylinder 2. Specifically, the end of the pressure regulating cylinder 2 is provided with an opening penetrating along the length direction thereof, the sealing piece 26 is a sealing ring, and the sealing ring is embedded in the opening. The sealing tube 25 passes through the opening, and the outer side wall of the sealing tube 25 abuts against the inner side of the sealing piece 26. During the movement of the sealing tube 25 with the piston 3, the sealing piece 26 always abuts against the sealing tube 25. Through the sealing piece 26 and the sealing tube 25, the gas in the space on both sides of the piston 3 in the pressure regulating cylinder 2 is not easy to exchange with the outside through the gap between the piston 3 and the first screw rod 24, and the sealing performance is improved.

[0058] Further, the pressure regulating cylinder 2 is provided with a limiting rod 31 fixedly connected along the length direction thereof, and the limiting rod 31 penetrates the piston 3 and is in sliding sealing cooperation with the piston 3.

[0059] As shown in Figure 1 , in the embodiment, the first screw rod 24 is provided with a speed reduction assembly for slowing down the rotation speed of the first screw rod 24. Through the speed reduction assembly, the rotation speed of the first screw rod 24 can be slowed down relatively, so as to realize the fine adjustment of the gas pressure and better control the gas pressure to reach the calibration point of the to-be-tested meter 6.

[0060] Further, the speed reduction assembly comprises a first gear 27 coaxially fixedly connected on the first screw rod 24, and a second gear 28 rotationally connected on the base 1. The second gear 28 is in meshing cooperation with the first gear 27, and the diameter of the second gear 28 is smaller than that of the first gear 27. Since the diameter of the second gear 28 is smaller than that 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 with 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, so as to realize the purpose of speed reduction. The second gear 28 is provided with a fine adjustment knob 29, and the second gear 28 can be driven to rotate synchronously by rotating the fine adjustment knob 29.

[0061] As shown in Figure 2 and 4 , in the embodiment, the mounting portion 4 has 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 the length direction thereof.

[0062] The adjusting assembly comprises a first tube body 30 fixed on the base 1, the first tube body 30 is located outside the mounting portion 4, the first tube body 30 is in sliding sealing connection with the mounting portion 4 along the length direction of the mounting portion 4, the first pressurizing pipe 8, the second pressurizing pipe 9, the first depressurizing pipe 16 and the second depressurizing pipe 17 are communicated with the first tube body 30 away from one end of the pressure regulating cylinder 2, in the pressurized state, the first pressurizing pipe 8 and the second pressurizing pipe 9 are communicated with the inside of the mounting portion 4 through the second through hole and the fourth through hole respectively, in the depressurized state, the first depressurizing pipe 16 and the second depressurizing pipe 17 are communicated with the inside of the mounting portion 4 through the first through hole and the third through hole respectively, a strip-shaped through hole is formed on the first tube body 30 along the length direction thereof, the meter to be tested 6, the standard meter 5 and the pressure relief valve 7 are communicated with the inside of the mounting portion 4 through the strip-shaped through hole;

[0063] The adjusting assembly further comprises a second tube body 32 and a third tube body 33, the second tube body 32 is fixed on the base 1, the second tube body 32 is located outside the third tube body 33, the second tube body 32 is in sliding sealing connection with the third tube body 33 along the length direction of the third tube body 33, a fifth through hole, a sixth through hole, a seventh through hole and an eighth through hole are sequentially formed on the side wall of the third tube body 33 along the length direction thereof, the fifth through hole, the sixth through hole, the seventh through hole and the eighth through hole correspond to the first through hole, the second through hole, the third through hole and the fourth through hole respectively, the third pressurizing pipe 10, the fourth pressurizing pipe 11, the third depressurizing pipe 18 and the fourth depressurizing pipe 19 are communicated with the second tube body 32 away from one end of the pressure regulating cylinder 2, in the pressurized state, the third pressurizing pipe 10 and the fourth pressurizing pipe 11 are communicated with the inside of the third tube body 33 through the sixth through hole and the eighth through hole respectively, in the depressurized state, the third depressurizing pipe 18 and the fourth depressurizing pipe 19 are communicated with the inside of the third tube body 33 through the fifth through hole and the seventh through hole respectively, a vent hole is formed on the third tube body 33, the vent hole is always communicated with the outside.

