Clamp for testing gas pressure regulator

Abstract

The utility model discloses a clamp for gas pressure regulator test, which relates to the technical field of gas pressure regulator test equipment and comprises an air cylinder and a clamp support, the air cylinder is fixed on the clamp support, a piston rod of the air cylinder extends along the front-back direction and penetrates through a cylinder body of the air cylinder, and a gas channel penetrates through the piston rod of the air cylinder along the axial direction. The drift diameter of the gas channel is matched with the inlet pipe diameter and the outlet pipe diameter of the tested pressure regulator; the two sets of air cylinders are symmetrically distributed, and a clamping position is formed between the two sets of air cylinders. When the pressure regulator to be tested is placed at the clamping position, the piston rods of the two groups of cylinders can respectively clamp and seal the inlet and the outlet of the pressure regulator to be tested, and the gas channels of the piston rods of the two groups of cylinders can respectively communicate with the inlet and the outlet of the pressure regulator to be tested, so that compressed air is introduced into the pressure regulator to be tested for testing. The gas pressure regulator testing device can meet the testing requirements of the gas pressure regulator, and is simple in structure and convenient to use.

Description

Technical Field

[0001] This utility model relates to the technical field of gas pressure regulator testing equipment, and in particular to a fixture for testing gas pressure regulators. Background Technology

[0002] According to the national standard GB 27790 "Urban Gas Pressure Regulators", each gas pressure regulator should undergo factory inspection after assembly. The inspection items include external seal testing, static characteristic testing (including testing of pressure stabilization accuracy level and shut-off pressure level), and internal seal testing.

[0003] All of the above tests require the injection of compressed air into the pressure regulator under test. Furthermore, the tests should be conducted with the connections of the pressure regulator under test properly sealed. Additionally, during static characteristic testing, the test system must provide a sufficient flow of compressed air to meet the test requirements, and the tests should be performed when the inlet pressure of the pressure regulator under test is stable.

[0004] Currently, the general testing system involves connecting the pressure regulator under test to the pipeline via a flange connection. This method eliminates the need for any tooling or fixtures: a rubber gasket is placed between the pipeline flange and the pressure regulator flange, and the flanges are connected with fasteners. The fasteners are then removed after the test. However, the sealing performance of this method is affected by the operator's skill level, and it is inconvenient to operate and time-consuming to disassemble.

[0005] Some testing systems use pre-made pneumatic or hydraulic cylinders to clamp the pressure regulator under test, but this requires a combination of multiple cylinders. If hydraulic cylinders are used, an additional hydraulic system is needed to provide power. Figures 1-2 As shown, the existing gas pressure regulator test fixture uses two thrust cylinders 01 and four corner clamping cylinders 02, which results in a complex fixture structure and high maintenance costs.

[0006] Furthermore, in some test systems, the inlet air supply line of the pressure regulator under test is too narrow and cannot meet the test flow requirements. During the test, due to the narrow compressed air pipeline, the gas flow rate increases and the pressure loss increases, resulting in large fluctuations in the inlet pressure of the pressure regulator under test. This can easily lead to inaccurate test results and the fixture may not meet the test requirements. Utility Model Content

[0007] The purpose of this utility model is to provide a fixture for testing gas pressure regulators, so as to solve the problems existing in the above-mentioned related technologies, meet the testing requirements of gas pressure regulators, and have a simple structure and are easy to use.

[0008] To achieve the above objectives, this utility model provides the following solution:

[0009] This utility model provides a fixture for testing a gas pressure regulator, including a cylinder and a fixture bracket. The cylinder is fixed on the fixture bracket. The piston rod of the cylinder extends in the front-back direction and passes through the cylinder body. A gas passage passes through the piston rod of the cylinder in the axial direction. The diameter of the gas passage matches the inlet pipe diameter and outlet pipe diameter of the pressure regulator under test.

[0010] The cylinder is provided in two sets, which are symmetrically distributed and form a clamping position between them. When the pressure regulator under test is placed in the clamping position, the piston rods of the two sets of cylinders can clamp and seal the inlet and outlet of the pressure regulator under test respectively, and the gas passages of the piston rods of the two sets of cylinders can be connected to the inlet and outlet of the pressure regulator under test respectively, so as to introduce compressed air into the pressure regulator under test for testing.

