Diesel engine high sealing inlay type indicator valve nut and processing method thereof

Abstract

The application provides a high-sealing diesel engine inlaid type indicator valve nut and a processing method thereof. A stepped groove with a large upper end and a small lower end is formed on the lower end surface of the nut body. An inner thread is formed on the inner wall of the small diameter section of the stepped groove, which is matched with the outer thread of the valve body port. A stop ring groove with a maximum diameter smaller than the diameter of the large diameter section of the stepped groove is formed on the top of the stepped groove. A disc-shaped sealing plate processed by a deformation die is matched with the stop ring groove. The disc-shaped and plastic sealing plate is inlaid and fixed in the nut body after being pressed and expanded into a flat plate by an expansion head. The inlaid and fixed plastic sealing plate on the top of the stepped groove of the nut body is used to make the valve body port and the nut body threadedly connected. The end of the valve body is pressed on the plastic deformed sealing plate to realize the reliable sealing between the valve body end and the nut body. The poor sealing problem of the indicator valve nut blocking the interface of the indicator is solved. The sealing performance of the indicator valve nut is improved. The inlaid sealing plate is firm, the cost is low, and the indicator valve nut can be mass produced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of diesel engines, and particularly relates to a high-sealing embedded type indicator valve nut for diesel engines and a processing method thereof. BACKGROUND

[0002] The indicator valve assembly of a diesel engine is used to connect an indicator and measure the in-cylinder explosion pressure to draw the explosion pressure curve. When the indicator valve assembly is in a non-working state, an indicator valve nut (also known as a protective cap) is used to block the interface of the indicator. Due to the high temperature and high pressure in the cylinder of the diesel engine, the indicator valve nut must be tightly sealed with the valve body. Common indicator valve nuts are generally of an integral structure, and the bottom of the screw hole is a flat surface. Such indicator valve nuts have simple structures and low processing costs, but the sealing performance of the indicator valve nut and the valve body is poor. Analysis shows that the poor sealing performance is mainly caused by three factors. First, the plasticity of the sealing surface of the nut body is poor due to the limitation of the material, and the sealing effect is not good. Second, the use of such an indicator valve nut requires a high perpendicularity and surface roughness of the valve body interface end surface, and the valve body is difficult to process. Third, the perpendicularity and surface perpendicularity of the bottom flat surface of the nut relative to the thread are required to be high, and the nut itself is difficult to process. Therefore, it is necessary to improve the structure of the indicator valve nut to solve the above problems. SUMMARY

[0003] The present application solves the technical problem of providing a high-sealing embedded type indicator valve nut for diesel engines and a processing method thereof. Based on a deformed die and an expanded head, a plastic sealing plate is embedded and fixed on the top of the stepped groove of the nut body. After the valve body port is tightly connected with the thread of the nut body, the end of the valve body is placed on the plastic deformed sealing plate to achieve reliable sealing between the valve body end and the nut body. The sealing performance of the indicator valve nut is improved, the sealing plate is firmly embedded, the design requirements are met, the processing cost is low, the operation is simple, it is suitable for mass production, the application range is wide, and it has high popularization value.

[0004] The technical solution adopted by the present application is as follows: a high-sealing embedded type indicator valve nut for diesel engines, comprising a nut body with an open lower end and a sealed upper end. A stepped groove with a large upper end and a small lower end is formed on the lower end surface of the nut body, and an internal thread is formed on the inner wall of the small diameter section at the lower end of the stepped groove, which is adapted to connect with the external thread at the valve body port. A plastic sealing plate is embedded and fixed on the top of the large diameter section of the stepped groove. After the valve body port is tightly connected with the internal thread of the nut body, the end of the valve body is placed on the plastic deformed sealing plate to achieve sealing of the valve body port.

[0005] The top of the stepped groove is provided with a stop ring groove with a maximum diameter smaller than the diameter of the large diameter section of the stepped groove, and the sealing plate is embedded and fixed in the nut body.

[0006] Further, the cross-sectional shape of the stop ring groove is inverted conical structure, the taper angle of the stop ring groove is 90°, and the upper end of the stop ring groove is treated along the inverted round angle.

