CN221220982U

CN221220982U - Pilot-operated unloading safety valve

Info

Publication number: CN221220982U
Application number: CN202323036876.5U
Authority: CN
Inventors: 田富刚; 杨其军
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-11-09
Filing date: 2023-11-09
Publication date: 2024-06-25
Anticipated expiration: 2033-11-09

Abstract

The utility model belongs to the technical field of hydraulic cylinder unloading, and particularly relates to a pilot type unloading safety valve, which comprises a first valve body, wherein a cavity I is formed in the first valve body, and a through hole and an oil return hole I are formed in the front end of the cavity I; a high-pressure valve core assembly for blocking the oil return hole I and the through hole I is arranged in the cavity I; the installation department has been seted up to first valve body front end, installs low pressure valve mechanism on the installation department, and low pressure valve mechanism has at least: the second valve body is in threaded connection with the mounting part, a cavity II communicated with the through hole is formed in the second valve body, and an oil inlet hole and an oil return hole II are formed in the second valve body; the low-pressure valve core assembly is arranged in the second cavity, an oil passing gap is reserved between the low-pressure valve core assembly and the side wall of the second cavity, and the front end of the low-pressure valve core assembly is movably sealed in the second oil return hole; the first valve body and the second valve body are connected together through threads, and when a high-pressure valve core assembly and a low-pressure valve core assembly are in a problem, the first valve body and the second valve body can be separated through threads, so that the high-pressure valve core assembly is convenient to detach and maintain.

Description

Pilot-operated unloading safety valve

Technical Field

The utility model relates to the technical field of hydraulic cylinder unloading, in particular to a pilot type unloading safety valve.

Background

The safety valve is a valve for protecting system pressure, and once the medium pressure in a system pipeline or device exceeds a set value, the pressure is automatically released, so that the aim of safety protection is fulfilled, and as disclosed in Chinese patent publication No. CN201420851150.9, the pilot-operated safety valve comprises a main valve body, an oil inlet, an oil return port, a one-way valve and a slide valve, pressure oil is enabled to rise through a damping hole of the slide valve and a radial fit clearance with the one-way valve, so that the hydraulic oil pressure in an inner cavity of the one-way valve is also increased along with the damping hole, after the pressure value is initially set by overcoming a pressure regulating spring, the hydraulic oil pushes the lifting valve to move right to open the pilot port, so that the pressure in the inner cavity of the one-way valve is reduced, the one-way valve moves right, the oil inlet is communicated with the oil return port, and oil flows back to the oil tank from the oil return port, so that the overload protection and the pressure balance effect of the system are realized;

The pressure relief mode has some defects: the main valve body is integrally formed, if problems occur in the safety valve, such as part aging and damage and part dislocation, the whole valve core needs to be detached for maintenance, so that maintenance becomes difficult and the detachment is complicated.

Disclosure of utility model

The utility model aims to provide a pilot type unloading safety valve, wherein a first valve body and a second valve body are connected together through threads, so that the problems that the whole valve core is difficult to repair and complex to detach after the main valve body is integrally formed are solved.

The purpose of the utility model is realized in the following way:

a pilot-operated unloading safety valve, comprising:

The first valve body is internally provided with a first cavity, the front end of the first cavity is provided with a through hole, and the outer wall of the first valve body is provided with a first oil return hole for conducting the first cavity; a high-pressure valve core assembly is arranged in the first cavity and used for blocking the oil return hole I and the through hole;

The installation department has been seted up to first valve body front end, install low pressure valve mechanism on the installation department, low pressure valve mechanism has at least:

The second valve body is in threaded connection with the mounting part, a second cavity communicated with the through hole is formed in the second valve body, and an oil inlet hole and a second oil return hole are formed in the second valve body;

The low-pressure valve core assembly is arranged in the second cavity, an oil passing gap is reserved between the low-pressure valve core assembly and the side wall of the second cavity, and the front end of the low-pressure valve core assembly is movably sealed in the second oil return hole.