[0011] Preferably, a piston assembly is movably disposed within the cylinder body of the cylinder, the piston assembly being able to divide the cylinder body into a front chamber and a rear chamber, and the cylinder body is provided with a front vent and a rear vent, the front vent and the rear vent communicating with the front chamber and the rear chamber respectively, so that the piston assembly can move back and forth;

[0012] The piston rod of the cylinder includes a clamping block, a piston sleeve, and a connecting pipe connected sequentially from front to back. The piston sleeve is movably inserted through the front part of the cylinder body, and the rear end of the piston sleeve is fixedly inserted through the middle part of the piston assembly. The clamping block is fixed to the front end of the piston sleeve and has a hollow structure, communicating with the piston sleeve. The connecting pipe is fixedly inserted through the rear part of the cylinder body, the front end of the connecting pipe is slidably connected inside the piston sleeve, and the rear end of the connecting pipe is used to communicate with a compressed air pipeline.

[0013] Preferably, the front end face of the clamping block is provided with a double annular groove, and two O-rings are installed in the double annular groove.

[0014] Preferably, the clamping block is threadedly connected to the front end of the piston sleeve.

[0015] Preferably, the piston assembly includes a front piston and a rear piston, the front piston and the rear piston are fixedly connected by a first bolt, and a first center hole is provided in the middle of both the front piston and the rear piston;

[0016] A first annular groove is provided between the rear edge of the first central hole of the front piston and the front edge of the first central hole of the rear piston. A first annular flange is provided on the outer wall of the rear end of the piston sleeve. The piston sleeve can be engaged and fixed by the first annular flange and the first annular groove.

[0017] Preferably, the cylinder body includes a cylinder barrel, a front cylinder head, and a rear cylinder head. The cylinder barrel extends in a front-rear direction, and the front cylinder head and the rear cylinder head are respectively sealed to the front and rear sides of the cylinder barrel, and the front cylinder head and the rear cylinder head are fixedly connected by a screw.

[0018] The piston assembly is movably disposed within the cylinder, and the front piston and the front cylinder head form the front chamber, and the rear piston and the rear cylinder head form the rear chamber; the front vent and the rear vent are respectively opened on the front cylinder head and the rear cylinder head;

[0019] The front cylinder head and the rear cylinder head are both provided with a second central hole in the middle. The piston sleeve is movably inserted into the second central hole of the front cylinder head. The rear edge of the second central hole of the rear cylinder head is provided with a second annular groove. The outer wall of the rear end of the connecting pipe is provided with a second annular flange. The connecting pipe can be engaged and limited by the second annular flange and the second annular groove, and is fixedly connected to the rear cylinder head by a fixing plate.

[0020] Preferably, the fixing plate is fixedly connected to the rear end face of the rear cylinder head by a second bolt.

[0021] Preferably, sealing rings are provided between the clamping block and the front end of the piston sleeve, between the piston sleeve and the center hole of the front cylinder head, between the first annular flange and the first annular groove of the piston sleeve, between the front end of the connecting pipe and the piston sleeve, between the second annular flange and the second annular groove of the connecting pipe, between the front piston and the cylinder, between the rear piston and the cylinder, between the front cylinder head and the front side of the cylinder, and between the rear cylinder head and the rear side of the cylinder.

[0022] Preferably, each set of cylinders is fixed to the fixture bracket by a cylinder base; the front end of the cylinder base is provided with a vertical plate, and the vertical plate is provided with a slot; when the pressure regulator under test is placed in the clamping position, the inlet flange and outlet flange of the pressure regulator under test can be respectively engaged in the slots of the cylinder bases of the two sets of cylinders.

[0023] Preferably, the slot is a U-shaped slot.

[0024] This utility model achieves the following technical advantages compared to related technologies:

[0025] The gas pressure regulator testing fixture provided by this utility model includes cylinders and a fixture support. Two sets of cylinders are symmetrically distributed. In use, the pressure regulator to be tested is placed in the clamping position formed between the two sets of cylinders. The piston rods of the two sets of cylinders clamp and seal the inlet and outlet of the pressure regulator to be tested. Simultaneously, since the piston rod of each set of cylinders penetrates the cylinder body of the corresponding cylinder, and each set of cylinders has a gas passage, the gas passages of the piston rods of the two sets of cylinders are connected to the inlet and outlet of the pressure regulator to be tested, respectively. Then, compressed air is introduced into the gas passage near the inlet of the pressure regulator to test the pressure regulator.