[0007] Further, the sealing plate is made of red copper material.

[0008] The processing method of the diesel engine high sealing inlaid type indicator valve nut comprises the following steps:

[0009] 1) An inner thread for adapting and connecting with the outer thread at the port of the valve body is made on the inner wall of the small diameter end of the lower end of the stepped groove of the nut body, the top of the large diameter section of the stepped groove is processed with a stop ring groove with inverted conical structure, the maximum diameter of the stop ring groove is smaller than the diameter of the large diameter section of the stepped groove, the taper angle of the stop ring groove is 90°, and the upper end of the stop ring groove is treated along the inverted round angle;

[0010] 2) A circular plate shaped sealing plate with a diameter corresponding to the maximum diameter of the stop ring groove is processed into a disc shaped sealing plate by using a deformation die, and the diameter of the opening end of the disc shaped sealing plate is not greater than the diameter of the lower end port of the stop ring groove and not greater than the diameter of the inner thread;

[0011] 3) The processed disc shaped sealing plate is installed into the stop ring groove, and then the disc shaped sealing gasket is pressed and expanded into a flat plate by the expanding head and inlaid and fixed in the nut body.

[0012] In the above step 2), the deformation die comprises a top head seat, a guide sleeve and a top head, the top head seat is interference fitted in the inner hole of the guide sleeve, the lower end of the top head seat and the guide sleeve is located on the same plane, the upper end surface of the top head seat is provided with a disc shaped groove, the top head is a stepped shaft with the upper end diameter greater than the lower end diameter, the large diameter section of the top head at the lower end located in the inner hole of the guide sleeve is clearance fitted with the inner hole of the guide sleeve, the small diameter section of the top head at the lower end is a disc shaped head adapted to the disc shaped groove, and after the disc shaped sealing plate is lowered to the disc shaped head and the disc shaped groove wall of the disc shaped groove respectively abuttingly contacted, the disc shaped sealing plate is realized to be stamped and formed.

[0013] In the above step 3), the expanding head is T-shaped shaft structure, the diameter of the small diameter section of the expanding head is the same as the diameter of the disc shaped sealing plate, and the length of the small diameter section of the expanding head is greater than the sum of the depth of the stop ring groove and the stepped groove.

[0014] Compared with the prior art, the advantages of the present application are:

[0015] 1) By inlaying and fixing the sealing plate with plastic on the top of the stepped groove of the nut body, after the valve body port is threadedly connected with the nut body, the end of the valve body is abutted on the sealing plate which is plastically deformed, the reliable sealing between the valve body and the nut body is realized, and the problem of poor sealing of the indicator valve nut for blocking the interface of the indicator is effectively solved.

[0016] 2、The technical scheme provides a reliable and efficient stamping structure for reducing the outer diameter of the sealing plate by stamping the flat sealing plate into a disc-shaped structure, has high stamping efficiency, and has good consistency in stamping and forming of the sealing plate, thereby facilitating batch production.

[0017] 3、The unfolded head of the T-shaped shaft structure can quickly unfold the disc-shaped sealing plate loaded into the nut body, the high flatness of the small-diameter end face of the unfolded head can ensure the flatness of the unfolded sealing plate, thereby effectively sealing the valve body port through the sealing plate after the valve body port and the nut body are threadedly connected.

[0018] 4、The technical scheme has simple structure, novel design, improved sealing performance of the indicator valve nut, firmly embedded sealing plate, meets design requirements, low processing cost, simple operation, suitable for batch production, wide application range, and high popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the present application;

[0020] Figure 2 is a structural schematic view of the nut body of the present application;

[0021] Figure 3 is a use state diagram of the deformation die when the sealing plate is not stamped and formed;

[0022] Figure 4 is a use state diagram of the deformation die after the sealing plate is stamped and formed;

[0023] Figure 5 is a structural schematic view of the unfolded head. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the present application will be described below. Figures 1-5 The technical scheme in the embodiments of the present application will be described below.

