Impact turbine spray needle and wear ring pressure test tool and assembly and test method

Abstract

The invention belongs to the technical field of nozzles, and particularly relates to an impulse turbine spray needle and wear ring pressure test tool and an assembly and test method. According to the technical scheme, the impulse turbine spray needle and wear ring pressure test tool comprises a test cover and a test shaft which are connected with each other, the test cover and the test shaft are positioned through a spigot, the spray needle and the test shaft are positioned through a spigot, and one end, away from the test shaft, of the test cover is connected with a test compression ring. The wear ring and the test cover are compressed by the test compression ring after being positioned through a spigot, and the spray needle is contacted with the conical surface of the wear ring; the test shaft is provided with a pressing hole, and a closed cavity composed of the test cover, the test shaft, the spray needle and the wear ring is filled with water through the pressing hole for pressing. According to the impulse turbine spray needle and wear ring pressure test tool and the assembly and test method, the spray needle and wear ring machining quality detection method is simple and easy to operate, and the test result is accurate and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of nozzles, and in particular relates to an impulse turbine nozzle needle, a mouth ring pressure test tool and an assembly and test method. Background Art

[0002] Currently, the method for verifying the effectiveness of the needle and ring machining and surface quality in sealing water is to place the needle flat with the cone tip facing upward, hoist the ring onto the needle, adjust the clearance and coaxiality between the two components, and then add water above the sealing surface to observe for leaks below. This method has the following problems: difficulty adjusting the relative position of the two components, low water pressure, and the tendency to leak, making it difficult to determine machining quality. Summary of the Invention

[0003] In order to solve the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a pressure test tool and assembly and testing method for the injection needle and mouth ring of an impulse turbine, so that the injection needle and mouth ring processing quality inspection method is simple and easy to operate, and the test results are accurate and reliable.

[0004] The technical solution adopted in the present invention is: A tool for testing the pressure of an impulse turbine needle and a mouth ring comprises a test cover and a test shaft which are connected to each other. The test cover and the test shaft are positioned by a stopper, the needle and the test shaft are positioned by a stopper, a test pressure ring is connected to the end of the test cover away from the test shaft, the mouth ring and the test cover are positioned by the stopper and then pressed tightly by the test pressure ring, and the needle and the mouth ring are in contact with each other on the conical surface; a pressure hole is provided on the test shaft, and water is filled into a closed cavity composed of the test cover, the test shaft, the needle and the mouth ring through the pressure hole to perform pressure testing.

[0005] In this invention, the needle is positioned by the stopper of the test shaft, the ring is positioned by the stopper of the test cover, and then tightened with the test pressure ring. Once the test cover and test shaft are positioned by the stopper and bolted together, the needle and ring maintain a precise assembly relationship. Installing the needle and ring via the test cover, test shaft, and test pressure ring eliminates the need for repeated adjustment of clearance and coaxiality between the two components, enabling quick installation.

[0006] After the test cover and test shaft are bolted together, the sealed chamber formed by the test cover, test shaft, spray needle, and mouth ring can be filled with water for pressure testing. This chamber can withstand a certain pressure without worrying about leakage caused by damage to the needle and mouth ring. Through the pressure test, the present invention can accurately determine the processing quality of the spray needle and mouth ring.

[0007] As a preferred embodiment of the present invention, the test shaft comprises a connecting plate and a column disposed in the middle of the connecting plate. The pressure injection hole is provided on the connecting plate, the spray needle is positioned with the main body via a stopper, and the test cover is connected to the connecting plate and positioned via the stopper. By dividing the test shaft into two parts, the connecting plate and the column, the test cover, connecting plate, column, spray needle, and mouth ring can form a sufficiently large annular sealed cavity, facilitating water pressure testing.

[0008] As a preferred solution of the present invention, the connecting plate is further provided with an air exhaust hole for exhausting the air in the sealed cavity.

[0009] As a preferred embodiment of the present invention, a rib plate is provided on the column for limiting the position of the spray needle. After the test shaft is in place, the spray needle is hoisted onto the test shaft, and the spray needle contacts the rib plate to ensure that the spray needle and the test shaft are concentric.

[0010] As a preferred solution of the present invention, sealing rings are provided between the test cover and the test shaft, between the test cover and the mouth ring, and between the test shaft and the spray needle to prevent leakage.

