Positive and negative pressure integrated gas piston type pressure gauge

Abstract

The invention discloses a positive and negative pressure integrated gas piston type pressure gauge which comprises a positive pressure valve, the inlet end of the positive pressure valve is connected with a positive pressure gas pipe, the outlet end of the positive pressure valve is connected with a four-way connector through a pipeline, the four-way connector is connected with a gauge stand valve a, a gauge stand valve b, a pressure regulator and a pressure gauge through pipelines, and the pressure regulator is connected with a filter through a pipeline. The filter is respectively connected with a three-way joint and a pressure release valve through pipelines, two output ends of the three-way joint are respectively connected with a negative pressure piston valve and a positive pressure piston valve through pipelines, output ends of the negative pressure piston valve and the positive pressure piston valve are respectively connected with a piston system through pipelines, and a positive pressure weight and a negative pressure weight are arranged on the piston system. The inlet end of the negative-pressure valve is connected with a negative-pressure air pipe, and the outlet end of the negative-pressure valve is connected with the pressure regulator through a pipeline. According to the positive and negative pressure integrated gas piston type pressure gauge, the problems that the measuring range of an existing piston is small, and calibration is inconvenient to achieve quickly and effectively are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure-generating equipment, and in particular relates to a positive-negative pressure integrated gas piston pressure gauge. Background Art

[0002] Pressure measurement is developing towards high precision, and ensuring the accuracy and long-term stability of high-precision gas force measurement is related to the safe and stable operation of several industries and fields that are important to the national economy and people's livelihood. Therefore, the development and industrialization of high-precision piston pressure measurement instruments is a key node link to improve the level of pressure measurement technology and equipment, ensure the safe and healthy development of my country's economic and social operations, and is one of the major national needs.

[0003] At present, vacuum measurement equipment is generally complicated to operate, has a large measuring range, and is not easy to maintain. Positive and negative pressure switching requires the opening and closing of the reversing valve, and the plugging and unplugging of the positive and negative pressure pipes. The long-term opening of the reversing valve can easily cause the reversing valve to fail, resulting in system paralysis; the starting range is generally set to (-100~-10) kPa, (-100~-5) kPa, which makes it impossible to accurately measure the pressure of some high-precision and micro-pressure ranges; the pressure gauge design is too complicated and not easy to maintain, and it is difficult to troubleshoot when a fault occurs. The pressure control accuracy is low. Usually, the pressure regulator is rotated 2-3 times before the pressure is transmitted to the piston system, and it takes 1-2 minutes to stabilize the pressure at one point. Summary of the invention

[0004] The purpose of the present invention is to provide a positive and negative pressure integrated gas piston pressure gauge, which solves the problem that the existing piston has a small measuring range and is not convenient for rapid and effective calibration.

[0005] The technical solution adopted by the present invention is a positive and negative pressure integrated gas piston pressure gauge, including a positive pressure valve, the inlet end of the positive pressure valve is connected to a positive pressure air pipe, the outlet end of the positive pressure valve is connected to a four-way joint through a pipeline, the four-way joint is respectively connected to a gauge seat valve a, a gauge seat valve b, a pressure regulator and a pressure gauge through pipelines, the pressure regulator is connected to a filter through a pipeline, the filter is respectively connected to a three-way joint and a pressure relief valve through pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve and a positive pressure piston valve through pipelines, the output ends of the negative pressure piston valve and the positive pressure piston valve are respectively connected to a piston system through pipelines, the piston system is provided with positive pressure weights and negative pressure weights, and also includes a negative pressure valve, the inlet end of the negative pressure valve is connected to a negative pressure air pipe, and the outlet end of the negative pressure valve is connected to the pressure regulator through a pipeline.

[0006] The present invention is also characterized in that: It also includes a bottom shell, on which a piston system, a negative pressure piston valve, a positive pressure piston valve, a filter, a gauge seat valve a, a gauge seat valve b, a pressure regulator, a pressure relief valve, a pressure gauge and a positive pressure valve are all arranged.

[0007] The other end of the meter seat valve a is connected to the meter a to be inspected through a pipeline, and the other end of the meter seat valve b is connected to the meter b to be inspected through a pipeline.

[0008] A vacuum pump is provided on the negative pressure air pipe.

[0009] The piston system includes a cantilever, with a cantilever through hole in the middle of the cantilever, a shell, a negative pressure sealing cylinder and a positive pressure sealing cylinder, the bottom of the shell is arranged in the cantilever through hole, the outer wall of the top of the shell is sleeved with a pressure cover, the shell and the pressure cover are both hollow structures, a piston assembly is arranged in the shell and the pressure cover, the top of the piston assembly is fixedly connected to a piston end cover, the top of the piston end cover is fixedly connected to a positive pressure piston tray, the positive pressure weight is arranged on the positive pressure piston tray, the outer wall of the bottom of the positive pressure piston tray is sleeved with a bearing, the bearing is fixedly connected to the inner wall of the pressure cover through a bearing pressure ring, the bottom of the piston assembly is fixedly connected to a negative pressure connecting rod through a connecting sleeve, the other end of the negative pressure connecting rod is fixedly connected to a negative pressure base, the negative pressure weight is arranged on the negative pressure base, and also includes a negative pressure chamber channel and a positive pressure chamber channel, one end of the negative pressure chamber channel is connected to the negative pressure piston valve through a pipeline, and the other end of the negative pressure chamber channel leads to the negative pressure chamber, one end of the positive pressure chamber channel is connected to the positive pressure piston valve through a pipeline, and the other end of the positive pressure chamber channel leads to the positive pressure chamber. The negative pressure sealing cylinder is fixedly connected to the top of the outer shell, the pressure cover and the positive pressure piston tray are both arranged in the negative pressure sealing cylinder, the positive pressure sealing cylinder is fixedly connected to the bottom of the outer shell, and the negative pressure connecting rod and the negative pressure bottom plate are both arranged in the positive pressure sealing cylinder; the piston assembly includes a piston cylinder, the outer wall of the piston cylinder is in contact with the inner wall of the outer shell, a piston rod is arranged in the piston cylinder, the piston end cover is fixedly connected to the top of the piston rod, and the piston rod is fixedly connected to the negative pressure connecting rod through a connecting sleeve; the connecting sleeve is fixedly connected to the outer wall of the bottom of the piston rod, the inner wall of the bottom of the connecting sleeve is in contact with the outer wall of the negative pressure connecting rod, and the outer wall of the bottom of the connecting sleeve is fixedly connected with a negative pressure piston rod locking nut The negative pressure piston rod locking nut is sleeved on the outer wall of the negative pressure connecting rod; a sealing groove is axially opened on the top of the outer shell, and an O-ring a is arranged in the sealing groove; an O-ring b is arranged between the top of the outer shell and the piston cylinder; a two-step step through hole with a first step and a second step is opened on the cantilever, and an O-ring c is arranged on the inner wall of the cantilever at the first step and the second step; an O-ring d is sleeved on the outer wall of the bottom of the outer shell, and the O-ring d is arranged between the outer shell and the cantilever; the negative pressure chamber channel passes through the cantilever, the outer shell and the pressure cover to enter the negative pressure chamber, and the positive pressure chamber channel passes through the cantilever and the outer shell to enter the positive pressure chamber.