[0026] This invention uses symmetrically arranged double cylinders as the clamping power source, which is simple in structure and easy to use. Furthermore, the power source of the cylinders can be the compressed air used in the gas pressure regulator test, which is stable and does not require other power systems. More importantly, this invention designs the center of the cylinder as a hollow structure and makes the diameter of the gas passage equal to the inlet and outlet pipe diameter of the pressure regulator, which ensures the stability of the inlet and outlet pressure of the pressure regulator during the gas pressure regulator test and meets the test requirements of the gas pressure regulator. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a top-view schematic diagram of an existing gas pressure regulator test fixture;

[0029] Figure 2 A schematic diagram of the front view angle of an existing gas pressure regulator test fixture;

[0030] Figures 1-2 In the middle: 01-thrust cylinder, 02-angle clamping cylinder.

[0031] Figure 3 A front view of the gas pressure regulator test fixture provided in an embodiment of this utility model;

[0032] Figure 4 A bottom view of the gas pressure regulator test fixture provided in this embodiment of the utility model;

[0033] Figure 5 A perspective view of the gas pressure regulator test fixture provided for an embodiment of this utility model;

[0034] Figure 6A front view of a set of cylinders and cylinder bases provided in an embodiment of this utility model;

[0035] Figure 7 for Figure 6 Sectional view of AA;

[0036] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0037] Figure 9 A perspective view of a set of cylinders and cylinder bases provided for an embodiment of this utility model.

[0038] Figures 3-9 In the middle: 100-The pressure regulator under test, 1-Cylinder, 101-Gas passage, 102-Front chamber, 103-Rear chamber, 104-Front vent, 105-Rear vent, 106-Clamping block, 107-Piston sleeve, 108-Connecting pipe, 109-O-ring seal, 110-Front piston, 111-Rear piston, 112-First bolt, 113-First annular flange, 114-Cylinder barrel, 115-Front cylinder head, 116-Rear cylinder head, 117-Screw, 118-Second annular flange, 119-Fixing plate, 120-Second bolt, 2-Clamping bracket, 3-Cylinder base, 301-Upright plate. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] The purpose of this utility model is to provide a fixture for testing gas pressure regulators to solve the problems existing in related technologies, meet the testing requirements of gas pressure regulators, and has a simple structure and is easy to use.

[0041] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] like Figures 3-9 As shown, this embodiment provides a fixture for testing a gas pressure regulator, including a cylinder 1 and a fixture bracket 2. The cylinder 1 is fixed on the fixture bracket 2. The piston rod of the cylinder 1 extends in the front-back direction and passes through the cylinder body of the cylinder 1. A gas passage 101 passes through the piston rod of the cylinder 1 axially. The diameter of the gas passage 101 matches the inlet pipe diameter and outlet pipe diameter of the pressure regulator 100 under test.

[0043] In this embodiment, two sets of cylinders 1 are provided, which are symmetrically distributed and form a clamping position between them. When the pressure regulator 100 under test is placed in the clamping position, the piston rods of the two sets of cylinders 1 can clamp and seal the inlet and outlet of the pressure regulator 100 under test respectively, and the gas passages 101 of the piston rods of the two sets of cylinders 1 can be connected to the inlet and outlet of the pressure regulator 100 under test respectively, so as to introduce compressed air into the pressure regulator 100 under test for testing.

[0044] Furthermore, each set of cylinders 1 is fixed to the fixture bracket 2 by a cylinder base 3; the front end of the cylinder base 3 is provided with a vertical plate 301, and the vertical plate 301 is provided with a slot, preferably a U-shaped slot; when the pressure regulator 100 under test is placed in the clamping position, the inlet flange and outlet flange of the pressure regulator 100 under test can be respectively engaged in the U-shaped slots of the cylinder base 3 of the two sets of cylinders 1.

[0045] It should be noted that for any group of cylinders 1, the direction closest to the pressure regulator 100 under test is considered the front, and the direction furthest from the pressure regulator 100 under test is considered the rear.

[0046] In this embodiment, a piston assembly is movably disposed within the cylinder body of cylinder 1. The piston assembly divides the cylinder body of cylinder 1 into a front chamber 102 and a rear chamber 103. A front vent 104 and a rear vent 105 are provided on the cylinder body of cylinder 1, communicating with the front chamber 102 and the rear chamber 103 respectively, allowing the piston assembly to move back and forth. The piston rod of cylinder 1 includes a clamping block 106 and a piston sleeve 107 connected sequentially from front to back. The piston sleeve 107 is movably inserted through the front part of the cylinder body of the cylinder 1, and the rear end of the piston sleeve 107 is fixedly inserted through the middle part of the piston assembly; the clamping block 106 is fixed to the front end of the piston sleeve 107, and the clamping block 106 is a hollow structure and communicates with the piston sleeve 107; the connecting pipe 108 is fixedly inserted through the rear part of the cylinder body of the cylinder 1, the front end of the connecting pipe 108 is slidably connected to the piston sleeve 107, and the rear end of the connecting pipe 108 is used to communicate with the compressed air pipeline.

