Novel oil return safety valve

Abstract

The utility model belongs to the technical field of valve bodies, in particular to a novel oil return safety valve, which comprises a valve body, an abutting piece, a spring, a valve needle and a safety valve plate, the valve body is provided with an oil inlet and an oil return port, the abutting piece and the safety valve plate are respectively positioned at the oil inlet and the oil return port, the spring and the valve needle are positioned in the valve body, and the safety valve plate is positioned at the oil return port. The safety valve plate is provided with an oil inlet hole, one end of the valve needle abuts against the oil inlet hole of the safety valve plate, the two ends of the spring make contact with the valve needle and the abutting piece respectively, the oil inlet hole is always closed by the valve needle through the elastic force of the spring, and the abutting piece is provided with an oil outlet hole. And the novel oil return safety valve is long in service life.

Description

Technical Field

[0001] This utility model belongs to the field of valve body technology, and specifically refers to a new type of return oil safety valve. Background Technology

[0002] Electric hydraulic tools typically include split-type hydraulic tools such as electric hydraulic pliers, hydraulic wrenches, hydraulic electric oil pumps, hydraulic jacks, hydraulic bolt tensioners, hydraulic hole saws, hydraulic flange separators, hydraulic nut cutters, and hydraulic pullers. Most of these hydraulic tools require a return oil safety valve to discharge high internal oil pressure and prevent damage. However, most return oil safety valves on the market have their oil outlets perpendicular to the valve body, requiring the oil to bend during discharge. This can easily lead to the accumulation of impurities inside, affecting spring performance and shortening the valve's lifespan. Summary of the Invention

[0003] The purpose of this invention is to provide a new type of oil return safety valve that has a simple structure, is not prone to impurity accumulation, and has a long service life.

[0004] The purpose of this utility model is achieved as follows:

[0005] A novel return oil safety valve includes a valve body, a stop member, a spring, a valve needle, and a safety valve plate. The valve body has an oil inlet and an oil return port. The stop member and the safety valve plate are located at the oil inlet and the oil return port, respectively. The spring and the valve needle are located inside the valve body, and one end of the valve needle abuts against the oil inlet of the safety valve plate. Both ends of the spring are in contact with the valve needle and the stop member, respectively. The valve needle always closes the oil inlet port by means of the spring force. The stop member is provided with an oil outlet.

[0006] In the aforementioned novel oil return safety valve, the central axis of the oil inlet coincides with the central axis of the oil outlet.

[0007] In the aforementioned novel oil return safety valve, a locking element is provided at one end of the valve body near the abutment, and the locking element passes through the valve body and abuts against the abutment.

[0008] In the aforementioned novel return oil safety valve, the valve body and the abutment are connected to each other via a threaded connection.

[0009] In the aforementioned novel oil return safety valve, the valve body is provided with an external hexagonal column and an external thread, the external hexagonal column being located near the oil return port and the external thread being located near the oil inlet port.

[0010] In the aforementioned novel return oil safety valve, the valve needle has a columnar structure and includes a sealing section, a liquid passage section, and a needle tip section. The sealing section is clearance-fitted with the inner side of the valve body. The liquid passage section is provided with multiple flat grooves, and the flat grooves are left with a gap from the inner side of the valve body. The needle tip section extends at least partially into the oil inlet hole.

[0011] In the aforementioned novel return oil safety valve, a conical head is provided at the end of the needle section facing the safety valve plate.

[0012] In the aforementioned novel oil return safety valve, the abutment is also provided with an internal hexagonal socket.

[0013] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0014] When the internal pressure increases, the oil enters through the inlet and pushes the valve needle toward the abutment. At the same time, the oil is discharged from the holes on the periphery of the valve needle. Since the valve body is close to a cylindrical structure, the oil discharge is relatively simple and there is no bend. Impurities are not easy to accumulate in the valve body. When the internal pressure decreases, the spring pushes the valve needle to re-close the inlet, which extends the service life of the valve body and the overall structure is relatively simple. Attached Figure Description

[0015] Figure 1 This is a simplified structural diagram of the present invention.

[0016] Figure 2 This is a cross-sectional view of the present invention.

[0017] Figure 3 This is an exploded cross-sectional view of this utility model.

[0018] Figure 4 This is a schematic diagram of the valve needle of this utility model.