[0010] The voltage regulator includes a voltage regulator lead screw, one end of which is sleeved with a voltage regulator rotating shaft on the outer wall, and the other end of which is sleeved with a voltage regulator slotted barrel on the outer wall, and the end of the voltage regulator rotating shaft close to the voltage regulator slotted barrel is sleeved with a deep groove ball bearing a and a deep groove ball bearing b on the outer wall, and the outer walls of the deep groove ball bearing a and the deep groove ball bearing b are in contact with the inner wall of the end of the voltage regulator slotted barrel close to the voltage regulator rotating shaft, and the end of the voltage regulator slotted barrel close to the voltage regulator rotating shaft is clamped with a voltage regulator fixing ring, and the end of the voltage regulator lead screw away from the voltage regulator rotating shaft is fixedly connected with a micro-pressure Pump piston, the outer wall of the micro-pressure pump piston is provided with a micro-pressure pump cylinder, the pressure regulator slotted barrel is connected to the micro-pressure pump cylinder by a connecting sleeve, the end of the micro-pressure pump cylinder away from the pressure regulator screw is provided with a pressure regulator back cover, the pressure regulator back cover is respectively connected to the filter, the negative pressure valve, the pressure relief valve and the four-way joint through four pipes, a slide groove is horizontally opened on the pressure regulator slotted barrel along the axial direction, a pressure regulator screw step groove is vertically opened on the pressure regulator screw, a pressure regulator limit slip ring is provided in the pressure regulator screw step groove, and a pressure regulator limit gear lever is provided in the pressure regulator limit slip ring.

[0011] A pressure ring is sleeved on the outer wall of the voltage regulator rotating shaft, and the pressure ring is arranged between the voltage regulator fixing ring and the deep groove ball bearing a. The outer wall of the pressure ring contacts the voltage regulator slotted cylinder, and the pressure ring is used to fix the deep groove ball bearing a; a voltage regulator slotted cylinder clamping ring is provided at one end of the voltage regulator slotted cylinder close to the voltage regulator rotating shaft, and the voltage regulator fixing ring is clamped on the voltage regulator slotted cylinder clamping ring.

[0012] A plurality of O-rings e are sleeved in the sealing groove of the micro-pressure pump piston, and the plurality of O-rings e are arranged between the micro-pressure pump piston and the micro-pressure pump cylinder; a plurality of O-rings f are sleeved in the sealing groove of the outer wall of the pressure regulator rear cover, and the plurality of O-rings f are arranged between the pressure regulator rear cover and the micro-pressure pump cylinder; an O-ring g is arranged between the grooved cylinder of the pressure regulator and the connecting sleeve.

[0013] A connecting groove is provided at one end of the voltage regulator screw near the cylinder of the micro-pressure pump, a groove is provided on the piston of the micro-pressure pump, and the voltage regulator screw is fixedly connected with the piston of the micro-pressure pump through the connecting groove and the groove.

[0014] The beneficial effects of the present invention are: The positive and negative pressure integrated gas piston pressure gauge provided by the present invention has a piston housing provided with a positive pressure chamber and a negative pressure chamber, and the positive pressure chamber and the negative pressure chamber are effectively isolated by a high-precision sealing ring to ensure that the pressures of the two chambers do not interfere with each other. Sealing rings are also used at both ends for sealing to effectively prevent pressure leakage and ensure the accuracy of measurement; the positive pressure air inlet nozzle is connected to the positive pressure chamber, and the negative pressure air inlet nozzle is connected to the negative pressure chamber to ensure that the positive and negative pressure gases can smoothly enter the corresponding chambers; the rapid switching of positive and negative pressures is achieved by switching the positive and negative pressure piston valves. Positive and negative pressure calibration can be quickly switched within 30 seconds, shortening the calibration time and improving the efficiency of positive and negative pressure switching; the gauge pressure and vacuum starting values ​​of the pressure gauge are only 3kPa, and the minimum resolution is 1kPa, ensuring high-precision measurement; the minimum pressure measured by the piston is 3kPa, and the total mass of the piston and its tray is only 150g. The lightweight design improves the sensitivity and accuracy of the measurement; the piston rod is made of ceramic material, which has good wear resistance and corrosion resistance; the positive pressure piston tray is made of hard aluminum material, which is light and high in strength; the positive pressure chassis, the negative pressure piston rod locking nut, and the negative pressure connecting rod are all made of hard aluminum material to ensure the stability and reliability of the overall structure. The selection of this material ensures that the positive and negative pressure pistons and their trays meet the 150g mass requirement, achieving the balance of the mechanism and the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a positive and negative pressure integrated gas piston pressure gauge of the present invention; Figure 2 It is a schematic diagram of the pipeline connection of the positive and negative pressure integrated gas piston pressure gauge of the present invention; Figure 3 It is a structural schematic diagram of the piston system of the present invention; Figure 4 It is a structural schematic diagram of the cantilever of the present invention; Figure 5 It is a structural schematic diagram of the voltage regulator of the present invention.

