A precision airtight casting hydraulic testing fixture

Abstract

A precision airtightness casting hydraulic pressure testing fixture includes a test platform. The front face of the test platform has a supporting protrusion adapted to a second recessed groove. The supporting protrusion is located within the second recessed groove and seals the inner end face of the groove. An end cap body is sealed to the front face of the test platform. The test platform has a through-flow water inlet and a through-flow pressure inlet. A pressure gauge connected to the pressure inlet is located on the rear side of the test platform. Both the water inlet and the pressure inlet are connected to the recessed cavity. The end cap body is sealed and locked to the front face of the test platform. Test water is then injected into the recessed cavity of the end cap body through the water inlet. When the test water reaches the required pressure, the pressure in the cavity is maintained. Finally, the pressure gauge reading is observed to determine whether the airtightness and pressure-bearing capacity of the end cap body meet the design requirements. This invention can realize the testing of the airtightness and pressure-bearing capacity of cast end caps on compressors, ensuring the production quality of cast end caps.

Description

Technical Field

[0001] This utility model relates to a testing device, specifically a precision airtightness casting hydraulic pressure testing fixture. Background Technology

[0002] With the rapid development of my country's industry, casting technology is being used more and more widely. Casting boasts advantages such as high and stable dimensional accuracy, good surface finish, high material utilization, and high production efficiency. However, currently, casting is mainly used for processing exterior and structural parts. For parts requiring airtightness, casting can easily create porosity or pinholes, affecting the airtightness of the parts. Currently, cast end caps used in compressors also have strict requirements for their sealing and pressure-bearing capacity, such as… Figure 6 As shown, existing cast end caps used in compressors include an end cap body 16. The rear end of the end cap body 16 has a cavity 17, within which are interconnected first recessed grooves 18 and second recessed grooves 19. The second recessed groove 19 extends from front to back. The end cap body 16 has multiple first locking holes 20. Currently, there is no dedicated testing device to accurately test the airtightness and pressure resistance of existing cast end caps used in compressors. This leads to safety hazards such as leakage, compressor housing deformation, or cracking during compressor use. Utility Model Content

[0003] This utility model provides a precision airtightness casting hydrostatic testing fixture, the main purpose of which is to overcome the problem that there is no dedicated testing device for testing the airtightness and pressure bearing capacity of the cast end caps on existing compressors.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A precision airtight casting hydraulic pressure testing fixture includes a test platform. The front end face of the test platform is provided with a support protrusion adapted to a second recessed groove. The support protrusion is located in the second recessed groove and seals the inner end face of the second recessed groove. An end cap body is sealed to the front end face of the test platform. The test platform is provided with a water inlet and a pressure inlet that are connected to the front and rear. A pressure gauge connected to the pressure inlet is provided on the rear side of the test platform. Both the water inlet and the pressure inlet are connected to the recessed cavity.

[0005] Furthermore, the front end face of the test platform is provided with a first sealing ring groove, and a first sealing ring is provided in the first sealing ring groove, with the first sealing ring located on the periphery of the cavity.

[0006] Furthermore, a second sealing ring groove is provided on the outer periphery of the front part of the supporting protrusion, and a second sealing ring is provided in the second sealing ring groove.

[0007] Furthermore, the rear end of the supporting protrusion is provided with a through cut on both sides, and the front end of the pressure water inlet is located inside the cut.

[0008] Furthermore, the front end face of the test platform is provided with a plurality of second locking holes, each second locking hole corresponding to a first locking hole of the end cap body. The end cap body is locked to the front end face of the test platform by a plurality of bolts, each bolt passing through the first locking hole and threadedly connected to the second locking hole.

[0009] Furthermore, the test bench is provided with a water inlet pipe and a pressure water pipe at its rear end. The water inlet pipe is connected to the water inlet, and the pressure water pipe is connected to the pressure water inlet. The pressure gauge is connected to the rear end of the pressure water pipe.

[0010] Furthermore, the present invention also includes two tooling supports arranged on the left and right sides, and the bottom of the test platform is connected to the top surface of the two tooling supports.

[0011] As described above, compared with the prior art, this utility model has the following advantages: The end cap body is sealed and locked to the front end face of the test bench. Then, test water is injected into the cavity of the end cap body through the inlet. When the test water reaches the required pressure, the pressure in the cavity is maintained. If the pressure gauge reading does not change during the pressure maintenance period, it indicates that the airtightness and pressure-bearing capacity of the end cap body meet the requirements. During the pressure maintenance period, if there are air holes in the end cap body or if the end cap body leaks test water due to deformation, causing the pressure gauge reading to drop, it indicates that the airtightness and / or pressure-bearing capacity of the end cap body do not meet the requirements. This utility model can specifically achieve rapid testing of the airtightness and pressure-bearing capacity of cast end caps on compressors, ensuring the production quality of cast end caps. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the present invention.

[0013] Figure 2 This is a structural diagram of the present invention from another angle.

[0014] Figure 3 This is a structural diagram of the present invention from another angle.

[0015] Figure 4 This is an exploded view of the structure of this utility model.

[0016] Figure 5 This is a diagram showing the usage state of this utility model.

