A leak detection device for metal casting detection

Abstract

The present invention relates to the technical field of casting side leakage detection, and specifically to a leak detection device for detecting metal castings, which is used to detect whether a water pump housing casting has side leakage, and comprises a sealing head sealedly connected to an input end or an output end of the water pump housing, and a first air injection pipe fixedly installed on the sealing head, a first pressure sensor being installed on the first air injection pipe, a sealing cover being fixedly installed outside the first air injection pipe, a detection box being detachably connected to the bottom of the sealing cover, a second air injection pipe and a second pressure sensor being fixedly connected to the sealing cover, the detection box being filled with liquid, an end of the water pump housing output end or input end that is not connected to the sealing head being vertically inserted into the liquid, the liquid submerging the water pump housing and filling the water pump housing, and a pressurized chamber being formed between the liquid surface and the sealing cover.

Description

Technical Field

[0001] The invention relates to the technical field of casting side leakage detection, and in particular to a leakage detection device for metal casting detection. Background Art

[0002] In the foundry industry, some castings with cavities, such as water pump housings, are generally used as oil chambers, circulating water chambers, compression chambers, etc. For such castings, pressure tests must be performed on the cavities during quality inspection to ensure that the cavities are well sealed and there is no risk of leakage.

[0003] At present, when performing pressure testing on water pump housing castings, two sealing heads are generally used to seal the output end and the input end. An air injection pipe is installed on one of the sealing heads, and a predetermined air pressure is injected into the air injection pipe to observe whether there is any change, so as to determine whether there is side leakage.

[0004] The main problems are: first, two sealing heads are needed, and the cost of use needs to be reduced; second, only side leakage is detected, but it is not known where the leakage occurs, which is inconvenient for maintenance, and another process is required to detect the side leakage point.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0006] The purpose of the present invention is to design a device that can detect whether side leakage occurs with only one sealing head and can also detect the location of the side leakage point, so as to solve the above-mentioned shortcomings in the technology.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a leak detection device for metal casting detection, which is used to detect whether a water pump housing casting has side leakage, comprising a sealing head sealedly connected to the input end or output end of the water pump housing, and a first air injection pipe fixedly installed on the sealing head, a first pressure sensor is installed on the first air injection pipe, characterized in that: a sealing cover is fixedly installed outside the first air injection pipe, a detection box is detachably connected to the bottom of the sealing cover, a second air injection pipe and a second pressure sensor are also fixedly connected to the sealing cover, the detection box is filled with liquid, the end of the output end or input end of the water pump housing that is not connected to the sealing head is vertically inserted into the liquid, the liquid submerges the water pump housing and fills the water pump housing, and a pressurized chamber is formed between the liquid surface and the sealing cover;

[0008] The water pump casing is placed vertically into the detection box and submerged in the liquid. Only one sealing head is used to seal one end of the water pump casing. At the same time, air is injected into the first air injection pipe and the second air injection pipe, so that the air pressure in the first air injection pipe is the required value for detection, and the air in the first air injection pipe gradually squeezes the liquid in the water pump casing from the other end of the water pump casing into the detection box until a part of the liquid remains at the end of the water pump casing inserted into the liquid surface to form a liquid seal.

[0009] Preferably, a fixing component is fixedly installed in the detection box, and when the fixing component fixes and contacts the water pump housing, the water pump housing is perpendicular to the horizontal plane, and the output end of the water pump housing passes through the fixing component.

[0010] Preferably, when the fixing assembly contacts the water pump housing, there is a distance between the output end of the water pump housing and the bottom surface of the inner cavity of the detection box.

[0011] Preferably, the fixing component is penetrated by a plurality of through holes distributed in a ring array.

[0012] Preferably, when the sealing cover and the detection box are fixedly sealed, the sealing head is sealedly connected to the input end of the water pump housing.

[0013] Preferably, the detection box is configured as a high-pressure resistant glass material component.

[0014] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0015] Through the cooperation of the detection box, liquid, second gas injection pipe and other parts, a water seal is formed on the output end of the water pump housing, and a sealing head is omitted, which not only saves production costs, but also can still inject a predetermined gas into the water pump housing to form a predetermined air pressure to detect whether there is side leakage;

[0016] After the water seal is formed, the inspector can visually observe whether bubbles appear on the surface of the water pump housing, thereby marking the leakage point of the water pump housing in real time, which is convenient for subsequent repairs.