[0016] In the figure, 1. piston system, 101. cantilever; 1010. first step, 1011. second step; 102. O-ring a, 103. housing, 104. gland, 105. bearing ring, 106. bearing, 107. positive pressure piston tray, 108. piston cylinder, 109. piston rod, 110. O-ring b, 111. O-ring c, 112. O-ring d, 1 13. Negative pressure piston rod locking nut, 114. Negative pressure connecting rod, 115. Negative pressure bottom plate, 116. Piston end cover, 117. Connecting sleeve, 118. Negative pressure chamber channel, 119. Positive pressure chamber channel, 120. Negative pressure chamber, 121. Positive pressure chamber, 122. Negative pressure sealing cylinder, 123. Positive pressure sealing cylinder; 2. Positive pressure weight; 3. Negative pressure weight; 4. Negative pressure piston valve; 5. Positive pressure piston valve; 6. filter; 7. meter seat valve a; 8. meter under test a; 9. meter under test b; 10. meter seat valve b; 11. negative pressure valve; 12. pressure regulator, 1201. pressure regulator rotating shaft, 1202. pressure regulator lead screw, 1203. pressure regulator fixing ring, 1204. deep groove ball bearing a, 1205. deep groove ball bearing b, 1206. pressure regulator slotted cylinder, 1207. pressure regulator limit slip ring, 1208. pressure regulator limit Shift lever, 1209. Connecting sleeve, 1210. Micro-pressure pump piston, 1211. Micro-pressure pump cylinder, 1212. Pressure regulator back cover, 1213. Pressure ring, 1214. O-ring e, 1215. O-ring f, 1216. O-ring g; 13. Pressure relief valve; 14. Pressure gauge; 15. Positive pressure valve, 16. Positive pressure air pipe, 17. Negative pressure air pipe, 18. Vacuum pump, 19. Bottom shell. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] The positive and negative pressure integrated gas piston pressure gauge provided by the present invention is as follows: Figure 1 As shown, it includes a positive pressure valve 15, the inlet end of the positive pressure valve 15 is connected to a positive pressure air pipe 16, the outlet end of the positive pressure valve 15 is connected to a four-way joint through a pipeline, the four-way joint is respectively connected to a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12 and a pressure gauge 14 through pipelines, the pressure regulator 12 is connected to a filter 6 through a pipeline, the filter 6 is respectively connected to a three-way joint and a pressure relief valve 13 through pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve 4 and a positive pressure piston valve 5 through pipelines, the output ends of the negative pressure piston valve 4 and the positive pressure piston valve 5 are respectively connected to a piston system 1 through pipelines, the piston system 1 is provided with a positive pressure weight 2 and a negative pressure weight 3, and also includes a negative pressure valve 11, the inlet end of the negative pressure valve 11 is connected to a negative pressure air pipe 17, and the outlet end of the negative pressure valve 11 is connected to the pressure regulator 12 through a pipeline. As shown Figure 2As shown, it also includes a bottom shell 19, a piston system 1, a negative pressure piston valve 4, a positive pressure piston valve 5, a filter 6, a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12, a pressure relief valve 13, a pressure gauge 14 and a positive pressure valve 15 are all arranged on the bottom shell 19; the other end of the gauge seat valve a7 is connected to the meter a8 to be tested through a pipeline, and the other end of the gauge seat valve b10 is connected to the meter b9 to be tested through a pipeline; a vacuum pump 18 is arranged on the negative pressure air pipe 17. Figure 3As shown, the piston system 1 includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the outer wall of the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. The shell 103 and the pressure cover 104 are provided with a piston assembly. The top of the piston assembly is fixedly connected to a piston end cover 116, and the top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The positive pressure weight 2 is arranged on the positive pressure piston tray 107. The outer wall of the bottom of the positive pressure piston tray 107 is sleeved with a bearing 106. The bearing 106 is fixedly connected to the inner wall of the pressure cover 104 through a bearing pressure ring 105. The piston assembly The bottom of the component is fixedly connected with a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixedly connected with a negative pressure bottom plate 115, and the negative pressure weight 3 is arranged on the negative pressure bottom plate 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119, one end of the negative pressure chamber channel 118 is connected with the negative pressure piston valve 4 through a pipeline, and the other end of the negative pressure chamber channel 118 leads to the negative pressure chamber 120, and one end of the positive pressure chamber channel 119 is connected with the positive pressure piston valve 5 through a pipeline, and the other end of the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixedly connected to the top of the shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, and the positive pressure sealing cylinder 123 is fixedly connected to the bottom of the shell 103. The negative pressure connecting rod 114 and the negative pressure chassis 115 are both arranged in the positive pressure sealing cylinder 123; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 is in contact with the inner wall of the outer shell 103, a piston rod 109 is arranged in the piston cylinder 108, the piston end cover 116 is fixedly connected to the top of the piston rod 109, and the piston rod 109 is fixedly connected to the negative pressure connecting rod 114 through a connecting sleeve 117; the connecting sleeve 117 is fixedly connected to the outer wall of the bottom of the piston rod 109, the inner wall of the bottom of the connecting sleeve 117 is in contact with the outer wall of the negative pressure connecting rod 114, and the negative pressure piston rod locking nut 113 is fixedly connected to the outer wall of the bottom of the connecting sleeve 117, and the negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114; the top of the outer shell 103 is axially tightened. A sealing groove is provided, and an O-ring a102 is provided in the sealing groove; an O-ring b110 is provided between the top of the shell 103 and the piston cylinder 108; the cantilever 101 is provided with a two-step step through hole of a first step 1010 and a second step 1011, and an O-ring c111 is provided on the inner wall of the cantilever 101 at the first step 1010 and the second step 1011; an O-ring d112 is sleeved on the outer wall of the bottom of the shell 103, and the O-ring d112 is provided between the shell 103 and the cantilever 101; the negative pressure chamber channel 118 passes through the cantilever 101, the shell 103 and the pressure cover 104 to enter the negative pressure chamber 120, and the positive pressure chamber channel 119 passes through the cantilever 101 and the shell 103 to enter the positive pressure chamber 121. Figure 5As shown, the voltage regulator 12 includes a voltage regulator lead screw 1202, one end of which is sleeved with a voltage regulator rotating shaft 1201 on its outer wall, and the other end of which is sleeved with a voltage regulator slotted cylinder 1206 on its outer wall, and one end of the voltage regulator rotating shaft 1201 close to the voltage regulator slotted cylinder 1206 is sleeved with a deep groove ball bearing a1204 and a deep groove ball bearing b1205 on its outer wall, and the outer walls of the deep groove ball bearings a1204 and the deep groove ball bearings b1205 are in contact with the inner wall of one end of the voltage regulator slotted cylinder 1206 close to the voltage regulator rotating shaft 1201, and one end of the voltage regulator slotted cylinder 1206 close to the voltage regulator rotating shaft 1201 is clamped with a voltage regulator fixing ring 1203, and the voltage regulator A micro-pressure pump piston 1210 is fixedly connected to one end of the pressure regulator screw 1202 away from the pressure regulator rotating shaft 1201, and a micro-pressure pump cylinder 1211 is sleeved on the outer wall of the micro-pressure pump piston 1210. The pressure regulator slotted cylinder 1206 is connected to the micro-pressure pump cylinder 1211 through a connecting sleeve 1209. A pressure regulator rear cover 1212 is provided at one end of the micro-pressure pump cylinder 1211 away from the pressure regulator screw 1202. The pressure regulator rear cover 1212 is connected to the filter 6, the negative pressure valve 11, the pressure relief valve 13 and the four-way joint through four pipelines respectively. A slide groove is horizontally provided on the pressure regulator slotted cylinder 1206 along the axial direction, and a pressure regulator screw step groove is vertically provided on the pressure regulator screw 1202. A voltage regulator limiting slip ring 1207 is arranged in the stepped groove, and a voltage regulator limiting lever 1208 is arranged in the voltage regulator limiting slip ring 1207; a pressure ring 1213 is sleeved on the outer wall of the voltage regulator rotating shaft 1201, and the pressure ring 1213 is arranged between the voltage regulator fixing ring 1203 and the deep groove ball bearing a1204, and the outer wall of the pressure ring 1213 contacts the voltage regulator slotted cylinder 1206, and the pressure ring 1213 is used to fix the deep groove ball bearing a1204; a voltage regulator slotted cylinder 1206 is provided with a voltage regulator slotted cylinder clamping ring at one end close to the voltage regulator rotating shaft 1201, and the voltage regulator fixing ring 1203 is clamped on the voltage regulator slotted cylinder clamping ring; a plurality of O-type sealing rings are sleeved in the sealing groove of the micro-pressure pump piston 1210 Sealing ring e1214, several O-rings e1214 are arranged between the micro-pressure pump piston 1210 and the micro-pressure pump cylinder 1211; several O-rings f1215 are sleeved in the sealing groove on the outer wall of the pressure regulator back cover 1212, and several O-rings f1215 are arranged between the pressure regulator back cover 1212 and the micro-pressure pump cylinder 1211; an O-ring g1216 is arranged between the pressure regulator slotted cylinder 1206 and the connecting sleeve 1209; a connecting groove is arranged at one end of the pressure regulator screw 1202 close to the micro-pressure pump cylinder 1211, and a groove is arranged on the micro-pressure pump piston 1210, and the pressure regulator screw 1202 is fixedly connected to the micro-pressure pump piston 1210 through the connecting groove and the groove. Apply butter on the surface of the voltage regulator lead screw 1202 and screw it into the voltage regulator rotating shaft 1201; install the deep groove ball bearing b1205 on the voltage regulator slotted cylinder 1206, install the previous process, and sleeve the deep groove ball bearing a1204 on the voltage regulator rotating shaft 1201, and lock the connection with the pressure ring 1213; install the O-ring f1215 in the sealing groove of the voltage regulator rear cover 1212, apply lubricating oil on the surface of the O-ring f1215 and install it into the micro-pressure pump cylinder 1211 ; Install the O-ring e1214 into the sealing groove of the micro-pressure pump piston 1210, and apply lubricating oil on the surface of the O-ring e1214; the connecting sleeve 1209 passes through the slotted cylinder 1206 of the pressure regulator, and the pressure regulator screw 1202 connects the slot sleeve and the groove of the micro-pressure pump piston 1210, and pushes it into the micro-pressure pump cylinder 1211; use the connecting sleeve 1209 to fasten the micro-pressure pump cylinder 1211; the pressure regulator fixing ring 1203 fastens the installed pressure regulator 12.

