CN218493923U

CN218493923U - Reverse oil-supplementing overflow valve with manual unloading function

Info

Publication number: CN218493923U
Application number: CN202222841639.5U
Authority: CN
Inventors: 陈磊; 卞亚琴
Original assignee: NINGBO KETA HYDRAULICS CO Ltd
Current assignee: NINGBO KETA HYDRAULICS CO Ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2023-02-17
Anticipated expiration: 2032-10-26

Abstract

The overflow valve with the manual unloading reverse oil supplement function is characterized by comprising a screw plug, a spring seat, a valve core, a valve seat, a first spring, a second spring, a check ring, a pressure relief adjusting rod and a locking nut, wherein an opening at the front end of the screw plug forms an installation cavity, and the rear end of the screw plug is axially hollow; the spring seat can be arranged in the mounting cavity of the screw plug in a sliding way; the rear end of the valve core is fixedly connected with the spring seat, and an expanded head is formed at the front end of the valve core; the valve seat can be sleeved at the front end of the valve core in a sliding mode, an oil duct is formed in the valve seat, an axial oil outlet is formed between the front end of the valve seat and the rear end face of the head of the valve core and communicated with the oil duct, and an oil inlet area is formed between the rear end face of the valve seat and the front end face of the spring seat. The utility model has the advantages of compact integral structure, simple and reliable structure, low cost, quick response when opening and closing, and manual unloading function.

Description

Reverse oil-supplementing overflow valve with manual unloading function

Technical Field

The utility model relates to an overflow valve especially relates to an overflow valve with benefit oil function.

Background

Relief valves are safety valves that control pressure in hydraulic systems. When the system works normally, the overflow valve is in a closed state, and when the system pressure is greater than the set pressure, the overflow function is started, so that the overload protection effect is realized on the system. However, if the operation speed of many actuators, such as motors, cylinders, etc., is too high, air suction occurs to form air pockets, which results in deterioration of the dynamic performance of the system and reduces the service life of the hydraulic components. Therefore, the oil supplementing function is necessary to be arranged in the hydraulic system, and most of the existing relief valves are integrated with the oil supplementing function, so that the oil supplementing relief valves are promoted.

The oil-replenishing overflow valves in the market are large in overall dimension and not suitable for being used in multi-way valve products, or are formed by assembling parts and cannot form independent functional units, so that great difficulty is brought to the mass production of engineering multi-way valves, and even the performance of the multi-way valves is unstable. In addition, the existing oil-supplementing overflow valve basically has no manual unloading function, and brings inconvenience. Therefore, the development of an oil-supplementing overflow valve with compact structure, reliable performance and manual unloading function is urgent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a reverse oil-supplementing overflow valve of taking manual uninstallation compact structure and dependable performance is provided to foretell technical current situation.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: an overflow valve with manual unloading and reverse oil supplement function is characterized by comprising

The front end of the screw plug is provided with an opening to form a mounting cavity, and the rear end of the screw plug is axially hollow;

the spring seat can be arranged in the mounting cavity of the screw plug in a sliding way;

the rear end of the valve core is fixedly connected with the spring seat, and an expanded head is formed at the front end of the valve core;

the valve seat can be sleeved at the front end of the valve core in a sliding manner, an oil duct is formed on the valve seat, an axial oil outlet is formed between the front end of the valve seat and the rear end face of the head of the valve core, the oil outlet is communicated with the oil duct, and an oil inlet area is formed between the rear end face of the valve seat and the front end face of the spring seat;

the first spring is sleeved outside the valve core, the front end of the first spring is abutted against the valve seat, and the rear end of the first spring is abutted against the front end face of the spring seat;

the second spring is arranged in the mounting cavity of the screw plug, and the front end of the second spring is abutted against the rear end face of the spring seat;

the retainer ring is arranged on the inner side of the mounting cavity of the screw plug and can limit the spring seat to be separated from the screw plug;

the pressure relief adjusting rod is arranged at the rear end of the screw plug in a transversely movable manner and can drive the valve plug to move forwards; and

and the locking nut is arranged on the rear end face of the screw plug and can lock the pressure relief adjusting rod.

Preferably, the second spring is a tower spring, and the narrow opening of the tower spring abuts against the spring seat and the wide opening abuts against the inner wall of the screw plug.

Further, the rear end of the valve seat has a sleeve portion that is in guide fit with the outer wall of the valve element. The starting is stable and has no squeal.

The cross section of the retainer ring is circular. Even if the first spring works in a telescopic mode, the first spring scrapes, point contact of the circular section can be centered and reset under the guide of the valve seat.

