A high-pressure twin-screw pump body pressure test tool and a high-pressure twin-screw pump static pressure test method

Abstract

The present invention provides a high-pressure twin-screw pump body pressurization tooling and a high-pressure twin-screw pump static pressure test method. The high-pressure twin-screw pump body pressurization tooling includes two flange plates, isolators with two ends respectively abutting against the two flange plates, and a sealing assembly sleeved on the isolators; wherein the sealing assembly is located on the inner side of the two support rings and abuts against the two support rings, isolating the cavity in the pump body into a high-pressure cavity and a low-pressure cavity. The high-pressure twin-screw pump static pressure test method includes removing the bearing seat, the rotor and the bushing; installing the high-pressure twin-screw pump body pressurization tooling on the pump body; respectively pressure conveying different cavities in the pump body, and observing whether the pump body leaks. The high-pressure twin-screw pump body pressurization tooling and the high-pressure twin-screw pump static pressure test method provided by the present invention reduce the total energy consumed by the test by separating the cavities in the pump body and performing static pressure tests separately, and can more accurately judge the actual working capacity of the low-pressure area in the pump body.

Description

Technical Field

[0001] The invention belongs to the field of twin-screw pump performance testing, and more specifically, relates to a high-pressure twin-screw pump body pressurization tooling and a high-pressure twin-screw pump static pressure testing method. Background Art

[0002] A twin-screw pump is a device used to transport media. Currently, the working pressure limit of the commonly used twin-screw pumps on the market is less than 5.0Mpa. As the application scope of twin-screw pumps becomes more and more extensive, the performance requirements of twin-screw pumps required by the market are getting higher and higher.

[0003] Since the pump body of the twin-screw pump is used in a high-pressure working environment for a long time, if the load-bearing capacity cannot meet the working pressure in the high-pressure environment, it will cause damage to the pump body and affect the operation of the pump body. Therefore, when preparing the twin-screw pump, in order to ensure the quality of the pump body, it is necessary to perform a static pressure test to detect the load-bearing capacity of the pump body.

[0004] Specifically, Figure 1 As shown, when the pump body 100 is subjected to a static pressure test, the first step is to remove the bearing seats 400 connected on both sides of the pump body 100, take out the rotor 300 from the pump body 100, and remove the bushing 200 from the support ring 500 (the bushing 200 and the support ring 500 are clearance-matched, and the support ring 500 is provided with an O-ring that presses against the bushing 200); the second step is to block the openings on both sides of the pump body 100 with metal plates, and apply pressure to the inside of the pump body 100 with a pressure tool. In addition, according to relevant industry standards, when the pump body is subjected to a static pressure test to detect the bearing capacity, the pressure applied should not be less than 1.5 times the rated working pressure. The maximum working pressure of the high-pressure twin-screw pump in existing products is 10Mpa, that is, each position in the pump body needs to withstand a pressure of 15Mpa.

[0005] The inventor discovered that according to the working principle of the pump body, that is, the medium is transmitted from the low-pressure area to the high-pressure area after entering the pump body, the actual working pressure of each part of the pump body is different, especially the actual working pressure at the pump body inlet of the high-pressure twin-screw pump is often no more than 0.5Mpa, so only 0.75Mpa of pressure is applied here to achieve the static pressure test at the pump body inlet. When a pressure of 15Mpa is applied to the inlet, not only the test energy consumption is increased, but also if a pressure leak occurs at the inlet, since the pressure carried by the pump body inlet at this time is much greater than 1.5 times the actual working pressure, the staff can only draw the conclusion that "the pump body inlet cannot bear the high pressure", but cannot draw the conclusion that "the pump body inlet cannot bear the actual working pressure, and this pump body is unqualified", making the static pressure test result of the pump body inaccurate.