Preferably, the low pressure spool assembly includes:

The low-pressure valve sleeve is movably arranged in the second cavity, the oil passing gap is formed between the outer wall of the low-pressure valve sleeve and the two side walls of the second cavity, and the front end of the low-pressure valve sleeve is provided with a valve ball part for sealing the second oil return hole;

The low-pressure spring is arranged in the second cavity; the end part of the low-pressure spring is abutted against the low-pressure valve sleeve, so that the oil return hole II is sealed by the low-pressure valve sleeve.

Preferably, an annular boss is arranged on the inner wall of the front end of the low-pressure valve sleeve, and a low-pressure valve needle is arranged on the annular boss; the rear end of the low-pressure valve needle extends into the low-pressure valve sleeve, and the front end of the low-pressure valve needle is provided with the valve ball part; the low-pressure spring is sleeved on the low-pressure valve needle which stretches into the low-pressure valve sleeve, and the upper end of the low-pressure spring is abutted against the end face of the annular boss.

Preferably, the front end of the low-pressure valve needle is provided with a mounting groove in a molding mode, and a valve ball is embedded in the mounting groove; an outer wall portion of the valve ball protrudes from the mounting groove, thereby forming the valve ball portion.

Preferably, the front end of the low-pressure valve needle is provided with a first projection, and the front end of the low-pressure valve sleeve is formed with a limit groove; and when the first protrusion is arranged in the limiting groove, the shaking of the low-pressure valve needle in the low-pressure valve sleeve is reduced.

Preferably, a sealing gasket is arranged between the front end of the first valve body and the rear end of the second valve body, and the through hole is formed in the sealing gasket.

Preferably, a sealing ring is arranged between the second valve body and the sealing gasket, and the sealing ring is a red copper gasket.

Preferably, the high pressure spool assembly includes:

The high-pressure valve sleeve is movably arranged in the first cavity, and the front end of the high-pressure valve sleeve is provided with a high-pressure valve needle for sealing the through hole; the front end of the high-pressure valve needle is provided with a second protrusion, and the second protrusion is abutted against the front end of the high-pressure valve sleeve;

A high pressure spring mounted within the cavity one; the end part of the high-pressure spring is abutted against the high-pressure valve sleeve, so that the high-pressure valve sleeve seals the through hole and the oil return hole I.

Preferably, a pressure regulating nut is arranged at the rear end of the first valve body, and the high-pressure spring is abutted against the pressure regulating nut; and the force adjustment of the high-pressure valve needle abutting the through hole is realized by adjusting the position of the pressure regulating nut on the first valve body.

Preferably, the rear end of the high-pressure valve needle extends into the high-pressure valve sleeve and the pressure regulating nut, and the high-pressure spring is sleeved on the high-pressure valve needle.

Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

1. The utility model designs the first valve body and the second valve body which are connected together through the threads, when the high-pressure valve core component and the low-pressure valve core component have problems, the first valve body and the second valve body can be separated through the threads, and the disassembly and the maintenance are convenient.

2. The hydraulic oil flows out from the oil return hole I after reaching the pressure set by the high-pressure valve core assembly, the pressure between the rear end of the low-pressure valve sleeve and the sealing gasket is reduced, the hydraulic oil pushes the low-pressure valve sleeve to move backwards, the hydraulic oil flows out from the oil return hole II, the pressure of the hydraulic oil can be relieved without reaching the pressure set by the high-pressure valve core assembly, and therefore equipment such as a motor can work under a smaller load, and the service life of the equipment such as the motor is prolonged.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a cross-sectional view of the present utility model.

Fig. 3 is an exploded view of the present utility model.

Reference numerals: 1. a first valve body; 11. a first cavity; 12. an oil return hole I; 13. a mounting part; 15. a pressure regulating nut;

2. A second valve body; 21. a cavity II; 22. an oil inlet hole; 23. oil return holes II;

3. A sealing gasket; 31. a through hole; 32. a seal ring;

4. a low pressure valve sleeve; 41. a valve ball portion; 42. an annular boss; 43. a limit groove;

5. A low pressure spring; 6. a low pressure valve needle; 61. a mounting groove; 62. a valve ball; 63. a first bulge;

7. A high pressure valve sleeve; 8. a high-pressure spring; 9. a high pressure valve needle; 91. and a second protrusion.