[0025] It has to be understood that, in the present text, the terms "comprising", "including", or any other variant thereof, are intended to cover non-exclusive inclusions, such that processes, methods, articles, or devices that comprise a list of elements are not limited to those elements, but are also inclusive of other elements not expressly listed, or even inherent to such processes, methods, articles, or devices. Without further limitation, an element defined by the phrase "comprising a... " does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element.

[0026] A high sealing diesel engine inlaid type indicator valve nut, as shown, including the lower end open while the upper end closed nut body 1, the lower end face of the nut body 1 is made of large to small step groove 1-1, and the inner wall of the small diameter section of the step groove 1-1 is made of internal thread 1-2 which is adapted to connect with the external thread at the valve body port, the top of the large diameter section of the step groove 1-1 is inlaid and fixed with a plastic sealing plate 3, and the valve body port is threadedly connected with the internal thread 1-2 of the nut body 1, and the valve body end is abutted on the sealing plate 3 which is plastically deformed, thereby realizing the sealing of the valve body port. Figures 1-5

[0027] Wherein, the top of the step groove 1-1 is provided with a stop ring groove 1-3 with a maximum diameter smaller than the diameter of the large diameter section of the step groove 1-1, and the sealing plate 3 is inlaid and fixed in the nut body 1; Specifically, the cross-sectional shape of the stop ring groove 1-3 is a reverse tapered structure, the taper angle of the stop ring groove 1-3 is 90°, and the upper end groove of the stop ring groove 1-3 is treated along the reverse fillet; Specifically, the sealing plate 3 is made of red copper material.

[0028] The processing method of the high sealing diesel engine inlaid type indicator valve nut, comprising the following steps:

[0029] 1) An internal thread 1-2 is made on the inner wall of the small diameter end of the step groove 1-1 of the nut body 1 for adapting to connect with the external thread at the valve body port, the top of the large diameter section of the step groove 1-1 is processed with a stop ring groove 1-3 with a reverse tapered cross-sectional shape, and the maximum diameter of the stop ring groove 1-3 is smaller than the diameter of the large diameter section of the step groove 1-1, the taper angle of the stop ring groove 1-3 is 90°, and the upper end groove of the stop ring groove 1-3 is treated along the reverse fillet;

[0030] ​2) the sealing plate 3 in the shape of a disc is formed by using a deforming die 4, the diameter of the opening end of the disc-shaped sealing plate 3 is not greater than the diameter of the lower end of the ring groove 1-3, and the diameter of the disc-shaped sealing plate 3 is not greater than the diameter of the internal thread 1-2; specifically, the deforming die 4 comprises a punch seat 4-1, a guide sleeve 4-2 and a punch 4-3, the punch seat 4-1 is in interference fit in the inner hole of the guide sleeve 4-2, and the lower ends of the punch seat 4-1 and the guide sleeve 4-2 are located on the same plane, a disc-shaped recess 4-4 is formed on the upper end surface of the punch seat 4-1, the punch 4-3 is a stepped shaft with the diameter of the upper end being greater than the diameter of the lower end, the large-diameter section of the punch 4-3 in the inner hole of the guide sleeve 4-2 is in clearance fit with the inner hole of the guide sleeve 4-2, the small-diameter section of the punch 4-3 is a disc-shaped head 4-5 which is adapted to the disc-shaped recess 4-4, and after the punch 4-3 is moved downward to the disc-shaped recess 4-4 and the upper and lower end surfaces of the disc-shaped sealing plate 3 are in close contact with the outer wall of the disc-shaped head 4-5 and the groove wall of the disc-shaped recess 4-4 respectively, the disc-shaped sealing plate 3 is formed by stamping.