[0011] As a preferred embodiment of the present invention, a buttress is further included, and the assembled test shaft, test cover, test pressure ring, spray needle and mouth ring are turned over as a whole and placed on the buttress, with the tip of the spray needle facing downward.

[0012] As a preferred embodiment of the present invention, before the assembled test shaft, test cover, test pressure ring, spray needle, and mouth ring are turned over, a gap exists between the spray needle and the mouth ring, and copper foil is inserted into this gap. The test cover, mouth ring, and test pressure ring assembly module is hoisted onto the test shaft and spray needle assembly module. A small amount of copper foil is inserted into this gap to prevent the spray needle from shaking during the turnaround. After the turnaround, the entire assembly is placed on a support pier, and the spray needle is lifted up with a jack, and the copper foil is removed.

[0013] As a preferred solution of the present invention, the inner wall of the test cover is provided with a tapered surface that smoothly transitions with the inner wall of the mouth ring.

[0014] A method for assembling a nozzle needle and a pressure tool for an impulse turbine comprises the following steps: S1: The test shaft is in place, and the spray needle is hoisted onto the test shaft. At this time, the spray needle contacts the test shaft rib to ensure that the spray needle and the test shaft are concentric; S2: Assemble the test cover, mouth ring and test pressure ring; S3: Hoist the test cover, mouth ring, and test pressure ring assembly module onto the test shaft and nozzle assembly module. At this point, there is a gap between the nozzle and the mouth ring. A small amount of copper foil is inserted into the gap to prevent the nozzle from shaking when the whole unit is turned over. S4: After turning over the whole assembly, place it on the pier, lift the spray needle with a jack, take out the copper sheet, and slowly lower the jack. The spray needle will automatically fall down with the jack, and after contacting the conical surface of the nozzle ring, remove the jack. Measure the gap between the spray needle and the nozzle ring. The feeler gauge cannot enter at 0.02mm and the sealing part is opaque. Assembly is complete.

[0015] A method for testing the pressure of a nozzle needle and a mouth ring of an impulse turbine comprises the following steps: Y1: Carry out a pressure test according to the corresponding pressure test diagram. During the pressure test, increase the pressure by 2 MPa every 5 minutes, and maintain the pressure for 10 minutes every time the pressure increases by 2 MPa until the required pressure value is reached. After maintaining the pressure for 30 minutes, gradually reduce the pressure according to the pressure increase steps. Observe whether there is water leakage under the sealing surface of the nozzle needle and the mouth ring during the test; Y2: After the test is completed, dismantle the test tool, clean the spray needle and mouth ring, and perform 100% fluorescent penetrant testing on the sealing parts of the spray needle and mouth ring to determine whether there are any defects in the spray needle and mouth ring.

[0016] The beneficial effects of the present invention are: 1. In this invention, the spray needle is positioned by the stopper on the test shaft, the ring is positioned by the stopper on the test cover, and then tightened with a test pressure ring. Once the test cover and test shaft are positioned by the stopper and bolted together, the spray needle and ring maintain a precise assembly relationship. Installing the spray needle and ring via the test cover, test shaft, and test pressure ring eliminates the need for repeated adjustment of clearance and coaxiality between the two components, enabling quick installation.

[0017] 2. After the test cover and test shaft are bolted together, the sealed chamber formed by the test cover, test shaft, spray needle, and mouth ring can be filled with water for pressure testing. This chamber can withstand a certain pressure without worrying about leakage caused by damage to the needle and mouth ring. This pressure test accurately determines the processing quality of the spray needle and mouth ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is the assembly drawing of the test shaft and the nozzle needle; Figure 3 This is the assembly drawing of the test cover, mouth ring and test pressure ring; Figure 4 It is an assembly diagram of the present invention when it is inverted; Figure 5 It is a structural diagram of the test shaft; Figure 6 It is a structural diagram of the test cover; Figure 7 It is a structural diagram of the test pressure ring.

[0019] In the figure: 1-test cover; 2-test shaft; 3-test pressure ring; 4-buttress; 5-bolt; 6-screw; 7-sealing ring; 8-spray needle; 9-mouth ring; 11-conical surface; 21-connecting plate; 22-column; 23-pressing hole; 24-exhaust hole; 25-rib plate; 26-screw plug. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.