Detailed Description

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, a pilot-operated unloading safety valve includes: the hydraulic oil hydraulic valve comprises a first valve body 1, a second valve body 1, a first valve body and a second valve body, wherein a cavity I11 is formed in the first valve body, a through hole 31 is formed in the front end of the cavity I11, an oil return hole I12 for conducting the cavity I11 is formed in the outer wall of the first valve body 1, and hydraulic oil can flow out of the cavity I11 through the oil return hole I12; a high-pressure valve core assembly is arranged in the first cavity 11 and is used for blocking the first oil return hole 12 and the through hole 31;

As shown in fig. 2, the front end of the first valve body 1 is provided with a mounting portion 13, and the mounting portion 13 is provided with a low-pressure valve mechanism, which at least comprises: a second valve body 2, a low pressure spool assembly; the second valve body 2 is in threaded connection with the mounting part 13, a second cavity 21 communicated with the through hole 31 is formed in the second valve body 2, an oil inlet hole 22 and an oil return hole 23 are formed in the second valve body 2, the oil inlet hole 22 is communicated with the second cavity 21, hydraulic oil can flow into the second cavity 21 from the oil inlet hole 22, the oil return hole 23 is communicated with the second cavity 21, and hydraulic oil in the second cavity 21 can flow out from the second oil return hole 23; the low-pressure valve core assembly is arranged in the cavity II 21, the cavity II 21 is divided into a front cavity and a rear cavity, an oil passing gap is reserved between the side wall of the low-pressure valve core assembly and the side wall of the cavity II 21, and the front end of the low-pressure valve core assembly is movably sealed to the oil return hole II 23.

Referring to fig. 2 and 3, the low pressure spool assembly includes: the low-pressure valve sleeve 4 and the low-pressure spring 5 are arranged in the cavity II 21 in a movable mode, an oil passing gap is formed between the outer wall of the low-pressure valve sleeve 4 and the side wall of the cavity II 21, and a valve ball part 41 for sealing the oil return hole II 23 is arranged at the front end of the low-pressure valve sleeve 4; the low-pressure spring 5 is arranged in the cavity II 21; the two ends of the low-pressure spring 5 are respectively abutted against the low-pressure valve sleeve 4 and the sealing ring 32, so that the oil return hole II 23 is sealed by the low-pressure valve sleeve 4.

Referring to fig. 2 and 3, an annular boss 42 is provided on the inner wall of the front end of the low pressure valve sleeve 4, and a low pressure valve needle 6 is mounted on the annular boss 42; the rear end of the low-pressure valve needle 6 extends into the low-pressure valve sleeve 4, and the front end is provided with a valve ball part 41; the low-pressure spring 5 is sleeved on the low-pressure valve needle 6 extending into the low-pressure valve sleeve 4, and the upper end of the low-pressure spring 5 extends into the low-pressure valve sleeve 4 and abuts against the end face of the annular boss 42.

With reference to fig. 2 and 3, the front end of the low-pressure valve needle 6 is formed with a mounting groove 61, a valve ball 62 is embedded in the mounting groove 61, the valve ball 62 is a steel ball, the ball is convenient to manufacture, and the oil return hole two 23 can be plugged more easily; the outer wall portion of the valve ball 62 protrudes out of the mounting groove 61, thereby forming the valve ball portion 41.

Referring to fig. 2 and 3, a first protrusion 63 is provided at the front end of the low pressure valve needle 6, and a limit groove 43 is formed at the front end of the low pressure valve sleeve 4; when the first projection 63 is placed in the limit groove 43, the sloshing of the low pressure needle 6 in the low pressure valve housing 4 is reduced.

As shown in fig. 2, a sealing gasket 3 is arranged between the front end of the first valve body 1 and the rear end of the second valve body 2, and the sealing gasket 3 is provided with a through hole 31; a sealing ring 32 is arranged between the second valve body 2 and the sealing gasket 3, the sealing ring 32 is a red copper gasket or a clamping spring, and the sealing ring 32 further prevents hydraulic oil from leaking from the threaded connection part of the first valve body 1 and the second valve body 2.