[0031] 3) the disc-shaped sealing plate 3 is loaded into the ring groove 1-3, and then the disc-shaped sealing plate 3 is pressed and expanded into a flat plate by the expanding head 2 and is inlaid and fixed in the nut body 1; specifically, the expanding head 2 is in the shape of a T-shaped shaft, the diameter of the small-diameter section of the expanding head 2 is the same as the diameter of the disc-shaped sealing plate 3, and the length of the small-diameter section of the expanding head 2 is greater than the sum of the depth of the ring groove 1-3 and the stepped groove 1-1; in the above step, the expanding head 2 in the shape of a T-shaped shaft can quickly expand the disc-shaped sealing plate 3 loaded into the nut body 1, and the high flatness of the end surface of the small-diameter section of the expanding head 2 can ensure the flatness of the expanded sealing plate 3, so that the valve body port and the nut body 1 are threadedly fixed, and the valve body port is effectively sealed by the sealing plate 3;

[0032] In the technical solution, the disc-shaped sealing plate 3 with plasticity is inlaid and fixed on the top of the stepped groove of the nut body 1, so that the valve body end is abutted on the sealing plate 3 which is plastically deformed, the reliable sealing between the valve body end and the nut body 1 is realized, and the problem of poor sealing of the nut of the indicator and seal valve on the interface of the indicator is effectively solved;

[0033] With the thread specification of the indicator valve nut as W27-1 / 10 as an example, in order to ensure that the sealing plate 3 made of red copper plate can be embedded on the top plane of the stepped groove 1-1 of the nut body 1, a small-depth large-diameter stop ring groove 1-3 is processed on the top plane of the stepped groove 1-1, a circular red copper plate with a diameter corresponding to the top of the stop ring groove 1-3 is pressed into a disc-shaped sealing plate 3 by using the plastic and easy deformation characteristics of red copper, so that the outer diameter of the sealing plate 3 is contracted to be smaller than the diameter of the stop hole, the sealing plate 3 is put into the nut body 1 with the opening facing the top of the stop ring groove 1-3, and the disc-shaped sealing plate 3 is flattened by using the unfolding tool and the press, and the unfolded sealing plate 3 is embedded in the stop ring groove 1-3; the flat sealing plate 3 is punched into a disc-shaped structure by a deformation die 4, which provides a reliable and efficient punching structure for the reduction of the outer diameter of the sealing plate 3, has high punching efficiency, good consistency of the sealing plate 3 after punching, and is convenient for batch production;

[0034] In order to realize the reduction of the outer diameter of the sealing plate 3, so that the maximum outer diameter of the sealing plate 3 is smaller than the diameter of the opening of the stop ring groove 1-3, a deformation die 4 is specially designed, wherein the bottom plane and the conical surface of the disc-shaped groove 4-4 on the top head seat 4-1 upper end face working part are designed as a circular arc transition, and the conical surface and the bottom plane of the lower end working part of the top head 4-3 are also designed as a circular arc transition, so that the transition part is not pressed into a sharp edge when pressing the disc-shaped sealing plate 3, and the transition part has a high point when the sealing plate 3 is embedded on the nut body 1, which cannot be completely flattened, affecting the sealing effect of the indicator valve; the conical surface of the top head seat 4-1 and the outer circle, and the conical surface of the top head 4-3 and the large outer circle should have coaxiality requirements, so as to ensure the coaxiality between the two conical surfaces, the stress of each part is uniform when pressing the disc-shaped sealing plate 3, and the thickness of each part of the formed disc-shaped sealing plate 3 is uniform; the inner hole of the top head seat 4-1 and the guide sleeve 4-2 should be designed as an interference fit, so that the top head seat 4-1 is stably fixed in the inner hole of the guide sleeve 4-2, and the top head 4-3 should have a gap of 0.05-0.1mm with the inner hole of the guide sleeve 4-2, so as to guide and flexibly move when pressing the disc-shaped sealing plate 3.

[0035] The technical scheme has the advantages of simple structure, novel design, improved sealing performance of the indicator valve nut, firm embedding of the sealing plate, low processing cost, simple operation, wide application range, and high popularization value.