[0022] like Figure 1 、 Figures 5 to 7 As shown, a pressure test tool for a pulse turbine needle and mouth ring of this embodiment includes a test cover 1 and a test shaft 2 connected by bolts 5, the test cover 1 and the test shaft 2 are positioned by a stopper, the needle 8 and the test shaft 2 are positioned by a stopper, and the end of the test cover 1 away from the test shaft 2 is connected to a test pressure ring 3 by a screw 6, and the mouth ring 9 is pressed tightly with the test pressure ring 3 after being positioned with the test cover 1 by the stopper, and the conical surfaces of the needle 8 and the mouth ring 9 are in contact; a pressure hole 23 is opened on the test shaft 2, and water is filled into the closed cavity composed of the test cover 1, the test shaft 2, the needle 8, and the mouth ring 9 through the pressure hole 23 to perform pressure testing.

[0023] In the present invention, the spray needle 8 is positioned by the stopper of the test shaft 2, the ring 9 is positioned by the stopper of the test cover 1, and then tightened with the test pressure ring 3. After the test cover 1 and the test shaft 2 are positioned by the stopper and connected by the bolt 5, the spray needle 8 and the ring 9 maintain a precise assembly relationship. Installing the spray needle 8 and the ring 9 via the test cover 1, the test shaft 2, and the test pressure ring 3 eliminates the need for repeated adjustment of the clearance and coaxiality between the two components, enabling quick installation.

[0024] After the test cover 1 and test shaft 2 are connected by bolts 5, the sealed chamber formed by the test cover 1, test shaft 2, spray needle 8, and mouth ring 9 can be filled with water for pressure testing. The chamber can withstand a certain pressure without worrying about the fit between the spray needle 8 and the mouth ring 9 being damaged and causing water leakage. Through the pressure test, the present invention can accurately determine the processing quality of the spray needle 8 and the mouth ring 9.

[0025] Specifically, the test shaft 2 includes a connecting plate 21 and a column 22 located in the middle of the connecting plate 21. A pressure hole 23 is provided on the connecting plate 21, and a water-sealing plug 26 is installed in the pressure hole 23. The spray needle 8 is positioned with the main body via a stopper, and the test cover 1 is connected to the connecting plate 21 and positioned via the stopper. By dividing the test shaft 2 into two parts, the connecting plate 21 and the column 22, the test cover 1, the connecting plate 21, the column 22, the spray needle 8, and the mouth ring 9 can form a sufficiently large annular closed cavity, facilitating the water flushing pressure test. The connecting plate 21 is also provided with an air vent 24 for exhausting air from the closed cavity.

[0026] Furthermore, the column 22 is provided with a rib 25 for limiting the position of the spray needle 8. After the test shaft 2 is in place, the spray needle 8 is hoisted onto the test shaft 2. At this time, the spray needle 8 contacts the rib 25 to ensure that the spray needle 8 and the test shaft 2 are concentric.

[0027] In order to prevent leakage, sealing rings 7 are provided between the test cover 1 and the test shaft 2 , between the test cover 1 and the mouth ring 9 , and between the test shaft 2 and the spray needle 8 .

[0028] The present invention further comprises a buttress 4, on which the assembled test shaft 2, test cover 1, test pressure ring 3, spray needle 8 and mouth ring 9 are turned over as a whole and placed, with the tip of the spray needle 8 facing downward.

[0029] Furthermore, before the assembled test shaft 2, test cover 1, test pressure ring 3, spray needle 8, and mouth ring 9 are turned over, a gap exists between the spray needle 8 and mouth ring 9, and copper foil is inserted into this gap. The assembly module of the test cover 1, mouth ring 9, and test pressure ring 3 is hoisted onto the assembly module of the test shaft 2 and spray needle 8. At this point, a certain gap exists between the spray needle 8 and mouth ring 9. A small amount of copper foil is inserted into this gap to prevent the spray needle 8 from shaking during the turning over. After the assembly is turned over, it is placed on the support 4, and the spray needle 8 is lifted up with a jack, and the copper foil is removed.

[0030] The inner wall of the test cover 1 is provided with a tapered surface 11 that smoothly transitions with the inner wall of the mouth ring 9 .