[0047] In this embodiment, a double annular groove is provided on the front end face of the clamping block 106, and two O-ring seals 109 are installed in the double annular groove; specifically, as shown in the figure Figure 8 As shown, two annular grooves are provided on the front end face of the clamping block 106, and an O-ring 109 of corresponding specification is installed in each annular groove. When the front end face of the clamping block 106 is in contact with the sealing surface of the pressure regulator flange, the O-ring 109 is compressed and plays a sealing role. By adopting a double O-ring structure at the connection between the clamp and the pressure regulator 100 under test, a good sealing effect can be ensured even when the air source pressure of the clamp is low.

[0048] In this embodiment, the clamping block 106 is threadedly connected to the front end of the piston sleeve 107, which makes it convenient for those skilled in the art to replace the clamping block 106 of different sizes according to the specifications of the pressure regulator flange, so as to realize the inspection of pressure regulators of various specifications.

[0049] In this embodiment, the piston assembly includes a front piston 110 and a rear piston 111. The front piston 110 and the rear piston 111 are fixedly connected by a first bolt 112, and a first central hole is provided in the middle of both the front piston 110 and the rear piston 111. A first annular groove is provided between the rear edge of the first central hole of the front piston 110 and the front edge of the first central hole of the rear piston 111. A first annular flange 113 is provided on the outer wall of the rear end of the piston sleeve 107. The piston sleeve 107 can be engaged and fixed by the first annular flange 113 and the first annular groove.

[0050] In this embodiment, the cylinder body of cylinder 1 includes a cylinder barrel 114, a front cylinder head 115, and a rear cylinder head 116. The cylinder barrel 114 extends in the front-rear direction. The front cylinder head 115 and the rear cylinder head 116 are respectively sealed to the front and rear sides of the cylinder barrel 114, and the front cylinder head 115 and the rear cylinder head 116 are fixedly connected by a screw 117. The piston assembly is movably disposed within the cylinder barrel 114, and a front chamber 102 is formed between the front piston 110 and the front cylinder head 115, and a rear chamber 103 is formed between the rear piston 111 and the rear cylinder head 116. A front vent 104 and Rear vents 105 are respectively opened on the front cylinder head 115 and the rear cylinder head 116; a second center hole is opened in the middle of the front cylinder head 115 and the rear cylinder head 116, and the piston sleeve 107 is movably inserted into the second center hole of the front cylinder head 115; a second annular groove is provided at the rear edge of the second center hole of the rear cylinder head 116, and a second annular flange 118 is provided on the outer wall of the rear end of the connecting pipe 108. The connecting pipe 108 can be locked and limited by the second annular flange 118 and the second annular groove, and is fixedly connected to the rear cylinder head 116 by the fixing plate 119.

[0051] In this embodiment, the fixing plate 119 and the rear end face of the rear cylinder head 116 are fixedly connected by the second bolt 120.

[0052] In this embodiment, sealing rings are provided between the clamping block 106 and the front end of the piston sleeve 107, between the piston sleeve 107 and the center hole of the front cylinder head 115, between the first annular flange 113 and the first annular groove of the piston sleeve 107, between the front end of the connecting pipe 108 and the piston sleeve 107, between the second annular flange 118 and the second annular groove of the connecting pipe 108, between the front piston 110 and the cylinder 114, between the rear piston 111 and the cylinder 114, between the front cylinder head 115 and the front side of the cylinder 114, and between the rear cylinder head 116 and the rear side of the cylinder 114, to ensure the overall airtightness of the cylinder 1.

[0053] It should be noted that, as Figure 7 As shown, in this embodiment, the connecting pipe 108 is assembled in the second center hole of the rear cylinder head 116 and fixed with the fixing plate 119 and the second bolt 120. The front piston 110 and the rear piston 111 are fixed to the piston sleeve 107 with the first bolt 112 and placed in the cylinder 114. The front cylinder head 115 and the rear cylinder head 116 are respectively installed on the front and rear sides of the cylinder 114 and connected with the screw 117. The clamping block 106 is threadedly connected to the piston sleeve 107.