[0036] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0037] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A high-sealing embedded indicator valve nut for diesel engines, characterized in that: The nut body (1) is open at the bottom and closed at the top. The lower end of the nut body (1) is provided with a stepped groove (1-1) that is larger at the top and smaller at the bottom. The inner wall of the small diameter section at the bottom of the stepped groove (1-1) is provided with an internal thread (1-2) that is adapted to the external thread at the valve body port. The upper large diameter section of the stepped groove (1-1) is provided with a disc-shaped sealing plate (3) that is formed by the bottom plane and the conical surface being connected by a circular arc transition. The disc-shaped sealing plate (3) is pressed and fixed to the top of the upper large diameter section of the stepped groove (1-1) by the unfolding head (2) of the T-shaped shaft structure. After the valve body port is threadedly connected to the internal thread (1-2) of the nut body (1), the valve body end abuts against the plastically deformed sealing plate (3) to achieve sealing of the valve body port. The top of the stepped groove (1-1) has a stop ring groove (1-3) with a maximum diameter smaller than the diameter of the large diameter section of the stepped groove (1-1), and the sealing plate (3) is embedded and fixed inside the nut body (1).

2. The diesel engine high-sealing embedded indicator valve nut according to claim 1, characterized in that: The cross-sectional shape of the stop annular groove (1-3) is an inverted cone shape, the cone angle of the stop annular groove (1-3) is 90°, and the upper end groove edge of the stop annular groove (1-3) is rounded.

3. The diesel engine high-sealing embedded indicator valve nut according to any one of claims 1-2, characterized in that: The sealing plate (3) is made of copper.

4. The processing method of the high-sealing embedded indicator valve nut for diesel engines according to claim 3, characterized in that: Includes the following steps: 1) An internal thread (1-2) for matching and connecting with the external thread at the valve body port is made on the inner wall of the lower small diameter end of the stepped groove (1-1) of the nut body (1). A stop ring groove (1-3) with an inverted conical cross-section is machined at the top of the large diameter section of the stepped groove (1-1). The maximum diameter of the stop ring groove (1-3) is smaller than the diameter of the large diameter section of the stepped groove (1-1). The cone angle of the stop ring groove (1-3) is 90°. The groove edge at the upper end of the stop ring groove (1-3) is rounded. 2) Using a deformation mold (4), a circular sealing plate (3) with a diameter equivalent to the maximum diameter of the stop ring groove (1-3) is processed into a disc-shaped sealing plate (3), and the diameter of the opening end of the disc-shaped sealing plate (3) is not greater than the diameter of the lower end of the stop ring groove (1-3) and is not greater than the diameter of the internal thread (1-2). The deformation mold (4) includes a mandrel (4-1), a guide sleeve (4-2), and a mandrel (4-3). The mandrel (4-1) is interference-fitted into the inner hole of the guide sleeve (4-2), and the lower ends of the mandrel (4-1) and the guide sleeve (4-2) are located on the same plane. The upper end face of the mandrel (4-1) is provided with a dish-shaped groove (4-4). The mandrel (4-3) is a stepped shaft with an upper diameter larger than a lower diameter, and its lower end is located in the inner hole of the guide sleeve (4-2). The large diameter section of the top head (4-3) is clearance-fitted with the inner hole of the guide sleeve (4-2). The lower end of the small diameter section of the top head (4-3) is a dish head (4-5) adapted to the dish groove (4-4). After the top head (4-3) moves down to the upper and lower end surfaces of the sealing plate (3) located in the dish groove (4-4) and undergoes plastic deformation, it comes into close contact with the outer wall of the dish head (4-5) and the groove wall of the dish groove (4-4) respectively, thereby realizing the stamping and forming of the dish-shaped sealing plate (3). 3) The processed disc-shaped sealing plate (3) is inserted into the stop ring groove (1-3), and then the disc-shaped sealing plate (3) is pressed into a flat plate by the unfolding head (2) and then embedded and fixed in the nut body (1).

5. The method for processing the high-sealing embedded indicator valve nut for diesel engines according to claim 4, characterized in that: In step 3) above, the unfolding head (2) has a T-shaped shaft structure. The diameter of the small diameter section of the unfolding head (2) is the same as the diameter of the disc-shaped sealing plate (3), and the length of the small diameter section of the unfolding head (2) is greater than the sum of the depths of the stop ring groove (1-3) and the stepped groove (1-1).

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