As shown in fig. 2, the high pressure spool assembly includes: a high-pressure valve housing 7 and a high-pressure spring 8; the high-pressure valve sleeve 7 is movably arranged in the first cavity 11, and the front end of the high-pressure valve sleeve 7 is provided with a high-pressure valve needle 9 for sealing the through hole 31; the front end of the high-pressure valve needle 9 is provided with a second protrusion 91, and the second protrusion 91 is abutted against the front end of the high-pressure valve sleeve 7; a high-pressure spring 8 mounted in the cavity one 11; the end part of the high-pressure spring 8 is abutted against the high-pressure valve sleeve 7, so that the high-pressure valve sleeve 7 seals the through hole 31 and the oil return hole I12; the front end of the high pressure needle 9 may be fitted with a ball as the front end of the low pressure needle 6.

Referring to fig. 2 and 3, the rear end of the first valve body 1 is connected with a pressure regulating nut 15 through threads, and the high pressure spring 8 abuts against the pressure regulating nut 15; the force adjustment of the high-pressure valve needle 9 against the through hole 31 is realized by adjusting the position of the pressure adjusting nut 15 on the first valve body 1, so that the pressure standard of the pressure relief of the first valve body 1 can be set according to the actual use condition.

The rear end of the high-pressure valve needle 9 stretches into the high-pressure valve sleeve 7 and the pressure regulating nut 15, the high-pressure spring 8 is sleeved on the high-pressure valve needle 9, when hydraulic oil pushes the high-pressure valve needle 9, the high-pressure valve needle 9 can move in the pressure regulating nut 15, and the pressure regulating nut 15 can ensure that the high-pressure valve sleeve 7 only moves axially in the first cavity 11.

The working principle of the safety valve is specifically disclosed in Chinese patent publication No. CN 205823774U.

The specific working process of the scheme is as follows:

The first valve body 1 and the second valve body 2 are connected together through threads, hydraulic oil flows into the front cavity from the oil inlet hole 22, because an oil passing gap is formed between the outer wall of the low-pressure valve sleeve 4 and the side wall of the cavity II 21, hydraulic oil flows into the rear cavity from the oil passing gap, the high-pressure valve needle 9 is in contact with the through hole 31 because the high-pressure spring 8, hydraulic oil does not flow out of the oil return hole I12, at the moment, the pressure of the front cavity is the same with that of the rear cavity, and the hydraulic oil in the front cavity cannot enable the low-pressure valve sleeve 4 to move backwards; the hydraulic oil continuously flows into the rear cavity from the oil passing gap, so that the pressure at the front end of the high-pressure valve sleeve 7 is larger than the elastic force of the high-pressure spring 8, the hydraulic oil pushes the high-pressure valve sleeve 7 to move backwards, and finally the hydraulic oil flows out through an oil return hole I12 of the cavity I11; when hydraulic oil flows out from the oil return hole I12, the speed of the hydraulic oil flowing out from the oil return hole I12 is far greater than the speed of the hydraulic oil flowing into the rear cavity from the oil passing gap, so that the pressure of the rear end of the low-pressure valve sleeve 4 is weakened, the force of the hydraulic oil in the front cavity, which is abutted against the front end of the low-pressure valve sleeve 4, is greater than that of the rear end of the low-pressure valve sleeve 4, the force of the rear end of the low-pressure valve sleeve 4 comprises the pressure of the hydraulic oil in the rear cavity and the elasticity of the low-pressure spring 5, the hydraulic oil flows into the front cavity from the oil inlet hole 22 and pushes the low-pressure valve sleeve 4 to move backwards, the oil return hole II 23 is opened, and the hydraulic oil can flow out from the oil return hole II 23 at the moment.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A pilot-operated unloading safety valve, comprising:

The valve comprises a first valve body (1), wherein a first cavity (11) is formed in the first valve body, a through hole (31) is formed in the front end of the first cavity (11), and an oil return hole (12) for conducting the first cavity (11) is formed in the outer wall of the first valve body (1); a high-pressure valve core assembly is arranged in the first cavity (11) and is used for blocking the first oil return hole (12) and the through hole (31);

The front end of the first valve body (1) is provided with an installation part (13), the installation part (13) is provided with a low-pressure valve mechanism, and the low-pressure valve mechanism at least comprises:

The second valve body (2) is in threaded connection with the mounting part (13), a cavity II (21) communicated with the through hole (31) is formed in the second valve body, and an oil inlet hole (22) and an oil return hole II (23) are formed in the second valve body (2);

The low-pressure valve core assembly is arranged in the cavity II (21), an oil passing gap is reserved between the low-pressure valve core assembly and the side wall of the cavity II (21), and the front end of the low-pressure valve core assembly is movably sealed in the oil return hole II (23).