[0006] In summary, the pump body static pressure test method in the prior art will apply an equal amount of pressure to the entire pump body, and cannot accurately determine whether the pump body inlet can withstand the actual working pressure, that is, it cannot determine the actual working capacity of the low-pressure area of ​​the pump body, and wastes a lot of energy created by the pressure tool in vain. Summary of the invention

[0007] The purpose of the present invention is to provide a high-pressure twin-screw pump body pressure testing tool and a high-pressure twin-screw pump static pressure testing method, aiming to solve the problem in the prior art that when performing a static pressure test on the pump body, since each part is subjected to equal pressure, it is impossible to accurately judge whether the actual working capacity of the low-pressure area inside the pump body meets the standard.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a high-pressure twin-screw pump body pressurization tooling, comprising:

[0009] Two flange plates, used for being respectively installed on both sides of the pump body and sealing the openings on both sides of the pump body;

[0010] A spacer, which is used to be arranged in the pump body, with two ends thereof respectively abutting against the two flange plates; and

[0011] A sealing assembly, fixedly sleeved on the outer peripheral wall of the isolating member, the sealing assembly is located on the inner side of two support rings arranged in the pump body and is used to abut against the two support rings;

[0012] Wherein, the sealing assembly, the support ring, the inner wall of the pump body and the outer wall of the isolation member form a high-pressure chamber for connecting to the outlet of the pump body; the sealing assembly, the support ring, the flange plate, the inner wall of the pump body and the outer wall of the isolation member form a low-pressure chamber for connecting to the inlet of the pump body.

[0013] As another embodiment of the present application, the isolation member is a cylindrical structure which is hollow inside and open at both ends, and the open end of the isolation member abuts against the flange plate.

[0014] As another embodiment of the present application, the isolation member is provided with a through hole for communicating with the low-pressure chamber.

[0015] As another embodiment of the present application, the sealing assembly includes:

[0016] A first sealing ring, sleeved on the isolating member and located on the inner side of one of the support rings, for abutting against the inner surface of the support ring facing the pump body;

[0017] The second sealing ring is sleeved on the isolating member and is located on the inner side of the other supporting ring, and is used for abutting against the inner surface of the supporting ring facing the pump body.

[0018] As another embodiment of the present application, the first sealing ring and the second sealing ring are both loosely matched with the support ring, and the first sealing ring and the second sealing ring are both provided with sealing grooves for inserting the O-rings of the support rings.

[0019] As another embodiment of the present application, both ends of the isolation member are detachably connected with a hoisting assembly for connecting to an overhead travelling crane.

[0020] As another embodiment of the present application, the hoisting assembly includes:

[0021] Two lifting rings, detachably connected to the end surface of one end of the isolation member;

[0022] The two ends of the hoisting rope are respectively connected to the hoisting rings and are used to be connected to the hook of the overhead travelling crane.

[0023] As another embodiment of the present application, a plurality of thread grooves are arranged on both end surfaces of the isolation member along its circumference, and each of the lifting rings is integrally connected with a connecting column for threaded connection in the thread groove.

[0024] The beneficial effects of the high-pressure twin-screw pump body pressurization tooling provided by the present invention are:

[0025] The steps to use are as follows:

[0026] First, one of the flange plates is fixedly installed at an opening on one side of the pump body; then, the isolator is inserted into the pump body so that the sealing assembly is connected to the two support rings respectively, and one end of the isolator is pressed against the plate surface of the aforementioned flange plate; finally, the other flange plate is fixedly installed at the opening on the other side of the pump body so that the plate surface of the flange plate is pressed against the other end of the isolator.

[0027] The present invention provides a high-pressure twin-screw pump body pressing tool, which blocks the openings on both sides of the pump body by arranging flange plates on both sides of the pump body, so that the inside of the pump body reaches a sealed state (when the inside of the pump body reaches a sealed state, the remaining openings of the pump body are closed by blind plates / switch components connected to the openings, for example, the sewage outlet is blocked by a valve connected to the sewage outlet, etc., which belongs to the prior art); it is connected to two support rings through a sealing assembly, so that the cavity between the inner wall of the pump body and the outer wall of the isolation member is divided into three parts along the axial direction of the isolation member: a low-pressure cavity connected to the pump body inlet, a high-pressure cavity connected to the pump body outlet, and another low-pressure cavity connected to the pump body inlet.

[0028] Compared with the existing technology, by dividing the inner part of the pump body into three different areas and performing static pressure tests of different pressures on the three areas (low-pressure load-bearing test on the low-pressure chamber, and high-pressure load-bearing test on the high-pressure chamber), the overall energy consumption of the test can be reduced; and, it can avoid the situation where leakage occurs due to the bearing pressure of the low-pressure area being greater than 1.5 times the actual working pressure during the test, which makes it impossible for the test personnel to correctly judge the actual working capacity of the low-pressure area. This allows the bearing capacity of the low-pressure area in the pump body to be judged more accurately.