[0019] When calibrating the inspected meters a8 and b9, add weights corresponding to the first measured pressure value on the positive pressure piston tray 107 or the negative pressure bottom plate 115, use both hands to rotate the weights on the tray to make the rotation speed reach 30-60r / min, then rotate the pressure regulator 12 clockwise to apply pressure until the piston is observed to rise and then stop applying pressure. When the piston system 1 stabilizes at a certain height and the system is balanced, it can be seen that the pressure of the pressure value to be measured on the bottom of the piston is balanced with the total gravity of the piston rod system including the weight. According to PS=mg, the pressure value to be measured can be measured. At this time, the pressure of the entire system is the measured pressure value, and the data is recorded.

[0020] Example 1 The positive and negative pressure integrated gas piston pressure gauge proposed in this embodiment is as follows: Figure 1 As shown, it includes a positive pressure valve 15, the inlet end of the positive pressure valve 15 is connected to a positive pressure air pipe 16, the outlet end of the positive pressure valve 15 is connected to a four-way joint through a pipeline, the four-way joint is respectively connected to a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12 and a pressure gauge 14 through pipelines, the pressure regulator 12 is connected to a filter 6 through a pipeline, the filter 6 is respectively connected to a three-way joint and a pressure relief valve 13 through pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve 4 and a positive pressure piston valve 5 through pipelines, the output ends of the negative pressure piston valve 4 and the positive pressure piston valve 5 are respectively connected to a piston system 1 through pipelines, the piston system 1 is provided with a positive pressure weight 2 and a negative pressure weight 3, and also includes a negative pressure valve 11, the inlet end of the negative pressure valve 11 is connected to a negative pressure air pipe 17, and the outlet end of the negative pressure valve 11 is connected to the pressure regulator 12 through a pipeline.

[0021] Example 2 The positive and negative pressure integrated gas piston pressure gauge proposed in this embodiment is as follows: Figure 1As shown, it includes a positive pressure valve 15, the inlet end of the positive pressure valve 15 is connected to a positive pressure air pipe 16, the outlet end of the positive pressure valve 15 is connected to a four-way joint through a pipeline, the four-way joint is respectively connected to a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12 and a pressure gauge 14 through pipelines, the pressure regulator 12 is connected to a filter 6 through a pipeline, the filter 6 is respectively connected to a three-way joint and a pressure relief valve 13 through pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve 4 and a positive pressure piston valve 5 through pipelines, the output ends of the negative pressure piston valve 4 and the positive pressure piston valve 5 are respectively connected to a piston system 1 through pipelines, the piston system 1 is provided with a positive pressure weight 2 and a negative pressure weight 3, and also includes a negative pressure valve 11, the inlet end of the negative pressure valve 11 is connected to a negative pressure air pipe 17, and the outlet end of the negative pressure valve 11 is connected to the pressure regulator 12 through a pipeline. As shown Figure 2 As shown, it also includes a bottom shell 19, a piston system 1, a negative pressure piston valve 4, a positive pressure piston valve 5, a filter 6, a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12, a pressure relief valve 13, a pressure gauge 14 and a positive pressure valve 15 are all arranged on the bottom shell 19; the other end of the gauge seat valve a7 is connected to the inspected meter a8 through a pipeline, and the other end of the gauge seat valve b10 is connected to the inspected meter b9 through a pipeline; a vacuum pump 18 is provided on the negative pressure air pipe 17.

[0022] Example 3 The positive and negative pressure integrated gas piston pressure gauge proposed in this embodiment is as follows: Figure 1 As shown, it includes a positive pressure valve 15, the inlet end of the positive pressure valve 15 is connected to a positive pressure air pipe 16, the outlet end of the positive pressure valve 15 is connected to a four-way joint through a pipeline, the four-way joint is respectively connected to a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12 and a pressure gauge 14 through pipelines, the pressure regulator 12 is connected to a filter 6 through a pipeline, the filter 6 is respectively connected to a three-way joint and a pressure relief valve 13 through pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve 4 and a positive pressure piston valve 5 through pipelines, the output ends of the negative pressure piston valve 4 and the positive pressure piston valve 5 are respectively connected to a piston system 1 through pipelines, the piston system 1 is provided with a positive pressure weight 2 and a negative pressure weight 3, and also includes a negative pressure valve 11, the inlet end of the negative pressure valve 11 is connected to a negative pressure air pipe 17, and the outlet end of the negative pressure valve 11 is connected to the pressure regulator 12 through a pipeline. As shown Figure 2 As shown, it also includes a bottom shell 19, a piston system 1, a negative pressure piston valve 4, a positive pressure piston valve 5, a filter 6, a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12, a pressure relief valve 13, a pressure gauge 14 and a positive pressure valve 15 are all arranged on the bottom shell 19; the other end of the gauge seat valve a7 is connected to the meter a8 to be tested through a pipeline, and the other end of the gauge seat valve b10 is connected to the meter b9 to be tested through a pipeline; a vacuum pump 18 is arranged on the negative pressure air pipe 17. Figure 3As shown, the piston system 1 includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the outer wall of the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. The shell 103 and the pressure cover 104 are provided with a piston assembly. The top of the piston assembly is fixedly connected to a piston end cover 116, and the top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The positive pressure weight 2 is arranged on the positive pressure piston tray 107, and the outer wall of the bottom of the positive pressure piston tray 107 is sleeved with a bearing 106, the bearing 106 is fixedly connected to the inner wall of the pressure cover 104 through the bearing pressure ring 105, the bottom of the piston assembly is fixedly connected to the negative pressure connecting rod 114 through the connecting sleeve 117, the other end of the negative pressure connecting rod 114 is fixedly connected to the negative pressure base 115, the negative pressure weight 3 is arranged on the negative pressure base 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119, one end of the negative pressure chamber channel 118 is connected to the negative pressure piston valve 4 through a pipeline, and the other end of the negative pressure chamber channel 118 leads to the negative pressure chamber 120, one end of the positive pressure chamber channel 119 is connected to the positive pressure piston valve 5 through a pipeline, and the other end of the positive pressure chamber channel 119 leads to the positive pressure chamber 121. Example 4 The positive and negative pressure integrated gas piston pressure gauge proposed in this embodiment is as follows: Figure 1 As shown, it includes a positive pressure valve 15, the inlet end of the positive pressure valve 15 is connected to a positive pressure air pipe 16, the outlet end of the positive pressure valve 15 is connected to a four-way joint through a pipeline, the four-way joint is respectively connected to a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12 and a pressure gauge 14 through pipelines, the pressure regulator 12 is connected to a filter 6 through a pipeline, the filter 6 is respectively connected to a three-way joint and a pressure relief valve 13 through pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve 4 and a positive pressure piston valve 5 through pipelines, the output ends of the negative pressure piston valve 4 and the positive pressure piston valve 5 are respectively connected to a piston system 1 through pipelines, the piston system 1 is provided with a positive pressure weight 2 and a negative pressure weight 3, and also includes a negative pressure valve 11, the inlet end of the negative pressure valve 11 is connected to a negative pressure air pipe 17, and the outlet end of the negative pressure valve 11 is connected to the pressure regulator 12 through a pipeline. As shown Figure 2 As shown, it also includes a bottom shell 19, a piston system 1, a negative pressure piston valve 4, a positive pressure piston valve 5, a filter 6, a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12, a pressure relief valve 13, a pressure gauge 14 and a positive pressure valve 15 are all arranged on the bottom shell 19; the other end of the gauge seat valve a7 is connected to the meter a8 to be tested through a pipeline, and the other end of the gauge seat valve b10 is connected to the meter b9 to be tested through a pipeline; a vacuum pump 18 is arranged on the negative pressure air pipe 17. Figure 3As shown, the piston system 1 includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the outer wall of the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. The shell 103 and the pressure cover 104 are provided with a piston assembly. The top of the piston assembly is fixedly connected to a piston end cover 116, and the top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The positive pressure weight 2 is arranged on the positive pressure piston tray 107. The outer wall of the bottom of the positive pressure piston tray 107 is sleeved with a bearing 106. The bearing 106 is fixedly connected to the inner wall of the pressure cover 104 through a bearing pressure ring 105. The piston assembly The bottom of the component is fixedly connected with a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixedly connected with a negative pressure bottom plate 115, and the negative pressure weight 3 is arranged on the negative pressure bottom plate 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119, one end of the negative pressure chamber channel 118 is connected with the negative pressure piston valve 4 through a pipeline, and the other end of the negative pressure chamber channel 118 leads to the negative pressure chamber 120, and one end of the positive pressure chamber channel 119 is connected with the positive pressure piston valve 5 through a pipeline, and the other end of the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixedly connected to the top of the shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, and the positive pressure sealing cylinder 123 is fixedly connected to the bottom of the shell 103. The negative pressure connecting rod 114 and the negative pressure chassis 115 are both arranged in the positive pressure sealing cylinder 123; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 is in contact with the inner wall of the outer shell 103, a piston rod 109 is arranged in the piston cylinder 108, the piston end cover 116 is fixedly connected to the top of the piston rod 109, and the piston rod 109 is fixedly connected to the negative pressure connecting rod 114 through a connecting sleeve 117; the connecting sleeve 117 is fixedly connected to the outer wall of the bottom of the piston rod 109, the inner wall of the bottom of the connecting sleeve 117 is in contact with the outer wall of the negative pressure connecting rod 114, and the negative pressure piston rod locking nut 113 is fixedly connected to the outer wall of the bottom of the connecting sleeve 117, and the negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114; the top of the outer shell 103 is axially tightened. A sealing groove is provided, in which an O-ring a102 is provided; an O-ring b110 is provided between the top of the outer shell 103 and the piston cylinder 108; the cantilever 101 is provided with a two-step step through hole of a first step 1010 and a second step 1011, and an O-ring c111 is provided on the inner wall of the cantilever 101 at the first step 1010 and the second step 1011; an O-ring d112 is sleeved on the outer wall of the bottom of the outer shell 103, and the O-ring d112 is arranged between the outer shell 103 and the cantilever 101; the negative pressure chamber channel 118 passes through the cantilever 101, the outer shell 103 and the pressure cover 104 to enter the negative pressure chamber 120, and the positive pressure chamber channel 119 passes through the cantilever 101 and the outer shell 103 to enter the positive pressure chamber 121.