[0031] The tool of the present invention has a closed cavity to ensure pressure, which further improves the credibility of the test compared to testing by adding water above the sealing surface. It can not only detect the water leakage of the sealing surface under actual working conditions, but also detect whether the surface of the spray needle 8 and the mouth ring 9 will be damaged under actual working conditions.

[0032] It should be noted that: The test cover 1 and the test shaft 2 are positioned by the stopper and then connected and pre-tightened with bolts 5; the test cover 1 and the test pressure ring 3 are connected and pre-tightened by screws 6, and the mouth ring 9 and the test cover 1 are positioned by the stopper and then pressed with the test pressure ring 3; the test shaft 2 and the spray needle 8 are positioned by the stopper, and the rib 25 of the test shaft 2 does not contact the spray needle 8, and there is a gap; the spray needle 8 and the mouth ring 9 are in conical contact, which is consistent with the actual contact method of the product.

[0033] A pressure hole 23 and an air exhaust hole 24 are provided above the test shaft 2 , and water is filled into the sealed cavity composed of the test cover 1 , the test shaft 2 , the spray needle 8 , and the mouth ring 9 through the pressure hole 23 to perform pressure testing.

[0034] Screw holes are provided in the radial direction of the test cover 1 and the test shaft 2 to facilitate lifting and turning over.

[0035] The assembly method of the pressure tool for the impulse turbine needle 8 and the mouth ring 9 of this embodiment includes the following steps: S1: If Figure 2 As shown, the test shaft 2 is in place, and the spray needle 8 is hoisted onto the test shaft 2. At this time, the spray needle 8 contacts the rib 25 of the test shaft 2 to ensure that the spray needle 8 is concentric with the test shaft 2. S2: If Figure 3 As shown, assemble the test cover 1, the mouth ring 9 and the test pressure ring 3; S3: If Figure 4 As shown, the test cover 1, mouth ring 9 and test pressure ring 3 assembly module are hoisted onto the test shaft 2 and spray needle 8 assembly module; at this time, there is a gap between the spray needle 8 and the mouth ring 9, and a small amount of copper sheet is stuffed in the gap to prevent the spray needle 8 from shaking when the whole is turned over; S4: After turning over as a whole, place it on the pier 4, lift the spray needle 8 with a jack, take out the copper sheet, and slowly lower the jack; at this time, the spray needle 8 automatically falls down with the jack, contacts the conical surface of the nozzle ring 9, and then remove the jack; measure the gap between the spray needle 8 and the nozzle ring 9, and make sure that the feeler gauge does not penetrate 0.02mm and the sealing part is opaque; assembly is complete.

[0036] This method can avoid disturbances to the spray needle 8 during the lifting and assembly process, which may cause the spray needle 8 to tilt, thereby affecting the pressure value on the surface of the spray needle 8 and causing errors in the test.

[0037] The method for testing the pressure of the injection needle and the mouth ring of the impulse turbine of this embodiment includes the following steps: Y1: Carry out a pressure test according to the corresponding pressure test diagram. During the pressure test, increase the pressure by 2 MPa every 5 minutes, and maintain the pressure for 10 minutes every time the pressure increases by 2 MPa until the required pressure value is reached. After maintaining the pressure for 30 minutes, gradually reduce the pressure according to the pressure increase steps. Observe whether there is water leakage under the sealing surface of the nozzle needle 8 and the mouth ring 9 during the test. Y2: After the test is completed, dismantle the test tool, clean the spray needle 8 and the mouth ring 9, and perform 100% fluorescent penetrant testing on the sealing parts of the spray needle 8 and the mouth ring 9 to determine whether there are any defects in the spray needle 8 and the mouth ring 9.

[0038] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention falls within the scope of protection of the present invention.

Claims

1. A pressure test tool for a needle and ring of an impulse turbine, characterized by: The invention comprises a test cover (1) and a test shaft (2) connected to each other, wherein the test cover (1) and the test shaft (2) are positioned by a stopper, and the spray needle (8) and the test shaft (2) are positioned by a stopper, and a test pressure ring (3) is connected to the end of the test cover (1) away from the test shaft (2), and the mouth ring (9) and the test cover (1) are positioned by the stopper and then pressed tightly by the test pressure ring (3), and the spray needle (8) and the mouth ring (9) are in contact with each other on the conical surface; and a pressure hole (23) is provided on the test shaft (2), and water is filled into the closed cavity composed of the test cover (1), the test shaft (2), the spray needle (8), and the mouth ring (9) through the pressure hole (23) to perform pressure.