[0017] At the same time, during detection, since the liquid in the water pump housing is squeezed out from top to bottom, as the liquid level in the water pump housing drops, the gas in the water pump housing can be discharged from the leaking part at the first time, and bubbles will emerge, so that the user does not need to observe the values ​​of the first pressure sensor and the second pressure sensor to know that side leakage has occurred, and only needs to pay attention to the side leakage point. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a split cross-sectional view of the present invention;

[0021] Figure 3 It is a schematic diagram of the installation of the detection box and the water pump housing of the present invention.

[0022] Description of reference numerals:

[0023] 1. Water pump housing; 2. Sealing head; 3. First air injection pipe; 4. First pressure sensor; 5. Sealing cover; 6. Detection box; 7. Second air injection pipe; 8. Second pressure sensor; 9. Liquid; 10. Pressurized chamber; 11. Fixing assembly; 12. Through hole. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] The present invention provides Figure 1-3A metal casting detection leak detection device shown is used to detect whether the water pump housing 1 casting has side leakage. The prior art uses two sealing heads 2 to be sealed and connected to the output end and the input end of the water pump housing 1 respectively, and a first air injection pipe 3 is fixedly installed on a sealing head 2 to isolate the entire water pump housing 1 from the outside. Then, the first air injection pipe 3 is used to inject gas into the water pump housing 1 to form a high-pressure environment during operation. The first pressure sensor 4 fixedly installed on the first air injection pipe 3 is used to detect the pressure value inside the water pump housing 1. Under a predetermined pressure and duration, it is detected whether the pressure value inside the water pump housing 1 is reduced. The present technical solution omits a sealing head 2. In this way, according to different models of the water pump housing 1, only one sealing head 2 needs to be equipped to form a seal with an output end or an input end with a relatively simple shape. First, the production and manufacturing of a sealing head 2 with a complex shape is omitted, and second, the detection cost is reduced.

[0027] On the retained sealing head 2, we still fix a first air injection pipe 3, on which a first pressure sensor 4 is fixedly installed, and outside the first air injection pipe 3, a sealing cover 5 is fixedly installed, on which a second air injection pipe 7 and a second pressure sensor 8 are fixedly installed, and a sealed detection box 6 is detachably connected to the bottom of the sealing cover 5, and a fixing component 11 is installed in the detection box 6. When the water pump housing 1 to be detected is fixedly installed on the fixing component 11, the output end of the water pump housing 1 is placed vertically, and liquid 9 is injected into the detection box 6 so that the liquid 9 submerges the water pump housing 1 and fills the water pump housing 1. When the sealing cover 5 is installed on the detection box 6, The sealing head 2 forms a seal with the input end of the water pump housing 1. At this time, a pressurized chamber 10 is formed between the liquid 9 surface and the sealing cover 5. The sealing cover 5 cooperates with the first air injection pipe 3 to press the water pump housing 1 onto the fixing component 11. The sealing head 2 can also be directly sealed and connected with the input end of the water pump housing 1, and then the water pump housing 1 is placed in the detection box 6, and then the sealing cover 5 and the detection box 6 are sealed and installed. At this time, the first air injection pipe 3 needs to be a flexible pipe that can withstand air pressure, and then gas is injected into the second air injection pipe 7. After the gas enters the detection box 6, the air pressure of the pressurized chamber 10 is enhanced, and the liquid 9 in the detection box 6 is squeezed into the inner cavity of the water pump housing 1 to achieve the same initial state;

[0028] During the detection, the user injects gas into the first gas injection pipe 3 and the second gas injection pipe 7 at the same time to keep the liquid level in the detection box 6 unchanged. When the first pressure sensor 4 detects that the pressure value in the first gas injection pipe 3 reaches the target value, the air in the second gas injection pipe 7 is gradually extracted. At this time, the liquid 9 in the water pump housing 1 will be gradually squeezed downward. At this time, we need to ensure that when the water pump housing 1 is placed on the fixed component 11, there is a gap between the output end of the water pump housing 1 and the bottom surface of the inner cavity of the detection box 6, so that the liquid 9 in the water pump housing 1 is conveniently squeezed into the detection box 6, and we need to continue to inject pressure into the first gas injection pipe 3 to always keep the pressure value detected by the first pressure sensor 4 unchanged. We need to open a plurality of through holes 12 distributed in a circular array on the fixed component 11, so that the water discharged from the water pump housing 1 compresses the pressurized chamber 10 through the through holes 12, instead of directly impacting the water pump housing 1 through the connection between it and the fixed component 11, to ensure that the water pump housing 1 always keeps the output shaft perpendicular to the horizontal plane;