[0023] Example 5 The positive and negative pressure integrated gas piston pressure gauge proposed in this embodiment is as follows: Figure 1 As shown, it includes a positive pressure valve 15, the inlet end of the positive pressure valve 15 is connected to a positive pressure air pipe 16, the outlet end of the positive pressure valve 15 is connected to a four-way joint through a pipeline, the four-way joint is respectively connected to a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12 and a pressure gauge 14 through pipelines, the pressure regulator 12 is connected to a filter 6 through a pipeline, the filter 6 is respectively connected to a three-way joint and a pressure relief valve 13 through pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve 4 and a positive pressure piston valve 5 through pipelines, the output ends of the negative pressure piston valve 4 and the positive pressure piston valve 5 are respectively connected to a piston system 1 through pipelines, the piston system 1 is provided with a positive pressure weight 2 and a negative pressure weight 3, and also includes a negative pressure valve 11, the inlet end of the negative pressure valve 11 is connected to a negative pressure air pipe 17, and the outlet end of the negative pressure valve 11 is connected to the pressure regulator 12 through a pipeline. As shown Figure 2 As shown, it also includes a bottom shell 19, a piston system 1, a negative pressure piston valve 4, a positive pressure piston valve 5, a filter 6, a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12, a pressure relief valve 13, a pressure gauge 14 and a positive pressure valve 15 are all arranged on the bottom shell 19; the other end of the gauge seat valve a7 is connected to the meter a8 to be tested through a pipeline, and the other end of the gauge seat valve b10 is connected to the meter b9 to be tested through a pipeline; a vacuum pump 18 is arranged on the negative pressure air pipe 17. Figure 3As shown, the piston system 1 includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the outer wall of the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. The shell 103 and the pressure cover 104 are provided with a piston assembly. The top of the piston assembly is fixedly connected to a piston end cover 116, and the top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The positive pressure weight 2 is arranged on the positive pressure piston tray 107. The outer wall of the bottom of the positive pressure piston tray 107 is sleeved with a bearing 106. The bearing 106 is fixedly connected to the inner wall of the pressure cover 104 through a bearing pressure ring 105. The piston assembly The bottom of the component is fixedly connected with a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixedly connected with a negative pressure bottom plate 115, and the negative pressure weight 3 is arranged on the negative pressure bottom plate 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119, one end of the negative pressure chamber channel 118 is connected with the negative pressure piston valve 4 through a pipeline, and the other end of the negative pressure chamber channel 118 leads to the negative pressure chamber 120, and one end of the positive pressure chamber channel 119 is connected with the positive pressure piston valve 5 through a pipeline, and the other end of the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixedly connected to the top of the shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, and the positive pressure sealing cylinder 123 is fixedly connected to the bottom of the shell 103. The negative pressure connecting rod 114 and the negative pressure chassis 115 are both arranged in the positive pressure sealing cylinder 123; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 is in contact with the inner wall of the outer shell 103, a piston rod 109 is arranged in the piston cylinder 108, the piston end cover 116 is fixedly connected to the top of the piston rod 109, and the piston rod 109 is fixedly connected to the negative pressure connecting rod 114 through a connecting sleeve 117; the connecting sleeve 117 is fixedly connected to the outer wall of the bottom of the piston rod 109, the inner wall of the bottom of the connecting sleeve 117 is in contact with the outer wall of the negative pressure connecting rod 114, and the negative pressure piston rod locking nut 113 is fixedly connected to the outer wall of the bottom of the connecting sleeve 117, and the negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114; the top of the outer shell 103 is axially tightened. A sealing groove is provided, and an O-ring a102 is provided in the sealing groove; an O-ring b110 is provided between the top of the shell 103 and the piston cylinder 108; the cantilever 101 is provided with a two-step step through hole of a first step 1010 and a second step 1011, and an O-ring c111 is provided on the inner wall of the cantilever 101 at the first step 1010 and the second step 1011; an O-ring d112 is sleeved on the outer wall of the bottom of the shell 103, and the O-ring d112 is provided between the shell 103 and the cantilever 101; the negative pressure chamber channel 118 passes through the cantilever 101, the shell 103 and the pressure cover 104 to enter the negative pressure chamber 120, and the positive pressure chamber channel 119 passes through the cantilever 101 and the shell 103 to enter the positive pressure chamber 121. Figure 5As shown, the voltage regulator 12 includes a voltage regulator lead screw 1202, one end of which is sleeved with a voltage regulator rotating shaft 1201 on its outer wall, and the other end of which is sleeved with a voltage regulator slotted cylinder 1206 on its outer wall, and one end of the voltage regulator rotating shaft 1201 close to the voltage regulator slotted cylinder 1206 is sleeved with a deep groove ball bearing a1204 and a deep groove ball bearing b1205 on its outer wall, and the outer walls of the deep groove ball bearings a1204 and the deep groove ball bearings b1205 are in contact with the inner wall of one end of the voltage regulator slotted cylinder 1206 close to the voltage regulator rotating shaft 1201, and one end of the voltage regulator slotted cylinder 1206 close to the voltage regulator rotating shaft 1201 is clamped with a voltage regulator fixing ring 1203, and the voltage regulator A micro-pressure pump piston 1210 is fixedly connected to one end of the pressure regulator screw 1202 away from the pressure regulator rotating shaft 1201, and a micro-pressure pump cylinder 1211 is sleeved on the outer wall of the micro-pressure pump piston 1210. The pressure regulator slotted cylinder 1206 is connected to the micro-pressure pump cylinder 1211 through a connecting sleeve 1209. A pressure regulator rear cover 1212 is provided at one end of the micro-pressure pump cylinder 1211 away from the pressure regulator screw 1202. The pressure regulator rear cover 1212 is connected to the filter 6, the negative pressure valve 11, the pressure relief valve 13 and the four-way joint through four pipelines respectively. A slide groove is horizontally provided on the pressure regulator slotted cylinder 1206 along the axial direction, and a pressure regulator screw step groove is vertically provided on the pressure regulator screw 1202. A voltage regulator limiting slip ring 1207 is arranged in the stepped groove, and a voltage regulator limiting lever 1208 is arranged in the voltage regulator limiting slip ring 1207; a pressure ring 1213 is sleeved on the outer wall of the voltage regulator rotating shaft 1201, and the pressure ring 1213 is arranged between the voltage regulator fixing ring 1203 and the deep groove ball bearing a1204, and the outer wall of the pressure ring 1213 contacts the voltage regulator slotted cylinder 1206, and the pressure ring 1213 is used to fix the deep groove ball bearing a1204; a voltage regulator slotted cylinder 1206 is provided with a voltage regulator slotted cylinder clamping ring at one end close to the voltage regulator rotating shaft 1201, and the voltage regulator fixing ring 1203 is clamped on the voltage regulator slotted cylinder clamping ring; a plurality of O-type sealing rings are sleeved in the sealing groove of the micro-pressure pump piston 1210 Sealing ring e1214, several O-rings e1214 are arranged between the micro-pressure pump piston 1210 and the micro-pressure pump cylinder 1211; several O-rings f1215 are sleeved in the sealing groove on the outer wall of the pressure regulator back cover 1212, and several O-rings f1215 are arranged between the pressure regulator back cover 1212 and the micro-pressure pump cylinder 1211; an O-ring g1216 is arranged between the pressure regulator slotted cylinder 1206 and the connecting sleeve 1209; a connecting groove is arranged at one end of the pressure regulator screw 1202 close to the micro-pressure pump cylinder 1211, and a groove is arranged on the micro-pressure pump piston 1210, and the pressure regulator screw 1202 is fixedly connected to the micro-pressure pump piston 1210 through the connecting groove and the groove.