[0029] The present invention also provides a high-pressure twin-screw pump static pressure test method, comprising the following steps:

[0030] A. Remove the bearing seat of the pump body, take out the rotor from the pump body, and remove the bushing from the support ring;

[0031] B. Installing a high-pressure twin-screw pump body pressurization tool as described in any one of the above items on the pump body, separating the cavity in the pump body into the low-pressure cavity and the high-pressure cavity;

[0032] C. Connecting the pressure delivery end of the low-pressure loading device into the low-pressure chamber and applying pressure;

[0033] D. Close the low-pressure loading device and observe whether the pump body leaks;

[0034] E. Connecting the pressure delivery end of the high-pressure loading device into the high-pressure chamber and applying pressure;

[0035] F. Turn off the high-pressure loading device and observe whether the pump body leaks.

[0036] The beneficial effects of the high-pressure twin-screw pump static pressure test method provided by the present invention are the same as the beneficial effects of the aforementioned high-pressure twin-screw pump body pressurization tooling, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a front cross-sectional view of a high-pressure and heavy-load twin-screw pump in the prior art;

[0038] Figure 2 A schematic diagram of the connection relationship between a pump body pressurization tooling and a pump body of a high-pressure twin-screw pump provided in an embodiment of the present invention;

[0039] Figure 3 A structural cross-sectional view of an isolation member used in an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the connection relationship between the isolation member and the overhead travelling crane used in the embodiment of the present invention;

[0041] Figure 5 for Figure 4A partial enlarged view of the upper circle A;

[0042] Figure 6 The figure is a schematic diagram of the connection relationship between the flange plate and the pump body used in the embodiment of the present invention.

[0043] In the figure, 1, flange plate; 2, isolation piece; 21, through hole; 22, threaded groove; 31, first sealing ring; 32, second sealing ring; 33, sealing groove; 41, lifting ring; 411, connecting column; 42, lifting rope; 100, pump body; 110, high-pressure chamber; 120, low-pressure chamber; 200, bushing; 300, rotor; 400, bearing seat; 500, support ring; 510, O-ring. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] Please also read Figures 2 to 6 Now, a high-pressure twin-screw pump body pressurization tool provided by the present invention is described. The high-pressure twin-screw pump body pressurization tool comprises a flange plate 1, an isolator 2 and a sealing assembly.

[0046] Two flange plates 1 are provided, which are respectively used to be installed on both sides of the pump body 100 and to block the openings on both sides of the pump body 100; it should be noted that the openings on both sides of the pump body 100 refer to the openings on the pump body 100 used to connect with the bearing seat 400. For the sake of ease of description, in this embodiment, the openings on both sides of the pump body 100 are referred to as side openings of the pump body 100.

[0047] The isolator 2 is used to be arranged in the pump body 100, and its two ends are respectively abutted against the two flange plates 1; specifically, one of the flange plates 1 is installed in one of the side openings of the pump body 100, and then the isolator 2 is inserted into the pump body 100 along the other side opening of the pump body 100, and the end of the isolator 2 is tightly abutted against the aforementioned flange plate 1, and then another flange plate 1 is installed in the other side opening of the pump body 100, and the flange plate 1 is tightly abutted against the other end of the isolator 2, so as to achieve the effect that the two ends of the isolator 2 are respectively connected to the plate surfaces of the two flange plates 1; and the two flange plates 1, the inner wall of the pump body 100 and the outer wall of the isolator 2 form an annular cavity, which we call the pump inner cavity for the convenience of description.