[0054] It should be noted that, as Figure 7 As shown, the piston assembly divides the cylinder 114 into a front chamber 102 and a rear chamber 103. When compressed air is injected into the rear chamber 103 through the rear vent 105, the compressed air pushes the piston assembly forward, and the gas in the front chamber 102 is discharged from the front vent 104. The clamping block 106 clamps the pressure regulator 100 under test. When compressed air is injected into the front chamber 102 through the front vent 104, the compressed air pushes the piston assembly backward, and the gas in the rear chamber 103 is discharged from the rear vent 105. The clamping block 106 separates from the pressure regulator 100 under test.

[0055] It should be noted that, as Figure 7 As shown, the connecting pipe 108, piston sleeve 107 and clamping block 106 are all hollow structures. The diameter of the gas channel 101 formed between the three is consistent with the inlet and outlet pipe diameter of the pressure regulator 100 under test. During the gas pressure regulator test, there will be no inlet pressure fluctuation due to the pipe diameter.

[0056] It should be noted that, as Figure 7 As shown, the connecting pipe 108 is fixed on the rear cylinder head and will not move with the piston assembly. It can be connected to the compressed air pipeline by machining threads at the end of the connecting pipe 108, or it can be connected to the compressed air pipeline by welding a flange at the end of the connecting pipe 108. There are various ways to connect to the pipeline, which is convenient for connecting to the pipeline of the test system.

[0057] It should be noted that the implementation steps of the gas pressure regulator testing fixture provided in this embodiment as a physical equipment product are as follows:

[0058] The first step is to produce drawings: determine the dimensions and fits of each part, as well as the form, position and tolerance fits for machining, and produce drawings for machining.

[0059] The second step is the process: determining the machining process for the parts and the assembly process for the voltage regulator.

[0060] The third step is machining: machining the parts according to the drawings.

[0061] The fourth step is assembly: assembling the prototype parts.

[0062] Step 5: Testing: Test the prototypes according to the relevant standards.

[0063] Step 6, Confirmation: Continuously improve performance through testing and refinement, and finally confirm.

[0064] Step 7, Submission for Testing: After confirming the product performance, the sample is sent to an authoritative institution for type testing. A report is obtained after the test is passed.

[0065] Step 8, Trial Production and Trial Sales: After obtaining the type test report from an authoritative institution, conduct small-batch trial production, find pilot sites to test the product, and test and monitor it under the actual working conditions of users, using the actual operating conditions as a basis for further improvement of the product.

[0066] It should be noted that the working principle of the gas pressure regulator test fixture provided in this embodiment is as follows:

[0067] First, the inlet and outlet flanges of the pressure regulator 100 under test are respectively clamped into the U-shaped grooves of the cylinder base 3 of the two sets of cylinders 1, restricting the axial displacement of the pressure regulator 100 under test. Then, compressed air is injected into the rear vent 105 of the two sets of cylinders 1 through the pneumatic control valve. The compressed air pushes the piston assembly of the two sets of cylinders 1 forward until the front end faces of the two clamping blocks 106 are in close contact with the sealing surfaces of the inlet and outlet flanges of the pressure regulator 100 under test, respectively. After clamping is completed, open the inlet valve in the test system and inject compressed air into the pressure regulator 100 under test for various tests. After the tests are completed, close the inlet valve in the test system and open the outlet valve to release the gas in the pressure regulator 100 under test. Then, inject compressed air into the front vent 104 of the two sets of cylinders 1 through the pneumatic control valve. The compressed air pushes the piston assembly to move in the opposite direction, causing the two clamping blocks 106 to separate from the pressure regulator 100 under test. Remove the pressure regulator 100 under test, and the test ends.

[0068] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A gas pressure regulator test fixture, characterized by: The cylinder is fixed on the clamp support, the piston rod of the cylinder extends in the front-rear direction and penetrates the cylinder body, and the gas passage is axially penetrated in the piston rod of the cylinder, and the diameter of the gas passage matches the inlet pipe diameter and the outlet pipe diameter of the measured pressure regulator; The two groups of cylinders are symmetrically distributed, and the clamping position is formed between the two groups of cylinders; when the measured pressure regulator is placed in the clamping position, the piston rods of the two groups of cylinders can clamp and seal the inlet and outlet of the measured pressure regulator respectively, and the gas passages of the piston rods of the two groups of cylinders can communicate with the inlet and outlet of the measured pressure regulator respectively to introduce compressed air into the measured pressure regulator for testing.