2. The tool for testing the needle and ring pressure of an impulse turbine according to claim 1, characterized in that: The test shaft (2) comprises a connecting plate (21) and a column (22) provided in the middle of the connecting plate (21); a punching hole (23) is provided on the connecting plate (21); the spray needle (8) and the main body are positioned via a stopper; and the test cover (1) is connected to the connecting plate (21) and positioned via the stopper.

3. The tool for testing the pressure of a needle and ring of an impulse turbine according to claim 2, characterized in that: The connecting plate (21) is also provided with an air exhaust hole (24).

4. The tool for testing the pressure of a needle and ring of an impulse turbine according to claim 1, characterized in that: The column (22) is provided with a rib plate (25) for limiting the position of the spray needle (8).

5. The tool for testing the pressure of the nozzle needle and the ring of an impulse turbine according to claim 1, characterized in that: Sealing rings (7) are provided between the test cover (1) and the test shaft (2), between the test cover (1) and the mouth ring (9), and between the test shaft (2) and the spray needle (8).

6. The tool for testing the pressure of a needle and ring of an impulse turbine according to claim 1, characterized in that: The device further comprises a buttress (4), wherein the assembled test shaft (2), test cover (1), test pressure ring (3), spray needle (8) and mouth ring (9) are turned over as a whole and placed on the buttress (4), with the tip of the spray needle (8) facing downward.

7. The tool for testing the pressure of the nozzle needle and the mouth ring of an impulse turbine according to claim 6, characterized in that: Before the assembled test shaft (2), test cover (1), test pressure ring (3), spray needle (8) and mouth ring (9) are turned over as a whole, there is a gap between the spray needle (8) and the mouth ring (9), and the gap between the spray needle (8) and the mouth ring (9) is plugged with copper sheet.

8. The tool for testing the needle and ring pressure of an impulse turbine according to claim 1, characterized in that: The inner wall of the test cover (1) is provided with a tapered surface (11) that smoothly transitions with the inner wall of the mouth ring (9).

9. A method for assembling a pressure tool for a Pelton turbine nozzle (8) and a mouth ring (9), for assembling a Pelton turbine nozzle and a mouth ring pressure test tool according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The test shaft (2) is positioned, and the spray needle (8) is hoisted onto the test shaft (2). At this time, the spray needle (8) contacts the rib (25) of the test shaft (2) to ensure that the spray needle (8) and the test shaft (2) are concentric. S2: Assemble the test cover (1), the mouth ring (9) and the test pressure ring (3); S3: Hoist the test cover (1), mouth ring (9) and test pressure ring (3) assembly module onto the test shaft (2) and spray needle (8) assembly module; at this time, there is a gap between the spray needle (8) and the mouth ring (9), and a small amount of copper foil is stuffed in the gap to prevent the spray needle (8) from shaking when the whole is turned over; S4: After turning over as a whole, place it on the pier (4), lift the spray needle (8) with a jack, take out the copper sheet, and slowly lower the jack; at this time, the spray needle (8) automatically falls down with the jack, and contacts the conical surface of the nozzle ring (9) and then remove the jack; measure the gap between the spray needle (8) and the nozzle ring (9) to 0.02mm, and the feeler gauge cannot be inserted and the sealing part is not transparent; assembly is completed.

10. A method for testing the pressure of a Pelton turbine needle and a ring, using the Pelton turbine needle and a ring pressure testing tool according to any one of claims 1 to 8, characterized in that: The following steps are involved: Y1: Carry out the pressure test according to the corresponding pressure test diagram. During the pressure test, increase the pressure by 2MPa every 5 minutes, and maintain the pressure for 10 minutes every time the pressure increases by 2MPa until the required pressure value is reached. After maintaining the pressure for 30 minutes, gradually reduce the pressure according to the pressure increase steps; Observe whether there is water leakage under the sealing surface of the nozzle needle (8) and the mouth ring (9) during the test; Y2: After the test is completed, dismantle the test tool, clean the spray needle (8) and the mouth ring (9), and perform a 100% fluorescent penetrant test on the sealing parts of the spray needle (8) and the mouth ring (9) to determine whether the spray needle (8) and the mouth ring (9) have defects.

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