[0024] Example 6 The positive and negative pressure integrated gas piston pressure gauge proposed in this embodiment is as follows: Figure 1As shown, it includes a positive pressure valve 15, the inlet end of the positive pressure valve 15 is connected to a positive pressure air pipe 16, the outlet end of the positive pressure valve 15 is connected to a four-way joint through a pipeline, the four-way joint is respectively connected to a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12 and a pressure gauge 14 through pipelines, the pressure regulator 12 is connected to a filter 6 through a pipeline, the filter 6 is respectively connected to a three-way joint and a pressure relief valve 13 through pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve 4 and a positive pressure piston valve 5 through pipelines, the output ends of the negative pressure piston valve 4 and the positive pressure piston valve 5 are respectively connected to a piston system 1 through pipelines, the piston system 1 is provided with a positive pressure weight 2 and a negative pressure weight 3, and also includes a negative pressure valve 11, the inlet end of the negative pressure valve 11 is connected to a negative pressure air pipe 17, and the outlet end of the negative pressure valve 11 is connected to the pressure regulator 12 through a pipeline. As shown Figure 2 As shown, it also includes a bottom shell 19, a piston system 1, a negative pressure piston valve 4, a positive pressure piston valve 5, a filter 6, a gauge seat valve a7, a gauge seat valve b10, a pressure regulator 12, a pressure relief valve 13, a pressure gauge 14 and a positive pressure valve 15 are all arranged on the bottom shell 19; the other end of the gauge seat valve a7 is connected to the meter a8 to be tested through a pipeline, and the other end of the gauge seat valve b10 is connected to the meter b9 to be tested through a pipeline; a vacuum pump 18 is arranged on the negative pressure air pipe 17. Figure 3As shown, the piston system 1 includes a cantilever 101, a cantilever through hole is opened in the middle of the cantilever 101, and also includes a shell 103, a negative pressure sealing cylinder 122 and a positive pressure sealing cylinder 123. The bottom of the shell 103 is arranged in the cantilever through hole, and the outer wall of the top of the shell 103 is sleeved with a pressure cover 104. The shell 103 and the pressure cover 104 are both hollow structures. The shell 103 and the pressure cover 104 are provided with a piston assembly. The top of the piston assembly is fixedly connected to a piston end cover 116, and the top of the piston end cover 116 is fixedly connected to a positive pressure piston tray 107. The positive pressure weight 2 is arranged on the positive pressure piston tray 107. The outer wall of the bottom of the positive pressure piston tray 107 is sleeved with a bearing 106. The bearing 106 is fixedly connected to the inner wall of the pressure cover 104 through a bearing pressure ring 105. The piston assembly The bottom of the component is fixedly connected with a negative pressure connecting rod 114 through a connecting sleeve 117, and the other end of the negative pressure connecting rod 114 is fixedly connected with a negative pressure bottom plate 115, and the negative pressure weight 3 is arranged on the negative pressure bottom plate 115, and also includes a negative pressure chamber channel 118 and a positive pressure chamber channel 119, one end of the negative pressure chamber channel 118 is connected with the negative pressure piston valve 4 through a pipeline, and the other end of the negative pressure chamber channel 118 leads to the negative pressure chamber 120, and one end of the positive pressure chamber channel 119 is connected with the positive pressure piston valve 5 through a pipeline, and the other end of the positive pressure chamber channel 119 leads to the positive pressure chamber 121; the negative pressure sealing cylinder 122 is fixedly connected to the top of the shell 103, the pressure cover 104 and the positive pressure piston tray 107 are both provided with a negative pressure sealing cylinder 122, and the positive pressure sealing cylinder 123 is fixedly connected to the bottom of the shell 103. The negative pressure connecting rod 114 and the negative pressure chassis 115 are both arranged in the positive pressure sealing cylinder 123; the piston assembly includes a piston cylinder 108, the outer wall of the piston cylinder 108 is in contact with the inner wall of the outer shell 103, a piston rod 109 is arranged in the piston cylinder 108, the piston end cover 116 is fixedly connected to the top of the piston rod 109, and the piston rod 109 is fixedly connected to the negative pressure connecting rod 114 through a connecting sleeve 117; the connecting sleeve 117 is fixedly connected to the outer wall of the bottom of the piston rod 109, the inner wall of the bottom of the connecting sleeve 117 is in contact with the outer wall of the negative pressure connecting rod 114, and the negative pressure piston rod locking nut 113 is fixedly connected to the outer wall of the bottom of the connecting sleeve 117, and the negative pressure piston rod locking nut 113 is sleeved on the outer wall of the negative pressure connecting rod 114; the top of the outer shell 103 is axially tightened. A sealing groove is provided, and an O-ring a102 is provided in the sealing groove; an O-ring b110 is provided between the top of the shell 103 and the piston cylinder 108; the cantilever 101 is provided with a two-step step through hole of a first step 1010 and a second step 1011, and an O-ring c111 is provided on the inner wall of the cantilever 101 at the first step 1010 and the second step 1011; an O-ring d112 is sleeved on the outer wall of the bottom of the shell 103, and the O-ring d112 is provided between the shell 103 and the cantilever 101; the negative pressure chamber channel 118 passes through the cantilever 101, the shell 103 and the pressure cover 104 to enter the negative pressure chamber 120, and the positive pressure chamber channel 119 passes through the cantilever 101 and the shell 103 to enter the positive pressure chamber 121. Figure 5As shown, the voltage regulator 12 includes a voltage regulator lead screw 1202, one end of which is sleeved with a voltage regulator rotating shaft 1201 on its outer wall, and the other end of which is sleeved with a voltage regulator slotted cylinder 1206 on its outer wall, and one end of the voltage regulator rotating shaft 1201 close to the voltage regulator slotted cylinder 1206 is sleeved with a deep groove ball bearing a1204 and a deep groove ball bearing b1205 on its outer wall, and the outer walls of the deep groove ball bearings a1204 and the deep groove ball bearings b1205 are in contact with the inner wall of one end of the voltage regulator slotted cylinder 1206 close to the voltage regulator rotating shaft 1201, and one end of the voltage regulator slotted cylinder 1206 close to the voltage regulator rotating shaft 1201 is clamped with a voltage regulator fixing ring 1203, and the voltage regulator A micro-pressure pump piston 1210 is fixedly connected to one end of the pressure regulator screw 1202 away from the pressure regulator rotating shaft 1201, and a micro-pressure pump cylinder 1211 is sleeved on the outer wall of the micro-pressure pump piston 1210. The pressure regulator slotted cylinder 1206 is connected to the micro-pressure pump cylinder 1211 through a connecting sleeve 1209. A pressure regulator rear cover 1212 is provided at one end of the micro-pressure pump cylinder 1211 away from the pressure regulator screw 1202. The pressure regulator rear cover 1212 is connected to the filter 6, the negative pressure valve 11, the pressure relief valve 13 and the four-way joint through four pipelines respectively. A slide groove is horizontally provided on the pressure regulator slotted cylinder 1206 along the axial direction, and a pressure regulator screw step groove is vertically provided on the pressure regulator screw 1202. A voltage regulator limiting slip ring 1207 is arranged in the stepped groove, and a voltage regulator limiting lever 1208 is arranged in the voltage regulator limiting slip ring 1207; a pressure ring 1213 is sleeved on the outer wall of the voltage regulator rotating shaft 1201, and the pressure ring 1213 is arranged between the voltage regulator fixing ring 1203 and the deep groove ball bearing a1204, and the outer wall of the pressure ring 1213 contacts the voltage regulator slotted cylinder 1206, and the pressure ring 1213 is used to fix the deep groove ball bearing a1204; a voltage regulator slotted cylinder 1206 is provided with a voltage regulator slotted cylinder clamping ring at one end close to the voltage regulator rotating shaft 1201, and the voltage regulator fixing ring 1203 is clamped on the voltage regulator slotted cylinder clamping ring; a plurality of O-type sealing rings are sleeved in the sealing groove of the micro-pressure pump piston 1210 Sealing ring e1214, several O-rings e1214 are arranged between the micro-pressure pump piston 1210 and the micro-pressure pump cylinder 1211; several O-rings f1215 are sleeved in the sealing groove on the outer wall of the pressure regulator back cover 1212, and several O-rings f1215 are arranged between the pressure regulator back cover 1212 and the micro-pressure pump cylinder 1211; an O-ring g1216 is arranged between the pressure regulator slotted cylinder 1206 and the connecting sleeve 1209; a connecting groove is arranged at one end of the pressure regulator screw 1202 close to the micro-pressure pump cylinder 1211, and a groove is arranged on the micro-pressure pump piston 1210, and the pressure regulator screw 1202 is fixedly connected to the micro-pressure pump piston 1210 through the connecting groove and the groove.