2. The pilot-operated unloading safety valve of claim 1, wherein:

the low pressure spool assembly includes:

The low-pressure valve sleeve (4) is movably arranged in the cavity II (21), an oil passing gap is formed between the outer wall of the low-pressure valve sleeve (4) and the side wall of the cavity II (21), and a valve ball part (41) for sealing the oil return hole II (23) is arranged at the front end of the low-pressure valve sleeve (4);

A low-pressure spring (5) which is arranged in the cavity II (21); the end part of the low-pressure spring (5) is abutted against the low-pressure valve sleeve (4), so that the oil return hole II (23) is sealed by the low-pressure valve sleeve (4).

3. The pilot-operated unloading safety valve of claim 2, wherein:

an annular boss (42) is arranged on the inner wall of the front end of the low-pressure valve sleeve (4), and a low-pressure valve needle (6) is arranged on the annular boss (42); the rear end of the low-pressure valve needle (6) extends into the low-pressure valve sleeve (4), and the front end of the low-pressure valve needle is provided with the valve ball part (41); the low-pressure spring (5) is sleeved on the low-pressure valve needle (6) extending into the low-pressure valve sleeve (4), and the upper end of the low-pressure spring (5) is abutted against the end face of the annular boss (42).

4. A pilot-operated unloading safety valve as defined in claim 3, wherein:

The front end of the low-pressure valve needle (6) is provided with a mounting groove (61), and a valve ball (62) is embedded in the mounting groove (61); an outer wall portion of the valve ball (62) protrudes from the mounting groove (61), thereby forming the valve ball portion (41).

5. The pilot-operated unloading safety valve of claim 4, wherein:

The front end of the low-pressure valve needle (6) is provided with a first bulge (63), and the front end of the low-pressure valve sleeve (4) is provided with a limiting groove (43); when the first projection (63) is placed in the limit groove (43), the shaking of the low-pressure valve needle (6) in the low-pressure valve sleeve (4) is reduced.

6. A pilot operated unloading safety valve according to claim 4 or 5, characterized in that:

A sealing gasket (3) is arranged between the front end of the first valve body (1) and the rear end of the second valve body (2), and the sealing gasket (3) is provided with the through hole (31).

7. The pilot-operated unloading safety valve of claim 6, wherein:

a sealing ring (32) is arranged between the second valve body (2) and the sealing gasket (3), and the sealing ring (32) is a red copper gasket.

8. The pilot-operated unloading safety valve of claim 7, wherein:

The high pressure spool assembly includes:

the high-pressure valve sleeve (7) is movably arranged in the first cavity (11), and the front end of the high-pressure valve sleeve (7) is provided with a high-pressure valve needle (9) for sealing the through hole (31); the front end of the high-pressure valve needle (9) is provided with a second protrusion (91), and the second protrusion (91) is abutted against the front end of the high-pressure valve sleeve (7);

A high-pressure spring (8) mounted in the cavity one (11); the end part of the high-pressure spring (8) is abutted against the high-pressure valve sleeve (7), so that the high-pressure valve sleeve (7) seals the through hole (31) and the oil return hole I (12).

9. The pilot-operated unloading safety valve of claim 8, wherein:

The rear end of the first valve body (1) is provided with a pressure regulating nut (15), and the high-pressure spring (8) is abutted against the pressure regulating nut (15); the force adjustment of the high-pressure valve needle (9) abutting against the through hole (31) is realized by adjusting the position of the pressure adjusting nut (15) on the first valve body (1).

10. The pilot-operated unloading safety valve of claim 9, wherein:

the rear end of the high-pressure valve needle (9) stretches into the high-pressure valve sleeve (7) and the pressure regulating nut (15), and the high-pressure spring (8) is sleeved on the high-pressure valve needle (9).