[0029] When the liquid 9 level rises to a predetermined height in the detection box 6, a part of the liquid 9 is still in the output end of the water pump housing 1, and most of it is between the water pump housing 1 and the detection box 6. Therefore, the output end of the water pump housing 1 forms a water seal. At this time, gas is injected into the second air injection pipe 7 so that the liquid 9 level no longer rises. Then, the injection of gas into the first air injection pipe 3 and the second air injection pipe 7 is synchronously stopped. Then, the inspector observes the pressure values ​​displayed by the first pressure sensor 4 and the second pressure sensor 8 to check whether the pressure values ​​have changed. If there is no change within the predetermined time, it means that the water pump housing 1 has no side leakage. It is only necessary to synchronously withdraw the air injected into the first air injection pipe 3 and the second air injection pipe 7. If there is a change within the predetermined time, it means that the water pump housing 1 has a side leakage. At the same time, because the detection box 6 is set as a high-pressure resistant glass material component, all inspectors can directly visually see that the gas in the water pump housing 1 enters the detection box 6 through the side leakage point. The inspector only needs to observe where the bubbles are bubbling in the water pump housing 1 to mark the side leakage point of the water pump housing 1.

[0030] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are exemplary only. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application.

Claims

1. A leak detection device for metal castings, used to detect whether a casting of a water pump housing (1) has side leakage, comprising a sealing head (2) sealedly connected to an input end or an output end of the water pump housing (1), and a first air injection pipe (3) fixedly mounted on the sealing head (2), wherein a first pressure sensor (4) is mounted on the first air injection pipe (3), characterized in that: A sealing cover (5) is fixedly mounted outside the first gas injection pipe (3), a detection box (6) is detachably connected to the bottom of the sealing cover (5), a second gas injection pipe (7) and a second pressure sensor (8) are also fixedly connected to the sealing cover (5), the detection box (6) is filled with liquid (9), the output end or the input end of the water pump housing (1) not connected to the sealing head (2) is vertically inserted into the liquid (9), the liquid (9) submerges the water pump housing (1) and fills the water pump housing (1), and a pressurized chamber (10) is formed between the liquid surface of the liquid (9) and the sealing cover (5); The water pump housing (1) is vertically placed in the detection box (6) and submerged in the liquid (9). Only one sealing head (2) is used to seal one end of the water pump housing (1). At the same time, air is injected into the first air injection pipe (3) and the second air injection pipe (7) so that the air pressure in the first air injection pipe (3) reaches a value required for detection, and the air in the first air injection pipe (3) gradually squeezes the liquid (9) in the water pump housing (1) from the other end of the water pump housing (1) into the detection box (6) until a portion of the liquid (9) remains at the end of the water pump housing (1) inserted into the liquid (9) surface to form a liquid (9) seal.

2. A leak detection device for metal castings according to claim 1, characterized in that: A fixing component (11) is fixedly installed in the detection box (6); when the fixing component (11) contacts the water pump housing (1), the water pump housing (1) is perpendicular to a horizontal plane, and the output end of the water pump housing (1) passes through the fixing component (11).

3. A leak detection device for metal castings according to claim 2, characterized in that: When the fixing component (11) fixes and contacts the water pump housing (1), a distance exists between the output end of the water pump housing (1) and the bottom surface of the inner cavity of the detection box (6).

4. A leak detection device for metal castings according to claim 2, characterized in that: The fixing component (11) is penetrated by a plurality of through holes (12) distributed in a ring array.

5. A leak detection device for metal castings according to claim 1, characterized in that: When the sealing cover (5) and the detection box (6) are fixedly sealed, the sealing head (2) is sealedly connected to the input end of the water pump housing (1).

6. A leak detection device for metal castings according to claim 1, characterized in that: The detection box (6) is configured as a high-pressure resistant glass material component.

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