[0048] The sealing assembly is arranged on the outer peripheral wall of the isolation member 2, located on the inner side of the support ring 500, and is used to be connected to the two support rings 500 in the pump body 100, and the two support rings 500 and the sealing assembly divide the aforementioned pump inner cavity into three parts, along the axial direction of the isolation member 2, which are a low-pressure chamber 120 connected to the inlet of the pump body 100, a high-pressure chamber 110 connected to the outlet of the pump body 100, and another low-pressure chamber 120 connected to the inlet of the pump body 100. Specifically, the sealing assembly, the support ring 500, the inner wall of the pump body 100 and the outer wall of the isolation member 2 form a high-pressure chamber 110 for connecting to the outlet of the pump body 100; the sealing assembly, the support ring 500, the flange plate 1, the inner wall of the pump body 100 and the outer wall of the isolation member 2 form a low-pressure chamber 120 for connecting to the inlet of the pump body 100, two parts of the low-pressure chamber 120 are respectively located on both sides of the high-pressure chamber 110, and the low-pressure chamber 120 parts on both sides are connected through the part of the low-pressure chamber 120 connected to the inlet of the pump body 100.

[0049] By adopting the above technical solution, when the pump body 100 is subjected to a static pressure test, pressure can be applied to the aforementioned high-pressure chamber 110 and low-pressure chamber 120 respectively; specifically, a pressure of 1.5 times the actual working pressure of the high-pressure area in the pump body 100 is applied to the high-pressure chamber 110, and a pressure of 1.5 times the actual working pressure of the low-pressure area in the pump body 100 is applied to the low-pressure area.

[0050] Compared with the prior art, the high-pressure twin-screw pump body pressurization tool provided by the present invention can separate the high-pressure area and the low-pressure area in the pump body 100, and apply pressure to each of them when performing a static pressure test on the pump body 100. On the one hand, it reduces the pressure consumption during the static pressure test on the pump body 100 and reduces energy loss; on the other hand, it avoids the situation that when the pump body 100 is subjected to a static pressure test in a traditional way, even if the low-pressure area of ​​the pump body 100 is damaged, it is impossible to accurately draw a conclusion on whether the pump body 100 can be used in actual work. The high-pressure twin-screw pump body pressurization tool provided by the present invention isolates the low-pressure area in the pump body 100, so that the result obtained after the static pressure test is more reliable, and the carrying capacity of the low-pressure area in the pump body 100 can be judged more accurately.

[0051] Please also read Figure 2 and Figure 3 As a specific implementation of a high-pressure twin-screw pump body pressurizing tooling provided by the present invention, the isolation member 2 is a cylindrical structure with a hollow interior and openings at both ends, wherein the two open ends of the isolation member 2 are respectively abutted against the flange plates 1 on both sides.

[0052] By adopting the above technical solution, the weight of the isolation member 2 can be reduced, making the isolation member 2 easier to install and reducing the materials required for preparing the isolation member 2, which is beneficial to market promotion and use.

[0053] Please also read Figure 2 and Figure 3 As a specific embodiment of a high-pressure twin-screw pump body pressurization tooling provided by the present invention, the isolation member 2 is provided with a through hole 21 for communicating with the low-pressure chamber 120. Specifically, the through hole 21 is opened on the isolation member 2 in the area of ​​the low-pressure chamber 120.

[0054] By adopting the above-mentioned technical scheme, when the low-pressure chamber 120 is subjected to a static pressure test, the pressure medium (generally liquid or gas) of the pressure loading device can pass through the through hole 21 and enter the isolation member 2, so that the entire low-pressure area of ​​the pump body 100 is subjected to low pressure, thereby achieving the effect of completely simulating the actual working state of the pump body 100, thereby improving the reliability of the results of the static pressure test on the low-pressure area in the pump body 100.

[0055] Please also read Figures 2 to 4 As a specific implementation of a high-pressure twin-screw pump body pressurizing tooling provided by the present invention, the sealing assembly includes a first sealing ring 31 and a second sealing ring 32; wherein the first sealing ring 31 and the second sealing ring 32 are both fixedly sleeved on the isolation member 2, and are located one-to-one on the inner side of each support ring 500; the first sealing ring 31 is used to be connected to one of the support rings 500, and the second sealing ring 32 is used to be connected to the other support ring 500.

[0056] When preparing the sealing assembly, the sizes of the first sealing ring 31 and the second sealing ring 32 are determined according to the sizes of the two support rings 500 in the pump body 100. During the installation of the isolator 2, if the two support rings 500 are of different sizes, the sizes of the first sealing ring 31 and the second sealing ring 32 are also different; assuming that the second sealing ring 32 is smaller than the first sealing ring 31, when inserting the isolator 2, the end of the isolator 2 close to the second sealing ring 32 is generally inserted into the pump body 100 to avoid the first sealing ring 31 being stuck on the smaller support ring 500, making the isolator 2 easier to install.