[0017] Figure 6 This is a structural diagram of the cast end cover on the compressor. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6 A precision airtight casting hydraulic pressure testing fixture includes a test platform 1. The front end face of the test platform 1 has a supporting protrusion 2 adapted to a second recessed groove 19. The supporting protrusion 2 is located within the second recessed groove 19 and seals the inner end face of the second recessed groove 19. An end cap body 16 is sealed to the front end face of the test platform 1. The test platform 1 has a front-to-back through water inlet 3 and a front-to-back through pressure inlet 4. A pressure gauge 5 communicating with the pressure inlet 4 is located on the rear side of the test platform 1. Both the water inlet 3 and the pressure inlet 4 are connected to a cavity 17. This utility model also includes two fixture supports 6 arranged left and right. The bottom of the test platform 1 is connected to the top surface of the two fixture supports 6, which provide support for the test platform 1.

[0022] Reference Figure 1 , Figures 4 to 6The front end face of the test platform 1 is provided with a first sealing ring groove 7, and a first sealing ring 8 is provided in the first sealing ring groove 7. The first sealing ring 8 is located on the periphery of the cavity 17. After the end cap body 16 is connected to the front end face of the test platform 1, the first sealing ring 8 provides a seal between the rear end face of the end cap body 16 and the front end face of the test platform 1. The front outer periphery of the support protrusion 2 is provided with a second sealing ring groove 9, and a second sealing ring 10 is provided in the second sealing ring groove 9. After the support protrusion 2 is inserted into the second recessed groove 19, the second sealing ring 10 provides a seal between the inner peripheral surface of the second recessed groove 19 and the outer peripheral surface of the support protrusion 2.

[0023] Reference Figures 1 to 3 , Figure 5 and Figure 6 The rear end of the supporting protrusion 2 is provided with a through-cut 11, and the front end of the pressure water inlet 4 is located inside the cut 11. The cut 11 allows the pressure testing water to flow through, so that the pressure water inlet 4 is connected to the cavity 17 of the end cap body 16. The rear end of the test platform 1 is provided with a water inlet pipe 12 and a pressure water pipe 13. The water inlet pipe 12 is connected to the water inlet 3, and the pressure water pipe 13 is connected to the pressure water inlet 4. The pressure gauge 5 is connected to the rear end of the pressure water pipe 13.

[0024] Reference Figure 1 , Figure 5 and Figure 6 The front end face of the test platform 1 is provided with a plurality of second locking holes 14, each second locking hole 14 corresponding to a first locking hole 20 of the end cap body 16. The end cap body 16 is locked to the front end face of the test platform 1 by a plurality of bolts 15, each bolt 15 passing through the first locking hole 20 and threadedly connected to the second locking hole 14. In this embodiment, there are six first locking holes 20, six second locking holes 14, and six bolts 15.

[0025] Reference Figures 1 to 3 , Figure 5 and Figure 6 The design principle of this utility model is as follows: The end cap body 16 is sealed and locked to the front end face of the test bench 1 by multiple bolts 15. Then, the hydraulic press is connected to the water inlet pipe 12, and test water is injected into the cavity 17 of the end cap body 16 from the water inlet 3. When the test water is injected to the required pressure, the test water in the cavity 17 is pressurized. If the value of the pressure gauge 5 does not change during the pressurization period, it means that the airtightness and pressure bearing capacity of the end cap body 16 meet the requirements. During the pressurization period, if there are air holes in the end cap body 16 or the test water leaks due to deformation of the end cap body 16, and the value of the pressure gauge 5 drops, it means that the airtightness and / or pressure bearing capacity of the end cap body 16 do not meet the requirements.

[0026] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A precision airtight casting hydraulic pressure testing fixture, characterized in that: The test platform includes a support protrusion on its front end face that is adapted to a second recessed groove. The support protrusion is located inside the second recessed groove and seals the inner end face of the second recessed groove. The end cap body is sealed to the front end face of the test platform. The test platform has a water inlet and a pressure water inlet that are connected to the front and rear. A pressure gauge connected to the pressure water inlet is provided on the rear side of the test platform. Both the water inlet and the pressure water inlet are connected to the recessed cavity.

2. The precision airtightness casting hydraulic testing fixture as described in claim 1, characterized in that: The front end face of the test bench is provided with a first sealing ring groove, and a first sealing ring is provided in the first sealing ring groove. The first sealing ring is located on the periphery of the cavity.

3. The precision airtightness casting hydraulic testing fixture as described in claim 1, characterized in that: The front outer periphery of the support protrusion is provided with a second sealing ring groove, and a second sealing ring is provided in the second sealing ring groove.

4. The precision hydrostatic casting water pressure testing fixture of claim 1, wherein: The rear end of the support protrusion has a through cut, and the front end of the pressure water inlet is located inside the cut.

5. The precision airtightness casting hydraulic testing fixture as described in claim 1, characterized in that: The front end face of the test bench is provided with multiple second locking holes, each second locking hole corresponding to a first locking hole of the end cap body. The end cap body is locked to the front end face of the test bench by multiple bolts, each bolt passing through the first locking hole and threadedly connected to the second locking hole.

6. The precision airtightness casting hydraulic testing fixture as described in claim 1, characterized in that: The test bench is equipped with a water inlet pipe and a pressure water pipe at its rear end. The water inlet pipe is connected to the water inlet, and the pressure water pipe is connected to the pressure water inlet. The pressure gauge is connected to the rear end of the pressure water pipe.

7. The precision airtightness casting hydraulic testing fixture as described in claim 1, characterized in that: It also includes two tooling brackets arranged on the left and right, with the bottom of the test platform connected to the top surface of the two tooling brackets.

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