[0064] The adjusting assembly further comprises a second screw rod 34, a cross rod 35 and two connecting rods 36, one end of each of the two connecting rods 36 is connected with the mounting portion 4 and the third tube body 33 respectively, the other end of each of the two connecting rods 36 extends through the first tube body 30 and the second tube body 32 along the length direction of the mounting portion 4 respectively, and is fixedly connected with both ends of the cross rod 35 respectively, the second screw rod 34 is arranged on the cross rod 35 and is connected with the cross rod 35 through thread cooperation, and the second screw rod 34 is rotationally connected with the base 1.

[0065] The mounting portion 4 and the third pipe body 33 are synchronously moved by rotating the screw rod. When the first pressurizing pipe 8 and the second pressurizing pipe 9 are respectively communicated with the inside of the mounting portion 4 through the second through hole and the fourth through hole, and the third pressurizing pipe 10 and the fourth pressurizing pipe 11 are respectively communicated with the inside of the third pipe body 33 through the sixth through hole and the eighth through hole, the pressurizing state is formed. When the first decompressing pipe 16 and the second decompressing pipe 17 are respectively communicated with the inside of the mounting portion 4 through the first through hole and the third through hole, and the third decompressing pipe 18 and the fourth decompressing pipe 19 are respectively communicated with the inside of the third pipe body 33 through the fifth through hole and the seventh through hole, the decompressing state is formed. The above-mentioned setting is convenient to realize the switching between the pressurizing state and the decompressing state.

[0066] It should be understood that the above-mentioned embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary skilled in the art to which the present application belongs, without departing from the concept of the present application, some simple deductions or substitutions can also be made, and any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A pressure gauge calibration device comprising a base and a pressure regulating cylinder disposed on the base, the pressure regulating cylinder having a piston disposed therein in sliding sealing engagement, characterised in that: The drive assembly is arranged on the pressure regulating cylinder for driving the piston to slide back and forth in the pressure regulating cylinder, and the piston forms a gas compression space and a gas expansion space in the pressure regulating cylinder when moving in the pressure regulating cylinder; the base is provided with a mounting portion which is a hollow structure and is used for mounting a standard meter and a meter to be tested; and the mounting portion is provided with a pressure relief valve; The pressure regulating cylinder is provided with a pressurizing assembly, a depressurizing assembly and an adjusting assembly for switching between the pressurizing state and the depressurizing state; through the adjusting assembly, the pressure regulating cylinder and the mounting portion are communicated through the pressurizing assembly to form the pressurizing state, and in the pressurizing 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 of the mounting portion, and can also suck the external gas into the gas expansion space; Through the adjusting assembly, the pressure regulating cylinder and the mounting portion are communicated through the depressurizing assembly to form the depressurizing state, and in the depressurizing state, the back and forth movement of the piston in the pressure regulating cylinder can suck the gas in the mounting portion into the gas expansion space to reduce the internal pressure of the mounting portion, and can also discharge the gas in the gas compression space; The pressurizing assembly comprises 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 is communicated with 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 communicated with the mounting portion through the adjusting 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 the gas to flow from the pressure regulating cylinder to the mounting portion through the adjusting assembly; one end of the third pressurizing pipe and the fourth pressurizing pipe is communicated with the two ends of the pressure regulating cylinder respectively, and the other end of the third pressurizing pipe and the fourth pressurizing pipe can be communicated with the outside through the adjusting 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 the gas to flow from the outside into the pressure regulating cylinder through the adjusting assembly; The depressurizing assembly comprises a first depressurizing pipe, a second depressurizing pipe, a third depressurizing pipe and a fourth depressurizing pipe; one end of the first depressurizing pipe and the second depressurizing pipe is communicated with the two ends of the pressure regulating cylinder respectively, and the other end of the first depressurizing pipe and the second depressurizing pipe can be communicated with the mounting portion through the adjusting assembly; the first depressurizing pipe and the second depressurizing pipe are respectively provided with a fifth one-way valve and a sixth one-way valve; the fifth one-way valve and the sixth one-way valve only allow the gas to flow from the mounting portion to the pressure regulating cylinder through the adjusting assembly; one end of the third depressurizing pipe and the fourth depressurizing pipe is communicated with the two ends of the pressure regulating cylinder respectively, and the other end of the third depressurizing pipe and the fourth depressurizing pipe can be communicated with the outside through the adjusting assembly; the third depressurizing pipe and the fourth depressurizing pipe are respectively provided with a seventh one-way valve and an eighth one-way valve; the seventh one-way valve and the eighth one-way valve only allow the gas to be discharged from the pressure regulating cylinder to the outside through the adjusting assembly.