[0057] By adopting the above technical solution, after the isolating member 2 is inserted into the pump body 100 , the first sealing ring 31 and the second sealing ring 32 are respectively connected to the two supporting rings 500 , thereby isolating the inner cavity of the pump into a high-pressure cavity 110 and a low-pressure cavity 120 .

[0058] It should be supplemented that the size relationship between the first sealing ring 31 and the second sealing ring 32 refers to their heights extending along the radial direction of the isolation member 2 .

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. That is, the first sealing ring 31 and the second sealing ring 32 specifically refer to two ring bodies that are sleeved on the isolation member 2 along the axial direction of the isolation member 2.

[0060] Please also read Figures 2 to 4 As a specific implementation of a high-pressure twin-screw pump body pressurizing tooling provided by the present invention, the first sealing ring 31 and the second sealing ring 32 are both gap-matched with the support ring 500, and the first sealing ring 31 and the second sealing ring 32 are both provided with a sealing groove 33 for inserting the O-ring 510 of the support ring 500.

[0061] By adopting the above technical solution, after the first sealing ring 31 and the second sealing ring 32 are respectively connected to the two support rings 500, the O-ring 510 can be inserted into the sealing groove 33, thereby strengthening the connection relationship between the first sealing ring 31 and the second sealing ring 32 and the two support rings 500, so that the sealing of the high-pressure chamber 110 and the low-pressure chamber 120 is stronger, ensuring that when the high-pressure chamber 110 is tested, the pressure medium will not pass into the low-pressure chamber 120 along the support ring 500 and the first sealing ring 31 / the second sealing ring 32, thereby protecting the low-pressure area in the pump body 100.

[0062] It should be noted that the O-ring 510 in the prior art is made of elastic material, so the O-ring 510 will not extend too much along the radial direction of the support ring 500, causing the O-ring 510 to be stuck with the first sealing ring 31 / the second sealing ring 32, so that the isolation member 2 cannot be inserted into the pump body 100.

[0063] Please also read Figure 4 and Figure 5 As a specific implementation of a high-pressure twin-screw pump body pressurization tooling provided by the present invention, both ends of the isolation member 2 are detachably connected with a hoisting assembly for connecting to a crown block.

[0064] By adopting the above technical solution, when the isolation member 2 is inserted into the pump body 100, the isolation member 2 can be connected to the overhead travelling crane through the lifting assembly, thereby eliminating manpower consumption and avoiding the need to open a hole on the isolation member 2 for the overhead travelling crane's hook to pass through, thereby ensuring the stability of the isolation member 2 in use.

[0065] It should be noted that when installing the isolation member 2 , it is only necessary to install a set of lifting components on the isolation member 2 and then insert it into one end of the pump body 100 .

[0066] Please also read Figure 4 and Figure 5As a specific implementation of a high-pressure twin-screw pump body pressurizing tooling provided by the present invention, the lifting assembly includes two lifting rings 41 detachably connected to the end surface of one end of the isolation member 2 and a lifting rope 42 whose two ends are respectively connected to the lifting rings 41; when the two ends of the lifting rope 42 are respectively connected to the two lifting rings 41, the hook body of the overhead crane can be inserted into the space formed by the lifting ring 41, the lifting rope 42 and the cross-section of the isolation member 2, thereby driving the isolation member 2 to move.

[0067] By adopting the above technical solution, the lifting ring 41 is installed on the end face of the isolation member 2, thereby avoiding the situation where the lifting ring 41 is stuck with the side opening of the pump body 100 or the support ring 500; it is connected to the hook body of the overhead crane through the lifting rope 42, and the two ends of the lifting rope 42 are respectively fixed on both sides of one end face of the isolation member 2, so that the movement of the isolation member 2 is smoother.

[0068] Please also read Figures 4 to 6 As a specific implementation of a high-pressure twin-screw pump body pressurizing tooling provided by the present invention, a plurality of thread grooves 22 are arranged on both end surfaces of the isolation member 2 along its circumference, and each lifting ring 41 is integrally connected with a connecting column 411 for threaded connection in the thread groove 22.