[0025] The gauge pressure and vacuum starting values ​​of this pressure gauge are only 3 kPa, which requires that the mass of the piston rod 109 and the negative pressure bottom plate 115 be as small as possible; according to the principle of static balance, PS = mg, and the area S is 5 cm 2When the minimum pressure P measured by the piston is 3 kPa, the sum of the masses of the piston rod 109 and the negative pressure bottom plate 115 is calculated to be m=150 g; When the piston rod 109 is made of ceramic, the density is 3.12 g / cm 3 , using this material, the mass of the piston rod 109 is 45g; The positive pressure piston tray 107 is made of hard aluminum with a density of 2.72g / cm 3 , the pallet mass is 105g.

[0026] The negative pressure chassis 115, the negative pressure piston rod locking nut 113, and the negative pressure connecting rod 114 are all made of hard aluminum with a density of 2.72g / cm 3 , the total mass of the three is 105g; this can meet the requirements.

[0027] The measuring range of this pressure gauge is (-100~-3) kPa, (3~250) kPa, the minimum resolution is 1 kPa, and the weight configuration is: Table 1: Weight configuration

Claims

1. Positive and negative pressure integrated gas piston pressure gauge, characterized in that: The invention comprises a positive pressure valve (15), wherein the inlet end of the positive pressure valve (15) is connected to a positive pressure air pipe (16), the outlet end of the positive pressure valve (15) is connected to a four-way joint via a pipeline, the four-way joint is respectively connected to a gauge seat valve a (7), a gauge seat valve b (10), a pressure regulator (12) and a pressure gauge (14) via pipelines, the pressure regulator (12) is connected to a filter (6) via a pipeline, the filter (6) is respectively connected to a three-way joint and a pressure relief valve (13) via pipelines, the two output ends of the three-way joint are respectively connected to a negative pressure piston valve (4) and a positive pressure piston valve (5) via pipelines, the output ends of the negative pressure piston valve (4) and the positive pressure piston valve (5) are respectively connected to a piston system (1) via pipelines, the piston system (1) is provided with a positive pressure weight (2) and a negative pressure weight (3), and further comprises a negative pressure valve (11), the inlet end of the negative pressure valve (11) is connected to a negative pressure air pipe (17), and the outlet end of the negative pressure valve (11) is connected to the pressure regulator (12) via a pipeline.

2. The positive and negative pressure integrated gas piston pressure gauge according to claim 1, characterized in that: It also includes a bottom shell (19), and the piston system (1), the negative pressure piston valve (4), the positive pressure piston valve (5), the filter (6), the gauge seat valve a (7), the gauge seat valve b (10), the pressure regulator (12), the pressure relief valve (13), the pressure gauge (14) and the positive pressure valve (15) are all arranged on the bottom shell (19).

3. The positive and negative pressure integrated gas piston pressure gauge according to claim 1, characterized in that: The other end of the meter seat valve a (7) is connected to the meter to be tested a (8) through a pipeline, and the other end of the meter seat valve b (10) is connected to the meter to be tested b (9) through a pipeline.

4. The positive and negative pressure integrated gas piston pressure gauge according to claim 1, characterized in that: The negative pressure air pipe (17) is provided with a vacuum pump (18).