2. The gas pressure regulator test fixture of claim 1, wherein: A piston assembly is movably arranged in the cylinder body, the piston assembly can separate the cylinder body into a front chamber and a rear chamber, and a front air hole and a rear air hole are arranged on the cylinder body, the front air hole and the rear air hole respectively communicate with the front chamber and the rear chamber, so that the piston assembly can move forward and backward; The piston rod of the cylinder includes a clamping block, a piston sleeve and a connecting pipe connected in sequence from front to back, the piston sleeve is movably arranged in the front part of the cylinder body, and the rear end of the piston sleeve is fixedly arranged in the middle part of the piston assembly; the clamping block is fixed to the front end of the piston sleeve, and the clamping block is a hollow structure and communicates with the piston sleeve; the connecting pipe is fixedly arranged in the rear part of the cylinder body, the front end of the connecting pipe is slidably connected in the piston sleeve, and the rear end of the connecting pipe is used for communicating with the compressed air pipeline.

3. The gas pressure regulator test fixture of claim 2, wherein: A double-ring groove is arranged on the front end face of the clamping block, and two O-shaped sealing rings are installed in the double-ring groove.

4. The gas pressure regulator test fixture of claim 2, wherein: The front end of the clamping block is threadedly connected with the front end of the piston sleeve.

5. The gas pressure regulator test fixture of claim 2, wherein: The piston assembly includes a front piston and a rear piston, the front piston and the rear piston are fixedly connected by a first bolt, and first center holes are formed in the middle parts of the front piston and the rear piston; A first annular groove is arranged between the rear edge of the first center hole of the front piston and the front edge of the first center hole of the rear piston, a first annular flange is arranged on the rear end outer wall of the piston sleeve, and the piston sleeve can be clamped and fixed with the first annular groove through the first annular flange.

6. The gas pressure regulator test fixture of claim 5, wherein: The cylinder body includes a cylinder barrel, a front cylinder cover and a rear cylinder cover, the cylinder barrel extends in the front-rear direction, the front cylinder cover and the rear cylinder cover are respectively sealed on the front side and the rear side of the cylinder barrel, and the front cylinder cover and the rear cylinder cover are fixedly connected by a screw rod; The piston assembly is movably arranged in the cylinder barrel, the front chamber is formed between the front piston and the front cylinder cover, and the rear chamber is formed between the rear piston and the rear cylinder cover; the front air hole and the rear air hole are respectively formed in the front cylinder cover and the rear cylinder cover. The middle part of the front cylinder cover and the rear cylinder cover is provided with a second center hole, and the piston sleeve is movably arranged in the second center hole of the front cylinder cover; the rear edge of the second center hole of the rear cylinder cover is provided with a second annular groove, and the outer wall of the rear end of the connecting pipe is provided with a second annular flange, the connecting pipe is limited and positioned by the second annular flange and the second annular groove, and the connecting pipe is fixedly connected with the rear cylinder cover through the fixing plate.

7. A gas pressure regulator test fixture according to claim 6, wherein: The fixing plate and the rear end surface of the rear cylinder cover are fixedly connected through a second bolt.

8. The gas pressure regulator test fixture of claim 6, wherein: Sealing rings are arranged between the clamping block and the front end of the piston sleeve, between the piston sleeve and the center hole of the front cylinder cover, between the first annular flange of the piston sleeve and the first annular groove, between the front end of the connecting pipe and the piston sleeve, between the second annular flange of the connecting pipe and the second annular groove, between the front piston and the cylinder barrel, between the rear piston and the cylinder barrel, between the front cylinder cover and the front side of the cylinder barrel, and between the rear cylinder cover and the rear side of the cylinder barrel.

9. The gas pressure regulator test fixture of claim 1, wherein: Each group of the air cylinders is fixed to the clamp support through an air cylinder base; the front end of the air cylinder base is provided with a vertical plate, and the vertical plate is provided with a clamping groove; when the measured pressure regulator is placed in the clamping position, the inlet flange and the outlet flange of the measured pressure regulator can be clamped in the clamping grooves of the air cylinder bases of the two groups of air cylinders respectively.

10. The gas pressure regulator test fixture of claim 9, wherein: The clamping groove is a U-shaped groove.

Images