[0069] By adopting the above-mentioned technical scheme, the lifting ring 41, the lifting rope 42 and the end face of the isolation member 2 form a space for inserting the hook body of the overhead crane, and by connecting the two connecting columns 411 into different threaded grooves 22, the orientation of the aforementioned space can be changed; in actual operation, by changing the orientation of the aforementioned space, it is possible to avoid the situation where the isolation member 2 rotates along its own axis after the lifting assembly is connected to the hook body of the overhead crane and the isolation member 2 is lifted, thereby eliminating the waiting time after the isolation member 2 is lifted (the waiting time specifically refers to the time period for the isolation member 2 to rotate along its own axis to remain stationary), making the isolation member 2 easier to install.

[0070] It should be supplemented that the two thread grooves 22 connected to the two connecting columns 411 are symmetrical with respect to the end center of the isolating member 2 ; thus, when the isolating member 2 is lifted by the overhead travelling crane, the isolating member 2 is prevented from tilting as a whole.

[0071] Please also read Figures 2 to 6 The present invention also provides a high-pressure twin-screw pump static pressure test method, comprising the following steps:

[0072] A. Remove the bearing seat 400 of the pump body 100, take out the rotor 300 from the pump body 100, and remove the bushing 200 from the support ring 500;

[0073] B. Install the above-mentioned high-pressure twin-screw pump body pressurization tooling on the pump body 100 to form a high-pressure chamber 110 and a low-pressure chamber 120 in the pump body 100;

[0074] C. Connect the pressure delivery end of the low-pressure loading device into the low-pressure chamber 120 and apply pressure;

[0075] D. Close the low-pressure loading device and observe whether the pump body 100 leaks;

[0076] E. Connect the pressure delivery end of the high-pressure loading device into the high-pressure chamber 110 and apply pressure;

[0077] F. Turn off the high-pressure loading device and observe whether the pump body 100 leaks.

[0078] Among them, the methods of removing the bearing seat 400, the rotor 300 and the bushing 200 in step A are all existing technologies and will not be repeated here.

[0079] In step B, the specific installation steps of installing the above-mentioned high-pressure twin-screw pump body pressurization tooling on the pump body 100 are:

[0080] B1. Install one of the flange plates 1 on one of the side openings of the pump body 100;

[0081] B2. Place the pump body 100 horizontally so that the side of the pump body 100 on which the flange plate 1 is mounted is located at the bottom and the other side opening faces upward;

[0082] B3. Connect the isolator 2 to the crane, and drive the isolator 2 to be inserted into the pump body 100 through the crane, so that one end of the isolator 2 is connected to the aforementioned flange plate 1, and the sealing assembly is connected to the two support rings 500 respectively;

[0083] B4. Install another flange plate 1 on the upward side opening of the pump body 100.

[0084] Among them, if the two support rings 500 are of different sizes; in step B1, the flange plate 1 should be installed on the side opening of the pump body 100 close to the smaller support ring 500; in step B3, when the overhead crane lifts the isolation member 2, if the first sealing ring 31 is larger than the second sealing ring 32, the first sealing ring 31 should be located above the second sealing ring 32; if the first sealing ring 31 is smaller than the second sealing ring 32, the first sealing ring 31 should be located below the second sealing ring 32.

[0085] The low-pressure loading device / high-pressure loading device used to apply pressure in step C and step E can be selected according to the pressure value required for the static pressure test, and the connection position with the high-pressure chamber 110 or the low-pressure chamber 120 can be an opening of the pump body 100, such as: a discharge port connected to the high-pressure chamber 110, or a sewage outlet of the pump body 100 connected to the low-pressure chamber 120.

[0086] The time intervals between step D and step F and step C and step E, respectively, should be greater than 30 minutes, so that the static pressure test results of the high-pressure chamber 110 and the low-pressure chamber 120 are more accurate.