5. The positive and negative pressure integrated gas piston pressure gauge according to claim 1, characterized in that: The piston system (1) comprises a cantilever (101), a cantilever through hole is provided in the middle of the cantilever (101), and also comprises a shell (103), a negative pressure sealing cylinder (122) and a positive pressure sealing cylinder (123). The bottom of the shell (103) is arranged in the cantilever through hole, and the top outer wall of the shell (103) is sleeved with a gland (104). The shell (103) and the gland (104) are both hollow structures. A piston assembly is arranged in the shell (103) and the gland (104). The top of the piston assembly is fixedly connected to a piston end cover (116), and the top of the piston end cover (116) is fixedly connected to a positive pressure piston tray (107). The positive pressure weight (2) is arranged on the positive pressure piston tray (107), and the bottom outer wall of the positive pressure piston tray (107) is sleeved with a bearing (106), the bearing (106) is fixedly connected to the inner wall of the pressure cover (104) through a bearing pressure ring (105), the bottom of the piston assembly is fixedly connected to a negative pressure connecting rod (114) through a connecting sleeve (117), the other end of the negative pressure connecting rod (114) is fixedly connected to a negative pressure base (115), the negative pressure weight (3) is arranged on the negative pressure base (115), and also includes a negative pressure chamber channel (118) and a positive pressure chamber channel (119), one end of the negative pressure chamber channel (118) is connected to the negative pressure piston valve (4) through a pipeline, and the other end of the negative pressure chamber channel (118) is connected to the negative pressure chamber (120), one end of the positive pressure chamber channel (119) is connected to the positive pressure piston valve (5) through a pipeline, and the other end of the positive pressure chamber channel (119) is connected to the positive pressure chamber (121).

6. The positive and negative pressure integrated gas piston pressure gauge according to claim 5, characterized in that: The negative pressure sealing cylinder (122) is fixedly connected to the top of the outer shell (103); the pressure cover (104) and the positive pressure piston tray (107) are both arranged in the negative pressure sealing cylinder (122); the positive pressure sealing cylinder (123) is fixedly connected to the bottom of the outer shell (103); the negative pressure connecting rod (114) and the negative pressure bottom plate (115) are both arranged in the positive pressure sealing cylinder (123); the piston assembly includes a piston cylinder (108); the outer wall of the piston cylinder (108) is in contact with the inner wall of the outer shell (103); (108) is provided with a piston rod (109), the piston end cover (116) is fixedly connected to the top of the piston rod (109), and the piston rod (109) is fixedly connected to the negative pressure connecting rod (114) through a connecting sleeve (117); the connecting sleeve (117) is fixedly connected to the bottom outer wall of the piston rod (109), the bottom inner wall of the connecting sleeve (117) is in contact with the outer wall of the negative pressure connecting rod (114), and the bottom outer wall of the connecting sleeve (117) is fixedly connected to a negative pressure piston rod locking nut (113), the A negative pressure piston rod locking nut (113) is sleeved on the outer wall of the negative pressure connecting rod (114); a sealing groove is axially provided at the top of the housing (103), and an O-type sealing ring a (102) is provided in the sealing groove; an O-type sealing ring b (110) is provided between the top of the housing (103) and the piston cylinder (108); a two-step step through hole of a first step (1010) and a second step (1011) is provided on the cantilever (101); an inner wall of the cantilever (101) is provided between the first step (1010) and the second step (1011); An O-ring c (111) is provided at the second step (1011); an O-ring d (112) is sleeved on the outer wall of the bottom of the shell (103), and the O-ring d (112) is arranged between the shell (103) and the cantilever (101); the negative pressure chamber channel (118) passes through the cantilever (101), the shell (103) and the pressure cover (104) to enter the negative pressure chamber (120), and the positive pressure chamber channel (119) passes through the cantilever (101) and the shell (103) to enter the positive pressure chamber (121).

7. The positive and negative pressure integrated gas piston pressure gauge according to claim 1, characterized in that: The voltage regulator (12) comprises a voltage regulator lead screw (1202), one end of the voltage regulator lead screw (1202) is sleeved with a voltage regulator rotating shaft (1201) on its outer wall, the other end of the voltage regulator lead screw (1202) is sleeved with a voltage regulator slotted barrel (1206) on its outer wall, and one end of the voltage regulator rotating shaft (1201) close to the voltage regulator slotted barrel (1206) is sleeved with a deep groove ball bearing a (1204) and a deep groove ball bearing b (1206) on its outer wall. 05), the outer walls of the deep groove ball bearing a (1204) and the deep groove ball bearing b (1205) are in contact with the inner wall of one end of the voltage regulator slotted cylinder (1206) close to the voltage regulator rotating shaft (1201), the end of the voltage regulator slotted cylinder (1206) close to the voltage regulator rotating shaft (1201) is clamped with a voltage regulator fixing ring (1203), and the voltage regulator lead screw (1202) is away from the voltage regulator rotating shaft (1201) One end of the micro-pressure pump piston (1210) is fixedly connected to the micro-pressure pump piston (1210), the outer wall of the micro-pressure pump piston (1210) is provided with a micro-pressure pump cylinder (1211), the voltage regulator slotted cylinder (1206) is connected to the micro-pressure pump cylinder (1211) via a connecting sleeve (1209), and the end of the micro-pressure pump cylinder (1211) away from the voltage regulator lead screw (1202) is provided with a voltage regulator rear cover (1212), and the voltage regulator rear cover (1212) is respectively connected to the micro-pressure pump cylinder (1211) by four A pipeline is connected to the filter (6), the negative pressure valve (11), the pressure relief valve (13) and the four-way joint; a slide groove is horizontally provided on the voltage regulator slotted cylinder (1206) along the axial direction; a voltage regulator lead screw step groove is vertically provided on the voltage regulator lead screw (1202); a voltage regulator limit slip ring (1207) is provided in the voltage regulator lead screw step groove; and a voltage regulator limit lever (1208) is provided in the voltage regulator limit slip ring (1207).

8. The positive and negative pressure integrated gas piston pressure gauge according to claim 7, characterized in that: A pressure ring (1213) is sleeved on the outer wall of the voltage regulator rotating shaft (1201); the pressure ring (1213) is arranged between the voltage regulator fixing ring (1203) and the deep groove ball bearing a (1204); the outer wall of the pressure ring (1213) is in contact with the voltage regulator slotted cylinder (1206); the pressure ring (1213) is used to fix the deep groove ball bearing a (1204); a voltage regulator slotted cylinder clamping ring is provided at one end of the voltage regulator slotted cylinder (1206) close to the voltage regulator rotating shaft (1201); the voltage regulator fixing ring (1203) is clamped on the voltage regulator slotted cylinder clamping ring.

9. The positive and negative pressure integrated gas piston pressure gauge according to claim 7, characterized in that: A plurality of O-rings e (1214) are sleeved in the sealing groove of the micro-pressure pump piston (1210), and the plurality of O-rings e (1214) are arranged between the micro-pressure pump piston (1210) and the micro-pressure pump cylinder (1211); a plurality of O-rings f (1215) are sleeved in the sealing groove of the outer wall of the pressure regulator rear cover (1212), and the plurality of O-rings f (1215) are arranged between the pressure regulator rear cover (1212) and the micro-pressure pump cylinder (1211); and an O-ring g (1216) is arranged between the pressure regulator slotted cylinder (1206) and the connecting sleeve (1209).

10. The positive and negative pressure integrated gas piston pressure gauge according to claim 7, characterized in that: A connection groove is provided at one end of the voltage regulator lead screw (1202) close to the micro-pressure pump cylinder (1211), and a groove is provided on the micro-pressure pump piston (1210). The voltage regulator lead screw (1202) is fixedly connected to the micro-pressure pump piston (1210) via the connection groove and the groove.

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