[0019] 1-Valve body; 2-Abutting part; 3-Spring; 4-Valve needle; 5-Safety valve plate; 6-Locking part;

[0020] 11-Oil inlet; 12-Oil return port; 21-Oil outlet; 22-Internal hexagonal socket; 41-Sealing section; 42-Liquid passage section;

[0021] 43-Needle section; 44-Flat groove; 45-Conical head; 51-Oil inlet hole; 101-External hexagonal column; 102-External thread. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] like Figures 1-4As shown: A novel return oil safety valve includes a valve body 1, abutment 2, spring 3, valve needle 4, and safety valve plate 5. The valve body 1 has an oil inlet 11 and an oil return port 12. The abutment 2 and safety valve plate 5 are located at the oil inlet 11 and the oil return port 12, respectively. The spring 3 and valve needle 4 are located inside the valve body 1, with one end of the valve needle 4 abutting against the oil inlet 51 of the safety valve plate 5. Both ends of the spring 3 are in contact with the valve needle 4 and the abutment 2, respectively, and the valve needle 4 is secured by the spring 3. The force always seals the oil inlet hole 51. The abutment 2 is provided with an oil outlet hole 21. The central axis of the oil inlet hole 51 coincides with the central axis of the oil outlet hole 21. Specifically, after the oil enters through the oil inlet hole, it pushes the valve needle to move toward the abutment. At the same time, the oil will be discharged from the holes on the periphery of the valve needle. Since the valve body is close to a cylindrical structure, the oil discharge is relatively simple and there will be no bend. The oil can wash away impurities, and impurities are not easy to accumulate in the valve body, thus extending the service life of the valve body.

[0024] In the aforementioned novel oil return safety valve, a locking element 6 is provided at one end of the valve body 1 near the abutment 2. The locking element 6 passes through the valve body 1 and abuts against the abutment 2. Specifically, this is to prevent the abutment from shifting under high pressure. The locking element is designed to prevent the abutment from shifting.

[0025] In the aforementioned novel oil return safety valve, the valve body 1 and the abutment 2 are connected to each other by a threaded connection, specifically, this is to facilitate the disassembly and assembly of the abutment.

[0026] In the aforementioned novel oil return safety valve, the valve body 1 is provided with an external hexagonal column 101 and an external thread 102. The external hexagonal column 101 is located near the oil return port 12, and the external thread 102 is located near the oil inlet port 11. Specifically, this is for the convenience of installation.

[0027] In the aforementioned novel return oil safety valve, the valve needle 4 has a columnar structure and includes a sealing section 41, a liquid passage section 42, and a needle section 43. The sealing section 41 is clearance-fitted with the inner surface of the valve body 1. The liquid passage section 42 is provided with multiple flat grooves 44, and the flat grooves 44 are left with a gap from the inner surface of the valve body 1. The needle section 43 extends at least partially into the oil inlet hole 51. Specifically, the designed gap is to facilitate the entry of oil into the gap and push the valve needle toward the abutment, so as to facilitate the return of oil from the oil outlet hole.

[0028] In the aforementioned novel oil return safety valve, the end of the needle section 43 facing the safety valve plate 5 is provided with a conical head 45. Specifically, this is to facilitate the insertion of the needle section into the oil inlet hole of the safety valve plate, thereby completing the sealing.

[0029] In the aforementioned novel oil return safety valve, the abutment 2 is also provided with an internal hexagon 22, specifically, this is to facilitate the disassembly and assembly of the abutment.

[0030] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A novel return oil safety valve, characterized in that: The valve body (1) includes a valve body (1), abutment (2), spring (3), valve needle (4), and safety valve plate (5). The valve body (1) has an oil inlet (11) and an oil return port (12). The abutment (2) and safety valve plate (5) are located at the oil inlet (11) and the oil return port (12), respectively. The spring (3) and valve needle (4) are located inside the valve body (1), and one end of the valve needle (4) abuts against the oil inlet (51) of the safety valve plate (5). The two ends of the spring (3) are in contact with the valve needle (4) and the abutment (2), respectively. The valve needle (4) always closes the oil inlet (51) with the help of the elastic force of the spring (3). The abutment (2) is provided with an oil outlet (21).

2. The novel return oil safety valve according to claim 1, characterized in that: The central axis of the oil inlet (51) coincides with the central axis of the oil outlet (21).

3. The novel return oil safety valve according to claim 1, characterized in that: A locking element (6) is provided at one end of the valve body (1) near the abutment (2), and the locking element (6) passes through the valve body (1) and abuts against the abutment (2).

4. The novel return oil safety valve according to claim 1, characterized in that: The valve body (1) and the abutment (2) are connected to each other by a threaded connection.

5. The novel return oil safety valve according to claim 1, characterized in that: The valve body (1) is provided with an external hexagonal column (101) and an external thread (102). The external hexagonal column (101) is located near the oil return port (12), and the external thread (102) is located near the oil inlet port (11).

6. The novel oil return safety valve according to claim 1, 2, 3, 4, or 5, characterized in that: The valve needle (4) is a columnar structure and includes a sealing section (41), a liquid passage section (42) and a needle tip section (43). The sealing section (41) is clearance-fitted with the inner side of the valve body (1). The liquid passage section (42) is provided with multiple flat grooves (44), and the flat grooves (44) are left with a gap from the inner side of the valve body (1). The needle tip section (43) extends at least partially into the oil inlet hole (51).

7. The novel return oil safety valve according to claim 6, characterized in that: The needle section (43) is provided with a conical head (45) at one end facing the safety valve plate (5).

8. The novel return oil safety valve according to claim 6, characterized in that: The abutment (2) is also provided with an internal hexagon (22).

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