[0087] In step D and step F, the staff mainly observes whether there is leakage at the weld of the pump body 100 and whether the pressure value inside the pump body 100 changes; after step F, the staff determines whether the pump body 100 can be used in actual work according to the results obtained in step D and step F; specifically, if there is leakage at the weld of the pump body 100 and the pressure value inside the pump body 100 changes significantly, the pump body 100 is unqualified; on the contrary, if the weld of the pump body 100 always remains in a sealed state and the pressure inside the pump body remains unchanged, the pump body 100 complies with the relevant regulations in this field and can be used in actual high-pressure working environments.

[0088] The beneficial effects of the high-pressure twin-screw pump static pressure test method provided by the present invention are the same as the beneficial effects of the aforementioned high-pressure twin-screw pump body pressurization tooling, and will not be repeated here.

[0089] Furthermore, since the low-pressure area and the high-pressure area inside the pump body 100 are subjected to static pressure tests respectively and do not interfere with each other, step C and step D can be interchanged with step E and step F, that is, step E and step F can be performed before step C and step D.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-pressure twin-screw pump body pressurization tool, characterized in that: include: Two flange plates, used to be respectively installed on both sides of the pump body and to block the openings on both sides of the pump body, the openings on both sides of the pump body are openings on the pump body used to connect with the bearing seat; A spacer, which is used to be arranged in the pump body, with two ends thereof respectively abutting against the two flange plates; and A sealing assembly, fixedly sleeved on the outer peripheral wall of the isolating member, the sealing assembly is located on the inner side of two support rings arranged in the pump body and is used to abut against the two support rings; The sealing assembly, the support ring, the inner wall of the pump body and the outer wall of the isolating member form a high-pressure chamber connected to the outlet of the pump body; the sealing assembly, the support ring, the flange plate, the inner wall of the pump body and the outer wall of the isolating member form a low-pressure chamber connected to the inlet of the pump body; the isolating member is provided with a through hole for communicating with the low-pressure chamber; The sealing assembly comprises: A first sealing ring, sleeved on the isolating member and located on the inner side of one of the support rings, for abutting against the inner surface of the support ring facing the pump body; A second sealing ring, sleeved on the isolating member and located on the inner side of another of the support rings, for abutting against the inner surface of the support ring facing the pump body; The first sealing ring and the second sealing ring are both loosely matched with the support ring, and the first sealing ring and the second sealing ring are both provided with a sealing groove for inserting the O-ring of the support ring; The sizes of the first sealing ring and the second sealing ring are determined according to the sizes of the two support rings in the pump body. The sizes of the two support rings are different, and the sizes of the first sealing ring and the second sealing ring are also different. The size relationship between the first sealing ring and the second sealing ring refers to their heights extending radially along the isolation member.

2. A high-pressure twin-screw pump body pressurization tool as claimed in claim 1, characterized in that: The isolating member is a cylindrical structure with a hollow interior and openings at both ends, and the opening end of the isolating member abuts against the flange plate.

3. A high-pressure twin-screw pump body pressurization tool as claimed in claim 1, characterized in that: Both ends of the isolation piece are detachably connected with a hoisting assembly for connecting with a crown block.

4. A high-pressure twin-screw pump body pressurization tool as claimed in claim 3, characterized in that: The hoisting assembly comprises: Two lifting rings, detachably connected to the end surface of one end of the isolation member; The two ends of the hoisting rope are respectively connected to the hoisting rings and are used to be connected to the hook of the overhead travelling crane.

5. A high-pressure twin-screw pump body pressurization tool as claimed in claim 4, characterized in that: A plurality of thread grooves are arranged on both end surfaces of the isolating member along the circumferential direction thereof, and a connecting column for threaded connection in the thread groove is integrally connected to each of the lifting rings.

6. A high-pressure twin-screw pump static pressure test method, characterized in that: The following steps are involved: A. Remove the bearing seat of the pump body, take out the rotor from the pump body, and remove the bushing from the support ring; B. Installing a high-pressure twin-screw pump body pressurization tooling according to any one of claims 1 to 5 on the pump body, separating the cavity in the pump body into the low-pressure cavity and the high-pressure cavity; C. Connecting the pressure delivery end of the low-pressure loading device into the low-pressure chamber and applying pressure; D. Close the low-pressure loading device and observe whether the pump body leaks; E. Connecting the pressure delivery end of the high-pressure loading device into the high-pressure chamber and applying pressure; F. Turn off the high-pressure loading device and observe whether the pump body leaks.

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