2. A pressure gauge calibration device according to claim 1, characterised in that: The driving assembly comprises a first screw rod, which is arranged on the pressure regulating cylinder along the pressure regulating cylinder axis, and is rotationally connected with the pressure regulating cylinder, and is sleeved outside the piston and is connected with the piston through thread cooperation; Both sides of the piston are provided with sealing tubes, both of which are sleeved outside the first screw rod, and one end of each of the two sealing tubes is fixedly connected with the two sides of the piston, and the other end of each of the two sealing tubes extends to the two ends of the pressure regulating cylinder and extends out of the pressure regulating cylinder, and sealing elements are arranged between the two ends of the pressure regulating cylinder and the two sealing tubes.

3. A pressure gauge calibration device as claimed in claim 2, characterised in that: A speed reduction assembly is arranged on the first screw rod to slow down the rotation speed of the first screw rod.

4. A pressure gauge calibration device as claimed in claim 3, characterised in that: The speed reduction assembly comprises a first gear coaxially fixedly connected with the screw rod, a second gear rotationally connected with the base, the second gear being engaged with the first gear and having a smaller diameter than the first gear, and a fine adjustment knob arranged on the second gear.

5. A pressure gauge calibration device as claimed in claim 4, characterised 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 the length direction thereof; The adjusting assembly comprises a first pipe body fixed on the base, the first pipe body being located outside the mounting portion and being in sliding and sealing connection with the mounting portion along the length direction of the mounting portion, and the first pressurizing pipe, the second pressurizing pipe, the first depressurizing pipe and the second depressurizing pipe being in communication with the first pipe body at the end away from the pressure regulating cylinder, and in the pressurized state, the first pressurizing pipe and the second pressurizing pipe being in communication with the inside of the mounting portion through the second through hole and the fourth through hole respectively, and in the depressurized state, the first depressurizing pipe and the second depressurizing pipe being in communication with the inside of the mounting portion through the first through hole and the third through hole respectively, and a strip-shaped through hole being formed on the first pipe body along the length direction thereof, and the test meter, the standard meter and the pressure relief valve being in communication with the inside of the mounting portion through the strip-shaped through hole; The adjusting assembly further comprises a second pipe body and a third pipe body, the second pipe body being fixed on the base and being located outside the third pipe body, and the second pipe body being in sliding and sealing connection with the third pipe body along the length direction of the third pipe body, and the side wall of the third pipe body being sequentially provided with a fifth through hole, a sixth through hole, a seventh through hole and an eighth through hole along the length direction thereof, the fifth through hole, the sixth through hole, the seventh through hole and the eighth through hole corresponding to the first through hole, the second through hole, the third through hole and the fourth through hole respectively, and the third pressurizing pipe, the fourth pressurizing pipe, the third depressurizing pipe and the fourth depressurizing pipe being in communication with the second pipe body at the end away from the pressure regulating cylinder, and in the pressurized state, the third pressurizing pipe and the fourth pressurizing pipe being in communication with the inside of the third pipe body through the sixth through hole and the eighth through hole respectively, and in the depressurized state, the third depressurizing pipe and the fourth depressurizing pipe being in communication with the inside of the third pipe body through the fifth through hole and the seventh through hole respectively, and an air vent being formed on the third pipe body and being in communication with the outside at all times. The adjusting assembly further comprises a second screw rod, a cross rod and two connecting rods, one end of each of the two connecting rods is connected with the mounting part and the third pipe body respectively, the other end of each of the two connecting rods extends through the first pipe body and the second pipe body along the length direction of the mounting part respectively, and is fixedly connected with the two ends of the cross rod respectively, the second screw rod is arranged on the cross rod and is connected with the cross rod through thread cooperation, and the second screw rod is rotationally connected with the base.

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