The spring seat is in threaded connection with the valve core, and a cylindrical riveting part is formed at the rear end of the spring seat and is riveted on the outer wall of the valve core. The overflow valve can be prevented from drifting to failure due to pressure loss caused by loosening of threads in long-term operation.

Preferably, the rear end surface of the head portion has a convex spherical shape.

Preferably, the front end surface of the valve seat is formed in a convex spherical shape.

Preferably, the cross section of the valve seat is in regular hexagon and is in guide fit with the base hole.

Further, the inner cavity of the valve seat is cut to form an oil cavity, and the oil cavity is connected with an oil duct and an oil inlet.

Compared with the prior art, the utility model has the advantages of: compact structure, it is simple reliable, with low costs, it is fast to open and close quick response, still possesses manual uninstallation function.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment.

Fig. 2 is an enlarged sectional view of the valve seat in the embodiment.

Fig. 3 is an enlarged sectional view of the valve seat in the embodiment.

FIG. 4 is a reference diagram of the usage status of the embodiment.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1, the relief valve with manual unloading and reverse oil replenishment in this embodiment includes a plug screw 1, a spring seat 6, a valve core 4, a valve seat 5, a first spring 7, a second spring 8, a retainer ring 9, a pressure relief adjusting rod 2 and a lock nut 3.

An opening at the front end of the screw plug 1 forms a mounting cavity, and the rear end of the screw plug is axially hollow; the spring seat 6 is slidably provided in the mounting cavity of the plug screw 1.

As shown in fig. 2, the rear end of the valve body 4 is fixedly connected to the spring seat 6, and an enlarged head 41 is formed at the front end. The valve seat 5 is slidably sleeved at the front end of the valve element 4, an oil passage 52 is formed on the valve seat 5, an axial oil outlet 1b is formed between the front end of the valve seat 5 and the rear end face of the head 41 of the valve element 4, the oil outlet 1b is communicated with the oil passage 52, and an oil inlet area 1a is formed between the rear end face of the valve seat 5 and the front end face of the spring seat 6. The valve seat 5 is internally grooved to form an oil chamber 53, and the oil chamber 53 connects the oil passage 52 and the oil outlet 1b. The oil chamber 53 ensures an overflow flow area. If only the valve core is adopted to cut the groove, the strength and the rigidity of the valve core are greatly weakened, and the working stability of the overflow valve core is seriously influenced. As shown in fig. 3, the valve seat 5 has a regular hexagonal cross-section and is capable of guiding engagement with the base hole. In the embodiment, the hexagonal edge of the outer diameter of the valve seat is chamfered, oil is guided by drilling, and the radial six points and the base hole are loosely matched for guiding, so that the situation that an oil way is communicated and the valve fails to work due to the fact that the valve seat is difficult to center and reset after oil is supplemented and the valve seat is displaced is prevented.

The first spring 7 is sleeved outside the valve core 4, the front end of the first spring abuts against the valve seat 5, and the rear end of the first spring abuts against the front end face of the spring seat 6; the second spring 8 is arranged in the mounting cavity of the screw plug 1, and the front end of the second spring is abutted against the rear end face of the spring seat 6; specifically, the second spring 8 in this embodiment is a tower spring, which is stable in centering and large in compression amount, and the narrow opening of the tower spring abuts against the spring seat 6 and the wide opening abuts against the inner wall of the screw plug 1.

The retainer ring 9 is arranged on the inner side of the mounting cavity of the screw plug 1 and can limit the spring seat 6 to be separated from the screw plug 1; retaining ring 9 can restrict the subassembly that first spring, case, disk seat and spring holder formed and break away from the plug screw, realizes floating mount, reduces operation requirement, keeps apart vibration conduction. The cross section of the retainer ring 9 in the embodiment is circular, and the first spring can be centered and reset under the guide of the valve seat even if the first spring is used for stretching and scraping.

The pressure relief adjusting rod 2 is arranged at the rear end of the screw plug 1 in a transversely movable manner and can drive the valve core 4 to move forwards; the locking nut 3 is arranged on the rear end face of the screw plug 1 and can lock the pressure relief adjusting rod 2.

The rear end of the valve seat 5 has a sleeve portion 51, and the sleeve portion 51 is in guide engagement with the outer wall of the valve body 4. The valve seat is opened stably without squeaking.

The spring seat 6 is screwed to the valve body 4, and a cylindrical caulking portion 61 is formed at the rear end of the spring seat 6, and the caulking portion 61 is caulked to the outer wall of the valve body 4. The overflow valve can be prevented from drifting to failure due to pressure loss caused by loosening of threads in long-term operation.

The rear end surface of the head 41 has a convex spherical shape. The front end surface 54 of the valve seat 5 is formed in a convex spherical shape. The spherical sealing design ensures wide sealing band, less internal leakage, good wear resistance, good impact resistance, good fatigue resistance, good reliability and long service life.

As shown in a combined figure 4, an oil inlet area 1a is communicated with an oil inlet of an application occasion, and the working principle is as follows:

the valve core presses the valve seat through the first spring, the pressure of the oil inlet area 1a rises, oil enters the oil cavity from the oil duct, the pressure exceeds the set pressure of the first spring, the valve core 1 is separated from the valve seat 2, the oil overflows and is discharged to the oil outlet, the pressure of the oil in the oil inlet area 1a drops, the first spring force overcomes the oil pressure, the valve core and the valve seat are closed, and the function of the overflow valve is achieved.

The check valve oil supplementing function is that when the pressure of the oil outlet is larger than the pressure of the oil inlet area 1a, an integral component formed by the valve core, the valve seat, the first spring and the spring seat overcomes the preset force of the second spring and is separated from the valve hole base, and oil flows to the oil inlet area 1a from the oil outlet, so that the check valve oil supplementing function is achieved.

And a manual unloading function, wherein when the abnormal overflow function cannot work normally, the pressure relief adjusting rod is screwed on and is lifted away from the valve seat, the oil in the oil inlet area 1a is discharged to the oil outlet, and the manual unloading function is realized.

Claims

1. An overflow valve with manual unloading and reverse oil supplement functions is characterized by comprising

The screw plug (1) is provided with an opening at the front end to form a mounting cavity and is axially hollow at the rear end;

a spring seat (6) which is slidably provided in the mounting cavity of the plug screw (1);

the rear end of the valve core (4) is fixedly connected with the spring seat (6), and an expanded head (41) is formed at the front end;

the valve seat (5) is sleeved at the front end of the valve core (4) in a sliding manner, an oil duct (52) is formed on the valve seat (5), an axial oil outlet (1 b) is formed between the front end of the valve seat (5) and the rear end face of the head (41) of the valve core (4), the oil outlet (1 b) is communicated with the oil duct (52), and an oil inlet area (1 a) is formed between the rear end face of the valve seat (5) and the front end face of the spring seat (6);

the first spring (7) is sleeved outside the valve core (4), the front end of the first spring is abutted against the valve seat (5), and the rear end of the first spring is abutted against the front end face of the spring seat (6);

the second spring (8) is arranged in the mounting cavity of the screw plug (1), and the front end of the second spring is abutted against the rear end face of the spring seat (6);

the retainer ring (9) is arranged on the inner side of the installation cavity of the screw plug (1) and can limit the spring seat (6) from being separated from the screw plug (1);

the pressure relief adjusting rod (2) is arranged at the rear end of the screw plug (1) in a transversely movable manner and can drive the valve plug (4) to move forwards; and

and the locking nut (3) is arranged on the rear end face of the screw plug (1) and can lock the pressure relief adjusting rod (2).

2. The relief valve with manual unloading and reverse oil replenishing functions of claim 1, wherein the second spring (8) is a tower spring, the narrow opening of the tower spring abuts against the spring seat (6), and the wide opening of the tower spring abuts against the inner wall of the screw plug (1).

3. The relief valve with manual relief and reverse oil replenishment according to claim 1, wherein the rear end of the valve seat (5) has a sleeve portion (51), and the sleeve portion (51) is in guiding engagement with the outer wall of the valve body (4).

4. The relief valve with manual unloading and reverse oil filling of claim 1 is characterized in that the cross section of the retainer ring (9) is circular.

5. The relief valve with manual unloading and reverse oil replenishing according to claim 1, wherein the spring seat (6) is screwed to the valve body (4), and a cylindrical rivet (61) is formed at the rear end of the spring seat (6), and the rivet (61) is riveted to the outer wall of the valve body (4).

6. The relief valve with manual unloading and reverse oil supply of claim 1 wherein the rear end face of the head (41) is convex spherical.

7. The relief valve with manual unloading and reverse oil supply of claim 1 wherein the front end face (54) of the valve seat (5) is convex spherical.

8. The relief valve with manual unloading and reverse oil filling function according to claim 1 is characterized in that the cross section of the valve seat (5) is in a regular hexagon shape and can be in guiding fit with a base hole.

9. The relief valve with manual relief and reverse oil replenishment according to claim 1, wherein the valve seat (5) is cut in its inner cavity to form an oil chamber (53), and the oil chamber (53) connects the oil passage (52) and the oil outlet (1 b).